Abstract
AbstractThe concept of double‐Lorentz (DL) transmission lines (TL) provides two additional degrees of freedom in realizing triband microwave devices. The triband operation is accomplished by the flexible phase slope characteristic of the DL TL with the frequency. In this article, the theory, design procedure, and implementation of the triband quarter‐wave (λ/4) DL TL are presented. Moreover, the triband λ/4 open‐circuit stub and triband branch‐line coupler (BLC) are introduced for the application of mobile TV service. The simulated and measured results of these triband components are also presented. The λ/4 DL TL open‐circuit stub demonstrates insertion loss larger than 17 dB at each target band. The triband BLC has S‐parameters of output larger than −4.569 dB, return losses larger than 14 dB, isolations larger than 15 dB, phase differences of output 90° ± 5° at each target band. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1174–1177, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23311
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