CA1326699C - Portable radio equipment having a display - Google Patents
Portable radio equipment having a displayInfo
- Publication number
- CA1326699C CA1326699C CA000601745A CA601745A CA1326699C CA 1326699 C CA1326699 C CA 1326699C CA 000601745 A CA000601745 A CA 000601745A CA 601745 A CA601745 A CA 601745A CA 1326699 C CA1326699 C CA 1326699C
- Authority
- CA
- Canada
- Prior art keywords
- antenna
- radio device
- display
- loop antenna
- conductive support
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
Abstract
ABSTRACT OF THE DISCLOSURE
A structure of a loop antenna installed in a portable radio equipment having a display prevents the gain of the antenna from being lowered despite that a conductive support member or frame, which fixes the display in place, is located in close proximity to the antenna. The conductive support member plays the role of an antenna element of the loop antenna.
A structure of a loop antenna installed in a portable radio equipment having a display prevents the gain of the antenna from being lowered despite that a conductive support member or frame, which fixes the display in place, is located in close proximity to the antenna. The conductive support member plays the role of an antenna element of the loop antenna.
Description
3 ~ 9 .
PORTABLE RADIO EQUIPMENT HAYING A DISPLAY
.
..
BACKGROUND OF THE INV~:NTION
,:~ The present inYention relates to portable radio equipment Laving a display and, more particularly, to the structure o~ a loop antenna installed in suc~ portable radio equipment which i, 5 prevents the gain of the antenna from bein~ lowered despite that `~ a conductive support mem~er or frame, which fixes a display in pla~e, is located in close proximity to the antenna.
`/ A modern paging receiver or similar radio equipment having :!~ a display has YariOuS advanced f unctions and has a miniature .~ 1 û handy configuration. The miniature desigll of this kind of equipment is accomplished by arrangillg variotls elements of the .J equipment close to each other in a dense configuration on a printed circuit board. For example, a loop antenna and a support frame for fi~ing an LCD ~Liquid Crystal l~isplaY) or t, 15 ~ similar display element are usually positioned in close proximitY
,~ ~ and in parallel with each other~ In general, a hi~her antenna gain is ~chieYable by atlowing an antenna to occupy as large an area as possible Oll a printed circuit board. Stated another : way, a decrease in ths area which an antenna occupies on a 2 0 printed circuit board invites an increase in loss resistance a~d ;' ' '' .. .
-2- ~32~
,; .
.. ...
... .
,, .
thereby a decrease in antenna gain. On the other hand, the ,~, . . .
support frame is generally made of stainless steel, phosphor , bronze or similar conductive metal. Hence, when the support ,, .
~;' frame and loop antenna are positioned close to each other, a,~ 5 current opposite i~ dlrection to a radiation current ~hich flows through the antenna is induced in the support frame to cancel the ;~ radiation current. This lowers the antenna gain and thereby the sensitivity of the radio equipment. Therefore, when the metal frame is positioned in the vicinity of and in parallel with the antenna, there has to be provided some implementation for preventing the antenna gain from b~ing lowered. The decrease in antenna ~ain would be more aggravated if other structural ^~ elements having influence on the antenna were also located close to the antenna.
i 1 ~
SUMMARY OF THE IN~ENTION
It is therefore an obi~ct of the present invention to provide portable radio equipment having a display which eliminates the decrease in antenna gain ascribable to various structural elements which are located close to an antenna.
~ ~ It is another ob;ect of the present invention to provide -1 ~ portable radio e~ui~ment ha~ring a display which allows a ~:4~
eonductive support member for fixin~ a disPlay element to be positioned in close proximity to an antenna without inviting the 2 5 decrease in antenna gain.
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.. ~ ;.
.': ~,,'' ~' '' '' ~3~99 :
,,.' ~.
70815-8g ~ It is another object of the preæenk invention to provide :
-~ portable radio equipment having a display whlch is implemented by a minimum num~er of structural members and ls therefore miniature.
.,, . It is another object of ~he present invention to provide ganerally improved porta~le radio equipment haviny a display.
