A modified Jerusalem microstrip filter and its complementary for low phase noise X-band oscillator

• Published in: International journal of microwave and wireless technologies Vol. 15; no. 10; pp. 1707 - 1716
• Main Authors: Nimehvari Varcheh, Hamed, Rezaei, Pejman, Kiani, Sina
• Format: Journal Article
• Language: English
• Published: Cambridge, UK Cambridge University Press 01.12.2023
• Subjects: Design; Electronic filters; Filters; Fractals; Frequency stabilization; Integrated circuits; Microstrip devices; Microwave oscillators; Narrowband; Oscillators; Phase noise; Radio frequency; Simulation; Superhigh frequencies; Jerusalem Israel; Israel; Jerusalem filter; low phase noise; microstrip oscillator; complementary filter
• ISSN: 1759-0787; 1759-0795
• DOI: 10.1017/S1759078723000703

This article shows the design of two different low phase noise (LPN) planar X-band frequency oscillators using two various microstrip filters (MFs). These two MFs act as a frequency stabilization part in the loop of the microwave oscillator. The first one, the modified Jerusalem MF (MJ-MF), is based on the Jerusalem scheme. The second one, the complementary modified Jerusalem MF (CMJ-MF), is complementary of the MJ-MF. Finally, by employing the branchline coupler, the LPN MF oscillator is achieved. The MJ-MF (narrowband filter) LPN X-band oscillator operates at 8.17 GHz and denotes a phase noise (PN) of −161 dBc/Hz at 1-MHz frequency offset. The CMJ-MF (wideband filter) LPN X-band oscillator operates at 8.14 GHz and mentions a PN of −157 dBc/Hz at 1-MHz frequency offset.