CN111009726A - Multi-frequency band antenna - Google Patents
Multi-frequency band antenna Download PDFInfo
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- CN111009726A CN111009726A CN201911424503.0A CN201911424503A CN111009726A CN 111009726 A CN111009726 A CN 111009726A CN 201911424503 A CN201911424503 A CN 201911424503A CN 111009726 A CN111009726 A CN 111009726A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
- H01Q5/28—Arrangements for establishing polarisation or beam width over two or more different wavebands
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0414—Substantially flat resonant element parallel to ground plane, e.g. patch antenna in a stacked or folded configuration
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Abstract
The invention discloses a multi-band antenna, which comprises N micro-strip antennas which are arranged in an up-down laminated manner, wherein each micro-strip antenna is provided with a working frequency band, and the interval of the working frequency bands of the adjacent micro-strip antennas is larger than a set threshold value. According to the invention, each microstrip antenna has a respective working frequency band, and the interval of the working frequency bands of the adjacent microstrip antennas is larger than a set threshold value, so that the decoupling of the antennas is realized, the isolation between different frequency bands is improved, the compact design of the laminated antenna is realized, and the volume of the multi-band antenna is reduced.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a multi-band antenna.
Background
In recent years, microstrip antennas have been widely used due to their advantages of light weight, low cost, compact structure, and easy conformality. However, the weak points of the microstrip antenna are that the frequency band is narrow and the gain is low, so that how to break through the bandwidth limitation and improve the gain of the microstrip antenna has become one of the main research subjects of the microstrip antenna.
The single-layer microstrip antenna is mainly applied to satellite systems and communication systems. The laminated microstrip antenna can effectively expand the bandwidth, and because the structure of the antenna is complex, the manufacture of a representative multiband antenna comprising the laminated microstrip antenna is difficult at present, and the miniaturization of the multiband antenna is a difficult point of design considering that the multiband antenna has multiple frequency bands, wide frequency bands and strong coupling.
Disclosure of Invention
The embodiment of the invention provides a multi-band antenna, which is used for solving the problem of realizing the multi-band antenna comprising a multi-layer microstrip antenna.
In a first aspect, an embodiment of the present invention provides a multiband antenna, including N microstrip antennas stacked one above another; each microstrip antenna has a respective working frequency band, and the interval of the working frequency bands of the adjacent microstrip antennas is larger than a set threshold value.
According to the scheme, due to the fact that the antenna has multiple frequency bands, wide frequency bands and strong coupling, each microstrip antenna has the corresponding working frequency band, and the interval of the working frequency bands of the adjacent microstrip antennas is larger than a set threshold value.
Optionally, the N microstrip antennas are a first microstrip antenna and an nth microstrip antenna … … from top to bottom in sequence, where N is an integer greater than 3;
the multi-band antenna further comprises a plurality of short circuit pins which are positioned at a set distance from the center point of the multi-band antenna; the short circuit pin is positioned in a medium substrate of each microstrip antenna from the Mth microstrip antenna to the Nth microstrip antenna; the short circuit pin is used for communicating the radiation surfaces of the microstrip antennas from the Mth microstrip antenna to the Nth microstrip antenna; m is an integer greater than 3 and less than N.
It should be noted that, through the design of the short circuit pin, the zero potential area of the antenna is enlarged, and the stray current is eliminated, so that the number of layers of the microstrip antenna included in the multiband antenna can be larger than 3.
Optionally, the plurality of shorting pins form a circle centered on a center point of the multiband antenna.
The plurality of shorting pins may be rectangular, triangular, or the like.
Optionally, the areas of the radiation surfaces of the N microstrip antennas are sequentially increased from top to bottom, and the center points of the N microstrip antennas are the same.
The area of each radiating surface of the N microstrip antennas may be the largest radiating surface located in the middle of the antennas.
Optionally, the set distance is greater than a distance from a feed point of any one of the first to M-1 th microstrip antennas to the central point.
