ANTENNA SYSTEM WITH FERRITE RADIATION SUPPRESSORS MOUNTED ON FEED LINE

• US 3,680,146 A
• Filed: 03/02/1970
• Issued: 07/25/1972
• Est. Priority Date: 03/02/1970
• Status: Expired due to Term

• Current Assignee: John E. Drake, Robert T. Leitner
• Original Assignee: John E. Drake, Robert T. Leitner
• Inventors: Leitner, Robert T., Drake, John E.
• Primary Examiner(s): Lieberman, Eli
• Application Number:
  US05/015,612
• Time in Patent Office: 876 Days
• Field of Search: 343/787,790,791,792,885 333/25,12
• US Class Current: 343/792
• CPC Class Codes: H01Q 1/528 reducing the re-radiation of a support structure in a parabolic reflector antenna H01Q19/023

Abstract

A high frequency antenna system comprises an antenna, a transmission line such as a coaxial cable electrically connected to the antenna, and a magnetic member surrounding the outer conductor of the coaxial cable. The magnetic member suppresses extraneous currents that are induced in the outer conductor of the coaxial cable by radiations from the antenna. By suppressing the extraneous current in the outer conductor distortion of radiations is prevented. In the preferred embodiment, the magnetic member comprises a plurality of ferrite toroids which collectively form a cylindrical covering on the conductor. Several antenna systems of this type may be closely spaced in a compact array, and each system may operate independently of the others in the array without interference between antennas.

Claims

1. A high frequency antenna assembly comprising at least first and second coaxially arranged cylindrical antenna elements for independently transmitting electromagnetic waves at respectively different first and second frequencies, means for supporting said first and second antenna elements at axially and relatively closely spaced positions relative to one another, first and second coaxial transmission lines arranged coaxially with said first and second antenna elements and having a center conductor coupled respectively to said first and second antenna elements for respectively supplying energizing current to said first and second antenna elements, at least one of said first and second transmission lines passing through one of said first and second antenna elements to which it is not coupled, and first and second magnetic members each incLuding a plurality of coaxially arranged ferrite toroids surrounding the outer shield of said one of said first and second transmission lines in the space between said first and second elements.

2. The assembly of claim 1, in which at least a first one of said antenna means is adapted to transmit electromagnetic waves in the UHF range and at least a second one of said antenna means is adapted to transmit electromagnetic waves in the VHF range.