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Publication numberUS2569810 A
Publication typeGrant
Publication dateOct 2, 1951
Filing dateApr 2, 1949
Priority dateApr 2, 1949
Publication numberUS 2569810 A, US 2569810A, US-A-2569810, US2569810 A, US2569810A
InventorsBrown Glenn A, Hamel Edward C, Pond Robert F
Original AssigneeTeleflex Antenna Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Folded dipole antenna
US 2569810 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Oct, 2, 1951 E. c. HAMEL. ET AL FOLDED DIPOLE ANTENNA Filed April 2, 1949 and,

Patented Oct. 2, 1951 UNITED STATES PATENT OFFICE FOLDED DIPOLE-ANTENNA Edward C. Hamel, Itasca, Glenn A. Brown, Lombard, and Robert F. Pond; Chicago, Ill., assignors to Teleflex Antenna 00., Chicago, Ill., a corporation of Illinois Application April 2, 1949, Serial No. 85,226

k Claims. 1

The present invention relates to an antenna for thereception or transmission of radio waves, and more particularly to an antenna especially adapted for the reception of television and frequencylmodulated signals.

D'ueto thedifii'culty. in obtaining asatisfactory signal for television or frequency modulated radio receivers without resorting-to elaborate and expensive outdoor antennae, and also because in many-areas such outdoor antennae are not permittedby reason of'various restrictions, many Homes and apartments are without such receivers.

Eurthermorasuch outdoor antennae have been quite-expensive to install and as they require care na of'a' more uniformamplituderesponse over a'widerange of frequencies thanlpossible with prior commercial :types of indoor (antenna, and

which response compares very favorably with the expensive and elaborate outdoor antennae now employed;

Another'important object of the present invention is the provisionof 'a'novel folded 'di -pole antenn'a" havingjan' impedance closely approximating the "input impedance of standard television receivers.- The novel ant'enna'of the present inventionisso designed and "constructed as to pro viderbroadfrequency response, a condition highly desirable forrtheproper reception of television signalsand'notpossessed by any prior type of indoor "or-portable antennae.

The present invention further comprehends the provision of a novel'ante'nnathatmay be dis-. posed closely adjacent thereceiver, requiring, a

minimumiofspace, and one that is quickly and], easily? adjusted for". most. effective reception.

Wherrnotin'use', theinovel antenna forms a com pactass'embly that" maybe collapsed into a small space'and 'mounted on the receiver or many inconspicuous plaoe, butian antenna is instantly available for reception-when the, receiver is to be" operated; By reason ofr'the novel "constructiomk 2 combination and arrangement embodied inthe present antenna, reception of'the standard television receiver is greatly enhanced, a condition not found in prior types of antennae available for indoor use.

The invention furthencomprehen'ds the provision of a novel di-pole antenna comprising. a pair of connected spring-loaded, concave tapes formed ofa substantiallyrigid conducting metal,

and which tapes may be readily adjusted to a de-" sired length for optimum reception of television signals in a prescribed or available channel.

In the preferred embodiment, the novel antenna comprises a paifof coils of conducting material, each coilbeing inthe form of 'a con; caved and semi-rigid, tempered steel tape mount ed in a non-conductinghousing in *such manner that the steel tapes may be uncoiled and with drawn any designated amount for the effective;

reception of signals in'a prescribed or designated channel, and when sowithdrawn forming a folded di-pole antenna. These tapes when folded inf the manner intended, are self-supporting at whatever length is withdrawn from the house ing;

Further objects'are'to provide a construction" of maximum simplicity, efficiency, economy and ease of assembly and operation, and such fur thernbjects, advantages and capabilities as will later more fully appearand are inherently pos-' sessed thereby.

The invention further resides'in the construe tion, combination and arrangement of parts illustrated in the accompanying drawing, and while there is shown therein a preferred embodiment;

it is to be understood that the same is susceptible j of modification and change, and comprehends other details, arrangements of parts, features and constructions without departing from the spirit of the invention;

In the drawing: a

Figure liis a'view in perspective of thenovel antenna. assembly with the tapes retracted to in operative position.

Fig. 2 is another view in perspective of the novel antenna assembly but withthe tapes with drawn to form two angularly arranged and selfsupported antenna elements.

Fig. 3'is anenlarged view in rear elevation of the novel assembly with the rearpanel removed to disclose the interior, one of the antenna elements being shown in retracted position'and the other partially withdrawn, and the casing for one of "the elements or tapes being broken away to show the tape coiled within the casing.

