Hydrogel-based integrated antenna-pH sensor

Jeong Il Kim, Zhenwen Ding, Sang No Lee, Jong Gwan Yook, Babak Ziaie, Dimitrios Peroulis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


In this paper, a miniaturized integrated antenna-sensor based on a pH-sensitive hydrogel is designed, fabricated and characterized. The proposed sensor geometry is based on a 5-mm-long slot antenna whose frequency is controlled by a back-metal coated on the pH-sensitive hydrogel that is patterned on a glass substrate. When the antenna is immersed in a solution whose pH changes from 5 to 12 it shows a variation of its resonant frequency by approximately 160MHz around a center frequency of 21.7GHz. Except for an abnormal behavior around the pH=1 state caused by the back-metal-hydrogel bond, the pH-antenna frequency mapping exhibits a well-defined monotonie region from pH=5 to 12 thus covering many practical solutions.

Original languageEnglish
Title of host publicationThe 6th IEEE Conference on SENSORS, IEEE SENSORS 2007
Number of pages4
Publication statusPublished - 2007
Event6th IEEE Conference on SENSORS, IEEE SENSORS 2007 - Atlanta, GA, United States
Duration: 2007 Oct 282007 Oct 31

Publication series

NameProceedings of IEEE Sensors


Other6th IEEE Conference on SENSORS, IEEE SENSORS 2007
Country/TerritoryUnited States
CityAtlanta, GA

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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