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F-710-017, V1.2 TCM 330 / TCM 330U User Manual | v1.1 | August 2016 | Page 17/62
USER MANUAL V1.1
TCM 330 / TCM 330U
Wireless LED Controller Module
3.5.6
Antenna
3.5.6.1
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.
TCM330 (868.3 MHz) has been approved with whip antenna. Modules based on TCM 330
that are used in Europe do not need additional radio approval if the external antenna 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
TCM330U (902.875 MHz) is designed for use with the following antenna types:
n
EnOcean-defined whip antenna
n
EnOcean-defined helix antenna
n
Chip antenna Mitsubishi Material, Type AM11DG-ST01
TCM 330U is FCC / IC pre-approved (limited modular approval) for these antennas.
Please contact EnOcean for details.
Note that a full FCC / IC approval is needed if TCM 330U modules are used in US /
Canada with antennas other than these specified antennas.