Fig. 4 is a cross-sectional view takenon the irregular line i of Fig. 3, but omitting the tapes and casings. v

Fig. 5 is a view in vertical cross section taken on the irregular line 5--5 of Fig. 3.

Fig. 6 is a fragmentary view in perspective of the inner end of an antenna element or tape.

Fig. 7 is a fragmentary enlarged view in rear elevation of an alternate construction of housin for receiving the tapes.

Referring more particularly to the drawing and to the illustrative embodiment shown in Figs. 1 to 5, inclusive, there is disclosed a housing I formed or molded of a non-conducting material such as a suitable plastic composition having sufficient rigidity, inherent strength and insulating characteristics as to provide a casing for the reception and mounting therein of theantenna.

tected but to which access may be quickly had;

byremoval of a screw or securing means 3 adaptto be received in a threaded boss 4 disposed on the interior of the housing.

The interior of the housing is further provided with opposed arcuate flanges or ledges 5 and 6 each so contoured as to receive and support in fixed position a metallic casing 1 containing an antenna member or element 8. Each antenna member or element 8 comprises a spring-loaded, semi-rigid and concaved conducting tape preferably formed of tempered steel which may be coated or plated with a conducting surface covering.

The outer end 9 of each tape is withdrawn through an opening I in the casing I, and the portion between this end and the portion coiled within the casing is bent back to form a folded di-pole with the antenna members projecting outwardly and upwardly in angular relation and the sections 8 and 8 of the tape disposed in spaced relation. The opposed ends 9 of the two antenna members are joined together by a flexible connection It]. The tape 8 within each casing l is electrically connected to its casing by its sliding contact therewith where the tape emerges, and each casing 1 in turn is electrically joined at H to a conductor or cable A connecting the antenna to thereby transmit the energy intercepted by the antenna to the receiver.

To prevent the outer ends 9 from being withdrawn from the housing I, the extreme ends thereof are formed with a lateral projection l2 that prevents withdrawal of the end of the tape from between a pair of closely spaced, parallel flanges or ribs I 3 and I4 formed upon or carried by an arm 15 freely pivoted at I6 at its inner 7 reduced end. These flanges or ribs are of substantial length and spaced apart just sufficient to receive therebetween the folded, convex, outer end 9 of each tape or antenna and with the adjacent portion of the tape extending outwardly through an elongated notch or slot I! in the opposite side or end walls l8, I8 of the housing i. Due to the pivotal mounting of these arms 15, they move from one extreme position shown at the left of Fig. 3 and in which position an antenna or tape 3 is retracted or withdrawn into its casing 1, to the other extreme position shown at the rightof Fig. 3 and in which position an antenna or tape 8 is in one of its extended or withdrawn positions. When extended to any one of its numerous receptive positions, the folded tape is self-supported and spaced apart to such an extent as to assure most effective operation.

The lower or concaved section 8 of the tape 8 7 hold the tape therebetween in any desired extended position in which the folded end 23 of the tape is spaced at a predetermined distance from the housing I, and the folds or sections 8 and 8 of the tape 8 are in their spaced apart relation. To facilitate accurate adjustment and location of the tapes or antenna members or elements 8 until the desired or prescribed reading appears on the tape as it emerges from the slot 22 in the housing Fig. 7 discloses another form of housing 25 for V receiving the casings 1 containing the antenna members or tapes 8. In this illustrative embodiment, the housing is provided with arcuate.

flanges 26 and 21 for the mounting of the casings i and with the outer, flat projections 28 of each merging with the side or end walls 29 of the housing and disposed in spaced relation with a flange or rib 30 disposed parallel with the end 28'. As in Fig. 3, these flanges or ribs 30 and the. flat projections 28 are spaced apart just enough to receive and permit the tape 8 to slide freely in or out through a slot 3i in the walls 29 of the housing, but at the same time rigidly and eifectively hold the tape in its adjusted position during use.

Rather than provide the pivotal arms I 5 of Fig. 3, the form shown in Fig. '7 provides a pair of diagonally disposed or inclined flanges or ribs 32 and 33, with the space therebetween aligned with a slot 34 in the end walls 29 of thehousing 25. The flanges or ribs 32 and 33 are spaced apart sufficiently to receive and retain the outer end 9 of each tape.

in Fig. 3, the ends 9 of the tapes 8 need not be flexibly connected but may be fixedly joined together in any suitable manner.

