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A high selective tri-band bandpass filter with switchable passband states

Published online by Cambridge University Press:  15 August 2019

Anjan Bandyopadhyay
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Durgapur, Durgapur-713209, India
Pankaj Sarkar*
Affiliation:
Department of Electronics and Communication Engineering, North Eastern Hill University, Shillong-793022, India
Tapas Mondal
Affiliation:
Department of Electronics and Communication Engineering, Dr. B C Roy College of Engineering, Durgapur-713206, India
Rowdra Ghatak
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Durgapur, Durgapur-713209, India
*
Author for correspondence: Pankaj Sarkar, E-mail: pankajsarkar111@gmail.com

Abstract

A new class of switchable bandpass filter using PIN diodes is presented in this paper. The design aims at achieving a multistate switchable bandpass filtering characteristics between the passbands centered at 2.4, 3.5, and 5.2 GHz. The proposed filter is designed by assembling two λg/2 open-ended and four short-ended λg/4 uniform impedance resonators. The open-ended resonator generates a fixed passband at 3.5 GHz, whereas the short-ended resonators loaded with PIN diodes are independently controlling the ON and OFF characteristics of the passband centered at 2.4 and 5.2 GHz. The transmission zeros around each passband are produced without employing any additional circuit. The filter sample is fabricated and tested for experimental verification. A good agreement has been observed between EM-simulated and measured results. The designed filter has a compact size of 0.20 λg × 0.15 λg at 2.4 GHz.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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