CN110676563A - Antenna module and terminal - Google Patents
Antenna module and terminal Download PDFInfo
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- CN110676563A CN110676563A CN201910944424.6A CN201910944424A CN110676563A CN 110676563 A CN110676563 A CN 110676563A CN 201910944424 A CN201910944424 A CN 201910944424A CN 110676563 A CN110676563 A CN 110676563A
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
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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
- 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
- H01Q21/00—Antenna arrays or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
Abstract
The application discloses antenna module belongs to antenna technical field. The antenna module includes: the antenna comprises an antenna group, a ground plate and a filter circuit group; the antenna group comprises at least two antennas; the first antenna comprises an antenna head end and an antenna tail end; the first filter circuit comprises a first port and a second port, the first port is connected with the antenna tail end of the first antenna, and the second port is connected with the grounding plate; the first filter circuit is used for inhibiting current of the first specified frequency band signal from flowing into other antennas when the first antenna transmits the first radio frequency signal, and the other antennas are antennas except the first antenna in the at least two antennas. According to the antenna, the current of the first appointed frequency band signal is inhibited from flowing into other antennas through the first antenna, so that the current of the first appointed frequency band signal in the signal sent by the antenna does not flow into other antennas, the isolation between at least two antennas contained by the antenna group is improved, and the reliability of signal transmission is improved.
Description
Technical Field
The application relates to the technical field of antennas, in particular to an antenna module and a terminal.
Background
With the rapid development of the antenna technology field, the quality requirements of people for communication by adopting an antenna in a terminal in a communication process are higher and higher.
In the related art, MIMO (Multiple-Input Multiple-Output) technology has the advantages of reducing channel fading by using a transceiver system composed of Multiple transmitting antennas and Multiple receiving antennas and improving the utilization rate of frequency bands without increasing transmission power and bandwidth, and correspondingly employs MIMO antennas in various terminals for communication.
For each antenna in the MIMO antenna, the limitation of space is limited when the terminal is designed, so that interference exists between the antennas, and the reliability of signal transmission is reduced.
Disclosure of Invention
The embodiment of the application provides an antenna module and a terminal, which can improve the isolation among antennas contained in an MIMO antenna adopted in the terminal and improve the reliability of signal transmission. The technical scheme is as follows:
in one aspect, an embodiment of the present application provides an antenna module, where the antenna module includes: the antenna comprises an antenna group, a ground plate and a filter circuit group;
the antenna group comprises at least two antennas; the filter circuit group comprises at least two filter circuits respectively corresponding to the at least two antennas;
the first antenna comprises an antenna head end and an antenna tail end, and is any one antenna in the antenna group;
the first filter circuit comprises a first port and a second port, the first port is connected with the antenna tail end of the first antenna, the second port is connected with the grounding plate, and the first filter circuit is a filter circuit corresponding to the first antenna in the filter circuit group;
the first filter circuit is configured to suppress a current of a first specified frequency band signal from flowing into another antenna when the first antenna transmits a first radio frequency signal, where the another antenna is an antenna other than the first antenna among the at least two antennas.
