Antenna Design; General Antenna Design Requirements; Main Antenna Design Requirements - Sierra Wireless MC5725 Hardware Integration Manual

CDMA and GSM / UMTS Mini Card Hardware Integration Guide
104
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.

Antenna design

Design of main path, diversity path, and GPS antennas is
determined by the host device OEM and their designated
antenna designer.
Note: Modems that support diversity and GPS can use the same
secondary (diversity) antenna for both.
Note: Antennas should be designed BEFORE the industrial design is
finished to make sure that the best antennas can be developed.

General antenna design requirements

In addition to passing the specific tests described in Testing
beginning on page 106, the main path and diversity / GPS path
antennas should satisfy the following requirements:
Antenna impedance at feeding terminal = 50
•
matching circuit with six or fewer components is acceptable
at the feeding terminal.)
Nominally omni‐directional radiation pattern in the
•
azimuth plane

Main antenna design requirements

In addition to passing the specific tests described in Testing
beginning on page 106, the main path antenna should satisfy
the following requirements:
• Must handle 2 W RF power on low bands and 1 W on high
bands
Measure the power using the following criteria:
Measure power endurance over a period of 4 hours
•
(estimated talk time) using a 2 W CW signal—set the
frequency of the CW test signal to the middle of the PCS Tx
band (1880 MHz for PCS).
Visual inspection must prove there is no damage to the
•
antenna structure and matching components.
VSWR / TIS / TRP measurements taken before and after this
•
test must show similar results.
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