Stacked patch array in LTCC for 28 GHz antenna-in-package applications

An antenna array is designed with 2×8 45-degree polarized stacked patches around 28 GHz in low temperature co-fired ceramic (LTCC) for the applications of the fifth-generation wireless communication (5G). As demonstrated by the measured reflection coefficient and realized gain response, the bandwidth is broadened when compared with single-patch array. The proposed antenna-in-package (AiP) can operate from 26.3 to 29.8 GHz, with the maximum realized gain of 15.1 dBi, the 3-dB beamwidth of 11° and the estimated efficiency of 55%. Reasonable agreement is achieved between the measured and simulated results. The AiP arrays on LTCC show a promising foreground for 5G high-frequency applications.