Antennas and Electric Field Sensors for Ultra-Wideband Transient Time-Domain Measurements: Applications and Methods
Many time-domain electromagnetic measurements require sensors that generate accurate signals proportional to the incident electric field for some finite clear time, after which the response may be of little interest, except for a possible frequency-domain requirement on the damping of resonances. In a review of earlier work,1 examples of such devices are given that combine more conventional antennas with open transmission lines. In designs that can have highly directional properties, antenna effective height h eff, risetime t r , and clear time t c may be chosen independently. Current work focuses on extending the parameter range of these sensors to greater sensitivity and shorter risetimes, where sensor performance becomes limited by the effects of skin and dielectric loss and dispersion. These limitations are largely overcome through the use of guided-wave optics in sensor designs.
KeywordsDielectric Loss Transmission Line Ground Plane Cable Length Clear Time
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- 1.C. J. Buchenauer and J. R. Marek, “Antennas and Electric Field Sensors for Time-Domain Measurements: An Experimental Investigation,” in: Ultra-Wideband Short-Pulse Electrornagnetics 2, Plenum Press, New York, 1995.Google Scholar
- 2.E. G. Farr and C. J. Buchenauer, “Experimental Validation of IRA Models,” Sensor and Simulation Note 364, Jan. 1994.Google Scholar
- 5.D. V. Giri and C. E. Baum, “Equivalent Displacement for a High-Voltage Rollup on the Edge of a Conduction Sheet,” Sensor and Simulation Note 294, Oct. 1986.Google Scholar
- 6.C. E. Baum and J. S. Tyo, “Transient Skin Effects in Cables,” Measurement Notes # 47, Aug. 1996.Google Scholar
- 7.T. L. Brown and K. D. Granzow, “A Parameter Study of Two-Parallel-Plate Transmission-Line Simulators of EMP Sensor and Simulation Note XXI,” Sensor and Simulation Note LII, Apr. 1968.Google Scholar
- 8.N. S. Nahman, “A Discussion on the Transient Analysis of Coaxial Cables Considering High-Frequency Losses,” IRE Trans. Circuit Theory, pp. 144–152, Jun. 1962.Google Scholar
- 10.H. Curtins and A. V. Shah, “Pulse Behavior of Transmission Lines with Dielectric Losses,” IEEE Trans. Circuits and Systems, vol. 8, Aug. 1985.Google Scholar
- 14.A. von Hippel and W. B. Westphal, “Tables of Dielectric Materials,” MIT Cambridge Laboratory for Insulation Research, Apr. 1957.Google Scholar
- 15.A. von Hippel, Dielectric Materials and Applications, Artech House, Boston, 1994.Google Scholar
- 16.C. E. Baum, “Aperture Efficiencies for IRA’s,” Sensor and Simulation Note 328, Jun. 1991.Google Scholar
- 17.E. G. Farr, and C. E. Baum, “Radiation from Self-Reciprocal Apertures,” in: Electromagnetic Symmetry, C. E. Baum and H. N. Kritikos, Editors, Taylor and Francis. Washington, D.C., 1995.Google Scholar
- 18.E. G. Farr, “Optimization of the Feed Impedance of Impulse Radiating Antennas Part IT: TEM Horn and Lens IRA’s,” Sensor and Simulation Note 384, Nov. 1995.Google Scholar