A microstrip antenna

Abstract

The present invention provides a microstrip antenna. The microstrip antenna includes a dielectric substrate, a coupled feeding layer, and an antenna layer. The coupled feeding layer is located above the dielectric substrate, and the antenna layer is located above the coupled feeding layer. By the above method, without significantly increasing the dielectric constant, the stable gain of the antenna is ensured and the antenna resonance frequency is reduced, so as to achieve the purpose of reducing the antenna volume.

Description

Technical Field

[0001] The present invention relates to the field of satellite navigation communication, and particularly to a microstrip antenna. Background Art

[0002] With the continuous deepening and innovation of the application of China's Beidou satellite communication system, vehicle-mounted, airborne, and shipborne satellite navigation devices are also constantly developing. In the past decade, satellite navigation devices have been developing towards miniaturization, integration, and modularization, which inevitably requires the antenna to be miniaturized and integrated, and the space left for the antenna will become more and more crowded. In order to reduce the volume of the antenna, the common practice in the industry at present is to increase the dielectric constant of the microstrip antenna in exchange for a reduction in the antenna volume. This approach is effective within a certain range. However, if the dielectric is continuously increased, it will lead to a continuous increase in the antenna Q value, a continuous reduction in the bandwidth, and a sharper resonance response, which will inevitably sacrifice the antenna performance significantly. Summary of the Invention

[0003] To solve the above problems, the present invention proposes a microstrip antenna, which is used to solve the technical problems of ensuring stable gain of the antenna and reducing the antenna resonance frequency without significantly increasing the dielectric, and reducing the antenna volume.

[0004] The present invention is achieved through the following technical solutions:

[0005] The present invention proposes a microstrip antenna, which includes a dielectric substrate, a coupled feeding layer, and an antenna layer. The coupled feeding layer is located above the dielectric substrate, and the antenna layer is located above the coupled feeding layer.

[0006] Further, the coupled feeding layer is composed of several feeding strip lines, the feeding strip lines are located in the middle of the dielectric substrate, and the feeding strip lines are orthogonal to the dielectric substrate.

[0007] Further, the antenna layer is composed of several bow-shaped arcs, a strip-shaped protrusion is provided in the middle of the inner side of the bow-shaped arc, and apex angles are provided at both ends of the bow-shaped arc.

[0008] Further, the dielectric constant of the coupled feeding layer is 3.8, the dielectric constant of the antenna layer is 7.6, and the dielectric substrate is made of PCB material.

[0009] Advantages of the Present Invention

[0010] The present invention proposes a microstrip antenna. The antenna layer adopts a bow-shaped arc structure, and the coupled feeding layer adopts an electromagnetic coupling feeding method. Without significantly increasing the dielectric, it ensures stable gain of the antenna and reduces the antenna resonance frequency, achieving the purpose of reducing the antenna volume.

[0011] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other objects, features and advantages of the present invention more obvious and understandable, the following preferred embodiments are specifically described in detail as follows. Brief Description of the Drawings

[0012] Figure 1 is a schematic exploded view of a microstrip antenna of the present invention;

[0013] Figure 2 is a schematic structural view of a microstrip antenna of the present invention.

[0014] Description of the reference numerals in the drawings:

[0015] Dielectric substrate 1, coupling feed layer 2, feed strip part 21, first feed strip part 211, second feed strip part 212, antenna layer 3, arcuate arc 31, first arcuate arc 311, left apex angle 3111 of the first arcuate arc, right apex angle 3112 of the first arcuate arc, second arcuate arc 312, left apex angle 3121 of the second arcuate arc, right apex angle 3122 of the second arcuate arc, third arcuate arc 313, left apex angle 3131 of the third arcuate arc, right apex angle 3132 of the third arcuate arc, fourth arcuate arc 314, left apex angle 3141 of the fourth arcuate arc, right apex angle 3142 of the fourth arcuate arc, strip-shaped protrusion 4, first strip-shaped protrusion 41, second strip-shaped protrusion 42, third strip-shaped protrusion 43, fourth strip-shaped protrusion 44. Detailed Description of the Preferred Embodiments

[0016] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. These terms are only used for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0019] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0020] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it can be a connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0022] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0023] Please refer to Figure 1 - Figure 2 , the present invention provides a microstrip antenna, which includes a dielectric substrate 1, a coupled feeding layer 2, and an antenna layer 3. The coupled feeding layer 2 is located above the dielectric substrate 1, and the antenna layer 3 is located above the coupled feeding layer 2. The antenna made in the above manner ensures stable gain of the antenna and reduces the antenna resonance frequency without significantly increasing the dielectric, achieving the purpose of reducing the antenna volume.

[0024] The coupled feeding layer 2 is located above the dielectric substrate 1. The coupled feeding layer 2 is composed of several feeding strip parts 21. In this embodiment, the coupled feeding layer 2 is composed of a first feeding strip part 211 and a second feeding strip part 212. The first feeding strip part 211 is located in the middle of the right side of the dielectric substrate 1, and the first feeding strip part 211 is orthogonal to the dielectric substrate 1. The second feeding strip part 212 is located in the middle of the front side of the dielectric substrate 1, and the second feeding strip part 212 is orthogonal to the dielectric substrate 1. In this embodiment, the dielectric constant of the coupled feeding layer 2 is 3.8, and the feeding strip part has a length of 15 mm and a width of 2 mm. By setting the coupled feeding layer 2, the switching between different frequency bands is realized, and different frequency bands are combined, thus realizing the multi-band / wide-band characteristics and improving the comprehensive performance of the antenna. In this embodiment, a dual-feed structure composed of the first feeding strip part 211 and the second feeding strip part 212 is adopted. In practical applications, a coupled feeding layer composed of four feeding strip parts can be selected according to actual situations.

