Linear Antenna Array with Suppressed Sidelobe and Sideband Levels using Time Modulation

TL;DR

This paper presents a method to significantly reduce sidelobe and sideband levels in a linear antenna array by dynamically modulating element excitations over time, optimized via genetic algorithms.

Contribution

It introduces a novel time modulation approach with optimized excitation patterns that outperform previous uniform amplitude methods in sidelobe and sideband suppression.

Findings

Achieved ultra low SLL and SBL levels through dynamic excitation control.

Optimized excitation patterns outperform fixed amplitude arrays.

Genetic Algorithm effectively minimizes sidelobe and sideband levels.

Abstract

In this paper, the goal is to achieve an ultra low sidelobe level (SLL) and sideband levels (SBL) of a time modulated linear antenna array. The approach followed here is not to give fixed level of excitation to the elements of an array, but to change it dynamically with time. The excitation levels of the different array elements over time are varied to get the low sidelobe and sideband levels. The mathematics of getting the SLL and SBL furnished in detail and simulation is done using the mathematical results. The excitation pattern over time is optimized using Genetic Algorithm (GA). Since, the amplitudes of the excitations of the elements are varied within a finite limit, results show it gives better sidelobe and sideband suppression compared to previous time modulated arrays with uniform amplitude excitations.