Notch-Band Implemented UWB Bandpass Filter(<Special Section>Recent Technologies for Microwave and Millimeter-wave Passive Devices)

概要

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In this paper, a notch-band implemented UWB bandpass filter was proposed. The filter was realized by integrating a full ultra-wideband bandpass filter using broadside coupling structure with a band-stop filter using in-line open stub. The in-line open stub was installed in the removed area in the broadside coupled microstrip conductors, which demonstrated a narrow notch-band performance. The proposed filters were designed based on the electromagnetic simulation and fabricated using a wet etching system. Parameter study of length dependence of the notch-band was carried out. The first resonant frequency of the in-line stub appears when the length is approximately equal to one quarter of the guided wavelength. Based on this fact, the notch-band can be adjusted to almost any specified band in the UWB passband. A three-section notch-band implemented filter demonstrated good characteristics: its full frequency band-width form 2.8GHz to 10.2GHz, good insertion loss of 0.6dB and 1.0dB at the centers of the first and second bands respectively, and flat and small group delay of less than 0.40ns over main pass band, and a large attenuation stopband about 55dB at 5.63GHz. A lowpass filter was also introduced in order to improve the out-band performance, by which the measured results show an excellent attenuation better than 30dB from 10.4GHz to 17.8GHz.
社団法人電子情報通信学会の論文
2007-12-01