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Microstrip ring resonator for soil moisture measurements

机译：微带环形谐振器，用于土壤湿度测量

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Development of a successful remote sensing instrument for soil moisture relies on the accurate knowledge of the soil dielectric constant (/spl epsiv//sub soil/) to its moisture content. Two existing methods for measurement of dielectric constant of soil at low and high frequencies are, respectively, the time domain reflectometry and the reflection coefficient measurement using an open-ended coaxial probe. The major shortcoming of these methods is the lack of accurate determination of the imaginary part of E/sub soil/. In this paper, a microstrip ring resonator is proposed for the accurate measurement of soil dielectric constant. In this technique the microstrip ring resonator is placed in contact with soil medium and the real and imaginary parts of E/sub soil/ are determined from the changes in the resonant frequency and the quality factor of the resonator, respectively. The solution of the electromagnetic problem is obtained using a hybrid approach based on the method of moments solution of the quasistatic formulation in conjunction with experimental data obtained from reference dielectric samples. Also, a simple inversion algorithm for E/sub soil/=E/sup '//sub r/-j/spl epsiv/E/sup "//sub r/ based on regression analysis is obtained. It is shown that the wide dynamic range of the measured quantities provides excellent accuracy in the dielectric constant measurement. A prototype microstrip ring resonator at L-band is designed and measurements of soil with different moisture contents are presented and compared with other approaches.
机译：成功的土壤水分遥感仪器的开发依赖于土壤水分的介电常数（/ spl epsiv // sub soil /）的准确知识。现有两种测量土壤低频和高频介电常数的方法分别是时域反射法和使用开放式同轴探针的反射系数测量。这些方法的主要缺点是缺乏对E / sub土壤/虚部的准确测定。本文提出了一种微带环谐振器，用于精确测量土壤介电常数。在该技术中，微带环谐振器被放置成与土壤介质接触，并且E / sub土壤/的实部和虚部分别根据谐振器的谐振频率和品质因数的变化来确定。电磁问题的解决方案是使用基于准静态公式的矩量解法的混合方法结合从参考电介质样本获得的实验数据来获得的。此外，基于回归分析，获得了一种简单的E / sub土壤/ = E / sup'// sub r / -j / spl epsiv / E / sup“ // sub r /的反演算法。动态量测范围提供了优异的介电常数测量精度，设计了一个原型的L波段微带环形谐振器，提出了不同含水量土壤的测量方法，并与其他方法进行了比较。

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