US 6,208,309 B1 · Dual depth aperture chokes for dual frequency horn equalizing E and H-plane patterns

Abstract

A horn antenna is provided which is capable of operating at a plurality of separate frequencies while providing substantially equalized E and H-plane patterns for each of the separate frequencies. The antenna includes a coupling portion to permit coupling to a communication device. An inner portion is coupled to the coupling portion, and includes a first choke having a depth which extends substantially parallel to a central longitudinal axis of the antenna and a width which extends in a radial direction of the antenna. The depth and the width of the first choke are set so that the first choke will operate at the first frequency. An outer portion is coupled to the inner portion, wherein the outer portion has a maximum diameter in the radial direction which is greater than the maximum diameter in the radial direction of the inner portion. The outer portion includes a second choke which also has a depth to extend substantially parallel to the central longitudinal axis of the antenna, and a width which extends in the radial direction. The depth and the width of the second choke are greater than the depth and the width of the first choke, and are set so that the second choke will operate at the second frequency. By virtue of the fact that the depths of the chokes extend in a direction substantially parallel to the longitudinal axis of the horn, the maximum electrical aperture of the antenna can be very close in size to the maximum physical diameter.

Claims46

Dependent claims

A horn antenna for operating in a plurality of separate frequency bands comprising:

a coupling portion to permit coupling of the horn antenna to a communication device;
an inner portion coupled to the coupling portion, including a plurality of first chokes operating in a first frequency band, wherein depths of the first chokes extends substantially parallel to a central longitudinal axis of the antenna and widths of the first chokes extend in a radial direction of the antenna;
and
an outer portion coupled to the inner portion and having a maximum diameter in the radial direction which is greater than a maximum diameter in the radial direction of the inner portion, the outer portion comprising a plurality of second chokes operating in a second frequency band different than the first frequency band having depths which extend substantially parallel to the central longitudinal axis of the antenna and widths which extend in the radial direction, wherein the depths and the widths of the second chokes are greater than the depths and the widths of the first choke.

1 more element

A horn antenna for operating in at least first and second frequency bands which are separate from one another and for providing substantially equalized E and H plane patterns for the first and second frequency bands, comprising:

means for providing electromagnetic waves in the first and second frequency bands to the horn antenna, wherein the first frequency band is higher in frequency than the second frequency band;
an inner portion, having a minimum diameter and a maximum diameter, for operating in the first frequency band, comprising a plurality of first chokes coupled to one another to extend between the minimum diameter and the maximum diameter, wherein the depths of the first chokes extend substantially parallel to a central longitudinal axis of the antenna and the widths of the first chokes extend in a radial direction of the antenna, wherein the depths and the widths of the first chokes increase for each of the first chokes between the minimum diameter and the maximum diameter to provide different center frequencies for each of the first chokes within the first frequency band;
and
an outer portion, having a minimum diameter and a maximum diameter, for operating in the second frequency band, wherein the point of minimum diameter for the outer portion is coupled to the point of maximum diameter for the inner portion, said outer portion comprising a plurality of second chokes coupled to one another between the minimum diameter of the outer portion and the maximum diameter of the outer portion, wherein the second chokes have depths which extend substantially parallel to the central longitudinal axis of the antenna and widths which extend in the radial direction, wherein the depths and the widths of the second choke are greater than the depths and the widths of the first chokes, and wherein the depths and the widths of the second chokes increase for each of the second chokes between the minimum diameter and the outer diameter of the outer portion to provide different center frequencies for each of the second chokes within the second frequency band,
wherein the depths and the widths of the first and second chokes provide substantially equalized E and H plane patterns for the first frequency band and substantially equalized E and H plane patterns for the second frequency band.

2 more elements

Dependencies are inferred from the claim text.

Dual depth aperture chokes for dual frequency horn equalizing E and H-plane patterns

Life of this patent

Dual depth aperture chokes for dual frequency horn equalizing E and H-plane patterns

Life of this patent

Abstract

Claims46