CN209963237U - Dual-polarized microstrip antenna and suction type antenna formed by same - Google Patents
Dual-polarized microstrip antenna and suction type antenna formed by same Download PDFInfo
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- CN209963237U CN209963237U CN201920993707.5U CN201920993707U CN209963237U CN 209963237 U CN209963237 U CN 209963237U CN 201920993707 U CN201920993707 U CN 201920993707U CN 209963237 U CN209963237 U CN 209963237U
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- 230000005404 monopole Effects 0.000 claims abstract description 50
- 239000000758 substrate Substances 0.000 claims abstract description 28
- 239000002775 capsule Substances 0.000 claims abstract description 25
- 230000009977 dual effect Effects 0.000 claims abstract description 15
- 230000005855 radiation Effects 0.000 claims abstract description 14
- 238000005452 bending Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 230000010287 polarization Effects 0.000 abstract description 18
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000002184 metal Substances 0.000 description 9
- 238000004088 simulation Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000002955 isolation Methods 0.000 description 5
- 239000000523 sample Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005388 cross polarization Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 210000001035 gastrointestinal tract Anatomy 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
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Abstract
The utility model relates to a microstrip antenna technical field. The utility model discloses a double polarization microstrip antenna and suction-type antenna that constitutes thereof. The utility model discloses a dual-polarized microstrip antenna, which comprises a first radiation unit on the top layer of a dielectric substrate and a second radiation unit on the bottom layer of the dielectric substrate; the first radiation unit is a monopole antenna, and the second radiation unit is a loop antenna; the monopole antenna and the loop antenna have symmetrical structures, and the symmetrical axes of the monopole antenna and the loop antenna are parallel to each other and are positioned on a plane vertical to the medium substrate. The utility model discloses a suction-type antenna curls by above-mentioned double polarization microstrip antenna and constitutes in the capsule. The beneficial effects of the utility model are that, have broadband and dual polarized antenna performance. The utility model discloses to be in annular antenna and monopole antenna on same medium base plate arrange the capsule in to constitute suction-type antenna with the capsule inner wall is conformal, can increase the inner space of capsule, so that hold more complicated microstrip antenna drive circuit.
Description
Technical Field
The utility model relates to a microstrip antenna technical field, in particular to a microstrip antenna for medical field particularly, relates to a dual polarization microstrip antenna and suction-type antenna who constitutes thereof.
Background
The microstrip antenna is formed by a radiating element formed on the top layer of a dielectric substrate 2. The radiating element may be a metal patch or a metal coating (i.e., a microstrip line) with different shapes, such as a common monopole antenna, which is formed by a rectangular microstrip line 1, as shown in fig. 1. The length L of the rectangular microstrip line determines the center frequency of the antenna, and the width H of the rectangular microstrip line is related to the bandwidth of the antenna. The monopole antenna feed port 4 is typically located at one end of a rectangular microstrip line. The underlying metal patch or metal coating of the dielectric substrate generally serves as the ground plane 3, as shown in fig. 2.
Another common microstrip antenna is a rectangular loop formed by microstrip lines 1, as shown in fig. 3 and referred to as a loop antenna. The length and width of the rectangle determine the center frequency of the antenna. Fig. 4 shows a circular microstrip antenna, the center frequency of which is determined by the radius R of the circular ring. The loop antenna typically has an opening 34 and the feed port 35 of the loop antenna is typically located at the opening 34 of the loop antenna.
Whether the monopole antenna or the loop antenna is adopted, various different deformations can be formed in different application environments, such as transformation of microstrip line width, bending of microstrip lines and the like, and antenna bandwidth, impedance and the like can be adjusted.
The microstrip antenna has wide application, can be semi-flexible or flexible according to different dielectric substrate characteristics, and can be conformal with a carrier so as to meet different application requirements. Microstrip antennas are used in medical systems, as well as in conventional communication devices, such as cellular phones.
