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[IEEE 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Design of Ultra-Wideband Bandpass (UWB) Filter with Enhanced Couplings by Using Lumped Capacitors
摘要： This paper presents a novel ultra-wideband bandpass (UWB) filter with enhanced input/output couplings by high quality lumped capacitors in place of traditional coupling methods. The filter consists of traditional stub-loaded dual-mode resonator and a pair of lumped capacitors, which symmetrically located at the input/output ports. Different from the technology of parallel-coupled microstrip lines in enhancing the capacitive couplings, this paper uses high quality ceramics trimmer capacitors to realize strong capacitive couplings at the input/output ports. A compact microstrip UWB filter designed by this method is simulated, fabricated and measured. The simulated and measured results are in good agreements, showing validity of the proposed method.
关键词： dual-mode resonator,capacitive couplings,lumped capacitors,Ultra-wideband (UWB) filter
更新于2025-09-04 15:30:14
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TWO-WAY MODIFIED WILKINSON POWER DIVIDER FOR UWB APPLICATIONS USING TWO SECTIONS OF UNEQUAL ELECTRICAL LENGTHS
摘要： This paper presents 2-way Power Divider (PD) for Ultra-Wideband (UWB) applications. The proposed power divider is realized using two cascaded sections of Wilkinson Power Divider (WPD) of equal characteristic impedances and unequal electrical lengths with inserted open stub to improve matching, isolation and to broaden the bandwidth. It is proved analytically using the “Even Odd Mode” analysis method and the ABCD matrix to obtain exact closed-form design equations. A detailed design methodology is introduced to facilitate the implementation without needing CAD optimization. To verify the proposed design methodology, a 2-way power divider is designed, fabricated on a Rogers RT/Duroid 5880 substrate and compared to other published 2-way microstrip power dividers. Measured data show good agreement with Electromagnetic (EM)-Circuit Co-Simulation, which proves the design equations and methodology. The proposed planar 2-way PD achieves an isolation ≥ 13.5 dB, input return loss ≥ 10 dB, output return loss ≥ 14.5 dB and exceeded insertion loss ≤ 0.9 dB (over the ?3 dB splitting ratio) through the whole UWB range from 3.1 GHz to 10.6 GHz. Furthermore, it has a compact area of 22 mm × 15 mm, which provides 50% enhancement over similar microstrip PD circuits while achieving better isolation and matching.
关键词： Power Divider (PD),Ultra-Wideband (UWB),ABCD Matrix,Wilkinson Power Divider (WPD),Even-Odd Mode Analysis
更新于2025-09-04 15:30:14