A Compact Balanced-to-Balanced Filtering Gysel Power Divider Using \lambda /2 Resonators and Short-Stub-Loaded Resonator

• Published in: IEEE microwave and wireless components letters 2017-07, Vol.27 (7), p.645-647
• Main Authors: Luo, Ming, Xu, Xin, Tang, Xiao-Hong, Zhang, Yong-Hong
• Format: Article
• Language: English
• Subjects: Balanced-to-balanced (BTB) circuit; Bandpass; bandpass filter; common mode (CM); Couplings; Design factors; Design methodology; differential mode (DM); Equivalent circuits; Filtration; Gysel power divider; Power dividers; Q factors; Resonant frequency; Resonators; Wireless communication
• ISSN: 1531-1309; 2771-957X; 1558-1764; 2771-9588
• DOI: 10.1109/LMWC.2017.2711926

In this letter, a compact balanced-to-balanced filtering power divider (FPD) is presented. It is composed of three half-wavelength resonators and a short-stub-loaded resonator (SSLR). Due to the intrinsic resonance characteristic of the half-wavelength resonator, the bandpass response and power dividing function for differential-mode signal are realized and the suppression for common-mode signal is also achieved. The SSLR is utilized as an extra isolation resonator to achieve high isolation between two output ports. A resister is also needed to load on the SSLR for adjusting its loaded quality factor (Q e ). For the demonstration of the design method, an FPD operating at 2.405 GHz has been fabricated and measured. The measured results validate the design method.