In another aspect, an embodiment of the present application provides a terminal, where the terminal includes at least one antenna module according to the above aspect.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
the first port of a first filter circuit in the antenna group is connected with the antenna tail end of a first antenna, the second port of the first filter circuit is connected with a ground plate, and the first filter circuit is any one filter circuit in the filter circuit group; when the first antenna transmits a first radio frequency signal, the current of the first specified frequency band signal is inhibited from flowing into other antennas, and the other antennas are antennas except the first antenna in at least two antennas included in the antenna group. The current of the first appointed frequency band signal in the signal sent by the first antenna cannot flow into other antennas, so that the isolation between at least two antennas included in the antenna group is improved, and the reliability of signal transmission is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of an application scenario of a terminal for transmitting data according to an exemplary embodiment of the present application;
fig. 2 is a schematic structural diagram of an antenna module according to an exemplary embodiment of the present application;
fig. 3 is a top view of an antenna module of fig. 2 according to an exemplary embodiment of the present application;
fig. 4 is a schematic structural diagram of an antenna module according to an exemplary embodiment of the present application;
FIG. 5 is a schematic diagram of a connection structure of a first antenna and a first filter circuit according to an exemplary embodiment of the present application;
FIG. 6 is a circuit schematic of a filter circuit according to an exemplary embodiment of the present application;
FIG. 7 is a circuit schematic of a filter circuit according to an exemplary embodiment of the present application;
FIG. 8 is a circuit schematic of a filter circuit according to an exemplary embodiment of the present application;
fig. 9 is a schematic diagram of current flowing in an antenna module according to an exemplary embodiment of the present application when no filter circuit is disposed in the antenna module of fig. 4;
fig. 10 is a schematic diagram of a current flowing through an antenna module according to an exemplary embodiment of the present application, where the antenna module is provided with a filter circuit in fig. 4;
fig. 11 is a graph illustrating a variation of a reflection parameter between a first antenna and a second antenna according to an exemplary embodiment of the present application, when no filter circuit is disposed in the antenna module of fig. 9;
fig. 12 is a graph illustrating a variation of a reflection parameter between a first antenna and a second antenna when a filter circuit is disposed in the antenna module of fig. 10 according to an exemplary embodiment of the present application;
FIG. 13 is a graph illustrating the variation of the stop band characteristic of a filter circuit of FIG. 4 with the variation of the tunable device according to an exemplary embodiment of the present application;
fig. 14 is a schematic structural diagram of a terminal according to an exemplary embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The scheme provided by the application can be used in a real scene of transmitting signals through the MIMO antenna when people use the terminal adopting the MIMO antenna in daily life, and for convenience of understanding, some terms and application scenes related to the embodiment of the application are firstly and simply introduced below.
MIMO technology: the method is a technology for performing space diversity by using a plurality of transmitting antennas and receiving antennas at a transmitting end and a receiving end respectively, adopts a discrete multi-antenna, and can decompose a communication link into a plurality of parallel sub-channels, thereby improving the capacity of transmitting or receiving signals.
Isolation degree: among the antennas included in the MIMO antenna, when the first antenna transmits a signal of a certain frequency band, the second antenna receives the signal strength of the first antenna, and the magnitude of the signal strength of the second antenna receiving the signal of the certain frequency band transmitted by the first antenna may be referred to as an isolation between the first antenna and the second antenna in the frequency band.
With the rapid development of science and technology, the use of the terminal greatly facilitates the daily life of people, and people can use the terminal to work, study, entertain and the like. The user may transmit various data through an antenna in the terminal, for example, the user may send information such as a picture and a video taken by the user to another terminal, or the user may perform a voice call, a video call, and the like with another user through the terminal to transmit voice data or video data.
Please refer to fig. 1, which shows a schematic view of an application scenario of a terminal transmitting data according to an exemplary embodiment of the present application. As shown in fig. 1, a number of terminals 100 are included.
Alternatively, the terminal 110 may be a terminal in which a MIMO antenna is installed. For example, the terminal may be a mobile phone, a tablet computer, an e-book reader, smart glasses, a smart watch, an MP3 player (Moving Picture Experts group Audio Layer III, motion Picture Experts compression standard Audio Layer 3), an MP4 player (Moving Picture Experts group Audio Layer IV, motion Picture Experts compression standard Audio Layer 4), a notebook computer, a laptop computer, a desktop computer, and the like.
Optionally, different users may use different terminals to transmit signals to other terminals through MIMO antennas in the terminals themselves, so as to implement data transmission. At present, because a plurality of antennas are included in a MIMO antenna used in a terminal, interference may exist between the antennas, and reliability in a data transmission process is reduced.
In order to avoid the influence of each antenna in signal transmission and improve the reliability of signal transmission, the application provides a solution, which can realize that each antenna for sending signals restrains the antenna signals of the antenna when the terminal adopts the MIMO antenna to transmit signals, and reduce the influence on other antennas. Please refer to fig. 2, which illustrates a schematic structural diagram of an antenna module according to an exemplary embodiment of the present application. The antenna module provided by the embodiment of the present application can be applied to the terminal in the application scenario shown in fig. 1. As shown in fig. 2, the antenna module 200 includes an antenna group 201, a ground plate 202 and a filter circuit group 203;
Optionally, please refer to fig. 3, which shows a top view of an antenna module according to an exemplary embodiment of the present application related to fig. 2, as shown in fig. 3, the antenna module includes 3 antennas, a first antenna 301, a second antenna 302, a third antenna 303, and a ground plane 304, each antenna includes a respective antenna head end 305 and an antenna tail end 306, and the first antenna may be any one of the three antennas shown in fig. 3. The filter circuit is shielded by the antenna and is therefore not shown in fig. 3.
