Title :
Design of an electronically tunable microwave impedance transformer
Author :
Sinsky, J.H. ; Westgate, C.R.
Author_Institution :
Appl. Phys. Lab./Dept. of Electr. & Comput. Eng., Johns Hopkins Univ., Baltimore, MD, USA
Abstract :
A new technique is introduced for designing continuously variable electronically tunable microwave impedance transformers that can be implemented using MIC or MMIC technology. An S-band tunable transformer has been built and measurements demonstrate a circuit which can transform impedances from 50 /spl Omega/ to a range of 4-392 /spl Omega/. A typical transformation from 50 /spl Omega/ to 162 /spl Omega/ yields a measured 0.5 dB instantaneous bandwidth of 14-16%, tunable bandwidth of 18%, and insertion loss of 0.6-0.9 dB. Applications for this novel technique include the design of electronically tunable wireless components, solid state power amplifiers, microstrip antennas, and microwave modulated laser transmit/receive systems.
Keywords :
MMIC; circuit tuning; hybrid integrated circuits; impedance convertors; microstrip circuits; microwave integrated circuits; 0.6 to 0.9 dB; MIC technology; MMIC technology; S-band; electronically tunable impedance transformer; microwave impedance transformer; Antenna measurements; Bandwidth; Impedance measurement; Loss measurement; MMICs; Microstrip antennas; Microwave integrated circuits; Microwave technology; Microwave theory and techniques; Tunable circuits and devices;
Conference_Titel :
Microwave Symposium Digest, 1997., IEEE MTT-S International
Conference_Location :
Denver, CO, USA
Print_ISBN :
0-7803-3814-6
DOI :
10.1109/MWSYM.1997.602875
