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Switchable bandpass filter using CRLH cells based on a new kind of admittance inverter

Published online by Cambridge University Press:  07 April 2016

Samaneh Keshavarzi  and
Zahra Atlasbaf
Samaneh Keshavarzi*
Affiliation:
Faculty of Electrical Engineering, Tarbiat Modares University, Tehran 14115-143, Iran
Zahra Atlasbaf*
Affiliation:
Faculty of Electrical Engineering, Tarbiat Modares University, Tehran 14115-143, Iran
*
Corresponding authors:S. Keshavarzi and Z. Atlasbaf Email: atlasbaf@modares.ac.ir; s.keshavarzi@modares.ac.ir
Corresponding authors:S. Keshavarzi and Z. Atlasbaf Email: atlasbaf@modares.ac.ir; s.keshavarzi@modares.ac.ir
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Abstract

In this paper, a new kind of admittance inverter and design of a switchable microstrip bandpass filter using composite right/left-handed (CRLH) cells has been presented. The proposed filter has two states (or passbands). One of the two passbands, is accessible at each time by on/off state of three PIN diodes. This filter is a three-pole, coupled resonator filter, composed of short-circuited shunt resonators. These resonators are coupled using admittance inverters. With regard to the characteristics of the equivalent circuit of CRLH cells, a new structure of admittance inverter (J-inverter) has been introduced. This novel J-inverter has PI-section equivalent circuit and it consists of both inductive and capacitive elements. In our work, the proposed J-inverter was mathematically studied and the switchable filter was simulated and implemented. The results of simulations for the first and second state of the filter, which are frequency bands of (Δ1 = 0.11 and f1 = 1.26 GHz) and (Δ2 = 0.12 and f2 = 1.5 GHz), are verified by measurements.

Keywords

Admittance inverterReconfigurable bandpass filterSwitchable dual mode filterMetamaterialsCRLH cellsCoupled resonatorShunt resonatorBias networks
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Issue 1 , February 2017 , pp. 61 - 69
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2016 

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