CN111478044B - Antenna module and terminal - Google Patents
Antenna module and terminal Download PDFInfo
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- CN111478044B CN111478044B CN202010261139.7A CN202010261139A CN111478044B CN 111478044 B CN111478044 B CN 111478044B CN 202010261139 A CN202010261139 A CN 202010261139A CN 111478044 B CN111478044 B CN 111478044B
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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
- H01Q21/0006—Particular feeding systems
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Abstract
The application discloses antenna module and terminal belongs to antenna technical field. The antenna module includes: the antenna comprises a first feed part, a second feed part, a reactance device, a first transmission line, a second transmission line, a first antenna and a second antenna; the reactance device comprises a first port and a second port; the first transmission line comprises a third port and a fourth port; the second transmission line comprises a fifth port and a sixth port; the first port is connected with the third port, and the second port is connected with the fifth port; the output end of the first feeding part is connected with the third port, and the output end of the second feeding part is connected with the fifth port; the fourth port is connected with the first antenna, and the sixth port is connected with the second antenna. The signal that this application can send first feed portion through reactance device and second transmission line is on coupling to the second antenna to offset the coupling between first antenna and the second antenna, improve the isolation between each antenna in the antenna group, improved signal transmission's reliability.
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, various terminals communicate through antennas, and more attention is paid to the quality of antenna communication.
In the related art, because the MIMO (Multiple-Input Multiple-Output) technology has the advantages that a transceiving system composed of a plurality of transmitting antennas and receiving antennas can be used to reduce channel fading and improve the utilization rate of frequency bands without increasing the transmitting power and bandwidth, and various terminals all adopt the MIMO antennas for communication.
For each antenna in the MIMO antenna, there is a problem of mutual coupling when operating, which causes interference between the antennas, and reduces reliability of signal transmission.
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 a first feed part, a second feed part, a reactance device, a first transmission line, a second transmission line, a first antenna and a second antenna;
the reactive device comprises a first port and a second port; the first transmission line includes a third port and a fourth port; the second transmission line comprises a fifth port and a sixth port;
the first port is connected with the third port, and the second port is connected with the fifth port;
the output end of the first feeding part is connected with the third port, and the output end of the second feeding part is connected with the fifth port;
the fourth port is connected with the first antenna, and the sixth port is connected with the second antenna.
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:
in the antenna module provided by the application, the reactance device comprises a first port and a second port; the first transmission line comprises a third port and a fourth port; the second transmission line comprises a fifth port and a sixth port; the first port is connected with the third port, and the second port is connected with the fifth port; the output end of the first feeding part is connected with the third port, and the output end of the second feeding part is connected with the fifth port; the fourth port is connected with the first antenna, and the sixth port is connected with the second antenna. The signal that this application can send first feed portion through reactance device and second transmission line couples to the second antenna on, thereby offset the coupling between first antenna and the second antenna, perhaps, this application can couple the signal that second feed portion sent to the first antenna through reactance device and first transmission line, thereby offset the coupling between first antenna and the second antenna, thereby isolation between first feed portion and the second feed portion has been improved, ECC between first antenna and the second antenna has been reduced, isolation between each antenna in the antenna group has been improved, signal transmission's reliability has been 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 schematic structural diagram of an antenna module 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, referring to fig. 3;
fig. 5 is a circuit diagram of an antenna module according to an exemplary embodiment of the present application;
fig. 6 is a schematic structural diagram of another antenna module according to an exemplary embodiment of the present application;
fig. 7 is a schematic structural diagram of an antenna module according to an exemplary embodiment of the present application;
FIG. 8 is a graph of scattering parameter changes for the first antenna and the second antenna of FIG. 7 according to an exemplary embodiment of the present application;
fig. 9 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.