In accordance with the prasent inventlon, there is ;~
provided radio device ineluding an electronic element, comprising:
j a ~irst loop antenna, and conduc~ive support means supporting said ~, .
electronic element of said radio device, said conductive support means constituting a second loop antenna connec~ed in serie~ with æald first loop antenna. :~
~RIEF DESCRXPTI0~ OF TH~ DRAWINGS
The above and other objects, ieature and advantages of the present inven~ion will become more apparen~ ~rom the following ¦ detalled description taken with the accompanying drawing~ in whlch-Fig. lA is a perspective view oi a body portion of a ~: prior art paging receiver having a display, ~ casing and a cover : of the paging receiving being o~ikte~ for clarity;
Flg. lB iæ a plan view of the paging receiver body -;~
,3 portlon shown in Fi0. lA;
Fi~. 2 is a view useiul for understanding why the , ~
~ antenna gain is lowered;
~"~
ig. 3 is an exploded pexspective view of a paging ~.`
receiYer having a displ~y embodying ~he presen~ inventlon and ::
which '`: ~ '. :
. : ~ 3 iq;~
. ~ , .
~4- ~ 3 ~
, :.
. ~.
belongs to a family of portable radio equipment;
Fig. 4A is a plan view of a body portion of the paging receiver shown in Fi~. 3;
Fi~. 4B is a front view as seen in a direction YA-VA of 5 Fig. 4A, Fi~. 4C is ia rear view as seen in a direction VB-VB of Fig. 4A;
`~ Fig. 4D is a s;de elevation as seen in a directioll VC-VC of .;
FiR. 4A;
;~ 10 Fi~. 4E is a side eleYation as seen in a direction VD-VD of Fig. 4A; a~d Fig. 5 is a perspective view of an antenna POrtiOn included in the pagin~ receiver of Fig. 3.
DESCRIPTION OF THE PREFE:RRED EMBC)DII~:NT
~¦ To b~tter understand the pr esent lnventioll, prior art : portable radio equipment such as a pa~ing receiYer with a display and why the anten~a gain is lowered when a metal frame , ~ or support member for fixing a display is located close to an -~ 20 antenna will be described with reference to Figso lA, lB alld 2.
Referring to Figs. lA and lB, a ~ody of a prior art paging receiYer 7 0 ineludes a printed circuit boa,rd 12 whi~h is loaded with various structural elemeIIts of the rec~iver 10. Specifically, .~ a power switch 14~ an LCD or similar display 16, a metal frame ~ 25 18, a loudspeaker 20 and an antenna 22 are arrarlged on the "-. ~ .
. .
'J.' ' . ` ', ,. ' ' ., ', ' ~ ' ' , ,` " ` ' ' ' ' ' . '' , .. . '~'.;. :, ' :' ; `. . " ' '; i ': ' :; ', ' . ' ' ' -5~
.
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printed circuit board 12. The frame l 8 is made of stainless steel, phosphor bronze or similar metal and adapted to fix the display 16 in place. A box-like battery holder 24 has terminals 24a and 24b and is located in the vicinity of ths printe~ circuit .~ 5 board 12 to accommo~tlate a battery 26 therein. The antenna 22 ~ is configured as three~turn loop iantenna haYing a~terlna -., elements 22a, 22b and 22c.
5, The display ï 6 is securely retained by the meal frame 18 which in turn is located in close proximit~ to and substantially 10 parallel with the antenna elemeIlts 22a, 22b and 22c of the loop antenna 2~. In sucll an arran~ement, the frame 18 lowers tl~e grain of the antenna ~2 and thereb~ reduces the sensitivity of the receiver 10.
WhY the arrangement shown in Figs. lA and lB lowers the 1~ antenna gain will be discussed specifically with reference to Fig.
2. As shown, when the metal fraLme 18 is positioned close to and i~ parall~l with the ~ntellna elements 22a to 22c, a curren~
Ii is induced in the meal frame 18 by radiation currents Ia, Ib and Ic which flow through the antenna elements 22a, 2Zb and 20 22c, respectivelY. The current Ii is opposite in direction to the eurrents Ia, ~b and Ic as illustrated and, in this sense, generally :~ referred to as a mirror current. The resulting magnetic fluxes , .
-~ and therefor~ the currents cancel each other due to the adjoinin~ ::
antenna elements 22a to 22c and metal frame 18.
In the light of the above, it is a common practice to increase ~-.~ : -"~
- .
', ~.
, '-, .
-6~
the distance between the antenna ~2 and the metal frame lB as far as possible or to arrange the antenna Z2 and metal frame lB
in a non-pararallel position. This imposes restriction on the arrangement of the various structural elements to therebY
obstruct the miniaturization of a paging recelver, while limiting the design freedom with respect to appearance.
