Cavity waveguide antenna

Abstract

The utility model discloses a cavity waveguide antenna, which comprises a feed layer and a radiation layer matched with the feed layer, protrusions are distributed on the surface, in contact with the radiation layer, of the feed layer, and blind holes matched with the protrusions are formed in the surface, in contact with the feed layer, of the radiation layer. According to the utility model, the projection arrays and the holes corresponding to the projection arrays are constructed on the radiation layer and the feed layer, and the conductive connection material is filled in the holes or holes as a connection mode, so that the projection and through hole matching structure only needs to ensure that the projection arrays are fully contacted with the corresponding blind holes or groove structures; therefore, the propagation path of the electromagnetic wave can be limited in the required channel, and the anti-leakage effect of the electromagnetic wave of the cavity waveguide antenna is better.

Description

Technical Field

[0001] The utility model relates to the technical field of waveguide devices, in particular to a cavity waveguide antenna. Background Art

[0002] Waveguide devices are microwave components that use waveguide structures to control or process electromagnetic waves. The main function of waveguide devices is to guide the propagation of electromagnetic waves. By designing the structure and size of the waveguide, the transmission characteristics of electromagnetic waves can be precisely controlled. The assembly of multi-layer waveguide antennas requires that the layers fit tightly together. Once there is a gap, electromagnetic waves will leak from the channel, and the antenna performance will be affected.

[0003] Existing assembly and bonding methods often use methods such as screw locking, SMT soldering, hot melt welding, and conductive adhesive coating, which not only requires each layer of the waveguide plate to have extremely high processing accuracy and flatness, but also places extremely high demands on the assembly and bonding effect. Whether it is insufficient flatness or poor assembly and bonding effect, gaps will be generated, resulting in electromagnetic wave leakage problems. Utility Model Content

[0004] The utility model aims to provide a cavity waveguide antenna to solve the technical problem of electromagnetic wave leakage of the cavity waveguide antenna in the prior art, because the existing cavity waveguide antenna cannot ensure extremely high flatness between waveguide plates in the manufacturing process.

[0005] In order to solve the above technical problems, the utility model specifically provides the following technical solutions:

[0006] A cavity waveguide antenna comprises a feed layer and a radiation layer matched with the feed layer, wherein the surface of the feed layer in contact with the radiation layer is distributed with protrusions, and the surface of the radiation layer in contact with the feed layer is provided with blind holes matched with the protrusions.

[0007] As a preferred solution of the utility model, the protrusions are distributed on the surface of the feed layer around the feed lines of the feed layer.

[0008] As a preferred solution of the utility model, the protrusion includes but is not limited to an ellipsoid structure, a cylindrical structure or a cuboid structure.

[0009] As a preferred solution of the utility model, a conductive connector is filled in the blind hole, so that the protrusion is connected to the blind hole, and the surfaces of the feed layer and the radiation layer are in contact;

[0010] The conductive connecting material includes but is not limited to solder paste, conductive adhesive, pressure-sensitive adhesive tape or copper foil.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] The utility model constructs a protrusion array and corresponding holes on the radiation layer and the feeding layer, and fills the holes or cavities with conductive connecting materials as a connecting method. The matching structure of the protrusion and the through hole only needs to ensure that the protrusion array and the corresponding blind hole or slot structure are in full contact, so as to limit the propagation path of the electromagnetic wave to the required channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0014] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0015] Figure 2 It is a schematic diagram of the overall structure of the other side of an embodiment of the utility model;

[0016] Figure 3 Schematic diagram of the change of the gap ym between the feeding layer and the radiation layer according to the spacing p between two adjacent first structures, specifically protrusions, in an embodiment of the present invention.

[0017] The numbers in the figure represent the following:

[0018] 1-feeding layer; 2-radiation layer; 3-bump; 4-blind hole, 5-feeding line; 6-radiation layer slot. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figure 1 and Figure 2 As shown, the utility model provides a cavity waveguide antenna, including a feeding layer 1 and a radiating layer 2 matched with the feeding layer 1, the surface where the feeding layer 1 contacts with the radiating layer 2 is distributed with protrusions 3, and the surface where the radiating layer 2 contacts with the feeding layer 1 is provided with blind holes 4 matched with the protrusions 3.

[0021] Compared with the existing cavity waveguide antenna which requires large-area bonding between layers or bonding around the channel, the cavity waveguide antenna provided by the utility model only needs to ensure that the protrusion 3 and the blind hole 4 are provided on the contact surface of the feeding layer 1 and the radiation layer 2, and the protrusion 3 and the blind hole 4 are fully in contact and bonded.

[0022] The protrusions 3 and the through holes 4 are connected and evenly distributed around the transmission channel of the antenna electromagnetic wave formed by the feeding layer 1 and the radiation layer 2, so as to confine the electromagnetic wave in the transmission channel.

[0023] That is, when a plurality of feed lines 5 are arranged on the surface of the feed layer 1, the metal protrusions 3 are distributed around the feed lines 5, and the feed lines 5 of the feed layer 1 (or the groove body for installing the waveguide ridge) and the radiation layer groove 6 of the radiation layer 2 are connected to form a transmission channel for the antenna electromagnetic wave. The protrusions 3 are specifically formed of metal material.

