一种可保留入射波相位的电磁波滤波器
By designing an electromagnetic wave filter that includes a metal subwavelength resonant cavity and a dielectric layer, the problem of low transmission efficiency of traditional filters at large incident angles is solved, achieving full transmission and phase preservation of fully polarized electromagnetic waves, making it suitable for electromagnetic compatibility and electromagnetic interference suppression.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG UNIV OF TECH
- Filing Date
- 2025-10-16
- Publication Date
- 2026-07-17
AI Technical Summary
Traditional electromagnetic wave filters operate stably under conditions of perpendicular electromagnetic wave incidence, but as the incident angle increases, the transmission efficiency drops sharply, making it impossible to achieve effective filtering of fully polarized electromagnetic waves, and also unable to preserve the incident wave phase or change the thickness.
Design an electromagnetic wave filter including a subwavelength unit. The subwavelength unit consists of a first metal subwavelength resonant cavity, a first dielectric layer, and a first metal subwavelength resonator. By adjusting its equivalent relative permittivity and permeability, full transmission of fully polarized electromagnetic waves can be achieved when incident at 0°~80°, while preserving the phase of the incident wave.
It achieves complete transmission of fully polarized electromagnetic waves at incidence from 0° to 80°, preserves the phase of the incident wave, and the filter thickness can be adjusted as needed without changing its performance. It is suitable for fields such as electromagnetic compatibility and electromagnetic interference suppression.
Smart Images
Figure CN224520171U_ABST
Abstract
Claims
1. An electromagnetic wave filter capable of preserving the phase of an incident wave, characterized by, It includes at least one subwavelength unit, which is in the shape of a cuboid. Each subwavelength unit includes, from the outside to the inside, a first metal subwavelength resonant cavity, a first dielectric layer, and a first metal subwavelength resonator. The first metal subwavelength resonator is located at the center of the first metal subwavelength resonant cavity, and the first dielectric layer is filled between the first metal subwavelength resonator and the first metal subwavelength resonant cavity.
2. The electromagnetic wave filter capable of preserving the phase of the incident wave according to claim 1, wherein, The equivalent relative permittivity of the electromagnetic wave filter that can preserve the phase of the incident wave. With equivalent relative permeability The expressions are as follows: , ,in, p , g Represents complex values; permeability along the x-axis and y-axis. and dielectric constant satisfy , ,in The wave vector in vacuum. Let be the side length of the outer wall of the first metal subwavelength resonant cavity. Let be the metal wall thickness of the first metal subwavelength resonant cavity. Let be the inner wall side length of the first metallic subwavelength resonant cavity. Let be the component of the wave vector in the z-axis direction of the Fabry-Perot resonator material.
3. The electromagnetic wave filter capable of preserving the phase of the incident wave according to claim 2, wherein, The electromagnetic wave filter is longer in the z-axis direction. satisfy At this time, fully polarized electromagnetic waves are fully transmitted and not reflected when incident on the surface of the electromagnetic wave filter at angles of 0° to 80°.
4. The electromagnetic wave filter capable of preserving the phase of the incident wave according to claim 3, wherein, The electromagnetic wave filter is long in the z-axis direction The length is an arbitrary integer multiple of the wavelength, and the z-axis direction is aligned with the central axis of the metal cylinder in the first metal subwavelength resonator.
5. The electromagnetic wave filter capable of preserving the phase of the incident wave according to claim 4, wherein, The electromagnetic wave filter that can preserve the phase of the incident wave is composed of multiple subwavelength units arranged in a close array along the x-axis and y-axis, and the electromagnetic wave filter has a single-layer structure in the z-axis direction.
6. The electromagnetic wave filter capable of preserving the phase of the incident wave according to claim 1, wherein, The first metal subwavelength resonant cavity includes four metal plates that are tightly connected. The interior of the first metal subwavelength resonant cavity is a hollow structure, and a first metal subwavelength resonator and a first dielectric layer are disposed inside. The four metal plates have the same shape and are all rectangular.
7. The electromagnetic wave filter capable of preserving the phase of the incident wave according to claim 1, wherein, The first metal subwavelength resonant cavity and the first metal subwavelength resonator are made of copper.
8. The electromagnetic wave filter capable of preserving the phase of the incident wave according to claim 1, wherein, The first dielectric layer is filled with an alumina material with a dielectric constant of 10.
5.
9. The electromagnetic wave filter capable of preserving the phase of the incident wave according to claim 8, wherein, The first metal subwavelength resonator includes: a first metal sheet, a metal pillar, and a second metal sheet, wherein the first metal sheet is connected to a first end of the metal pillar, and the second end of the metal pillar is connected to the second metal sheet.
10. The electromagnetic wave filter capable of preserving the phase of the incident wave according to claim 1, wherein, According to the appropriate adjustment of the size of the metal sheet and the metal column according to the working wavelength, the equivalent relative dielectric constant and magnetic permeability of the electromagnetic wave filter at the set working frequency meet , form.