CN215732190U

CN215732190U - Multi-frequency microstrip antenna with double-microstrip resonance structure

Info

Publication number: CN215732190U
Application number: CN202121451808.3U
Authority: CN
Inventors: 伍锐明; 张光旻; 纪成光
Original assignee: Dongguan University of Technology; Shengyi Electronics Co Ltd
Current assignee: Dongguan University of Technology; Shengyi Electronics Co Ltd
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2022-02-01
Anticipated expiration: 2031-06-28

Abstract

The utility model discloses a multi-frequency microstrip antenna with a double-microstrip resonance structure, which comprises a dielectric substrate, a radiator, a ground plate, a feeder line and a parasitic resonator formed by slotting on the radiator. The parasitic resonator is formed by combining a first short-circuit coupling branch section in a U shape and a second short-circuit coupling branch section in a straight shape. The first short circuit coupling branch section is composed of a transverse branch, a first vertical branch and a second vertical branch, wherein the first vertical branch and the second vertical branch are connected to two ends of the same side of the transverse branch and are parallel to each other. The second short circuit coupling branch is a strip extending along the transverse direction, and is positioned on one side of the first vertical branch and one side of the second vertical branch, which are far away from the transverse branch, and is opposite to the transverse branch. The parasitic resonator is formed by a plurality of mutually connected slotted branches on the radiator, and has compact structure and small volume; and the structure does not need to be additionally arranged on the basis of the original microstrip antenna, and the microstrip antenna has a simple structure and is easy to manufacture.

Description

Multi-frequency microstrip antenna with double-microstrip resonance structure

Technical Field

The utility model relates to the technical field of communication antenna design, in particular to a multi-frequency microstrip antenna with a double-microstrip resonance structure.

Background

The performance of the antenna, which is a key device for signal transmission and signal reception in a communication system, will directly affect the performance of the entire communication system. With the rapid development of communication technology, antennas are required to be capable of multi-band operation to accommodate more communication protocols.

At present, the design of the multi-frequency antenna is mainly realized by adopting the forms of frequency doubling design, loading of a plurality of resonance branches, loading of parasitic branches and the like. The frequency doubling design is that a plurality of frequency bands are realized in a single branch by reasonably utilizing a harmonic principle, but the multi-frequency of the antenna with a standard structure is realized by odd-number-times fundamental waves, the high-frequency resonance points of few multi-frequency antennas in the actual antenna design are just on the odd-number-times fundamental waves, if the frequency doubling points are to be adjusted, the antenna structure needs to be changed (the radiating bodies are bent and the like), and the design is complex. The multiple resonance branches are loaded to realize multiple frequencies, and particularly, multiple independent resonators are additionally arranged on the antenna, so that the structure of the antenna is increased, the size of the antenna is larger, and the requirement of the miniaturization design of the antenna cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a multi-frequency microstrip antenna with a double-microstrip resonance structure, which has a simple structure and a small volume.

In order to achieve the above object, the multi-frequency microstrip antenna having a dual microstrip resonance structure according to the present invention includes a dielectric substrate, a radiator disposed on an upper surface of the dielectric substrate, a ground plate disposed on a lower surface of the dielectric substrate, a feed line connected to the radiator, and a parasitic resonator formed on the radiator. The parasitic resonator is a slot on the radiator and comprises a first short-circuit coupling branch and a second short-circuit coupling branch which are arranged at intervals. The first short circuit coupling branch section is composed of a transverse branch, a first vertical branch and a second vertical branch, wherein the first vertical branch and the second vertical branch are connected to two ends of the same side of the transverse branch and are parallel to each other. The second short circuit coupling branch is in a strip shape extending along the transverse direction, and the second short circuit coupling branch is located on one side, away from the transverse branch, of the first vertical branch and the second vertical branch and is arranged opposite to the transverse branch.

