Enhancement and Optimization of High-Power Ku-Band Metallic Waveguide Radar Array Antenna: Large Efficiency, Wide Band and Low Side Lobe Level.

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Bibliographic Details
Title:	Enhancement and Optimization of High-Power Ku-Band Metallic Waveguide Radar Array Antenna: Large Efficiency, Wide Band and Low Side Lobe Level.
Authors:	Mohamed, Ibrahim S.¹ ibrahim.s.mahmoud@ieee.org, Abdalla, Mahmoud²
Source:	Progress in Electromagnetics Research C. 2025, Vol. 159, p111-123. 13p.
Subjects:	Radar antennas, Rectangular waveguides, Waveguides, Antennas (Electronics), Milling (Metalwork), Laser sintering
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 16x16 array antenna is built with 8x8 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. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
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 16x16 array antenna is built with 8x8 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. [ABSTRACT FROM AUTHOR]
ISSN:	19378718
DOI:	10.2528/PIERC25052311