Multifrequency broadband polarized horn antenna

Details Multifrequency broadband polarized horn antenna Multifrequency broadband polarized horn antenna

1979-01-31

1981-03-24

Moore, David K.

Communications: radio wave antennas

Antennas

Wave guide type

343755, 343772, 343781R, H01Q 1300

Patent

active

042583667

ABSTRACT:
A multifrequency, broadband, dual-polarized corrugated conical horn antenna is simultaneously fed a multiplicity of signals, two for each of five frequencies, with each of a pair of signals fed in each of two orthogonal planes for excitation of a desired spherical hybrid mode (HE.sub.11). The lowest frequency is fed into the horn through orthogonal pairs of colinear slots, each pair being fed by coaxial tee power dividers. Other signals are fed through a circular waveguide connected to the vertex. Band reject cavities block the next higher frequency from passing through the low frequency feed slots. The highest frequency signals are fed through orthogonal ports near the far end of the circular waveguide. The intermediate frequency signals are fed through orthogonal ports spaced along the waveguide. Filtering is incorporated for each to maintain isolation and low insertion loss, a quarterwave step transformer is used between the highest frequency (37 GHz) ports and the two next lower frequencies (21 GHz and 18 GHz) to provide a short circuit for these two lower frequencies, and a TM.sub.11 mode generator for the highest frequency is used as a short circuit for the next lower frequency (10.69 Ghz).

REFERENCES:
patent: 3369197 (1968-02-01), Giger et al.
patent: 3568204 (1971-03-01), Blaisdell
patent: 3754273 (1974-07-01), Takeichi et al.
patent: 3936838 (1976-02-01), Foldes
patent: 3949404 (1976-04-01), Green
Green, Kenneth, "Multifrequency, Broadband, Dual-Polarized Antenna", NASA Tech. Brief, Winter 1976, NPO 13866, p. 516.
Takeda et al., "Broadbanding of Corrugated Conical Horns", IEEE Trans. on Ant. and Prop., Nov. 1976, pp. 786-792.
Kumazawa et al., "Wide-Band Communication Satellite Antenna", IEEE Trans on Ant. and Prop., May 1975, pp. 404-407.

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