Design of Non-Uniformly Spaced Circular Arrays of Parasitic Dipoles for Lower Side Lobe Level with Maximum Directivity

This paper presents a new approach for circular array of parasitic dipoles composed by one active dipole for reduction of side lobe level with maximum directivity including mutual coupling. The desired goal is obtained by changing the spacing between the parasitic elements and length of the parasitic elements while the position and length of driven element is fixed. In addition to it, reflection coefficient (RC) of the driven element is kept closer to the specified value. Matlab based method of moment code is used to evaluate the performance of circular antenna designs generated by QPSO algorithm. Two examples are presented to show the effectiveness of this proposed approach.

Dual-Polarized Antenna Sub-Array of 2×2 Elements for Measurements of Short Electromagnetic Pulses

Results of the investigations of a dual-polarized antenna module of a 2×2 receiving antenna array designed for recording the waveform of short electromagnetic pulses are presented. Each element of the antenna array is an active dipole that is loaded on the single-stage FETbased amplifier. Results of the measurements of the patterns, effective length, and waveforms of the recorded pulses are presented.