[0025] The antenna layer 3 is located above the coupling feed layer 2. In this embodiment, the dielectric constant of the antenna layer 3 is 7.6 and the thickness of the antenna layer 3 is 5 mm. The antenna layer 3 is composed of a number of bow-shaped arcs 31. In this embodiment, the antenna layer 3 is composed of a first bow-shaped arc 311, a second bow-shaped arc 312, a third bow-shaped arc 313, and a fourth bow-shaped arc 314. On the left side of the first bow-shaped arc 311, there is a first left vertex angle 3111 of the bow-shaped arc, and on the right side of the first bow-shaped arc 311, there is a first right vertex angle 3112 of the bow-shaped arc. On the left side of the second bow-shaped arc 312, there is a second left vertex angle 3121 of the bow-shaped arc, and on the right side of the second bow-shaped arc 312, there is a second right vertex angle 3122 of the bow-shaped arc. On the left side of the third bow-shaped arc 313, there is a third left vertex angle 3131 of the bow-shaped arc, and on the right side of the third bow-shaped arc 313, there is a third right vertex angle 3132 of the bow-shaped arc. On the left side of the fourth bow-shaped arc 314, there is a fourth left vertex angle 3141 of the bow-shaped arc, and on the right side of the fourth bow-shaped arc 314, there is a fourth right vertex angle 3142 of the bow-shaped arc. The first left vertex angle 3111 of the bow-shaped arc is connected to the second right vertex angle 3122 of the bow-shaped arc, the second left vertex angle 3121 of the bow-shaped arc is connected to the third right vertex angle 3132 of the bow-shaped arc, the third left vertex angle 3131 of the bow-shaped arc is connected to the fourth right vertex angle 3142 of the bow-shaped arc, and the fourth left vertex angle 3141 of the bow-shaped arc is connected to the first right vertex angle 3112 of the bow-shaped arc. The antenna layer 3 formed by connecting the vertex angles on the left and right sides of the first bow-shaped arc 311, the second bow-shaped arc 312, the third bow-shaped arc 313, and the fourth bow-shaped arc 314 enables the antenna to have stable gains. When designing the bow-shaped arc 31, the thickness of the arc of the bow-shaped arc 31 and the curvature of the inner concave of the arc can be designed according to the actual situation. In the middle of the inner side of the first bow-shaped arc 311, there is a first strip-shaped convex part 41. In the middle of the inner side of the second bow-shaped arc 312, there is a second strip-shaped convex part 42. In the middle of the inner side of the third bow-shaped arc 313, there is a third strip-shaped convex part 43. In the middle of the inner side of the fourth bow-shaped arc 314, there is a fourth strip-shaped convex part 44. In this embodiment, the strip-shaped convex part is 2.8 mm long and 2 mm wide. By setting the strip-shaped convex part 4 in the middle of the inner side of the bow-shaped arc 31, the overall performance of the antenna is adjusted. The thickness of the antenna layer 3 is not limited to 5 mm in this example and can be designed according to actual needs.

[0026] In this embodiment, the dielectric substrate 1 is made of PCB material.

[0027] When the antenna composed of the above dielectric substrate 1, coupling feed layer 2, and antenna layer 3 is actually used, the return loss of the antenna can be less than -20 dB, the gain of the antenna can reach 7.2 dB, and the axial ratio is less than 5 dB within ±30°.

[0028] The above is only to further illustrate the technical content of the present invention with examples for the convenience of readers to understand, but it does not mean that the implementation mode of the present invention is limited to this. Any technical extension or re-creation based on the present invention is protected by the present invention. The protection scope of the present invention is subject to the claims.

Claims

1. A microstrip antenna, characterized in that, It includes a dielectric substrate, a coupled feeding layer, and an antenna layer. The coupled feeding layer is located above the dielectric substrate, and the antenna layer is located above the coupled feeding layer. The antenna layer is composed of four bow-shaped arcs; a strip-shaped protrusion is provided in the middle of the inner side of each bow-shaped arc; a vertex angle is provided at both ends of each bow-shaped arc, and adjacent bow-shaped arcs are connected through the vertex angle to form a closed-loop structure; the coupled feeding layer is composed of two feeding strip parts; the feeding strip parts are orthogonally distributed with respect to the dielectric substrate.

2. The microstrip antenna according to claim 1, wherein The feeding strip part is located in the middle of the dielectric substrate.

3. The microstrip antenna according to claim 1, characterized in that, The dielectric constant of the coupled feeding layer is 3.

8.

4. The microstrip antenna according to claim 1, wherein The dielectric constant of the antenna layer is 7.

6.

5. The microstrip antenna according to claim 1, characterized in that The dielectric substrate is made of PCB material.

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