| Summary: | 碩士 === 大同大學 === 通訊工程研究所 === 89 === In this thesis, design of a new miniaturized narrow-band filter is discussed. It composes of four slip-ring step-impedance resonators. The resonant frequency of each resonator is firstly determined, then, the coupling coefficients between any two resonators and the external quality factor are extracted. A commercially available software package (IE3D version 5.3) was used in this survey.
Filters designed in this thesis are well prepared for 2.45GHz ISM-band use. The fractional bandwidth is around 4%. Two type of filters are studied-one is used to realize the Chebyshev function, and the other the elliptic function. The filters can be achieved with a 4-pole structure. The filter response could be composed of a coupling matrix. Each element is represented the coupling coefficient between two resonators. We expect the circuit area could be reduced effectively.
Finally, we measure the filter response with the network analyzer HP8510C, and compare the measured results with the theoretical and simulation response. The measured insertion loss is around —2 dB, and the fractional bandwidth is about 4% to 5%. It is close to the theoretical response.
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