科研之友
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摘要
This article demonstrates a frequency-tunable dual-band branch line coupler based on composite right/left-handed transmission lines. A simple, yet effective conversion enables to design such transmission lines in a form that can be frequency tuned. A tuning function is realized with varactors. For demonstration, a dual-band branch line coupler at 0.6 and 1.2 GHz is fabricated. Tuning ranges of 51.4 and 18.0% are measured in the lower and upper band, respectively, in which vertical bar S(2I)/S(3I)vertical bar <= +/- 0.5 dB is obtained, when maintaining S(1I) below -10 dB.
- 出版日期2010-9
