Novel Integrated Design of Dual-Band Dual-Polarization mm-Wave Antennas in Non-mm-Wave Antennas (AiA) for a 5G Phone with a Metal Frame

Abstract

A novel integrated design of dual-band dual-polarization millimeter-wave (mm-Wave) antennas in a non-mm-Wave antenna (AiA) for a cellular phone with a metal frame and a high screen-to-body ratio over 91.5% for the fifth generation mobile communications (5G) is presented to achieve high compatibility with metal-exterior designs, good conformal ability to challenging product shapes, and compact space for the mmWave and non-mm-Wave antennas. The mm-Wave antennas based on 5 dual-band dual-polarization stacked patch antennas form a linear antenna array embedded in the metal frame which serves as a long-term evolution (LTE) antenna. From simulations, in terms of input reflection coefficients |Snn| ≥ -10 dB, the bandwidths of the vertical ports (V-ports) in the 5G mmWave antenna array for the vertical polarization (V-pol.) range from 27.44 GHz to 28.56 GHz and from 36.92 GHz to 40.22 GHz; similarly, the bandwidths of the horizontal ports (H-ports) in the 5G mm-Wave antenna array for the horizontal polarization (H-pol.) range from 27.32 GHz to 28.56 GHz and from 36.96 GHz to 40.34 GHz, respectively. Thus, the two popular 5G mm-Wave bands of n261 and n260 in the third generation partnership project (3GPP) can be covered. Besides, for the low band (band n261) and high band (band n260), the maximum (max.) peak realized gains of the V-pol. in the plane of theta = 90° are 11.49 dBi and 13.27 dBi, and the max. scanning angles are both 45°, respectively. Similarly, the max. peak realized gains of the H-pol. in the plane of theta = 90° in the low band and high band are 11.35 dBi and 12.18 dBi, and the max. scanning angles are 60° and 30°, respectively. The bandwidths of| Snn| ≤ -6 dB for the LTE antenna can cover from 872 MHz to 962 MHz and from 2265 to 2740 MHz so that LTE Band 8, Band 40, and Band 41 can be accommodated with antenna efficiencies higher than -3.43 dB in the low band (Band 8) and higher than -1.72 dB in the high band (Band 40 and Band 41). Also, the mm-Wave antenna array can attain right-hand and left-hand circular polarizations.