Year: 2013
Type: article
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 Jinverters. 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. Thus, 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 2.5GHz with the fractional bandwidth 25%. The measured result is in good agreement with the simulated one.
Authors: Kai Wang, Li-Sheng Zheng, Sai Wai Wong, Yu-Fa Zheng, Qing-Xin Chu
Institution: South China University of Technology
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
Award: 超宽带滤波器综合理论与新型结构研究
OpenAlex ID: W2145661292