Measure Rf Port Return Loss; Iso-18000-6C Tag Inventory; Real Time Mode - IDTECK RF900I-8 User Manual

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2.2.4 Measure RF Port Return Loss

Measure the return loss of the antenna port on the interface as shown in the figure below:

Before measuring, you need to set the current working antenna port. The default antenna working port is 1. When

measuring the return loss of other antenna ports, you need to set the corresponding working antenna.

In the actual application environment, the working status of the environment in front of the antenna can be

preliminarily determined by reading the return loss value of each frequency point of the current working antenna. The

larger the return loss value, the smaller the electromagnetic wave reflection in front of the antenna. If the measured

return loss of the antenna product port is less than or equal to 10dB, it indicates that the electromagnetic wave

reflection in front of the antenna is too large. At this time, it is necessary to reduce the RF output power or adjust the

antenna installation position. The return loss of the antenna port and VSWR are two different expressions of the same

concept. The corresponding relationship is shown in the following table:

Return loss of antenna port (dB) Standing wave ratio (VSWR) of antenna port

2.3

After correctly connecting the reader and setting the RF parameters, you can read and write tags.

Inventory tags, that is, recognizes the EPC code of multiple tags at the same time.This is the core funtion of UHF

RFID Reader and one of the standards to judge a reader's performance.

The most commonly used mode is the real-time mode, which means uploading immediately after reading the EPC

number of the tag. The user can get the EPC number of the tag as soon as possible.

The advantage of the real-time mode is that the multi-tag recognition performance is good, the response is fast, and

the user can get the tag data in the first time without delay. And RSSI (tag signal strength indicator), frequency

1.02

1.11

1.22

1.29

1.43

1.92

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