Data Sheet

casambi.com
13
13. Antenna versions
CBM-003B/C is available in two different antenna
versions. CBM-003B is equipped with an on-board
SMD ceramic chip antenna and CBM-003C is
equipped with a 1/4 wavelength dipole antenna.
Usually CBM-003C offers better range, but CBM-003B
is more compact solution.
CBM-003C is delivered with the antenna detached,
so the antenna will have to be soldered in place
before taking the module into use. This is because
the antenna can be soldered in vertical or horizontal
position. The host device application determines which
antenna orientation is more suitable.
CBM-003C is delivered with the antenna detached.
The antenna is a 27 mm long single strand copper
wire and it can be soldered in horizontal or vertical
orientation, depending on the best suitability for the
host application.
The antenna can be bent to fit the host application
better. However, there are some guidelines that need to
be taken into consideration.
1. Make sure that antenna is not in contact with any
kind of metal.
2. The antenna should be places as far away from
any metal structures as possible.
3. The tip of the antenna is especially sensitive
for close by metals.
4. The less bending is done on the antenna,
the smaller impact it haves on the range.
5. Do not use any other kind of antenna, or do not
cut or otherwise modify the delivered antenna.
The antenna is soldered onto the left side solder pad
(the pad closer to the antenna matching components).
When soldering the antenna in horizontal position,
for correct operation, place the antenna so that it fills
the whole length of the soldering pad. This way the
antenna extents over the edge of the module by 23,5-
24,0 mm.
When the antenna is soldered in vertical position,
solder it so that the antenna rises 23,5-24,0 mm over
the PCB surface. Cut the antenna wire from the bottom
side to the desired length. This cutting does not affect
the performance or approvals.
Important!
CBM-003C has been certified with the supplied
antenna and modifying it beyond the instructions given
in this datasheet will void the certification.
CBM-003B on left and CBM-003C on right