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What is the effective range of radio waves that Smart RFID Reader can generally receive?

2020-08-28    

        The receiving range of Smart RFID Reader will be affected by many factors, such as the frequency of the radio wave and the size and shape of the tag, as well as the energy of Smart RFID Reader, the interference of metal objects, and of course other radio frequency devices. In general, the receiving distance of low-frequency passive tags is generally within one foot, the receiving distance of high-frequency passive tags is about three feet, and the receiving distance of UHF tags is ten to twenty feet.

Smart RFID Reader

        So for semi-active and active tags that use batteries, Smart RFID Reader can receive signals 300 feet or more away. For low-frequency and high-frequency radio frequency, if the size of the tag and Smart RFID Reader antenna is the same, the receiving distance can be calculated by multiplying the diameter of the antenna by 1.4. This rule applies to diameters less than thirty centimeters.

        What do LF, HF and UHF stand for?

      Similar to the radio we listen to, RF tags and Smart RFID Reader also need to be modulated to the same frequency to work. LF, HF, UHF correspond to radio frequencies of different frequencies. LF stands for low frequency radio frequency, around 125KHz, HF stands for high frequency radio frequency, around 13.54MHz, UHF stands for ultra high frequency radio frequency, in the range of 850 to 910MHz

      Why use different frequencies for operation?

      There are 4 frequency bands in operation, low frequency (125KHz), high frequency (13.54MHz), ultra high frequency (850-910MFz), microwave (2.45GHz). In fact, each of them has its own characteristics. It is used in different fields, so to use it correctly, you must first select the appropriate frequency.

 


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