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 k<sub>w</sub> of the array is 0.77 at the value of the efficiency by the peak field strength k<sub>E</sub> = 2.