In this paper, a novel SIW microwave sensor is designed to accurately determine the broadband complex permittivity of medium loss and dispersive liquids using a number of higher order modes in 11–20 GHz. To achieve a higher accuracy in characterization, the sensor is equipped with some methods such as Photonic Band Gap method, slow-wave via, and a new feedline, which enhances the quality factor for the higher order TE1,0,n modes. The operating principle of this sensor is based on the cavity perturbation technique, in which the resonant properties of the cavity are utilized to extract the dielectric properties of liquid under test. To provide a method to decrease the LUT consumption, a winding microfluidic channel is designed and embedded in the cavity. The channel increases the interaction between the induced electric field and the LUT. The accuracy of different perturbation technique for determination of permittivity is compared with each other.

中文翻译：

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在宽带 SIW 传感器中采用高阶模式来测量介质损耗材料的介电常数

在本文中，设计了一种新型 SIW 微波传感器，用于使用 11-20 GHz 的多个高阶模式准确确定介质损耗和色散液体的宽带复介电常数。为了获得更高的表征精度，传感器配备了一些方法，例如光子带隙方法，慢波通孔和新的馈线，从而提高了更高阶的品质因数TE1,0,n模式。该传感器的工作原理是基于腔体微扰技术，其中利用腔体的谐振特性来提取被测液体的介电特性。为了提供一种减少LUT消耗的方法，设计了一个弯曲的微流体通道并将其嵌入腔体中。该通道增加了感应电场和LUT之间的相互作用。比较了不同微扰技术确定介电常数的精度。