CN111276797A

CN111276797A - Antenna device and terminal

Info

Publication number: CN111276797A
Application number: CN201811482700.3A
Authority: CN
Inventors: 胡育根
Original assignee: Hisense Mobile Communications Technology Co Ltd
Current assignee: Hisense Mobile Communications Technology Co Ltd
Priority date: 2018-12-05
Filing date: 2018-12-05
Publication date: 2020-06-12
Anticipated expiration: 2038-12-05
Also published as: CN111276797B

Abstract

The invention discloses an antenna device and a terminal, which are used for solving the problem that crosstalk exists between signals with overlapped working frequency bands when antenna radiators corresponding to low-frequency signals are ensured to be long enough in the prior art. In the embodiment of the invention, a grounding device is arranged between signal feed points which are connected with the same antenna radiator in the antenna device and have overlapped working frequency bands, and the grounding device is used for blocking part of frequency band signals from being sent by the tail end of the antenna radiator in the direction of the grounding device; the signal is sent by a signal feed point which is connected with the same antenna radiator and the working frequency band of which is overlapped. Therefore, the grounding device can guide the radio frequency signals of the specific frequency band with crosstalk into the ground so as to avoid the crosstalk between the same-frequency signals.

Description

Antenna device and terminal

Technical Field

The present invention relates to the field of wireless communication devices, and in particular, to an antenna apparatus and a terminal.

Background

With the definition of 5G technology and the deepening of related design, the multi-antenna technology has been an irreversible trend to replace the existing single antenna and main diversity dual-antenna technology, and meanwhile, with the continuous development of mobile phone technology, the mobile terminal made of metal material is gradually pursued by consumers due to the unique texture and luster, so that in order to avoid the shielding effect of metal, the metal casing of the mobile phone is inevitably selected as the multi-band antenna radiator.

In the current 4G and future 5G technologies, the frequency band bandwidth required and compatible by multiple antennas is increasingly wider, the possibility that signal sources of different systems sharing an antenna radiator use the same operating frequency is also increasingly higher, and in order to avoid crosstalk between common-frequency signals sent by signal sources of different systems, the method adopted at present is to directly ground the antenna radiator between two signal sources using the same frequency band as the operating frequency, so as to realize signal isolation.

However, when the multi-antenna technology is applied to a smart phone, the length of an antenna radiator configured for the smart phone is limited due to the size limitation of the smart phone. Therefore, when the condition that the low-frequency band signal sent by the LTE signal feed point can have the corresponding antenna radiator with enough length is ensured, a direct grounding device cannot be arranged between the GPS signal feed point and the LTE signal feed point of the antenna radiator, at the moment, because the working frequency band of the WiFi signal is overlapped with the working frequency band of the LTE high-frequency signal, and the working frequency of the GPS radio-frequency signal source is overlapped with the working frequency of the LTE intermediate-frequency signal, the WiFi signal and the LTE high-frequency signal and the GPS signal LTE intermediate-frequency signal have crosstalk.

In summary, when the antenna radiator corresponding to the low-frequency signal is ensured to be long enough, crosstalk may exist between signals with overlapping working frequency bands.

Disclosure of Invention

The invention provides an antenna device and a terminal, which are used for solving the problem that crosstalk exists between signals with overlapped working frequency bands when antenna radiators corresponding to low-frequency signals are ensured to be long enough in the prior art.

An embodiment of the present invention provides an antenna apparatus, including: the antenna comprises at least two signal feed points, a signal transmission channel corresponding to the signal feed points, an antenna radiator electrically connected with the signal transmission channel, and at least one grounding device; the grounding device is positioned between signal feed points which are connected with the same antenna radiator and have overlapped working frequency bands;

the grounding device is used for blocking partial frequency band signals from being transmitted by the tail end of the antenna radiator in the direction of the grounding device;

the signal is sent by the signal feed point which is connected with the same antenna radiator and the working frequency band of which is overlapped.

