Reflector-type microwave antennas with absorber lined conical feed
First Claim
1. A conical horn-reflector antenna comprising the combination of:
- a paraboloidal reflector forming a paraboloidal reflecting surface for transmitting and receiving microwave energy,a smooth-walled conical feed horn for guiding microwave energy from the focus of said paraboloidal reflecting surface to said reflector, anda lining of absorber material on the inside wall of the horn for reducing the width of the RPE in the E plane of the antenna without significantly increasing the width of the RPE in the H plane, said absorber increasing the Eigen value E and the sperical hybridicity factor Rs sufficiently to cause the E plane and H plane RPEs to approach each other.
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Reexamination
Accused Products
Abstract
A feed horn for a reflector-type microwave antenna comprises a smooth-walled conical horn and a lining of absorber material on the inside wall of the horn for reducing the width of the RPE (radiation pattern envelope) in the E plane of the antenna. The lining of absorber material extends from the wide end of the conical feed toward the narrow end thereof, terminating at a point where the horn diameter is about 7 times the longest wavelength of the microwave signals being transmitted. The width of the RPE in the E-plane of the antenna can be reduced to be nearly equal to the width of the RPE of the H-plane of the antenna without significantly degrading this H-plane RPE from its shape without absorber and without significantly changing the gain of the antenna.
19 Citations
7 Claims
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1. A conical horn-reflector antenna comprising the combination of:
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a paraboloidal reflector forming a paraboloidal reflecting surface for transmitting and receiving microwave energy, a smooth-walled conical feed horn for guiding microwave energy from the focus of said paraboloidal reflecting surface to said reflector, and a lining of absorber material on the inside wall of the horn for reducing the width of the RPE in the E plane of the antenna without significantly increasing the width of the RPE in the H plane, said absorber increasing the Eigen value E and the sperical hybridicity factor Rs sufficiently to cause the E plane and H plane RPEs to approach each other. - View Dependent Claims (2, 3, 4)
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- 5. A method of reducing the width of the RPE pattern envelope in the E plane of a conical horn-reflector antenna having a paraboloidal reflector forming a paraboloidal reflecting surface for transmitting and receiving microwave energy, and a smooth-walled conical feed horn for guiding microwave energy from the focus of said paraboloidal reflecting surface to said reflector, said method comprising lining at least a portion of the inside wall of said feed horn adjacent to the wide end thereof with an absorber material which increases the taper of the field distribution along the radii of said horn in the E plane, said absorber increasing the Eigen value E and the sperical hybridicity factor Rs sufficiently to cause the E plane and H plane RPEs to approach each other.
Specification