A new approach to the push–push oscillator based on a differential SIW bandpass filter

ABSTRACT

A novel push–push oscillator based on a differential bandpass filter (BPF) using substrate integrated waveguide (SIW) technique is presented in this paper. For the first time, the differential SIW BPF is utilized as a frequency stabilization element to provide differential outputs in designing the push–push oscillator. The complex quality factor (Q_sc)-peak frequency of the BPF is chosen for the design at approximately half the final output frequency to achieve low phase noise performance. Moreover, two transmission zeros (TZs) below the passband and two TZs above the passband which highly improve the out-of-band rejection are obtained by using both electromagnetic coupling and cross coupling. An SIW power combiner is also designed to obtain the desired signal. A push–push oscillator has been proposed and experimentally demonstrated at 27.8 GHz to verify the above design concept. The measured results show that the output power is −17.3 dBm with a phase noise of 128.6 dBc/Hz at 1-MHz offset.

KEYWORDS:

• Push–push oscillator
• differential bandpass filter
• substrate integrated waveguide

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Hao Zhang

Hao Zhang was born in Nanjing, China, in 1989. He received the B.Eng. degree in electronic engineering from Nanjing University of Science and Technology, Nanjing, China, in 2012, where he is currently pursuing the Ph.D. degree in information and communication engineering. His current research interests include substrate integrated waveguide components and systems, microwave wave circuits and differential networks. Dr Zhang has been a Reviewer of the IEEE Microwave and Wireless Components Letters, Journal of Electromagnetic Waves and Applications, and International Journal of Electronics and Communications.

Wei Kang

Wei Kang (S'05–M'08) was born in He'nan, China, in 1979. He received the B.S. degree in electronic engineering from the Nanjing University of Science and Technology (NUST), Nanjing, China, and the M.S. and Ph.D. degrees in microwave engineering from Southeast University, Nanjing. He is currently an Associate professor with the School of Electronic Engineering and Optoelectronic Technology, NUST. He has authored or coauthored several international journal and conference papers. His current research interests include RF circuits and microwave and millimeter-wave circuits and detection technology.

Wen Wu

Wen Wu (SM'10) received the Ph.D. degree in electromagnetic field and microwave technology from Southeast University, Nanjing, China, in 1997. He is currently a Professor with the School of Electronic Engineering and Optoelectronic Technology, and an Associate Director of the Ministerial Key Laboratory, JGMT, Nanjing University of Science and Technology, Nanjing. He has authored or coauthored over 120 journal and conference papers. He has submitted five patent applications. His current research interests include microwave and millimeter-wave theories and technologies, microwave and millimeter-wave detection, and multimode compound detection. Dr Wu was a six-time recipient of ministerial and provincial-level science and technology awards.