外文翻譯--頻率范圍(已修改)
2025-06-01 05:39 本頁面
【正文】 中文 2933 字 英文原文 RFID Frequency Ranges Used Because RFID systems generate and radiate electromagic waves, they are legally classified as radio systems. The function of other radio services must under no circumstances be disrupted or impaired by the operation of RFID systems. It is particularly important to ensure that RFID systems do not interfere with nearby radio and television, mobile radio services (police, security services, industry), marine and aeronautical radio services and mobile telephones. The need to exercise care with regard to other radio services significantly restricts the range of suitable operating frequencies available to an RFID system (Figure 11). For this reason, it is usually only possible to use frequency ranges that have been reserved specifically for industrial, scientific or medical applications. These are the frequencies classified worldwide as ISM frequency ranges (Industrial–Scientific–Medical), and they can also be used for RFID applications. In addition to ISM frequencies, the entire frequency range below 135 kHz (in North And South America and Japan:400 kHz) is also suitable, because it is possible to work with high magic field strengths in this range, particularly when operating inductively coupled RFID systems. The most important frequency ranges for RFID systems are therefore 0–135 kHz,and the ISM frequencies around (not yet available in Germany), MHz, MHz, MHz, MHz, MHz, MHz (not in Europe), GHz, GHz and overview of the estimated distribution of RFID transponders at the various frequencies is shown in Figure 12. AVAILABLE amp。 PRACTICAL RFID FREQUENCIES Figure11 The frequency ranges used for RFID systems range. The frequency ranges used for RFID systems range from the myriametric range below 135 kHz, through short wave and ultrashort wave to the microwave range, with the highest frequency being 24 GHz. In the frequency range above 135 kHz the ISM bands available worldwide are preferred. Figure12 The estimated distribution of the global market for transponders over the various frequency ranges in million transponder units (Krebs, .) 1 Frequency range 9–135 kHz The range below 135 kHz is heavily used by other radio services because it has not been reserved as an ISM frequency range. The propagation conditions in this long wave frequency range permit the radio services that occupy this range to reach areas within a radius of over 1000 km continuously at a low technical cost. Typical radio services in this frequency range are aeronautical and marine navigational radio services (LORANC, OMEGA, DECCA), time signal services, and standard frequency services, plus military radio services. Thus, in central Europe the time signal transmitter DCF 77 in Mainflingen can be found at around the frequency kHz. An RFID system operating at this frequency would therefore cause th
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