This paper presents a novel design of rigid coaxial line based variable stub tuner. It incorporates controlled drive for the movement of shorting ring along the length of the stub inside the coaxial line. The ring is housed inside stub through linear slot over the coaxial conductor. Inbuilt slot at outer conductor of coaxial line introduces undesirable discontinuity which deteriorates the performance of the stub. It needs to be compensated to get the desirable performance of tuner. The effect of discontinuity has been analyzed using circuit modelling and compensated in design itself for the desired performance. The compensated tuner has been fabricated and tested where test results are found as return loss better than 25 dB and Voltage Standing Wave Ratio (VSWR) in between 1.1 and 1.9 in the frequency range of 80–850 MHz. The presented work is useful for the development of high power stub tuner in the range of High Frequency (HF), Very High Frequency (VHF) and Ultra High Frequency (UHF) which is an interest of wide spread applications in areas of communication, defence, satellite, radar, tokamak etc.

中文翻译：

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基于刚性同轴线的可变短截线调谐器的设计与开发

本文提出了一种基于刚性同轴线的可变短截线调谐器的新颖设计。它集成了可控制的驱动器，以使短路环沿着短截线的长度在同轴线内移动。该环通过同轴导体上的线性槽容纳在短管内部。同轴线外导体上的内置槽会引入不良的不连续性，从而使短截线的性能恶化。需要补偿它以获得调谐器的理想性能。已经使用电路建模分析了不连续性的影响，并在设计中针对所需的性能对其进行了补偿。补偿调谐器已经过制造和测试，在80-850 MHz频率范围内，测试结果发现回波损耗优于25 dB，电压驻波比（VSWR）在1.1至1.9之间。