Medical devices used inside the human body are mainly classified into implantable devices and inhalation devices. Implantable devices are typically fixed in a location within the body, while inhalation devices are constantly changing positions within the gastrointestinal tract of the body. The key elements of the antenna and the suction antenna are an implanted antenna and a suction antenna, and the suction antenna is also a capsule antenna.
In order to reduce the volume of the capsule antenna, microstrip antennas are usually used as the basis, and more types of antennas are available, such as helical antennas, planar inverted-F antennas, monopole antennas, slot antennas, loop antennas, and the like. The antenna profile includes two types, namely a planar antenna and a conformal antenna. From the polarization mode, the linear polarization mode is mainly used, and the circular polarization or dual polarization application is less. In addition, the capsule antenna faces a series of challenges such as biocompatibility, bandwidth, electromagnetic compatibility with other elements, specific absorption rate to the human body, and the like.
The main structure of the prior art slot antenna is linear polarization, and is not as robust as the circular polarization or dual polarization antenna for the change of the antenna position; the suction antenna in the prior art only emphasizes miniaturization, does not consider the influence of bandwidth on the antenna performance, and has narrower antenna bandwidth; the prior art generally adopts a microstrip antenna with a planar structure, cannot fully utilize the space of a carrier, and influences the improvement of the antenna performance.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a dual polarized microstrip antenna and a slot-in antenna comprising the same to solve the problem of the prior art slot-in antenna system that the direction is sensitive and the bandwidth is narrow.
In order to achieve the above object, according to an aspect of embodiments of the present invention, there is provided a dual-polarized microstrip antenna, including a first radiating element on a top layer of a dielectric substrate and a second radiating element on a bottom layer of the dielectric substrate;
the method is characterized in that:
the first radiation unit is a monopole antenna, and the second radiation unit is a loop antenna;
the monopole antenna and the loop antenna have symmetrical structures, and the symmetrical axes of the monopole antenna and the loop antenna are parallel to each other and are positioned on a plane vertical to the medium substrate.
In some embodiments, the feed port of the loop antenna and/or the feed port of the monopole antenna are disposed on the axis of symmetry.
In some embodiments, the feed port of the loop antenna and the feed port of the monopole antenna are located on the same side of the dielectric substrate.
In some embodiments, the loop antenna is a rectangular loop.
In certain embodiments, the rectangular ring has a bent structure.
In some embodiments, the monopole antenna is formed by connecting microstrip lines with different widths in series.
In some embodiments, the microstrip line furthest from the monopole antenna feed port has a bifurcated structure, each having the same or different length.
In order to achieve the above object, according to another aspect of the present invention, there is provided a slot antenna, comprising:
the double-polarized microstrip antenna is formed by rolling the double-polarized microstrip antenna in a capsule.
In some embodiments, the dual-polarized microstrip antenna is curled in a direction parallel or perpendicular to its axis of symmetry.
In certain embodiments, the capsule houses antenna drive circuitry.
The beneficial effects of the utility model are that, have broadband and dual polarized antenna performance. Further, a loop antenna with a non-uniform line width is used to realize a broadband characteristic, and the loop antenna is miniaturized by bending upper and lower sides thereof. Furthermore, the monopole antenna is optimized to widen the bandwidth. The utility model discloses to be in annular antenna and monopole antenna on same medium base plate arrange the capsule in to constitute suction-type antenna with the capsule inner wall is conformal, can increase the inner space of capsule, so that hold more complicated antenna drive circuit. Furthermore, the preferable curling mode parallel or vertical to the symmetry axis of the microstrip antenna is adopted, so that the influence on the antenna performance after curling can be greatly reduced.
The present invention will be further described with reference to the accompanying drawings and the detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and the detailed description, illustrative embodiments, and description of the invention are provided to explain the invention and not to constitute an undue limitation on the invention.
