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Free Online OCR service allows you to convert PDF document to MS Word file, scanned images to editable text formats and extract text from JPEG/TIFF/BMP ... Convert PDF to Word via Email · Free Online OCR - FAQ · Account/login · Contact us this, the electromagnetic field may be treated as a simple magnetic alternating field with regard to the distance between tag and antenna Since the operating wavelength is very much greater than the distance between the tag and interrogator, the coupling elements are not really antennas in the true sense, because no real power is being radiated Power transfer to and from the tag is by coupling of reactive near-field energy in the immediate vicinity of the antenna structure The interrogator antenna, typically a coil, generates a strong, high-frequency electromagnetic field A small part of this field penetrates the tag antenna, also typically a coil that is a small distance away from the interrogator antenna By induction, a voltage is generated in the tag antenna, just as in ordinary transformers This voltage is rectified and provides power supply for the integrated circuit (IC) on the tag A capacitor is connected in parallel with the interrogator antenna Its capacitance is selected such that it combines with the inductance of the antenna to form a parallel resonant circuit with a resonant frequency that corresponds to the transmission frequency of the interrogator Very high currents are generated in the interrogator antenna by resonance step-up in the parallel resonant circuit, which can be used to generate the required field strengths for the operation of the remote tag This shows that the inductively coupled systems are based upon a transformer-type coupling between the primary coil in the interrogator and the secondary coil in the tag The optimum number of turns needed in an antenna coil is inversely proportional to operating frequency As the frequency of operation increases, the number of turns required reduces The interrogator communicates with the tag by modulating a carrier wave by varying the amplitude, phase, or frequency of the carrier This modulation can be directly detected as current changes in the coil of the tag The tag communicates with the interrogator by varying how much it loads its antenna This in turn affects the voltage across the interrogator s antenna By switching the load on and off rapidly, the tag can create sideband frequencies, which are then coupled into the interrogator antenna For an RFID system operating at 1356 MHz, the approximate distance at which the near-field zone ends is /2 , or 35 meters Beyond this distance, the magnetic field is reduced so low that tags cannot be powered Due to this, the typical read range for 1356 MHz tags is less than 1 meter The read distance depends on the size of the interrogator antenna Typical handheld interrogators can read an electronic identity from about 2 inches An interrogator with a large antenna can read a tag up to 2 feet away Inductively coupled systems are not affected by water or human tissue but are sensitive to metal (conducting material) in the operating zone Also, as the magnetic field has vector characteristics, the tag orientation influences performance of the system Since inductive RFID. mac pdf to word converter online: Online OCR Software: Convert scanned PDFs and Images! convert pdf to word mac free online The best free PDF to Word converter 2019 | TechRadar
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