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2013-11-21
Compact LPF with Sharp Roll off and Wide Stopband Using Coupling Stepped Impedance Triangular Resonator
By
Progress In Electromagnetics Research Letters, Vol. 44, 29-34, 2014
Abstract
A lowpass filter with sharp transition and wide stopband using a novel coupling stepped-impedance triangular resonator is presented. The L-C equivalent circuit is developed for designing this type filter and analyzing the mechanism for improving roll-off and rejection property. The stopband width, passband edge, roll-off rate and overall suppression level are affected by coupling capacitance. The effect of coupling capacitance is analyzed using calculated frequency response. Coupling triangular stubs provide adequate coupling capacitance resulting in balance among transition property, stopband width and suppression level easily. A single LPF unit is designed and fabricated with cutoff frequency of 860 MHz. The single LPF unit exhibits 40-dB suppression level from 1.11 GHz to 2.28 GHz. A cascaded LPF with three asymmetric units provides 40-dB suppression level from 1.1 GHz to 6.76 GHz, and roll-off rate of 154 dB/GHz with compact size as small as 0.23λg × 0.05λg, where λg is guided wavelength at cutoff frequency.
Citation
Zebao Du Hao Yang Haiying Zhang Min Zhu , "Compact LPF with Sharp Roll off and Wide Stopband Using Coupling Stepped Impedance Triangular Resonator," Progress In Electromagnetics Research Letters, Vol. 44, 29-34, 2014.
doi:10.2528/PIERL13102203
http://www.jpier.org/PIERL/pier.php?paper=13102203
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