Design of LTCC Filters Using a Cross Patch(Passive(Filter))(<Special Issue>Recent Trends on Microwave and Millimeter Wave Application Technology)

概要

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A conventional waveguide filter is usually composed of a waveguide which is set with irises and posts inside. When dielectric material is not loaded inside the filter, the filter is too large to mount it on a planar circuit even if the frequency band is as high as the millimeter-wave band. In this paper, we propose a dielectric waveguide filter using LTCC (Low-Temperature Co-fired Ceramics) which can be mounted on a planar circuit. The dielectric waveguide filter using LTCC is composed of a dielectric-loaded waveguide including posts (via holes) and TEM-TE_<10> converters. The design method of the filter is shown and comparison of the simulated and the experimental results in the 6GHz band is demonstrated. The simulated results agreed well with the experimental ones. To improve the attenuation characteristics, particularly at the above pass-band frequencies, an attenuation pole is added using a cross patch set inside the LTCC filter in the 25GHz band. The effect of the cross patch is confirmed using the same simulation method as used for the 6GHz band. As a result, it is confirmed that the cross patch is very useful for improving the attenuation characteristics at the above pass-band frequencies.
社団法人電子情報通信学会の論文
2003-12-01