The correlation of the MIMO antenna includes both signal correlation and envelope correlation, the former refers to the relationship between signals received from other antennas, and the latter refers to the degree of similarity between signals. Good antenna diversity in MIMO systems ensures high communication capacity, the diversity effect depending on the antenna correlation. Generally, for convenience of research, an Envelope Correlation Coefficient (ECC) is used to calculate the Correlation between antenna elements. The most common calculation methods at present are mainly two, one of which is:
wherein S is11、S22Representing the impedance matching of the antenna elements, S21、S12Indicating the degree of isolation, S, between the antenna elementsT 11Denotes S11Transposed result of (1), ST 21Denotes S21The transposed result of (eta)radRepresenting the radiation efficiency of the antenna.
As can be seen from equation (1), the size of the ECC is mainly related to the impedance matching of the antenna elements, the radiation efficiency of the antenna, and the isolation between the antenna elements. For MIMO antennas, impedance matching and radiation efficiency do not have much impact on ECC, and isolation is a key factor in determining ECC. Therefore, it is important to reduce the coupling of the antenna elements and improve the isolation of the antenna.
In daily life, 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, for example, the terminal MIMO antennas may work in a Sub-6GHz frequency band, which may also be referred to as Sub-6GHz antennas, in this case, there is a strong mutual coupling problem between the antennas of the terminals, which causes a poor isolation of feed ports of the antennas, thereby affecting data transmission and reducing reliability in a data transmission process.
In order to avoid the influence of each antenna when transmitting signals, improve the isolation between the feed ports and improve the reliability of signal transmission, the application provides a solution, which can reduce the mutual influence between the feed ports corresponding to the antennas for transmitting signals and improve the efficiency of antenna signal transmission when the terminal adopts the MIMO antenna to transmit signals. 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 a first feeding portion 201, a second feeding portion 202, a reactance device 203, a first transmission line 204, a second transmission line 205, a first antenna 206 and a second antenna 207;
wherein the reactive device 203 comprises a first port 203a and a second port 203 b; the first transmission line 204 includes a third port 204a and a fourth port 204 b; the second transmission line 205 includes a fifth port 205a and a sixth port 205 b.
The first port 203a is connected to the third port 204a, and the second port 203b is connected to the fifth port 205 a; the output end 201a of the first feeding part is connected with the third port 204a, and the output end 202a of the second feeding part is connected with the fifth port 205 a; the fourth port 204b is connected to the first antenna 206 and the sixth port 205b is connected to the second antenna 207.
In summary, in the antenna module provided in the present application, the reactance device includes a first port and a second port; the first transmission line comprises a third port and a fourth port; the second transmission line comprises a fifth port and a sixth port; the first port is connected with the third port, and the second port is connected with the fifth port; the output end of the first feeding part is connected with the third port, and the output end of the second feeding part is connected with the fifth port; the fourth port is connected with the first antenna, and the sixth port is connected with the second antenna. The signal that this application can send first feed portion through reactance device and second transmission line couples to the second antenna on, thereby offset the coupling between first antenna and the second antenna, perhaps, this application can couple the signal that second feed portion sent to the first antenna through reactance device and first transmission line, thereby offset the coupling between first antenna and the second antenna, thereby isolation between first feed portion and the second feed portion has been improved, ECC between first antenna and the second antenna has been reduced, isolation between each antenna in the antenna group has been improved, signal transmission's reliability has been improved.
In a possible implementation manner, the first antenna and the second antenna in the antenna module may both operate in at least two frequency bands, for example, the first antenna and the second antenna may both operate in multiple frequency bands, such as a 2.4GHz (gigahertz) frequency band and a 5GHz frequency band. The scheme shown in fig. 2 is described by taking as an example that the first antenna and the second antenna can operate in at least two frequency bands respectively.
Please refer to fig. 3, 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. 3, the antenna module 300 includes a first feeding portion 301, a second feeding portion 302, a reactance device 303, a first transmission line 304, a second transmission line 305, a first antenna 306, and a second antenna 307.
Wherein the reactive device 303 comprises a first port 303a and a second port 303 b; the first transmission line 304 includes a third port 304a and a fourth port 304 b; the second transmission line 305 includes a fifth port 305a and a sixth port 305 b.
