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

Feng Huang, Jianpeng Wang*, Jia-Sheng Hong, Wen Wu

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review

13 Citations (Scopus)


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 halfwavelength 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.

Original languageEnglish
Pages (from-to)1320-1321
Number of pages2
JournalElectronics Letters
Issue number19
Early online date23 Aug 2017
Publication statusPublished - 21 Sept 2017

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


Dive into the research topics of 'Wideband balun bandpass filter with broadside-coupled microstrip/slotline resonator structure'. Together they form a unique fingerprint.

Cite this