A passive wireless sensor with reflective nonlinear transmission lines for capacitive signal transduction

Author

Yu, Fan ; Ma, Yunfei ; Kan, Edwin C.

Author_Institution

Sch. of Electr. & Comput. Eng., Cornell Univ., Ithaca, NY, USA

fYear

2012

Firstpage

103

Lastpage

106

Abstract

A passive RFID transponder with reflective nonlinear transmission lines (NLTLs) has been developed for capacitive sensor detection. By detecting the phase change in the harmonic signal generated by NLTLs, the capacitive sensor information can be monitored wirelessly. To show the feasibility and design procedure, two open-ended NLTLs with terminating capacitive sensors are implemented in IBM 0.13μm CMOS process. The NLTLs with Bragg cutoff frequency f_B = 10 GHz and 15 GHz achieve an average of 0.25°/fF and 0.61°/fF in the phase of the reflected harmonic signal, when the modeled sensor capacitance changes from 290 fF to 900 fF and from 117 fF to 362 fF, respectively.

Keywords

CMOS integrated circuits; radiofrequency identification; telecommunication transmission lines; transponders; wireless sensor networks; Bragg cutoff frequency; CMOS process; NLTL; capacitive sensor information; capacitive signal transduction; passive RFID transponder; passive wireless sensor; reflected harmonic signal; reflective nonlinear transmission lines; Capacitance; Frequency modulation; Harmonic analysis; Power system harmonics; Power transmission lines; Radiofrequency identification; Varactors; RFID tag; capacitive sensors; nonlinear transmission line; phase variance;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio and Wireless Symposium (RWS), 2012 IEEE

Conference_Location

Santa Clara, CA

ISSN

2164-2958

Print_ISBN

978-1-4577-1153-4

Type

conf

DOI

10.1109/RWS.2012.6175331

Filename

6175331