Abstract
A wideband, low cross-polarization, high-gain, and wide-angle scanning antenna array is presented in this paper. The antenna array contains 8 subarrays in the horizontal dimension, and each subarray contains 4 unit cells. A two-side printed dipole with an amendatory equivalent circuit model is adopted, and the metal vias are introduced in the element design to ameliorate the cross-polarization level. A radome, acting as the wide-angle impedance matching layer, is introduced to achieve wide-angle scanning. A prototype of a 4 × 8 array is fabricated and measured. The results show that the operating bandwidth of aperture efficiency (BWAE) above 60% is about 26.7% from 2.6 GHz to 3.4 GHz. The measured scanning loss in the H-plane is 2.7 dB when scanning up to 60° with active voltage standing wave ratio (VSWR) <3, and the gain can achieve 21 dB at 3 GHz with a cross-polarization level below −30 dB at all angles.
Highlights
Phased-array antennas are widely used in enhancing the gain, angular resolution, and antijamming capability of radar systems and modern communication systems [1]
The scanning performance of the phased array often suffers from an increasing scanning loss and crosspolarization when the main beam is steered off the broadside direction [2]. is is mainly caused by the radiation performance and scanning impedance of the array elements
A prototype array has been fabricated and measured. e results show that the operating bandwidth of aperture efficiency above 60% is about 26.7% from 2.6 GHz to 3.4 GHz. e measured scanning loss is only 2.7 dB when scanning up to 60° with active voltage standing wave ratio (VSWR)
Summary
Phased-array antennas are widely used in enhancing the gain, angular resolution, and antijamming capability of radar systems and modern communication systems [1]. To achieve low cross-polarization of the antipodal dipole array, a tapered balun with the via, groove, and shorting line is designed in [8]. Two sets of metalized vias are introduced to compensate for the asymmetry of the structure, and the cross-polarization of the unit cell can achieve less than −58 dB in the range of −10 dB of the main beam. E results show that the operating bandwidth of aperture efficiency above 60% is about 26.7% from 2.6 GHz to 3.4 GHz. e measured scanning loss is only 2.7 dB when scanning up to 60° with active VSWR
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