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J. Electromagn. Eng. Sci > Volume 11(2); 2011 > Article
Journal of the Korean Institute of Electromagnetic and Science 2011;11(2):83-90.
DOI: https://doi.org/10.5515/JKIEES.2011.11.2.083   
Design of Low-Pass Type Inverter: UWB Band-Pass Filter with Low Spurious Characteristics
Young-Ho Cho, Moon-Gyu Choi, Sang-Won Yun
Department of Electronic Engineering, Sogang University
In this paper, we present the design method for a low-pass type inverter, which can effectively suppress the spurious response associated with band-pass filters. The inverter has a length of ${lambda}/4$ and employs not only a stepped-impedance configuration but also asymmetrical and bending structures in order to improve frequency selectivity and compactness. The inverter is applied as an impedance/admittance inverter to the ultra-wideband (UWB) band-pass filter. The UWB band-pass filter configuration is based on a stub band-pass filter consisting of quarter-wavelength impedance inverters and shunt short-circuited stubs ${lambda}/4$ in length. The asymmetrical stepped-impedance low-pass type inverter improves not only the spurious responses, but also the return loss characteristics associated with a UWB band-pass filter, while a compact size is maintained. The UWB band-pass filter using the proposed inverters is fabricated and tested. The measured results show excellent attenuation characteristics at out-band frequencies, which exceed 18 dB up to 39 GHz. The insertion loss within the pass-band (from 3.1 to 10.6 GHz) is below 1.7 dB, the return loss is below 10 dB, and the group delay is below 1 ns.
Key words: Stepped-Impedance Low-Pass Type Inverter, Ultra-Wideband, Quarter-Wave Stubs, Wideband Filter
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