Fixed frequency beam scanning leaky-wave antenna and beam scanning method thereof

Abstract

The invention discloses a fixed frequency beam scanning leaky-wave antenna and a beam scanning method thereof. The antenna comprises a dielectric substrate, a metal strip and a metal floorboard positioned on front and back surfaces of the dielectric substrate, and a plurality of variable capacitance diode positioned on the front surface of the dielectric substrate, wherein the metal strip comprises a set of arc-shaped gradient microstrip structures and an artificial surface plasmon structure positioned between the gradient microstrip structures; the artificial surface plasmon structure comprises transition sections connected with the gradient microstrip structures and a plurality of groove units with periodically changed groove depth positioned between the transition sections; and the metal strip is connected with the metal floorboard via the variable capacitance diode and through holes. According to the antenna and the beam scanning method thereof provided by the invention, modulation on average surface impedance is achieved by adjusting the capacitance value of the variable capacitance diode, and fixed frequency beam scanning can be achieved along with the change of voltage; in addition, the antenna is simple to manufacture, convenient to operate and prone to integrate; and only a photoetching step is needed, so that cost is saved, machining errors caused by a multi-layer structure are avoided.

Description

technical field [0001] The invention relates to a microwave antenna, in particular to a fixed frequency beam scanning leaky wave antenna and a beam scanning method thereof. Background technique [0002] Surface plasmon is a surface electromagnetic wave mode, which is distributed at the interface between metal and medium, and tightly binds electromagnetic energy in a small area around the interface. It has sub-wavelength characteristics in the optical band and can be effectively transmitted. and localized light waves, which are widely used in optical communication systems. However, metals exhibit ideal electrical conductor properties in the microwave range, and cannot directly support surface plasmons at the interface between metal and dielectric. Therefore, an artificial surface plasmon based on a planar metal slot structure was proposed, whose dispersion characteristics are consistent with surface plasmon, which provides the possibility for designing planar plasmon devices...

AI Technical Summary

Problems solved by technology

[0005] The existing technology does not solve the problem of theoretical calculation of the beam angle in advance. In addition, the existing technology is complicated to manufacture, inconvenient to operate, not easy to integrate, and the cost is relatively high, and the multi-layer structure is easy to cause processing errors

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