EFFECTIVE AREA AND DIRECTIONAL PATTERNS OF ANTENNA ARRAY OPERATING IN ULTRA WIDEBAND SIGNALS RECEIVING MODE

Abstract

The relations for effective area calculation of arbitrary antenna
array which receives ultra wideband signal are obtained. The effective
area is presented as function of direction of electromagnetic
wave arrival and signal bandwidth. The relations obtained are
used for numerical analysis of effective area and radiation patterns
of 5×5 elements planar antenna array placed above a screen,
which could be a prototype of decameter wavelength radio telescope
phased antenna array subarray. The array radiation patterns
calculated for E and H planes are presented. The maximum
effective area of antenna array receiving ultra wideband signal is
shown to be close to the value of effective area at the central
frequency of the range, and its angular dependence due to frequency
averaging acquires smooth shape, being lobeless out of the area
of the main lobe with significantly decreased level.