Plural antennas on common support with feed line isolation

• US 3,999,185 A
• Filed: 12/23/1975
• Issued: 12/21/1976
• Est. Priority Date: 12/23/1975
• Status: Expired due to Term

• Current Assignee: ITT Corporation (ITT, Inc.)
• Original Assignee: International Telephone and Telegraph Corporation
• Inventors: Majkrzak, Charles Peter, Polgar, Michael Stephen Jr.
• Primary Examiner(s): Lieberman, Eli
• Application Number:
  US05/643,882
• Time in Patent Office: 364 Days
• Field of Search: 343/709, 343/885, 343/895, 343/787, 343/788
• US Class Current: 343/709
• CPC Class Codes: H01Q 1/04 Adaptation for subterranean or subaqueous use
• CPC Class Codes: H01Q 1/34 Adaptation for use in or on ships, submarines, buoys or torpedoes for subaqueous use H01Q1/04
• CPC Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 5/40 Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements

Abstract

The structure includes a tunable high power MF/HF transmitting antenna having a vertical axis and a shorting assembly driven along the vertical axis to tune the high power antenna. A hollow rotating drive shaft is disposed coaxially of the vertical axis within and coupled to the shorting assembly to drive the shorting assembly. A plurality of additional antennas are disposed in a vertical stacked arrangment above the high power antenna. A plurality of service conductors each coupled to a different one of the plurality of additional antennas are enclosed in a conduit disposed coaxially of the vertical axis and within the drive shaft. A tunable ferrite isolator is disposed below the drive shaft and includes the conduit to enable the conduit and the service conductors to pass through the high power antenna with a minimum of modification to the performance of the high power antenna.

Claims

1. A single multipurpose antenna structure comprising:

a tunable high power medium frequency/high frequency transmitting antenna having a vertical axis and a shorting assembly driven along said vertical axis to tune said high power antenna;

a hollow drive shaft disposed coaxial of said axis within and coupled to said shorting assembly to drive said shorting assembly;

means coupled to said drive shaft to rotate said drive shaft;

a plurality of additional antennas disposed in a vertical stacked arrangement above said high power antenna;

a plurality of service conductors each coupled to a different one of said plurality of additional antennas;

a conduit enclosing said service conductors disposed coaxial of said axis and within said drive shaft; and

a tunable ferrite isolator disposed below said drive shaft including said conduit to enable said conduit and said service conductors to pass through said high power antenna with a minimum of modification to the performance of said high power antenna.

2. A structure according to claim 1, wherein

said high power antenna further includes

an inductive helix disposed coaxial of said axis and outside said shorting assembly, said shorting assembly having the lower end thereof traveling on and shorting said helix;

and

a capacitive cylinder disposed coaxial of said axis above said helix, the inner surface of said cylinder being shorted by said shorting assembly and providing a support and guiding surface for the upper end of said shorting assembly.

3. A structure according to claim 2, wherein

said isolator includes

a plurality of ferrite cores stacked one above the other to form a hollow ferrite cylinder,

said conduit being passsed through said ferrite cylinder to form at least a two-turn inductor, and

a tunable vacuum capacitor coupled to said conduit between said ferrite cylinder and said drive shaft to tune said isolator.

4. A structure according to claim 3, wherein

said means includes

a gear train coupled to an end of said drive shaft adjacent to said isolator, and

a motor coupled to said gear train.

5. A structure according to claim 4, further including

a hydrodynamically shaped radome enclosing said structure for utilization on a submarine.

6. A structure according to claim 1, wherein

said isolator includes

a plurality of ferrite cores stacked one above the other to form a hollow ferrite cylinder,

said conduit being passed through said ferrite cylinder to form at least a two-turn inductor, and

a tunable vacuum capacitor coupled to said conduit between said ferrite cylinder and said drive shaft to tune said isolator.

7. A structure according to claim 6, wherein

said means includes

a gear train coupled to an end of said drive shaft adjacent to said isolator, and

a motor coupled to said gear train.

8. A structure according to claim 7, further including

a hydrodynamically shaped radome enclosing said structure for utilization on a submarine.

9. A structure according to claim 1, wherein

said means includes

a gear train coupled to an end of said drive shaft adjacent to said isolator, and

a motor coupled to said gear train.

10. A structure according to claim 9, further including

a hydrodynamically shaped radome enclosing said structure for utilization on a submarine.

11. A structure according to claim 1, further including

a hydrodynamically shaped radome enclosing said structure for utilization on a submarine.