An electric dipole Yagi antenna

Abstract

This invention discloses an electric dipole Yagi antenna, comprising a dielectric substrate and a magnetically coupled metal structure. The top surface of the dielectric substrate is provided with an electric dipole driver, a reflector, and multiple parasitic antenna elements. The reflector is located on one side of the electric dipole driver, the magnetically coupled metal structure is located on the other side of the electric dipole driver, and the parasitic antenna elements are located on the side of the magnetically coupled metal structure away from the electric dipole driver. The electric dipole Yagi antenna has a novel structure, utilizing a magnetically coupled metal structure to replace the parasitic antenna elements closest to the electric dipole driver. This significantly improves the antenna gain without changing the original size of the electric dipole Yagi antenna, making it particularly suitable for applications with limited space.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and in particular to an electric dipole Yagi antenna. Background Technology

[0002] Electric dipole Yagi antennas have excellent directivity, high gain, and a relatively low profile. They are particularly effective for direction finding and long-distance communication.

[0003] like Figure 1 As shown, a classic electric dipole antenna includes a dielectric substrate 1, a ground plane 2 on the bottom surface of the dielectric substrate 1, and a microstrip line 3, a balun 4, an electric dipole driver 5, a reflector 6, and multiple parasitic antenna elements 7 on the top surface of the dielectric substrate 1. The balun 4 connects the microstrip line 3 and the electric dipole driver 5. The reflector 6 is located on one side of the electric dipole driver 5 and is connected to the ground plane 2. The parasitic antenna elements 7 are located on the other side of the electric dipole driver 5. The reflector 6, the electric dipole driver 5, and the multiple parasitic antenna elements 7 are arranged side by side.

[0004] The way to improve the gain of an electric dipole Yagi antenna is to increase the number of parasitic antenna elements. The gain increase of one parasitic antenna element is about 0.2-0.4 dBi. However, the number of parasitic antenna elements that can be added is often limited by the space and volume constraints in the application scenario, resulting in unsatisfactory gain of miniaturized electric dipole Yagi antennas. Summary of the Invention

[0005] The main objective of this invention is to propose a novel electric dipole Yagi antenna structure, aiming to solve the problem of unsatisfactory gain in existing miniaturized electric dipole Yagi antennas.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: an electric dipole Yagi antenna, comprising a dielectric substrate and a magnetically coupled metal structure, wherein the top surface of the dielectric substrate is provided with an electric dipole driver, a reflector and a plurality of parasitic antenna elements, the reflector is located on one side of the electric dipole driver, the magnetically coupled metal structure is located on the other side of the electric dipole driver, and the parasitic antenna elements are located on the side of the magnetically coupled metal structure away from the electric dipole driver.

[0007] The beneficial effects of this invention are as follows: the electric dipole Yagi antenna has a novel structure, which uses a magnetically coupled metal structure to replace the parasitic antenna element closest to the electric dipole driver. Without changing the original size of the electric dipole Yagi antenna, the antenna gain is greatly improved, making it particularly suitable for applications where space is limited. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the structure of a conventional electric dipole Yagi antenna;

[0010] Figure 2 This is a perspective view of the electric dipole Yagi antenna according to Embodiment 1 of the present invention;

[0011] Figure 3 This is a schematic diagram of the electric dipole Yagi antenna according to Embodiment 1 of the present invention;

[0012] Figure 4 This is a comparison chart of the gain test results of the ordinary electric dipole Yagi and the improved electric dipole Yagi in Embodiment 1 of the present invention.

[0013] Explanation of icon numbers:

[0014] 1. Dielectric substrate;

[0015] 2. Strata;

[0016] 3. Microstrip lines;

[0017] 4. Barron;

[0018] 5. Electric dipole actuator;

[0019] 6. Reflector;

[0020] 7. Parasitic antenna element;

[0021] 8. Magnetic coupling metal structure; 81. Magnetic coupling metal sheet; 82. Grounding metal sheet; 83. Conductive post;

[0022] 9. Power supply connector. Detailed Implementation

[0023] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that if the embodiments of the present invention involve directional indicators such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, if the embodiments of the present invention involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0027] Furthermore, if the meaning of "and / or" appears throughout the text, it refers to three parallel solutions. For example, "and / or" includes solution 1, solution 2, and solution 3, which simultaneously satisfy the above conditions. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] Example 1

[0030] Please refer to Figures 2 to 4 Embodiment 1 of the present invention is as follows: Figure 2 and Figure 3 As shown, an electric dipole Yagi antenna includes a dielectric substrate 1 and a magnetically coupled metal structure 8. The bottom surface of the dielectric substrate 1 is provided with a ground layer 2, and the top surface of the dielectric substrate 1 is provided with a microstrip line 3, a balun 4, an electric dipole driver 5, a reflector 6, and a plurality of parasitic antenna elements 7. The balun 4 connects the microstrip line 3 and the electric dipole driver 5. The reflector 6 is located on one side of the electric dipole driver 5 and is connected to the ground layer 2. The magnetically coupled metal structure 8 is located on the other side of the electric dipole driver 5, and the parasitic antenna elements 7 are located on the side of the magnetically coupled metal structure 8 away from the electric dipole driver 5.

