Multi-layer patch antenna array design for Ka-band satellite communication

The GeReLEO-SMART project aims to build a communication experiment to be launched on the German technology demonstration mission “Heinrich-Hertz” (H2SAT). On its geostationary orbit it will demonstrate new space appropriate technology of a 26 GHz patch antenna array with integrated low noise amplifiers (LNA), MEMS switching of the RF signal and FPGA mission control. The antenna consists of a multi-layer structure including a pre selector band pass filter to suppress other radio sources on the Heinrich-Hertz satellite. The reception antenna consists of five 2×2 array of circular patch antennas with a feeding network. A temperature stabilized LNA is buried into the PCB stack to minimize transmission line losses in front of it. Two different designs of the antenna array are presented to compare the space qualification by real tests and measurements.