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Short-wavelength transmission line with variable characteristic impedance for application to matching components on MMIC

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1 Author(s)
Y. Yun ; Korea Maritime University, Korea

A short-wavelength transmission line with variable characteristic impedance (STLVCI) employing periodically loaded diodes is proposed. Compared with the conventional transmission line, the STLVCI shows a much shorter wavelength, and the characteristic impedance of the VATL is easily controlled by changing only the supplied voltage. Using the STLVCI, a ??/4 impedance transformer has been fabricated on a GaAs MMIC, and its line length is 375 ??m, which is 28.3% of that of the conventional impedance transformer. Using the ??/4 impedance transformer, impedance matching could be performed between RF components with various characteristic impedance of 30-100 ?? by adjusting the applied voltage.

Published in:

Electronics Letters  (Volume:46 ,  Issue: 6 )