H. Kubo et al., ANALYSIS OF DIELECTRIC E-PLANE WAVE-GUIDES AND DESIGN OF FILTERS, IEEE transactions on microwave theory and techniques, 46(8), 1998, pp. 1085-1090
A small-size waveguide made of high-permittivity ceramic is analyzed,
The propagation constants are calculated approximately by an approach
where the electromagnetic fields outside the waveguide are fully taken
into consideration. The analysis values agree well with the experimen
tal values. The constants of equivalent circuit for the metallic strip
section are obtained by using a separate model for the analysis of th
e structure. Based on these results, bandpass filters (BPF's) are desi
gned and fabricated. The fabricated BPF's have better transmission and
reflection characteristics than those designed on the basis of a trou
gh-guide model.