https://scholars.lib.ntu.edu.tw/handle/123456789/342544
Title: | A beam-steering antenna array using injection locked coupled oscillators with self-tuning of oscillator free-running frequencies | Authors: | S. H. Yan TAH HSIUNG CHU |
Keywords: | Coupled oscillators; Injection locked oscillators; Phase locked loops; Stability | Issue Date: | Sep-2008 | Journal Volume: | 56 | Journal Issue: | 9 | Start page/Pages: | 2920-2928 | Source: | IEEE Transactions on Antennas and Propagation | Abstract: | The analysis and experimental results of an antenna array using injection locked coupled oscillators with self-tuning of oscillator free-running frequencies are presented. With the use of coupled type-II phase locked loops for tuning oscillator free-running frequencies and an external injection signal for stabilizing the array operating frequency, this antenna array can steer its beam through a single control voltage and hold its output frequency at the injection signal frequency in operation. In addition, its beam-pointing error arising from phase errors in coupled oscillators can be reduced and the array works well over a certain frequency band. Phase dynamics and stability are studied and experimentally verified. Experimental results of a three-element injection locked coupled oscillator array show that its uniform phase progression ranges between -16° and 52°, and the phase errors are less than 5° at 2.7 GHz. The operation bandwidth is shown from 2.68-2.72 GHz. By loading the injection locked coupled oscillator array with rectangular patch antennas, the beam-steering radiation characteristics are measured at various control voltages. © 2008 IEEE. |
URI: | http://scholars.lib.ntu.edu.tw/handle/123456789/342544 | DOI: | 10.1109/TAP.2008.928770 | SDG/Keyword: | Antenna arrays; Antenna phased arrays; Errors; Frequency bands; Injection (oil wells); Oscillators (mechanical); Phase stability; Tuning; Coupled oscillators; Injection locked oscillators; Injection locking; Phase locked loops; Stability; Oscillators (electronic) |
Appears in Collections: | 電機工程學系 |
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