DESIGN AND TEST OF AN ACTIVE FEED CIRCUIT FOR ANTENNA ARRAYS WITH RECONFIGURABLE PATTERN
Keywords:Active antenna, active feed circuit, microstrip antenna array, phase shifter, reconfigurable pattern, variable gain amplifier
In this paper, the design of an active feed circuit for antenna arrays with reconfigurable radiation pattern is presented. The adopted circuit topology is composed of phase shifters and variable gain amplifiers which enable the dynamic control of the amplitudes and phases of the array current excitations. The set of equations needed to configure the circuit components is derived and the measured patterns of an array fed by the proposed circuit are also shown in the paper, as well as the details for the fabrication of the circuit prototype. The excellent agreement between the theoretical and measured patterns validates both the design procedure and solutions adopted throughout the work.
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