Broadband dipole antenna system with coaxial feed-line coated with ferrite particles to reduce line currents

• US 4,218,687 A
• Filed: 10/31/1977
• Issued: 08/19/1980
• Est. Priority Date: 03/19/1976
• Status: Expired due to Term

• Current Assignee: CHU Associates Incorporated (United Capital Corp.)
• Original Assignee: CHU Associates Incorporated (United Capital Corp.)
• Inventors: Faigen, Ivan, Ergene, Ahmet
• Primary Examiner(s): Lieberman, Eli
• Application Number:
  US05/847,070
• Time in Patent Office: 1,023 Days
• Field of Search: 343/787, 343/790, 343/791, 343/792, 343/801, 343/885, 333/12, 333/73 R, 333/79, 333/243
• US Class Current: 343/885
• CPC Class Codes: H01Q 21/10 Collinear arrangements of substantially straight elongated conductive units
• CPC Class Codes: H01Q 5/00 Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements combinations of separate active antenna units operating in different wavebands and connected to a common feeder system H01Q21/30

Abstract

This disclosure deals with a three-element unit array (or stacked groups of the same) that enables the use of very large length-to-diameter dipole elements to cover broad frequency bands, greater than 2:1 in frequency ratio, by novel feed structures exciting the element gaps.

Claims

1. A broadband antenna operable with substantially uniform coverage over a band of frequencies f₁ -f₂, where f₂ :

f₁ is of the order of at least 2;

1, having, in combination, successive in-line antenna elements with gaps defined therebetween; and

coaxial feed-line means disposed along the elements and connected therewith, the outer line thereof being susceptible to induced extraneous currents that reduce the performance of the antenna, at least part of said outer line external to the elements having a continuous absorbing composition formed directly on the outer line by a continuous coating of the same with a dielectric layer containing ferrite particles, the coating having length and thickness dimensions sufficient to reduce substantially said extraneous line currents, so as to permit operation of said antenna with substantially uniform coverage over said band of frequencies.