It should be noted that the antenna can be decoupled only when the fixed distance is greater than the distance from the feed point of any one of the M-1 th microstrip antenna to the center point from the first microstrip antenna. It is also well understood that, because the spatial region enclosed by the plurality of short-circuit pins forms the zero-point region of the antenna, that is, the radiation surface of the upper layer microstrip antenna and the radiation surface of the lower layer microstrip antenna are short-circuited in the region enclosed by the feed points, the feed point of the upper layer microstrip antenna has no influence on the lower layer microstrip antenna, and the isolation between the antennas in different frequency bands is improved.
Optionally, the working frequency bands of the N microstrip antennas from top to bottom are B1, S, L, B3, and B2, or L, S, B1, B3, and B2 in sequence;
it should be noted that, B1, S, L, B3, and B2 are five frequency bands of the third generation beidou satellite navigation system.
According to the scheme, a lamination mode of L, S, B1, B3 and B2 or a lamination mode of B1, B S, L, B3 and B2 is adopted, L is left-hand circular polarization, and B1 is right-hand circular polarization, so that although the frequency bands are close, a broadband antenna cannot be made, the broadband antenna can only be separated, and S is used for separating L from B1, so that the isolation of the antenna is improved, and the multi-microstrip design is realized.
Optionally, the dielectric constant of the dielectric substrate of the first microstrip antenna is a high dielectric constant, and the dielectric substrates of the other microstrip antennas all adopt a low dielectric constant.
According to the scheme, the dielectric constant corresponds to a narrower bandwidth of a B1 frequency band, and the interference of an adjacent frequency band L is favorably reduced.
Optionally, the first microstrip antenna adopts a center point feed manner; the second microstrip antenna adopts an eccentric feed mode; the third microstrip antenna, the fourth microstrip antenna and the fifth microstrip antenna all adopt a center type feed mode.
It should be noted that the center point feeding manner adopted by the first microstrip antenna makes the first microstrip antenna feeding point not affect the lower layer microstrip antenna.
Optionally, a distance from the feed point of the kth microstrip antenna to the center point of the multiband antenna is less than a distance from the feed point of the K +1 th microstrip antenna to the center point of the multiband antenna.
Optionally, the radiation surface of the first microstrip antenna is a square with a side length of 29.5 mm; the dielectric constant of the dielectric substrate of the first microstrip antenna is 10, and the thickness of the dielectric substrate of the first microstrip antenna is 3.5 mm; the feed point of the first microstrip antenna is the central point;
the radiation surface of the second microstrip antenna is a square with the side length of 61.5 mm; the dielectric constant of the dielectric substrate of the third microstrip antenna is 2.2, and the thickness of the dielectric substrate of the third microstrip antenna is 2 mm; the distance between the feed point of the first microstrip antenna and the central point is 8.5 mm;
the radiation surface of the third microstrip antenna is a rectangle with the length of 39mm and the width of 37.5 mm; the dielectric constant of the dielectric substrate of the second microstrip antenna is 2.2, and the thickness of the dielectric substrate of the second microstrip antenna is 2 mm; the distance between the feed point of the third microstrip antenna and the central point is 15 mm;
the radiation surface of the fourth microstrip antenna is a square with the side length of 82 mm; the dielectric constant of the dielectric substrate of the fourth microstrip antenna is 3, and the thickness of the dielectric substrate of the fourth microstrip antenna is 2 mm; the distance between the feed point of the fourth microstrip antenna and the central point is 29 mm;
the radiation surface of the fifth microstrip antenna is a square with the side length of 95 mm; the dielectric constant of the dielectric substrate of the fifth microstrip antenna is 2.2, and the thickness of the dielectric substrate of the fifth microstrip antenna is 3.5 mm; and the distance between the feed point of the fifth microstrip antenna and the central point is 30 mm.
It should be noted that the selection of the dielectric constant of the dielectric substrate, the size of the dielectric substrate, and the selection of the feeding manner all greatly affect the performance of the multiband antenna.
In a second aspect, an embodiment of the present invention provides a terminal device, including the multiband antenna described in the first aspect.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a microstrip antenna according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a multiband antenna according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an isolation curve of a multiband antenna according to an embodiment of the present invention.
Detailed Description
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present invention, and are not limitations of the technical solutions of the present invention, and the technical features of the embodiments and examples of the present invention may be combined with each other without conflict.
