带通和带拒滤波器ppt课件

1、2022/1/291微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-1第第1010單元單元 帶通與帶拒濾波器之設計與帶通與帶拒濾波器之設計與製作製作 帶通與帶拒濾波器之設計與製作帶通與帶拒濾波器之設計與製作2022/1/292微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-2Band Pass Filter Design Transformation form Low Pass to Band PassFrequency12BWBWffc0 dBAnt.60 dB3 dBBW1BW20 dBAnt.60 dB3 dBBW1BW22022/

2、1/293微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-3 Elements Transformation form Low Pass to Band PassBand Pass Filter DesignShunt Element becomes Parallel-ResonantSeries Element becomes Series-Resonant2233222322022/1/294微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-4BPF Frequency and Impedance ScalingFor Parallel

3、-Resonant Branches:For Series-Resonant Branches:RB2CCnn2oLf2RBLRCf2BCn2oB2RLLnWhereR=The Final Load ImpedanceB=3-dB Bandwidthfo=The Center Frequency Ln=normalized InductorCn=normalized Capacitor2022/1/295微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-5Summary of the Bandpass Filter Design Procedure1. Transfe

4、r the Bandpass requirements into equivalent low-pass requirements.2. Refer to the low-pass attenuation curves provided in order to find a response that meets the requirements of step1.3. Find the corresponding low-pass prototype and write it down.4. Transform the low-pass network into a bandpass con

5、figuration.5. Scale the bandpass configuration in both impedance and frequency. 2022/1/296微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-6BPF Design ExampleEx. Design a BPF with the following requirementfo = 75 MHzBW3 dB = 7 MHzBW45 dB = 35 MHzPassband Ripple = 1 dBRS = 50 ohmsRL = 100 ohmsSol:5MHz7MHz35BWBW

6、dB3dB45參考13-22頁之右圖可知，n = 3時之Chebyshev 可滿足設計之需求。 參考相關書本可得低通濾波器之雛形電路圖。將前面所得之低通濾波器之雛形電路圖轉成帶通濾波器之雛形電路。2022/1/297微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-70.54.4311C2L3C2.2160.81710.54.4312.2160.81714.4312.2160.817Low-Pass PrototypeBand-Pass Prototype100501.86 uH2.4 pF1007 pF4.47 nH8.93 nH504 pFpFC1007)107)

7、(100(2431. 461nHL47. 4)431. 4()1075(2)107)(100(2661參考14-4頁可得2022/1/298微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-8 二階帶通濾波器二階帶通濾波器帶通濾波器可由低通與高通濾波器串連而成帶通濾波器可由低通與高通濾波器串連而成21o122022/1/299微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-9簡易二階簡易二階 RLC 被動帶通濾波器被動帶通濾波器iVoVRCRL12212212122222222&1;1)2()/2(/)/()/(22)(ZZ(1)(

8、1)(1ZBWRCLRLCSSSSLCRCSLRSSRCSRSLCSRLCRSSLSLRSLSLRCSRLCRSSLRSLRSLRVVLCSSRCSLRSLRSCSLRSCoooio，且其中則令2022/1/2910微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-10Band Rejection Filter Design0 dBAnt.60 dB3 dBBW1BW21f4f2f3f Design approach similar to band pass filterffffffBWBWc3214212022/1/2911微波通訊系統設計微波通訊系統設計Autho

9、r:Man-Long Her14-11Transformation form Low Pass to Band RejectionShunt Element becomes Shunt Series-Resonant CircuitsSeries Element becomes Series Parallel-Resonant Circuit9366633992022/1/2912微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-12BRF Frequency and Impedance ScalingFor Series-Resonant Branches:For

10、Parallel-Resonant Branches:RB2CCnn2oLf2RBLRCf2BCn2oB2RLLnWhereR = The Final Load ImpedanceB = 3-dB Bandwidthfo = The Center Frequency Ln = normalized InductorCn = normalized Capacitor2022/1/2913微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-13 70 MHz 帶通濾波器帶通濾波器2022/1/2914微波通訊系統設計微波通訊系統設計Author:Man-Long Her14

11、-14帶通濾波器之頻率響應量測結果帶通濾波器之頻率響應量測結果2022/1/2915微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-15帶通濾波器之輸出入返回損耗量測結果帶通濾波器之輸出入返回損耗量測結果2022/1/2916微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-16帶通濾波器之介入耗損量測結果帶通濾波器之介入耗損量測結果2022/1/2917微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-17 900 MHz 帶拒濾波器帶拒濾波器2022/1/2918微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-18帶拒濾波器之頻率響應量測結果帶拒濾波器之頻率響應量測結果2022/1/2919微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-19帶拒濾波器之輸出入返回損耗量測結果帶拒濾波器之輸出入返回損耗量測結果2022/1/2920微波通訊系統設計微波通訊系統設計Author:Man-Long Her14-20帶拒濾波器之介入耗損量測結果帶拒濾波器之介入耗損量測結果2022/1/2921微波通訊系統設計微波通訊系統設計Aut