Dual frequency launcher for circularly polarized antenna

Details Dual frequency launcher for circularly polarized antenna Dual frequency launcher for circularly polarized antenna

1988-08-10

1989-10-03

Hille, Rolf

Communications: radio wave antennas

Antennas

Wave guide type

343776, 333126, H01Q 1300

Patent

active

048722111

ABSTRACT:
A dual frequency antenna feed is formed from a central, circular waveguide onnected to the flat boundry of circular, disk-shaped resonant cavity. A second circular waveguide is connected one end of a disk-shaped resonant cavity. Energy of one frequency enters and exits the cavity along the common axis of the waveguides. Energy of the second frequency is introduced to the same resonant cavity by way of a plurality of bandpass filters, also connected to the cavity. This energy enters by way of slots in the cylindrical walls of the cavity. The central circular waveguide is propagating at one frequency but cut off at the second frequency. These bandpass filters are at this pass band for the second frequency, but at the rejection band for the first frequency. Therefore, the isolation between these two input ports are obtained.

REFERENCES:
patent: 2566900 (1951-09-01), McArthur
patent: 3265995 (1966-08-01), Hamasaki
patent: 3581311 (1971-05-01), Kach
patent: 3633110 (1972-01-01), Sullian et al.
patent: 4042935 (1977-08-01), Ajioka et al.
patent: 4258366 (1981-03-01), Green
patent: 4419670 (1983-12-01), Hill
patent: 4554552 (1985-11-01), Alford et al.
patent: 4695844 (1987-09-01), Houchangnia
patent: 4697192 (1987-09-01), Hofer et al.

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