Abstract
In this paper, an all metal focusing transmitarray antenna using a II-shaped slot element is proposed. The transmitarray is formed by stacking four identical metal phase shift layers and three identical square waveguide layers on each other. To meet the requirements of high-temperature plasma transmission diagnosis, a 2024 aluminum alloy material is used. The simulated results indicate that, unlike the feed antenna, the proposed antenna can concentrate most of the electric field energy into a small area. To verify the design, a fabricated prototype was processed and measured in the C-band. The results show that the proposed antenna achieves an average focal spot diameter of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$1.3~\lambda _{0}$ </tex-math></inline-formula> at 5.7 GHz and it can work in the 5.4-6.0 GHz band. Furthermore, all metal focusing transmitarray antennas have great potential for high-temperature plasma diagnosis.
Highlights
The transmission and reflection characteristics of electromagnetic waves in plasma have attracted much attention [1], and plasma diagnosis is the basis of plasma physics experimental research [2]
An all-metal focusing transmitarray antenna is presented for high-temperature plasma diagnosis
To meet the requirements of high-temperature plasma diagnosis, a 2024 aluminum alloy material is used in the design of the entire transmitarray
Summary
The transmission and reflection characteristics of electromagnetic waves in plasma have attracted much attention [1], and plasma diagnosis is the basis of plasma physics experimental research [2]. Compared with the typical focusing antenna, the transmitarray antenna based on frequency selective surface (FSS) structures can change the propagation direction of the electromagnetic wave more flexibly while having a smaller size, which makes it possible to design a focusing antenna using FSS structures. The goal of this paper is quite hard to achieve(smaller F/D and low cross polarized level), and all metal transmitarray used for focusing antenna has never been reported before. An all-metal focusing transmitarray antenna is presented for high-temperature plasma diagnosis. The simulated and measured results show that the proposed antenna has excellent electromagnetic wave convergence
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