New Miniature Narrow Band Microstrip Diplexer for Recent Wireless Communications

Author:

Al-Majdi Kadhum1,Mezaal Yaqeen Sabah2

Affiliation:

1. Medical Instrumentation Engineering Department, Ashur University College, Baghdad 10071, Iraq

2. Medical Instrumentation Engineering Department, Al-Esraa University College, Baghdad 10071, Iraq

Abstract

Using Kappa substrate material, a compact microstrip diplexer is developed in this research with two separate channels based on the coupled junction and two bandpass filters functioning in independent frequency bands. Each filter comprises an input/output feed line and a number of resonators with different impedances. The diplexer’s frequency response was modeled and optimized using the Sonnet EM solver. At 2.84 and 4.08 GHz for TX/RX channels, the insertion loss is better than 1 dB for both channels, while the return loss values are 21.2 and 17 dB for transmit and receive filters, respectively. The microstrip diplexer has miniature dimensions of 24 mm × 18 mm with highly narrow bands and band isolation of more than 35 dB. The simulated scattering parameters are in agreement with the measured ones.

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Computer Networks and Communications,Hardware and Architecture,Signal Processing,Control and Systems Engineering

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