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A planar compact dual-band bandpass filter using stepped impedance resonator and interdigital capacitor

Published online by Cambridge University Press:  06 October 2011

Pankaj Sarkar
Affiliation:
ECE Department, Institute of Technical Education and Research, Siksha ‘O’ Anusandhan University, Bhubaneswar, Orissa, India
Rowdra Ghatak*
Affiliation:
Microwave and Antenna Research Laboratory, ECE Department, National Institute of Technology Durgapur, Durgapur, West-Bengal, India
Manimala Pal
Affiliation:
ECE Department, NSHM Knowledge Campus, Durgapur-Group of Institutions, Durgapur, West Bengal, India
Dipak Ranjan Poddar
Affiliation:
ETCE Department, Jadavpur University, Kolkata, West Bengal, India
*
Corresponding author: R. Ghatak Email: rowdraghatak@yahoo.com

Abstract

In this paper a dual-band bandpass filter with sharp rejection is proposed. The filter is realized by using two half-wavelength stepped impedance resonators to operate at the passbands 2.5 and 3.5 GHz. To increase the band width further to about 45 MHz at the lower passband and 115 MHz at the higher passband, interdigital capacitors are introduced between resonator and input and output combining network. Measured insertion loss is about 1.45 and 1.7 dB at first and second passbands, respectively. A finite transmission zero in between two passbands at 2.84 GHz is realized to improve the selectivity of the filter. The design procedure to get highly selective response of the proposed filter is explicitly explained. An equivalent circuit model of proposed filter is developed that matches well with measured results.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2011

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References

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