Referring to Fig. 3. Portable radio equipment embodying the present invention is shown a~d implemented as a pa~ing receiver b~ way of example. In the figures, similar components or structural elements are designateid by the same reference numerals, and redundant description will be avoided for si~plicity. The paging receiver, geinerally 30, is m~de up of a casing 32, a body 34 and a covler 36. The body 34 of the recei~er 30 is shown in a ~lan view in Fig. 4A and in elevations in Figs. ~B to 4E. Further, an antenna 22 il~cluded in the bodY
34 is shown in a perspective view in Fig. 5. As shown in Fig.
: . 3, the casing 32 is pr~vided wi~h a~ ope~ing or window 38 for dis~lay. The cover 36 is composed of a coYer member 40 and a battery coYer member 42. .
~ 20 T~e bod~? 34 of the receiver 30 will be described in detail ~: with refer~nce to Fi~si. 4A to 4E. The ~ody 34 includes a prlnted circult board 12 on which are mounted a power switch :~ 14, an LCD or similar display 16 for displayin~ a message or similar received information, frames 1 8a and 1 8b made of stainless steel, phosphor bronze or similar metal and adapted to ""', ~':.. '. .. , . . . : , . , , !-:; " : , - .;,", , ; ,; ~ ,:,. .. : ., j, , ., ,~, ` ,: , _7~ ?J~
. ,''' fix the display 16, a loudspeaker 20 for alertin~ a person to an `, incoming call, and a loop antenna 2 2 constituted by antenna i, elements 22A and 22B for efficiently converting an electromagnetic wave into an electrical signal and feeding the 5 electric signal to a high frequency circui~. Losal:ed in the vicinitY
'll of the printed circuit board 12 is a battery holder 24 which accommodates a battery 26 therein and has terminals 24a and 24b for connectin~ the battery 26 to t~e printed circuit board 12. In Figs. 4A and 4B, a radio s~ction is labeled A while a 10 decoder section and a~ LCD drive section which serves as a display are generally label~d B. The radio section amplifies, frequency-conYerts, and demodulates ~ high frequency signal coming in throu~h the a~tenna 2 2, delivering the resulting received si~nal to the decoder secti(>n. In response, t~e decoder 15 section feeds information to be displayed on the LCD drive section .,~ according to the recei~ed signal, and the LCD drive section drives ", ~
`` the LCD 16 to display the information.
;,: . :
-: A~ stated above, the frames 18a and 18b of the illustrativeembodiment ~re made of stainless steel, phosphor bronze or 2 0 similar met 1 to have sufficient mechanical strength and to enhahce dense arrangement o~ various structural elements. The metal frames 18a and 18b not only securely support the LCD 16 but~ also form a part of the anterlna 2 2 themselves. In this ~ ~ sense, each of the metal frames 18a and 18b serves as ~ support - ~ 25 member and antenna element. As shown in Fig. 5, the alltenna ~:-: ~ ' ':
.- ,'.. ,', -8- ~3 -i 22 is connected to the fram~ 18a by the ant~nn~ element 22B, while the frame 1 8a is connected to the frarne 1 8b by a connecting element 18A. The antenna element 22A is connected at one end 22d th0reof to a high frequency amplifying se~tion (not shown) via a matching circuit (not shown). The frame b constituting an antenna eleme~t is connected to ground at 'l one end 18c thereof. Further, reactance elements 44a and 44b are connected in series with the antenna elements, as illustrated.
The reactance elements 44a and 44b cancel the inductance 10 ascribable to the ante~na elemerlts 22A, 22B, 18a, 18A and 18b for thereby promoting conju~ate maLtching with circuitry. In this manner, the antenna elements 22A, 22B, 18a, 18A and 18b and reactance elémentss 44a and 44b form a closed loop, i. e., the loop antenna 22 of the ~aging receiver 30.
In the above configuration, assume that a radiation current ,~ I has flown throu~h the ante~na elernent 22A, as i~dicated by a ,~ solid line in Fig. S. Then, currents Ia and Ib flow respectively in the frame/antenna elements 18a and 18b in the same phase and direction as the radiation current I, as indieated by pharltom 20 lines in the figure. That is, a current opposite in phase to th~
radiation current as shown in Fig. 2 is eliminated.
