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2020-09-01

A Novel Miniaturized UWB Bandpass Filter Basing on E-Shaped Defected Microstrip Structure

By Lichang Huang, Minquan Li, Ping-Juan Zhang, Kaiyue Duan, and Yawen Song
Progress In Electromagnetics Research Letters, Vol. 93, 49-57, 2020
doi:10.2528/PIERL20062601

Abstract

This paper proposes a novel miniaturized UWB bandpass filter by cascading two miniaturized low-pass and high-pass modules. On account of the slow wave and stopband characteristic of defected microstrip structure (DMS), an E-shaped DMS with low-pass characteristic is presented, and an RLC equivalent circuit is utilized to analyze it. By three-dimensional electromagnetic modeling , the S parameters can be obtained to extract the initial parameter values of the RLC equivalent circuit and verify the validity of equivalent circuit in Advanced Design System. The high-pass module uses a lump element to reduce the circuit dimension. The high frequency selectivity can be achieved by loading L-shaped stubs, which produces one transmission zero at the upper band of passband and has a good rectangle coefficient of 1.2 (25 dB-bandwidth/3 dB-bandwidth). To verify the idea, a compact UWB bandpass filter is simulated and fabricated. The result shows that the passband range is 3.1-10.6 GHz with 1 dB loss, and the measurement has a good agreement with the simulation. Besides, a notched wave working in X wave band can also be generated. Compared with the previous works, this UWB bandpass filter has the advantages of miniature and high selectivity.

Citation


Lichang Huang, Minquan Li, Ping-Juan Zhang, Kaiyue Duan, and Yawen Song, "A Novel Miniaturized UWB Bandpass Filter Basing on E-Shaped Defected Microstrip Structure," Progress In Electromagnetics Research Letters, Vol. 93, 49-57, 2020.
doi:10.2528/PIERL20062601
http://www.jpier.org/PIERL/pier.php?paper=20062601

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