A compact large-angle scanning leaky-wave antenna based on alumina ceramic material

Abstract

The invention discloses a compact large-angle scanning leaky-wave antenna based on alumina ceramic material, which belongs to the field of antennas. The antenna consists of three parts: a grounded dielectric substrate, a composite left and right-handed microstrip transmission line, and an alumina ceramic block. The composite left and right-handed microstrip transmission line consists of a 50-ohm rectangular microstrip line on the front of the dielectric substrate, periodically arranged rectangular slots, and short-circuit nails to match the branches. composition. Since the introduced rectangular slit can be equivalent to a magnetic dipole, its E-plane far-field pattern is omnidirectional. When the beam points away from the side-beam direction, it can make up for the loss of gain. Therefore, it has a large-angle scanning feature and effectively increases signal coverage. At the same time, the introduced alumina ceramic material has high dielectric constant, high quality factor and low loss characteristics. Compared with the traditional leaky wave antenna, the size of the antenna is greatly reduced, and the radiation efficiency of the antenna can be maintained at a high level.

Description

technical field [0001] The invention belongs to the field of antennas, and relates to a compact large-angle scanning leaky wave antenna based on alumina ceramic materials. Background technique [0002] Leaky-wave antennas belong to the category of traveling-wave antennas, which are characterized by beams that are highly directional and can scan with frequency. In recent years, with the rapid development of wireless communication, the application scenarios of leaky wave antennas have greatly increased, and higher requirements have been put forward for their performance indicators. On the one hand, the design of leaky-wave antennas, like phased array antennas, needs to obtain a larger beam scanning range to meet the requirements of signal space coverage; Froquet's cycle theorem shows that when the traditional periodic leaky-wave antenna works with high-order modes, the unit spacing is not less than an integer multiple of the half wavelength of the operating frequency, so it i...

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Problems solved by technology

On the one hand, designing a leaky wave antenna, like a phased array antenna, needs to obtain a larger beam scanning range to meet the requirements of signal space coverage; on the other hand, it is necessary to achieve a compact antenna structure without affecting the performance of the antenna. Floquet's cycle theorem shows that when the traditional periodic leaky-wave antenna works with high-order modes, its unit spacing is not less than an integer multiple of the half-wavelength of the operating frequency, so the overall size of the antenna is difficult to reduce; while for another type of antenna based on composite Quasi-periodic leaky wave antennas made of left and right hand materials, interdigitated capacitors, and parallel plate capacitor structures can provide limited capacitance per unit length and low radiation efficiency, and it is also difficult to achieve size reduction

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