Low phase-noise oscillator based on SIW bandpass filter implementing at the Q_sc-peak frequency

ABSTRACT

In this paper, a novel low phase-noise oscillator employing an substrate integrated waveguide (SIW) bandpass filter (BPF) embedded with a complementary spiral resonator (CSR) is proposed. The Q_sc-peak frequency is chosen for the design of the oscillator to achieve optimal phase noise performance. The CSR exited by TM₀₁ mode has been etched on the top metal of the circular cavity. Three transmission poles and three transmission zeros can be obtained by the proposed SIW BPF which is regarded as the frequency stabilization element. Meanwhile, a short summary about how to obtain a high Q_sc-factor to achieve low phase noise performance has been illustrated. A C-band oscillator using a field effect transistor has been designed and experimentally demonstrated at 5.71 GHz with a 147.6 dBc/Hz phase noise at 1 MHz offset frequency. Moreover, the output power is −1.49 dBm with a figure of merit of −209.2 dBc/Hz and less than −32.8 dBm spurious harmonics is obtained.

KEYWORDS:

• Complementary spiral resonators
• substrate integrated waveguide
• complex quality factor (Q_sc)
• oscillator

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 BEng degree in electronic engineering from Nanjing University of Science and Technology, Nanjing, China, in 2012, where he is currently pursuing the PhD 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 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 BS degree in electronic engineering from the Nanjing University of Science and Technology (NUST), Nanjing, China, and the MS and PhD 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 PhD 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.