The filter circuit group 203 also includes at least two filter circuits corresponding to the at least two antennas respectively; that is, the number of the filter circuit groups 203 may be the same as the number of antennas in the antenna group 201, and one filter circuit is connected to each antenna. Optionally, taking an example that the first filter circuit provided in this embodiment of the present application may be connected to the first antenna, the first filter circuit 205 includes a first port 205a and a second port 205b, the first port 205a is connected to an antenna end 204b of the first antenna, the second port 205b is connected to the ground plane 202, and the first filter circuit 205 is any one filter circuit in the filter circuit group 203;
the first filter circuit 205 is configured to suppress a current of the first specified frequency band signal from flowing into another antenna when the first antenna 204 transmits the first radio frequency signal, where the another antenna is an antenna other than the first antenna among the at least two antennas.
Optionally, the first frequency band signal may be any frequency band included in the first radio frequency signal transmitted by the first antenna. The first filter circuit may provide a function of suppressing a current flowing through the first antenna when the first antenna transmits a signal, and suppress a current of the first specified frequency band signal from flowing into another antenna, thereby reducing an influence of the first antenna on the other antenna when the first antenna transmits a signal. Each antenna provided by the embodiment of the application can realize the suppression of self current when sending signals through the filter circuit connected with the antenna, and reduces the influence on other antennas.
In summary, a first port of a first filter circuit in the antenna group is connected to an antenna end of the first antenna, a second port of the first filter circuit is connected to the ground plane, and the first filter circuit is any one filter circuit in the filter circuit group; when the first antenna transmits a first radio frequency signal, the current of the first specified frequency band signal is inhibited from flowing into other antennas, and the other antennas are antennas except the first antenna in at least two antennas included in the antenna group. The current of the first appointed frequency band signal in the signal sent by the first antenna cannot flow into other antennas, so that the isolation between at least two antennas included in the antenna group is improved, and the reliability of signal transmission is improved.
In a possible implementation manner, the antenna module may further include a matching circuit group formed by matching circuits of the two antennas, and an antenna feed group formed by antenna feeds of the two antennas is taken as an example, where the antenna group includes two antennas and ends of the two antennas are arranged oppositely, and the scheme shown in fig. 2 is described.
Please refer to fig. 4, which illustrates a schematic structural diagram of an antenna module according to an exemplary embodiment of the present application. The antenna module provided in the embodiment of the present application may be applied to the terminal in the application scenario shown in fig. 1, that is, may be used in an MIMO system. As shown in fig. 4, the antenna module 400 includes an antenna group 401, a ground plate 402, a filter circuit group 403, a matching circuit group 404, and an antenna feed group 405.
the first antenna 406 includes a first antenna head 406a and a first antenna end 406b, and the second antenna 407 includes a second antenna head 407a and a second antenna end 407b, wherein the first antenna end 406b of the first antenna 406 is disposed opposite to the second antenna end 407b of the second antenna 407. Optionally, the relative arrangement mentioned in this embodiment may mean that an included angle between extension lines of the first antenna end 406b of the first antenna 406 and the second antenna end 407b of the second antenna 407 is greater than 0 degree, and optionally, the first antenna may be any one of the first antenna 406 or the second antenna 407.
The first filter circuit comprises a first port and a second port, the first port is connected with the tail end of the antenna of the first antenna, the second port is connected with the ground plate, and the first filter circuit is any one filter circuit in the filter circuit group.
As shown in fig. 4, the filter circuit group 403 includes a first filter circuit 408 and a second filter circuit 409, the first filter circuit 408 includes a first port 408a of the first filter circuit and a second port 408b of the first filter circuit, and the second filter circuit 409 includes a first port 409a of the second filter circuit and a second port 409b of the second filter circuit, so that the first filter circuit may be any one of the first filter circuit 408 or the second filter circuit 409. The first port 408a of the first filter circuit is connected to the first antenna terminal 406b, the second port 408b of the first filter circuit is connected to the ground plane 402, the first port 409a of the second filter circuit is connected to the second antenna terminal 407b, and the second port 409b of the second filter circuit is connected to the ground plane 402.
