access icon free Wideband balun bandpass filter with broadside-coupled microstrip/slotline resonator structure

In this Letter, a new design scheme for wideband balun bandpass filter (BPF) is presented originating from the conventional Marchand-type balun prototype. The designed balun BPF is basically composed of three microstrip lines on the top side of the substrate and two half-wavelength slotline resonators etched in the ground plane. A distinctive wideband performance is attained by utilising the broadside coupling between these microstrip lines and slotline resonators. For demonstration, one fabricated prototype balun BPF operating at 3.75 GHz shows a broad bandwidth of 93% with nice in-band balanced performance. Final results from simulation and experiment are both recorded in good agreement.

Inspec keywords: microstrip resonators; microwave resonators; coupled circuits; slot lines; band-pass filters; microwave filters; baluns; microstrip lines; etching

Other keywords: half wavelength slotline resonator; etching; broadside-coupled microstrip-slotline resonator structure; Marchand-type balun prototype; wideband balun bandpass filter; frequency 3.75 GHz; BPF

Subjects: Microwave circuits and devices; Waveguide and microwave transmission line components; Waveguides and microwave transmission lines; Filters and other networks

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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.2835
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content/journals/10.1049/el.2017.2835
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