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14.2 BISM2 Module without antenna (special order)
The dimensions for this module are identical to the standard BISM2 illustrated above, but the antenna
is replaced with a U-FL connector.
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The external antenna used must not result in an increased output power. I.e. the total gain of mating
connector, cable and antenna must not exceed +2dB. If a higher gain antenna is connected, it will
invalidate the RF and Bluetooth approvals for the module. The external antenna must provide a 50
Ohm impedance.
The antenna connector is a U.FL connector, supplied by Hirose. Mating connectors with cables are
available from Hirose and their distributors, and also from other cable suppliers. The data sheet for
the connector series is available at http://www.hirose.co.jp/cataloge_hp/e32119372.pdf
14.2.1 External Antennae
A variety of manufacturers can supply external antennae suitable for use with the BISM2 module
without antenna. Users should be aware that the choice of antenna may affect the qualification of the
module.
To ensure that the qualification is not affected, the TOTAL GAIN of the external antenna, including
insertion loss of the connectors and cable must be less than 2dBi. If a higher gain is employed, then
the pre-qualified status of the module will be lost. It is the customer’s responsibility to ensure that
an external antenna does not negate the qualification.
Centurion (www.centurion.com) manufacture a snap-
in external connector of the form generally known as
a “rubber duck” with a 100mm captive lead
terminated in a U.FL connector that is particularly
appropriate for use with the BISM2 module.
The part number is WCR 2400-IP
NovaETS (www.novaets.com) in the UK supply a
rubber duck antenna with U.FL connection.
The ordering information is W-154C 2dB Wireless
LAN Antenna (2.4GHz) Assembled with U.FL (iPX)
Connector.