步階式阻抗諧振濾波器(STEP IMPEDANCE RESONATOR FILTER)

專利類型

發明

專利國別 (專利申請國家)

美國

專利申請案號

14/983,635

專利證號

US 9,748,621 B2

專利獲證名稱

步階式阻抗諧振濾波器(STEP IMPEDANCE RESONATOR FILTER)

專利所屬機關 (申請機關)

義守大學

獲證日期

2017/08/29

技術說明

傳統的SIR濾波器的電路佈局偏狹長型，對電路的整合有一定的難度; 因此，我們利用分支饋入(TapIn)的方法，降低插入損耗(Insertion Loss)以及減少一階的共振結構，除了可以節省一級耦合結構；進而減少了濾波器的表面積。此外，SIR濾波器只使用低阻抗部分的結構進行耦合而導致耦合部分的間距過於接近，且耦合量有限；因此本專利提出改善耦合量的方法:將低阻抗部份進行耦合延伸成使用整個SIR結構進行耦合，如此一來可以有更多的面積讓能量通過，也因此可以求得更高的耦合係數，以增進濾波電路的頻率響應。 The traditional Stepped Impedance Resonators (SIRs) filter’s circuit has some difficulty in integrating with the circuit. We combined the tapped-line and over-coupled method to reduce the insertion loss and size of one-section SIR dual-band bandpass filter (DBPF). The SIR structure can be seen as two open-circuit transmission lines, so it can produce more than two transmission zeros. By appropriation to control the position of the tapped-line, a transmission zero would be produced at the demanding frequency. The inherent transmission zero of an over-coupled input/output stage is shown as tunable. It is found that increasing the image impedance of the filter sections can further enhance the suppression. This selectivity of the filter can be increased by increasing the attenuation on both sides of the pass band. The SIR DBPF shows a good simulated performance, which is in good agreement with measurement results for dual-band wireless LAN applications at 2.45 and 5.25GHz.

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