A Complementary Circularly Polarized Antenna for 60-GHz Applications

Design of a wideband substrate integrated waveguide antenna with high‐gain employing two bow‐tie‐shaped slots

“…The antenna gains in [2, 3, 10, 14] are better than 10 dBi, but the structures of the antenna are too complicated to implement. In [4–9, 15–18], some antennas with impedance bandwidths >40% and compact size are investigated but the antenna gain <13 dBi and radiation efficiency <85% still limit antenna applications. In contrast, the antenna designed in this work has the characteristics of broadband, high gain and high efficiency.…”

A Wideband Circularly Polarized Magnetoelectric Dipole Antenna for 5G Millimeter-Wave Communications

“…In the course of designing ME dipole antennas [ 12 , 13 ], less attention has been paid to CP ME dipole based antennas. In the past few years, some CP antennas based on ME dipole structures have been reported [ 8 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. In [ 14 ], an ME dipole structure was reported to use a pair of bowtie patch antennas and a pair of trapezoidal-shaped dipoles fed by a Wilkinson power divider to achieve a 3 dB AR bandwidth of 33%.…”

“…However, the drawback of these antennas was their huge volume which limits their usage in modern electronic devices and sensors. On the other hand, the CP ME antennas designed at 60 GHz band offer wide AR bandwidth/high gain at the expense of large antenna size [ 19 , 20 , 21 ]. In [ 22 ], the AR bandwidth of the ME dipole antenna was significantly improved (53%) by employing a novel crossed feeding structure.…”

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

“…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.…”

“…By exciting the one-quarter wavelength separated slot and electric dipole simultaneously, unidirectional characteristic with low back-lobe can be obtained. [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.…”