CN114843779A - Double-antenna structure with high isolation and design method - Google Patents
Double-antenna structure with high isolation and design method Download PDFInfo
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- CN114843779A CN114843779A CN202210664190.1A CN202210664190A CN114843779A CN 114843779 A CN114843779 A CN 114843779A CN 202210664190 A CN202210664190 A CN 202210664190A CN 114843779 A CN114843779 A CN 114843779A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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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
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Abstract
The invention belongs to the technical field of antennas, and discloses a double-antenna structure with high isolation, which comprises: a first antenna, a second antenna and a ground plane; two corners on the same side of the grounding plate are respectively provided with a first clearance area and a second clearance area, and the first clearance area and the second clearance area are separated by a convex part of the grounding plate; a first antenna disposed in the first clearance area, a ground point of the first antenna being connected to a ground plane area adjacent to the first clearance area; a second antenna is disposed in the second clearance area, and a ground point of the second antenna is connected to a ground plane area adjacent to the second clearance area. According to the double-antenna structure with high isolation, disclosed by the embodiment of the invention, the coupling degree of the first antenna and the second antenna is adjusted by adjusting the positions of the grounding points of the first antenna and the second antenna, so that the double-antenna structure meets the requirement of isolation.
Description
Technical Field
The invention relates to the technical field of antennas in wireless communication transmission, in particular to a double-antenna structure with high isolation.
Background
Antennas have become an integral device in various wireless devices for transmitting and receiving electromagnetic wave signals. The multi-antenna technology can greatly improve the wireless transmission rate, and is widely applied to the scenes of fourth-generation mobile communication, fifth-generation communication systems, internet of everything and the like. To ensure excellent antenna characteristics, high isolation or low coupling between antennas must be achieved.
The traditional method realizes high isolation by enlarging the distance between the antennas, and is difficult to integrate more antenna devices into the wireless equipment. How to provide a dual antenna structure with high isolation is a problem to be solved urgently.
Disclosure of Invention
The embodiment of the invention provides a double-antenna structure with high isolation, which aims to solve the problem that the high isolation is realized by enlarging the distance between antennas in the prior art. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of embodiments of the present invention, a dual antenna structure with high isolation is disclosed.
In one embodiment, a dual antenna structure with high isolation, comprises: a first antenna, a second antenna and a ground plane;
two corners on the same side of the grounding plate are respectively provided with a first clearance area and a second clearance area, and the first clearance area and the second clearance area are separated by a convex part of the grounding plate;
a first antenna disposed in the first clearance area, a ground point of the first antenna being connected to a ground plane area adjacent to the first clearance area;
a second antenna is disposed in the second clearance area, and a ground point of the second antenna is connected to a ground plane area adjacent to the second clearance area.
Optionally, the degree of coupling of the first antenna and the second antenna is adjusted by adjusting the position of the grounding point of the first antenna and the grounding point of the second antenna.
Optionally, the first antenna is disposed in the first clearance area, and includes: a first feed, a first wire, a second wire; the first end of the first wire is connected with the first feed, and the second end of the first wire is connected with the second wire; the first end of the second conducting wire is a grounding point of the first antenna and is connected to a grounding plate area adjacent to the first clearance area, and the second end of the second conducting wire is suspended or connected with the grounding plate;
the second antenna is arranged in the second clearance area and comprises: a second feed, a third wire, a fourth wire; the first end of the third wire is connected with the second feed, and the second end of the third wire is connected with the fourth wire; the first end of the fourth conducting wire is the grounding point of the second antenna and is connected to the grounding plate area adjacent to the second clearance area, and the second end of the fourth conducting wire is suspended.
Optionally, the first wire is used as an excitation circuit of the first antenna to control impedance matching of the first antenna;
the second conducting wire is used as a radiation structure of the first antenna and controls the resonance frequency of the first antenna;
the third wire is used as an excitation circuit of the second antenna and controls the impedance matching of the second antenna;
the fourth wire is used as a radiation structure of the second antenna and controls the resonance frequency of the second antenna.
Optionally, the ground point of the first antenna is connected to an end of the ground plane region adjacent to the first clearance region.
