RFID im Blick

SAW enables identification, condition measurement, and localisation without a power supply or chip

Articles | By PR RFID & Wireless IoT Global | 12 June 2017
A SAW tag is based on a piezoelectric substrate on top of which there is a converter which act as a transmitter/receiver as well as several reflective elements. A SAW tag is based on a piezoelectric substrate on top of which there is a converter which act as a transmitter/receiver as well as several reflective elements.

From blast furnaces to deep space

Specialised high temperature applications for industry, upcoming applications in healthcare, possible use cases in aeronautics – those are the options for transponders and sensors with “Surface Acoustic Wave” technology (SAW). SAW enables the identification of objects while simultaneously measuring physical properties such as temperature, pressure, or weight – up to layered measurement of cell structures and blood samples, the applications of which are already apparent today in bio-sensor technology.

By “RFID & Wireless IoT Global”

Piezoelectric effect

SAW transponders and sensors are based on the piezoelectric effect: the interdependency between physical deformation and electric voltage. Discovered by Jacques and Pierre Curie in 1880, the effect means that the deformation of an object creates electric voltage just as the application of voltage to an object deforms said object. Thus, the piezoelectric effect allows the transformation of electric signals into acoustic signals and vice versa, which is why it is deployed in microphones and loudspeakers.

Moreover, the SAW effect enables the construction of bandpass filters for low frequency ranges. Numerous mobile devices such as mobile phones and tablets contain ten or more different SAW filters, including broadband and narrow band filters, low-pass and high-pass, pre-filtering and more. This enables the processing of different signals – from mobile phone and LTE signals to WiFi and Bluetooth – in one device.

Der SAW-Effekt ermöglicht zudem die Konstruktion von Bandpassfiltern für niedrige Frequenzbereiche. Zahlreiche Mobilgeräte wie Telefone und Tablets enthalten zehn oder mehr verschiedene SAW-Filter, einschließlich Breitband- und Schmalbandfiltern, Niedrigpass und Hochpass, Vorfiltern und mehr. Diese ermöglichen die Verarbeitung verschiedener Signale, von Telefon- und LTE-Signalen bis hin zu WLAN und Bluetooth, in einem Gerät.

Utilisation as RFID tags

SAW tags are often listed as a subtype of RFID tags in specialist literature. A SAW tag is based on a piezoelectric substrate on top of which there is a converter which act as a transmitter/receiver as well as several reflective elements. The signal hits the receiver, is converted into a ...

Read the full article published in the April 2017 issue of the leading trade journal "RFID & Wireless IoT Global". Download your personal digital copy of the magazine now and gain exclusive insight into more use cases and the potential of RFID & Wireless IoT technologies for process optimisation in different industries.

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Last modified on Saturday, 03 March 2018 11:39
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