[0031] The magnetically coupled metal structure 8 includes a magnetically coupled metal sheet 81 and a grounding metal sheet 82. The magnetically coupled metal sheet 81 is disposed on the top surface of the dielectric substrate 1, and the grounding metal sheet 82 is disposed on the bottom surface of the dielectric substrate 1. The dielectric substrate 1 contains a plurality of conductive posts 83 arranged in a U-shape, with the openings of the U-shape facing the electric dipole driver 5. The conductive posts 83 connect the magnetically coupled metal sheet 81 and the grounding metal sheet 82. The grounding metal sheet 82 may or may not be connected to the ground layer 2.

[0032] Specifically, the magnetically coupled metal sheet 81 is rectangular and is arranged side-by-side with the parasitic antenna element 7. The conductive posts 83 are arranged along the edge of the magnetically coupled metal sheet 81. That is, only the side of the magnetically coupled metal sheet 81 closest to the electric dipole driver 5 is not connected to the conductive posts 83, while the other three sides are connected to multiple conductive posts 83. The conductive posts 83 are metallized holes or metal posts.

[0033] Furthermore, the length of the magnetically coupled metal sheet 81 is less than the length of the parasitic antenna element 7, and the width of the magnetically coupled metal sheet 81 is greater than the width of the parasitic antenna element 7.

[0034] One axis of symmetry of the magnetically coupled metal sheet 81 is coaxial with one axis of symmetry of the parasitic antenna element 7. Since the parasitic antenna element 7 is also rectangular, it also has two axes of symmetry: the axis of symmetry of the magnetically coupled metal sheet 81 perpendicular to its own long side is coaxial with the axis of symmetry of the parasitic antenna element 7 perpendicular to its own long side.

[0035] In detail, the reflector 6 includes a first metal plate and a second metal plate arranged in a collinear manner. The first metal plate and the second metal plate are respectively grounded through a plurality of grounding posts. A gap is formed between the first metal plate and the second metal plate for the balun 4 to pass through. The grounding posts are metallized holes or metal posts.

[0036] The dielectric substrate 1 is also provided with a power supply connector 9, the outer conductor of the power supply connector 9 is connected to the ground layer 2, and the core of the power supply connector 9 is connected to the microstrip line 3.

[0037] To demonstrate the advantages of this electric dipole Yagi antenna compared to a conventional electric dipole Yagi antenna, the inventor controlled the variables and conducted gain experiments.

[0038] Control group (ordinary electric dipole Yagi): has five parasitic antenna elements, structure as follows Figure 1 As shown.

[0039] Experimental group (improved electric dipole Yagi): It has one magnetically coupled metallic structure and four parasitic antenna elements, as shown in the following structure. Figure 2 As shown.

[0040] Figure 4 This is a comparison chart of the gain test results between a standard electric dipole Yagi and a modified electric dipole Yagi. Figure 4 It can be seen that, without increasing the overall volume of the electric dipole antenna, the gain of the improved electric dipole Yagi antenna disclosed in this embodiment is increased by 1-2 dBi.

[0041] The above are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An electric dipole Yagi antenna, characterized in that: The device includes a dielectric substrate and a magnetically coupled metal structure. The top surface of the dielectric substrate is provided with an electric dipole driver, a reflector, and multiple parasitic antenna units. The reflector is located on one side of the electric dipole driver, the magnetically coupled metal structure is located on the other side of the electric dipole driver, and the parasitic antenna units are located on the side of the magnetically coupled metal structure away from the electric dipole driver. The magnetically coupled metal structure includes a magnetically coupled metal sheet and a grounded metal sheet. The magnetically coupled metal sheet is disposed on the top surface of the dielectric substrate, and the grounded metal sheet is disposed on the bottom surface of the dielectric substrate. The dielectric substrate has a plurality of conductive posts arranged in a U-shape, and the opening of the U-shape faces the electric dipole driver. The conductive posts connect the magnetically coupled metal sheet and the grounded metal sheet. The magnetically coupled metal sheet is rectangular and is arranged side by side with the parasitic antenna element; The conductive post is disposed along the edge of the magnetically coupled metal sheet; The length of the magnetically coupled metal sheet is less than the length of the parasitic antenna element, and the width of the magnetically coupled metal sheet is greater than the width of the parasitic antenna element. One axis of symmetry of the magnetically coupled metal sheet is coaxial with one axis of symmetry of the parasitic antenna element.

2. The electric dipole Yagi antenna according to claim 1, characterized in that: The conductive post is a metallized hole or a metal post.

3. The electric dipole Yagi antenna according to claim 1, characterized in that: The bottom surface of the dielectric substrate is provided with a ground layer, and the top surface of the dielectric substrate is also provided with a microstrip line and a balun. The balun connects the microstrip line and the electric dipole driver. The reflector is connected to the ground layer. The reflector includes a first metal plate and a second metal plate arranged collinearly. The first metal plate and the second metal plate are respectively grounded through multiple grounding posts. A gap is formed between the first metal plate and the second metal plate for the balun to pass through.

4. The electric dipole Yagi antenna according to claim 3, characterized in that: The grounding post is a metallized hole or a metal post.

5. The electric dipole Yagi antenna according to claim 3, characterized in that: The dielectric substrate is also provided with a power feed connector, the outer conductor of which is connected to the ground layer, and the core of which is connected to the microstrip line.

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