A Frequency Selective Surface Type Curved Medium and Cassegrain Antenna System

Abstract

The invention discloses a frequency selection surface type curved surface dielectric and a cassegrain antenna system. The curved surface dielectric comprises a dielectric substrate; the upper surfaceof the dielectric substrate is a pot cover-shaped curved surface, while the lower surface adopts a shape which is cut towards the upper surface of the dielectric substrate on the basis of the same shape of the upper surface, so that the perpendicular distance from the upper surface to the lower surface of the dielectric substrate is gradually reduced from the outer edge to the center of the dielectric substrate; the upper surface of the dielectric substrate is attached with a metal layer of the set thickness; total reflection of energy at the required waveband is realized in the middle regionof the pot cover-shaped metal layer; and gap units of the same sizes are arranged on the metal layer of a peripheral region in an annular array form, so that transmission of the energy at the requiredwaveband is realized. The curved surface dielectric has the advantages as follows: by adjusting the thicknesses from the outer edge to the center of the dielectric substrate, changes of the dimensions of the gaps in the metal layer from the outer edge to the center is not needed even if the projection angle is changed, thereby greatly lowering the processing difficulty.

Description

technical field [0001] The invention relates to the technical field of antenna reflection surfaces, in particular to a frequency-selective surface-type curved surface medium and a Cassegrain antenna system. Background technique [0002] With the advancement of domestic millimeter-wave technology, millimeter-wave cloud radar technology has also developed rapidly. Due to their inherent defects, single-band cloud radars can no longer meet the needs of the current system. The development of dual-band or multi-band Cloud radar is imperative. Early dual-wavelength detection used dual radars, that is, two radars with different bands were turned on at the same time to detect the same target. The biggest problem with this method is that it is difficult to ensure that the two radars detect the same target, and the amount of equipment is large, and the operation and maintenance requirements are high. Common-aperture antenna radar is an effective method to solve the above problems. C...

AI Technical Summary

Problems solved by technology

The FSS of the curved surface structure does not show strict periodic characteristics similar to the FSS of the infinite planar structure. Therefore, when the electromagnetic wave is incident, it will produce characteristics such as frequency drift and polarization instability, which makes the analysis of the problem relatively complicated.

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