Compared with the prior art, the parasitic resonator is formed by slotting on the radiator, the parasitic resonator is formed by combining the first short-circuit coupling branch section which is approximately in a U shape and the second short-circuit coupling branch section which is in a straight shape, and the current path is changed by slotting to realize multi-frequency work. In addition, the first short circuit coupling branch of the utility model is composed of a plurality of mutually connected slotted branches on the radiator, and the parasitic resonator has compact structure and small volume; and the structure does not need to be additionally arranged on the basis of the original microstrip antenna, and the microstrip antenna has a simple structure and is easy to manufacture.

Specifically, the second short circuit coupling branch is located between extension lines of the first vertical branch and the second vertical branch in the vertical direction.

Specifically, the horizontal branch is formed at an upper position of the radiator, the first vertical branch and the second vertical branch are connected to lower sides of the horizontal branch, the second short-circuit coupling branch is located at lower sides of the first vertical branch and the second vertical branch, and the feeder line is connected to a middle position of a lower edge of the radiator.

Specifically, the second short-circuit coupling branch, the transverse branch, the first vertical branch and the second vertical branch are rectangular, the first vertical branch and the second vertical branch are perpendicular to the transverse branch, and the second short-circuit coupling branch is parallel to the transverse branch.

Specifically, the parasitic resonator takes a central axis of the transverse branch in the vertical direction as a symmetry axis and is in a symmetrical shape.

Specifically, the transverse size of the transverse branch is 23mm, the vertical size of the transverse branch is 2mm, the vertical sizes of the first vertical branch and the second vertical branch are 11mm, the transverse size of the first vertical branch is 1.5mm, the transverse size of the second short circuit coupling branch is 16mm, and the vertical size of the second short circuit coupling branch is 2 mm.

Specifically, the radiator is rectangular, the lateral dimension of the radiator is 37.26mm, the vertical dimension of the radiator is 30.21mm, and the parasitic resonator is formed in the middle of the radiator.

Specifically, the feeder line is a long-strip-shaped metal patch which is arranged on the upper surface of the dielectric substrate and extends vertically, and the feeder line and the second short-circuit coupling branch are located on the same straight line in the vertical central axis.

In particular, the impedance of the feed line is 50 ohms.

Specifically, the dielectric substrate is an FR4 board, the thickness is 1.6mm, and the dielectric constant is 4.3.

Drawings

Fig. 1 is a schematic structural diagram of an upper surface of a multi-frequency microstrip antenna having a dual microstrip resonance structure according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a lower surface of a multi-frequency microstrip antenna having a dual microstrip resonance structure according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a parasitic resonator according to an embodiment of the present invention.

Figure 4 is a graph of antenna reflection coefficient versus frequency without a loaded parasitic resonator.

Fig. 5 is a graph of reflection coefficient of a multi-frequency microstrip antenna having a dual microstrip resonance structure according to an embodiment of the present invention.

Detailed Description

The following detailed description is given with reference to the accompanying drawings for illustrating the contents, structural features, and objects and effects of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "lateral", "vertical", "left", "right", "middle", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, and thus are not to be construed as limiting the scope of the present invention. The "horizontal direction" and the "vertical direction" are two directions perpendicular to each other on the same plane.

Referring to fig. 1 to 3, an embodiment of the utility model discloses a multi-frequency microstrip antenna with a dual microstrip resonance structure, which includes a dielectric substrate 1, a radiator 2, a ground plate 3, a feeder line 4, and a parasitic resonator 5. The radiator 2 is disposed on the upper surface of the dielectric substrate 1 to radiate electromagnetic waves. The grounding plate 3 is disposed on the lower surface of the dielectric substrate 1 for reflecting electromagnetic waves. The feed line 4 is connected to the radiator 2 to feed the radiator 2. The parasitic resonator 5 is formed on the radiator 2.

Specifically, the parasitic resonator 5 is formed by notching the radiator 2. As shown in fig. 1 and 3, the parasitic resonator 5 includes a first short-circuit coupling branch 51 and a second short-circuit coupling branch 52 arranged at a distance. The first short-circuit coupling branch 51 is substantially U-shaped, and comprises a transverse branch 511, and a first vertical branch 512 and a second vertical branch 513 which are connected to two ends of the same side of the transverse branch 511 and are parallel to each other. The second short-circuit coupling branch 52 is a strip extending along the transverse direction, and the second short-circuit coupling branch 52 is located on one side of the first vertical branch 512 and the second vertical branch 513 away from the transverse branch 511 and faces the transverse branch 511.

