DocumentCode :
854063
Title :
A Beam-Steering Antenna Array Using Injection Locked Coupled Oscillators With Self-Tuning of Oscillator Free-Running Frequencies
Author :
Yan, Sheng-Hong ; Chu, Tah-Hsiung
Author_Institution :
Grad. Inst. of Commun. Eng., Nat. Taiwan Univ., Taipei
Volume :
56
Issue :
9
fYear :
2008
Firstpage :
2920
Lastpage :
2928
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 -16deg and 52deg , and the phase errors are less than 5deg 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.
Keywords :
antenna arrays; beam steering; injection locked oscillators; microstrip antennas; phase locked loops; stability; array operating frequency stabilization; beam-pointing error; beam-steering antenna array; coupled type-II phase locked loop; external injection signal; frequency 2.68 GHz to 2.72 GHz; injection locked coupled oscillator; oscillator free-running frequency self-tuning; phase error; rectangular patch antenna; Antenna arrays; Frequency; Injection-locked oscillators; Optical coupling; Phase locked loops; Phased arrays; Stability; Tuning; Voltage control; Voltage-controlled oscillators; Coupled oscillators; injection locked oscillators; phase locked loops; stability;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.2008.928770
Filename :
4618721
Link To Document :
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