RFID Cable and Ends
SkyRFID understands how important the cable and ends are to the overall read performance in an RFID implementation. If you don't have the right cable, the right length of cable and the right ends on the cable you simply won't get the best read rate that you could nor the fastest read rate.
Cable type is very important to the overall performance of the RFID implementation. If the cable is not a low loss cable and is not shielded properly, then you will get interference and lower read rates than is possible with the proper cable.
To extract the best possible read rate you need to use the lowest line loss cable with low loss connectors and have the total cable length equal to a whole number of wavelengths of the frequency that you are operating on.
If you don't use high quality ends for both the reader and the antenna connection, you will introduce noise and potential line loss into the read rate.
The mathematical calculation used to calculate a wavelength is:
Wavelength = 299792458 divided by the Frequency or;
Frequency = 299792458 divided by the Wavelength
SkyRFID supplies high quality LRM cabling in LMR 240, LMR 400 or LMR 600 UV resistant polyethylene jacketed cables or LMR -DB which is watertight from Altelicon, Amphenol or Times Microwave at very competitive prices.
All LMR cable is very flexible, low loss with higher RFI shielding usually 50 dB greater than typical single shielded coax. The higher the LMR number the thicker the cable will be but the attenutation is much lower.
When you compare the cable characteristics such as attenuation - how much signal loss there is is a length of cable and power consumption in the same length - the LMR series of cables provides much lower losses.
Altelicon LMR 240 - attenuation 24.8 dB per 100 meters (7.6 dB/100 ft) at 900 MHz. and 42.4 dB per 100 m attenuation at 2.5 GHz.
Altelicon LMR 400 - attenuation 12.8 dB per 100 meters (3.9 dB/100 ft) at 900 MHz. and 22.2 dB per 100 m attenutation at 2.5 GHz.
Lower attenuation gives you a longer distance and higher read rates.
The proper quality ends are just as important to the overall read rate. Depending on which type of cable you need the higher the LMR number the thicker the cable and the larger the connector. Conectors are supplied as straight connector or 90° dependant on installation requirements.
Some actual Wavelength calculations are:
125 kHz. wavelength is 2,400 meters or 7860 feet
13.56 MHz. wavelength is 22 meters or 73 feet
433 MHz wavelength is 0.6924 meters or 2.27165 feet or 2 feet and 3.25 inches
900 MHz. wavelength is 0.3323 meters or 1.1 foot or 12.96 inches
915 MHz. wavelength is 12.78 inches - notice between 900 MHz. and 915 MHz. there is a measurable difference that becomes more noticable the longer the cable length is. Whole wavelength cable lengths provide the best signal strength.