FIG. 1 is a schematic view of a monopole antenna structure;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a schematic diagram of a rectangular loop antenna structure;
FIG. 4 is a schematic diagram of a circular loop antenna;
FIG. 5 is a schematic diagram of an embodiment monopole antenna structure;
FIG. 6 is a cross-sectional view A-A of FIG. 5;
FIG. 7 is a schematic diagram of an embodiment of a loop antenna configuration;
FIG. 8 is a diagram illustrating return loss and isolation simulation results for a slot-in antenna system;
FIG. 9 is a schematic diagram of simulation results of monopole antenna excited two-dimensional far-field gain pattern at 2.45 GHz;
FIG. 10 is a diagram illustrating simulation results of a two-dimensional far-field gain pattern excited by a loop antenna at 2.45 GHz;
in the drawings:
1-microstrip line;
2-dielectric substrate;
3-bottom layer or ground plane;
4-metal probe;
11-first section microstrip line;
12-a second section of microstrip line;
13-third segment microstrip line;
31-a hollowed-out area;
32-a stepped structure;
33-bending structure;
34-opening of rectangular ring;
35-loop antenna feed port;
41-monopole antenna feed port top pad;
43-monopole antenna feed port bottom pad;
131-first bifurcation;
132-second bifurcation;
133-third bifurcation;
l is the microstrip line length;
h-microstrip line width;
t is the thickness of the dielectric substrate;
OO-the axis of symmetry of the loop antenna;
PP — symmetry axis of monopole antenna.
Detailed Description
It should be noted that the specific embodiments, examples and features thereof may be combined with each other in the present application without conflict. The present invention will now be described in detail with reference to the attached drawings in conjunction with the following.
In order to make the technical solution of the present invention better understood, the technical solution of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the specific implementation manner and the embodiments of the present invention, all other implementation manners and embodiments obtained by a person having ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
The utility model discloses a dual polarization microstrip antenna, including the first radiating element on dielectric substrate top layer with the second radiating element of dielectric substrate bottom.
The utility model discloses a two radiating element, first radiating element are monopole antenna, and the second radiating element is loop antenna. Because the monopole antenna is a horizontal polarization antenna and the loop antenna is a vertical polarization antenna, the layout structure of the dual-polarization antenna system is realized on one dielectric substrate.
The dual-polarized antenna system is beneficial to reducing the direction sensitivity of the antenna system, and is particularly suitable for special application occasions with uncertain direction and irregular direction change, such as a suction antenna and the like.
On the other hand, the dual-polarized antenna system can also increase the channel capacity and alleviate the multipath fading problem in communication.
The utility model discloses a monopole antenna and loop antenna all have symmetrical structure, and its symmetry axis is parallel to each other and is located with medium base plate vertically plane.
With this configuration, if the substrate thickness is neglected, the symmetry axes of the monopole and loop antennas can be considered to coincide. This provides increased isolation of the monopole and loop antennas and greatly reduces mutual interference, especially when the antenna is crimped.
Examples
The dual-polarized microstrip antenna structure of this example is composed of a first radiation unit on the top layer of the dielectric substrate 2 and a second radiation unit on the bottom layer of the dielectric substrate 2, as shown in fig. 5, 6 and 7. The dielectric substrate 2 was made of Rogers 6010, dielectric constant 10.2, and thickness t 0.254 mm.
The first radiating element in this example is a three-stage ladder monopole antenna formed by connecting microstrip lines 1 with different widths in series. The microstrip line 1 is divided into a first microstrip line 11, a second microstrip line 12 and a third microstrip line 13, as shown in fig. 5. In the figure, PP is the symmetry axis of the monopole antenna.
In this example, the first microstrip line 11 is thin and has a characteristic impedance of about 50 ohms for matching the feed impedance. The first microstrip line 11 ends with a top pad 41 of a monopole antenna feed port for connecting a metal probe 4, here also a feed port of a monopole antenna. The metal probe 4 functions to guide the feed port of the monopole antenna to the monopole antenna feed port bottom land 43 of the bottom layer of the dielectric substrate 2 and to introduce an excitation signal therefrom, as shown in fig. 7.
In this example, the second microstrip line 12, which is a transition section between the first microstrip line 11 and the third microstrip line 13, has an impedance matching function, and has a width greater than that of the first microstrip line 11 and smaller than that of the third microstrip line 13, as shown in fig. 5.