Optionally, the matching circuit group 404 may also include at least two matching circuits. The input end of the first matching circuit is connected with the third port of the first antenna feed source, the output end of the first matching circuit is connected with the first feed point, and the first matching circuit is a matching circuit arranged for the first antenna in the matching circuit group.
Optionally, the antenna feed group 405 may also include at least two antenna feeds corresponding to at least two antennas, and the first antenna may further include a first feed point; the first antenna feed source comprises a third port and a fourth port, the third port is connected with the first feed point, the fourth port is connected with the grounding plate, and the first antenna feed source is an antenna feed source arranged for the first antenna in the antenna feed source group.
For example, as shown in fig. 4, the matching circuit group 404 includes two matching circuits, and the antenna feed group 405 includes two antenna feeds, where the matching circuit group 404 includes a first matching circuit 410 and a second matching circuit 411, the first matching circuit 410 includes a first input port 410a and a first output port 410b, and the second matching circuit 411 includes a second input port 411a and a second output port 411 b. Alternatively, the first matching circuit may be a matching circuit (for example, the first matching circuit 410) in the matching circuit group 404 corresponding to the first antenna.
Antenna one 406 includes a first antenna feed 406c and antenna two 407 includes a second antenna feed 407 c. The antenna feed group 405 includes a first antenna feed 412 and a second antenna feed 413, where the first antenna feed 412 includes a third port 412a of the first antenna feed and a fourth port 412b of the first antenna feed, and the second antenna feed 413 includes a third port 413a of the second antenna feed and a fourth port 413b of the second antenna feed, and optionally, the first antenna feed may be any one of the first antenna feed 412 or the second antenna feed 413.
The first matching circuit 410 includes a first input port 410a connected to the third port 412a of the first antenna feed, a first output port 410b connected to the first antenna feed 406c, and a fourth port 412b connected to the ground plane 402. The second input port 411a of the second matching circuit 411 is connected to the third port 413a of the second antenna feed, the second output port 411b is connected to the second antenna feed point 407c, and the fourth port 413b of the second antenna feed is connected to the ground plane 402.
Optionally, when the first antenna includes the first antenna feed point, the first port of the first filter circuit may be further connected to any point on the first antenna from the end of the first antenna to a point before the nearest antenna feed point. Referring to fig. 5, a schematic diagram of a connection structure between a first antenna and a first filter circuit according to an exemplary embodiment of the present application is shown. As shown in fig. 5, the antenna includes a first antenna 501, a first filter circuit 502, and an antenna feed point 503. The first antenna 501 further includes an antenna head 501a and an antenna tail 502b, and the first filter circuit and the first antenna may be connected as shown in fig. 5, that is, the first filter circuit may be connected to any one point from the antenna tail 502b to the antenna feed point 503.
Optionally, when the first antenna transmits the first radio frequency signal, the first filter circuit may suppress a current of the first specified frequency band signal from flowing into another antenna, where the another antenna is an antenna other than the first antenna among the at least two antennas. As shown in fig. 4, when the antenna feed one 412 is excited, the antenna one 406 may operate normally to transmit signals of various frequencies, and at this time, the filter circuit one 408 may also operate to suppress the current when the antenna one 406 transmits the first specified frequency band signal, so that less current flows in the path from the antenna one 406 to the ground plate 402 to the antenna two 407. Similarly, when the antenna feed source two 413 is excited, the antenna two 407 can normally operate to transmit signals of various frequencies, and at this time, the filter circuit two 409 can also operate to suppress the current when the antenna two 407 transmits the signal of the first designated frequency band, so that less current flows in the path through the antenna two 407, the ground plate 402 and the antenna one 406. Optionally, when the antenna group includes at least two antennas as shown in fig. 3, the workflow of other antennas may also refer to the description in this step, and is not described herein again.