The first port is connected to the third port 304a, and the second port 303b is connected to the fifth port 305 a; the output end of the first feeding portion 301 is connected with the third port 304a, and the output end of the second feeding portion 302 is connected with the fifth port 305 a; the fourth port 304b is connected to a first antenna 306 and the sixth port 305b is connected to a second antenna 307.
Optionally, when the first radio frequency signal is emitted from the output end of the first feeding portion 301, the first transmission line 304 is used for transmitting the first radio frequency signal to the first antenna 306; the reactance device 303 and the second transmission line 305 are used to transmit the first radio frequency signal to the second antenna 307; when the first radio frequency signal is emitted from the output end of the second feeding portion 302, the second transmission line 305 is used for transmitting the first radio frequency signal to the second antenna 307; the reactive device 303 and the first transmission line 304 are used to transmit the first radio frequency signal to the first antenna 306.
That is, when the first radio frequency signal is emitted from the output end of the first feeding portion 301, the first radio frequency signal is transmitted to the first antenna 306 through the first transmission line 304 to be radiated, and is transmitted to the second antenna 307 through the reactance device 303 and the second transmission line 305 to be radiated. When the first rf signal is emitted from the output end of the second feeding portion 302, the first rf signal is transmitted to the second antenna 307 through the second transmission line 305 and radiated, and the first rf signal is transmitted to the first antenna 306 through the reactance device 303 and the first transmission line 304 and radiated. Thereby realizing that the coupling degree between the first antenna 306 and the second antenna 307 is reduced when the first antenna 306 or the second antenna 307 radiates the first radio frequency signal, thereby improving the isolation degree between the antenna ports.
In a possible implementation manner, the antenna module 300 further includes a filter circuit 308, where the filter circuit 308 includes a seventh port 308a and an eighth port 308b, the seventh port is connected to the second port, and the eighth port is connected to the fifth port; the filter circuit is used for filtering a second frequency band, wherein the second frequency band is any one of the at least two frequency bands different from the frequency band of the first radio frequency signal.
Optionally, in the antenna module, the first antenna operates in the second frequency band, and the filter circuit may filter the radio frequency signal of the second frequency band transmitted to the second transmission line through the reactance device, so as to prevent the radio frequency signal of the second frequency band from entering the second antenna. Or, in the antenna module, the second antenna operates in the second frequency band, and the filter circuit can filter out the radio frequency signal of the second frequency band to be transmitted to the first transmission line, so as to prevent the radio frequency signal of the second frequency band from entering the first antenna.
Taking the example that the working frequency band of the first antenna includes the 2.4GHz and 5GHz frequency bands, and the working frequency band of the second antenna includes the 2.4GHz and 5GHz frequency bands, the working frequency band of the first radio frequency signal may be 2.4GHz, and then the second frequency band may be the 5GHz frequency band. That is, if the antenna module emits a radio frequency signal in a 2.4GHz band from the first feeding portion, the radio frequency signal can be transmitted to the first antenna through the first transmission line for radiation, and can also be transmitted to the second antenna through the reactance device and the second transmission line for radiation. If, in the antenna module, a radio frequency signal of a 5GHz band is emitted from the first feeding portion, the radio frequency signal may be transmitted to the first antenna through the first transmission line for radiation, but when the first radio frequency signal is to be transmitted to the second antenna through the reactance device and the second transmission line for radiation, the filter circuit may filter the radio frequency signal between the reactance device and the second transmission line. After the radio frequency signal of the 2.4GHz band and the radio frequency signal of the 5GHz band are sent by the second feeding part, the functions of all the parts are similar, and the description is omitted here.
In a possible implementation manner, the antenna module further includes a first matching circuit, a second matching circuit, a third matching circuit, and a fourth matching circuit; the output end of the first feed part is connected with the input end of the first matching circuit, and the output end of the first matching circuit is connected with the third port; the output end of the second feed part is connected with the input end of the second matching circuit, and the output end of the second matching circuit is connected with the fifth port; the fourth port is connected with the input end of a third matching circuit, and the output end of the third matching circuit is connected with the first antenna; the sixth port is connected with the input end of the fourth matching circuit, and the output end of the fourth matching circuit is connected with the second antenna.
