Low sidelobe multi-beam lossless feed networks for array antenna

Details Low sidelobe multi-beam lossless feed networks for array antenna Low sidelobe multi-beam lossless feed networks for array antenna

1996-10-02

1999-01-05

Le, Hoanganh T.

Communications: radio wave antennas

Antennas

With coupling network or impedance in the leadin

343778, 342373, H01Q 2122

Patent

active

058568107

ABSTRACT:
Multi-beam antenna feed networks employ more aperture ports (e.g., ports I, II, III, IV and V) than beam ports (e.g., ports A, B, C and D) to achieve low sidelobe lossless operation, particularly for cellular communications. With five aperture ports, signal value outputs at the aperture ports represent orthogonal outputs having phase gradients effective to provide a four beam radiation pattern. The feed arrangement includes directional couplers (e.g., C11, C21) and phase shifters (e.g., P22, P23) intercoupled between the beam ports and aperture ports to provide the desired orthogonal aperture excitation. An example of specific directional coupler and phase shifter circuit values for a matrix network for a four beam port to five aperture port feed network configuration is provided.

REFERENCES:
patent: 3255450 (1966-06-01), Butler
patent: 4689627 (1987-08-01), Lee et al.
patent: 4962383 (1990-10-01), Tresselt
patent: 5125108 (1992-06-01), Talwar
patent: 5281974 (1994-01-01), Karamoto et al.

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