Optionally, the ground point of the first antenna is connected to an upper end of the ground plane region adjacent to the first clearance region.
Optionally, the ground point of the second antenna is connected to a middle portion of the ground plane region adjacent to the second clearance region.
Optionally, the ground plate is overall in a convex shape, the first clearance area and the second clearance area are respectively located at two corners of the upper side of the ground plate, and the first clearance area and the second clearance area are separated by a convex part of the ground plate;
the ground point of the first antenna is connected to an upper end portion of the ground plane area adjoining the first clearance area, and the ground point of the second antenna is connected to a middle portion of the ground plane area adjoining the second clearance area.
Optionally, the first conducting wire includes a first impedance matching element, and the first impedance matching element is any one or a combination of more of a capacitive element, an inductive element, or a conducting wire.
Optionally, the third conductive line includes a second impedance matching element, and the second impedance matching element is any one or a combination of more of a capacitive element, an inductive element, or a conductive line.
According to a second aspect of the embodiments of the present invention, a method for designing a dual antenna structure with high isolation is provided.
In one embodiment, a method for designing a dual antenna structure with high isolation includes:
a first clearance area and a second clearance area are respectively arranged at two corners of the same side of the grounding plate, and the first clearance area and the second clearance area are separated by a convex part of the grounding plate;
a first antenna disposed in the first clearance area, a ground point of the first antenna being connected to a ground plane area adjacent to the first clearance area;
a second antenna disposed in the second clearance area, a ground point of the second antenna being connected to a ground plane area adjacent to the second clearance area;
the coupling degree of the first antenna and the second antenna is adjusted by adjusting the positions of the grounding point of the first antenna and the grounding point of the second antenna.
Optionally, the ground point of the first antenna is connected to an upper end of the ground plane area adjacent to the first clearance area, and the ground point of the second antenna is connected to a middle of the ground plane area adjacent to the second clearance area.
According to a third aspect of embodiments of the present invention, there is provided an electronic apparatus.
In one embodiment, the electronic device comprises the dual antenna structure with high isolation as described in any of the above embodiments.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the coupling degree of the first antenna and the second antenna is adjusted by adjusting the positions of the grounding points of the first antenna and the second antenna, so that the high isolation degree of a double-antenna structure is realized, the integration degree of the antenna is improved, and more antenna devices are integrated into the wireless equipment.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1a is a block diagram of a first embodiment of a dual antenna structure with high isolation;
fig. 1b is a schematic diagram illustrating a grounding point position of a first antenna according to an embodiment;
figure 1c is a schematic diagram illustrating a grounding point of a second antenna according to the first embodiment;
FIG. 2a is a block diagram of a second embodiment of a dual antenna structure with high isolation;
fig. 2b is a schematic diagram illustrating the grounding point positions of the first antenna and the second antenna according to the second embodiment;
FIG. 3 is a block diagram of a third embodiment of a dual antenna structure with high isolation;
FIG. 4 is a block diagram of a fourth embodiment of a dual antenna structure with high isolation;
FIG. 5 is a block diagram of an embodiment five of a dual antenna structure with high isolation;
FIG. 6 is a block diagram of a sixth embodiment of a dual antenna structure with high isolation;
FIG. 7a is a diagram of S parameters of the dual antenna structure according to the second embodiment;
fig. 7b is a graph of the S parameters of the reference antenna.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments herein to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the embodiments herein includes the full ambit of the claims, as well as all available equivalents of the claims. The terms "first," "second," and the like, herein are used solely to distinguish one element from another without requiring or implying any actual such relationship or order between such elements. In practice, a first element can also be referred to as a second element, and vice versa. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such structure, apparatus, or device. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a structure, device or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like herein, as used herein, are defined as orientations or positional relationships based on the orientation or positional relationship shown in the drawings, and are used for convenience in describing and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. In the description herein, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, and indirect connections via intermediary media, where the specific meaning of the terms is understood by those skilled in the art as appropriate.
Herein, the term "plurality" means two or more, unless otherwise specified.
Herein, the character "/" indicates that the preceding and following objects are in an "or" relationship. For example, A/B represents: a or B.
