Measuring and modelling the complex-permittivity of hemp plant (Cannabis Sativa) at X band for microwave remote sensing

Abstract

It is vital to determine the dielectric characterization of hemp plant (Cannabis Sativa) for microwave remote sensing to increase its accuracy and to improve algorithms for satellite data interpretation. For that, this study provides the measurement results of complex permittivity of hemp stems and leaves in terms of various moisture contents (MC) in 8–12.4 GHz in a laboratory with a temperature of 25°C and a relative humidity of 59%. With the measurement data, the dielectric properties are modelled as a second-order polynomial function based on a curve-fitting method depending on the frequency and MC. For hemp stems and leaves with various MC, while the real part of the relative complex permittivity (${\epsilon }^{\prime }$) ranges between 2.1–7.2 and 1.5–6.1, the imaginary part of that (${\epsilon }^{″}$) varies in 0.3–4.5 and 0.2–4.2, respectively. The measured and modelled results are compatible with each other.

KEYWORDS:

• Hemp
• complex-permittivity
• dielectric measurement
• microwave remote sensing

Acknowledgements

The authors would like to thank Prof. Dr. Semsettin Altindal for his valuable supports.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Abdullah Genc

Abdullah Genc received his B.Sc. degree in Electrical and Electronics Engineering from Istanbul University in 2008, M.Sc. degree in Mechanical Engineering from Rice University, in Houston, USA, in 2011, and Ph.D. degree in Electronics and Communication Engineering from Süleyman Demirel University in Isparta, in 2017. He has been working as an Asst. Prof. in the Department of Mechatronic Engineering in Isparta University of Applied Sciences. His fields of interest include antennas and propagation, electromagnetic fields and waves, and microwave circuit design.

I. Bahadir Basyigit

I. Bahadir Basyigit received his B.Sc. degree in Electrical and Electronics Engineering from the Sakarya University in 2005, M.Sc. degree in Electrical and Electronics Engineering from the Akdeniz University, in Antalya, in 2011, and Ph.D. degree in Electronics and Communication Engineering from Süleyman Demirel University in Isparta, in 2016. He has worked in various mobile operators and vendors as a planning and optimization engineer for 3 years. He has been working as an Asst. Prof. in Department of Electrical and Electronics Engineering in Isparta University of Applied Sciences. His current research interests are among Electromagnetic compatibility, electromagnetic waves, electromagnetic propagation, and cellular networks.

Habib Dogan

Habib Dogan received his B.Sc. and M.Sc. degrees in Electronics Engineering from the Erciyes University in Kayseri in 1994 and 2001, respectively, and Ph.D. degree in Electronics and Communication Engineering from Süleyman Demirel University in Isparta, in 2018. He has worked as an instructor at Harran University between 1995 and 2011. He has been working as an Electronics Engineer in the Ministry of Environment and Urbanization in Isparta. His current research interests are among Electromagnetic compatibility, electromagnetic waves, electromagnetic propagation, and RFID applications.

Bektas Colak

Bektas Colak earned Ph.D. degree in 2002. He has been worked at the Turkish National Research Center (TUBITAK) as a senior researcher during the period of 1994–2002. He had started to give Ph.D. lecturers at Gebze High Technology Institute in 2002 on EMC field. He has established his own company EMC Ltd and worked on EMC Filtering. Then he has involved in Karabuk University in 2011 and worked at TUBITAK UME as a consultant in EMC Laboratory. He has been at Syracuse University as a visiting scholar. He has been working as an Asst. Prof. in the Department of Electrical and Electronics Engineering in Alanya Alaaddin Keykubat University. His main interests are in EMC measurements and RF material analyzes techniques.