It is to be noted that the illustratiYe embodiment is applicable not only to a franne for fi~ing a display but also to other various structural elements which are apt to lower the antenna gaill.
-. :
~1 ~ 25 In summary, it will be seen that the Present inYention ':
,~:
9 ~32~
..
provides portable radio equipment with a display which insures a desirable antenna gain because various structural elements are supported by a support member a part of which plays the role of an ante~na element also. To attain a certain antenna gain, the 5 present equipment of the invention reduces the necessary area to bs allocated to an antenna, compared to a prior art loop antenna. Hence, the equipment is miniature and easy to s maintain.
Various modifications will become possible for those skilled in the art after receiving the teachings of the present disclosure wi~hout departing from the scope thereof.
, . . .
-., :, :
- .
',~; ':~ '. ' , . ~
. ~ . .
.., ,, -
PORTABLE RADIO EQUIPMENT HAYING A DISPLAY
.
..
BACKGROUND OF THE INV~:NTION
,:~ The present inYention relates to portable radio equipment Laving a display and, more particularly, to the structure o~ a loop antenna installed in suc~ portable radio equipment which i, 5 prevents the gain of the antenna from bein~ lowered despite that `~ a conductive support mem~er or frame, which fixes a display in pla~e, is located in close proximity to the antenna.
`/ A modern paging receiver or similar radio equipment having :!~ a display has YariOuS advanced f unctions and has a miniature .~ 1 û handy configuration. The miniature desigll of this kind of equipment is accomplished by arrangillg variotls elements of the .J equipment close to each other in a dense configuration on a printed circuit board. For example, a loop antenna and a support frame for fi~ing an LCD ~Liquid Crystal l~isplaY) or t, 15 ~ similar display element are usually positioned in close proximitY
,~ ~ and in parallel with each other~ In general, a hi~her antenna gain is ~chieYable by atlowing an antenna to occupy as large an area as possible Oll a printed circuit board. Stated another : way, a decrease in ths area which an antenna occupies on a 2 0 printed circuit board invites an increase in loss resistance a~d ;' ' '' .. .
-2- ~32~
,; .
.. ...
... .
,, .
thereby a decrease in antenna gain. On the other hand, the ,~, . . .
support frame is generally made of stainless steel, phosphor , bronze or similar conductive metal. Hence, when the support ,, .
~;' frame and loop antenna are positioned close to each other, a,~ 5 current opposite i~ dlrection to a radiation current ~hich flows through the antenna is induced in the support frame to cancel the ;~ radiation current. This lowers the antenna gain and thereby the sensitivity of the radio equipment. Therefore, when the metal frame is positioned in the vicinity of and in parallel with the antenna, there has to be provided some implementation for preventing the antenna gain from b~ing lowered. The decrease in antenna ~ain would be more aggravated if other structural ^~ elements having influence on the antenna were also located close to the antenna.
i 1 ~
SUMMARY OF THE IN~ENTION
It is therefore an obi~ct of the present invention to provide portable radio equipment having a display which eliminates the decrease in antenna gain ascribable to various structural elements which are located close to an antenna.
~ ~ It is another ob;ect of the present invention to provide -1 ~ portable radio e~ui~ment ha~ring a display which allows a ~:4~
eonductive support member for fixin~ a disPlay element to be positioned in close proximity to an antenna without inviting the 2 5 decrease in antenna gain.
~i ..
.. ~ ;.
.': ~,,'' ~' '' '' ~3~99 :
,,.' ~.
70815-8g ~ It is another object of the preæenk invention to provide :
-~ portable radio equipment having a display whlch is implemented by a minimum num~er of structural members and ls therefore miniature.
.,, . It is another object of ~he present invention to provide ganerally improved porta~le radio equipment haviny a display.
In accordance with the prasent inventlon, there is ;~
provided radio device ineluding an electronic element, comprising:
j a ~irst loop antenna, and conduc~ive support means supporting said ~, .
electronic element of said radio device, said conductive support means constituting a second loop antenna connec~ed in serie~ with æald first loop antenna. :~
~RIEF DESCRXPTI0~ OF TH~ DRAWINGS
The above and other objects, ieature and advantages of the present inven~ion will become more apparen~ ~rom the following ¦ detalled description taken with the accompanying drawing~ in whlch-Fig. lA is a perspective view oi a body portion of a ~: prior art paging receiver having a display, ~ casing and a cover : of the paging receiving being o~ikte~ for clarity;
Flg. lB iæ a plan view of the paging receiver body -;~
,3 portlon shown in Fi0. lA;
Fi~. 2 is a view useiul for understanding why the , ~
~ antenna gain is lowered;
~"~
ig. 3 is an exploded pexspective view of a paging ~.`
receiYer having a displ~y embodying ~he presen~ inventlon and ::
which '`: ~ '. :
. : ~ 3 iq;~
. ~ , .
