Transmission line, and leaky-wave antenna multiplexing device and beam scanning method thereof

Abstract

The invention discloses a transmission line, a leaky-wave antenna multiplexing device and a beam scanning method thereof. The device comprises a dielectric substrate, a metal strip and a metal floorboard positioned on the front and back surfaces of the dielectric substrate, and periodically alternatively arranged capacitors and variable capacitance diodes for connecting the metal floorboard and the metal strip via the through holes. The metal strip comprises gradient microstrip line structures at two ends and an artificial surface plasmon structure positioned therebetween. When the capacitance value of the variable capacitance diode is identical with that of the fixed capacitor, the surface impedance of the device is identical, and thus the function of the transmission line is achieved; when the capacitance value of the variable capacitance diode is not identical with that of the fixed capacitor, the surface impedance of the device is periodically modulated, and thus the radiation function of the leaky-wave antenna is achieved. Voltage is used as a regulation means, and fixed frequency beam scanning can be achieved along with the change of the voltage; the device is simple to manufacture, convenient to operate and prone to integrate; only a photoetching step is needed, so that cost is saved, and 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 transmission line and leaky wave antenna multiplexing device 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 pla...

AI Technical Summary

Problems solved by technology

[0005] In the current research results, the multiplexing function of the leaky wave antenna and the transmission line has not been realized, and the problem of pre-calculating the angle theory has not been solved. In addition, the existing technology is complicated to manufacture, inconvenient to operate, not easy to integrate, and the cost is relatively high. Multi-layer structure is easy to cause processing errors

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