60-GHz Circularly Polarized U-Slot Patch Antenna Array on LTCC

By Hucheng Sun, Yong-xin Guo, Ziliang Wang. IEEE Transactions on Antennas and Propagation, 2013

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Frequency Selective Hybrid Precoding for Limited Feedback Millimeter Wave Systems (2015, background): “Fortunately, large antenna arrays can be packed into small form factors due to the small mmWave antenna size [30], [31].”
Wideband Magneto-Electric Dipole Antenna for 60-GHz Millimeter-Wave Communications (2015, methodology): “To overcome the narrow bandwidth problem of the microstrip antenna, many techniques were reported in the literature, such as the L-probe feed [2], stacked patches [3], U-slot patch [4], cavity backed structure [5], and aperture coupled feed [6].”
Low-Cost Wideband Microstrip Antenna Array for 60-GHz Applications (2014, methodology): “Several CP antenna arrays, operated at the 60-GHz band, were designed by employing the patch antenna, helical antenna, grid antenna, and open loop antenna [10]–[15].”
Low-Cost Wideband and High-Gain Slotted Cavity Antenna Using High-Order Modes for Millimeter-Wave Application (2015, background): “2473658 (LP) [2]–[16] or circular polarization (CP) [17]–[23] at MMW bands can be found in literatures, including the substrate inte-”
A 60-GHz Wideband Circularly Polarized Aperture-Coupled Magneto-Electric Dipole Antenna Array (2016, background): “Although a wide impedance bandwidth can be obtained by applying U-slot patch antenna [6], the 3-dB AR bandwidth is still narrow.”