CN102903996A - a resonance cavity - Google Patents

Abstract

The invention relates to a resonant cavity. The resonant cavity comprises a cavity body and a resonator arranged in the cavity body, wherein the resonator is a metamaterial; the metamaterial comprises at least one material sheet layer; each material sheet layer comprises a substrate and at least two artificial microstructures attached to the substrate; and at least two artificial microstructures are connected by leads. The resonant cavity has the following beneficial effects: by putting the metamaterial in the resonant cavity and connecting the at least two artificial microstructures on the substrate, the resonant frequency of the resonant cavity can be reduced, and the quality factor Q of the resonant cavity can be improved, thus being beneficial to achieving the miniaturization of the resonant cavity and improving the properties of the resonant cavity.

Description

a resonance cavity

technical field

The invention relates to the field of wireless communication, more specifically, to a resonant cavity. the

Background technique

The resonant cavity is a resonant element that works at microwave frequencies. It includes a cavity surrounded by conductive walls (or magnetically permeable walls) of any shape, and can form a medium area of electromagnetic oscillation in it. It has the ability to store electromagnetic energy and select certain Characteristics of frequency signals. The resonant frequency of a microwave resonant cavity depends on the volume of the cavity. Generally speaking, the larger the volume of the resonant cavity, the lower the resonant frequency, and the smaller the volume of the resonant cavity, the higher the resonant frequency. Therefore, how to achieve Reducing the resonant frequency of the resonant cavity is of great significance for the miniaturization of the resonant cavity. the

Contents of the invention

The technical problem to be solved by the present invention is to provide a resonant cavity that can reduce the resonant frequency without increasing the size of the resonant cavity. the

The technical solution adopted by the present invention to solve the above technical problems is: a resonant cavity, including a cavity, and a resonator arranged in the cavity, the resonator is a metamaterial, and the metamaterial includes at least one material sheet, each A material sheet layer includes a substrate and at least two artificial microstructures attached to the substrate, and at least two of the artificial microstructures are connected by wires. the

In a preferred embodiment of the present invention, the artificial microstructure is a planar or three-dimensional structure with a certain geometric shape composed of metal wires. the

In a preferred embodiment of the present invention, a support is provided in the cavity, and the metamaterial is fixed on the support. the

In a preferred embodiment of the present invention, the support is made of a microwave transparent material. the

In a preferred embodiment of the present invention, the artificial microstructure is an I-shape or a derivative of the I-shape. the

In a preferred embodiment of the present invention, the artificial microstructure includes four branches, and any one of the branches is rotated clockwise by 90 degrees, 180 degrees and 270 degrees with one point as the rotation center, respectively, and the other three branches are respectively connected to each other. Road coincides. the

In a preferred embodiment of the present invention, the four branches have a common intersection point, and the four branches are rotated clockwise by 90 degrees, 180 degrees and 270 degrees with the intersection point as the rotation center, respectively, and are connected with the other three branches. coincide. the

In a preferred embodiment of the invention, said branch comprises at least one bend. the

In a preferred embodiment of the present invention, the bent portion of the artificial microstructure is a right angle, a rounded corner or a sharp corner. the

In a preferred embodiment of the present invention, the artificial microstructure is made of copper wire or silver wire; the substrate is ceramic material, polytetrafluoroethylene, ferroelectric material, ferrite material, ferromagnetic material, SiO2 or FR -4 made. the

Implementing the technical solution of the present invention has the following beneficial effects: by placing metamaterials in the resonant cavity and connecting at least two artificial microstructures on the substrate, the resonant frequency of the resonant cavity can be reduced, and the quality factor Q of the resonant cavity can be improved. It is beneficial to realize the miniaturization of the resonant cavity and improve the performance of the resonant cavity. the

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is the structural representation of the resonance cavity in the embodiment;

Fig. 2 is a schematic diagram of the arrangement of metal microstructures on a material sheet in Fig. 1;

Figure 3 is a schematic diagram of the arrangement when the metal microstructures on the material sheet are not connected to each other;

4 to 14 are schematic diagrams of possible structures of artificial microstructures. the

Detailed ways

This embodiment provides a resonant cavity, as shown in FIG. 1 , including a cavity 1 , a support 2 and a metamaterial 3 fixed on the support 2 . Metamaterial 3 includes 6 material sheets, each material sheet includes a substrate and an artificial microstructure attached to the substrate; the artificial microstructure can be etched by etching, electroplating, drilling, photolithography, electronic engraving or ion engraving, etc. Attached to the substrate; every two material sheets are made into a whole through a certain packaging process such as welding, riveting, bonding, etc., or filled with substances that can connect the two, such as liquid substrate raw materials, which will be solidified after curing. Two adjacent material sheets are bonded together so that multiple material sheets form a whole. the