Herein, the term "and/or" is an associative relationship describing objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The traditional method realizes high isolation by enlarging the distance between the antennas, and is difficult to integrate more antenna devices into the wireless equipment. The embodiment of the invention discloses a double-antenna structure with high isolation, which realizes the high isolation of the double-antenna structure through the structure of a grounding plate, the configuration of a clearance area and the position of grounding points of two antennas.
Example one
As shown in fig. 1a, the present embodiment discloses a dual antenna structure with high isolation, which includes: a first antenna 12, a second antenna 13, and a ground plane 101; two corners of the same side of the ground plate 101 are respectively provided with a first clearance area 102a and a second clearance area 102b, and the first clearance area 102a and the second clearance area 102b are separated by a convex part 2 of the ground plate; the first antenna 12 is arranged in the first clearance area 102a, and the grounding point 15 of the first antenna is connected to the grounding plate area 17 (the thick line area 17 in fig. 1 b) adjacent to the first clearance area; the second antenna 13 is disposed in the second clearance area 102b, and its ground point 16 is connected to a ground plane area 18 (a thick line area 18 in fig. 1 c) adjacent to the second clearance area. The first antenna 12 is also connected to a first feed 110a and the second antenna 13 is also connected to a second feed 110 b.
The clearance is a region of the ground plate removed, and in the present embodiment, the first clearance 102a and the second clearance 102b are disposed at two corners of the same side of the ground plate 101. The first clearance area 102a has both sides opened outward and both sides adjacent to the ground plate 101, and the second clearance area 102b has both sides opened outward and both sides adjacent to the ground plate 101.
In this embodiment, the grounding point 15 of the first antenna is connected to the grounding plate area 17 adjacent to the first clearance area, the grounding point 16 of the second antenna is connected to the grounding plate area 18 adjacent to the second clearance area, and the coupling degree of the first antenna and the second antenna can be adjusted by adjusting the positions of the grounding point of the first antenna and the grounding point of the second antenna, namely, the position of the grounding point of the first antenna in the grounding plate area 17 and the position of the grounding point of the second antenna in the grounding plate area 18, so that the coupling degree of the first antenna and the second antenna meets the design requirement of the isolation degree of the antennas. Ideally, the positions of the grounding point of the first antenna and the grounding point of the second antenna are adjusted, so that near-field coupling formed by the first antenna and the second antenna is minimized, and optimal isolation is achieved.
Under the condition that the position of the grounding point of the first antenna and the position of the grounding point of the second antenna are limited, the structure of the antenna can be adjusted according to specific design requirements, for example, specific shapes, structures, wiring forms, feeding methods and the like of the first antenna and the second antenna can adopt different forms, so as to meet the requirements of different antenna designs on impedance matching, frequency modulation, structural optimization and the like.
Optionally, the ground plate is a metal plate. Optionally, the ground plate is laid on the printed circuit board. Optionally, the ground plate is disposed on a fixing carrier or a housing of the antenna of the present invention. The shape of the grounding plate in the embodiments of the present invention is only illustrative, and the shape of the grounding plate is not limited to the shape listed in the drawings of the present specification.
In the embodiments of the present invention, the capacitive element has a capacitance component, and may be a lumped element, such as a chip capacitor, a varactor, a transistor, or a distributed element, such as a parallel conductive line, a transmission line, or the like. The inductive element has an inductive component, and may be a lumped element, such as a chip inductor, a chip resistor, etc., or a distributed element, such as a wire, a coil, etc.
Example two
As shown in fig. 2a, the present embodiment discloses a dual antenna structure with high isolation, which includes: a first antenna, a second antenna, and a ground plane 101; a first clearance area 102a and a second clearance area 102b are respectively arranged at two corners of the same side of the ground plate; the first antenna is disposed in the first clearance area 102a, and includes: a first feed 110a, a first wire 111, a second wire 121; a first end of the first conducting wire 111 is connected with the first power feed 110a, and a second end of the first conducting wire 111 is connected with the second conducting wire 121; a first end of the second conductive line 121 is a first antenna ground point 15, and is connected to the ground plane area adjacent to the first clearance area 102a, a second end of the second conductive line 121 is suspended or connected to the ground plane 101, in this embodiment, the second end of the second conductive line 121 is suspended; the second antenna is disposed in the second clearance area 102b, and includes: a second feed 110b, a third wire 131, a fourth wire 141; the first end of the third wire 131 is connected to the second power supply 110b, and the second end of the third wire 131 is connected to the fourth wire 141; a first end of the fourth conductive line 141 is a second antenna ground point 16 connected to the ground plane area adjacent to the second clearance area, and a second end of the fourth conductive line 141 is floating.
