Title :
Concept of an interlaced phased array for beam switching
Author :
Reddy, C.A. ; Janardhanan, K.V. ; Mukundan, K.K. ; Shenoy, K.S.V.
Author_Institution :
Vikram Sarabhai Space Centre, Trivandrum, India
fDate :
4/1/1990 12:00:00 AM
Abstract :
A novel concept is described for feeding and phasing a large linear array of N antenna elements using only three or five feed points and phase shifters and still achieving beam switching. The idea consists of drastically reducing the number of input points by interlacing a small numer of serially fed subarrays which are suitably phased. This so-called interlaced phased array (IPA) concept was tested using an array of 15 four-element Yagi antennas with a spacing equal to 0.8 wavelengths and found feasible. Some of the distinct advantages of the IPA in comparison with a conventional system of beam switching are reduced power loss, reduced phasing errors, reduced cost, increased reliability resulting from greatly reduced number of phase shifters, and better symmetry of off-zenith beams
Keywords :
antenna feeders; antenna phased arrays; phase shifters; radar antennas; HF; UHF; VHF; beam switching; feed points; four-element Yagi antennas; interlaced phased array; linear array; off-zenith beams; phase shifters; radar probing; serially fed subarrays; Antenna arrays; Antenna feeds; Atmosphere; Butler matrix; Directive antennas; Hafnium; Ionosphere; Linear antenna arrays; Phase shifters; Phased arrays;
Journal_Title :
Antennas and Propagation, IEEE Transactions on