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PIER PIER B PIER C PIER M PIER Letters
2011-09-20
Theoretical Study of Microwave Transistor Amplifier Design in the Conjugately Characteristic-Impedance Transmission Line (Ccitl) System Using a Bilinear Transformation Approach
By
Rardchawadee Silapunt,

    Dr. Rardchawadee Silapunt

    Department of Electronic and Telecommunication Engineering

    King Mongkut's University of Technology Thonburi

    Thailand

    Homepage

Danai Torrungrueng

    Dr. Danai Torrungrueng

    Department of Electrical and Electronic Engineering

    Asian University

    Thailand

    Homepage

Progress In Electromagnetics Research, Vol. 120, 309-326, 2011
doi:10.2528/PIER11080504
Abstract
Conjugately characteristic-impedance transmission lines (CCITLs) are a class of transmission lines possessing conjugately characteristic impedances (Z0±) for waves propagating in the opposite direction. A typical Z0 uniform transmission line is a special case of CCITLs whose argument of Z0± is equal to 0o. This paper aims to generalize the CCITL system by demonstrating a theoretical study of CCITLs and their applications in the microwave transistor amplifier design. It is found that the bilinear transformation plays an important role in transforming circles in the reflection coefficient Г0-plane in the Z0 system to the Г-plane in the CCITL system. In addition, Meta-Smith charts, a graphical tool developed for solving problems in the CCITL system, are employed to design matching networks to achieve desired amplifier properties. Results show that stability regions on Meta-Smith charts can be determined, and source and load reflection coefficients can be selected properly to obtain desired operating power gain. In addition, an example shows that Meta-Smith charts offer a simple approach for matching network design using open-circuited single-stub shunt tuners.
Citation
Rardchawadee Silapunt, and Danai Torrungrueng, "Theoretical Study of Microwave Transistor Amplifier Design in the Conjugately Characteristic-Impedance Transmission Line (Ccitl) System Using a Bilinear Transformation Approach," Progress In Electromagnetics Research, Vol. 120, 309-326, 2011.
doi:10.2528/PIER11080504
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