In the embodiment shown in fig. 1 and 3, the dimension of the second short-circuit coupling branch 52 in the transverse direction is smaller than that of the transverse branch 511, and the second short-circuit coupling branch 52 is located between the extensions of the first vertical branch 512 and the second vertical branch 513 in the vertical direction. Of course, the specific implementation is not limited thereto.

As shown in fig. 3, the second short-circuit coupling branch 52, the transverse branch 511, the first vertical branch 512, and the second vertical branch 513 are all rectangular, the first vertical branch 512 and the second vertical branch 513 are both perpendicular to the transverse branch 511, and the second short-circuit coupling branch 52 is parallel to the transverse branch 511. Further, the parasitic resonator 5 is in a left-right symmetrical shape (taking the angle shown in fig. 3 as an example) with the horizontal branch 511 and the second short-circuit coupling branch 52 as the symmetry axis, and the shape of the parasitic resonator 5 is regular and easy to manufacture.

As a preferred embodiment, transverse branch 511 has a transverse dimension of 23mm and a vertical dimension of 2 mm; the vertical sizes of the first vertical branch 512 and the second vertical branch 513 are 11mm, and the transverse sizes are 1.5 mm; the second short-circuit coupling branch 52 has a transverse dimension of 16mm and a vertical dimension of 2 mm. The radiator 2 is a rectangular metal patch, the lateral dimension of the radiator 2 is 37.26mm, the vertical dimension is 30.21mm, and the parasitic resonator 5 is formed at the middle position of the radiator 2. Therefore, the design is realized, and better radiation performance is obtained.

In this embodiment, the dielectric substrate 1 is made of FR4 board with a thickness of 1.6mm and a dielectric constant of 4.3, and is in a rectangular shape with a vertical dimension of 77.765mm and a lateral dimension of 74.52 mm. The grounding plate 3 is a rectangular metal patch with a vertical dimension of 77.765mm and a transverse dimension of 74.52mm, namely the grounding plate 3 is fully distributed on the whole lower surface of the dielectric substrate 1.

Of course, the sizes of the

branches

511 and 513 of the first short-circuit coupling branch 51 and the size of the second short-circuit coupling branch 52 may be adaptively adjusted according to specific requirements, and are not limited to the sizes illustrated in the embodiment, and the shapes of the radiator 2 and the ground plate 3 are not limited to a rectangle, and in a specific implementation, the design of a microstrip antenna with different radiation characteristics may also be implemented by changing the geometric shape of the radiator 2.

As shown in fig. 1, the radiator 2 is located at the middle upper position of the upper surface of the dielectric substrate 1, the horizontal branch 511 is formed at the upper position of the radiator 2, the first vertical branch 512 and the second vertical branch 513 are connected to the lower sides of the horizontal branch 511, the second short-circuit coupling branch 52 is located at the lower sides of the first vertical branch 512 and the second vertical branch 513, and the feed line 4 is connected to the middle position of the lower edge of the radiator 2. That is, the feed line 4 is connected to the side of the radiator 2 close to the second short-circuit coupling branch 52. The feeder line 4 is a strip-shaped metal patch which is arranged on the upper surface of the dielectric substrate 1 and extends vertically, and the vertical central axis of the feeder line 4 is positioned on the same straight line with the horizontal branch 511 and the vertical central axis of the second short circuit coupling branch 52. The impedance of the feed line 4 is 50 ohms, but this should not be taken as a limitation.

In summary, the parasitic resonator 5 is formed by slotting the radiator 2, the parasitic resonator 5 is formed by combining the first short-circuit coupling branch 51 in a substantially U shape and the second short-circuit coupling branch 52 in a substantially straight shape, and the current path is changed by slotting, so that the multi-frequency operation is realized. Moreover, the first short-circuit coupling branch 51 of the present invention is composed of a plurality of mutually connected

slotted branches

511 and 513 on the radiator 2, and the parasitic resonator 5 has compact structure and small volume; and the structure does not need to be additionally arranged on the basis of the original microstrip antenna, and the microstrip antenna has a simple structure and is easy to manufacture.