The antenna device comprises at least two signal feed points, a signal transmission channel corresponding to the signal feed points, an antenna radiator electrically connected with the signal transmission channel and at least one grounding device; the grounding device is positioned between signal feed points which are connected with the same antenna radiator and have overlapped working frequency bands; the grounding device is used for blocking partial frequency band signals from being transmitted by the tail end of the antenna radiator in the direction of the grounding device; the signal is sent by the signal feed point which is connected with the same antenna radiator and the working frequency band of which is overlapped. After the antenna device is connected with the same antenna radiator and the two signal feeding points with overlapped working frequency bands emit frequency signals, the set grounding device can guide the radio-frequency signals transmitted to the connection point of the grounding device and the antenna radiator into the ground, so that the two signal feeding points with overlapped working frequency bands connected with the same antenna radiator emit the radio-frequency signals which are respectively transmitted through the antenna radiator without overlapping, and therefore crosstalk between the same-frequency signals is avoided.

In a possible embodiment, the grounding device comprises at least one metal body and a band control unit;

the metal body and the antenna radiator form a coupling capacitor;

the frequency band control unit is used for changing an equivalent inductance value of the grounding device and/or an equivalent capacitance value of the grounding device so as to change the frequency band range of the blocked signals.

The grounding device in the antenna device comprises at least one metal body and a frequency band control unit; the metal body and the antenna radiator form a coupling capacitor, the frequency band control unit is connected in series, when the antenna device transmits signals, the frequency band control unit changes an equivalent inductance value of the grounding device and/or an equivalent capacitance value of the grounding device, so that the inherent frequency of a circuit formed by the frequency band control unit and the coupling capacitor is equal to the middle value of the frequency band range of the signals to be blocked, and further the signals of partial frequency bands transmitted to the direction of the grounding device from the signal feed point can be blocked by the grounding device and transmitted through the antenna radiator.

In a possible embodiment, the grounding device comprises a metal body;

the frequency band control unit comprises a multi-control switch and a frequency band limiting device connected with the ground;

the multi-control switch is used for communicating the metal body with the frequency band limiting device or grounding the metal body.

The grounding device in the antenna device comprises a metal body, and the metal body and the antenna radiator form a coupling capacitor; the frequency band control unit consists of a multi-control switch and a frequency band limiting device connected with the ground; and the one end of the multi-control switch is connected with the metal body and is used for communicating the metal body with the frequency band limiting device or grounding the metal body. Therefore, when signals with different frequencies need to be blocked and are transmitted to the grounding device through the antenna radiator, the chip can control the multi-control switch to be connected to the frequency band limiting device corresponding to the signal frequency band or be directly grounded, so that the inherent frequency of a circuit formed by the frequency band limiting device and the coupling capacitor is equal to the middle value of the frequency band range of the signals needing to be blocked, and the purpose of blocking the signals from being transmitted to the grounding device through the antenna radiator is achieved.

In a possible embodiment, the grounding device comprises at least two metal bodies;

the frequency band control unit comprises at least one frequency band limiting device, one end of the frequency band limiting device is grounded, and the other end of the frequency band limiting device is connected with the metal body;

different metal bodies are connected with different frequency band limiting devices, and the number of the frequency band limiting devices is not more than that of the metal bodies;

the metal body not connected to the band limiting device is grounded.

The grounding device in the antenna device comprises at least two metal bodies, and the frequency band control unit comprises at least one frequency band limiting device, wherein one end of the frequency band limiting device is grounded, and the other end of the frequency band limiting device is connected with the metal bodies; different metal bodies are connected with different frequency band limiting devices, and the number of the frequency band limiting devices is not more than that of the metal bodies; the metal body of the unconnected band limiting device is grounded. Therefore, the grounding device comprises at least one self-resonant circuit formed by a coupling capacitor and different frequency band limiting devices, wherein the natural frequency of each self-resonant circuit is equal to the middle value of the frequency band range corresponding to a signal to be blocked, so that the aim of blocking the signal from being transmitted to the direction of the grounding device through the antenna radiator can be fulfilled.