Optionally, the first filter circuit may include a passive device group and an adjustable device; the passive device group may include at least one capacitive device and at least one inductive device; the tunable device may be any one of a switching device or a capacitive device with a variable capacitance value. That is, as shown in fig. 4, each of the first filter circuit 408 and the second filter circuit 409 may include a passive device group and a tunable device. Taking the first filter circuit 408 as an example, please refer to fig. 6, which shows a circuit diagram of a filter circuit according to an exemplary embodiment of the present application. As shown in fig. 6, a capacitor device 601, an inductor device 602, and a tunable device 603 are included in the filter circuit 600. Optionally, when the first antenna transmits the first radio frequency signal, the first filter circuit forms a stop band for the first specified frequency band signal through the passive device group and the adjustable device. That is, when the first antenna transmits the first rf signal, the first filter circuit may form a stop band for the first specified frequency band signal through the capacitor device 601, the inductor device 602, and the tunable device 603, and may act as a barrier to the current flowing through the path from the first antenna 406 to the ground plate 402 to the second antenna 407.
In one possible implementation, when the adjustable device is a switching device; the first filter circuit comprises at least two branch circuits, the first branch circuit comprises at least one capacitance device, at least one inductance device and a switch device, and the first branch circuit is any one of the at least two branch circuits; when the first antenna transmits a first radio frequency signal, the first filter circuit forms a stop band for the first specified frequency band signal by turning on or off the first switching device, and the first switching device is any one of the at least one switching device.
Still taking the first filter circuit 408 as an example, please refer to fig. 7, which shows a circuit diagram of a filter circuit according to an exemplary embodiment of the present application. As shown in fig. 7, the filter circuit 700 includes a first branch circuit 701 and a first branch circuit 702, where the first branch circuit 701 further includes a first capacitor device 703, an inductor device 704, and a first switch device 705. The second branch circuit 702 further includes a second capacitor device 706, a second inductor device 707, and a second switch device 708. When the first antenna transmits the first radio frequency signal, the first filter circuit can change the impedance in the filter circuit by turning on or off the first switch device or the second switch device, so as to form a stop band for the first specified frequency band signal, thereby playing a role of blocking current flowing through a path of the first antenna 406-the ground plate 402-the second antenna 407. Alternatively, the two-branch circuit shown in fig. 7 is also only an example, and in practical applications, a greater number of branch circuits, such as three, four, etc., may be used, which is not limited in this embodiment of the present application.
In a possible implementation, when the tunable device is a capacitance device with a variable capacitance value; the first filter circuit comprises at least one branch circuit, the second branch circuit comprises at least one capacitor device, at least one inductor device and at least one capacitor device with variable capacitance value, and the second branch circuit is any one of the at least one branch circuit; when the first antenna transmits a first radio frequency signal, the first filter circuit forms a stop band for the first specified frequency band signal by adjusting the capacitor device with the variable first capacitance value.
Still taking the first filter circuit 408 as an example, please refer to fig. 8, which shows a circuit diagram of a filter circuit according to an exemplary embodiment of the present application. As shown in fig. 8, the filter circuit 800 includes a first branch circuit 801 and a second branch circuit 802, wherein the first branch circuit 801 includes a first capacitor 803, an inductor 804, and a first variable capacitor 805, and the variable capacitor is a capacitor whose capacitance value is variable. The second branch circuit 802 also includes a second capacitor device 808, a second inductor device 808, and a second variable capacitor 808. When the first antenna transmits the first radio frequency signal, the first filter circuit can change the impedance in the filter circuit by adjusting the first variable capacitor or the second variable capacitor to form a stop band for the first specified frequency band signal, so that the first filter circuit plays a role of blocking current flowing through a path of the first antenna 406, the ground plate 402 and the second antenna 407. Alternatively, the two-branch circuit shown in fig. 8 is also merely exemplary, and in practical applications, a greater number of three, four, etc. branch circuits may be used. In addition, in practical applications, a plurality of variable capacitors may be used in the branch circuit, which is not limited in the embodiment of the present application. Similarly, the working principle of the second filter circuit may refer to the first filter circuit, which is not described herein again.
