交織耦合佈局之雙頻帶通濾波器

專利類型

發明

專利國別 (專利申請國家)

中華民國

專利申請案號

097136664

專利證號

I 362781

專利獲證名稱

交織耦合佈局之雙頻帶通濾波器

專利所屬機關 (申請機關)

國立彰化師範大學

獲證日期

2012/04/21

技術說明

本專利案以平行耦合微帶線為基礎之架構，設計一款含四個共振器的濾波電路架構，微帶線之間的耦合採用新穎的交織耦合佈局，同時也結合雙耦合的電路結構。一般而言，微帶線之耦合間距太小會引起過耦合現象，間距大會導致耦合不足的情形影響頻寬。因此本專利之優點是，訊號之饋入與輸出級之微帶線共振器以及位於中階的微帶線共振器都能同時與相鄰不同的兩個微帶線共振器耦合，形成雙耦合形式，能在不引起過耦合之情況下（即保持適當的耦合間距），能有效的維持或加強耦合強度，增加通帶的頻寬。 本濾波器為雙耦合之結構，其中它巧妙地採取了交織式的耦合佈局，使得電路具備有多個可控制的傳輸零點，而這些零點分別安置於各個通帶兩邊之裙襬處與止帶區，用以加強濾波器的訊號選擇性與止帶區的訊號壓抑效果。濾波器中零點發生頻率由微帶線之耦合長度與非耦合長度作適度設計而共同決定之，具可控性。 The dual-band bandpass filter (BPFs) based on the doubly parallel-coupled stepped impedance resonators (SIRs) structures were proposed in this document. The coupled-SIRs with open-stub-loads were introduced in the filter design. The dual-band filters exhibiting multiple zeros design operate at 2.45/5.5 GHz for the WLAN applications. Two three-staged filters composed of four SIRs were proposed with the tapped-line adapted in the I/O sections. The proposed filter has the advantages of a much wider bandwidth in both the passbands without sacrificing the passband’s insertion loss and passband flatness. The design procedure for a conventional parallel-coupled microstrip lines model is still suitable to design the proposed filters. The interlaced circuit layout for the doubly-parallel-coupled SIR filter design allow this circuit to have multiple transmission zeros which are used to enhance the filter’s signal selectivity and the stopband performance.

備註

本部(發文號1080030164)同意該校108年5月14日研字第1080400128號函申請終止維護專利。

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