A 2.4 GHz to 27 MHz non-Linear RFID Topology in Flexible Electronics
A 2.4 GHz to 27 MHz non-Linear RFID Topology in Flexible Electronics
- Author(s): G. Gentile and R. Ishihara
- DOI: 10.1049/cp.2017.0246
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- Author(s): G. Gentile and R. Ishihara Source: Loughborough Antennas & Propagation Conference (LAPC 2017), 2017 page (5 pp.)
- Conference: Loughborough Antennas & Propagation Conference (LAPC 2017)
- DOI: 10.1049/cp.2017.0246
- ISBN: 978-1-78561-699-0
- Location: Loughborough, UK
- Conference date: 13-14 Nov. 2017
- Format: PDF
A non-linear commercial topology of passive RFID tag is transported onto a low-cost flexible substrate by means of antenna embedded distributed decoupling capacitors, which allow to embed both a far-field antenna, operating at 2.4 GHz, and a near-field antenna, operating at 27 MHz, into a compact low-cost layout. The sensor is based on two co-designed planar antennas and a demodulating diode, which receives a two-tone gigahertz signal and radiates back their frequency difference. Filtering elements are embedded directly into the antennas to decouple the near-field and far-field section. The layout transport is realized using silver ink printing on a flexible plastic substrate and can be used for instance as soil moisture sensor when a simple planar capacitance is added to the design. Two-tone measurements of the sensor show the amplitude of the 2nd order intermodulation product at 27 MHz to be only 9 dB lower than the 3rd intermodulation product at 2.400 GHz - 27 MHz, thanks to the high non-linearity of the sensor and the decoupling effect of the distributed capacitors in the metal traces of the folded-slot antenna topology.
Inspec keywords: flexible electronics; planar antennas; radiofrequency identification; capacitors; slot antennas; HF antennas; ink jet printing; diodes; intermodulation measurement; UHF antennas
Subjects: Modulation and coding methods; RFID systems; Capacitors; Single antennas
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