Title :
A Novel Ultra-Wideband Differential Filter Based on Microstrip Line Structures
Author :
Xiao-Hua Wang ; Hualiang Zhang ; Bing-Zhong Wang
Author_Institution :
Sch. of Phys. Electron., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
A novel differential filter with ultra-wideband (UWB) response is proposed in this letter based on microstrip line structures. 180° UWB phase shifters and 360° transmission lines are employed in the design to get the 180° phase shift over broad bandwidth. In this way, the broadband conversion between in- and out-of-phase signals can be realized. Utilizing this characteristic, the undesired common-mode noises will be cancelled out at the center of the filter, while the input differential-mode signals can still propagate well. The proposed new differential filter was calculated by transmission line model, simulated by full-wave electromagnetic simulator, and validated by the measurement. The simulation and measurement results verify its good performance. It is validated that, in the proposed filter, the differential-mode signals can propagate well with UWB frequency response, while the common-mode noises are well suppressed with more than 10 dB suppression in the concerned frequency band.
Keywords :
frequency response; microstrip filters; microstrip lines; phase shifters; ultra wideband technology; UWB frequency response; UWB phase shifter; broadband conversion; common-mode noise; full-wave electromagnetic simulator; in-of-phase signal; input differential-mode signal; microstrip line structure; out-of-phase signal; transmission line model; ultrawideband differential filter; Noise; Phase shifters; Power transmission lines; Transmission line measurements; Ultra wideband technology; Wideband; Wireless communication; Differential filter; differential-/common-mode; microstrip line; noise suppression; ultra-wideband (UWB);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2013.2243719