Optionally, when the first antenna transmits the first radio frequency signal, the first matching circuit may further adjust an impedance between the first feed source and the first feed point to match with 50 ohms. That is, when the first antenna shown in fig. 4 transmits the first rf signal, the first matching circuit may further adjust the impedance between the first antenna feed and the first antenna feed to match 50 ohms. It should be noted that, the reference to matching 50 ohms in the present application means to adjust the impedance to be close to 50 ohms, for example, to adjust the impedance to be between 48 ohms and 52 ohms, or to adjust the impedance to be between 49 ohms and 51 ohms, and the specific interval value may be determined by practical circumstances and is not limited herein.
In a possible implementation manner, the first matching circuit may also include at least one capacitive device, at least one inductive device, and at least one variable capacitive device, and the first matching circuit may also adjust the variable capacitive device in itself to change the overall impedance, so that the impedance between the first feed source and the first feed point matches 50 ohms. The structure of the matching circuit is not limited in the embodiments of the present application.
Referring to fig. 9, a schematic diagram of a current flowing through an antenna module according to an exemplary embodiment of the present application when no filter circuit is disposed in the antenna module of fig. 4 is shown. As shown in fig. 9, the antenna module 900 includes a first antenna 901, a second antenna 902, and a ground element 903. As can be seen from fig. 9, when the first antenna is operated, if the current flowing through the first antenna is not suppressed by the filter circuit provided in the present embodiment, the current may flow into the second antenna, thereby affecting the signal transmission of the second antenna. Referring to fig. 10, a schematic diagram of a current flowing through an antenna module according to an exemplary embodiment of the present application when a filter circuit is disposed in the antenna module shown in fig. 4 is shown. As shown in fig. 10, the antenna module 1000 includes a first antenna 1001, a second antenna 1002, and a grounding body 1003. As can be seen from fig. 10, when the first antenna operates, the current flowing through the first antenna can be suppressed by the filter circuit provided in the present embodiment, so that the current flowing into the second antenna can be reduced, thereby improving the isolation between the first antenna and the second antenna, and reducing the influence of the current of the first antenna on the signal transmission of the second antenna.
Referring to fig. 11, a graph illustrating a variation of a reflection parameter between a first antenna and a second antenna according to an exemplary embodiment of the present application when no filter circuit is disposed in the antenna module of fig. 9 is shown. As shown in fig. 11, a reflection parameter curve 1101 between the first antenna and the first antenna, a reflection parameter curve 1102 between the first antenna and the second antenna, a first sampling point 1103 and a second sampling point 1104 are included. Since the reflection parameter curve between the second antenna and the second antenna coincides with the reflection parameter curve 1101, and the reflection parameter curve between the second antenna and the first antenna coincides with the reflection parameter curve 1102, they are not shown in fig. 11. From the first sampling point 1103 in FIG. 11, it can be seen that the isolation between the first antenna and the second antenna is-8.7722 decibels (dB) when the first antenna transmits a signal with a frequency of 2.4533GHz, and from the second sampling point 1104 in FIG. 11, the isolation between the first antenna and the second antenna is-17.869 dB when the first antenna transmits a signal with a frequency of 2.45 GHz.
Referring to fig. 12, a graph illustrating a variation of a reflection parameter between a first antenna and a second antenna when a filter circuit is disposed in the antenna module of fig. 10 according to an exemplary embodiment of the present application is shown. As shown in fig. 12, a reflection parameter curve 1201 between the first antenna and the second antenna, a reflection parameter curve 1202 between the first antenna and the second antenna, a first sampling point 1203, and a second sampling point 1204 are included. Since the reflection parameter curve between the second antenna and the second antenna coincides with the reflection parameter curve 1201, and the reflection parameter curve between the second antenna and the first antenna coincides with the reflection parameter curve 1202, they are not shown in fig. 12. It can be seen from the first sampling point 1203 in fig. 12 that the isolation between the first antenna and the second antenna is-22.083 dB when the first antenna transmits a signal with a frequency of 2.45GHz, and it can be seen from the second sampling point 1204 in fig. 12 that the isolation between the first antenna and the second antenna is-13.971 dB when the first antenna transmits a signal with a frequency of 2.45 GHz. As can be seen from fig. 11 and 12, after the filter circuit is used, the isolation between the antennas included in the antenna module is significantly improved, so that the influence of signal transmission between the antennas is reduced.