Referring to fig. 4, which shows a schematic structural diagram of an antenna module according to an exemplary embodiment of the present application, referring to fig. 3, as shown in fig. 4, an antenna module 400 includes a first feeding portion 401, a second feeding portion 402, a first matching circuit 403, a second matching circuit 404, a reactance device 405, a filtering circuit 406, a first transmission line 407, a second transmission line 408, a third matching circuit 409, a fourth matching circuit 410, a first antenna 411, and a second antenna 412.
Wherein each matching circuit may be used to achieve impedance matching between two devices connected. For example, for the first matching circuit 403, the first matching circuit 403 may function to achieve impedance matching between the output of the first feeding portion 401 and the input of the first matching circuit 403, and impedance matching between the output of the first matching circuit 403 and the first port of the reactance device 405, and impedance matching between the output of the first matching circuit 403 and the first port of the first transmission line 407; for the second matching circuit 404, the second matching circuit 404 may function to achieve impedance matching between the output of the second feeding section 402 and the input of the second matching circuit 404, and impedance matching between the output of the second matching circuit 404 and the input of the filter circuit 406, and impedance matching between the output of the second matching circuit 404 and the input of the second transmission line 408; for the third matching circuit 409, the third matching circuit 409 may function to achieve impedance matching between the second port of the first transmission line 407 and the input of the third matching circuit 409, and impedance matching between the output of the third matching circuit 409 and the first antenna 411; for the fourth matching circuit 410, the fourth matching circuit 410 may function to achieve impedance matching between the second port of the second transmission line 408 and the input of the fourth matching circuit 410, and impedance matching between the output of the fourth matching circuit 410 and the second antenna 412.
Referring to fig. 5, a circuit diagram of an antenna module according to an exemplary embodiment of the present application is shown. As shown in fig. 5, the antenna module 500 includes a first power supply unit 501, a second power supply unit 502, a first matching circuit 503, a second matching circuit 504, a reactance device 505, a filter circuit 506, a first transmission line 507, a second transmission line 508, a third matching circuit 509, a fourth matching circuit 510, a first antenna 511, and a second antenna 512. Optionally, the reactance device shown in fig. 5 is a capacitive device, and in a possible implementation manner, the reactance device may also be an inductive device, or the reactance device may also be a circuit device formed by a plurality of capacitive devices or inductive devices.
Alternatively, in fig. 5, the size of the capacitor in the first matching circuit may be 0.4pF (picofarad) and the size of the inductor may be 2nH (millihenry). The size of the first capacitor 504a in the second matching circuit may be 0.2pF, the size of the first inductor 504b may be 6nH, the size of the second capacitor 504c may be 0.45pF, the size of the second inductor 504d may be 3nH, the size of the capacitor in the third matching circuit may be 0.55pF, and the size of the inductor may be 10 nH. The capacitance in the fourth matching circuit may be of a size of 0.5pF and the inductance may be of a size of 13 nH. The capacitance in the reactive device may be of the order of 0.6 pF. The size of the capacitor in the filter circuit can be 0.5pF, and the size of the inductor can be 1.6 nH.
Optionally, the impedances of the first transmission line and the second transmission line shown in fig. 3 are 50 ohms; the phase shift of the first transmission line and the second transmission line is proportional to the phase of a first isolation, and the first isolation is the isolation of the first antenna and the second antenna working in the frequency band of the first radio frequency signal. For example, after the first antenna radiates the first rf signal, the isolation S between the first antenna and the second antenna is: a × exp (j × b), where a is the amplitude of the isolation and b is the phase of the isolation, the phase shift M of the transmission line may be: 0.5 (b + pi/2), or, 0.5 (b-pi/2). Optionally, the reactance X of the reactance device satisfies the following formula: x is [2a/(1+ a) ]2)]0.02, or, X ═ 2a/(1+ a)2)]*0.02. Alternatively, if the reactive device is a capacitive element as shown in fig. 5, the capacitance C of the capacitive element satisfies the following equation: and X is 2 pi f C, wherein f is the frequency of the first radio frequency signal. Alternatively, if the reactive device is an inductive element, the inductance L of the inductive element satisfies the following equation: x ═ 1/(2 ═ pi × f ×) L, where f is still the frequency of the first rf signal.
