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Abstract
In this paper a harmonic suppressed tunable bandpass filter is proposed. Generally, tuning of filter not only tunes the passband but also shifts the harmonic bands that make the out-of-band suppression complicated. To eliminate this problem H-shaped defected ground structures are incorporated at the input/output feed line without affecting the passband performance. The proposed filter is designed and fabricated on a low-cost FR4 substrate. The measured results show that passband frequency can be tuned from a frequency of 0.92 to 1.2 GHz with more than 13.6 dB harmonic suppression up to 6 GHz. Measured and simulated results show a good agreement.
Additional information
Notes on contributors
Biswajit Pal
Biswajit Pal is a research scholar in the Department of Electronics Engineering, IIT (ISM), Dhanbad, India. Currently, he is doing research on frequency reconfigurable microstrip filters. Biswajit Pal received BSc in physics, and BTech, MTech in electronics and communication engineering from Calcutta University, India. Corresponding author Email: [email protected]
Santanu Dwari
Santanu Dwari is an associate professor in the Department of Electronics Department, IIT (ISM), Dhanbad, India. His research interests are microstrip filters, patch antennas, SIW antennas, and multiband antennas. Email: [email protected]