Time-Modulated Arrays With Haar Wavelets

Time-modulated arrays (TMAs) can effectively perform beamsteering over the first positive harmonic pattern by applying progressively delayed versions of stair-step approximations of a sine waveform to the antenna excitations. In this letter, we consider synthesizing such stair-step sine approximatio...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2020-11, Vol.19 (11), p.1862-1866
Main Authors: Maneiro-Catoira, Roberto, Bregains, Julio, Garcia-Naya, Jose A., Castedo, Luis
Format: Article
Language:English
Subjects:
Amplitude modulation
Antenna arrays
Bandwidth
Beamsteering (BS)
Continuous wavelet transforms
Haar wavelets
Harmonic analysis
Switches
Time-frequency analysis
time-modulated arrays (TMAs)
Trigonometric functions
Waveforms
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Summary:Time-modulated arrays (TMAs) can effectively perform beamsteering over the first positive harmonic pattern by applying progressively delayed versions of stair-step approximations of a sine waveform to the antenna excitations. In this letter, we consider synthesizing such stair-step sine approximations by means of Haar wavelets. Haar functions constitute a complete orthonormal set of rectangular waveforms, which have the ability to represent a given function with a high degree of accuracy using few constituent terms. Hence, when they are applied to the TMA synthesis, employing single-pole double-throw switches, such a feature leads to an excellent rejection level of the undesired harmonics as well as a bandwidth greater than that supported by conventional TMAs with on-off switches.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2020.2986832