Communications: directive radio wave systems and devices (e.g. – With particular circuit – With polarization
Patent
1993-12-03
1997-08-19
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
With polarization
G01S 1300
Patent
active
056593228
ABSTRACT:
The invention concerns a microwave transmit/receive (T/R) circuit for a polarization synthesizer array antenna, especially a radar antenna. According to the invention the required polarization is obtained by applying two signals to an array element on two orthogonal feed paths with a variable phase difference between the two paths, both of which function simultaneously. In a preferred embodiment both transmit channels are provided with two power amplifiers which each amplify a signal from an in-phase power divider or a hybrid coupler, with a one-bit or two-bit controllable phase-shifter adding a phase-shift of 0.degree., 90.degree. or 180.degree. to synthesize orthogonal linear or circular polarizations. In a preferred embodiment the circuit according to the invention is partly or entirely implemented in monolithic (MMIC) technology. The invention also concerns an antenna including a T/R circuit as specified hereinabove.
REFERENCES:
patent: 3022506 (1962-02-01), Goebels, Jr. et al.
patent: 3357013 (1967-12-01), Hart et al.
patent: 4063248 (1977-12-01), Debski
patent: 4737793 (1988-04-01), Munson
patent: 5270719 (1993-12-01), Roth
patent: 5337058 (1994-08-01), Cross
French Search Report FR 9214661.
ALCATEL N.V.
Hellner Mark
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