First, the multiband antenna provided by the embodiment of the present invention includes N microstrip antennas stacked up and down. In order to better explain the embodiments of the present invention, the composition and radiation principle of the microstrip antenna will be briefly described below.
As shown in fig. 1, the single-layer microstrip antenna is composed of a radiating patch, a dielectric substrate and a ground plate. The microstrip antenna comprises a radiation patch, a dielectric substrate and a ground plate from top to bottom in sequence. The radiation patch may be copper, gold, etc., and the radiation patch is a radiation source for electromagnetic waves radiating to the space, and it may be in any shape. Further, the radiation of the microstrip antenna is generated by the fringing fields between the edges of the microstrip antenna conductor and the floor.
From the above, it can be seen that the most basic microstrip antenna is a single-layer structure, and the microstrip antenna has the advantages of compact structure, easy conformality, and the like, and based on this, to solve the problems existing in the prior art, the embodiment of the present application provides a multiband antenna including N microstrip antennas stacked up and down on the basis of the single-layer structure, which is specifically as follows:
a multiband antenna as shown in fig. 2, comprising: n microstrip antennas are stacked up and down, wherein the radiation surface of the lower microstrip antenna is the ground surface of the upper microstrip antenna; each microstrip antenna has a respective working frequency band, and the interval of the working frequency bands of the adjacent microstrip antennas is larger than a set threshold value.
In the embodiment of the application, the simplest form of the laminated microstrip antenna is that a single-layer microstrip antenna is covered by a layer of medium, and the common form is that two layers of overlapped mediums are respectively provided with a radiating patch.
Based on the above, the multi-layer medium has different thicknesses and dielectric constants, and the plurality of radiation patches also have different sizes, shapes, and different excitation methods.
Further, in the embodiment of the present application, feeding manners such as coaxial feeding and microstrip feeding are adopted, which is not specifically limited in the embodiment of the present application. In the embodiment of the present application, patches with regular shapes, such as rectangular patches, circular patches, or triangular patches, are selected, which is not limited specifically. In addition, the bandwidth and the gain of the antenna can be changed by adjusting the dielectric thickness of the dielectric substrate, the size of the radiating patch and the positions of the upper patch and the lower patch.
In the embodiment of the application, because the antenna has multiple frequency bands, wide frequency bands and strong coupling, each microstrip antenna has a respective working frequency band, and the interval of the working frequency bands of the adjacent microstrip antennas is greater than a set threshold value.
Specifically, the N microstrip antennas are a first microstrip antenna and a second microstrip antenna … …, which are sequentially arranged from top to bottom, where N is an integer greater than 3.
It should be noted that, when a laminated antenna is designed, the design difficulty increases by one order every time a layer is added, and particularly, the design difficulty increases on the basis of three layers. For example, the M-1 metallized through holes are arranged on the Mth microstrip antenna, and the greater the number is, the greater the difficulty is.
Furthermore, the multi-band antenna also comprises a plurality of short circuit pins which are positioned at a set distance from the central point of the multi-band antenna; the short circuit pin is positioned in the medium base body of each microstrip antenna from the Mth microstrip antenna to the Nth microstrip antenna; the short circuit pin is used for communicating the radiation surface of each microstrip antenna from the Mth microstrip antenna to the Nth microstrip antenna with the ground surface; m is an integer greater than 3 and less than N.
Specifically, the plurality of short circuit pins form a circle centered on a center point of the multiband antenna.
As a specific example, as shown in fig. 2, the plurality of shorting pins are circular with the center point of the multiband antenna as the center. In addition, the shape formed by the plurality of shorting pins may also be rectangular, triangular, etc., which is not specifically limited in this application.
According to the scheme, through the design of the short circuit pin, the zero potential area of the antenna is enlarged, and stray current is eliminated, so that the number of layers of the microstrip antenna included in the multi-band antenna can be larger than 3.
In the embodiment of the application, the areas of the radiation surfaces of the N microstrip antennas are sequentially increased from top to bottom, and the central points of the N microstrip antennas are the same.
It should be noted that the area of each radiation surface of the N microstrip antennas may also be the largest radiation surface area located in the middle of the antenna, and this is not specifically limited in this embodiment of the application.
