An Ultra-Wideband (UWB) Bandpass Filter Using Broadside-Coupled Structure and Lumped-Capacitor-Loaded Shunt Stub Resonators(Passive Devices/Circuits,<Special Section>Microwave and Millimeter-Wave Technology)
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概要
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This paper presents an ultra-wideband (UWB) bandpass filter using a combination of broadside-coupled structure and lumped-capacitor-loaded shunt stub resonator. The broadside-coupled microstrip-to-coplanar waveguide structure provides an ultra-wide bandpass filtering operation and keeps a good stopband at lower frequencies from DC at the same time. The lumped-capacitor-loaded shunt stub resonator creates two transmission zeros (attenuation poles which can be located at the outsides of the two bandedges of the UWB bandpass filter to improve the out-band performance by selecting a suitable combination of the length of the shunt stubs and the capacitance of the loaded chip capacitors. The filter was designed based on electromagnetic simulation for broadside-coupled structure, microwave circuit simulation and experiments for determining the transmission zeros. The filter was fabricated on a one-layer dielectric substrate. The measured results demonstrated that the developed UWB bandpass filter has good performance: low insertion loss about 0.46dB and low group delay about 0.26ns at the center of the passband and very flat over the whole passband, and less than -10dB reflection over the passband. The implemented transmission zeros, particularly at the low frequency end, dramatically improved the out-band performance, leading the filter satisfy the FCC's spectrum mask not only for indoor but also for outdoor applications. These poles improved also the skirt performance at both bandedges of the filter. A lowpass filter has been also introduced and integrated with the proposed bandpass filter to have a further improvement of the out-band performance at the high frequency end. The filters integrated with lowpass section exhibit excellent filter performance: almost satisfying the FCC's spectrum mask from DC to 18GHz. The developed UWB bandpass filter has a compact size of 4cm×1.5cm, or 4.8cm×1.5cm with lowpass section implemented.
- 社団法人電子情報通信学会の論文
- 2007-09-01
著者
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Li Keren
NICT
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Li Keren
National Inst. Of Information And Communications Technol.
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Li Keren
National Institute Of Information And Communications Technology (nict)
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HASHIMOTO Osamu
Aoyama Gakuin University
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Kurita Daisuke
National Institute of Information and Communications Technology
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Kurita Daisuke
National Institute Of Information And Communications Technology (nict)
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Hashimoto Osamu
Aoyama Gakuin Univ. Sagamihara‐shi Jpn
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YAMAMOTO Yasuhisa
Aoyama Gakuin University
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Hashimoto Osamu
College Of Science And Engineering Aoyama Gakuin University
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