Abstract
Radiation in the display direction of 5G mm-wave antenna in mobile phones is challenging due to the obstruction from display. In this paper, a shared-aperture 4G LTE and 5G mm-wave antenna in mobile phones with enhanced mm-wave radiation in the display direction is studied. The 5G mm-wave array, consisted of four slot elements, is constructed in the clearance of 4G LTE antenna. For the shared-aperture design, the inter-digital coupling (IDC) structure, which has a slight effect on the 4G LTE antenna, is used as the ground of the slot element. To enhance the mm-wave radiation in the display direction, two groups of floating patches are applied. For the 4G LTE antenna, the measured -6 dB impedance bandwidths are 280 MHz (700-980 MHz) and 1220 MHz (1700-2920 MHz). The measured efficiency is higher than 40%. For the 5G mm-wave array, the measured overlapped -10 dB impedance bandwidth is 2.7 GHz (25.1-27.8 GHz). The measured mutual coupling among each element is lower than -16 dB. Within the 25.5-27.5 GHz, in the display direction, the measured peak gain is 10.4 dBi and the 3dB beam steering range reaches to 90° (45° to 135°) with gain higher than 7.5 dBi.
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