US3060428A - Coaxial cable antenna coupler - Google Patents

Coaxial cable antenna coupler Download PDF

Info

Publication number
US3060428A
US3060428A US732960A US3060428A US 3060428 A US3060428 A US 3060428A US 732960 A US732960 A US 732960A US 3060428 A US3060428 A US 3060428A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
antenna
shield
conductor
end
connected
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
Application number
Inventor
James P Dolan
Original Assignee
James P Dolan
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Grant date

Links

Images

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RLINE CONNECTORS; CURRENT COLLECTORS
    • H01R9/00Connectors and connecting arrangements providing a plurality of mutually insulated connections; Terminals or binding posts mounted upon a base or in a case; Terminal strips; Terminal blocks
    • H01R9/03Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/0503Connection between two cable ends

Description

Oct. 23, 1962 J. P. DOLAN 3,060,428

COAXIAL CABLE ANTENNA COUPLER Filed Feb. s. 19Go JAMES P. DCLAN FIG-...6 INVENTOA United States Patent O 3,060,428 COAXIAL CABLE ANTENNA COUPLER James P. Dolan, 8214 42nd Ave. NE., Seattle, Wash. Filed Feb. 8, 1960, Ser. N0. 7,329 Claims. (Cl. 343-851) This invention relates to an antenna coupler and, more particularly, to an elongated, shielded, conductive connector to be used between a radio transmitter and the associated antenna on land, sea and space vehicles.

The primary object of this invention is to provide improved functioning of short wave radio transmitters under circumstances Where satisfactory grounding or earthing is diicult to attain. Another object lies in the provision of a coupler between a radio transmitter and its antenna which is simply produced, inexpensive, easy to install and use, and which improves radio transmission under conditions where grounding is obtained only with diiculty or with undesirable accompanying side effects, and with improvement in the quality of transmission even with conventional grounding apparatus presently used.

In the following description of the invention and in the accompanying drawings is disclosed a preferred form of apparatus according to this invention. Also, an alternative form of the invention is disclosed. Variations and modiiications of these forms will occur to those skilled in the art and all such that are the equivalent of the invention herein disclosed and that fall within the spirit andv scope of the subjoined claims are to be considered a part of this invention.

In the drawings:

FIG. l is a diagrammatic perspective view of a transmitter coupled to an antenna;

FIG. 2 shows a coupler according to this invention, portions having been broken away or omitted for convenience of illustration;

FIGS. 3, 4 and 5 are cross-sections taken on lines 3 3, 4-4 and 5-5, respectively, of FIG. 2;

FIG. 6 shows-an alternate form of coupler.

Radio transmitter unit 10 is provided with connector posts or terminals A, for an antenna lead, and G for a ,groundl wire. Antenna 12 rises from coil 14 on antenna post 16 which may be supported upright by a mounting plate or base 18, normally attached to the vehicle in which the transmitter is installed.

A coupler, according to this invention, comprises an elongated conductor wire 20 which, by means of a connector lug 22, is attached to the antenna terminal or connector post A of transmitter 10. Conductor 20 extends from the transmitter and terminates without connection in close proximity to antenna mast 16.

A first shield section 24 coaxially surrounds a portion of conductor 20 near the transmitter unit 10. Preferably such a shield is formed of a plurality of Wires woven or braided into cylindrical form about a tubular insulator sleeve 26 which encases or jackets conductor 20 from end to end. An insulated conductor 23 having lug 30 is connected with and extends from that end of shield portion 24 nearest the transmitter 10 for connection to terminal G as shown in FIG. l. Conductor 28 is otherwise unconnected in a conductive sense.

A second shield section 32 also coaxially surrounds another portion of conductor 20. Shield 32 is arranged in end to end spaced apart relation to section 24 as shown in FIG. 2. Shield section 32, likewise formed of woven or braided wires, surrounds .insulator 26 and is spaced thereby about conductor 20. That end of shield section 32 nearest to and spaced from the unconnected outer end of shield section 24 is also unconnected. However, the opposite or remote end of shield 32 is connected to 3,060,428 Patented Oct. 23, 1962 'ice conductor 34 having connector lug 36 thereon for attachment to antenna mast 16.

