Vol. 97

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2021-03-15

Design of a Compact Lowpass-Bandpass Diplexer with High Isolation

By Seda Elden and Ali Kursad Gorur
Progress In Electromagnetics Research Letters, Vol. 97, 21-26, 2021
doi:10.2528/PIERL21012701

Abstract

In this paper, a novel compact lowpass-bandpass microstrip diplexer with high isolation is proposed. The proposed structure consists of a lowpass filter section and a bandpass filter section. The lowpass filter section is designed at a cut-off frequency of 2 GHz with sixth order elliptic filtering characteristics. The bandpass filter section is designed at 3.5 GHz by using a meandered dual-mode loop resonator (MDMLR). The MDMLR is coupled to input port by open circuited feeding lines. The lowpass-bandpass diplexer is formed by combining lowpass and bandpass filter sections without using an additional matching circuit. The designed lowpass-bandpass diplexer has been fabricated and measured in a very good agreement with the simulated results. Isolation between the output ports has been measured as better than 40 dB.

Citation


Seda Elden and Ali Kursad Gorur, "Design of a Compact Lowpass-Bandpass Diplexer with High Isolation," Progress In Electromagnetics Research Letters, Vol. 97, 21-26, 2021.
doi:10.2528/PIERL21012701
http://www.jpier.org/PIERL/pier.php?paper=21012701

References