Efficiency; Antenna-To-Antenna Isolation - Sierra Wireless MC5725 Hardware Integration Manual

CDMA and GSM / UMTS Mini Card Hardware Integration Guide
Table A-7: Minimum Main–Secondary antenna isolation
Main / Diversity (Tx and Rx)
Main (Tx) / GPS
108
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.

Efficiency

Table A‐6 details the minimum total radiated efficiency for
main and, if supported, diversity antennas.
Table A-6: Minimum total radiated efficiency
Transmit (Tx)
Receive (Rx)
a. Total efficiency is measured at the RF connec-

Antenna-to-antenna isolation

(MC57xx / MC8775V / MC878x)
Use a network analyzer to measure isolation between the main
and secondary antenna pairs over the operating Tx / Rx
frequency bands described in Table A‐4 on page 103.
Table A‐7 details the minimum isolation allowed over the
various frequency bands for the applicable antenna pairs.
Antenna pair
When you perform these tests:
• If the antennas can be moved, test all positions for both the
main and secondary antennas.
Collect worst‐case isolation data.
•
• Make sure all other wireless devices (Bluetooth or WLAN
antennas, etc.) are turned OFF to avoid interference. For
details, see Interference from other wireless devices on
page 41.
Note: System performance below the minimum isolation specification
could cause damage to the module, resulting in below-average
system performance.
Proprietary and Confidential
Mode Main
50%
30%
tor. It includes mismatch losses, losses in the
matching circuit, and antenna losses.
Isolation (dB)
850 / 900 band GPS band
8 (cell)
15
a
Diversity
n/a
25%
DCS / PCS /
UMTS band
8 (PCS / UMTS)
15 15
2130114