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2009-12-16
Design of the Compact Parallel-Coupled Lines Wideband Bandpass Filters Using Image Parameter Method
By
Progress In Electromagnetics Research, Vol. 100, 153-173, 2010
Abstract
In this paper, the design of compact and high performance parallel coupled line wideband bandpass filter using image parameter method are proposed. The filter mainly comprising one-stage parallel coupled line and two open stubs are designed and implemented on commercial RT/Duroid 5880 substrate. The equivalent circuit of the proposed structure is initially derived by using the image parameter method. It is found that, the normalized bandwidth (NBW) of image impedance for the one-stage parallel coupled line has a relation to the electromagnetic (EM) simulated bandwidth. To further improve the selectivity, two open stubs are connected near the input/output (I/O) ports. The design procedures and their limitations are discussed in detail. The proposed filters are fabricated, measured and showing good characteristics of 87% fractional bandwidth as well as good insertion/return loss, flat group delay varies between 0.3-1.5 ns. High passband selectivity and wide stopband from 8-14 GHz are obseved. The measured results are also having a good agreement with the simulated results.
Citation
Chang-Sin Ye Yan-Kuin Su Min-Hang Weng Cheng-Yuan Hung Ru-Yuan Yang , "Design of the Compact Parallel-Coupled Lines Wideband Bandpass Filters Using Image Parameter Method," Progress In Electromagnetics Research, Vol. 100, 153-173, 2010.
doi:10.2528/PIER09073002
http://www.jpier.org/PIER/pier.php?paper=09073002
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