volume | PIER Journals

Abstract

In this paper the design of a cavity-backed slot antenna array with wideband operation and low sidelobe levels is introduced. A High gain metallic antenna array is designed using rectangular waveguides in both the feeding network and cavity-back slots, where a 16×16 array antenna is built with 8×8 subarrays. The antenna is fabricated using direct laser sintering (DLS) and computer numerical control (CNC) milling technology on both sides of each layer to guarantee no field leakage between antenna layers. For the sake of achieving a wide bandwidth in such array, a 1-to-64-way corporate feeding network is used to distribute the power in the lower feeding layer to excite the coupling apertures beneath the subarrays. The excited power coefficients through the array aperture are tapered using quasi-Taylor synthesis, with an even phase so the modified uneven power waveguide-splitter is designed to taper the field amplitudes within the feeding network till reaching the radiating slots. The array achieved a 14% bandwidth, a gain of more than 31.25 dBi over 1.85 GHz, sidelobe levels higher than 23 dB, and cross-polarization levels better than -40 dB, according to measured data.

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Mr. Ibrahim Samy Mohamed

Prof. Mahmoud Abdalla