CN215732212U - Multi-frequency microstrip antenna with mountain-shaped microstrip resonance structure - Google Patents
Multi-frequency microstrip antenna with mountain-shaped microstrip resonance structure Download PDFInfo
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- CN215732212U CN215732212U CN202121451810.0U CN202121451810U CN215732212U CN 215732212 U CN215732212 U CN 215732212U CN 202121451810 U CN202121451810 U CN 202121451810U CN 215732212 U CN215732212 U CN 215732212U
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Abstract
The utility model discloses a multi-frequency microstrip antenna with a mountain-shaped microstrip resonance structure, which comprises a dielectric substrate, a radiator, a ground plate, a feeder line and a parasitic resonator. The parasitic resonator is a slot which is formed on the radiator and approximately takes the shape of a Chinese character 'shan', and consists of a transverse branch, a first vertical branch, a second vertical branch and a third vertical branch which are connected to the same side of the transverse branch and are parallel to each other. The first vertical branch and the second vertical branch are connected to two ends of the transverse branch, and the third vertical branch is positioned between the first vertical branch and the second vertical branch. The sizes of the first vertical branch and the second vertical branch in the vertical direction are equal, and the size of the third vertical branch in the vertical direction is larger than the sizes of the first vertical branch and the second vertical branch in the vertical direction. 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
Technical Field
The utility model relates to the technical field of communication antenna design, in particular to a multi-frequency microstrip antenna with a mountain-shaped 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 mountain-shaped microstrip resonance structure, which is simple in structure and small in size.
In order to achieve the above object, the multi-frequency microstrip antenna having a mountain-shaped 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 consists of a transverse branch, a first vertical branch, a second vertical branch and a third vertical branch, wherein the first vertical branch, the second vertical branch and the third vertical branch are connected to the same side of the transverse branch and are parallel to each other. The first vertical branch and the second vertical branch are connected to two ends of the transverse branch, and the third vertical branch is located between the first vertical branch and the second vertical branch. The size of the third vertical branch in the vertical direction is larger than that of the first vertical branch and that of the second vertical branch in the vertical direction.
Compared with the prior art, the utility model realizes multi-frequency work by forming the parasitic resonator approximately in the shape of a Chinese character 'shan' on the radiating body, the Chinese character 'shan' can be seen as two U-shaped slots which are connected together in parallel, the current path is changed by the two U-shaped slots, two relatively independent current loops are formed, and the bandwidth of the antenna at two working frequency bands is widened by the coupling of the two current loops. In addition, the parasitic resonator of the utility model is composed of 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.
Specifically, the horizontal branch is formed at a lower position of the radiator, the first vertical branch, the second vertical branch, and the third vertical branch are connected to an upper side of the horizontal branch, and the feed line is connected to a middle position of a lower edge of the radiator.
Specifically, the transverse branch, the first vertical branch, the second vertical branch and the third vertical branch are all rectangular, and the first vertical branch, the second vertical branch and the third vertical branch are perpendicular to the transverse branch.
Specifically, the parasitic resonator takes the central axis of the third vertical branch in the vertical direction as a symmetry axis and is in a symmetrical shape.
Specifically, the transverse size of the transverse branch is 20mm, the vertical size of the transverse branch is 2mm, the vertical size of the first vertical branch and the second vertical branch is 11mm, the transverse size of the first vertical branch and the second vertical branch is 2mm, the vertical size of the third vertical branch is 18mm, and the transverse size of the third vertical 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 vertical central axis of the feeder line and the vertical central axis of the third vertical branch are located on the same straight line.
Specifically, the radiator is located at a middle upper position of the upper surface of the dielectric substrate, and the ground plate is fully distributed on the lower surface of the dielectric substrate.
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 mountain-shaped 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 mountain-shaped 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 the multi-frequency microstrip antenna having the mountain-shaped microstrip resonance structure according to the embodiment of the present invention, as a function of frequency.
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 having a mountain-shaped 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 is substantially in a shape of a Chinese character "shan", and is composed of a transverse branch 51, and a first vertical branch 52, a second vertical branch 53, and a third vertical branch 54 which are connected to the same side of the transverse branch 51 and are parallel to each other. The first vertical branch 52 and the second vertical branch 53 are connected to two ends of the transverse branch 51, and the third vertical branch 54 is located between the first vertical branch 52 and the second vertical branch 53. The first vertical branch 52 and the second vertical branch 53 have the same size in the vertical direction, and the third vertical branch 54 has a larger size in the vertical direction than the first vertical branch 52 and the second vertical branch 53.
In the embodiment shown in fig. 1 and 3, the transverse branch 51, the first vertical branch 52, the second vertical branch 53 and the third vertical branch 54 are all rectangular, the first vertical branch 52, the second vertical branch 53 and the third vertical branch 54 are all perpendicular to the transverse branch 51, and the third vertical branch 54 is connected to the middle position of the transverse branch 51. Further, the parasitic resonator 5 is in a left-right symmetrical shape (taking the angle shown in fig. 3 as an example) with the central axis of the third vertical branch 54 in the vertical direction as a symmetry axis, and the parasitic resonator 5 is regular in shape and easy to manufacture.
