Peak Gain And Radiation Patterns; Fading Correlation Coefficient - Sierra Wireless MC5725 Hardware Integration Manual

Rev 1.9.1 Feb.09
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.

Peak gain and radiation patterns

Table A‐8 describes the peak and average antenna gain limits
for the main path and diversity path antennas.
Note: Sierra Wireless recommends using antenna efficiency as the
primary parameter for evaluating the antenna system.
Antenna Peak Gain is not a good indication of antenna performance
when integrated with a host device; the antenna does NOT provide
omni-directional gain patterns. Peak Gain performance can be
affected by parameters such as antenna size, location, design type,
etc. The antenna gain patterns remain fixed unless one or more of
these parameters changes.
Table A-8: Peak and average antenna gain
Antenna
Main
Diversity
a. Vertical / horizontal polarizations
b. Vertical / horizontal polarizations combined, over ±45° in eleva-
tion and ±180° in azimuth

Fading correlation coefficient

(MC57xx / MC878x)
Measure the fading (envelope) correlation coefficient between
the main and diversity antennas over the operating Rx
frequency bands described in Table A‐4.
The maximum allowed fading correlation coefficient over any
of the bands is 0.5.
Proprietary and Confidential
Antenna Specification
a
Peak gain Average gain
> +1 dBi > -3 dBi
> -3 dBi > -6 dBi
b
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