The current phase of the second wire and the current phase of the fourth wire are adjusted by adjusting the positions of the first end of the second wire and the first end of the fourth wire, so that the coupling degree of the first antenna and the second antenna is adjusted, and the isolation degree of the first antenna and the second antenna meets the design requirement.
In this embodiment, the first wire 111 is used as an excitation circuit of the first antenna to control impedance matching of the first antenna; the second wire 121 serves as a radiation structure of the first antenna, and controls a resonance frequency of the first antenna. The third wire 131 serves as an excitation circuit of the second antenna and controls impedance matching of the second antenna; the fourth wire 141 serves as a radiation structure of the second antenna, and controls a resonance frequency of the second antenna.
In this embodiment, the ground plate 101 is in a convex shape as a whole, the first and second clearance areas 102a and 102b are respectively located at two corners of the upper side of the ground plate 101, and the first and second clearance areas 102a and 102b are separated by the ground plate protruding portion 2.
Optionally, the first conductive line 111 includes a first impedance matching element 112, and the first impedance matching element 112 is any one or a combination of more of a capacitive element, an inductive element, or a conductive line, and is used to adjust the impedance matching of the first antenna.
Optionally, the third wire 131 includes a second impedance matching element 132, and the second impedance matching element 132 is any one or a combination of more of a capacitive element, an inductive element, or a wire, and is used to adjust the impedance matching of the second antenna.
Alternatively, as shown in fig. 2b, the ground point 15 of the first antenna is connected to the end of the ground plane area ( thick line area 201 or 202 in fig. 2 b) adjacent to the first clearance area. The ground point 15 of the first antenna in this embodiment is connected to the upper end 201 of the ground plane area adjacent to the first clearance area. Optionally, the ground point 15 of the first antenna is connected to the lower end 202 of the ground plane region adjacent to the first clearance region. The upper end portion or the lower end portion in the embodiment of the present application is distinguished from the upper and lower portions with respect to the position in the drawings of the specification. Optionally, the length of the upper end 201 is 25% of the length of the ground plane area adjacent the first clearance, i.e. the position of the ground point 15 of the first antenna is located within the upper 25% of the ground plane area adjacent the first clearance. Optionally, the lower end 202 has a length that is 25% of the length of the ground plane area adjacent the first clearance, i.e., the ground point 15 of the first antenna is positioned within the lower 25% of the ground plane area adjacent the first clearance.
Alternatively, as shown in fig. 2b, the ground point 16 of the second antenna is connected to the middle 301 of the ground plane area (bold line area 301 in fig. 2 b) adjacent to the second clearance area. Optionally, the length of the middle portion 301 occupies 40% of the length of the ground plane area adjacent the second clearance region. I.e. the position of the ground point 16 of the second antenna is located within 40% of the middle of the ground plane area adjacent to the second clearance area.
In this embodiment, the grounding point 15 of the first antenna is arranged at the upper end 201 of the grounding plate area adjacent to the first clearance area, and the grounding point 16 of the second antenna is arranged at the middle 301 of the grounding plate area adjacent to the second clearance area, so that the current phase of the second wire and the fourth wire is 90 degrees, and the first antenna and the second antenna can form polarization orthogonality, thereby reducing the coupling degree between the two antennas and improving the isolation degree.
In this embodiment, the second conductive line 121 is located outside the first conductive line 111 and has an inverted L shape, a first end of the second conductive line 121 is connected to the ground plate 101, and a second end of the second conductive line is suspended and opened toward a lower left side. The second conductive line 121 is located outside the first conductive line 111, and the second conductive line 121 is located further outside than the first conductive line 111 than a position opposite to the ground plate 101.
