The Use of Free Space Measurement Method to Identify Dielectric Constant of Rice Husks
Keywords:Free Space Measurement Method, Rice Husk, Chamber, Dielectric Constant.
An absorber works by reducing wave reflection. Used as an anechoic chamber, an absorber has a very important role. A good absorber material is able to attenuate wave reflection that can affect the performance of a tool being tested. Absorber that is used and mass produced is an absorber made of polyurethane. The alternative material for making an absorber is rice husks. To determine the ability of rice husk as a microwave absorber, a simulation using CST software is needed. Problem arises since the dielectric constant value of the rice husk is unknown. Therefore, it is necessary to test the rice husk absorber board to determine the dielctric constant value. The method used to determine the dielectric constant is free space measurement. The free space measurement method can be explained as: two horn antennas which serve as transmitter and receiver positioned at a certain distance. Both are connected with the Vector Network Analyzer. Rice husk board is placed between the two antennas. The measurement is aimed at gaining reflection loss value and transmission coeficient value. The value is then used to determine the dielectric constant. The result of the test indicate that the constant value is between 3.5 to 3.7
 M. Ahiduzzaman and A. K. M. S. Islam, â€œEnvironmental impact of rice husk briquette fuel use in Bangladesh: A case study of Mymensingh,â€ in 2009 1st International Conference on the Developements in Renewable Energy Technology (ICDRET), 2009, pp. 1â€“4.
 M. M. Habeeb, G. A. & Fayyadh, â€œRice Husk Ash Concrete : The effect of RHA average particle size on mechanical properties and drying shrinkage,â€ Aust. J. Basic Appl. Sci., vol. 3, no. 3, pp. 1616â€“1622, 2009.
 H. Nornikman, F. Malek, P. J. Soh, A. A. H. Azremi, F. H. Wee, and A. Hasnain, â€œPARAMETRIC STUDY OF PYRAMIDAL MICROWAVE ABSORBER USING RICE HUSK,â€ Prog. Electromagn. Res., vol. 104, pp. 145â€“166, 2010.
 B. K. Chung and H. T. Chuah, â€œDesign and construction of a multipurpose wideband anechoic chamber,â€ IEEE Antennas Propag. Mag., vol. 45, no. 6, pp. 41â€“47, Dec. 2003.
 A. A. Yusof, â€œThe development of microwave absorber from oil palm shell carbon,â€ Universiti Teknologi Malaysia, 2004.
 P. S. Neelakanta and J. C. Park, â€œMicrowave Absorption by Conductor-Loaded Dielectrics,â€ IEEE Trans. Microw. Theory Tech., vol. 43, no. 6, pp. 1381â€“1383, 1995.
 M. B. Rahmat and A. Z. Arfianto, â€œTest of Microwave Absorber of Rice Husk and,â€ 2017 Int. Conf. Adv. Mechatronics, Intell. Manuf. Ind. Autom., pp. 331â€“333, 2017.
 O. V. Tereshchenko, F. J. K. Buesink, and F. B. J. Leferink, â€œAn overview of the techniques for measuring the dielectric properties of materials,â€ in 2011 XXXth URSI General Assembly and Scientific Symposium, 2011, pp. 1â€“4.
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