Timed arrays of spiral antennas for circularly polarised UWB scanned patterns with low side lobes

Abstract

This research presents a novel design of a timed antenna array of two-arm log spiral antennas. The design consists in optimising the non-uniform antenna positions in order to obtain a scanned energy pattern with low side lobes in time domain. It is utilised the well-known sequential quadratic programming for the optimisation. The nonuniform array is compared with conventional geometries, such as square array and concentric ring array. The resulted timed antenna array is also analysed in frequency domain after the optimisation in time domain. The results revealed good performance of the non-uniform timed antenna array for ultra wide band, circular polarisation, beam scanning and low side lobes.

Time‐modulated sparse linear array synthesis with minimum elements and a specific sidelobe

“…Besides, different beam patterns can also be obtained by optimisation [6, 7]. Many algorithms such as the particle swarm optimiser (PSO) [8, 9], differential evolution [8, 10, 11], and genetic algorithm (GA) [12] are proved useful.…”

“…In [3], the equivalent TMSLA, which obtained by the PSO, is used to realise the same performance in a TMLA. In [8], a novel design of a non‐uniform TMA was proposed to obtain a scanned energy pattern with low side lobes in a time domain. In [16], a more efficient algorithm is proposed and used to optimise a TMSLA.…”

A New Strategy to Design Microstrip Antenna Array With Low Side-Lobe Level and High Gain

“…In [11], an adaptive particle swarm optimization method is used to adjust the excitation phase and thus suppress the first SLL of large phased arrays to minimum possible level. In [28], the location of the circularly polarized antenna element is optimized in the array based on the sequential quadratic programming and low SLL is obtained for each scanning energy pattern.…”

Shared Aperture Multibeam Forming of Time‐Modulated Linear Array

“…Besides, in recent works, novel timed arrays of linear polarised Vivaldi antennas have been proposed [27]. Novel techniques for circularly polarised UWB-scanned patterns were explored with low sidelobes in [28]. Unlike [18][19][20][21][22][23][24][25][26], the present study can create beams at more than two different desired directions.…”