In this embodiment, the fourth conductive line 141 is located outside the third conductive line 131, the fourth conductive line 141 is in a special-shaped structure, a first end of the fourth conductive line 141 is connected to the ground plane 101, and a second end of the fourth conductive line is suspended and opened to the left. The fourth conductive line 141 is located outside the third conductive line 131, and the fourth conductive line 141 is located further outside than the third conductive line 131 than the position opposite to the ground plate 101.
In the first antenna, the first wire 111 is used as an excitation circuit of the first antenna to control the impedance matching of the first antenna; the second wire 121 serves as a radiation structure of the first antenna, and controls a resonance frequency of the first antenna. In the second antenna, the third wire 131 is used as an excitation circuit of the second antenna to control impedance matching of the second antenna; the fourth wire 141 serves as a radiation structure of the second antenna, and controls a resonance frequency of the second antenna.
In other alternative embodiments, the antenna structure in the above embodiments further includes a capacitive element or an inductive element or a combination of the capacitive element and the inductive element, so as to achieve miniaturization of the antenna. The capacitive elements have a capacitive component and may be lumped elements, such as chip capacitors, varactors, transistors, etc., or distributed elements, such as parallel conductive lines, transmission lines, etc. The inductive element has an inductive component, and may be a lumped element, such as a chip inductor, a chip resistor, etc., or a distributed element, such as a wire, a coil, etc.
EXAMPLE III
As shown in fig. 3, the present embodiment discloses a dual antenna structure with high isolation, the first antenna includes a first feed 110a, a first conductive line 211, a second conductive line 221, a first clearance area 102 a; the second antenna includes a first feed 110b, a first wire 231, a second wire 241, and a second clearance area 102 b. In the first antenna, the first end of the first conductive line 211 is connected to the first feed 110a, and the second end is connected to the second conductive line 221. The first conductive line 211 includes a first impedance matching element 212. The second conductive line 221 has a first end connected to the ground plate and a second end floating and open to the lower left side. The second conductive line 221 is located outside the first conductive line 211 and has an inverted L-shape.
In the second antenna, the first end of the third wire 231 is connected to the second feed 110b, and the second end is connected to the fourth wire 241. The third conductive line 231 includes a second impedance matching element 232. The first end of the fourth conductive line 241 is connected to the ground plate, and the second end of the fourth conductive line is suspended and opened to the lower right side, forming an inverted C shape. The fourth conductive line 241 is located outside the third conductive line 231, and the fourth conductive line 241 further includes an inductive element 242.
Compared with the antenna structure disclosed in the second embodiment, the position, shape and grounding point of the first antenna are unchanged in the present embodiment; the position and the grounding point of the second antenna are unchanged, and only the shape of the second antenna is different.
Example four
As shown in fig. 4, the present embodiment discloses a dual antenna structure with high isolation, in the first antenna, a first end of a first conductive line 311 is connected to a first feed 110a, and a second end is connected to a second conductive line 321. The first conductive line 311 includes a first impedance matching element 312. The second conductive line 321 has a first end connected to the ground plate and a second end suspended and opened to the lower left. The second conductive line 321 is located outside the first conductive line 311, and the second conductive line 321 is in an inverted L shape.
In the second antenna, the third wire 331 has a first end connected to the second feed 110b and a second end connected to the fourth wire 341. The third conductive line 331 includes a second impedance matching element 332. The fourth conductive line 341 has a first end connected to the ground plate and a second end suspended and opened to the lower right. The fourth conductive line 341 is located outside the third conductive line 331, and the fourth conductive line 341 has a special-shaped structure.
Compared with the antenna structure disclosed in the second embodiment, the position, the shape and the grounding point of the first antenna are unchanged; the position of the ground point of the second antenna is adjusted but still in the region of the ground plane adjacent to the second clearance area, more precisely, the ground point of the second antenna is in the middle of the region of the ground plane adjacent to the second clearance area. Compared with the second disclosed antenna structure, the second antenna has a different wiring form.
