Bandwidth reconfigurable microwave filter using stepped impedance c‐shaped resonator. Issue 2 (3rd September 2020)

• Record Type: Journal Article
• Authors: Kingsly, Saffrine; Kanagasabai, Malathi; Mohammed, Gulam Nabi Alsath; Thirunavukkarasu, Manimekalai; Subbaraj, Sangeetha; Palaniswamy, Sandeep Kumar; Bilvam, Sridhar; Kulandhaisamy, Indhumathi
• Is Part Of: Microwave and optical technology letters. Volume 63:Issue 2(2021)
• Page Start: 432
• Page End: 436
• Publication Date: 2020-09-03
• Subjects: bandwidth reconfiguration -- microstrip filter -- reconfigurable filter; Microwaves -- Periodicals; Optics -- Periodicals; 621
• DOI: 10.1002/mop.32616
• Languages: English
• ISSNs: 0895-2477

Abstract

Abstract: This article presents a compact reconfigurable filter performing bandwidth reconfiguration covering the entire L‐band frequency range. The reconfigurable filter is developed using a C‐shaped resonator coupled to the source and load through varactor diodes. To reverse bias the diodes symmetrically both the diodes are fed with a common bias voltage. Hence the DC bias voltage is administered evenly to the diodes resulting is equi‐proportional coupling between the resonator and the nodes. This results in reconfiguring the bandwidth of the operating frequency. The designed filter is capable of tuning 3‐dB bandwidth from 0.613 to 1.353 GHz with the center frequency as 1.5 GHz. The percentage bandwidth of the filter is varied from 44.5% to 91.76%. The insertion loss offered by the filter is very less with the minimum value of 0.42 dB. The proposed filter is simple, compact and finds it application in power agile systems operating with different transmission power levels at different time instances.