B&B Electronics APXN-Q5428 - User Manual - Manual (Page 19)

AirborneM2M™ Users Guide B&B Electronics, Inc.
1/9/2014 19
7.0
Antenna
The unit supports antenna connection through two (2) RP-SMA connectors, located on
the sides of the enclosure.
Any antenna used with the system must be designed for operation within the 2.4GHz ISM
band and specifically support the 2.412GHz to 2.482GHz for 802.11b/g, the 5GHz ISM
band and must specifically support 5.1GHz to 5.9GHz for 802.11a operation. They are
required to have a VSWR of 2:1 maximum referenced to a 50

system impedance.
7.1 Antenna Selection
The Airborne radio supports a number of antenna options. The correct antenna
option will be determined by a number of factors, including consideration of the
application, mechanical construction and desired performance. Since the number
of possible combinations is endless we will review some of the more common
solutions in this section. If your application is not covered during this discussion
please contact Technical Support for more specific answers.
Due to FCC/IC regulatory restrictions only antenna covered by the approvals
listed on the device may be used with the device. Please contact Technical
Support for a full list of approved antenna.
7.2 Antenna Location
Antenna location can determine the success or failure of the Wi-Fi
implementation.
There are several factors that need to be considered when choosing the location:
 Distance of Antenna from radio
 Location of host system

Proximity to RF blocking or absorbing materials

Proximity to potential noise or interference

Position relative to infrastructure (Access Points or Laptops)
 Orientation of host system relative to infrastructure

Is it known

Is it static
To minimize the impact of these factors, take the following steps during the
development process:
 Minimize the distance between the radio and the antenna. As the length of
the connecting cable increases, so does the negative impact on Transmit
Power and Receive Sensitivity.
 Avoid situations where metal surfaces come into contact with the antenna, or
are close to the location of the antenna.
 Avoid locations where RF noise or overlapping ISM bands may be present.
This would include microwave ovens and wireless telephone systems in the
2.4GHz and 5.0GHz frequency range.
 Elevate the antenna as much as you can.