US2187014A - Antenna transformer - Google Patents
Antenna transformer Download PDFInfo
- Publication number
- US2187014A US2187014A US195480A US19548038A US2187014A US 2187014 A US2187014 A US 2187014A US 195480 A US195480 A US 195480A US 19548038 A US19548038 A US 19548038A US 2187014 A US2187014 A US 2187014A
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- US
- United States
- Prior art keywords
- length
- conductor
- feeder line
- auxiliary conductor
- quarter
- 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 - Lifetime
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- 239000004020 conductor Substances 0.000 description 108
- 230000008878 coupling Effects 0.000 description 9
- 238000010168 coupling process Methods 0.000 description 9
- 238000005859 coupling reaction Methods 0.000 description 9
- 230000009466 transformation Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/04—Coupling devices of the waveguide type with variable factor of coupling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices
Definitions
- 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.
- 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,
- 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.
- 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 V Figure 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.
- 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.
- 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
- 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.
- 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.
- 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.
- 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.
- 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
- 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,
- 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 conductor
- said 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.
Landscapes
- Waveguides (AREA)
Description
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
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE512570X | 1937-03-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2187014A true US2187014A (en) | 1940-01-16 |
Family
ID=6548156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US195480A Expired - Lifetime US2187014A (en) | 1937-03-13 | 1938-03-12 | Antenna transformer |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2187014A (en) |
| GB (1) | GB512570A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2477647A (en) * | 1945-01-29 | 1949-08-02 | Standard Telephones Cables Ltd | Antenna |
| US2490815A (en) * | 1945-01-27 | 1949-12-13 | Standard Telephones Cables Ltd | Loop antenna |
| US2518665A (en) * | 1942-08-22 | 1950-08-15 | Emi Ltd | Connector for high-frequency transmission lines and the like |
| US2530048A (en) * | 1950-11-14 | Unbalanced-to-balanced impedance | ||
| US2597853A (en) * | 1945-01-03 | 1952-05-27 | Us Sec War | Unbalanced to balanced line transformer |
| US2782382A (en) * | 1950-05-25 | 1957-02-19 | Int Standard Electric Corp | Attenuator for surface wave propagation |
| USD249139S (en) * | 1976-09-13 | 1978-08-29 | Fulet Enterprise Co., Ltd. | Matching transformer |
| US4847626A (en) * | 1987-07-01 | 1989-07-11 | Motorola, Inc. | Microstrip balun-antenna |
| EP0426988A1 (en) * | 1989-11-09 | 1991-05-15 | Thomcast Ag | Balun loop |
| US5068672A (en) * | 1989-03-06 | 1991-11-26 | Onnigian Peter K | Balanced antenna feed system |
| US20070257857A1 (en) * | 2003-07-25 | 2007-11-08 | Marino Ronald A | Apparatus for and Method of Using a Diversity Antenna |
-
1938
- 1938-03-12 US US195480A patent/US2187014A/en not_active Expired - Lifetime
- 1938-03-14 GB GB7807/38A patent/GB512570A/en not_active Expired
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2530048A (en) * | 1950-11-14 | Unbalanced-to-balanced impedance | ||
| US2518665A (en) * | 1942-08-22 | 1950-08-15 | Emi Ltd | Connector for high-frequency transmission lines and the like |
| US2597853A (en) * | 1945-01-03 | 1952-05-27 | Us Sec War | Unbalanced to balanced line transformer |
| US2490815A (en) * | 1945-01-27 | 1949-12-13 | Standard Telephones Cables Ltd | Loop antenna |
| US2477647A (en) * | 1945-01-29 | 1949-08-02 | Standard Telephones Cables Ltd | Antenna |
| US2782382A (en) * | 1950-05-25 | 1957-02-19 | Int Standard Electric Corp | Attenuator for surface wave propagation |
| USD249139S (en) * | 1976-09-13 | 1978-08-29 | Fulet Enterprise Co., Ltd. | Matching transformer |
| US4847626A (en) * | 1987-07-01 | 1989-07-11 | Motorola, Inc. | Microstrip balun-antenna |
| US5068672A (en) * | 1989-03-06 | 1991-11-26 | Onnigian Peter K | Balanced antenna feed system |
| EP0426988A1 (en) * | 1989-11-09 | 1991-05-15 | Thomcast Ag | Balun loop |
| US5115214A (en) * | 1989-11-09 | 1992-05-19 | Asea Brown Boveri Ltd. | Balancing loop |
| US20070257857A1 (en) * | 2003-07-25 | 2007-11-08 | Marino Ronald A | Apparatus for and Method of Using a Diversity Antenna |
| US7834816B2 (en) | 2003-07-25 | 2010-11-16 | Sensormatic Electronics Llc | Apparatus for and method of using a diversity antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| GB512570A (en) | 1939-09-20 |
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