~4- ~ 3 ~
, :.
. ~.
belongs to a family of portable radio equipment;
Fig. 4A is a plan view of a body portion of the paging receiver shown in Fi~. 3;
Fi~. 4B is a front view as seen in a direction YA-VA of 5 Fig. 4A, Fi~. 4C is ia rear view as seen in a direction VB-VB of Fig. 4A;
`~ Fig. 4D is a s;de elevation as seen in a directioll VC-VC of .;
FiR. 4A;
;~ 10 Fi~. 4E is a side eleYation as seen in a direction VD-VD of Fig. 4A; a~d Fig. 5 is a perspective view of an antenna POrtiOn included in the pagin~ receiver of Fig. 3.
DESCRIPTION OF THE PREFE:RRED EMBC)DII~:NT
~¦ To b~tter understand the pr esent lnventioll, prior art : portable radio equipment such as a pa~ing receiYer with a display and why the anten~a gain is lowered when a metal frame , ~ or support member for fixing a display is located close to an -~ 20 antenna will be described with reference to Figso lA, lB alld 2.
Referring to Figs. lA and lB, a ~ody of a prior art paging receiYer 7 0 ineludes a printed circuit boa,rd 12 whi~h is loaded with various structural elemeIIts of the rec~iver 10. Specifically, .~ a power switch 14~ an LCD or similar display 16, a metal frame ~ 25 18, a loudspeaker 20 and an antenna 22 are arrarlged on the "-. ~ .
. .
'J.' ' . ` ', ,. ' ' ., ', ' ~ ' ' , ,` " ` ' ' ' ' ' . '' , .. . '~'.;. :, ' :' ; `. . " ' '; i ': ' :; ', ' . ' ' ' -5~
.
,, : .
printed circuit board 12. The frame l 8 is made of stainless steel, phosphor bronze or similar metal and adapted to fix the display 16 in place. A box-like battery holder 24 has terminals 24a and 24b and is located in the vicinity of ths printe~ circuit .~ 5 board 12 to accommo~tlate a battery 26 therein. The antenna 22 ~ is configured as three~turn loop iantenna haYing a~terlna -., elements 22a, 22b and 22c.
5, The display ï 6 is securely retained by the meal frame 18 which in turn is located in close proximit~ to and substantially 10 parallel with the antenna elemeIlts 22a, 22b and 22c of the loop antenna 2~. In sucll an arran~ement, the frame 18 lowers tl~e grain of the antenna ~2 and thereb~ reduces the sensitivity of the receiver 10.
WhY the arrangement shown in Figs. lA and lB lowers the 1~ antenna gain will be discussed specifically with reference to Fig.
2. As shown, when the metal fraLme 18 is positioned close to and i~ parall~l with the ~ntellna elements 22a to 22c, a curren~
Ii is induced in the meal frame 18 by radiation currents Ia, Ib and Ic which flow through the antenna elements 22a, 2Zb and 20 22c, respectivelY. The current Ii is opposite in direction to the eurrents Ia, ~b and Ic as illustrated and, in this sense, generally :~ referred to as a mirror current. The resulting magnetic fluxes , .
-~ and therefor~ the currents cancel each other due to the adjoinin~ ::
antenna elements 22a to 22c and metal frame 18.
In the light of the above, it is a common practice to increase ~-.~ : -"~
- .
', ~.
, '-, .
-6~
the distance between the antenna ~2 and the metal frame lB as far as possible or to arrange the antenna Z2 and metal frame lB
in a non-pararallel position. This imposes restriction on the arrangement of the various structural elements to therebY
obstruct the miniaturization of a paging recelver, while limiting the design freedom with respect to appearance.