In a possible implementation manner, the antenna module shown in fig. 3 further includes a third transmission line and a fourth transmission line; the third transmission line comprises a ninth port and a tenth port; the fourth transmission line comprises an eleventh port and a twelfth port; when a second radio-frequency signal is sent out from the output end of the first feeding part, the output end of the first feeding part is connected with the ninth port, the output end of the second feeding part is connected with the eleventh port, and the first port is connected with the ninth port; the tenth port is connected with the first antenna, the twelfth port is connected with the second antenna, and the second port is connected with the eleventh port.
Please refer to fig. 6, which illustrates a schematic structural diagram of another antenna module according to an exemplary embodiment of the present application. As shown in fig. 6, the antenna module 600 includes a first feeding portion 601, a second feeding portion 602, a reactance device 603, a first transmission line 604, a second transmission line 605, a third transmission line 606, a fourth transmission line 607, a first antenna 608, and a second antenna 609.
Wherein the reactance device 603 comprises a first port 603a and a second port 603 b; the first transmission line 604 includes a third port 604a and a fourth port 604 b; the second transmission line 605 includes a fifth port 605a and a sixth port 605b, the third transmission line 606 includes a ninth port 606a and a tenth port 606b, and the fourth transmission line 607 includes an eleventh port 607a and a twelfth port 607 b.
The first port 603a may be connected to the third port 604a and may also be connected to the ninth port 606 a. The second port 606b may be connected to the fifth port 605a and also to the eleventh port 607 a. The output end of the first feeding portion 601 may be connected to the third port 604a or the ninth port 606 a. The output of the second feeding portion 602 may be connected to the fifth port 605a or the eleventh port 607 a. The fourth port 604b may be connected to a first antenna 608, the ninth port 606a may be connected to the first antenna 608, the sixth port 605b may be connected to a second antenna 609, and the twelfth port 607b may be connected to the second antenna 609.
Optionally, when the radio frequency signal sent by the first feeding portion or the second feeding portion in the antenna module is the first radio frequency signal, the connection relationship in the antenna module may be as shown in fig. 3, and when the radio frequency signal sent by the first feeding portion or the second feeding portion is the second radio frequency signal, the connection relationship in the antenna module may be as shown in fig. 6. For example, when the radio frequency signal sent by the first feeding portion or the second feeding portion in the antenna module is a radio frequency signal of 2.4GHz, the connection relationship in the antenna module may be as shown in fig. 3, and when the radio frequency signal sent by the first feeding portion or the second feeding portion is a radio frequency signal of 5GHz, the connection relationship in the antenna module may be as shown in fig. 6. Optionally, the length of the first transmission line is the same as the length of the second transmission line, and the length of the third transmission line is the same as the length of the fourth transmission line.
Optionally, the first matching circuit, the second matching circuit, the third matching circuit, and the fourth matching circuit may also be added in fig. 6 in a manner similar to that shown in fig. 4, and are not described herein again.
In a possible implementation manner, the first antenna and the second antenna included in the antenna module provided in the embodiment of the present application are inverted-F antennas. That is, the transmitting ends of the first antenna and the second antenna are opposite, and the first antenna and the second antenna may be designed on the same ground plane, and input the antenna signal to be transmitted through their respective feeding ports. Referring to fig. 7, which shows a schematic structural diagram of an antenna module according to an exemplary embodiment of the present application, as shown in fig. 7, an antenna module 700 includes a first feeding portion 701, a second feeding portion 702, a reactance device 703, a filter Circuit 704, a first transmission line 705, a second transmission line 706, a first antenna 707, a second antenna 708, a matching Circuit 709, and a Printed Circuit Board (PCB) 710.
