Design of a Compact Quad-Channel Microstrip Diplexer for L and S Band Applications

Sobhan Roshani; Salah I Yahya; Yaqeen Sabah Mezaal; Muhammad Akmal Chaudhary; Aqeel A Al-Hilali; Afshin Mojirleilani; Saeed Roshani

doi:10.3390/mi14030553

Design of a Compact Quad-Channel Microstrip Diplexer for L and S Band Applications

Micromachines (Basel). 2023 Feb 26;14(3):553. doi: 10.3390/mi14030553.

Authors

Sobhan Roshani¹, Salah I Yahya^{2

3}, Yaqeen Sabah Mezaal⁴, Muhammad Akmal Chaudhary⁵, Aqeel A Al-Hilali⁶, Afshin Mojirleilani¹, Saeed Roshani¹

Affiliations

¹ Department of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah 6718997551, Iran.
² Department of Communication and Computer Engineering, Cihan University-Erbil, Erbil 44001, Iraq.
³ Department of Software Engineering, Faculty of Engineering, Koya University, Koya KOY45, Iraq.
⁴ Medical Instrumentation Engineering Department, Al-Esraa University College, Baghdad 10011, Iraq.
⁵ Department of Electrical and Computer Engineering, College of Engineering and Information Technology, Ajman University, Ajman 346, United Arab Emirates.
⁶ College of Medical Techniques, Al-Farahidi University, Baghdad 10011, Iraq.

Abstract

In this paper, two novel dual-band bandpass filters (BPFs) and a compact quad-channel diplexer working at 1.7/3.3 GHz and 1.9/3.6 GHz are proposed. In the proposed diplexer design, triangular loop resonators and rectangular loop resonators are used together to reduce the circuit size and improve diplexer performances. Insertion loss (IL) and return loss (RL) of the proposed diplexer are better than 0.8 dB and 21 dB, respectively, at these four operating frequencies. Output ports isolation parameter is better than 30 dB. With the achieved specifications, the proposed diplexer can be used in L and S band applications.

Keywords: bandpass filter; coupled lines; diplexer; insertion loss; microstrip; quad-channel; resonator; return loss.

Grants and funding

This research received no external funding.