Direct Antenna Modulation (DAM) with Switched Patch Antenna Performance Analysis
关键词:
Direct antenna modulation, impulse radio, switched resonator, time-varying systems and ultra-wideband antennas摘要
Resonant antennas, such as patch antennas, can be directly modulated with high speed switch devices that were integrated onto the radiation aperture, as the radiation can be turned on or shut off in real-time. Such an antenna is found to be able to radiate pulses with rich spectrum components far beyond the antenna's originally defined bandwidth. In this paper, the efficiency bandwidth product of such an antenna is examined to determine whether it can potentially surpass the usual limit defined by the antenna quality factor. For this purpose, a thorough study on the time-varying behavior of a directly modulated microstrip patch antenna is carried out. The theoretical performance of such an antenna in its radiation power and efficiency is discussed. The time-domain analysis starts with the transmission line model of the patch antenna and the equivalent circuit models. A full-wave Finite Difference Time Domain (FDTD) code that incorparates time-varying switching devices in its mesh is then used to simulate the dynamics of the antenna. The study has demonstrated the capability of improving the radiation efficiency and bandwidth performance over the convential 1/Q limit, with the so-called Direct Antenna Modulation (DAM) technique.
##plugins.generic.usageStats.downloads##
参考
H. G. Schantz, “Introduction to ultra-wideband antenna,” IEEE UWBST 2003 Conference Proceedings, pp. 1-9, November 2003.
H. G. Schantz, “A brief history of ultra-wideband antennas,” IEEE UWBST 2003 Conference Proceedings, pp. 209-213, November 2003.
K. Y. Yazdandoost and R. Kohno, “Ultra- wideband antenna,” IEEE Communications Magazine, vol. 42, pp. 29-32, June 2004.
J. T. Merenda, “Synthesizer radiating systems and methods,” U.S. Patent No. 5,402,133, March 28, 1995.
V. F. Fusco and Q. Chen, “Direct-signal modulation using a silicon microstrip patch antenna,” IEEE Trans. on Antenna and Propagation, vol. 47, pp. 1025-1028, June 1999.
W. Yao and Y. Wang, “Radiating beyond the bandwidth using direct antenna modulation,” Antennas and Propagation Society International Symposium, IEEE, vol. 1, pp. 20-25, June 2004.
W. Yao and Y. Wang, “Direct antenna modulation- a promise for ultra-wideband (UWB) transmitting,” Microwave Symposium Digest, IEEE MTT-S International, vol. 2, pp. 1273-1276, June 2004.
S. D. Keller, W. D. Palmer, and W. T. Joines, “Direct antenna modulation: analysis, design, and experiment,” IEEE Antennas and Propagation reconfigurable antennas-concepts, analysis, implementation, and feasibility,” IEEE Trans. Microwave Theory and Techniques, vol. 51, pp. 1650-1661, June 2003.
J. T. Aberle, S. H. Oh, D. T. Auckland, and S. D. Rogers, “Reconfigurable antennas for wireless devices,” IEEE Trans. Antennas and Propagation Magazine, vol. 45, pp. 148-154, December 2003.
V. P. Prokhorenko, V. E. Ivashchuk, and S. V. Korsun, “Electromagnetic impulse radiator,” Ultrawideband and Ultrashort Impulse Signals, Sevastopol, Ukraine, pp. 243-245, September 19- 22, 2004.
V. P. Prokhorenko, V. E. Ivashchuk, and S. V. Korsun, “On radiation efficiency and radiating capability of impulse antennas,” Ultrawideband and Ultrashort Impulse Signals, Sevastopol, Ukraine, pp. 251-253, September 19-22, 2004.
V. P. Prokhorenko, V. E. Ivashchuk, and S. V. Korsun, “Improvement of electromagnetic pulse radiation efficiency,” Subsurface Sensing Technologies and Applications, vol. 6, pp. 107- 123, April 2005.
X. Xu, H. C. Jing, and Y. E. Wang, “High speed pulse radiation from switched electrically small antenna,” 2006 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting, Albuquerque, New Mexico, July 2006.
R. Harrington, “Effects of antenna size on gain, bandwidth, and efficiency,” Journal of Research of National Bureau of Standards, v 64-D, pp. 1-12, 1960.
S. Kim and Y. E. Wang, “Theory of switched RF resonators,” IEEE Trans. Circuits and Systems, vol. 53, pp. 2521-2527, December 2006.
H. Liu, “Error performance of a pulse amplitude and position modulated ultra-wideband system over lognormal fading channels,” IEEE Comm. Letters, vol. 7, no. 11, pp. 531-533, November 2003.
C. A. Balanis, “Antenna theory: analysis and design,” Third Edition, John Wiley & Sons, Inc, 2005.
F. Raab, “Idealized operation of the class e tuned power amplifier,” Circuits and Systems, IEEE Trans. Circuits and Systems, vol. 24, no. 12, pp. 725-735, December 1977.
A. Taflove and S. C. Hagness, “Computational electrodynamics: the finite-difference time-domain method,” Second Edition, Artech House, 2000.
C. E. Baum, “Radiation of impulse-like transient fields,” Sensor and Simulation Notes 321 USAF Phillips Lab, Albuquerque, NM, November 1989.