The first feed part can be connected with one end of the first transmission line through the matching circuit, and one end of the reactance device can also be connected with one end of the first transmission line; the other end of the reactance device is connected with one end of the filter circuit, the second feed portion can be connected with one end of the second transmission line through the matching circuit, the other end of the filter circuit can also be connected with one end of the second transmission line, the other end of the first transmission line can be connected with the first antenna through the matching circuit, and the other end of the second transmission line can also be connected with the second antenna through the matching circuit. Optionally, the first antenna includes a first antenna feed point 707a, the second antenna includes a second antenna feed point 708a, the other end of the first transmission line may be connected to the first antenna feed point 707a through a matching circuit, and the other end of the second transmission line may be connected to the second antenna feed point 708a through the matching circuit.
A Radio Frequency Integrated Circuit (RFIC) on the PCB may input a Radio Frequency signal through the first feeding unit 701 or the second feeding unit 702, and radiate the Radio Frequency signal through the transmitting terminals of the first antenna 707 and the second antenna 708. Alternatively, the antenna module shown in fig. 7 may operate in the FR1(Frequency Range 1) Frequency band and the FR2(Frequency Range 2) Frequency band in the 5G Frequency band. Among these, the FR2 band is also called Sub-6GHz band. Namely, the antenna module can transmit radio frequency signals of Sub-6GHz frequency band.
Referring to fig. 8, a graph illustrating scattering parameter variation of the first antenna and the second antenna of fig. 7 according to an exemplary embodiment of the present application is shown. As shown in fig. 8, a scattering parameter curve 801 between the first antenna and the second antenna, a scattering parameter curve 802 between the first antenna and the second antenna, a first sampling point 803, and a second sampling point 804 are included. The scattering parameter curve between the second antenna and the second antenna is coincident with the scattering parameter curve 801, and the scattering parameter curve between the second antenna and the first antenna is coincident with the scattering parameter curve 802, so that they are not shown in fig. 8. It can be seen from the first sampling point 803 in fig. 8 that the isolation between the first antenna and the second antenna is-26.374 dB when the first antenna transmits a signal with a frequency of 2.4303GHz, and it can be seen from the second sampling point 804 in fig. 8 that the isolation between the first antenna and the second antenna is-27.314 dB when the first antenna transmits a signal with a frequency of 5.6607 GHz.
It should be noted that the design forms of the first antenna and the second antenna included in the antenna module provided in the foregoing embodiment are also exemplary, and for a radiation scheme of multiple antennas in a MIMO system (for example, the first antenna is an inverted-F antenna, and the second antenna is a coupled antenna, etc.), the scheme provided in this application may also be adopted to achieve improvement of the antenna isolation, and the arrangement form of the specific antenna in this application is not limited.
In summary, in the antenna module provided in the present application, the reactance device includes a first port and a second port; the first transmission line comprises a third port and a fourth port; the second transmission line comprises a fifth port and a sixth port; the first port is connected with the third port, and the second port is connected with the fifth port; the output end of the first feeding part is connected with the third port, and the output end of the second feeding part is connected with the fifth port; the fourth port is connected with the first antenna, and the sixth port is connected with the second antenna. The signal that this application can send first feed portion through reactance device and second transmission line couples to the second antenna on, thereby offset the coupling between first antenna and the second antenna, perhaps, this application can couple the signal that second feed portion sent to the first antenna through reactance device and first transmission line, thereby offset the coupling between first antenna and the second antenna, thereby isolation between first feed portion and the second feed portion has been improved, ECC between first antenna and the second antenna has been reduced, isolation between each antenna in the antenna group has been improved, signal transmission's reliability has been improved.
