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http://dx.doi.org/10.5515/KJKIEES.2018.29.8.571

Dual-Band Patch Antenna for Communication and Moisture Measurement of Coffee Beans  

Sul, Changhwan (Information Communication Engineering, Daegu University)
Chung, Youchung (Information Communication Engineering, Daegu University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.29, no.8, 2018 , pp. 571-575 More about this Journal
Abstract
The moisture content of a coffee bean affects its permittivity, and changing the moisture content of a coffee bean changes the taste of the coffee. The variation in the moisture content of a coffee bean can be predicted by the change in frequency and reflection coefficient values with respect to the variation in the permittivity of the bean when it is placed on a patch antenna. In this study, a dual-band patch antenna is designed, which has a moisture measurement band of 3.8~4 GHz that can measure the moisture level of a material; the antenna has a Wi-Fi transmit and receive band of 2.45 GHz. Through simulations and measurements, this study proved that the level of return losses changed from 3.6 to 4 GHz when the moisture content of a coffee bean changed from 2 to 15%. The moisture levels of rice and other beans can be measured with the designed antenna, which can be applied to various applications.
Keywords
Dual-Band Patch Antenna; Coffee Moisture Measurement; Permittivity Measurement;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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