From the above description and the disclosure in the drawing, it will be apparent that the present invention comprehends a novel indoor antennaand antenna system for the reception of radio waves, and especially an antenna admirably adapted for the reception of television and frenovel antenna, ,the assembly provides a highly. compact unit that may be easily transported and. during inactive periods Stored in a minimum of As these flanges or ribs are fixed in position and not pivotally mounted as.

as-eszsro mately six inches long, four tofive inciieshigh and havingianfloverallwidth' or thickness of slightly. more than one inch. Thus it will be seen thattli'einactive, assembleda'iitenna may be eas-- il yll stored: or carried" about'l Although'we' have stressed the" use" of the" present antennaas b'e'ing employed-for the receptionoftelevision and F. M. signals, it will be readily appreciated that this novel antenna is equally adapted for the transmission of signals.

Having thus disclosed the invention, we claim:

1. A folded di-pole antenna adapted to be connected to a receiver, comprising a non-conducting housing, a pair of metal casings mounted in the housing, a coiled semi-rigid metallic tape mounted in each casing in such manner that any desired length of tape may be selectively withdrawn or returned to its casing at will, the inner end of each tape being anchored in its casing and its outer end withdrawn and anchored in the housing and forming a fold outside the housing, means for electrically connecting the outer ends of the pair of tapes, and a conductor connected to the casings for transmitting the energy intercepted by the effective length of the antenna to the receiver, the folded portion of the tape being manually withdrawn to any predetermined length for reception of the desired signals.

2. An indoor antenna comprising a housing of non-conducting material having its opposite end walls slotted, a pair of metallic casings secured within the housing in opposed relation and a spring-loaded, semi-rigid, concave metallic tape coiled within and adapted to be withdrawn from each casing or returned thereto, the outer end of each tape being withdrawn from its casing through the slot in the end wall of the housing and with the outer end of the tape returned to and secured in the housing whereby each tape provides an adjustable loop projecting outside the housing and forming a folded di-pole.

3. An adjustable antenna unit comprising a housing of non-conducting material, a pair of metallic casings located within the housing and a coiled metallic tape carried in each casing with the inner end anchored in the casing and the outer end projected through the housing to the exterior and then back into the housing, means for electrically connecting the outer ends together in the housing, and means for anchoring the outer ends in the housing whereby the portion of each tape intermediate the outer end and that portion coiled in the casing provides a folded dipole projecting outside the housing, said folded di-pole being adjustable by withdrawal of a variable length of tape from the casing.

4. An adjustable indoor antenna unit for a receiver comprising a housing of non-conducting material, a pair of metallic casings mounted within the housing in opposed relation, a coiled metallic tape provided in each casing with the outer end of each tape withdrawn from its casing and projecting through the adjacent end of the housing and folded back into the housing with the end of the tape anchored in the housing, whereby to provide a folded di-pole at the two opposite ends of the housing, means for electrically connecting the ends of the tapes in the housing, and a conductor electrically connected at one end to the casings and at its other end to the receiver.

5. In an adjustable indoor antenna for the reception of radio waves, a housing therefor of non-conducting material, a metallic casing enclosed withiif the housing; aunetallic spring loaded; semi=rigid concave tape "coiled within the easingwnfi" itsouterend projecting outside the? casin and means .'for anchoring the outer-ana in th'e'housingwith' the t'ape between said outer end-and the casing being" looped outside the housing an adapted to be withdrawn from the" casing to form a folded di-pole antenna-"- thatis adjustablein length and self sup'port'ed;

(i. Iri'an'indoorantenna" for the reception of television" and frequency modulated" signals, a housing and" support therefor" of non-conductiii'g' material, a sprifig loaded'metallic ta e Cbiled'iilf said-housing withthe outer end ofthe tape ancho'redifiiithe'fhousing'.and said tape forming an adjustable; andTseIf-supporting loop projecting outsidethehousingto provide an adjustable folded di-pole antenna, and means for connecting the ends of the loop to transmit the energy intercepted by the antenna to a receiver.

7. In an antenna unit for radio waves including television and frequency modulated signals, a pair of coiled and extensible metal tapes, a nonconducting housing in which said coiled metal tapes are mounted, and means for electrically connecting and anchoring the outer ends of these tapes within the housing with the portion of each tape between the coil within the housing and the outer end thereof extending outside the housing and thereat forming an extensible loop manually adjustable for the desired signal.

