Strip-line StF4 antenna excited by step-like pulsed voltage as radiator of calibrated UWB electromagnetic delta-like impulses

Well-known reciprocity theorem predicts identical the received pulse signals when we permute the places for electrically linear the receiving and radiating antennas. It is realizing if the Aeff-effective aperture of antennas is equal in the receiver and transmitter modes. Our test results confirm this theorem Our sensor antenna StF4 is the wave directional coupler of TEM strip-line type. This strip-line contains the rod with high dielectric permittivity equal 16, small cross-section 1.5 × 1.5mm² (geometric face aperture), length 40cm. The StF4 impulse data were measured in the traveling electromagnetic (EM) waves inside the gauge TEM-line-cell with sizes: 2 cm gap, 8.3 cm width of signal foil, 70 cm length. This line-cell was tested by reflect-meter with rise-time 15 ps, the rise-time of line-cell input was 0.03 ns. The measured parameters of StF4: sensitivity K = 0.32V/(kV/m) and effective aperture Aeff-= K·K·Z/Zs = 0.77mm² (Z = 377 Ohm, Zs = 50 Ohm), 0.03 ns-rise-time and time interval up to 7ns in receiver and transmitter modes. Experimental results were in good accordance with simulations by the electromagnetic 3-D code “KARAT”. Transmitter with the StF4 - as radiating antenna with excitation step-generator will radiate the ultra short EM waves with delta-like shape and with uniform ultrawideband frequency spectrum. Any antenna is received such wave impulse, then will produce in her feeder the voltage impulse response which will display her impulse characteristic with time resolution up to 30 ps and duration up to 7 ns.