Referring to fig. 4 and 5, fig. 4 is a graph showing the change of the reflection coefficient of the antenna with frequency when the parasitic resonator 5 is not loaded in the prior art, and it can be known from fig. 4 that the simulated return loss of the antenna is below-10 dB only in the frequency range of 5.645-5.735GHz, and only single-frequency operation can be realized. Fig. 5 is a graph showing the variation of reflection coefficient with frequency of the multi-frequency microstrip antenna with a dual-microstrip resonant structure according to the present invention, and it can be known from fig. 5 that the simulated return loss of the antenna is below-10 dB in the frequency ranges of 5.099-5.226GH and 6.699-6.786GHZ, thereby realizing multi-frequency operation.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.

Claims

1. A multi-frequency microstrip antenna with dual microstrip resonance structure comprises a dielectric substrate, a radiator arranged on the upper surface of the dielectric substrate, a ground plate arranged on the lower surface of the dielectric substrate, and a feeder line connected with the radiator, characterized in that the radiator also comprises a parasitic resonator formed on the radiator, the parasitic resonator is a slot on the radiator, the short-circuit coupling branch structure comprises a first short-circuit coupling branch section and a second short-circuit coupling branch section which are arranged at intervals, wherein the first short-circuit coupling branch section is composed of a transverse branch, a first vertical branch and a second vertical branch which are connected to two ends of the same side of the transverse branch and are parallel to each other, the second short circuit coupling branch is in a strip shape extending along the transverse direction, and the second short circuit coupling branch is located on one side, away from the transverse branch, of the first vertical branch and the second vertical branch and is arranged opposite to the transverse branch.

2. The multi-frequency microstrip antenna of claim 1, wherein the second short-circuit coupling branch is located between vertical extensions of the first vertical branch and the second vertical branch.

3. The multiband microstrip antenna of claim 2, wherein the horizontal branch is formed at an upper position of the radiator, the first vertical branch and the second vertical branch are connected to lower sides of the horizontal branch, the second short-circuit coupling branch is located at lower sides of the first vertical branch and the second vertical branch, and the feeding line is connected to a middle position of a lower edge of the radiator.

4. The multi-frequency microstrip antenna according to claim 3, wherein the second short-circuit coupling stub, the transverse branch, the first vertical branch, and the second vertical branch are rectangular, the first vertical branch and the second vertical branch are perpendicular to the transverse branch, and the second short-circuit coupling stub is parallel to the transverse branch.

5. The multi-frequency microstrip antenna according to claim 4, wherein the parasitic resonator is symmetrically shaped about the central axis of the transverse branch in the vertical direction.

6. The multi-frequency microstrip antenna according to claim 4, wherein the transverse branches have a transverse dimension of 23mm and a vertical dimension of 2mm, the first and second vertical branches have a vertical dimension of 11mm and a transverse dimension of 1.5mm, and the second short-circuit coupling branches have a transverse dimension of 16mm and a vertical dimension of 2 mm.

7. The multi-frequency microstrip antenna according to claim 6, wherein the radiator is rectangular, the radiator has a lateral dimension of 37.26mm and a vertical dimension of 30.21mm, and the parasitic resonator is formed at a middle position of the radiator.

8. The multi-frequency microstrip antenna according to claim 4, wherein the feed line is an elongated metal patch provided on the upper surface of the dielectric substrate and extending in the vertical direction, and the feed line and the second short circuit coupling branch are located on the same straight line in the vertical central axis.

9. The multi-frequency microstrip antenna of claim 1 wherein the impedance of the feed line is 50 ohms.

10. The multi-frequency microstrip antenna according to claim 1, wherein the dielectric substrate is FR4 board with a thickness of 1.6mm and a dielectric constant of 4.3.