Cross-coupled hairpin filter design using high-permittivity substrates

Cheng Shing Hsu, Cheng-Liang Huang

Research output: Contribution to journalArticlepeer-review


A four-pole elliptic-function bandpass filter is designed using a compact miniaturized microstrip hairpin resonator. This miniaturized hairpin resonator is realized by using a stepped-impedance structure with parallel coupled lines. In addition, the bandpass filter is implemented using a high-permittivity ceramic substrate. These factors result in the reduction of the filter's size. The full-wave simulator IE3D is used to design the hairpin resonator, and to calculate the coupling coefficient of the basic coupling strictures. The responses of the fabricated filters using Al2O3r = 9.7, Q × f = 350,000 GHz) and MgNb2O 6r = 20, Q × f = 110,000 GHz) ceramic substrates are designed at a center frequency of 2 GHz. The compact size and the performance of this class of filters are demonstrated.

Original languageEnglish
Pages (from-to)419-423
Number of pages5
JournalMicrowave and Optical Technology Letters
Issue number5
Publication statusPublished - 2004 Jun 5

All Science Journal Classification (ASJC) codes

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


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