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Coplanar 4-bit HEMT phase shifters for 94 GHz phased array radar systems

Koplanarer 4-Bit-Phasenschieber für Radar-Systeme mit phasengesteuerten Antennen bis 94 GHz
: Züfle, K.; Steinhagen, F.; Haydl, W.H.; Hülsmann, A.

Matloubian, M. ; Institute of Electrical and Electronics Engineers -IEEE-; IEEE Microwave Theory and Techniques Society:
IEEE MTT-S International Microwave Symposium Digest 1999. Vol.1
Piscataway, NJ: IEEE, 1999
ISBN: 0-7803-5135-5
ISBN: 0-7803-5136-3
International Microwave Symposium <1999, Anaheim/Calif.>
Fraunhofer IAF ()
GaAs; MMIC; phase shifter; Phasenschieber; W-band

Coplanar 4-bit phase shifters for W-band operation at 94 GHz have been developed using PM-HEMTs as switching elements. The phase shifter MMIC uses double stub loaded lines and branch line couplers. A two-stage variable gain cascode amplifier was integrated with the phase shifter. This combination has insertion gain of 2-8 dB and occupies an area of 1.5x4 mm2. A redesigned version of the phase shifter occupies 1x2.5 mm2 chip area, and has a standard phase deviation of less than 2.1 deg for all phase states.