Abstract
The upcoming fifth-generation (5G) puts forward higher demand to the volume of antenna system, due to the new introduced frequencies including both sub-6 GHz and millimeter wave (mm-wave) bands. To increase space utilization of future mobile terminals, the shared-aperture antennas have been widely used. In this paper, a broadside sharing-aperture technique is developed so that a 2×2 28 GHz patch array can be nested into a 3.5 GHz perforated patch antenna. The antenna keeps a very compact size of 0.35λ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</inf> ×0.35λ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</inf> ×0.04λ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</inf> , where λ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</inf> is the wavelength in the vacuum at 3.5 GHz. Simulated results show that the antenna has an impedance bandwidth of 6.7% in microwave band and 16.4% in mm-wave band.
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