Realization of attenuation poles, spurious resonance suppression and size reduction by microstrip SIR loaded with dielectric rods

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

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Characteristics of a class of stepped-impedance resonators (SIRs) which is loaded with two dielectric rods, are investigated by a Finite-Difference Time-Domain (FDTD) method. Dielectric rods to be inserted between a strip conductor and the ground plane have higher relative permittivity than that of the substrate. When a tapped half-wavelength (λ/2) microstrip resonator is loaded with two dielectric rods, the electric length of a loaded λ/2 resonator becomes longer than λ/2, which makes its fundamental resonant frequency (fr′) to be generated on the region lower than that of an unloaded λ/2 resonator (fr) and its first spurious response (fsp1) is generated on the region higher than 2f r′. Therefore, to shift fr′ back to f r, the resonator's length is to be reduced, and this, in turns, suppress the spurious responses. Then, the resonant characteristics of an SIR employing the proposed method has also been investigated, and it is found that this is capable of suppressing the spurious responses in wideband together with an attenuation pole in the stopband, and of further reducing the resonator's length. Therefore, wide exploitation of the presented method can be expected in the filter design based on the LTCC technique.

Original languageEnglish
Pages (from-to)2302-2308
Number of pages7
JournalIEICE Transactions on Electronics
VolumeE88-C
Issue number12
DOIs
Publication statusPublished - Dec 2005

All Science Journal Classification (ASJC) codes

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

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