Preferably the coupler throughout its length is covered by a protective and insulative jacket or casing 38. Insulative caps 40 cover the connections between shields 24 and 32 and the conductors 2S and 34 respectively.

It has been found practical to construct a coupler according to this invention by using a shielded microphone-type coaxial cable known commercially as Belden 8401. In such a cable the axial conductor wire 20 is No. 25 AWG. The shield portion of such a cable from which is formed shields 24 and 32, is a cylinder of braided or woven strands of No. 33 tinned copper wire. The insulator sleeve 26 around conductor 20 and inside shields 24 and 32 is formed of polyethylene material. The jacket 3S is formed of a vinyl compound. Preferably, ends of the wires forming the ends of shields 24 and 32 are unlaid and gathered together to form pigtails in conventional manner and the same are soldered to conductors 28 and 34 respectively. The formation of the two shields 24 and 32 from a cable such as Belden 8401 is easily accomplished by stripping or opening a medial portion of jacket 38. Then, cutting away a portion of the shielding forms the separated but juxtaposed shield sections 24 and 32. It is desirable that a non-conductive jacket 42 be closely secured about the gap for insulative purposes.

Where the unit 10 is of the type rated as a 2 to 3 megacycle transmitter it is desirable that the length of shield 24 be approximately 54 inches long. Shield 32 in such case may be the same length or longer, its length determining the width of the broadcast band desired. Where the unit 10 is rated as 5.5 megacycle transmitter, shield 24 desirably should be about 20 inches in length. In general, the higher the band rating of the transmitter the shorter should be shield 24. Conversely, the lower the band rating of the transmitter the greater the length of shield 24. j It will be seen that the coupler essentially comprises the conductor 20 which is connected to and extends from the antenna connector terminal A into close proximity to the antenna mast 16 to which there is no direct connection of the conductor 20. The conductor is coaXially surrounded by a rst shield 24 and a second shield 32, the same being spaced from each other in end to end but vunconnected relation. An end ofthe irst shield 24 nearest the connected end of conductor 20 is connected to the grounding terminal G of the transmitter unit 10. An end of the second shield 32 nearest the unconnected end of conductor 20 is connected to the antenna mast 16. Suitable insulation 26 separates conductor 20 from the shield sections 24 and 32. The Awhole assembly, when installed, is suitably insulated as by jacket 38 from conductive contact with all extraneous metal or other conductive elements.

An alternative form of coupler, shown in FIG. 6, comprises conductor 50, first shield section 52, second shield 54, and interposed therebetween intermediate shield section 56. Shield 52 as above described is to be connected by lead S3 to the transmitter connector G. Conductor 55 extends between shield 54 and the antenna mast. Shield S6 is unconnected. The coupler of FIG. 6 is suitable for long runs between transmitter and the antenna. The conductor 50 on one end only is connected to terminal A of a transmitter unit 10. Jackets 58 insulate the gaps between shields 52 and 56 and between shields 56 and 54 as described above.

VHaving thus described the invention, what is claimed l. A radio transmission system comprising; a transmitter unit having a ground terminal and an antenna terminal, an antenna; and a coaxial coupling circuit extending between said transmitter unit and said antenna, said coupling circuit comprising; an elongated conductor extending from said antenna terminal to a point adjacent to one end of said antenna, and a first and second coaxial shield in spaced apart end-to-end relation to each other and surrounding portions of said conductor, thereby forming a first and second capacitor connected in series; said first shield connected to the ground terminal and said second shield connected to the antenna, said shields each having a length which is within the range of one fiftieth to one-hundredth of the average wave length of the radio power transmitted.