As a preferred embodiment, the transverse branch 51 has a transverse dimension of 20mm and a vertical dimension of 2 mm; the vertical sizes of the first vertical branch 52 and the second vertical branch 53 are 11mm, and the transverse size is 2 mm; the third vertical branch 54 has a vertical dimension of 18mm and a transverse dimension of 2mm, and the third vertical branch 54 is spaced apart from the first vertical branch 52 and the second vertical branch 53 by 7 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 size of each branch 51-54 of the parasitic resonator 5 can be adjusted adaptively according to specific requirements, and is not limited to the size illustrated in the embodiment, the shape of the radiator 2 and the ground plate 3 is not limited to a rectangle, and in a specific implementation, microstrip antenna designs with different radiation characteristics can be implemented by changing the geometry 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 51 is formed at the lower position of the radiator 2, the first vertical branch 52, the second vertical branch 53, and the third vertical branch 54 are connected to the upper side of the horizontal branch 51, and the feeding line 4 is connected to the middle position of the lower edge of the radiator 2. I.e. the feed line 4 is connected to the side of the radiator 2 close to the transverse branch 51. 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 and the vertical central axis of the third vertical branch 54 are positioned on the same straight line. The impedance of the feed line 4 is 50 ohms, but this should not be taken as a limitation.
In summary, the radiating body 2 is provided with the slots to form the parasitic resonators 5 in a shape like a Chinese character 'shan', the Chinese character 'shan' can be regarded as two U-shaped slots which are connected together in parallel, the current paths are changed through the two U-shaped slots to form two relatively independent current loops, and the bandwidth of the antenna in two working frequency bands is widened by the coupling of the two current loops; meanwhile, adverse factors of a single current loop can be offset, and radiation influence of the antenna on a human body is reduced. Moreover, the parasitic resonator 5 of the present invention is composed of a plurality of interconnected slotted branches 51-54 on the radiator 2, 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.
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 having the mountain-shaped microstrip resonance 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 5.092-5.234GHZ and 6.717-6.807GHZ, 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 (10)
1. A multi-frequency microstrip antenna with mountain-shaped 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, which consists of a transverse branch, a first vertical branch, a second vertical branch and a third vertical branch which are connected with the same side of the transverse branch and are parallel to each other, the first vertical branch and the second vertical branch are connected with the two ends of the transverse branch, the third vertical branch is positioned between the first vertical branch and the second vertical branch, the size of the third vertical branch in the vertical direction is larger than that of the first vertical branch and that of the second vertical branch in the vertical direction.
2. The multiband microstrip antenna of claim 1, wherein the horizontal branch is formed at a lower position of the radiator, the first vertical branch, the second vertical branch, and the third vertical branch are connected to upper sides of the horizontal branch, and the feeding line is connected to a middle position of a lower edge of the radiator.
3. The multi-frequency microstrip antenna according to claim 2, wherein the transverse branch, the first vertical branch, the second vertical branch, and the third vertical branch are rectangular, and the first vertical branch, the second vertical branch, and the third vertical branch are perpendicular to the transverse branch.
4. The multi-frequency microstrip antenna of claim 3, wherein the parasitic resonator is symmetrically shaped about a central vertical axis of the third vertical branch.
5. The multi-frequency microstrip antenna according to claim 3, wherein the transverse branches have a transverse dimension of 20mm and a vertical dimension of 2mm, the first and second vertical branches have a vertical dimension of 11mm and a transverse dimension of 2mm, and the third vertical branch has a vertical dimension of 18mm and a transverse dimension of 2 mm.
6. The multi-frequency microstrip antenna according to claim 5, 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.
7. The multi-frequency microstrip antenna according to claim 3, 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 central axis of the feed line in the vertical direction is aligned with the central axis of the third vertical branch in the vertical direction.
8. The multi-frequency microstrip antenna of claim 2, wherein the radiator is located at a middle upper position of the upper surface of the dielectric substrate, and the ground plane is disposed over the lower surface of the dielectric substrate.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121451810.0U CN215732212U (en) | 2021-06-28 | 2021-06-28 | Multi-frequency microstrip antenna with mountain-shaped microstrip resonance structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121451810.0U CN215732212U (en) | 2021-06-28 | 2021-06-28 | Multi-frequency microstrip antenna with mountain-shaped microstrip resonance structure |
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| CN215732212U true CN215732212U (en) | 2022-02-01 |
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| CN202121451810.0U Withdrawn - After Issue CN215732212U (en) | 2021-06-28 | 2021-06-28 | Multi-frequency microstrip antenna with mountain-shaped microstrip resonance structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422208A (en) * | 2021-06-28 | 2021-09-21 | 东莞理工学院 | Multi-frequency microstrip antenna with mountain-shaped microstrip resonance structure |
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2021
- 2021-06-28 CN CN202121451810.0U patent/CN215732212U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422208A (en) * | 2021-06-28 | 2021-09-21 | 东莞理工学院 | Multi-frequency microstrip antenna with mountain-shaped microstrip resonance structure |
| CN113422208B (en) * | 2021-06-28 | 2024-07-12 | 东莞理工学院 | Multifrequency microstrip antenna with mountain-type microstrip resonance structure |
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Granted publication date: 20220201 Effective date of abandoning: 20240712 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20220201 Effective date of abandoning: 20240712 |