In this paper, a wideband slot antenna element and its array with stereoscopic differentially fed structures are proposed for the\nradar system. Firstly, a series of slots and a stereoscopic differentially fed structure are designed for the antenna element, which\nmakes it possess a wide bandwidth, stable radiation characteristics, and rather high gain. Moreover, the stereoscopic feeding\nstructure can firmly support the antennaâ??s radiation structure and reduce the influence of feeding connectors on radiating\nperformance. Secondly, a 4 * 4 array is designed using the proposed antenna element. And a hierarchical feeding network is\ndesigned for the array on the basis of the stereoscopic differentially fed structure. For validation, the antenna element and 4 * 4\narray are both fabricated and measured: (1) the measured - 10 dB impedance bandwidth of the antenna element is 62%\n(6.8-12.9 GHz) and the gain within the entire band is 5-9.7 dBi and (2) the measured - 10 dB impedance bandwidth of the array is\napproximately 50% (7 to 12 GHz) with its gain being 14-19.75 dBi within the entire band. Notably, measured results agree well\nwith simulations and show great advantages over other similar antennas on bandwidth and gain.
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