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A compact UWB band-pass filter with a notch band using multi-mode stub-loaded resonators (MM-SLR)

Published online by Cambridge University Press:  22 February 2018

Gholamreza Karimi*
Affiliation:
Electrical Engineering Department, Faculty of Engineering, Razi University, Kermanshah, Iran
Fatemeh Javidan
Affiliation:
Department of Electrical Engineering, College of Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran Department of Electrical Engineering, College of Engineering, Kermanshah Science and Research Branch, Islamic Azad University, Kermanshah, Iran
Amir Hossein Salehi
Affiliation:
Department of Electrical Engineering, College of Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran Department of Electrical Engineering, College of Engineering, Kermanshah Science and Research Branch, Islamic Azad University, Kermanshah, Iran
*
Author for correspondence:: Gholamreza Karimi, E-mail: ghkarimi@razi.ac.ir

Abstract

In this paper, an ultra-wideband (UWB) band-pass filter (BPF) with a sharp notch band is presented. The UWB BPF consists of modified elliptical-ring and multi-mode stub-loaded resonator (MM-SLR). By adding the asymmetric tight coupled lines resonator via input/output (I/O) lines, it can be achieved UWB band-pass response. With adding two bends to the middle resonator, a notch band at 6.86 GHz is created, so that it can be controlled using the mathematical formulas (MF). In the meantime, the equivalent circuit of the middle resonator is obtained using L–C analysis. Measured results of fabricated filter have the advantage such as ultra-wide pass band (fl and fH of the defined UWB pass band are 3.776 and 10.42 GHz, which satisfy the requirements of FCC-specified UWB limits), compact size, low insertion loss <0.65 dB and the stop band of the proposed filter is from 11.1 to 16.32 GHz with attenuation of −39.8 to −42.14 dB, respectively. The proposed UWB filter is realized using the substrate with dielectric constant of 2.2 and substrate height of 0.787 mm. Experimental verification is provided and good agreement has been found between simulation and measurement results.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2018 

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