Radiation of ultrawideband pulses with elliptical polarization by a four-element cylidrical helical antenna array
The paper presents the results of the experimental investigations of a square 2´2 four-element helical antenna array. A cylindrical equidistant helical antenna with the number of turns N = 4.5 was chosen as an element of the antenna array. The array was excited by a bipolar voltage pulse with pulse duration of 1 ns and amplitude of 27 V. Experimental investigations of the antenna array were perfomed in the frequency and time domain. The energy efficiency kw of the array is 0.77 at the value of the efficiency by the peak field strength kE = 2.