Design of a New Tri-Band Microstrip BPF Using Combined Quarter-Wavelength SIRs
作者： C.-H. Lee , C.-I.G. Hsu , H.-K. Jhuang
关键词: Acoustics 、 Electronic filter 、 Band-pass filter 、 Transmission line 、 Electronic engineering 、 Microstrip 、 Filter (video) 、 Passband 、 Q factor 、 Resonator 、 Engineering
摘要: A new tri-band microstrip bandpass filter (BPF) is designed to produce three passbands at the commercially practical frequencies through a single piece of circuitry. The basic component used build proposed consists two quarter-wavelength (lambda/4) stepped-impedance resonators (SIRs). One lambda/4 SIRs operate 1.57 GHz and 5.25 GHz, other 2.45 GHz. feed positions for are carefully located have same distance from via-hole ground meanwhile give required external quality factors (Qe's). In such way, microstripline sections between each can be combined into one simplify structure, reduce BPF circuit size. Performance newly verified by measured results
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