In addition, the set distance is larger than the distance from the feed point of any one of the M-1 th microstrip antenna to the first microstrip antenna to the central point.
As can be seen from the above, the antenna can be decoupled only when the fixed distance is greater than the distance from the feed point of any one of the M-1 th microstrip antenna to the center point from the first microstrip antenna. It is also well understood that, because the spatial region enclosed by the plurality of short-circuit pins forms the zero-point region of the antenna, that is, the radiation surface of the upper layer microstrip antenna and the radiation surface of the lower layer microstrip antenna are short-circuited in the region enclosed by the feed points, the feed point of the upper layer microstrip antenna has no influence on the lower layer microstrip antenna, and the isolation between the antennas in different frequency bands is improved.
Furthermore, the distance from the feed point of the Kth microstrip antenna to the center point of the multiband antenna is less than the distance from the feed point of the K +1 th microstrip antenna to the center point of the multiband antenna.
By the scheme, decoupling of the multi-band antenna is further realized.
The design principle of the multiband antenna provided by the embodiment of the invention is further explained according to a specific example.
As shown in fig. 2, based on the above, the number N of the microstrip antennas is 5, and the operating frequency bands of the N microstrip antennas from top to bottom are B1, S, L, B3, and B2, or L, S, B1, B3, and B2;
it should be noted that, B1, S, L, B3, and B2 are five frequency bands of the third generation beidou satellite navigation system. The third generation of Beidou is a global-coverage satellite navigation system evolved on a first generation Beidou satellite navigation test system and a second generation Beidou regional navigation system covering the Asia-Pacific region, the frequency bands of the third generation of Beidou are greatly widened on the basis of being compatible with the second generation working frequency bands, and the frequency bands can be generally B1(B1I/B1A/B1C), B3(B3AE/B3A/B3I/B3Q), B2(B2a/B2B), S (S1I/S1Q/S2C _ d/S2C _ p/S2A) and L (Lf-0/Lf1/Lf2/Lf3/Lf4/Lf 5).
Generally, in the design of a multiband antenna, five microstrip antennas respectively working at S, L, B1, B3 and B2 are sequentially arranged from top to bottom according to the resonance wavelength relationship, in the embodiment of the application, because the frequency bands of L and B1 are close and the polarizations are opposite, according to the arrangement, a large coupling current is directly induced on a B1 radiating plate when an L radiating plate works, and meanwhile, L is responsible for transmitting, has large power and can directly influence a receiver positioned at the rear end of the antenna.
Based on this, the proposal of the application adopts L, S, B1, B3 and B2 lamination mode, or B1, S, L, B3 and B2 lamination mode, and separates L and B1 by S, thereby improving the isolation of the antenna and realizing the design of multiple micro-strips.
It should be noted that, there is a premise in realizing the design manner that B1, S, L, B3, and B2 are sequentially arranged from top to bottom, and based on the fact that dielectric substrates with different dielectric constants produce different degrees of dielectric shortening effects on the radiation sheet, the S radiation sheet is larger than B1, the L radiation sheet is larger than S, and the areas of the radiation sheets sequentially increase.
In the embodiment of the present application, the dielectric constant of the dielectric substrate of the first microstrip antenna is a high dielectric constant, and the dielectric substrates of the other microstrip antennas all adopt a low dielectric constant.
It should be noted that, in the design of the antenna, the selection of the dielectric constant of the dielectric substrate, the size of the dielectric substrate, and the selection of the feeding mode all affect the performance of the multiband antenna to a great extent, and the specific design of the multiband antenna provided by the embodiment of the present invention is specifically described below:
the radiation surface of the first microstrip antenna is a square with the side length of 29.5mm, the dielectric constant of the dielectric substrate of the first microstrip antenna is 10, the thickness of the dielectric substrate of the first microstrip antenna is 3.5mm, the high dielectric constant corresponds to the narrower bandwidth of the B1 frequency band, and the interference of the adjacent frequency band L is favorably reduced.