In this example, the third microstrip line 13 has a bifurcated structure, as shown in fig. 5, which is a first bifurcation 131, a second bifurcation 132 and a third bifurcation 133. The fork structure expands the bandwidth of the monopole antenna, in this example, each fork has a different length, as shown in fig. 5, the first fork 131 and the third fork 133 have the same length and width, and the second fork 132 has a smaller length than the first fork 131 and the third fork 133. The branches with different lengths have different resonant frequencies, so that a plurality of resonant points can be formed, and the bandwidth of the monopole antenna is further widened.
Referring to fig. 7, the loop antenna used in the dual-polarized microstrip antenna of this example is a rectangular loop.
In the loop antenna of the present embodiment, a rectangular opening is dug in the bottom layer 3 of the dielectric substrate 2, and the metal on the periphery is used as a reflection unit, so that the conductive area of the bottom layer 3 is kept as much as possible. The structure can use the conductive area of the bottom layer as the damaged ground plane of the top layer monopole antenna, and can effectively improve the impedance matching of the monopole antenna.
In order to reduce the size of the antenna and expand the bandwidth of the loop antenna, the short side of the rectangular loop in this example has a step structure 32, and the long side of the rectangular loop has a bending mechanism 33, as shown in fig. 7. In the figure, OO is the axis of symmetry of the loop antenna.
The opening 34 and the feed port 35 of the loop antenna of this example are both located on the axis of symmetry OO, as shown in fig. 7. The feed port of the monopole antenna is connected to the bottom pad 43 of the feed port of the monopole antenna at the center of the hollow area 31 of the bottom layer 3 through the metal probe 4, so that the feed ports of the monopole antenna at the top layer and the loop antenna at the bottom layer are both positioned at the bottom layer of the dielectric substrate, and the feed is convenient when the feed port is made into a capsule antenna after being curled.
As can be seen from fig. 5 and 7, the symmetry axis PP of the monopole antenna and the symmetry axis OO of the loop antenna are parallel to each other and lie on a plane perpendicular to the dielectric substrate, and if the thickness of the dielectric substrate 2 is ignored, the symmetry axis PP and the symmetry axis OO are the same straight line.
The dual-polarized microstrip antenna is curled in the capsule to form a suction antenna, and a microstrip antenna driving circuit can be arranged in the capsule.
The utility model discloses the direction of curling of dual polarization microstrip antenna recommended is parallel or perpendicular with antenna symmetry axis, can utilize the space of capsule by furthest to reduce the influence to the antenna performance after curling.
Simulation conclusion of suction antenna system in this example
Simulation environment:
the simulation model is 60 × 70mm3The dielectric constant of the rectangular parallelepiped human muscle tissue at 2.45GHz was 52.73, and the electrical conductivity was 1.74S/m. The capsule antenna is positioned at the center of the simulation model, and the long axis of the capsule is vertical to the yz plane of the rectangular coordinate system. The capsule antenna is attached to the inner wall of the capsule. The capsule consists of a cylinder with the length of 15mm, the inner radius of 5mm and the thickness of 0.5mm and two hemispherical capsule caps with the inner radius of 5mm and the thickness of 0.5mm which are positioned at two ends. The capsule was made of an acrylic material having a relative dielectric constant of 3 and a loss tangent of 0.001.
Fig. 8 shows the S-parameters of the antenna of this example, including the reflection coefficient and isolation. S11 is the reflection coefficient of the monopole antenna, and the-10 dB bandwidth of the monopole antenna can be seen to be 13 GHz (from 1.47 GHz to 14.48 GHz); s22 is the reflection coefficient of a loop antenna with a-10 dB bandwidth of about 13 GHz (from 2.19 GHz to 15 GHz). It can be seen that the dual-polarized antenna of the present example has a very wide bandwidth, much larger than the conventional dual-polarized antenna that has been reported. Further, the antenna has good isolation, and the isolation S21 is less than-50 dB in the required bandwidth, which is excellent in the slot antenna.
