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2013-08-19

Design of Even-Order Symmetric Bandpass Filter with Chebyshev Response

By Kai Wang, Li-Sheng Zheng, Sai Wai Wong, Yu-Fa Zheng, and Qing-Xin Chu
Progress In Electromagnetics Research C, Vol. 42, 239-251, 2013
doi:10.2528/PIERC13071706

Abstract

This paper proposes a method to design an even-order symmetric bandpass filter with Chebyshev response. The alternative J inverters and λ/4 short-ended resonators are used in the filter design. It is well known that a conventional even-order Chebyshev bandpass filter prototype can be designed by using J-inverters. However, to achieve the Chebyshev response, a problem is that the output admittance YL is unequal to the input admittance Y0 since normalized gn+1 is not equal to the g0. But for the symmetrical structure, an additional impedance transform can be installed at the output port to solve this problem, thus the network of even-order symmetric bandpass filter with a Chebyshev response should be modified with new J-inverters. In this work, all J-inverters of the symmetric bandpass filter with Chebyshev response are extracted and described as curves to determine the circuit dimensions of the proposed structure. Two even-order Chebyshev bandpass filters with the second- and fourth-order are designed with the proposed method as its application examples. Finally, the fourth-order filter is fabricated and measured at center frequency of 2.5 GHz with the fractional bandwidth 25%. The measured result is in good agreement with the simulated one.

Citation


Kai Wang, Li-Sheng Zheng, Sai Wai Wong, Yu-Fa Zheng, and Qing-Xin Chu, "Design of Even-Order Symmetric Bandpass Filter with Chebyshev Response," Progress In Electromagnetics Research C, Vol. 42, 239-251, 2013.
doi:10.2528/PIERC13071706
http://jpier.org/PIERC/pier.php?paper=13071706

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