A 60 GHz Compact Multidirectional-Beam Antenna-in-Package for Mobile Devices

Abstract

This letter proposes a new concept of a compact multidirection-beam antenna-in-package (AiP) for mobile devices. The AiP is the first integration of three vertically polarized millimeter-wave endfire horn antennas and a broadside horn antenna on a single substrate to cover four directions. The antennas are able to connect to radio frequency integrated circuits (RFICs) situated in the cavity at the backside of the substrate using bond wires. The size of the fabricated AiP is 6 mm × 6 mm × 1.5 mm (=1.2 <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> × 1.2 <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> × 0.3 <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> ) including 0.3 mm thickness of RFICs. The impedance bandwidth ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$| {{S_{11}}} | &lt; - \text{15 dB}$</tex-math></inline-formula> ) fully covers the 60 GHz band (57–66 GHz). The measured boresight gain of the endfire antenna and the broadside antenna is 5 dBi at 57 GHz and 6.3 dBi at 60 GHz, respectively.