Design of Dual-band bandpass Filters
| Autor: | Chung-Lin Li, 李忠霖 |
|---|---|
| Rok vydání: | 2007 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 95 Dual-band filter of the multi-resonance will occupy a large amount of circuit surface. This paper will present dual band filter design on single resonance. The resonator structure of coupling filter use stepped impedance resonator (SIR) with anti-parallel coupling, over coupling, whole structure coupling method and parallel coupling structure to compare for transmission zero and reject bandwidth. In order to retrench the time of analyze the structure of resonators, this thesis use Coupling Coefficient method. This method can synthesize the required filter under different circuit, only re-simulation the frequency responded and the coupling coefficient for resonator. Compare various kinds of coupling structure to find that anti-parallel coupling method. It can generate one transmission zero and compact resonator. The over coupling method can generate three individual transmission zero in the high and low pass band side and the stop band center that can shorten the altogether horizontal length of the resonator. The whole structure coupling method can generate transmission zero at both sides in each pass band. The each pass band that separates to each other can have more attenuation bandwidth. This length of resonance structure is equal to the length of resonator and can reduce the occupy area of PCB. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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