Wideband MMIC active quadrature hybrid

Details Wideband MMIC active quadrature hybrid Wideband MMIC active quadrature hybrid

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

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