Compact differential bandpass filter with a narrow notched band using APCL structure suitable for UWB application |
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| Affiliation: | 1. UMR1282, Infectiologie et Santé Publique (ISP-311), INRA Centre Val de Loire, F-37380 Nouzilly, France;2. Groupement de Défense Sanitaire de la Région Centre (GDS Centre), 4 rue Robert Mallet Stevens BP 501, F-36018 Châteauroux, France;3. Institut Pasteur, Unité de Chimie des Biomolécules, Département de Biologie Structurale et Chimie, 75015 Paris, France;4. CNRS UMR 3523, 75015 Paris, France;5. Laboratoire Départemental d''Analyse et de Recherche de Dordogne, 161 av Winston Churchill, 24660 Coulounieix Chamiers, France |
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| Abstract: | A compact differential band pass filter with asymmetric parallel-coupled lines (APCL) and center frequency of 5.6 GHz is proposed in this paper. The APCL suppresses unwanted RFID signals by introducing a fully tunable notched band at 6.8 GHz. By combining the concept of transmission matrix with modal analysis and extracting a novel model for symmetric three parallel coupled lines (SPCL), role of each resonant frequency is clearly explained. Measurement results in the differential mode show a pass band from 3.1 to 8.1 GHz and a wide stop band from 9.1 to 16 GHz with attenuation of more than 20 dB. In addition, S21 in common mode is lower than −10.5 dB over the pass band. |
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| Keywords: | Differential bandpass filter Asymmetric parallel-coupled lines Notch band Common mode suppression Ultra-wideband |
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