Applications of Dispersion-Engineered Composite Right-/Left-Handed Transmission Line Stubs for Microwave Active Circuits

Shinichi TANAKA  Kengo SAITO  Toshiaki OKA  Yodai SHIBOSAWA  

IEICE TRANSACTIONS on Electronics   Vol.E100-C   No.10   pp.866-874
Publication Date: 2017/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E100.C.866
Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
CRLH,  left-handed,  metamaterials,  micro-strip line,  rectifier,  amplifier,  

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Novel design approaches for microwave active circuits using composite right-/left-handed (CRLH) transmission line (TL) stubs are presented. We show that, by modifying the dispersion diagram of the CRLH TL stub, the frequency band or the harmonic tuning capability can be enhanced in such a way that it would have been difficult or impractical if done using conventional micro-strip line stubs. The frequency response of the CRLH TL stub can be controlled almost arbitrarily while at the same time reducing the stub length significantly, because the dispersion curve in the left-handed region and in the right-handed region is controlled independently. As a proof of concept, a triple-band rectifier, single-band and dual-band harmonic tuning circuits for class-F amplifiers are demonstrated.