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Antenna Interface
The W24 antenna connector is the RF interface to the WLAN network.
The antenna interface consist of an MMCX type connector, which has impedance matched to 50
at the relevant WLAN 802.11 b/g frequencies.
The antenna or antenna application must be installed properly to achieve best performance.
Table 2-15
It is the Integrator's responsibility to design the antenna or antenna assembly used with the W24.
This will highly affect the RF performance of the W24 (signal quality, current consumption etc.).
The following guidelines should be followed:
Make sure that the antenna or antenna assembly matches the Antenna Interface
•
Specifications.
Use low loss RF cable and connectors keeping cable runs to a minimum.
•
In order to prevent mutual interference between the GSM and the WLAN antennas in stacked
•
configuration, a minimum distance that provides a 30dB isolation is required. To achieve the
required 30dB isolation between the antennas, a distance of about 7cm from each other
should be kept when using a monopole isotropic antenna with 0dBi and appropriate return
loss.
May 31, 2008
gives the antenna interface specifications.
Table 2-15: Antenna Interface Specifications
Parameter
WLAN 802.11b/g band
Gain
Impedance
VSWR
Module Hardware Description
Chapter 2: Hardware Interface Description
Specifications
2400 MHz - 2483.5MHz
0 dBi
50Ω
Less than: 2.5:1
Ω
33
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