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CA1201199A Expired / Lapsed CA ⏱️ 0.0 years remaining

Dielectric rod feed for reflector antennas

Assignee: Individual
•
Filing: 1983-05-26
•
Granted: 1986-02-25
•
Expires: 2003-05-26
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Abstract

Abstract TITLE A DIELECTRIC ROD FEED FOR REFLECTOR ANTENNAS INVENTORS Lotfollah Shafai Apisak Ittipiboon Ernest Bridges ABSTRACT OF THE DISCLOSURE The feed which may be designed for operation in a single or dual bandwidth within a broad frequency range extending from a fraction of a GHz to many GHz, up to and including the range of 8 to 13 GHz. The feed includes a circular waveguide wherein one end is fitted with an electrical coupler and the other end acts as the radiator. A cylindrical dielectric rod is located within the radiating end of the waveguide and extends out of the guide to a length L which is less than .lambda.c/2 where .lambda. is the wavelength at the midband of the operating frequency. The diame-ter D of the dielectric rod may be equal to the inside of the waveguide, and is less than .lambda.o/.epsilon.r , where .lambda.o is the wavelength of the highest op-erating frequency of the feed and .epsilon.r is the relative dielectric constant of the dielectric rod.

Inventors

  • 👤 Lotfollah Shafai
  • 👤 Apisak Ittipiboon
  • 👤 Ernest Bridges

Bibliographic Details

Application Number —
Jurisdiction CA
Data Source google_patents
Last Synchronized 2026-11-04 15:54
CPC Classifications
—

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 116 words
A feed for a paraboloid antenna for operation at one frequency with substantially equal E and H plane patterns comprising: - a circular waveguide with a first end having an electrical coupler, a second radiating end; and an inner diameter D; and - a cylindrical dielectric rod located within the radiating end of the waveguide and extending outward thereof to a length L, L being less than .lambda.c/2 where .lambda.c is the wavelength at the midband of the operating frequency, the dielectric rod having a diameter substantially equal to D, D being less than .lambda.o/.epsilon.r, where .lambda.o is the wavelength of the highest operating frequency and .epsilon.r is the relative dielectric constant of the dielectric rod.
Claim 2
Dependent Claim 116 words
A feed for a paraboloid antenna for operation at one frequency with substantially equal E and H plane patterns comprising: - a circular waveguide with a first end having an electrical coupler, a second radiating end; and an inner diameter D; and - a cylindrical dielectric rod located within the radiating end of the waveguide and extending outward thereof to a length L, L being less than .lambda.c/2 where .lambda.c is the wavelength at the midband of the operating frequency, the dielectric rod having a diameter substantially equal to D, D being less than .lambda.o/.epsilon.r, where .lambda.o is the wavelength of the highest operating frequency and .epsilon.r is the relative dielectric constant of the dielectric rod.
Claim 3
Dependent Claim 18 words
A feed as claimed in claim 1 wherein the operating frequency is in the range of 8-13 GHz.
Claim 4
Dependent Claim 36 words
A feed as claimed in claim 1 or 2 wherein the dielectric constant .epsilon.r is approximately 2.54, the diameter D of the dielectric rod is approximately 1.5 cm and the length L is approximately 1.0 cm.

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