EnOcean GmbH STM300U 사용자 설명서

USER MANUAL

TCM 300x / TCM 320x User Manual | Page 24/54

TCM 300 / TCM 300C / TCM 300U

TCM 320 / TCM 320C / TCM 320U

4.2 Antenna options TCM 300x

4.2.1 Overview
Several antenna types have been investigated by EnOcean. Please refer to our application

notes AN102, and AN105 which give an overview on our recommendations.

All TCM3x0 modules have been approved with whip antenna, and TCM300U with helical
antenna in addition.

868.300 MHz modules used in Europe do not need additional approval if the external an-
tenna fulfils the following requirements:

Frequency
band

868.300 MHz
ISM

Antenna must be suited for this band

Antenna type

Passive

Mandatory for radio approval

Impedance

~50 Ohm

Mandatory for radio approval

Maximum gain ≤ 0 dBd

Mandatory for radio approval

In addition it is important to fulfill the following requirements in order to achieve compati-

bility with other EnOcean products and to ensure excellent EMI robustness:

VSWR

≤ 3:1

Important for compatibility with EnOcean protocol

Return Loss

> 6 dB

Important for compatibility with EnOcean protocol

Bandwidth

≤ 20 MHz

Important if 10 V/m EMI robustness required for device

For 315 MHz / 902.875 MHz modules (TCM 300C / TCM 300U) please note
that a full approval is needed if modules are used with antennas other than
the specified antennas.

4.2.2 Whip antenna

315 MHz

Antenna: 150 mm wire, connect to RF_WHIP

Minimum GND plane: 50 mm x 50 mm

Minimum distance space: 10 mm

868.3 MHz

Antenna: 86 mm wire, connect to RF_WHIP

Minimum GND plane: 38 mm x 18 mm

Minimum distance space: 10 mm

902.875 MHz

Antenna: 64 mm wire, connect to RF_WHIP

Minimum GND plane: 50 mm x 50 mm

Minimum distance space: 10 mm