Compact Hairpin Resonator Shunt Open Stub Bandpass Filters with Dual-Band Response and Wide Upper Stopband
碩士 === 國立交通大學 === 電信工程系所 === 97 === Compact bandpass filters are devised with a dual-passband response and a wide upper stopband based on hairpin resonators with three shunt open stubs. One stub is tapped at the center and two are allocated on both sides symmetrically. By adjusting the stub lengths,...
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| Other Authors: | |
| Format: | Others |
| Language: | en_US |
| Published: |
2009
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| Online Access: | http://ndltd.ncl.edu.tw/handle/31928293205617241527 |
| Summary: | 碩士 === 國立交通大學 === 電信工程系所 === 97 === Compact bandpass filters are devised with a dual-passband response and a wide upper stopband based on hairpin resonators with three shunt open stubs. One stub is tapped at the center and two are allocated on both sides symmetrically. By adjusting the stub lengths, all resonators are designed to have two identical leading resonant frequencies but different higher-order ones. To enhance the rejection level and extend the upper stopband, the transmission zeros created by the tap structures and the coupled-line stage are used to eliminate the remaining leading unwanted peaks. Measured results show that the fifth-order filter has a rejection level below 30 dB can be extended to six times the first frequency. Good agreement between measured and simulation is obtained.
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