Broadband Microwave Filter Design Using Multimode Resonators
碩士 === 國立成功大學 === 電腦與通信工程研究所 === 97 === This thesis is on the network models and synthesis of microwave bandpass filters using dual-mode and triple-mode stepped-impedance resonators. It has proved that the circuit models of these filters are equivalent to those of the traditional parallel coupled-li...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2009
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| Online Access: | http://ndltd.ncl.edu.tw/handle/02891183760756023541 |
| Summary: | 碩士 === 國立成功大學 === 電腦與通信工程研究所 === 97 === This thesis is on the network models and synthesis of microwave bandpass filters using dual-mode and triple-mode stepped-impedance resonators. It has proved that the circuit models of these filters are equivalent to those of the traditional parallel coupled-line filters. In order to shift the third resonance of commensurate dual-mode stepped-impedance resonators to higher frequency for suppressing spurious response and reduce the total electrical length of the circuit, the synthesis methods using non-commensurate dual-mode stepped-impedance resonators are also derived.
The electrical length of triple-mode stepped-impedance resonators in the thesis is one wavelength. Although these resonators have triple-mode resonance, they are half-wavelength longer than half-wavelength resonators. In order to keep the electrical length of resonators to half-wavelength, the synthesis method of bandpass filter using triple-mode shunt short-circuited stub half-wavelength resonators is studied and presented at the end of this thesis.
Several bandpass filters using dual-mode stepped-impedance resonators and triple-mode shunt short-circuited stub half-wavelength resonators have been fabricated and tested. Comparisons of them with parallel coupled-line filters have been done to verify the proposed methods.
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