ANTENNAS
Dragonfly
TM
MTQ-LSP3-B03 Device Guide
17
SMA to U.FL Cables
The developer kit includes three 4.5" SMA to U.FL cables which are preinstalled on the developer board. Consult
the mechanical drawings for your device to determine which antenna to connect to which U.FL connector on the
device.
Connecting an Antenna through the Developer Board Connectors
To connect an antenna to the device through the developer board:
1.
Determine which SMA connector you want to use for the antenna.
2.
Finger tighten the antenna to the SMA connector.
3.
Attach the U.FL connector from the cable to the connector on the device.
G = GPS (may not apply to your device)
M = Main
D = Diversity
Antenna Diversity
Antenna diversity uses two receive antennas to improve the downlink connection (cell tower to mobile). It has no
effect on the uplink (mobile to cell tower).
Antenna diversity is useful in environments where the signal arrives at the device after bouncing off or around
buildings or other objects. The bounced signal may be attenuated by going through semi-transparent (to the
signal) objects. Each signal alteration can change its magnitude, phase, orientation, or polarization. This complex
environment can exist in cities, inside buildings or in traffic. In this environment, signal paths from the cell tower
form an interference pattern of peaks and nulls. These peaks and nulls can be very close together.
