Sat, 05 Jul 2008 06:04:27 BST CiteULike: dcastro's library [1879 articles] http://www.citeulike.org/user/dcastro/article/2774502 CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2774502 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 50, No. 1. (2002), pp. 201-206.</i><br /><br />Active patch antennas are simple to fabricate, compact, and low cost, but have inherently poor phase noise and stability. In this paper, a phase-locked loop (PLL) integrated with a 4-GHz active patch antenna was investigated in order to reduce the phase noise and stabilize the frequency of the oscillator. Both these aims were realized by careful integration and optimization of the PLL parameters. Experimental results showed that a phase noise reduction in excess of 55 dB was achieved using this technique. A standalone voltage-controlled oscillator and passive patch technique can provide lower phase noise, but the active patch lends itself to effective integration. Measurement techniques were demonstrated to measure the phase noise and stability of the patch oscillator Phase-locked-loop control of active microstrip patch antennas JW Andrews PS Hall doi:10.1109/22.981266 Microwave Theory and Techniques, IEEE Transactions on, Vol. 50, No. 1. (2002), pp. 201-206. 2008-05-09T06:40:39-00:00 2002 Microwave Theory and Techniques, IEEE Transactions on 50 1 201 206 active antenna microstrip patch pll