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作者机构:Univ Birmingham Sch Elect & Elect Engn Commun Engn Grp Birmingham B15 2TT W Midlands England Queens Univ Belfast Dept Elect & Elect Engn High Frequency Elect Lab Belfast BT9 5AH Antrim North Ireland
出 版 物:《IEE PROCEEDINGS-MICROWAVES ANTENNAS AND PROPAGATION》 (IEE Proc Microwaves Antennas Propag)
年 卷 期:2001年第148卷第1期
页 面:15-20页
核心收录:
学科分类:0810[工学-信息与通信工程] 080904[工学-电磁场与微波技术] 0808[工学-电气工程] 0809[工学-电子科学与技术(可授工学、理学学位)] 08[工学] 080402[工学-测试计量技术及仪器] 0804[工学-仪器科学与技术] 081001[工学-通信与信息系统]
主 题:FREQUENCY SHIFT cavity Quality factor Array Element Phase noise Oscillators Active integrated antenna
摘 要:The use of a cavity coupled to an active integrated antenna oscillator is described. The cavity increases the loaded Q factor of the oscillator, thus improving stability and reducing the phase noise. Cavity stabilisation of a microstrip patch and slot ring oscillators is described, In both cases, phase noise at a frequency offset of 10kHz is reduced by the order of 20dB. A first-order analysis based on measured and simulated cavity Q factors is shown to give similar results. A Van der Pol analysis of a two-element array of patch oscillators, with a single extended coupled cavity, indicates that the likelihood of mutual locking in an array which has oscillators with slightly different free running frequencies is enhanced albeit at the expense of increased start-up time.