Title :
Coplanar 4-bit HEMT phase shifters for 94 GHz phased array radar systems
Author :
Zuefle, K. ; Steinhagen, F. ; Haydl, W.E. ; Hulsmann, A.
Author_Institution :
Fraunhofer Inst. for Appl. Solid State Phys., Freiburg, Germany
Abstract :
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 1.5/spl times/4 mm/sup 2/. A redesigned version of the phase shifter occupies 1/spl times/2.5 mm/sup 2/ chip area, and has a standard phase deviation of less than 2.1/spl deg/ for all phase states.
Keywords :
HEMT integrated circuits; coplanar waveguide components; field effect MIMIC; millimetre wave phase shifters; phased array radar; waveguide couplers; 2.8 dB; 94 GHz; HEMT phase shifters; W-band operation; branch line couplers; coplanar phase shifters; double stub loaded lines; insertion gain; phase states; phased array radar systems; standard phase deviation; switching elements; two-stage variable gain cascode amplifier; Circuits; Couplers; Frequency; Gain; HEMTs; Insertion loss; MMICs; Phase shifters; Phased arrays; Radar;
Conference_Titel :
Microwave Symposium Digest, 1999 IEEE MTT-S International
Conference_Location :
Anaheim, CA, USA
Print_ISBN :
0-7803-5135-5
DOI :
10.1109/MWSYM.1999.779480