As shown in Figure 2, a total of 6 artificial microstructures are arranged in two rows and three columns on each material sheet, and two adjacent microstructures in each row in each material sheet pass through metal wires aa', bb', cc' and dd' are connected, the substrate is made of ceramic material, and the thickness of the ceramic material is 1 mm. Of course, it can also be made of polytetrafluoroethylene, ferroelectric material, ferrite material, ferromagnetic material, SiO ₂ or FR-4. The support 2 adopts a cuboid structure made of foam. The support 2 can also be of other structures, as long as the metamaterial 3 can be fixed. The support can also be made of other microwave-transparent materials. The microwave-transparent material refers to Materials with a transmittance greater than 70% for electromagnetic waves with wavelengths ranging from 1 to 1000 mm and frequencies ranging from 0.3 to 300 GHz can be inorganic materials, polymer materials, inorganic/polymer composite materials, or diamond materials. The artificial microstructure is a structure with a certain geometric shape composed of metal wires. Here, copper wires are used for the metal wires. The cross-section of the copper wires is selected as a rectangle, and the size of the cross-sections is 0.1 mm × 0.018 mm. The width of the copper wires is The thickness of the copper wire is 0.1 mm, and the thickness of the copper wire is 0.018 mm. Of course, other metal wires such as silver wire can also be used for the metal wire. The cross section of the metal wire can also be cylindrical, flat or other shapes, and its specifications can also be other sizes. In this embodiment, the artificial microstructure includes four branches with a common intersection point, each branch includes 4 bending parts, each bending part is bent at a right angle, and any branch is clockwise with the intersection point as the center of rotation After rotating 90 degrees, 180 degrees and 270 degrees, they coincide with the other three branches respectively, and the ends of each branch away from the center of rotation are respectively connected with a line segment and connected with the midpoint of the line segment.

The cavity 1 shown in Figure 1 is a cube of 20 mm × 20 mm × 20 mm, and the size of the metamaterial is 9 mm × 6 mm × 6.108 mm. Through simulation, it can be known that the resonant frequency of the resonant cavity is 1.84 GHz, and the quality factor Q =1319. the

As shown in FIG. 3 , when the artificial microstructures on each material sheet are independent and not connected to each other, it can be known through simulation that the resonant frequency corresponding to the resonant cavity is 1.98 GHz, and the quality factor Q=31. the

From the above simulation results, it can be seen that by connecting the artificial microstructures on the material sheets, the resonant frequency of the resonant cavity can be reduced, which is conducive to the miniaturization of the resonant cavity; at the same time, the quality factor Q value has been greatly improved, and the higher the Q value, the higher the resonance frequency. The smaller the loss of the cavity, the performance of the resonant cavity of this structure has been significantly improved. the

Embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementations, and the above-mentioned specific implementations are only illustrative, rather than restrictive, and those of ordinary skill in the art will Under the enlightenment of the present invention, many deformations can also be made without departing from the purpose of the present invention and the scope of protection of the claims. For example, the artificial microstructure can also be as shown in FIGS. The branches can intersect or not intersect, and of course can be structures of other geometric shapes; the substrate in each material sheet can be a single substrate or a double substrate as described in the embodiment, and when the substrate is a double substrate, artificial The microstructure is sandwiched between two substrates; the artificial microstructure connected by wires, wherein the wires can be the additional wires described in the embodiments or a part of the artificial microstructure itself connected to each other, all of which belong to the protection of the present invention within. the

Claims (10)

1. A resonant cavity, comprising a cavity, and a resonant oscillator disposed in the cavity, characterized in that, the resonant oscillator is a metamaterial, and the metamaterial includes at least one material sheet, and each material sheet includes a substrate and At least two artificial microstructures attached to the substrate, at least two of the artificial microstructures are connected by wires. 2 . The resonant cavity according to claim 1 , wherein the artificial microstructure is a planar or three-dimensional structure with a certain geometric shape made of metal wires. 3 . 3. The resonant cavity according to claim 2, wherein a support is provided in the cavity, and the metamaterial is fixed on the support. 4. The resonant cavity according to claim 3, wherein the support is made of a microwave transparent material. 5. The resonant cavity according to any one of claims 1 to 4, wherein the artificial microstructure is an I-shape or a derivative of the I-shape. 6. The resonant cavity according to any one of claims 1 to 4, wherein the artificial microstructure includes four branches, and any one of the branches rotates clockwise by 90 degrees, 180 degrees, and degrees and 270 degrees respectively coincide with the other three branches. 7. The resonant cavity according to claim 6, characterized in that, the four branches have a common intersection point, and the four branches rotate clockwise by 90 degrees, 180 degrees and 270 degrees sequentially with the intersection point as the rotation center coincide with the other three branches respectively. 8. The resonant cavity of claim 6, wherein the branch comprises at least one bend. 9. The resonant cavity according to claim 8, wherein the bent portion of the artificial microstructure is a right angle, a rounded corner or a sharp corner. 10. The resonant cavity according to any one of claims 1 to 4, wherein the artificial microstructure is made of copper wire or silver wire; the substrate is ceramic material, polytetrafluoroethylene, ferroelectric material, Made of ferrite material, ferromagnetic material, SiO ₂ or FR-4.

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