Open AccessCompact bandpass filter with reconfigurable X‐band using stepped impedance resonator and folded structure
Author(s) -
Masood Molimoli Hajamohideen,
Suseela Sreeja Balakrishnapillai
Publication year - 2018
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2017.0796
Subject(s) - band pass filter , microstrip , pin diode , electronic engineering , filter (signal processing) , resonator , telecommunications link , electrical impedance , computer science , materials science , topology (electrical circuits) , optoelectronics , acoustics , diode , electrical engineering , telecommunications , physics , engineering
A reconfigurable X‐band microstrip bandpass filter based on the stepped impedance resonator topology with two folded stubs is proposed. Reconfiguration is enabled in the microstrip filter using positive–intrinsic–negative (PIN) diode and the proposed filter performs frequency switching between uplink and downlink X‐band services. The prototype filter is realised ideally using open‐circuit and short‐circuit conditions that are designed in a way similar to the design using PIN diodes that provide the same results. From the simulation and measured results, it is inferred that by altering the ON/OFF states, the filter can work from downlink frequency range of 7.25–7.9 GHz to the uplink frequency range of 8.00–8.4 GHz. Comprehensive studies are conducted on a fabricated prototype to assess its performance from which encouraging results are obtained.