EXAMPLE five
As shown in fig. 5, the present embodiment discloses a dual antenna structure with high isolation, in the first antenna, a first end of a first conducting wire 411 is connected to a first power feed 110a, and a second end is connected to a second conducting wire 421. The first conductive line 411 includes a first impedance matching element 412. The second conductive line 421 has a first end connected to the ground plate and a second end connected to the ground plate, and the second conductive line 421 includes a capacitive element 423 and an inductive element 422. The second conductive line 421 is located outside the first conductive line 411.
In the second antenna, the third conductive line 431 has a first end connected to the second feed 110b and a second end connected to the fourth conductive line 441, and the third conductive line 431 includes a second impedance matching element 432. The fourth conductive line 441 has a first end connected to the ground plate and a second end suspended in the air and opened to the left. The fourth conductive line 441 is positioned outside the third conductive line 431, and the fourth conductive line 441 has a special-shaped structure.
Compared with the antenna structure disclosed in the second embodiment, the position and the grounding point of the first antenna are unchanged, and the wiring mode of the first antenna is changed; the position, the grounding point and the shape of the second antenna are unchanged.
EXAMPLE six
As shown in fig. 6, the present embodiment discloses a dual antenna structure with high isolation, in the first antenna, a first end of a first conducting wire 511 is connected to a first power feed 110a, a second end is connected to a second conducting wire 521, and the first conducting wire 511 includes a first impedance matching element 512. The second conductive line 521 has a first end connected to the ground plate, a second end floating and opened to the upper left, and the second conductive line 521 includes an inductive element 522. The second conductive line 521 is located outside the first conductive line 511 and has a special-shaped structure.
In the second antenna, the first end of the third wire 531 is connected to the second feed 110b, the second end is connected to the fourth wire 541, and the third wire 531 includes the second impedance matching element 532. The fourth wire 541 has a first end connected to the ground plate and a second end suspended and open to the left. The fourth wire 541 is located outside the third wire 531, and the fourth wire 541 has an irregular structure.
Compared with the antenna structure disclosed in the second embodiment, the position and the grounding point of the first antenna are unchanged, and the wiring mode is changed; the position, the grounding point and the shape of the second antenna are unchanged.
Fig. 7a shows an S-parameter diagram of the dual antenna structure of the second embodiment.
Fig. 7a is a parameter diagram of a dual antenna structure disclosed in the second embodiment, and it can be seen from fig. 7a that the isolation between the first antenna and the second antenna can reach more than 15 dB. Fig. 7b is a diagram of S parameters generated by the reference antenna, the reference antenna adopts the same antenna position and the grounding point position is different, and it can be seen from fig. 7b that the isolation of the reference antenna is only about 5dB, which cannot meet the industrial requirement.
In other optional embodiments, the embodiment of the present invention further discloses a design method for a dual antenna structure with high isolation, wherein a first clearance area and a second clearance area are respectively disposed at two corners on the same side of the ground plane, and the first clearance area and the second clearance area are separated by a convex portion of the ground plane; a first antenna disposed in the first clearance area, a ground point of the first antenna being connected to a ground plane area adjacent to the first clearance area; a second antenna disposed in the second clearance area, a ground point of the second antenna being connected to a ground plane area adjacent to the second clearance area; the positions of the ground point of the first antenna and the ground point of the second antenna are adjusted such that near field coupling of the first antenna and the second antenna is minimized.
The principle of the design method of the dual antenna structure with high isolation in the above embodiments is the same as that of the dual antenna structure with high isolation disclosed in the above embodiments, and is not described herein again.
In other alternative embodiments, an embodiment of the present invention further provides an electronic device, where the electronic device includes the dual antenna structure with high isolation in any of the above alternative embodiments. For example, the electronic device is a router, or a network box, or a set-top box, or a wireless access point device, or a vehicle station, or a drone, or the like.
The present invention is not limited to the structures that have been described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (13)
1. A dual antenna structure with high isolation, comprising: a first antenna, a second antenna and a ground plane;
two corners on the same side of the grounding plate are respectively provided with a first clearance area and a second clearance area, and the first clearance area and the second clearance area are separated by a convex part of the grounding plate;
a first antenna disposed in the first clearance area, a ground point of the first antenna being connected to a ground plane area adjacent to the first clearance area;
a second antenna is disposed in the second clearance area, and a ground point of the second antenna is connected to a ground plane area adjacent to the second clearance area.
