A novel low-profile slot antenna with unidirectional radiation

Abstract

This paper studies the radiation performance of the complementary half-wavelength slot and electric dipole combination with discrete port excitation. With the modified slot ground plane, unidirectional radiation has been achieved. The entire antenna structure can be implemented with a low-profile single-layer PCB board.

Low‐profilecomplementary dipole antenna under quadruple mode resonance with nearly equal E‐ andH‐planepatterns

“…Compared to the nonplanar antennas, 9,13,21,37,40,50 the proposed antenna has a relative lower profile and lower configuration. Compared to the antennas with low profile (i.e., height < 0.1λ g ), 22,24,25,39 the proposed antenna has a wider impedance bandwidth, F I G U R E 9 Simulated and measured radiation performances of the antenna prototype, (A) front-to-back ratio, and (B) boresight gain and efficiency higher front-to-back ratio and nearly equal E-and Hplane radiation patterns. In general, it can be concluded that the proposed antenna can exhibit unidirectional radiation with low profile and simple configuration compared to most of the existing complementary dipole antennas.…”

“…The fourth one is the slot-dipole combined antenna. [29][30][31][32][33][34][35][36][37][38][39][40] A slot radiator cut on the metallic plane serves as a magnetic dipole, 41 while its inherent bi-directional radiation may be a drawback. 42,43 In this case, a metallic cavity box 44 or a plane reflector 45 should be backed one-quarter wavelength to the slot for back lobe suppression and enhanced impedance matching.…”

“…[29][30][31][32][33][34][35][36][37] More recently, preliminary studies on the combination of slot etched on large ground plane and electric dipole with reduced separation have been presented. 38,39 Nevertheless, multiple parasitic slits should be required to reduce the ground plane's image effect to the electric dipole. This may add additional complexity to the design and fabrication of the antenna.…”