Feed horn for reflector antennae

• US 4,380,014 A
• Filed: 08/13/1981
• Issued: 04/12/1983
• Est. Priority Date: 08/13/1981
• Status: Expired due to Term

• Current Assignee: Chaparral Communications Incorporated
• Original Assignee: Chaparral Communications Incorporated
• Inventors: Howard, H. Taylor
• Primary Examiner(s): Moore, David K.
• Application Number:
  US06/292,509
• Time in Patent Office: 607 Days
• Field of Search: 343/772-775, 343/786, 343/840
• US Class Current: 343/786
• CPC Class Codes: H01Q 13/0266 provided with a flange or a choke

Abstract

An improved feed horn for use with long f/D reflector antennae comprising an aperture having a plurality of protuberances orthogonally disposed around the periphery thereof, a conical section, a waveguide transition section and an impedance matching section.

Claims

1. An electromagnetic feed horn for use with antenna reflectors in a waveguide transmission system, said feed horn comprising:

an aperture for receiving electromagnetic waves, including a plurality of protuberances symmetrically disposed radially outward along the periphery thereof and orthogonal to the direction of propagation of said waves;

a conical section coupled to the aperture for receiving electromagnetic signals therefrom;

a waveguide mount for mounting the feed horn to the waveguide transmission system;

an impedence matching section coupled to the waveguide mount, for matching the electromagnetic signal impedance of the feed horn to the waveguide system; and

a waveguide transition section for coupling the conical section to the impedance matching section and for converting energy received from the conical section to signals propagating in a waveguide mode.

2. An electromagnetic feed horn as in claim 1 wherein the length of the protuberances are a preselected fraction of the wavelength of the frequency band of interest.

3. An electromagnetic feed horn as in claim 1 wherein the spacing of the protuberances is a preselected fraction of the wavelength of the frequency band of interest.

4. An electromagnetic feed horn as in claim 1 wherein the width of the protuberances is a preselected fraction of the wavelength of the frequency band of interest.

5. An electromagnetic feed horn as in claim 1 wherein the density of the protuberances does not exceed a preselected ratio of protuberance diameter to protuberance spacing.

6. An electromagnetic feed horn as in claim 1 wherein the length of the waveguide transition section is a preselected fraction of the waveguide of the frequency band of interest.