Antenna Array Synthesis Through Time Modulation

Poli, Lorenzo and Rocca, Paolo and Oliveri, Giacomo and Lizzi, Leonardo and Massa, Andrea (2011) Antenna Array Synthesis Through Time Modulation. UNSPECIFIED.

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    In the last years, there has been a renewed interest towards the use of time‐modulated arrays (TMAs) thanks to the simplicity in reconfiguring the average pattern of the antenna just modifying the on‐off sequence controlling a set of radio‐frequency (RF) switches. TMAs have been originally introduced for the generation of low and ultra‐low sidelobe patterns for radar arrays [1] thus avoiding the implementation of impracticable excitation tapering with high dynamic range ratios. However, they haven’t received a large diffusion because of the power losses due to the generation of harmonic radiation at multiples of the time‐modulation frequency. As a matter of fact, the periodic modulation of the static excitations causes a shift of the radiated power in the sideband radiation (SR) [2] with a consequent reduction of the directivity of the pattern at the carrier frequency.

    Item Type: Departmental Technical Report
    Department or Research center: Information Engineering and Computer Science
    Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7885 Computer Engineering
    Q Science > QC Physics (General) > QC661 Electromagnetic Theory
    Q Science > QC Physics (General) > QC760 Electromagnetism
    Report Number: DISI-11-176
    Repository staff approval on: 08 Jul 2011

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