Design of point focusing lens antenna for high‐temperature plasma diagnosis

Abstract

AbstractA high temperature point focusing lens antenna was proposed in this article. The lens antenna mainly includes three parts: a point focusing lens, a feed source, and a support frame. The lens is made of high‐temperature resistant quartz material, and the feed and support structure are also made of high‐temperature resistant metal. In addition, the dielectric constant of quartz is ε r = 3.78, which is higher than that of the conventional Teflon material (with a ε r=2.1). Under the lens of the same diameter, the thickness is only 50.5% of that of the Teflon material, and the weight is only 51.5% of the Teflon material. To verify the design, the antenna was processed and measured. According to the test results, the focal resolution of the lens in the range of 26.5 to 40 GHz is less than 24.5 mm. As the frequency increases, the resolution gradually becomes smaller, which is consistent with the theory. This design method provides a very good application example for high‐temperature antennas.