A 140 GHz Aperture-Coupled Stacked Patch Antenna in Multilayer PCB Technology

This paper presents an 140 GHz aperture-coupled stacked patch antenna based on a multilayer printed circuit board process, mainly designed for upcoming 6G Device-to-Device (D2D) communication applications. The measurement results of three samples are discussed and evaluated with the corresponding simulations. The antenna achieves a return loss better 10 dB from 126.5 GHz up to 147.2 GHz, resulting in a bandwidth of 20.7 GHz, corresponding to a relative bandwidth of 15.13%. A maximum gain of 7.0 dBi was measured at 136.4 GHz. The influence due to the measurement setup and fabrication tolerances is discussed. This work demonstrates a convenient solution for a scalable high-frequency antenna design with mass production capability. As a result, this concept provides a solution for upcoming D2D communication systems at frequencies around 140 GHz.