Wideband Bandpass Filters with Wide Stopband and Flat Group Delay
碩士 === 國立交通大學 === 電信工程研究所 === 99 === This thesis uses wideband hybrid ring with short and open stubs to design even and odd mode Chebyshev wideband filters. The characteristics of the wideband filters include wide stopband and flat group delay. The filters in this thesis are operated at central freq...
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| Format: | Others |
| Language: | zh-TW |
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2011
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| Online Access: | http://ndltd.ncl.edu.tw/handle/99386178751100603623 |
| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 99 === This thesis uses wideband hybrid ring with short and open stubs to design even and odd mode Chebyshev wideband filters. The characteristics of the wideband filters include wide stopband and flat group delay. The filters in this thesis are operated at central frequency 3GHz with nearly 100% bandwidth.
According to the synthesized filtering functions and by analyzing the corresponding circuit, the impedance of each transmission line section can be determined. The circuit shows pairs of pure-imaginary transmission zeros that can improve the group delay flatness. Using equivalent circuit designs stepped impedance structure of wideband filters for wide stopband and miniature size. All of the circuits are fabricated on Al2O3 substrate with dielectric constant 9.8 and 15mil thickness. We utilize coplanar waveguide (CPW) structure for 50Ω input and output ports, and use coplanar stripline (CPS) implementation.
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