In the feeding mode, the feeding point of the first microstrip antenna is the central point, that is, the microstrip antenna B1 adopts the central point feeding mode, so that the metalized via holes which are positioned on the microstrip antennas S and L and through which the feed pins pass are positioned in the zero potential area, and thus, the current mode of the radiation piece of the microstrip antenna with the frequency bands of S and L is not influenced.
The radiation surface of the second microstrip antenna is a square with the side length of 61.5mm, the dielectric constant of the dielectric substrate of the second microstrip antenna is 2.2, the thickness of the dielectric substrate of the second microstrip antenna is 2mm, the low dielectric constant is beneficial to enlarging the area of an S frequency band, and the bandwidth and the radiation efficiency of the second microstrip antenna are increased.
In the feed mode, the second microstrip antenna adopts an eccentric feed mode, the radiation piece is set to be rectangular, and the feed point is positioned on the diagonal line. The distance from the feed point of the second microstrip antenna to the center point is 8.5 mm.
The radiation surface of the third microstrip antenna is a rectangle with the length of 39mm and the width of 37.5mm, the dielectric constant of the dielectric substrate of the third microstrip antenna is 2.2, the thickness of the dielectric substrate is 2mm, the bandwidth can be expanded by adopting the design of low dielectric constant, meanwhile, the radiation piece can also be designed by adopting the meander technology, and the side length of the current path is beneficial to the miniaturization of the antenna.
In the feeding mode, the third microstrip antenna adopts a center feeding mode, and the distance from the feeding point of the third microstrip antenna to the central point is 15 mm.
Based on the above contents, a circle of short circuit pins are arranged on the medium substrate, so that a zero potential area is enlarged, and coupling current generated when feed pins of the microstrip antenna with frequency bands of B1 and S, L penetrate through the feed pins is eliminated.
In the feeding mode, the fourth microstrip antenna adopts a center feeding mode, and the distance between a feeding point of the fourth microstrip antenna and the central point is 29 mm.
The radiation surface of the fifth microstrip antenna is a square with the side length of 95mm, the dielectric constant of a medium substrate of the fifth microstrip antenna is 2.2, the thickness of the medium substrate of the fifth microstrip antenna is 3.5mm, and meanwhile, a circle of short circuit pins are arranged, so that a zero potential area is enlarged, stray current is eliminated, and the circular polarization performance with higher purity is realized.
In the feeding mode, the fifth microstrip antenna adopts a center feeding mode, and the distance from the feeding point of the fifth microstrip antenna to the central point is 30 mm.
Based on the above, fig. 3 is an isolation curve of a multiband antenna according to an embodiment of the present invention.
As shown in fig. 3, the horizontal axis represents frequency, and the vertical axis represents isolation between antennas in different frequency bands. It can be seen from the figure that, for example, a bold curve, for each point on the curve, the larger the absolute value of the ordinate, the better the isolation.
Based on the same technical concept, the embodiment of the invention also provides a terminal device, and the terminal device can comprise the multi-band antenna.
Finally, it should be noted that: as will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, controlled devices (systems) and computer program products according to the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing controlled apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing controlled apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A multi-band antenna is characterized by comprising N micro-strip antennas which are arranged in an up-down laminated manner; each microstrip antenna has a respective working frequency band, and the interval of the working frequency bands of the adjacent microstrip antennas is larger than a set threshold value.
2. The multiband antenna of claim 1, wherein the N microstrip antennas are, in order from top to bottom, a first microstrip antenna, a second microstrip antenna … … an nth microstrip antenna, where N is an integer greater than 3;
the multi-band antenna further comprises a plurality of short circuit pins which are positioned at a set distance from the center point of the multi-band antenna; the short circuit pin is positioned in a medium substrate of each microstrip antenna from the Mth microstrip antenna to the Nth microstrip antenna; the short circuit pin is used for communicating the radiation surfaces of the microstrip antennas from the Mth microstrip antenna to the Nth microstrip antenna; m is an integer greater than 3 and less than N.
3. The multiband antenna of claim 2, wherein the plurality of shorting pins form a circle centered on a center point of the multiband antenna.
4. The multiband antenna of any one of claims 1 to 3, wherein the areas of the radiation surfaces of the N microstrip antennas increase sequentially from top to bottom, and the center points of the N microstrip antennas are the same.
