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Publication numberUS2187014 A
Publication typeGrant
Publication dateJan 16, 1940
Filing dateMar 12, 1938
Priority dateMar 13, 1937
Publication numberUS 2187014 A, US 2187014A, US-A-2187014, US2187014 A, US2187014A
InventorsVon Baeyer Hans Jakob Ritter, Werner Buschbeck
Original AssigneeTelefunken Gmbh
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Antenna transformer
US 2187014 A
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Description  (OCR text may contain errors)

I.1111111119411 WBUSC'HBECK ETA.. 2,187,014

A ANTENNATRANSFORMER,

Filed March l2, 1938 INVENTORS WERNE BUSCA/BECK $544452/ ,V0 BAEYER ATTORNEY Patented Jan. 16, 1940 f unirse srarrss PATENT ori-ics ANTENNA TRANSFORMER Germany Application March l2, 1938, Serial No. 195,480 In Germany March 13, 1937 l0 Claims. (Cl. ITS- 44) The present invention involves a simple adapter or matching means mounted in the open air between a symmetrical antenna and a unilaterally grounded cable. p

An object of vthe invention is to provide an antenna matching device of a particularly simple formof construction.

rAnother object is to provide a particularly convenient Wave adjustment for a matching device which allows a water-proof closure of the entire inner structure.

It is feasible to establish a junction or transition from a two-conductor system to a threeconductor system, or viceversa, by the aid of a conductor loop having a length of '/\/4, where X isthe length 'of the operating wave, which is included in a circuit organization as shown in Figure 1. Figure 2 shows an embodiment of the invention, as applied to the structure of Figure l, while Figure 3 shows a modication allowing improved adjustment for matching. In Figure l the conductor loop must have exactly the length of a quarter-wave, for it is only under this condiu tion that the loop asumes the nature of a rejector circuit looking from the signal source. I-Ience,fif an arrangement of this kind is to operate satisfactorily, and if exact tuning is to be insured, it must be made extensible telescope-fashion, and this requirement is likely to meet with serious mechanical difficulties where open-air installations are dealt with, su-ch as in antenna matching transformers, because of the necessity of providing adequate packing to prevent the entrance of moisture, etc.

Now, according tothe present invention the said practical diiiiculty is obviated, as shown in Figure 2, by simply choosing for the loop L a length slightly over M4, while precise tuning is accomplished by the agency of a short-circuiting slide S connected between the outer conductors, the midpoint `of the slide, for the salie of sym*- metry, being at ground potential. inasmuch as the short-circuited part of the loop is Aalso in reference to the slide in a symmetric position,

nothing will be changed so far as the symmetri- V cizing or balancing effect of the whole arrangei vment is concerned.

However, there is the advantage that the Aentire line can be designed in a perfectly water-proof manner; also, in a case where a great number of such devices designed for different waves would be needed such as found in all large-power stations, all waves could be 4covered by a single type of mechanical construction. i v

- If the Adistance between the two conductors Reactance Xp comprises a loop having a length greater than half the lengthl of the operating wave which may be adjusted to the proper length by shorting slide S'. The point of connection of reactance Xp is slidable over the matchingsection M.

If the characteristic .impedance Z2 of the antenna feeder lead is substantially higher than the characteristic impedance Z1 of the cable. it may, under certain circumstances, be advisable `to introduce between the symmetricizing loop and the antenna feeder lead a transformation length equal to M4 having a characteristic impedance 1/ Z1, Z2 u as shown in VFigure 3 and comprising conductors TT. The length of the conductors can be easily adjustedby the aid of sleeves H which are slid` able over the symmetricizing or balancing loop so as to result in the desired free length of the transformation length for the wave used. In the same way, of course, the transformation section may consist of two inter-engaging sleeves so that the shiftable outer sleeve engages over the antenna feed lead having a characteristic impedance Z2.

We claim:

l. A device for coupling together a concentric conductor feeder line having an outer sheath and an inner conductor and a symmetrical load comprising an auxiliary conductor `having one end placed adjacent the end of the feeder line and connected to said inner conductor and having the other end connected to the outer sheath of said feeder line, the length of said auxiliary conductor being greater than a quarter of the length of the longest wave with which the device is to be .opn erated and an adjustable short-circuiting slide connecting said auxiliary conductor and said prisingan auxiliary conductor having one end placed adjacent the end of the feeder line and connected to said inner conductor and having the other end connected to the outer sheath of said feeder line, the length of said auxiliary conductor being greater than a quarter of the length of the longest wave with which the device is to be operated and an adjustable short-circuiting slide connecting said auxiliary conductor and said sheath whereby the length of said auxiliary conductor between said slide and said inner conductor may be adjusted to one-quarter of the length of the operating Wave, said symmetrical load being connected between said sheath and said auxiliary conductor at the end of said feeder line.

