Broadband antenna feed array

摘要

A microwave antenna suitable for monopulse radar applications is operable over a broad frequency band. The antenna uses a horn with two walls. Each wall includes two ridges that extend into an inner region of the horn near the horn's base and then taper into the wall surfaces. The horn is coupled to two ridged waveguide sections with the ridges of the waveguide sections matched to opposed pairs of the horn ridges. The antenna may be coupled to electronics via standard waveguides. In many embodiments, dimensions of the waveguides coupled to the horn are smaller (to provide a small array spacing) than dimensions of the standard waveguides with a tapered waveguide section providing a transition. In one embodiment, the antenna operates with frequencies from 5.25 to 10.5 GHz.

主权项

1. A broadband antenna comprising:
a body comprising:
a first waveguide path having a rectangular cross-section including a first longer wall and a second longer wall with a first ridge extending inward from the first longer wall and a second ridge extending inward from the second longer wall, the first waveguide path arranged for coupling electromagnetic signals to electronics at a first end and arranged for coupling to radiating signals at a second end; anda second waveguide path having a rectangular cross-section including a first longer wall and a second longer wall with a first ridge extending inward from the first longer wall and a second ridge extending inward from the second longer wall, the second waveguide path arranged for coupling electromagnetic signals to electronics at a first end, and arranged for coupling to the radiating signals at a second end; and a horn for transmitting and receiving the radiating signals, the horn coupled to the first waveguide path and to the second waveguide path, and comprising:
an upper horn wall comprising a plate with a first horn ridge extending from a base of the horn and projecting toward an inner region of the horn and a second horn ridge extending from the base of the horn and projecting toward the inner region of the horn; anda lower horn wall comprising a plate with a first horn ridge extending from the base of the horn and projecting toward the inner region of the horn and a second horn ridge extending from the base of the horn and projecting toward the inner region of the horn.