Fig. 9 shows radiation patterns of the XZ plane (phi 0deg) and the YZ plane (phi 90deg) at 2.45GHz of the antenna when the monopole antenna feed port is excited, and the main polarization is horizontal polarization. It can be seen from the figure that the antenna exhibits directional radiation characteristics along the normal at the resonant frequency, with cross-polarization levels below-30 dB.
Fig. 10 shows radiation patterns of an XZ plane (phi 0deg) and a YZ plane (phi 90deg) of the antenna at 2.45GHz when the feed port 35 is excited, and the polarization is mainly vertical. It can be seen from the figure that the antenna exhibits a two-way radiation characteristic at the resonant frequency, with cross-polarization levels below-30 dB.
Simulation experiment shows, the utility model discloses a dual polarization microstrip antenna is particularly suitable for being used for constituting suction-type antenna system, and the suction-type antenna each item performance that constitutes moreover all improves to some extent.
Claims (10)
1. A dual-polarized microstrip antenna comprises a first radiating element on the top layer of a dielectric substrate and a second radiating element on the bottom layer of the dielectric substrate;
the method is characterized in that:
the first radiation unit is a monopole antenna, and the second radiation unit is a loop antenna;
the monopole antenna and the loop antenna have symmetrical structures, and the symmetrical axes of the monopole antenna and the loop antenna are parallel to each other and are positioned on a plane vertical to the medium substrate.
2. A dual polarized microstrip antenna according to claim 1 wherein:
and the feed port of the loop antenna and/or the feed port of the monopole antenna are/is arranged on the symmetry axis.
3. A dual polarized microstrip antenna according to claim 1 wherein:
the feed port of the loop antenna and the feed port of the monopole antenna are positioned on the same side of the dielectric substrate.
4. A dual polarized microstrip antenna according to claim 1 wherein:
the loop antenna is a rectangular loop.
5. A dual polarized microstrip antenna according to claim 4 wherein:
the rectangular ring has a bending structure.
6. A dual polarized microstrip antenna according to any of claims 1 to 5 wherein:
the monopole antenna is formed by connecting microstrip lines with different widths in series.
7. A dual polarized microstrip antenna according to claim 6 wherein:
the microstrip line farthest from the monopole antenna feed port has a branching structure, and each branching length is the same or different.
8. A slot-in antenna, comprising:
the dual-polarized microstrip antenna is formed by rolling the dual-polarized microstrip antenna of any one of claims 1-7 in a capsule.
9. The slot antenna of claim 8, wherein:
the curling direction of the dual-polarized microstrip antenna is parallel to or perpendicular to the symmetry axis of the dual-polarized microstrip antenna.
10. The slot antenna of claim 8, wherein:
the capsule is internally provided with an antenna driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920993707.5U CN209963237U (en) | 2019-06-28 | 2019-06-28 | Dual-polarized microstrip antenna and suction type antenna formed by same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920993707.5U CN209963237U (en) | 2019-06-28 | 2019-06-28 | Dual-polarized microstrip antenna and suction type antenna formed by same |
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| CN209963237U true CN209963237U (en) | 2020-01-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350298A (en) * | 2019-06-28 | 2019-10-18 | 成都信息工程大学 | A kind of suction-type antenna of double polarized micro strip antenna and its composition |
| CN114824804A (en) * | 2021-01-28 | 2022-07-29 | 京东方科技集团股份有限公司 | Antenna and preparation method thereof |
-
2019
- 2019-06-28 CN CN201920993707.5U patent/CN209963237U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350298A (en) * | 2019-06-28 | 2019-10-18 | 成都信息工程大学 | A kind of suction-type antenna of double polarized micro strip antenna and its composition |
| CN110350298B (en) * | 2019-06-28 | 2024-06-07 | 成都信息工程大学 | Dual-polarized microstrip antenna and suction antenna formed by same |
| CN114824804A (en) * | 2021-01-28 | 2022-07-29 | 京东方科技集团股份有限公司 | Antenna and preparation method thereof |
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Granted publication date: 20200117 |