A method for LTCC resonators to realize improved-resonant characteristics on reduced-size microstrip structure

Ramesh K. Pokharel, Kouji Wada, Osamu Hashimoto, Takeshi Takahashi

Research output: Contribution to journalArticlepeer-review


This paper presents a new method to improve the resonant characteristics of a microstrip resonator. The improved characteristics have ' been achieved by inserting two dielectric rods between strip conductor and the ground plane. Dielectric rods to be inserted have higher relative permittivity than that of the substrate. Therefore, it is suitable to realize by Low-Temperature Cofired Ceramics (LTCC) technique. Several model of microstrip resonators employing the proposed method are analyzed by a Finite-Difference Time-Domain (FDTD) method, and their resonant characteristics are discussed. One of the advantages of the proposed method is that an attenuation pole (fi or fh,) in each side of the fundamental resonant frequency (fr) and improved-spurious responses can be realized together by a capacitive-coupling tapped resonator loaded with dielectric rods. The proposed method is also effective to achieve sharp skirt characteristics and wide stopband of a direct-coupling tapped resonator which can be used either as a wideband lowpass filter or a band-elimination filter. Another interesting feature of the analyzed resonators is that about 60% reduction in resonator's length has been obtained compared to a basic half-wavelength (λ/2) microstrip resonator. Therefore, wide exploitation of the proposed method can be expected in the filter design based on the LTCC technique.

Original languageEnglish
Pages (from-to)1517-1523
Number of pages7
JournalIEICE Transactions on Electronics
Issue number9
Publication statusPublished - Sept 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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