利用環型共振器改良 超寬頻帶通濾波器之設計與研究

Design of Ultra-Wideband Bandpass Filter with Improved Stopband Based on Ring Resonator

向芝儀(CHIH-YI HSIANG)

指導教授 ： 鄭慧愷

中原大學/工學院/電子工程研究所/碩士(2011年)

https://doi.org/10.6840/cycu201100751

摘要

摘要
本文研究應用於超寬頻通訊系統之微波帶通濾波器，此濾波器架構是由兩個帶拒濾波器：一為步階阻抗共振器(Stepped-Impedance Resonator)，另一個為均勻阻抗環型共振器(Ring-Resonator)串接組成。步階阻抗共振器在此提供超寬頻所需之頻寬及低頻零點，而均勻阻抗環型共振器所產生的零點可加速高頻通帶處衰減速度(Roll-Off Rate)，並可有效抑制通帶外(Out-of Band)倍頻諧波，使濾波器達到寬截止帶的效果。我們於氧化鎂(MgO)基板上以釔鋇銅氧(YBCO)高溫超導薄膜進行實際模擬設計，成果顯示通帶範圍為3.8 GHz～9.4 GHz，中心頻率f0 = 6.6 GHz，比例頻寬85%，反射損耗S11小於24dB，通帶外高頻處插入損耗S21有13dB以上的抑制效果直至15 GHz。

關鍵字

超寬頻 ； 帶通濾波器 ； 濾波器 ； 步階阻抗

並列摘要

Abstract
This thesis is focused on the microwave bandpass filter for Ultra-Wideband communication systems. The proposed ultra-wideband bandpass filter consists of cascade two bandstop filters where one is stepped-impedance resonator and the other is uniform ring resonator. The bandwidth and low frequency transmission zero is realized by the stepped-impedance resonator. The uniform ring resonator can be generated transmission zeros and suppress spurious passband by input/output feeding structure. Therefore, the transition-band roll-off rate is dramatically increased and the stopband range is significantly increased. We design a filter by using YBa2Cu3O7-δ(YBCO) high-temperature superconductor(HTS) thin films on the MgO substrate.The simulation results show that the passband is between 3.8~9.4 GHz,and the center frequency of 6.6 GHz,Fractional bandwidth (BW) Δ= 85%, return loss is better than 24 dB, and suppression on upper stopband above 13 dB until 15 GHz.

並列關鍵字

Bandpass Filter ； Ultra-Wideband ； Filter ； SIR

參考文獻

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