Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1989-03-23
1990-04-03
Gensler, Paul
Wave transmission lines and networks
Plural channel systems
Having branched circuits
330126, 330277, 333112, H03H 1122
Patent
active
049147285
ABSTRACT:
A wideband active quadrature 90 degree hybrid for increased bandwidths with low power losses and the capability to have gain. The 90 degree hybrid can be incorporated in small areas for MMIC (monolithic microwave integrated circuits) circuitry in the low microwave frequencies. The 90 degree hybrid comprises a plurality of 90 degree phase shift means, each preceded by an input amplifier. Each of the 90 degree differential phase shift means comprises a high pass and a low pass filter. The low pass filter outputs are added together and amplified. The high pass filter outputs are also added together and amplified. The resultant amplified signals are output with a phase differential of 90 degrees. The amplifiers supply gain which is lost in the 90 degree phase shifting.
REFERENCES:
patent: 3295134 (1966-12-01), Lowe
patent: 4673898 (1987-06-01), Redmond
Gensler Paul
Motorola Inc.
Powell Jordan C.
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