Referring to Fig. 3. Portable radio equipment embodying the present invention is shown a~d implemented as a pa~ing receiver b~ way of example. In the figures, similar components or structural elements are designateid by the same reference numerals, and redundant description will be avoided for si~plicity. The paging receiver, geinerally 30, is m~de up of a casing 32, a body 34 and a covler 36. The body 34 of the recei~er 30 is shown in a ~lan view in Fig. 4A and in elevations in Figs. ~B to 4E. Further, an antenna 22 il~cluded in the bodY
34 is shown in a perspective view in Fig. 5. As shown in Fig.
: . 3, the casing 32 is pr~vided wi~h a~ ope~ing or window 38 for dis~lay. The cover 36 is composed of a coYer member 40 and a battery coYer member 42. .
~ 20 T~e bod~? 34 of the receiver 30 will be described in detail ~: with refer~nce to Fi~si. 4A to 4E. The ~ody 34 includes a prlnted circult board 12 on which are mounted a power switch :~ 14, an LCD or similar display 16 for displayin~ a message or similar received information, frames 1 8a and 1 8b made of stainless steel, phosphor bronze or similar metal and adapted to ""', ~':.. '. .. , . . . : , . , , !-:; " : , - .;,", , ; ,; ~ ,:,. .. : ., j, , ., ,~, ` ,: , _7~ ?J~
. ,''' fix the display 16, a loudspeaker 20 for alertin~ a person to an `, incoming call, and a loop antenna 2 2 constituted by antenna i, elements 22A and 22B for efficiently converting an electromagnetic wave into an electrical signal and feeding the 5 electric signal to a high frequency circui~. Losal:ed in the vicinitY
'll of the printed circuit board 12 is a battery holder 24 which accommodates a battery 26 therein and has terminals 24a and 24b for connectin~ the battery 26 to t~e printed circuit board 12. In Figs. 4A and 4B, a radio s~ction is labeled A while a 10 decoder section and a~ LCD drive section which serves as a display are generally label~d B. The radio section amplifies, frequency-conYerts, and demodulates ~ high frequency signal coming in throu~h the a~tenna 2 2, delivering the resulting received si~nal to the decoder secti(>n. In response, t~e decoder 15 section feeds information to be displayed on the LCD drive section .,~ according to the recei~ed signal, and the LCD drive section drives ", ~
`` the LCD 16 to display the information.
;,: . :
-: A~ stated above, the frames 18a and 18b of the illustrativeembodiment ~re made of stainless steel, phosphor bronze or 2 0 similar met 1 to have sufficient mechanical strength and to enhahce dense arrangement o~ various structural elements. The metal frames 18a and 18b not only securely support the LCD 16 but~ also form a part of the anterlna 2 2 themselves. In this ~ ~ sense, each of the metal frames 18a and 18b serves as ~ support - ~ 25 member and antenna element. As shown in Fig. 5, the alltenna ~:-: ~ ' ':
.- ,'.. ,', -8- ~3 -i 22 is connected to the fram~ 18a by the ant~nn~ element 22B, while the frame 1 8a is connected to the frarne 1 8b by a connecting element 18A. The antenna element 22A is connected at one end 22d th0reof to a high frequency amplifying se~tion (not shown) via a matching circuit (not shown). The frame b constituting an antenna eleme~t is connected to ground at 'l one end 18c thereof. Further, reactance elements 44a and 44b are connected in series with the antenna elements, as illustrated.
The reactance elements 44a and 44b cancel the inductance 10 ascribable to the ante~na elemerlts 22A, 22B, 18a, 18A and 18b for thereby promoting conju~ate maLtching with circuitry. In this manner, the antenna elements 22A, 22B, 18a, 18A and 18b and reactance elémentss 44a and 44b form a closed loop, i. e., the loop antenna 22 of the ~aging receiver 30.
In the above configuration, assume that a radiation current ,~ I has flown throu~h the ante~na elernent 22A, as i~dicated by a ,~ solid line in Fig. S. Then, currents Ia and Ib flow respectively in the frame/antenna elements 18a and 18b in the same phase and direction as the radiation current I, as indieated by pharltom 20 lines in the figure. That is, a current opposite in phase to th~
radiation current as shown in Fig. 2 is eliminated.
It is to be noted that the illustratiYe embodiment is applicable not only to a franne for fi~ing a display but also to other various structural elements which are apt to lower the antenna gaill.
