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Title: Compact quasi-elliptic microstrip lowpass filter with wide stopband
Authors: Wang, J.
Xu, L.-J.
Zhao, S.
Guo, Y.-X. 
Wu, W.
Issue Date: 30-Sep-2010
Citation: Wang, J., Xu, L.-J., Zhao, S., Guo, Y.-X., Wu, W. (2010-09-30). Compact quasi-elliptic microstrip lowpass filter with wide stopband. Electronics Letters 46 (20) : 1384-1385. ScholarBank@NUS Repository.
Abstract: A compact microstrip lowpass filter with quasi-elliptic response is proposed. To achieve compact design, both symmetrically loaded radial-shape patches and meandered main transmission line are adopted. To realise the quasi-elliptic response and strengthen the roll-off sharpness for the filter, a coupled capacitor between adjacent radial-shape patches is introduced in interdigital form. Furthermore, the adoption of radial-shape patches and the interdigital structure can introduce both serial and parallel resonance in the circuit. Thus, a wide stopband with 7th harmonic suppression is achieved. A demonstration filter with 3dB cutoff frequency at 1.18GHz has been designed, fabricated and measured. Results show that a relative stopband bandwidth of 132.3 (referred to a suppression degree of 15dB) is obtained while achieving a high figure-of-merit of 11543. © 2010 The Institution of Engineering and Technology.
Source Title: Electronics Letters
ISSN: 00135194
DOI: 10.1049/el.2010.1569
Appears in Collections:Staff Publications

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