CPW-饋入與背面挖地結構帶通濾波器設計

本篇論文提出利用共平面波導線、螺繞曲線、希爾伯特曲線與背面挖地的結構，綜合四種結構的特點，設計出新式的帶通濾波器。在槽型希爾伯特曲線DGS中，得到的響應特性為，中心頻率 1.90 GHz，介入損耗為 -0.92 dB，高的零點衰減量 -48.60 dB與較寬的頻寬23%等。加入平行線耦合結構與十字耦合中，響應特性均為雙頻。在加入平行線耦合中，得到的響應特性為，中心頻率 1.90 GHz / 3.98 GHz，介入損耗為 -0.94 dB / -0.79 dB，高的零點衰減量 -46.92 dB / -25.70 dB，百分比頻寬24% / 13%等，皆可應用於寬頻GSM(1.8 GHz)與PHS(1.9 GHz)系統中。在加入十字耦合中，中心頻率 2.36 GHz / 6.17 GHz，介入損耗為 -0.81 dB / -0.87 dB，高的零點衰減量 -42.74 dB / -42.74 dB，百分比頻寬22.8% / 36.3%等，可應用於WLAN 802.11a/b (5 GHz / 2.4 GHz)以及藍芽(2.4GHz)。

關鍵字

共平面波導線；螺線型；希爾伯特曲線；背面挖地結構；帶通濾波器

並列摘要

Merging coplanar waveguide, spiral, Hilbert curve and defected ground structure, the novel bandpass filter design is proposed in this thesis. For Hilbert slot spiral resonator in DGS, the results with center frequency 1.90 GHz, low insertion loss -0.92 dB, higher out-of-band zero level -48.60 dB and wide band 23% are obtained. Frequency responses are dual-band for parallel line and cross line coupled structure. For Hilbert slot spiral resonator with parallel line, the results with center frequency 1.90 GHz / 3.98 GHz, low insertion loss -0.94 dB / -0.79 dB, higher out-of-band zero level -46.92 dB / -25.70 dB and wide band 24% / 13% are obtained. The filter can achieve for GSM(1.8 GHz) and PHS(1.9 GHz) applications. For Hilbert slot spiral resonator with cross line, the performance of center frequency 2.36 GHz / 6.17 GHz, lower insertion loss -0.81 dB / -0.87 dB, high out-of-band zero level -42.74 dB / -42.74 dB and wider band filters 22.8% /36.3% are achieved. The filter can be used for WLAN 802.11a/b (5 GHz / 2.4 GHz) and Bluetooth (2.4 GHz) applications.