[0024] In the specific implementation of the distribution of the protrusions 3 on the surface of the feed layer 1, the protrusions 3 are distributed on the surface of the feed layer 1 around the feed line of the feed layer 1, that is, they are located around the feed line 5, and the protrusions 3 located on both sides of the feed line are arranged one by one or symmetrically, the purpose of which is to make the electric field formed by the electromagnetic wave of the cavity waveguide antenna in the feed line have no mismatch, so as to achieve a good electromagnetic shielding effect, as shown in the following example. Figure 3 shown.

[0025] The protrusions 3 are distributed on the surface of the feed layer 1 around the feed line 5 of the feed layer 1 , and the corresponding radiation layer 2 is provided with a radiation layer groove 6 matching the feed line 5 , and the blind hole 4 is arranged on the surface of the radiation layer 2 around the radiation layer groove 6 .

[0026] In actual design, the structure in which the protrusion 3 and the blind hole 4 are connected in the utility model is not limited to the feeding layer 1 and the radiation layer 2, but can also be arranged on other hierarchical structures of the cavity waveguide antenna.

[0027] The protrusion 3 includes but is not limited to an ellipsoid structure, a cylindrical structure or a rectangular parallelepiped structure.

[0028] Fill the blind hole 4 with a conductive connection material, so that the protrusion 3 is connected to the blind hole 4, and the surfaces of the feed layer 1 and the radiation layer 2 are in contact;

[0029] Conductive connections include, but are not limited to, solder paste, conductive adhesive, pressure-sensitive tape, or copper foil.

[0030] Compared with the existing antenna structure in which the radiation layer and the feed layer are connected by large-area solder paste welding or conductive glue coating, the utility model does not need to have high requirements on the fit of the surface processing of the feed layer and the radiation layer. Therefore, the redundancy between the various layer structures of the cavity waveguide antenna is greater. Therefore, the cavity waveguide antenna provided by the present application has good conductivity and airtightness, thereby ensuring the yield rate of the cavity waveguide antenna during preparation.

[0031] Furthermore, during the preparation process of the cavity waveguide antenna provided in the utility model, the protrusion and blind hole connection method allows a gap between the radiation layer and the feeding layer without causing leakage of electromagnetic waves, which provides a larger operating window for the processing between the layers of the cavity waveguide antenna.

[0032] The utility model is based on the fact that electromagnetic leakage still occurs when the surface contact between the radiation layer and the feeding layer of the existing antenna can be as close as possible, but it does not mean that the surface gap between the radiation layer and the feeding layer can be as large as possible. Specifically:

[0033] The protrusions arranged around the feeder are hemispherical structures, whose diameter (effective length) is d, the distance between the two protrusions is p, and the gap between the radiation layer and the feeder is ym.

[0034] Different protrusions require corresponding spacing p to achieve a better effect of preventing electromagnetic wave leakage. Ports are added at both ends of the feeder, and the length of the feeder is set to 10λ. When ym=0mm, the transmission coefficient of the feeder S21=0.35dB.

[0035] When ym is greater than 0mm, the return loss S11 of the feeder is less than -15dB, and the transmission coefficient S21 is less than 0.5dB. It can be considered that the feeder has a good shielding effect on electromagnetic waves.

[0036] Figure 3 When the electromagnetic shielding effect is better, the gap ym between the radiation layer and the feeder changes with the spacing p under different protrusion diameters of the hemispherical structure.

[0037] Figure 3 The five curves in the figure represent the variation trend of the gap ym between the radiation layer and the feeder with the spacing p when the diameter of the hemispherical protrusion is 0.5mm, 1mm, 2mm, 3mm and 4mm respectively. The area below each line indicates that the electromagnetic shielding effect of the feeder is good and there is no impedance mismatch of the transmission line.

[0038] For example Figure 3 When d=1mm, p=1.5mm and the gap ym=0.3mm, it indicates that the electromagnetic wave shielding is good and there is no mismatch.

[0039] The electric field distribution on the surface of the feeder shows that there is no electromagnetic leakage, and the S parameters of the feeder indicate that the impedance matching is good.

[0040] like Figure 3 As shown, d=1mm, p=2.5mm, when the gap ym=0.2mm, there is electromagnetic leakage and impedance mismatch.

[0041] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A cavity waveguide antenna, comprising a feed layer (1) and a radiation layer (2) matched with the feed layer (1), characterized in that: The surface of the feed layer (1) in contact with the radiation layer (2) is provided with protrusions (3), and the surface of the radiation layer (2) in contact with the feed layer (1) is provided with blind holes (4) matching with the protrusions (3).

2. A cavity waveguide antenna according to claim 1, characterized in that: The protrusions (3) are distributed on the surface of the feed layer (1) around the feed line of the feed layer (1).

3. The cavity waveguide antenna according to claim 1, characterized in that: The protrusion (3) comprises an ellipsoid structure, a cylindrical structure or a rectangular parallelepiped structure.

4. The cavity waveguide antenna according to claim 1, characterized in that: Filling the blind hole (4) with a conductive connector so that the protrusion (3) is connected to the blind hole (4) and the surfaces of the feed layer (1) and the radiation layer (2) are in contact; The conductive connecting material includes solder paste, conductive adhesive, pressure-sensitive adhesive tape or copper foil.

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