Title :
Broadband, planar, doubly balanced star mixers
Author :
Chi-Yang Chang ; Ching-Wen Tang ; Dow-Chih Niu
Author_Institution :
Inst. of Electr. Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
Planar broadband star mixers comprising two CPW-CPS T-junction dual baluns are developed. The bandwidth is about 6:1 without treatment of even mode resonance. After improving the even-mode resonance, the measured relative bandwidths of the star mixers can be larger than 15:1. The planar structure of the circuit is suitable for both MIC and MMIC fabrication. Some MIC prototype circuits are fabricated with an Al/sub 2/O/sub 3/ substrate. The measured conversion losses of the star mixers are about 6 to 10 dB typically within the bandwidth.
Keywords :
MMIC mixers; baluns; coplanar waveguide components; hybrid integrated circuits; integrated circuit design; microwave integrated circuits; strip line components; 6 to 10 dB; Al/sub 2/O/sub 3/; Al/sub 2/O/sub 3/ substrate; CPW-CPS T-junction dual baluns; MIC fabrication; MMIC fabrication; broadband star mixers; doubly balanced star mixers; even-mode resonance; planar star mixers; Bandwidth; Coplanar waveguides; Diodes; Equivalent circuits; Impedance matching; Microwave integrated circuits; Radio frequency; Resonance; Transmission line theory; Wires;
Conference_Titel :
Microwave Symposium Digest. 2000 IEEE MTT-S International
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-5687-X
DOI :
10.1109/MWSYM.2000.861098