5. The multiband antenna of claim 4, wherein the set distance is greater than a distance from a feeding point of any one of the first to M-1 th microstrip antennas to the center point.
6. The multiband antenna of claim 4, wherein the operating bands of the N microstrip antennas are, in order from top to bottom, B1, S, L, B3, B2, or L, S, B1, B3, B2; the satellite navigation system comprises a Beidou third generation satellite navigation system, a satellite navigation system and a satellite navigation system, wherein B1, S, L, B3 and B2 are five frequency bands of the Beidou third generation satellite navigation system.
7. The multiband antenna of claim 6, wherein the dielectric substrate of the first microstrip antenna has a high dielectric constant, and the dielectric substrates of the remaining microstrip antennas have low dielectric constants.
8. The multiband antenna of claim 6, wherein the first microstrip antenna employs a center-point feed; the second microstrip antenna adopts an eccentric feed mode; the third microstrip antenna, the fourth microstrip antenna and the fifth microstrip antenna all adopt a center type feed mode.
9. The multiband antenna of claim 8, wherein a distance of a feeding point of a kth microstrip antenna from a center point of the multiband antenna is smaller than a distance of a feeding point of a K +1 th microstrip antenna from a center point of the multiband antenna.
10. The multiband antenna of claim 9, wherein the radiating surface of the first microstrip antenna is a square with a side length of 29.5 mm; the dielectric constant of the dielectric substrate of the first microstrip antenna is 10, and the thickness of the dielectric substrate of the first microstrip antenna is 3.5 mm; the feed point of the first microstrip antenna is the central point;
the radiation surface of the second microstrip antenna is a square with the side length of 61.5 mm; the dielectric constant of the dielectric substrate of the second microstrip antenna is 2.2, and the thickness of the dielectric substrate of the second microstrip antenna is 2 mm; the distance between the feed point of the second microstrip antenna and the central point is 8.5 mm;
the radiation surface of the third microstrip antenna is a rectangle with the length of 39mm and the width of 37.5 mm; the dielectric constant of the dielectric substrate of the third microstrip antenna is 2.2, and the thickness of the dielectric substrate of the third microstrip antenna is 2 mm; the distance between the feed point of the third microstrip antenna and the central point is 15 mm;
the radiation surface of the fourth microstrip antenna is a square with the side length of 82 mm; the dielectric constant of the dielectric substrate of the fourth microstrip antenna is 3, and the thickness of the dielectric substrate of the fourth microstrip antenna is 2 mm; the distance between the feed point of the fourth microstrip antenna and the central point is 29 mm;
the radiation surface of the fifth microstrip antenna is a square with the side length of 95 mm; the dielectric constant of the dielectric substrate of the fifth microstrip antenna is 2.2, and the thickness of the dielectric substrate of the fifth microstrip antenna is 3.5 mm; and the distance between the feed point of the fifth microstrip antenna and the central point is 30 mm.
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| CN201911424503.0A CN111009726A (en) | 2019-12-31 | 2019-12-31 | Multi-frequency band antenna |
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| CN201911424503.0A CN111009726A (en) | 2019-12-31 | 2019-12-31 | Multi-frequency band antenna |
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| CN208767459U (en) * | 2018-09-25 | 2019-04-19 | 江苏北斗天汇物联网科技有限公司 | A kind of four frequency combined antenna of Beidou |
| CN209374675U (en) * | 2019-03-20 | 2019-09-10 | 广州海格通信集团股份有限公司 | A kind of double frequency stacked microstrip antenna of small frequency multiplication |
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| CN204991952U (en) * | 2015-07-06 | 2016-01-20 | 广东盛路通信科技股份有限公司 | Miniaturized handheld quick -witted antenna of multifrequency |
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| CN109273829A (en) * | 2018-09-21 | 2019-01-25 | 上海海积信息科技股份有限公司 | A kind of satellite navigation array antenna |
| CN208767459U (en) * | 2018-09-25 | 2019-04-19 | 江苏北斗天汇物联网科技有限公司 | A kind of four frequency combined antenna of Beidou |
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