In a possible embodiment, the grounding device comprises at least one capacitor and a frequency band control unit;

one end of the capacitor is electrically connected with the antenna radiator, and the other end of the capacitor is connected with the frequency band control unit;

The grounding device in the antenna device comprises at least one capacitor and a frequency band control unit; when the antenna device transmits signals, the frequency band control unit changes the equivalent inductance value of the grounding device and/or the equivalent capacitance value of the grounding device, so that the natural frequency of a circuit formed by the frequency band control unit and the capacitor is equal to the middle value of the frequency band range of the signals to be blocked, and further the signals of partial frequency bands transmitted to the direction of the grounding device from the signal feed point can be blocked by the grounding device and transmitted through the antenna radiator.

In a possible embodiment, the grounding means comprises a capacitor;

the multi-control switch is used for communicating the capacitor with the frequency band limiting device or grounding the capacitor.

The grounding device in the antenna device comprises a capacitor, one end of the capacitor is electrically connected with the antenna radiator, and the other end of the capacitor is connected with the frequency band control unit; meanwhile, the frequency band control unit consists of a multi-control switch and a frequency band limiting device connected with the ground; the multi-control switch is connected with the capacitor and used for communicating the capacitor with the frequency band limiting device or grounding the capacitor. Therefore, when signals with different frequencies need to be blocked and are transmitted to the grounding device through the antenna radiator, the chip can control the multi-control switch to be connected to the frequency band limiting device corresponding to the signal frequency band or be directly grounded, so that the inherent frequency of the self-resonant circuit formed by the frequency band limiting device and the capacitor is equal to the middle value of the frequency band range of the signals needing to be blocked, and the purpose of blocking the signals from being transmitted to the grounding device through the antenna radiator is achieved.

In a possible embodiment, the grounding means comprise at least two capacitors;

the frequency band control unit comprises at least one frequency band limiting device, one end of the frequency band limiting device is grounded, and the other end of the frequency band limiting device is connected with the capacitor;

different capacitors are connected with different frequency band limiting devices, and the number of the frequency band limiting devices is not more than that of the capacitors;

the capacitance to which the band limiting device is not connected is grounded.

The grounding device in the antenna device comprises at least two capacitors, and the frequency band control unit comprises at least one frequency band limiting device, wherein one end of the frequency band limiting device is grounded, and the other end of the frequency band limiting device is connected with the capacitors; different capacitors are connected with different frequency band limiting devices, and the number of the frequency band limiting devices is not more than that of the capacitors; the capacitor of the unconnected band limiting device is grounded. In this way, the grounding device comprises at least one self-resonant circuit formed by different capacitors and different frequency band limiting devices, wherein the natural frequency of each self-resonant circuit corresponds to the middle value of the frequency band range of a signal to be blocked, so that the aim of blocking the signal from being transmitted to the grounding device through the antenna radiator can be fulfilled.

In a possible embodiment, the grounding device comprises at least one inductance and a frequency band control unit;

one end of the inductor is electrically connected with the antenna radiator, and the other end of the inductor is connected with the frequency band control unit;

the frequency band control unit is used for changing the equivalent inductance value of the grounding device and/or the equivalent inductance value of the grounding device so as to change the frequency band range of the blocked signals.

The grounding device in the antenna device comprises at least one inductor and a frequency band control unit; when the antenna device transmits signals, the frequency band control unit changes the equivalent inductance value of the grounding device and/or the equivalent inductance value of the grounding device, so that the natural frequency of a circuit formed by the frequency band control unit and the inductor is equal to the middle value of the frequency band range of the signals to be blocked, and further the signals of partial frequency bands transmitted to the direction of the grounding device from the signal feed point can be blocked by the grounding device and transmitted through the antenna radiator.

In a possible embodiment, the grounding device comprises an inductor;

the multi-control switch is used for communicating the inductor with the frequency band limiting device or grounding the inductor.

