User's Guide

ManualsBrands3D-P ManualsElectronicsEdge computing and communications platform

Table 2: Recommended LTE Main/Diversity Antenna Specifications

Parameter Requirements Comments

Antenna system

(LTE) External multi-band 2x2 MIMO

antenna system (Ant1/ Ant2)

(3G) External multi-band antenna system with diversity

(Ant1/Ant2)

Operating bands — Antenna 1 All supporting Tx and Rx frequency bands.

Operating bands — Antenna 2

All supporting Rx frequency bands, plus GNSS frequency

bands if Antenna 2 is used in shared

Diversity/MIMO/GNSS mode.

VSWR of Ant1 and Ant2

• < 2:1 (recommended)

On all bands including band edges

• < 3:1 (worst case)

Total radiated efficiency

of Ant1 and Ant2

> 50% on all bands

• Measured at the RF connector.

• Includes mismatch losses, losses in the matching circuit, and

antenna losses, excluding cable loss.

• Sierra Wireless recommends using antenna efficiency as the

primary parameter for evaluating the antenna system.

• 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 can be affected by antenna size, location, design

type, etc.—the antenna gain patterns remain fixed unless one

or more of these parameters change.

Radiation patterns of Ant1 and Ant2

Nominally Omni-

directional radiation pattern in

azimuth plane.

Envelope correlation coefficient

between Ant1 and Ant2

• < 0.5 on Rx bands below 960 MHz

• < 0.2 on Rx bands above 1.4 GHz

Mean Effective Gain

of Ant1 and Ant2 (MEG1, MEG2)

 -3 dBi

Ant1 and Ant2 Mean Effective Gain

Imbalance

I MEG1 / MEG2 I

< 2 dB for MIMO operation

< 6 dB for diversity operation

Maximum antenna gain

Must not exceed antenna gains due to RF exposure

and ERP/ EIRP limits, as listed in the module’s FCC grant.

Isolation between

Ant1 and Ant2 (S21)

> 10 dB

• If antennas can be moved, test all positions for both antennas.

•Make sure all other wireless devices (Bluetooth or WLAN

antennas, etc.) are turned OFF to avoid interference.

Power handling • > 1 W

• Measure power endurance over 4 hours (estimated talk time)

using a 1 W CW signal— set the CW test signal frequency to the

middle of each supporting Tx band.

• Visually inspect device to ensure 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.

From Sierra Wireless AirPrime EM7565 Product Technical Specification (41110788 Rev 11)