Dual reflector antenna

Details Dual reflector antenna Dual reflector antenna

1981-01-23

1982-10-26

Lieberman, Eli

Communications: radio wave antennas

Antennas

Wave guide type

H01Q 1919

Patent

active

043564941

ABSTRACT:
An earth station antenna is employed for telecommunicating with a satellite in combination with an automatic tracking apparatus. The antenna is a dual reflector antenna which comprises a main reflector, a sub-reflector and a primary radiator, and the used frequency band of the antenna is at least 1.8 octaves. A parameter t of the antenna, defined by a configuration of the primary radiator is less than 0.3 at the lowest operating frequency. The phase center of the primary radiator, at a low frequency within the operating frequency range, is made to correspond with the focus of the sub-reflector.
The above parameter t is defined by: ##EQU1## where: .lambda.: wavelength in free space,

REFERENCES:
patent: 3821746 (1974-06-01), Mizusawa
patent: 4044361 (1977-08-01), Yokoi et al.
patent: 4062018 (1977-12-01), Yokoi et al.
Hogg & Semplak; An Experimental Study of Cassegrainian Antennas; Bell System Technical Journal; Nov. 1964, pp. 2677-2704.
Hannan; Microwave Antennas Derived from Cassegrain Telescope, IRE Transactions on Antennas and Propagation Mar. 1961, pp. 140-153.
Potter; Application of Cassegranian Principle-to-Space Comm., IRE Trans. on Space Electronics and Telemetry, Jun. 1962, pp. 154-158.

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