Abstract

Design of a compact band pass filter using parallel-coupled half-wavelength microstrip resonators with improved stopband skirt characteristics and harmonic suppression is presented in this paper. The proposed filter has fractional bandwidth of 20% subject to design frequency of 5.25 GHz for WLAN applications. Periodic triangular corrugations have been employed in each coupled section of parallel lines for suppression of 2nd harmonic. Accordingly, 2nd harmonic suppression of 62.45dB and size reduction of 63% is achieved compared to the conventional parallel-coupled bandpass filter.

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