C7.1 - Performance and Technology Variants of RFID Sensor Transponders High Frequency or Ultra High Frequency

SENSOR+TEST Conferences 2011
2011-06-07 - 2011-06-09
Proceedings SENSOR 2011
C7 - Sensor Electronic II
R. Jurisch, P. Peitsch, M. Schreyer - microsensys GmbH, Erfurt (Germany)
483 - 483


Radio Frequency Identification (RFID) is a very smart wireless Auto-Identification-Technology. Normally RFID is used for purposes of contactless identification and individual data storage in the RFID transponder. This article will describe an extended usage of the RFID technology not only for data storage – it could be interesting to integrate sensors in a passive RFID transponder itself for many applications. So it should be possible to read out measured sensor values wireless without any contacts and without any internal battery. In this paper will discuss exclusive passive sensor RFID devices and no standard radio communication.
The demands of such RFID sensors are affected by the customer applications. Very important are communications distance, data rate of communication and the size of the transponder device. To achieve such specified parameters are necessary to design special features of RFID front end, control unit and sensor device including its electronic converting.
This paper shows the relation between different technologies, application parameters and design features. One specific feature for sensors is the need of a very low power consumption of itself. Also the supply voltage for the sensor has to be very small. Import is also that the sensor has a data interface which allows the electrically connecting to a transponder RFID front end. Today are existing different sensors for temperature, pressure, humidity and other physical sizes which can fulfill these inquiries. There are various systems like LF (low frequency), HF (high frequency), UHF (ultra high frequency) or micro waves with different characteristics in operation mode, reading distance, data communication rate, antenna design and functionality in various surroundings like water or metal. At the end will get an overview of the important parameters, features and technologies in matrix form.