2. A radio transmission system comprising; a transmitter unit adapted to transmit radio frequency power and having a ground terminal and an antenna terminal; an antenna positioned at a distance from said unit; and a coaxial coupling circuit extending between said transmitter unit and said antenna; said coupling circuit comprising; an elongated conductor extending from said antenna terminal to a point adjacent to one end of said antenna, and a first and second coaxial shield in spaced apart end-to-end relation to each other and surrounding portions of said conductor, thereby forming a first and second capacitor connected in series; said first shield connected only to the ground terminal and said second shield connected only to the antenna, said shields each having a length which is within the range of one-liftieth to one-hundredth of the average wave length of the radio frequency power transmitted by the unit and antenna.

3. A radio transmission system comprising; a transmitter unit adapted to transmit radio frequency power and having a ground terminal and an antenna terminal; an antenna positioned at a distance from said unit; and a coaxial coupling circuit extending between said transmitter unit and said antenna; said coupling circuit cornprising; an elongated conductor extending from said antenna terminal to a point adjacent to one end of said antenna, and a first and second conductive coaxial shield in spaced apart end-to-end relation to each other and surrounding portions of said conductor, said shields being supported on said elongated conductor by solid dielectric insulation material, thereby forming a rst and second capacitor connected in series; said first shield connected only to the ground terminal and said second shield connected only to the antenna, said shields each having a length which is `within the range of one-fiftieth to onehundredth of the average wave length of the radio frequency power transmitted by the unit and antenna.

4. A radio transmission system comprising; a transmitter unit adapted to transmit radio frequency power and having a ground terminal and an antenna terminal, said terminals for connection to a utilization circuit using said power; an antenna positioned at a distance from said unit and including a portion containing a series connected inductor; and a coaxial coupling circuit extending between said transmitter unit and said antenna; said coupling circuit comprising; an elongated conductor extending from said antenna terminal to a point adjacent to one end of said antenna, and a first and second conductive coaxial shield in spaced apart end-to-end relation to each other and surrounding portions of said conductor, said shields being substantially equal in length, said shields being supported on said elongated conductor by solid dielectric insulation material, thereby forming a rst and second capacitor in series; said first shield connected only to the ground terminal and said second shield connected only to the antenna, said shields having a length which is within the range of one-fiftieth to onehundredth of the average wave length of the radio frequency power transmitted by the unit and the antenna.

5. A radio transmission system comprising; a transmitter unit having a ground terminal and an antenna terminal; an antenna; and a coaxial coupling circuit extending between said transmitter unit and said antenna; said coupling circuit comprising; an elongated conductor extending from said antenna terminal to a point adjacent to one end of said antenna, and three coaxial shields in spaced apart end-to-end relation and surrounding portions of said conductor thereby forming three capacitors each having one side connected to said conductor; said first shield connected only to the ground terminal, said second shield connected only to said antenna, said third shield interposed between the first and second shields without contact with either shield or conductor, said shields each having a length which is within the range of one-fiftieth to one-hundredth of the average wave length of the radio power transmitted.

References Cited in the le of this patent UNITED STATES PATENTS 1,744,091 Wrape Jan. 2l, 1930 2,521,550 Smith Sept. 5, 1950 2,569,687 Pan Oct. 2, 1951 2,606,964 Gluyas Aug. 12, 1952 2,628,312 Peterson et al. Feb. 10, 1953 FOREIGN PATENTS 478,343 Germany June 21, 1929 700,559 Germany Dec. 23, 1940 OTHER REFERENCES The A.R.R.L. Antenna Book, published by the American Radio Relay League, 1956 (page 114 relied on).

