User Manual

USER MANUAL V1.05
© 2013 EnOcean | www.enocean.com STM 330 / STM 331 / STM 330C / STM 332U / STM 333U User Manual V1.10 | Page 25/33
STM 330 / STM 331 / STM 330C / STM 332U / STM 333U
4.5.2 Helical antenna (STM 331 / STM 333U)
868 MHz/902 MHz
Antenna recommendation:
STM 33x without host PCB STM 33x with host PCB
Host PCB GND plane
Glass, wood, concrete, metal
868/902 MHz: > 2 mm
315 MHz: > 4 mm
868/902 MHz: > 5 mm
315 MHz: > 10 mm
Plastic