Specifications

AirPrime Embedded Module Hardware Integration Guide
94 Proprietary and Confidential 2130114
In addition to passing the specific tests described in Tes tin g on page 94, the
diversity path antenna should satisfy the following requirement:
• Receive performance, measured by forward link throughput, must be 0 to
3 dB better than a single antenna
Performance goals
When designing the antenna system, consider the following performance goals:
• 0 dB gain antenna (or better)
• Diversity antenna receive performance to be similar to primary antenna
• Separation distance or polarity separation to achieve diversity antenna
isolation of 10 dB (minimum). Otherwise the receive antenna picks up too
much power radiating from the primary antenna
GPS antenna design requirements
(MC57xx/MC8775V/MC878x/MC879x)
A second antenna is required to access GPS functionality—if the modem also
supports diversity, the same antenna can be used.
In addition to passing the specific tests described in Tes tin g on page 94, the
diversity path antenna should satisfy the following requirements:
• Field of view (FOV): Omni-directional in azimuth, -45
 to +90 in elevation
• Polarization (average Gv/Gh): > 0 dB. Vertical linear polarization is sufficient
(no need to optimize for circular polarization)
• Free space average gain (Gv+Gh) over FOV: > -6 dBi (preferably > -3 dBi).
Note: Average gain is the sum of average values (Gv + Gh) where both Gv
and Gh are measured (and averaged) over -45
 to +90 in elevation and ±
180
 in azimuth.
• Maximum gain and uniform coverage in the high elevation angle and zenith.
Gain in the azimuth plane is not desired.
• Average 3D gain: > -5 dBi
• Typical VSWR: < 2:1
• Polarization: Any other than LHCP (left-hand circular polarized) is acceptable.
The same design procedures outlined in Interference and sensitivity on page 41
apply to the GPS path as well.
Testing
The performance specifications described in this section are valid while the
antenna is mounted in the host device with the antenna feed cable routed in its
final application configuration.
The following guidelines apply to the tests in this section:
• Perform electrical measurements at room temperature (+20°C to +26°C)
unless otherwise specified