In this paper, the design methodology of a microstrip angular displacement sensor based on an impedance transformer with a quasi-Chebyshev frequency response is proposed. This sensor with impedance transforming function can realize the angular displacement detection by bandwidth sensing, and matching sensing simultaneously. The insertion loss in stopband achieves 24.9 dB to 32.6 dB with an average bandwidth selectivity of 2.25 MHz/degree of the sensor centered at 2.4 GHz with two poles of 1.71 GHz and 2.81 GHz. Meanwhile, the average matching level of return loss for displacement sensitivity are 0.18 dB/degree and 0.15 dB/degree, respectively. It is the first time to apply an impedance transformer into the angular displacement sensor design for both bandwidth and matching level sensing among reviewed literatures. In this design, the load-to-source impedance transformation is designed for 250-to- $50~\Omega $ , and by adding a rotated stub on the proposed microstrip transformer, the sensing function is developed with angular displacement.

中文翻译：

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基于准切比雪夫频率响应微带宽带阻抗变压器的角位移传感器

在本文中，提出了一种基于具有准切比雪夫频率响应的阻抗变换器的微带角位移传感器的设计方法。这种具有阻抗变换功能的传感器可以同时实现带宽传感和匹配传感的角位移检测。阻带中的插入损耗达到 24.9 dB 至 32.6 dB，传感器的平均带宽选择性为 2.25 MHz/度，以 2.4 GHz 为中心，两个极点为 1.71 GHz 和 2.81 GHz。同时，位移灵敏度回波损耗的平均匹配水平分别为0.18 dB/度和0.15 dB/度。在回顾的文献中，这是第一次将阻抗变换器应用于角位移传感器的设计，以实现带宽和匹配水平传感。在这个设计中，