摘要
介电常数和损耗是微波介质材料的重要参数。目前介电常数的测量方法比较多,但存在测试仪器昂贵、测量方法严格、样品制备苛刻等问题。在当今电磁商业软件十分强大的时代背景下,利用数值仿真详细研究了矩形波导中介质圆柱的谐振模态随自身介电常数和几何大小的变化规律,进而提出一种在矩形波导中直接放入待测样品,通过寻找样品的特征谐振峰得到介电常数的测量方法。研究结果表明,对于介电常数为2.5~100的介质材料,都可通过制备成直径为10 mm的圆柱样品放在BJ100波导中准确地测出其介电常数和损耗的大小。为证明方法的优越性,以氧化铝、滑石和其他陶瓷样品为例进行了实测,得到与第三方测试一致的结果。本文提出的方法简单、高效、便捷,能够对介质材料的广泛应用起到极大推动作用。
The permittivity and loss are the important parameters of the microwave dielectric materials.At present,there are many measurement methods.However,there are some problems,such as expensive testing instruments,strict measurement methods,complicated sample preparation and so on.In this paper,with powerful electromagnetic software,the variation of resonant mode of the dielectric cylinder sample in rectangular waveguide with its permittivity and size was studied in detail by numerical simulation,and then a method for measuring permittivity was proposed by directly placing the cylinder sample into the rectangular waveguide and searching for the characteristic resonant peak of the sample.The results show that the dielectric materials with permittivity of 2.5-100 can be accurately measured by preparing cylindrical samples with the diameter of 10 mm and placing them into BJ100 waveguide.In order to prove the superiority of the proposed method,the permittivity and loss of Al_(2)O_(3),talc and other ceramic samples were measured,respectively,and the results are completely consistent with those from the third party test.This method is simple,efficient and convenient,which can greatly promote the wide application of dielectric materials.
作者
朱明亮
李勃
郭云胜
ZHU Mingliang;LI Bo;GUO Yunsheng(School of Science,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia Autonomous Region,China;State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China)
出处
《电子元件与材料》
CAS
CSCD
北大核心
2022年第3期238-242,290,共6页
Electronic Components And Materials
基金
国家自然科学基金(51862027,61675103)
内蒙古自然科学基金(2018JQ03)。
关键词
介电常数
损耗
透射系数
波导
电磁谐振
permittivity
loss
transmission coefficient
waveguide
electromagnetic resonance
