Comparison of the Effective Potentials of Ultrawideband Combined and Helical Antennas

Comparative experimental investigations of combined and helical ultra-wideband antennas are performed. The antennas are optimized to be excited by the 1 ns bipolar voltage pulses. The antenna matching with the feeder is studied in the frequency domain. The antenna patterns by the peak value of the radiated field are studied in the time domain for E- and H-planes. The effective potential values in the boresight radiation direction are studied as well with the same exciting voltage pulse at the antenna inputs. A probability is found for the effective potential of the helical antenna to be larger than that of the combined antenna in the case of an arbitrary orientation of the receiving linearly-polarized antenna. The effective potential of both antennas was registered in the pattern maxima at the same distances. This probability is equal to 0.6.