Compact Wideband Filtering Power Dividers Based on Short-Circuited Stubs
Keywords:
Filtering response, high selectivity, outof-band rejection, power dividerAbstract
A novel circuit is proposed to design filtering power dividers (FPDs) with bandpass filtering responses and out-of-band rejection performances. The presented circuit is constructed of two transmission line sections, four short-circuited sections and one resistor. Based on the introduced novel circuit, FPD1 is designed by selecting transmission line sections and short-circuited sections as quarter-wave transmission lines. The FPD2 is proposed to realize more compact size, enhanced bandpass selectivity and improved out-of-band rejection performance by replacing the quarter-wave transmission lines in FPD1 with dual transmission lines. The corresponding equations are derived to calculate the initial parameter values of FPD1 and FPD2 by adopting even-odd mode method. For verification, two FPDs centered at 2.0 GHz are designed and fabricated. The measured 3-dB fractional bandwidths of FPD1 and FPD2 achieve up to 63.2% and 52.3%, while the measured rejections with the level better than 20 dB extend to 2.4f0 and 4.0f0, respectively.
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References
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