8. In an indoor antenna unit for the reception of television and frequency modulated signals, a pair of coiled and extensible, semi-rigid and concave metal tapes, a non-conducting housing for receiving the coiled portion of the tapes and provided with vertically spaced slots at its opposite ends for the passage therethrough of the spaced sections of each of the tapes as they are withdrawn from the coils, means for connecting together the outer ends of these coils, and means for anchoring the connected ends in the housing, the portion of these tapes between the anchored ends and the coiled portion in the housing forming a self-supporting and extensible loop outside and at each end of the housing and being adjustable to form upwardly and outwardly projecting folded di-poles.

9. An indoor antenna comprising a housing of non-conducting material having its opposite end walls slotted, a pair of metallic casings secured within the housing in opposed relation, a springloaded, semi-rigid, concave metallic tape coiled within and adapted to be withdrawn from each casing or returned thereto, the outer end of each tape being withdrawn from its casing through the slot in the end wall of the housing and with the outer end of the tape returned to and secured in the housing whereby each tape provides an adjustable loop projecting outside the housing and forming a folded di-pole, and spaced flanges for receiving the spaced sections of the folded tapes as they emerge from and enter each end wall of the housing, the flanges being spaced apart just suflicient for the reception and passage of the tapes and of such length as to maintain the tapes in their proper spaced and ad justed relation.

10. An adjustable indoor antenna unit for a receiver comprising a housing of non-conducting material, a pair of metallic casings mounted within the housing in opposed relation, a coiled metallic tape provided in each casing with the outer end of each tape withdrawn from its casing and projecting through the adjacent end of the housing and folded back into the housing with the end of the tape anchored in the housing whereby the extensible loops outside the housing provide a folded di-pole at the two opposite ends of the housing, means for electrically connecting the. ends of the tapes in the housing, spaced elongated flanges for receiving the tapes as they emerge from the opposite ends of the housing, other flanges for receiving the folded and anchored ends of the tapes Within the housing, mean's'for pivotally mounting the last mentioned flanges, and a conductor electrically connected atone end to the casings and at its other end to the receiver.

' EDWARD C. HAMEL.

GLENN A. BROWN. ROBERT F. POND.

Q a: REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,157,278 Blackmore May 9, 1939 2,259,628 Bener Oct. 21, 1941 2333,52; White May 19, 1942 OTHER REFERENCES Tele-Tech, May 1948, page 85.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2157278 *Sep 19, 1938May 9, 1939Blackmore Robert BAutomobile radio aerial
US2259628 *Jun 28, 1941Oct 21, 1941Alfred FenerAdjustable antenna unit
US2283524 *Feb 29, 1940May 19, 1942White Sidney YAdjustable antenna device
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2778017 *Jan 21, 1953Jan 15, 1957Marjo Technical Products CoPortable antenna
US2932822 *Oct 25, 1954Apr 12, 1960Guy Hills ElmerTelevision antenna having adjustable tuning network
US3163863 *Jul 3, 1962Dec 29, 1964Kansai Televi Kogyo K KAdjustable folded dipole
US3290689 *May 11, 1964Dec 6, 1966Packard Bell Electronics CorpAngularly adjustable folded dipole
US3299431 *Feb 10, 1964Jan 17, 1967Hoblin Lester EUnfurlable structure including coiled strips thrust launched upon tension release
US3400402 *Mar 12, 1965Sep 3, 1968Collins Radio CoWire antenna extensible along calibrated support means
US3459391 *Feb 13, 1964Aug 5, 1969NasaInterconnection of solar cells
US4663632 *Jan 28, 1985May 5, 1987Barker Manufacturing Company, Inc.Extendable directional dipole antenna
DE957406C *Feb 6, 1953Jan 31, 1957Siemens AgEinbauantenne fuer ein Funkempfangsgeraet
DE1013335B *Feb 13, 1956Aug 8, 1957Bbc Brown Boveri & CieSymmetrische Schleifenantenne
DE1059058B *Jan 8, 1957Jun 11, 1959Siegfried GeigerVorrichtung zur Aufbewahrung der Anschlussschnur bei Kofferrundfunkempfaengern
DE1277952B *Sep 26, 1962Sep 19, 1968Yoshio FujinoZimmerantenne mit Standfuss
Classifications
U.S. Classification343/803, 343/877, 343/823, 343/809
International ClassificationH01Q9/04, H01Q9/14
Cooperative ClassificationH01Q9/14
European ClassificationH01Q9/14