Please refer to fig. 9, which illustrates a schematic structural diagram of a terminal according to an exemplary embodiment of the present application. As shown in fig. 9, the terminal 900 includes a first antenna module 901, a second antenna module 902, a third antenna module 903 and a fourth antenna module 904, and a plurality of antenna modules may share a same ground plane 905. The first antenna module 901, the second antenna module 902, the third antenna module 903 and the fourth antenna module 904 may all adopt the antenna modules provided in fig. 2 or fig. 3. Optionally, when the terminal sends data such as messages and videos by using one or two antenna modules, the terminal can reduce the coupling degree between the ports by matching the reactance devices, the transmission lines and the filter circuits in the antenna modules according to the frequency sent by the actual antenna module, so that the isolation degree between a plurality of antennas contained in the antenna module is improved, and a better transmission effect is achieved.
For example, when the terminal needs to transmit a signal in the sub-6GHz band to the outside by using the first feeding portion in the first antenna module, the first antenna module may couple energy of the signal to the second antenna through cooperation among the reactance devices, the transmission lines, and the filter circuits in each antenna module, and cancel out coupling between the second antenna and the first antenna, so as to reduce coupling between the first feeding portion and the second feeding portion, and improve isolation between the first antenna and the second antenna.
In summary, in the antenna module provided in the present application, the reactance device includes a first port and a second port; the first transmission line comprises a third port and a fourth port; the second transmission line comprises a fifth port and a sixth port; the first port is connected with the third port, and the second port is connected with the fifth port; the output end of the first feeding part is connected with the third port, and the output end of the second feeding part is connected with the fifth port; the fourth port is connected with the first antenna, and the sixth port is connected with the second antenna. The signal that this application can send first feed portion through reactance device and second transmission line couples to the second antenna on, thereby offset the coupling between first antenna and the second antenna, perhaps, this application can couple the signal that second feed portion sent to the first antenna through reactance device and first transmission line, thereby offset the coupling between first antenna and the second antenna, thereby isolation between first feed portion and the second feed portion has been improved, ECC between first antenna and the second antenna has been reduced, isolation between each antenna in the antenna group has been improved, signal transmission's reliability has been 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 (8)
1. An antenna module, characterized in that, the antenna module includes: the antenna comprises a first feed part, a second feed part, a reactance device, a filter circuit, a first transmission line, a second transmission line, a third transmission line, a fourth transmission line, a first antenna and a second antenna; the working frequency band of the first antenna comprises at least two frequency bands, the working frequency band of the second antenna comprises the at least two frequency bands, and the at least two frequency bands comprise Sub-6G frequency bands in 5G frequency bands; the filter circuit is used for filtering any one frequency band different from the Sub-6G frequency band in the at least two frequency bands; wherein the length of the first transmission line is the same as the length of the second transmission line, and the length of the third transmission line is the same as the length of the fourth transmission line;
the reactive device comprises a first port and a second port; the first transmission line includes a third port and a fourth port; the second transmission line comprises a fifth port and a sixth port; the filter circuit comprises a seventh port and an eighth port; the third transmission line comprises a ninth port and a tenth port; the fourth transmission line comprises an eleventh port and a twelfth port;
the first port is connected with the third port, the seventh port is connected with the second port, and the eighth port is connected with the fifth port;
the output end of the first feeding part is connected with the third port, and the output end of the second feeding part is connected with the fifth port;
the fourth port is connected with the first antenna, and the sixth port is connected with the second antenna;
when a second radio-frequency signal is emitted by the output end of the first feeding part, the output end of the first feeding part is connected with the ninth port but not connected with the third port, the first port is connected with the ninth port but not connected with the third port, the output end of the second feeding part is connected with the eleventh port but not connected with the fifth port, and the second port is connected with the eleventh port but not connected with the fifth port; the tenth port is connected to the first antenna, and the twelfth port is connected to the second antenna.
2. The antenna module of claim 1, wherein the first transmission line is configured to transmit a first radio frequency signal to the first antenna when the first radio frequency signal is emitted from the output of the first feed; the reactance device and the second transmission line are used for transmitting the first radio-frequency signal to the second antenna;
when the first radio-frequency signal is emitted from the output end of the second feeding part, the second transmission line is used for transmitting the first radio-frequency signal to the second antenna; the reactance device and the first transmission line are used for transmitting the first radio frequency signal to the first antenna.
