A Passive Harmonic Tag for Humidity Sensing
Joint Authors
Lazaro, Antonio
Villarino, Ramon
Girbau, David
Source
International Journal of Antennas and Propagation
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-07-23
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
This paper describes a passive harmonic tag for radio frequency identification (RFID) and wireless sensor applications.
The tag uses a dual polarized UHF patch antenna as an input antenna.
One of the outputs is connected to a frequency doubler, which consists of a Schottky diode with its output connected to a patch tuned at twice the input frequency.
The other output of the input antenna feeds a DC power harvested converter that drives an oscillator which modulates its output signal by controlling the bias point of the Schottky diode.
The antenna’s output is also used as a humidity sensor.
To achieve this, the antenna is loaded with an interdigital capacitor with humidity-dependent capacitance.
The antenna is consequently detuned when humidity varies, and therefore the second harmonic power is received.
The tag is manufactured using standard fiberglass substrate.
The basic theory of harmonic tag operation is described and compared with the standard backscattering approach.
Experimental results with a proof of concept using commercial components are presented.
American Psychological Association (APA)
Lazaro, Antonio& Villarino, Ramon& Girbau, David. 2014. A Passive Harmonic Tag for Humidity Sensing. International Journal of Antennas and Propagation،Vol. 2014, no. 2014, pp.1-11.
https://search.emarefa.net/detail/BIM-1036150
Modern Language Association (MLA)
Lazaro, Antonio…[et al.]. A Passive Harmonic Tag for Humidity Sensing. International Journal of Antennas and Propagation No. 2014 (2014), pp.1-11.
https://search.emarefa.net/detail/BIM-1036150
American Medical Association (AMA)
Lazaro, Antonio& Villarino, Ramon& Girbau, David. A Passive Harmonic Tag for Humidity Sensing. International Journal of Antennas and Propagation. 2014. Vol. 2014, no. 2014, pp.1-11.
https://search.emarefa.net/detail/BIM-1036150
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1036150