Design of Dual-Band Antenna in Package with Steerable Beam for 5G mmWave Communication Systems

In this study, we present a dual-band (28/39GHz) 2 by 2 antenna array design on a 10(4+2+4) multi-layer organic substrate with broad bandwidth and higher isolation onto a compact AiP module. In addition, the H-type slot antenna structure can improve interference and isolation between 28 and 39GHz bands. Our AiP measured result shows the return loss is better than 10 dB in 23.5-30.5 GHz range, with ~7 GHz bandwidth and provides a high-gain per element (above ~6 dBi) radiation pattern for 28GHz applications. For 39GHz band, the antenna has 7 GHz bandwidth and provides a 5 dBi gain per element from 38-45 GHz. For initial verification, the direct probing measurement system is utilized to validate 28/39GHz antenna pattern and performance with a package level passive testing. Comparison of radiation pattern between simulation and measurement results, there is a good correlation at S-Parameter. Finally, there are 4-channel transmit beamforming array front-end module for simulating. The 3D beam steering of 2 by 2 antenna array is presented with multi-states at 27GHz, with a maximum realized gain of 11.1dBi achieved in the beam direction (θ=28°, Φ=312°) of quadrant IV. It shows that beamforming can be generated at a specific beam direction by controlling the phase of the signal in each antenna element.