Compact and independently-design tri-band bandpass filter with bandwidth and return loss control

作者：Lu, Di^*; Barker, Nicolas Scott; Tang, Xiao H.

来源：Electronics Letters, 2016, 52(24): 1992-1993.

DOI：10.1049/el.2016.3247

• PASSBAND

A compact tri-band bandpass filter with high controllability is proposed using two multipath lambda/4 resonator-loaded resonators (MRLRs). Separated electric and magnetic coupling (SEMC) is applied into the filter, which introduces multiple transmission zeros (TZs) and enables each bandwidth to be separately controllable. In addition, both the return loss control and centre frequency (CF) control are implemented by changing the physical dimension of MRLRs. Owing to the usage of SEMC, three TZs can be, respectively, allocated either below or above the associated passbands. Moreover, the third passband can be far away from the first passband, e.g. 1.57/5.8 GHz (f(1)/3.7f(1)), when each passband is independently designed. A filter example operating at 1.57/3.5/5.8 GHz (GPS/WiMAX/WLAN) with a size of 0.08 lambda(g) x 0.14 lambda(g) is designed and fabricated. Good agreement between simulation and measurement is achieved to validate its performance.

• 出版日期2016-11-24
• 单位电子科技大学