3. A device for coupling together a concentric conductor feeder line having an outer sheath and an inner conductor and a symmetrical load comprising an auxiliary conductor having one end placed adjacent the end of the feeder line and connected to said inner conductor and having the other end connected tc the outer sheath of said feeder line and forming an elongated loop, the length of said conductor being greater than a quarter of the length of the longest Wave with which the device is to be operated and an adjustable short-circuiting slide connecting said auxiliary conductor and said sheath whereby the length of said auxiliary conductor between said slide and said inner conductor may be adjusted to one-quarter of the length of the operating wave, said symmetrical load being connected between said sheath and said auxiliary conductor at the end of said feeder line.

4. A device for coupling together a concentric conductor feeder line having an outer sheath and an inner conductor and a symmetrical load comprising an auxiliary conductor having one end placed adjacent the end of the feeder line and connected to said inner conductor and having the other end connected to the outer sheath of said feeder line and forming an elongated loop, the length of said conductor being greater than a quarter of the length of the longest wave with which the device is to be operated and an adjustable short-circuiting slide connecting said auxiliary conductor and said sheath whereby the length of said auxiliary conductor between said slide and said inner conductorl may be adjusted to one-quarter of the length of the operating wave, the outer sheath of said feeder line and said auxiliary conductor being extended beyond the end of said feeder line as a pair of parallel conductors and said symmetrical load being connected to the ends thereof.

5. A device for coupling together a concentric conductor feeder line having an outer sheath and an inner conductor and a symmetrical load comprising an auxiliary conductor having one end placed adjacent the end of the feeder line and connected to said inner conductor and having the other end connected to the outer sheath of said feeder line and forming an elongated loop, the length of said conductor being greater than a quarter of the length of the longest wave with which the device is to be operated and an adjustable short-circuiting slide connecting said auxiliary conductor and said sheath whereby the length of said auxiliary conductor between said slide and said inner conductor may be adjusted to one-quarter of the length of the operating wave, the outer sheath of said feeder line and said auxiliary conductor being extended beyond the end of said feeder line as a pair of parallel conductors, the distance between said parallel conductors being so chosen that the impedance of the symmetrical load is equal to that of the feeder line.

6. A device for coupling together a concentric conductor feeder line having an outer sheath and an inner conductor and a symmetrical load comprising an auxiliary conductor having one end placed adjacent the end of the feeder line and connected to said inner conductor and having the other end connected to the outer sheath of said feeder line and forming an elongated loop, the length of said conductor being greater than a quarter of the length of the longest Wave with which the device is to be operated and an adjustable short-circuiting slide connecting said auxiliary conductor and said sheath whereby the length of said auxiliary conductor between said slide and said inner conductor may be adjusted to one-quarter of the length oi the operating wave, the outer sheath of said feeder line and said auxiliary conductor being extended as a pair of parallel conductors beyond the end of said feeder line a distance at least as great as half the length of the longest wave with which said device is to be operated and said symmetrical load connected to the ends of said parallel conductors.

7. A device for coupling together a concentric conductor feeder line having an outer sheath and an inner conductor and a symmetrical load comprising an auxiliary conductor having one end placed adjacent the end of the feeder line and .e

connected to said inner conductor and having the other end connected to the cuter sheath of said feeder line and forming an elongated loop, the length of said conductor being greater than a quarter of the length of the longest wave with .'1.'

which the device is to be operated and an adjustable short-circuiting slide connecting said auxiliary conductor and said sheath whereby the length of said auxiliary conductor between said slide and said inner conductor may be adjusted to one-quarter of the length of the operating wave, the outer sheath of said feeder line and said auxiliary conductor being extended as a pair of parallel conductors beyond the end of said feeder line a distance at least as great as half the length of the longest wave with which said device is to be operated, said symmetrical load being connected to the ends of said parallel conductors and an adjustable reactance connected across said pair of parallel conductors.

