Comparative analysis of the electrical properties of a low noise oscillator embedded in a symmetrical square open-loop with loaded stub resonator

Cho, S.-J. and Kim, N.-Y. (2014) Comparative analysis of the electrical properties of a low noise oscillator embedded in a symmetrical square open-loop with loaded stub resonator. Microwave and Optical Technology Letters, 56(9), pp. 2132-2136. (doi: 10.1002/mop.28506)

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Abstract

The design of two types of miniaturized microstrip stub-loaded square open-loop resonators with asymmetrical feeder lines and their implementation into a microwave oscillator are presented in this article. The adopted resonator is based on a combination of electric and magnetic couplings in the central open gaps of the square loop resonators. The combined couplings generate an electromagnetic (EM) flux between the two square open-loop resonators. The maximum coupling can be obtained by adjusting the open-loop gap (the spacing between the two open-loop resonators) and the orientation of the loaded-stubs or T-stubs inside the loop resonators. The asymmetrical port terminals also help couple EM energy by maintaining 50-Ω impedance matching with the input/output devices. The improved high Q-factor characteristics and the higher transmission zero result in high oscillator power and low phase noise characteristics. The square open-loop with a loaded T-stub resonator performance results are shown in a return loss of −24.8 dB, an insertion loss of −1.6 dB and a quality factor of 163 at 5.9 GHz C-band application. In addition, careful design of the resonator resulted in an optimized oscillator. An oscillator with the proposed resonator shows good phase noise performance of −104.62 dBc/Hz at a 100 kHz offset from the carrier frequency of 6.2 GHz with an output power of 14.68 dBm.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cho, Dr Sung-Jin
Authors: Cho, S.-J., and Kim, N.-Y.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Microwave and Optical Technology Letters
Publisher:Wiley Periodicals, Inc.
ISSN:0895-2477
ISSN (Online):1098-2760

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