| Summary: | 碩士 === 清雲科技大學 === 電子工程研究所 === 97 === Novel design of dual-mode double square-loop/ring resonators using CPW-fed and dual-mode perturbations are applied for multi-band and wide-band applications. In the design, using CPW-fed with twin-T structure coupling to DMDSLR/DMDRR for dual-band, tri-band, quad-band, and wide-band are proposed in this thesis. For practice, due to two concentric rings determine the certain resonated frequencies, we can get 0.9/ 1.2/ 1.8/ 2.4 GHz quad bands in all and it can be applies to GSM system, wireless video security links and Wireless LAN systems communication system.
The quad-band be excited with asymmetric folded CPW-fed of DMDSLR. It exhibits a good performance including lower insertion loss (2.52/ 1.93/ 1.06/ 0.76 dB), higher out-of-band rejection level (-45/ -51/ -38/ -32/ -35 dB) and symmetry wider band (3.6 %/ 6.2 %/ 13.9 %/ 16.1 %) among 0.94/ 1.29/ 1.9/ 2.32 GHz quad bands respectively. In addition, we design the double square-loop on Aluminum Nitride (AIN) substrate, to have a wide-band bandpass response, with lower insertion loss (0.97 dB), deeper transmission zero level (35.4/ 34.6 dB) and wider bandwidth (43.22 %).
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