Microwave Non-destructive Technique using a Double-ring Resonator for Classification of Transparent Flesh and Yellow gum Mangosteens

¹ Department of Electrical Engineering University of Mataram Mataram, Indonesia
² Department of Agricultural Engineering University of Mataram Mataram, Indonesia

^* cahyo.muvianto@unram.ac.id
^† suthami@unram.ac.id

Abstract

One of the most important agricultural commodities exported from Indonesia is mangosteen. Mangosteens are not always fruits without flaws, in any case. To categorize the quality of mangosteen fruits, farmers employ human eyesight. As a result, this data can be unreliable and erroneous after harvesting. Both internal and exterior flaws are possible. Some spots include improper form, a hardening pericarp, yellow gumming, or transparent flesh. Often, the longest part, the translucent skin, might be difficult to see. Treatment for these disorders must be non-invasive and nondestructive. In this essay, a double-ring microstrip resonator modification is suggested and examined. The mangosteen fruits were measured using the resonator and divided into three groups. Ordinary, transparent flesh and yellow gumming are the classifications. 1.4 GHz is the resonator's operating frequency. By detecting the return loss value and the S21 value at a frequency between 100 MHz and 3 GHz, the sensor ascertains the dielectric value of each mangosteen fruit. At frequencies of 1.15 GHz-1.28 GHz and 1.42 GHz-1.52 GHz, and with dielectric constants between 2.98 and 3.28, there is a variation in permittivity values between the categories of regular, clear, and yellow mangosteen.