Compact ultra-wideband filter using coupled-line and short-ended stub

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Compact ultra-wideband filter using coupled-line and short-ended stub

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© The Institution of Engineering and Technology
Published

A compact ultra-wideband filter is presented. The filter consists of a section of coupled microstrip-line and a short-ended stub. It has a simple structure and small size (4.7×6.2 mm2), but exhibits good performance. The filter has been investigated numerically using the simulator IE3D, and samples were fabricated and measured. Measured results show that the filter has a fractional bandwidth of 103.2% (from 3.05 to 9.55 GHz) and minimal insertion loss of −0.4 dB. The measured in-band return loss is better than −15.0 dB.

Inspec keywords: microstrip lines; microstrip filters; ultra wideband technology

Other keywords: coupled microstrip-line; short-ended stub; compact ultra-wideband filter

Subjects: Waveguides and microwave transmission lines; Filters and other networks

References

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      • Federal Communications Commission: ‘Revision of part 15 of the Commission's rules regarding ultra-wideband transmission systems’, Tech. Rep., ET-Docket 98-153, FCC02-48, April 2002.
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      • L. Han , K. Wu , X.P. Zhang . Development of packaged ultra-wideband bandpass filters. IEEE Trans. Microw. Theory Tech. , 1 , 220 - 228
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      • M.H. Ren , D. Chen , C.H. Cheng . A novel wideband bandpass filter using a cross-shaped multiple-mode resonator. IEEE Microw. Wirel. Compon. Lett. , 1 , 13 - 15
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