Coupling behaviors of quarter-wavelength impedance transformers for wideband CPW bandpass filters

被引：20
|
作者：
Zhu, L [1 ]
Shi, HM
Menzel, W
机构：
[1] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
[2] Univ Ulm, Dept Microwave Tech, D-89069 Ulm, Germany
来源：
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS | 2005年 / 15卷 / 01期
关键词：
coplanar waveguide (CPW) coupling structures; harmonic suppression; lambda/4 CPW bandpass filter; lambda/4 impedance transformer; wide passband;
D O I：
10.1109/LMWC.2004.840956
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Quarter-wavelength coplanar waveguide (lambda/4-CPW) impedance transformers with low and high characteristic impedance are characterized via fullwave method of moments short-open calibration (MoM-SOC) approach and further utilized as alternative K- and J-inverter networks with enhanced coupling. Network parameters are obtained and compared with those of two traditional lumped-CPW elements, demonstrating tightened coupling behaviors. The two improved lambda/4 CPW bandpass filters are then constructed and their performances are optimized via cascaded topology. Predicted results show us a few attractive features, i.e., wide passband and first-order harmonic suppression as confirmed by experiment.
引用
收藏
页码：13 / 15
页数：3
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