Miniaturization of hairpin bandpass filters using high-permittivity substrate

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The miniaturization of hairpin bandpass filters by employing two high-permittivity ceramic substrates (with respective dielectric constants of 9.7 and 20) are investigated. Microwave dielectric ceramics with high permittivity are commonly applied in several microwave communication components. With the advantages of compact size, high-permittivity ceramics can be used as the substrate for bandpass filters. Moreover, the fundamental characteristics of newly developed compact stepped-impedance hairpin resonators with parallel coupled lines have also been described and applied to the design of bandpass filters. In this paper, the designed mixed-coupled structures are simulated using an IE3D simulator. The responses of the fabricated filters using Al 2O3r = 9.7, Q × f = 350000 GHz) and MgNb2O6r = 20, Q × f = 110000 GHz) ceramic substrates are designed at a center frequency of 2 GHz. The compact size and performance of this class of filters are demonstrated.

Original languageEnglish
Pages (from-to)222-225
Number of pages4
JournalMicrowave and Optical Technology Letters
Issue number3
Publication statusPublished - 2005 May 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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