In this paper, we have proposed a new type of dual band filter consisting of microstrip comb-line resonators with a single common I/O microstrip. The filtering characteristics have been investigated through numerical simulations by means of the FD-TD method. It has been shown that desirable filtering characteristics which have attenuation poles below and above either of two passbands can be realized. For a practical application to wireless LAN systems, we have designed the filter that has two passbands at 2.4GHz and 5.0GHz and investigated the filtering characteristics through both numerical simulations and experiments, obtaining satisfactory results. At the next stage, we would like to design this type of filter with more compact sizes in a folded structure.
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