應用網格式耦合結構與互補式不連續環型諧振器於寬頻帶通濾波器設計與分析

Design and Analysis of Wideband-pass Filter with Mesh-shaped Couplings and CSRR

林協志(Hsieh-Chih Lin)

指導教授 ： 劉智群

健行科技大學/電資學院/電機工程所/碩士(2010年)

摘要

本論文設計以SRR與CSRR/CSLR三種結構為主軸，透過方環挖槽與方環結構得到帶通濾波器及寬頻的響應特性。由耦合結構的調整及改良，SRR與方環挖槽式耦合結構可達到雙頻響應，並在第二頻段呈現寬頻特性。CSRR/CSLR與網格式耦合結構可呈現寬頻特性，使零點衰減更對稱，並改善原本漣波過大的缺點。接著提出ㄇ型挖槽結構放置輸出/入位置，藉此改善過高的高頻諧波，達到抑制效果。最後提出改良型等效電路並以電流分佈及頻率響應探討其特性。
在實例上，設計方環挖槽式耦合SRR雙頻帶通濾波器，所獲得之頻帶一比例頻寬為27.8%，頻帶二比例頻寬為63.4%，通帶外的高衰減特性為-39.6 dB；網格型耦合CSRR/CSLR帶通濾波器，比例頻寬為89.4%及100%，最小介入損耗為-0.89 dB及-0.80 dB，在加入ㄇ型挖槽結構後，高頻諧波皆可抑制至-25 dB以下。

關鍵字

互補式不連續環型諧振器 ； 帶通濾波器 ； 表面電流分佈 ； 等效電路

並列摘要

In the design, using square ring slot and square ring applied to SRR and CSRR/CSLR for band pass filter, and wide-band are proposed in this thesis. Through the coupled structure adjustment, SRR and square ring slot can be presented dual-band response, and the second band is with broadband response. CSRR/CSLR and mesh-shaped coupling can present wide-band response, more symmetrical zero level attenuation, and less ripple. Then apply the ㄇ-shaped coupling to the output / input port, it can suppress the high frequency harmonics. The modified equivalent circuit model is proposed for analyzing the responses with current distribution and frequency response.
For SRR-based BPF with square ring slot, in band 1 and band 2, the wider bandwidth about 27.8% / 63.4%, and the higher rejection -42.02 dB responses are presented. The CSRR/CSLR-based BPF with mash-shaped coupling, wider bandwidth about 89.4% / 100%, and min insertion loss -0.89dB / -0.80dB are obtained. In addition ㄇ-shaped, the high frequency harmonics are below -25 dB.

並列關鍵字

Complementary split ring resonator ； Band-pass filter ； Surface current distributions ； Equivalent circuits

參考文獻

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