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Design of Quasi-Elliptic Filter with Source-Load Cross-Coupling |
Zhu Yong-zhong; Xie Yong-jun; Ni Da-ning |
National Laboratory of Antennas and Microwave Technology, Xidian University, Xi’an 710071, China |
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Abstract A general method is presented for synthesis of quasi-elliptic filter with source-load coupling. The equivalent circuit of the low-pass prototype of a lossless coupled resonator filter is proposed, as well as its transfer function t (s ).The expressions of MSL, MSi and MiL in the coupling matrix M are obtained based on two-port admittance matrix [ YN ]. Finally, a novel quasi-elliptic two pole microstrip filter composed of two hexagonal open-loop resonators is designed. The numerical results are verified with the simulation, The measured and simulated data are in good agreement.
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Received: 22 March 2007
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