Compact cascaded quadruplet bandpass filter using artificial magnetic resonators

Tae Hak Lee, Jung Woo Baik, Young Sik Kim

Research output: Contribution to journalArticle

4 Citations (Scopus)


A compact cascaded quadruplet (CQ) bandpass filter (BPF) using artificial magnetic resonators is proposed in this letter.An artificial magnetic resonator, which has a negative effective permeability at the resonant frequency, consists of a shorted spiral structure. The negative-mu characteristics are extracted from the simulation result of the scattering parameters in a fictitious rectangular waveguide. Compared with the open-loop resonators that are usually used to construct conventional CQ-BPFs, the proposed artificial magnetic resonator achieves about an 80% size reduction ratio. The measured insertion and return losses at a center frequency of 2.14 GHz are approximately 1.83 dB and 21 dB, respectively. The group delay is less than 0.81 ns in the W-CDMA passband. The full-wave simulation results are in good agreement with the measurement results.

Original languageEnglish
Pages (from-to)883-886
Number of pages4
JournalMicrowave and Optical Technology Letters
Issue number4
Publication statusPublished - 2013 Apr 1



  • bandpass filter
  • cascaded quadruplet
  • negative-mu
  • spiral resonator

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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