8. A device for coupling together a concentric conductor feeder line having an outer sheath and an inner conductor and a symmetrical load comprising an auxiliary conductor having one end placed adjacent the end of the feeder line and connected to said inner conductor and having the other end connected to the outer sheath of said feeder line and forming an elongated loop, the length of said conductor being greater than a quarter of the length of the longest wave with which the device is to be operated and an adjustable short-circuiting slide connecting said auxiliary conductor and said sheath whereby the length of said auxiliary conductor between said slide and said inner conductor may be adjusted to one-quarter of the length of the operating Wave, the outer sheath oi' said feeder line and said auxiliary conductor being extended as a pair of parallel conductors beyond the end of said feeder line a distance at least as great as half the length of the longest wave with which said device is to be operated, said symmetrical load being connected to the ends of said parallel conductors and an adjustable reactance connected across said pair of parallel conductors, the point of conkan inner conductor and a symmetrical load comy nection of said reactance beingvariable along the length of said conductors.

9. A device for coupling together a concentric conductor feeder line having an outer sheath and an inner conductor and a symmetrical load comprisingan auxiliary conductor having one end placed adjacent the end of the feeder line and able short-circuiting slide connecting said auxiliary conductor and said sheath whereby the length of said auxiliary conductor between said slide and said'inner conductor may be adjusted to one-quarter of the length of the operating wave, the outer sheath of said feeder line and said auX- iliary conductor being extended as a pair of parl allel'conductors beyond the end of said feeder line t a distance at least as great as one-quarter of the length of the longest wave with which the device is to be operated, said symmetrical load being connected to the ends of said parallel conductors, the diameter of said parallel conductors being so I relatedv to the spacing therebetween that the impedance thereof is equal to the geometric mean between the impedance ofthe feeder line and the impedance of Y the loop and means for varying the effective length of said parallel conductors.

10. A device for coupling together a concentric conductor feeder line having an outer sheath and prising an auxiliary conductor having one end placed adjacent the endof the feeder line and `connected `to said innerconductor andhaving. the

other end connected to the outer sheathy of said feeder line and forming an elongated loop, the

length of said conductor being greater than a quarter of the length of the longest wave with which the device is to be operated and an adjustable shortcircuiting slide connecting said auxilslide and said inner conductor may be adjusted f to cne-quarter of the length of the operating Wave, the outer sheath of said feeder line and said auxiliary conductor being extended as a pair of parallel conductors beyond the end of said `feeder line a distance at least as great as onequarter of the length of the longest wave with which the deviceisto be operated; said symmetrical load being connected to the ends of said parallel conductors, the diameter of said parallel conductors being so related to the spacing therebetween that the Iimpedance thereof is kequal to the geometric mean between the impedance of the feeder line and the impedance of the loop and adjustable slides slidable over said sheath and said auxiliary conductor and in contact with said parallel conductors whereby theeiective length of said conductors may be varied.

HANS J AKOB RITTER VON BAEYER. WERNER BUSCHBECK.`

ia-ry conductor andl said .Sheath whereby the t length o-f said auxiliary conductor ybetween saidk

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2477647 *Jan 29, 1945Aug 2, 1949Standard Telephones Cables LtdAntenna
US2490815 *Jan 27, 1945Dec 13, 1949Standard Telephones Cables LtdLoop antenna
US2518665 *Feb 9, 1944Aug 15, 1950Emi LtdConnector for high-frequency transmission lines and the like
US2530048 *Dec 10, 1945Nov 14, 1950 Unbalanced-to-balanced impedance
US2597853 *Jan 3, 1945May 27, 1952Us Sec WarUnbalanced to balanced line transformer
US2782382 *May 25, 1950Feb 19, 1957Int Standard Electric CorpAttenuator for surface wave propagation
US4847626 *Jul 1, 1987Jul 11, 1989Motorola, Inc.Dielectrical material
US5068672 *Mar 6, 1989Nov 26, 1991Onnigian Peter KBalanced antenna feed system
US5115214 *Oct 11, 1990May 19, 1992Asea Brown Boveri Ltd.Balancing loop
US7834816Jul 23, 2004Nov 16, 2010Sensormatic Electronics LlcApparatus for and method of using a diversity antenna
EP0426988A1 *Oct 1, 1990May 15, 1991Thomcast AgBalun loop
Classifications
U.S. Classification333/26, 333/35, 343/864, 343/861, 343/859
International ClassificationH01P5/10, H01P5/04
Cooperative ClassificationH01P5/04, H01P5/10
European ClassificationH01P5/04, H01P5/10