Sun, 06 Jul 2008 11:08:45 BST CiteULike: dcastros transmiter http://www.citeulike.org/user/dcastro/tag/transmiter CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2774523 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 12. (2000), pp. 2686-2691.</i><br /><br />This paper presents an optically switched X-band active antenna element for half-duplex transmit/receive (T/R) applications. The antenna element is designed to be a unit cell of a quasioptical array with fast switching between T and R and with built-in phase-shifterless beamforming. The measured performance of the active element is 14 dB gain contributed by the power amplifier (PA) in transmission and 16 dB gain contributed by the low-noise amplifier in reception, with 30 dB isolation between T and R. The switching is accomplished with only 1 μW of optical power for 1.7 μs switching time (1.7 pJ of optical energy) and a rise time of 2 ns at 10 GHz with 7 mW of optical power (14 pJ of optical energy). The design, implementation, and measured performance of the optically controlled transmit/receive circuit are presented A transmit/receive active antenna with fast low-power optical switching J Vian Z Popovic doi:10.1109/22.899031 Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 12. (2000), pp. 2686-2691. 2008-05-09T06:44:38-00:00 2000 Microwave Theory and Techniques, IEEE Transactions on 48 12 2686 2691 active antenna fast low power receiver transceiver transmiter http://www.citeulike.org/user/dcastro/article/2755634 <i>Telecommunications in Modern Satellite, Cable and Broadcasting Service, 2003. TELSIKS 2003. 6th International Conference on, Vol. 1 (2003), pp. 49-52 vol.1.</i><br /><br />In this paper is described one method for variation of impedance of patch antennas. With this method both phase and magnitude of impedance can be varied in wide range of different values. This gives us possibility of integration of antenna with variety of different active microwave semiconductors. First of all we described method and its characteristics such as values of patch impedance, which can be attained, and later we demonstrated application of method in case of patch antenna integrated with low noise amplifier (LNA) in receiver. Active patch antennas integrated with Rx/Tx front end D Radulovic A Nesic I Radnovic doi:10.1109/TELSKS.2003.1246182 Telecommunications in Modern Satellite, Cable and Broadcasting Service, 2003. TELSIKS 2003. 6th International Conference on, Vol. 1 (2003), pp. 49-52 vol.1. 2008-05-05T08:05:26-00:00 2003 Telecommunications in Modern Satellite, Cable and Broadcasting Service, 2003. TELSIKS 2003. 6th International Conference on 1 49 52 vol.1 active antenna integrated patch receiver transmiter http://www.citeulike.org/user/dcastro/article/2648090 <i>Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on (2007), pp. 1-4.</i><br /><br />This paper discusses the design and implementation of an active transmit-receive antenna, integrating an active devices onto a printed antenna to improve its performance and combine functions within the antenna itself. It includes a circular polarized microstrip patch antenna, two amplifiers, a power divider and a rat race coupler to isolate transmit and receive paths. The beamwidth of the antenna is in the range of 60° to 70° for H plane. The radiation pattern for E plane is smaller compared to the H plane. The comparison between the passive and the active integrated antenna shows that the active integrated antenna has 3 dB extra gain compared to the passive antenna, for both transmit and receive. The isolation between transmit and receive is between 20 to 25 dB. This active antenna has potential uses in WLAN communication applications. Simultenous Transmit and Receive Circular Polarized Active Integrated Antenna MKA Rahim QX Feng T Masri Karim Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on (2007), pp. 1-4. 2008-04-10T06:19:01-00:00 2007 Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on 1 4 active antenna circular diplexed integrated polarisation receiving transmiter