Referring to fig. 13, a graph of variation of the stop band characteristic of the filter circuit according to an exemplary embodiment of the present application with respect to fig. 4 according to an adjustable device is shown in fig. 13, which includes a stop band characteristic curve 1301 between the first antenna and the second antenna when the variable capacitance value of the first filter circuit is 1.2 Picofarads (PF), a stop band characteristic curve 1302 between the first antenna and the second antenna when the variable capacitance value of the first filter circuit is 1.5PF, a first sampling point 1303, and a second sampling point 1304. As can be seen from fig. 13, when the variable capacitance value of the first filter circuit is 1.2PF, the isolation between the first antenna and the second antenna is-14.627 dB when the first antenna transmits a signal with a frequency of 2.4244GHz, and when the variable capacitance value of the first filter circuit needs to be adjusted to 1.5PF according to actual requirements, the isolation between the first antenna and the second antenna is-13.939 dB when the first antenna transmits a signal with a frequency of 2.1821 GHz. Therefore, the antenna module provided by the embodiment of the application can change the isolation degree of different transmitting frequencies between the antennas by adjusting the adjustable devices in the filter circuit, and the adaptability is wider.
In summary, a first port of a first filter circuit in the antenna group is connected to an antenna end of the first antenna, a second port of the first filter circuit is connected to the ground plane, and the first filter circuit is any one filter circuit in the filter circuit group; when the first antenna transmits a first radio frequency signal, the current of the first specified frequency band signal is inhibited from flowing into other antennas, and the other antennas are antennas except the first antenna in at least two antennas included in the antenna group. The current of the first appointed frequency band signal in the signal sent by the first antenna cannot flow into other antennas, so that the isolation between at least two antennas included in the antenna group is improved, and the reliability of signal transmission is improved.
In addition, in the technical scheme provided by the embodiment of the application, the impedance between the antenna and the antenna feed source is matched with 50 ohms by adding the matching circuit between the antenna and the antenna feed source, and the performance of the antenna in signal transmission can be improved.
Referring to fig. 14, a schematic structural diagram of a terminal according to an exemplary embodiment of the present application is shown. As shown in fig. 14, the terminal 1400 includes a first antenna module 1401, a second antenna module 1402, a third antenna module 1403, and a fourth antenna module 1404, and a plurality of antenna modules may share a same ground plane 1405. The first antenna module 1401, the second antenna module 1402, the third antenna module 1403, and the fourth antenna module 1404 can all adopt the antenna modules provided in fig. 3 or fig. 4. Optionally, when the terminal uses one or two antenna modules to transmit data such as messages and videos, the terminal may adjust the variable capacitance in the filter circuit according to the frequency transmitted in the actual antenna module, so as to change the isolation between the antennas in the same antenna module, thereby achieving a better transmission effect.
For example, when the terminal needs to use the first antenna module to transmit a signal of 1.2 to 2.8GHz, the terminal may adjust the filter circuit in the first antenna module to form a stop band for the signal of 2.45GHz, and when the terminal needs to use the first antenna module to transmit a signal of 2.5 to 3.5GHz, the terminal may adjust the filter circuit in the first antenna module to form a stop band for the signal of 3.05 GHz.
In summary, a first port of a first filter circuit in the antenna group is connected to an antenna end of the first antenna, a second port of the first filter circuit is connected to the ground plane, and the first filter circuit is any one filter circuit in the filter circuit group; when the first antenna transmits a first radio frequency signal, the current of the first specified frequency band signal is inhibited from flowing into other antennas, and the other antennas are antennas except the first antenna in at least two antennas included in the antenna group. The current of the first appointed frequency band signal in the signal sent by the first antenna cannot flow into other antennas, so that the isolation between at least two antennas included in the antenna group is improved, and the reliability of signal transmission is improved.
It should be understood that reference herein to "and/or" describing an association of case objects means that there may be three relationships, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (11)
1. An antenna module, characterized in that, the antenna module includes: the antenna comprises an antenna group, a ground plate and a filter circuit group;
the antenna group comprises at least two antennas; the filter circuit group comprises at least two filter circuits respectively corresponding to the at least two antennas;
the first antenna comprises an antenna head end and an antenna tail end, and is any one antenna in the antenna group;
the first filter circuit comprises a first port and a second port, the first port is connected with the antenna tail end of the first antenna, the second port is connected with the grounding plate, and the first filter circuit is a filter circuit corresponding to the first antenna in the filter circuit group;
the first filter circuit is configured to suppress a current of a first specified frequency band signal from flowing into another antenna when the first antenna transmits a first radio frequency signal, where the another antenna is an antenna other than the first antenna among the at least two antennas.