3. The antenna module of claim 2, wherein the filter circuit is configured to filter a second frequency band, and the second frequency band is any one of the at least two frequency bands different from the frequency band of the first rf signal.
4. The antenna module of claim 1, further comprising a first matching circuit, a second matching circuit, a third matching circuit, and a fourth matching circuit;
the output end of the first feed part is connected with the input end of the first matching circuit, and the output end of the first matching circuit is connected with the third port;
the output end of the second feed part is connected with the input end of the second matching circuit, and the output end of the second matching circuit is connected with the fifth port;
the fourth port is connected with the input end of the third matching circuit, and the output end of the third matching circuit is connected with the first antenna;
the sixth port is connected with the input end of the fourth matching circuit, and the output end of the fourth matching circuit is connected with the second antenna.
5. The antenna module of any of claims 1-4, wherein the impedance of the first transmission line and the second transmission line is 50 ohms;
the phase shift of the first transmission line and the second transmission line is proportional to the phase of a first isolation, and the first isolation is the isolation of the first antenna and the second antenna working in the frequency band of the first radio frequency signal.
6. The antenna module of any one of claims 1 to 4, wherein the reactive device is a capacitive device or an inductive device.
7. The antenna module of any one of claims 1 to 4, wherein the first antenna and the second antenna are inverted-F antennas; alternatively, the first and second electrodes may be,
the first antenna is an inverted-F antenna, and the second antenna is a coupled antenna.
8. A terminal, characterized in that it comprises an antenna module according to any one of claims 1 to 7.
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| US20210409064A1 (en) * | 2020-06-30 | 2021-12-30 | Motorola Solutions, Inc. | Radio frequency architecture for reducing mutual interference between multiple wireless communication modalities |
| CN113644436A (en) * | 2021-08-18 | 2021-11-12 | 维沃移动通信有限公司 | Antenna system and electronic equipment |
| CN116231307A (en) * | 2021-12-02 | 2023-06-06 | 中兴通讯股份有限公司 | Antenna device and communication apparatus |
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| CN103004021A (en) * | 2010-05-24 | 2013-03-27 | 诺基亚公司 | Apparatus, methods, computer programs and computer readable storage mediums for wireless communication |
| CN105103371A (en) * | 2012-12-06 | 2015-11-25 | 微软技术许可有限责任公司 | Reconfigurable multiband antenna decoupling networks |
| CN209232947U (en) * | 2018-11-12 | 2019-08-09 | 上海安费诺永亿通讯电子有限公司 | A kind of dual band antenna systems using novel double-frequency decoupling method |
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| GB1003317A (en) * | 1961-07-28 | 1965-09-02 | Standard Telephones Cables Ltd | Radio navigational system |
| JP4571988B2 (en) * | 2007-01-19 | 2010-10-27 | パナソニック株式会社 | Array antenna device and wireless communication device |
| KR20130031000A (en) * | 2011-09-20 | 2013-03-28 | 삼성전자주식회사 | Antenna apparatus for portable terminal |
| JP2014112824A (en) * | 2012-10-31 | 2014-06-19 | Murata Mfg Co Ltd | Antenna device |
| CN105633575A (en) * | 2016-01-18 | 2016-06-01 | 深圳微迎智科技有限公司 | Antenna mutual-coupling elimination device and method and wire communication device |
| CN105870627A (en) * | 2016-03-31 | 2016-08-17 | 宇龙计算机通信科技(深圳)有限公司 | Mobile terminal, multi-antenna system and decoupling method |
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| CN103004021A (en) * | 2010-05-24 | 2013-03-27 | 诺基亚公司 | Apparatus, methods, computer programs and computer readable storage mediums for wireless communication |
| CN105103371A (en) * | 2012-12-06 | 2015-11-25 | 微软技术许可有限责任公司 | Reconfigurable multiband antenna decoupling networks |
| CN209232947U (en) * | 2018-11-12 | 2019-08-09 | 上海安费诺永亿通讯电子有限公司 | A kind of dual band antenna systems using novel double-frequency decoupling method |
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