Miniaturized ultra-wideband bandpass filter using bridged-T coil

Wei Ting Fang, Tze Hao Tseng, Yo Shen Lin

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


In this letter, a miniaturized ultra-wideband bandpass filter based on thin-film integrated passive device process is proposed. The multi-mode resonator is adopted to achieve a wide bandwidth from 3.1 to 10.6 GHz. By using the bridged-T coil to replace the transmission line of multi-mode resonator, the circuit size is largely reduced while the multi-mode property can be retained. The filter size without pads is 2.21 mm$\,\times \,$1.04 mm, which is only about $0.050 \lambda-{{{0}}} \times 0.024 \lambda-{{{0}}} $ at the center frequency of 6.85 GHz. To our knowledge, this is the smallest multi-mode resonator filter ever published.

Original languageEnglish
Article number6777364
Pages (from-to)367-369
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number6
StatePublished - Jun 2014


  • Bandpass filter (BPF)
  • bridged-T coil
  • integrated passive device
  • multi-mode resonator
  • ultra-wideband (UWB)


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