Tunable Dual-Frequency Immittance Inverters on Dual-Composite Right/Left-Handed Transmission Lines (D-CRLH TL) with Variable Capacitors

Dmitry KHOLODNYAK
Evgenia ZAMESHAEVA
Viacheslav TURGALIEV
Evgenii VOROBEV

Publication
IEICE TRANSACTIONS on Electronics   Vol.E99-C    No.10    pp.1113-1121
Publication Date: 2016/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E99.C.1113
Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: 
Keyword: 
immittance inverter,  dual-bandpass filter,  lumped elements,  tunability,  

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Summary: 
Design of lumped-element immittance inverters which support dual-frequency operation and tuning of both operational frequencies is presented. Unique properties of the dual-composite right/left-handed transmission lines (D-CRLH TL) give an opportunity to design immittance inverters with two non-multiple operational frequencies and a stop band between them. Replacement of capacitors of D-CRLH TL unit cells with variable ones enables inverter tunability. Tunability analysis of such immittance inverters is given. It is shown that a tuning range of the operational frequencies is limited by a tolerable variation of the inverter parameter. The design concept is verified by results of electromagnetic simulation and measured frequency characteristics of fixed (non-tunable) as well as tunable dual-frequency immittance inverters and dual-band filters using the inverters.