2. The antenna module of claim 1, wherein the first filtering circuit comprises a passive device group and an adjustable device;
the passive device group comprises at least one capacitance device and at least one inductance device;
the tunable device is any one of a switching device or a capacitance device with a variable capacitance value.
3. The antenna module of claim 2, wherein the first filter circuit forms a stop band for the first specified frequency band signal via the set of passive devices and the tunable device when the first antenna transmits a first rf signal.
4. The antenna module of claim 2, wherein the tunable device is the switching device;
the first filter circuit comprises at least two branch circuits, the first branch circuit comprises at least one capacitance device, at least one inductance device and a switch device, and the first branch circuit is any one branch circuit in the at least one branch circuit;
when the first antenna transmits a first radio frequency signal, the first filter circuit forms a stop band for the first specified frequency band signal by turning on or off the first switching device, and the first switching device is any one of the at least one switching device.
5. The antenna module of claim 2, wherein the tunable device is a capacitive device with a variable capacitance value;
the first filter circuit comprises at least one branch circuit, the second branch circuit comprises at least one capacitance device, at least one inductance device and at least one capacitance device with variable capacitance, and the second branch circuit is any one branch circuit in the at least one branch circuit;
when the first antenna transmits a first radio frequency signal, the first filter circuit forms a stop band for the first specified frequency band signal by adjusting the capacitance device with the variable first capacitance value.
6. The antenna module of claim 1, wherein the antenna module further comprises a set of antenna feeds;
the antenna feed source group comprises at least two antenna feed sources respectively corresponding to the at least two antennas;
the first antenna further comprises a first feed point;
the first antenna feed source comprises a third port and a fourth port, the third port is connected with the first feed point, the fourth port is connected with the grounding plate, and the first antenna feed source is an antenna feed source corresponding to the first antenna in the antenna feed source group.
7. The antenna module of claim 6, further comprising a set of matching circuits;
the matching circuit group comprises at least two matching circuits;
the input end of a first matching circuit is connected with a third port of the first antenna feed source, the output end of the first matching circuit is connected with the first feed point, and the first matching circuit is a matching circuit arranged for the first antenna in the matching circuit group.
8. The antenna module of claim 7, wherein the first matching circuit adjusts an impedance between the first feed and the first feed point to match 50 ohms when the first antenna transmits a first radio frequency signal.
9. The antenna module of claim 1, wherein the antenna module is used in a multiple-input multiple-output (MIMO) system.
10. The antenna module of claim 1, wherein the end of the first antenna is disposed opposite the end of the other antenna.
11. A terminal, characterized in that it comprises at least one antenna module according to any one of claims 1 to 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910944424.6A CN110676563B (en) | 2019-09-30 | 2019-09-30 | Antenna module and terminal |
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|---|---|---|---|
| CN201910944424.6A CN110676563B (en) | 2019-09-30 | 2019-09-30 | Antenna module and terminal |
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| CN110676563B CN110676563B (en) | 2021-08-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113745804A (en) * | 2020-05-30 | 2021-12-03 | 荣耀终端有限公司 | Antenna device and electronic apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080074341A1 (en) * | 2006-09-27 | 2008-03-27 | Chung Kyung-Ho | Antenna assembly and portable terminal having the same |
| CN110165379A (en) * | 2019-06-05 | 2019-08-23 | 青岛海信移动通信技术股份有限公司 | Multifrequency antenna and terminal |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080074341A1 (en) * | 2006-09-27 | 2008-03-27 | Chung Kyung-Ho | Antenna assembly and portable terminal having the same |
| CN110165379A (en) * | 2019-06-05 | 2019-08-23 | 青岛海信移动通信技术股份有限公司 | Multifrequency antenna and terminal |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113745804A (en) * | 2020-05-30 | 2021-12-03 | 荣耀终端有限公司 | Antenna device and electronic apparatus |
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