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In this paper, a new design of a compact narrowband bandpass fllter is proposed. This new narrowband bandpass fllter is designed using an octagonal form of dual-mode closed-loop microstrip ring resonator based on a meander structure in order to achieve compactness. The designed fllter has a 3dB fractional bandwidth (FBW) of 5% at 2.3GHz. The fllter has been fabricated on Taconic CER-10 substrate having 0.64mm thickness and a relative dielectric constant of 10. Experimental results show good agreement with simulated values. Apart from WiMax, this new model of fllter is also useful for WLAN and mobile communication applications, since it is compact in size, low loss, and low cost with good performance of elliptic response with sharp rejection and adequate fractional bandwidth.

COMPACT NARROWBAND BANDPASS FILTER USING DUAL-MODE OCTAGONAL MEANDERED LOOP RESONATOR FOR WIMAX APPLICATION