A wideband high-efficiency circularly polarized (CP) dual-coil antenna array is presented for 60-GHz applications in this letter. The proposed CP dual-coil antenna is composed of a resonant substrate-integrated cavity...
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A wideband high-efficiency circularly polarized (CP) dual-coil antenna array is presented for 60-GHz applications in this letter. The proposed CP dual-coil antenna is composed of a resonant substrate-integrated cavity (SIC) and a pair of centrally symmetrical coils, which are fed differentially by a substrate-integrated waveguide (SIW) coupling slot. A novel sequentialrotation feeding technique is introduced to enhance the axial ratio (AR) and impedance bandwidths of both the 2 x 2 subarray and the 4 x 4 array. The proposed feeding network significantly improves radiation efficiency. The measured results of the fabricated prototype indicate that the proposed array achieves an impedance bandwidth of 20.8% (54.6-67.3 GHz) for |S11| <= -10 dB, a 3-dB AR bandwidth of 21.5% (54-67 GHz), a high radiation efficiency of 96.6%, and a peak gain reaching 19.3 dBic at 58 GHz. The proposed circularly polarized (CP) antenna element and array design stand out as strong contenders for 60-GHz wireless applications.
In this letter, a compact wideband circularly polarized patch antenna array is proposed to cover the 57-71 GHz hand. The antenna array is constructed by 45 degrees inclined slits loaded circular radiating patches with...
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In this letter, a compact wideband circularly polarized patch antenna array is proposed to cover the 57-71 GHz hand. The antenna array is constructed by 45 degrees inclined slits loaded circular radiating patches with rectangular back cavities, two-layer sequentialrotation feed networks, and a waveguide transition. Novel self-sequentialrotation technology is introduced using a dual-high-order-mode cavity to improve the axial ratio (AR) and impedance bandwidths of the subarray. Compared with conventional sequentialrotation feed networks, the proposed feeding scheme provides higher aperture efficiency. A 4 x 4 patch antenna array is fabricated using standard printed circuit board technology. Measured results show that the -10 dB impedance and 3 dB AR overlapped bandwidth is 23.8% (57-723 GHz). The measured peak gain is 20.5 dBic with an aperture efficiency of 87.7% at 66 GHz.
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