Impinj Guardwall Antenna


For item-level reading of packed goods, the Guardwall antenna provides a tightly controlled read zone and intense RF field, critical to penetrating deep into packed cases. When used as a pair, the Guardwall antenna absorbs energy from its opposing mate so that very little passes beyond the exterior face. This configuration maximizes stray read rejection by constraining the read zone to the area within the two antennas. It also increases read reliability by maximizing the intensity within the read zone.

Environmental Specifications

Parameter           Typical        Units          Conditions/Notes

IP Rating               IP51                              Indoor use only
Temperature 0–40 Celsius Indoor use only
Humidity 5–95 Percent Relative, non-condensing
RoHS N/A Designed to meet RoHS, but not certified RoHS

Electrical Specifications

Parameter                      Typical                  Conditions/Notes
Frequency range (FCC) 902–928 MHz North America
Frequency range (ETSI) 865–868 MHz Europe Far Field Gain 6 dBi
Polarization RHCP & LHCP Dual elements with separate connectors for two circular polarizations (RHCP and LHCP) Axial Ratio (Max) 3 dB
3-dB Beamwidth 55 Deg
Front to Back Ratio 22 dB
VSWR* 1.5:1 50 Ω reference
Input Power 30 dBm 30 dBm absolute max * Some item-level applications—where the tag is close to the reader antenna—can cause a 2:1 VSWR from the antenna to the reader. Users
should ensure that their reader can tolerate a VSWR as high as 2:1.

Mechanical Specifications

Parameter           Typical                            Conditions/Notes

Weight                 11 lbs/5 kgs

Connector             2X SMA female                  Requires accessory cable to connect to
                                                                    reader’s RP-TNC connector
Radome                ABS                                   Designed to meet RoHS, but not certified RoHS

Backplane             Aluminum,                         Class 3 iridite finish                           
                           Alloy 5052 H32 
Enclosure             Aluminum,                          Designed to meet RoHS, not certified RoHS 
                           painted black
Dimensions          27.6in x 15.8in x 2.9in         See drawing for detailed dimensions
                          702mm x 402mm x 73mm




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