-. :
~1 ~ 25 In summary, it will be seen that the Present inYention ':
,~:
9 ~32~
..
provides portable radio equipment with a display which insures a desirable antenna gain because various structural elements are supported by a support member a part of which plays the role of an ante~na element also. To attain a certain antenna gain, the 5 present equipment of the invention reduces the necessary area to bs allocated to an antenna, compared to a prior art loop antenna. Hence, the equipment is miniature and easy to s maintain.
Various modifications will become possible for those skilled in the art after receiving the teachings of the present disclosure wi~hout departing from the scope thereof.
, . . .
-., :, :
- .
',~; ':~ '. ' , . ~
. ~ . .
.., ,, -
Claims (7)
1. Radio device including an electronic element, comprising: a first loop antenna, and conductive support means supporting said electronic element of said radio device, said conductive support means constituting a second loop antenna connected in series with said first loop antenna.
2. Radio device as claimed in claim 1, wherein said first loop antenna comprises a first and a second antenna element constituted by metal members and individually mounted on opposite major surfaces of a printed circuit board of said radio device.
3. Radio device as claimed in claim 2, wherein said conductive support means comprises at least two metal frames mounted on one of the opposite major surfaces of said printed circuit board, and a connecting member made of metal and mounted on the other major surface of said printed circuit board for connecting said two metal frames to each other to constitute said second loop antenna.
4. Radio device as claimed in claim 3, wherein said two metal frames constitute respectively a third and a fourth antenna element while said connecting member constitutes a fifth antenna element.
5. Radio device as claimed in claim 4, further comprising at least one reactance element connected in series with said first to fifth antenna elements, said first to fifth antenna elements and said reactance element.
6. Radio device as claimed in claim 6, wherein said conductive support means comprises a frame of a display.
7. Radio device as claimed in claim 6, wherein said radio device comprises a paying receiver.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63138635A JPH01307302A (en) | 1988-06-06 | 1988-06-06 | Loop antenna for portable radio equipment |
| JP63-138635 | 1988-06-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1326699C true CA1326699C (en) | 1994-02-01 |
Family
ID=15226654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000601745A Expired - Fee Related CA1326699C (en) | 1988-06-06 | 1989-06-05 | Portable radio equipment having a display |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5408699A (en) |
| JP (1) | JPH01307302A (en) |
| AU (1) | AU632485B2 (en) |
| CA (1) | CA1326699C (en) |
| GB (1) | GB2219454B (en) |
| HK (1) | HK101593A (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2806525B2 (en) * | 1988-03-04 | 1998-09-30 | 日本電気株式会社 | Receiver with display function |
| US5673054A (en) * | 1991-05-09 | 1997-09-30 | Seiko Epson Corporation | Antenna and miniature portable wireless transceiver |
| JP3397366B2 (en) * | 1993-03-19 | 2003-04-14 | キヤノン株式会社 | Imaging device |
| US5668560A (en) * | 1995-01-30 | 1997-09-16 | Ncr Corporation | Wireless electronic module |
| JP2723838B2 (en) * | 1995-06-20 | 1998-03-09 | 静岡日本電気株式会社 | Radio selective call receiver |
| US6223019B1 (en) | 1996-03-14 | 2001-04-24 | Sirius Satellite Radio Inc. | Efficient high latitude service area satellite mobile broadcasting systems |
| DE29620127U1 (en) * | 1996-11-19 | 1997-03-20 | Siemens Ag | Contacting an antenna arranged within a mobile part of a communication terminal |
| US5794138A (en) * | 1997-02-26 | 1998-08-11 | Cd Radio Inc. | Satellite broadcast system receiver |
| US6023616A (en) * | 1998-03-10 | 2000-02-08 | Cd Radio Inc. | Satellite broadcast receiver system |