US3060428A 1960-02-08 1960-02-08 Coaxial cable antenna coupler Expired - Lifetime US3060428A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US3060428A US3060428A (en) 1960-02-08 1960-02-08 Coaxial cable antenna coupler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3060428A US3060428A (en) 1960-02-08 1960-02-08 Coaxial cable antenna coupler

Publications (1)

Publication Number Publication Date
US3060428A true US3060428A (en) 1962-10-23

Family

ID=21725531

Family Applications (1)

Application Number Title Priority Date Filing Date
US3060428A Expired - Lifetime US3060428A (en) 1960-02-08 1960-02-08 Coaxial cable antenna coupler

Country Status (1)

Country Link
US (1) US3060428A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3208702A (en) * 1962-05-08 1965-09-28 Horace N Rowe Antenna support fixture with quick release feature to enable lowering and raising
US4413304A (en) * 1982-02-03 1983-11-01 Gerry Martin E Electromagnetic field compensated cable
US20060236910A1 (en) * 2005-04-20 2006-10-26 Aimar Technology Corporation Masthead control system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE478343C (en) * 1929-06-21 Huth Erich F Gmbh An arrangement for improving the elimination of interference when using more than one antenna
US1744091A (en) * 1922-08-18 1930-01-21 Benwood Linze Company Lead for radio systems
DE700559C (en) * 1939-04-04 1940-12-23 Bosch Gmbh Robert Input circuit for Rundfunkempfaenger
US2521550A (en) * 1946-02-28 1950-09-05 Bell Telephone Labor Inc Radio antenna system
US2569687A (en) * 1948-12-01 1951-10-02 Rca Corp Signal detector circuit
US2606964A (en) * 1948-02-07 1952-08-12 Rca Corp Radio frequency transmission line circuits
US2628312A (en) * 1949-05-24 1953-02-10 Rca Corp Receiving station antenna distribution system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE478343C (en) * 1929-06-21 Huth Erich F Gmbh An arrangement for improving the elimination of interference when using more than one antenna
US1744091A (en) * 1922-08-18 1930-01-21 Benwood Linze Company Lead for radio systems
DE700559C (en) * 1939-04-04 1940-12-23 Bosch Gmbh Robert Input circuit for Rundfunkempfaenger
US2521550A (en) * 1946-02-28 1950-09-05 Bell Telephone Labor Inc Radio antenna system
US2606964A (en) * 1948-02-07 1952-08-12 Rca Corp Radio frequency transmission line circuits
US2569687A (en) * 1948-12-01 1951-10-02 Rca Corp Signal detector circuit
US2628312A (en) * 1949-05-24 1953-02-10 Rca Corp Receiving station antenna distribution system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3208702A (en) * 1962-05-08 1965-09-28 Horace N Rowe Antenna support fixture with quick release feature to enable lowering and raising
US4413304A (en) * 1982-02-03 1983-11-01 Gerry Martin E Electromagnetic field compensated cable
US20060236910A1 (en) * 2005-04-20 2006-10-26 Aimar Technology Corporation Masthead control system
US7739973B2 (en) * 2005-04-20 2010-06-22 Airmar Technology Corporation Masthead control system

Similar Documents

Publication Publication Date Title
US3328510A (en) Combination telephone and co-axial conduit means
US3433687A (en) Method of repairing low-noise transmission cable
Alam et al. Novel surface wave exciters for power line fault detection and communications
US3439111A (en) Shielded cable for high frequency use
US4280129A (en) Variable mutual transductance tuned antenna
US5926149A (en) Coaxial antenna
US3697930A (en) Solderless coaxial connectors
US4406512A (en) Triple row coax cable connector
US4757297A (en) Cable with high frequency suppresion
US6489563B1 (en) Electrical cable with grounding sleeve
US4615578A (en) Mass termination device and connection assembly
US4680423A (en) High performance flat cable
US4772221A (en) Panel mount connector filter assembly
US3816673A (en) Coaxial cable including at least one repeater
US3720874A (en) Dipole antenna arrangement for radio with separate speaker-microphone assembly
US3324417A (en) Shielded common return pairs and coaxial cable
US4487992A (en) Shielded electrical cable
US3297814A (en) Semi-conducting sheath selfsupporting cable
US20050285754A1 (en) Downhole transmission system
US5122068A (en) Cable grounding device
US4649396A (en) Double-tuned blade monopole
US6031185A (en) Method and a device for grounding the shielding braids of shielded cables
US6754060B2 (en) Protective device
US5473117A (en) Flexible cable grounding scheme
US5149915A (en) Hybrid shielded cable