Eco-friendly based substrates for telemetry antennas in UHF- and S-bands

A circularly polarized (CP) patch antenna and a CP 2×2 antenna array on thick (0.075 λ450MHz and 0.11 λ2300MHz respectively) polypropylene substrates are introduced; the numerical design and the manufacturing concept are presented. Two prototypes are characterized and validated for different applications. The first prototype is used for communication and telemetry around 450 MHz between the autopilot of a UAV and the ground station. The second antenna is used both for flight tracking and telemetry at around 2300 MHz.