| SE9804498D0 (en) * | 1998-04-02 | 1998-12-22 | Allgon Ab | Wide band antenna means incorporating a radiating structure having a band shape |
| US7065379B1 (en) * | 1999-07-02 | 2006-06-20 | Samsung Electronics Co., Ltd. | Portable radio terminal equipment having conductor for preventing radiation loss |
| US6546445B1 (en) | 2000-01-13 | 2003-04-08 | Dell Usa, L.P. | Method and system for connecting dual storage interfaces |
| WO2003107473A2 (en) * | 2002-06-01 | 2003-12-24 | Sony Ericsson Mobile Communications Ab | Wideband antenna device |
| JP4096975B2 (en) * | 2003-12-18 | 2008-06-04 | 三菱電機株式会社 | Portable radio |
| DE102005011454B4 (en) * | 2004-03-18 | 2007-01-04 | Loewe Opta Gmbh | TV receiver with integrated antenna |
| KR100740083B1 (en) * | 2004-11-24 | 2007-07-16 | 삼성전자주식회사 | Built-in antenna for protable wireless terminal |
| US7773041B2 (en) * | 2006-07-12 | 2010-08-10 | Apple Inc. | Antenna system |
| US7933123B2 (en) | 2008-04-11 | 2011-04-26 | Apple Inc. | Portable electronic device with two-piece housing |
| DE102015115574A1 (en) * | 2014-11-13 | 2016-05-19 | Samsung Electronics Co., Ltd. | Near field communication chip embedded in a portable electronic device and portable electronic device |
| KR102443196B1 (en) | 2015-09-25 | 2022-09-15 | 삼성전자주식회사 | Electronic device |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2388567A (en) * | 1943-01-28 | 1945-11-06 | Philco Radio & Television Corp | Portable radio receiver |
| GB668306A (en) * | 1948-03-04 | 1952-03-12 | Philco Corp | Improvements in radio apparatus |
| GB688306A (en) * | 1950-08-15 | 1953-03-04 | Pilkington Brothers Ltd | Improvements in or relating to glass ventilators |
| GB944039A (en) * | 1959-02-21 | 1963-12-11 | Philips Electrical Ind Ltd | Improvements in or relating to supporting plates for printed circuits |
| US3736591A (en) * | 1970-10-30 | 1973-05-29 | Motorola Inc | Receiving antenna for miniature radio receiver |
| GB1354719A (en) * | 1971-10-13 | 1974-06-05 | Stadium Ltd | Chin cups for helmets |
| JPS56160585A (en) * | 1980-05-13 | 1981-12-10 | Komatsu Electron Kk | Heat exchanging method |
| US4642627A (en) * | 1984-03-13 | 1987-02-10 | General Electric Company | Illuminated compact control surface |
| JPS6187434A (en) * | 1984-10-04 | 1986-05-02 | Nec Corp | Portable radio equipment |
| CA1249052A (en) * | 1984-11-08 | 1989-01-17 | Junzo Ohe | Automobile antenna system |
| US4648125A (en) * | 1986-01-03 | 1987-03-03 | Motorola, Inc. | Portable radio transceiver |
| US4937586A (en) * | 1986-09-22 | 1990-06-26 | Stevens John K | Radio broadcast communication systems with multiple loop antennas |
| US4814776A (en) * | 1987-09-10 | 1989-03-21 | Motorola, Inc. | Optimally grounded small loop antenna |
| FI88438C (en) * | 1987-09-25 | 1993-05-10 | Siemens Ag | ELECTROMAGNETIC COUPLING |
| US4894663A (en) * | 1987-11-16 | 1990-01-16 | Motorola, Inc. | Ultra thin radio housing with integral antenna |
| JPH01241927A (en) * | 1988-03-24 | 1989-09-26 | Kokusai Electric Co Ltd | Receiver for radio calling |
| US5048118A (en) * | 1989-07-10 | 1991-09-10 | Motorola, Inc. | Combination dual loop antenna and bezel with detachable lens cap |
-
1988
- 1988-06-06 JP JP63138635A patent/JPH01307302A/en active Pending
-
1989
- 1989-06-02 GB GB8912736A patent/GB2219454B/en not_active Expired - Fee Related
- 1989-06-05 CA CA000601745A patent/CA1326699C/en not_active Expired - Fee Related
- 1989-06-05 AU AU36034/89A patent/AU632485B2/en not_active Ceased
-
1991
- 1991-10-15 US US02/777,491 patent/US5408699A/en not_active Expired - Fee Related
-
1993
- 1993-09-30 HK HK1015/93A patent/HK101593A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| AU632485B2 (en) | 1993-01-07 |
| AU3603489A (en) | 1989-12-07 |
| JPH01307302A (en) | 1989-12-12 |
| GB2219454A (en) | 1989-12-06 |
| GB2219454B (en) | 1992-11-18 |
| HK101593A (en) | 1993-10-08 |
| GB8912736D0 (en) | 1989-07-19 |
| US5408699A (en) | 1995-04-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |