Kenji Endou

TEM-mode planar dielectric waveguide resonator BPF for W-CDMA

A low-profile TEM-mode silver-coated /spl lambda//4 high dielectric (/spl epsi//sub r/=93) planar waveguide resonator having a dimensions of 4.25/spl times/3/spl times/1 (mm) with unloaded quality factor of /spl cong/240 have been devised at the resonant frequency of 2 GHz. Two types (with and without attenuation poles at the both sides of the pass band) of low-profile and high performance 2-pole BPFs are designed and fabricated using two such physical resonators, each of which have dimensions of /spl cong/9/spl times/3/spl times/1 (mm). A precise design procedure is also described.

Control of Attenuation Pole Frequencies and Miniaturization of a Two-Pole λ/4 Tem-Mode Planar Dielectric Waveguide Bandpass Filter

Theoretical explanation for the appearance of attenuation poles at the both sides of the passband of a two-pole λ/4 TEM-mode planar dielectric waveguide bandpass filter is lucidly described with equivalent circuit representation. Control of the appeared attenuation poles is described theoretically and justified by experimental result. Keeping the electrical performance of the BPF almost unchanged, the miniaturization technology with increased mechanical strength of the planar BPF structure is proposed and verified by experiment.