High-Selectivity Wideband Bandpass Filter Using Simple Coupled Lines with Multiple Transmission Poles and Zeros

Publication Type:
Journal Article
IEEE Microwave and Wireless Components Letters, 2019, 29 (2), pp. 107 - 109
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© 2001-2012 IEEE. A compact fifth-order wideband bandpass filter (BPF) using simple coupled lines with sharp rolloff skirts is proposed in this letter. Five transmission poles within the passband and eight deep transmission zeros from 0 to 2\!f-{0} ( f-{0} denotes the center frequency of the passband) can be realized through input impedance calculations. For demonstration, a wideband BPF prototype centered at 2.05 GHz with high-stopband rejection is designed and fabricated, whose measured 3-dB fractional bandwidth is of 60% (1.44-2.66 GHz). Good agreement between the simulations and measurements validates the design idea.
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