2. A dual antenna structure with high isolation as claimed in claim 1,
the coupling degree of the first antenna and the second antenna is adjusted by adjusting the positions of the grounding point of the first antenna and the grounding point of the second antenna.
3. A dual antenna structure with high isolation as claimed in claim 1,
the first antenna is arranged in the first clearance area and comprises: a first feed, a first wire, a second wire; the first end of the first wire is connected with the first feed, and the second end of the first wire is connected with the second wire; the first end of the second conducting wire is a grounding point of the first antenna and is connected to a grounding plate area adjacent to the first clearance area, and the second end of the second conducting wire is suspended or connected with the grounding plate;
the second antenna is arranged in the second clearance area and comprises: a second feed, a third wire, a fourth wire; the first end of the third wire is connected with the second feed, and the second end of the third wire is connected with the fourth wire; the first end of the fourth conducting wire is the grounding point of the second antenna and is connected to the grounding plate area adjacent to the second clearance area, and the second end of the fourth conducting wire is suspended.
4. A dual antenna structure with high isolation as claimed in claim 1,
the first wire is used as an exciting circuit of the first antenna and controls the impedance matching of the first antenna;
the second conducting wire is used as a radiation structure of the first antenna and controls the resonance frequency of the first antenna;
the third wire is used as an excitation circuit of the second antenna and controls the impedance matching of the second antenna;
the fourth wire is used as a radiation structure of the second antenna and controls the resonance frequency of the second antenna.
5. A dual antenna structure with high isolation as claimed in claim 1,
the ground point of the first antenna is connected to an end of the ground plane region adjacent to the first clearance region.
6. A dual antenna structure with high isolation as claimed in claim 5,
the ground point of the first antenna is connected to an upper end of the ground plane region adjacent to the first clearance region.
7. A dual antenna structure with high isolation as claimed in claim 1,
the ground point of the second antenna is connected to a middle portion of the ground plane region adjacent to the second clearance region.
8. A dual antenna structure with high isolation as claimed in claim 1,
the ground plate is integrally convex, the first clearance area and the second clearance area are respectively positioned at two corners of the upper side of the ground plate, and the first clearance area and the second clearance area are separated by a convex part of the ground plate;
the ground point of the first antenna is connected to an upper end portion of the ground plane area adjoining the first clearance area, and the ground point of the second antenna is connected to a middle portion of the ground plane area adjoining the second clearance area.
9. A dual antenna structure with high isolation as claimed in claim 1,
the first conducting wire comprises a first impedance matching element, and the first impedance matching element is any one or combination of more of a capacitive element, an inductive element or a conducting wire.
10. A dual antenna structure with high isolation as claimed in claim 1,
the third conducting wire comprises a second impedance matching element, and the second impedance matching element is any one or combination of more of a capacitive element, an inductive element or a conducting wire.
11. A method for designing a dual antenna structure with high isolation, comprising:
a first clearance area and a second clearance area are respectively arranged at two corners of the same side of the grounding plate, and the first clearance area and the second clearance area are separated by a convex part of the grounding plate;
a first antenna disposed in the first clearance area, a ground point of the first antenna being connected to a ground plane area adjacent to the first clearance area;
a second antenna disposed in the second clearance area, a ground point of the second antenna being connected to a ground plane area adjacent to the second clearance area;
the coupling degree of the first antenna and the second antenna is adjusted by adjusting the positions of the grounding point of the first antenna and the grounding point of the second antenna.
12. The method of claim 11, wherein the dual antenna structure with high isolation is designed,
the ground point of the first antenna is connected to an upper end portion of the ground plane area adjoining the first clearance area, and the ground point of the second antenna is connected to a middle portion of the ground plane area adjoining the second clearance area.
13. An electronic device characterized by comprising the dual antenna structure with high isolation of any one of claims 1 to 10.
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| CN202210664190.1A CN114843779A (en) | 2022-06-13 | 2022-06-13 | Double-antenna structure with high isolation and design method |
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| CN202210664190.1A CN114843779A (en) | 2022-06-13 | 2022-06-13 | Double-antenna structure with high isolation and design method |
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