The grounding device in the antenna device comprises an inductor, one end of the inductor is electrically connected with the antenna radiator, and the other end of the inductor is connected with the frequency band control unit; meanwhile, the frequency band control unit consists of a multi-control switch and a frequency band limiting device connected with the ground; the multi-control switch is connected with an inductor and is used for communicating the inductor with the frequency band limiting device or grounding the inductor. Therefore, when signals with different frequencies need to be blocked and are transmitted to the grounding device through the antenna radiator, the chip can control the multi-control switch to be connected to the frequency band limiting device corresponding to the signal frequency band or be directly grounded, so that the inherent frequency of the self-resonant circuit formed by the frequency band limiting device and the inductor is equal to the middle value of the frequency band range of the signals needing to be blocked, and the purpose of blocking the signals from being transmitted to the grounding device through the antenna radiator is achieved.

In a possible embodiment, the grounding device comprises at least two inductors;

the frequency band control unit comprises at least one frequency band limiting device, one end of the frequency band limiting device is grounded, and the other end of the frequency band limiting device is connected with the inductor;

different inductors are connected with different frequency band limiting devices, and the number of the frequency band limiting devices is not more than that of the inductors;

the inductance not connected to the band limiting device is grounded.

The grounding device in the antenna device comprises at least two inductors, the frequency band control unit comprises at least one frequency band limiting device, one end of the frequency band limiting device is grounded, and the other end of the frequency band limiting device is connected with the inductors; different inductors are connected with different frequency band limiting devices, and the number of the frequency band limiting devices is not more than that of the inductors; the inductance of the unconnected band limiting device is grounded. In this way, the grounding device comprises at least one self-resonant circuit formed by different inductors and different frequency band limiting devices, wherein the natural frequency of each self-resonant circuit corresponds to the middle value of the frequency band range of a signal to be blocked, so that the aim of blocking the signal from being transmitted to the grounding device through the antenna radiator can be fulfilled.

In a possible embodiment, the grounding device comprises a multi-control switch and a frequency band limiting device connected with at least one ground; the multi-control switch is used for connecting the frequency band limiting device corresponding to the signal to be blocked with the antenna radiating body and disconnecting the rest frequency band limiting devices from the antenna radiating body.

The grounding device in the antenna device comprises a multi-control switch and a frequency band limiting device connected with at least one ground, wherein the switch connects the frequency band limiting device corresponding to the signal to be blocked with the antenna radiator according to different working frequencies of the signal to be blocked, and disconnects the connection between the other frequency band limiting devices and the antenna radiator. In this way, the antenna radiator is grounded by means of the band-defining device corresponding to the signal to be blocked, which is introduced into the ground via the grounding device when the signal to be blocked is transmitted to the connection point between the grounding device and the antenna radiator.

In a possible embodiment, the band limiting means comprise at least one capacitor and/or at least one inductor.

The frequency band limiting device of the antenna device comprises at least one capacitor and/or at least one inductor, and the equivalent inductance value of the grounding device and/or the equivalent capacitance value of the grounding device can be changed by changing the capacitor and/or the inductor contained in the frequency band limiting device, so that the frequency band range of the blocked signals can be changed.

An embodiment of the present invention provides a terminal, where the terminal includes at least one antenna apparatus described above.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic diagram of a metal casing of a mobile phone as an antenna radiator in the prior art;

fig. 2 is a schematic structural diagram of a smart phone antenna device in the prior art;

fig. 3 is a schematic diagram of a transmission direction of a smart phone antenna device according to the prior art;

fig. 4 is a schematic structural diagram of an antenna device according to an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a signal transmission direction when the antenna device is applied to a smart phone according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an antenna device formed by using a metal body according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an antenna device formed by using a metal body according to a first embodiment of the present invention;

fig. 8 is a schematic structural diagram of an antenna device formed by a second metal body according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of an antenna device formed by applying capacitors according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a first antenna device formed by using capacitors according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a second antenna device formed by applying capacitors according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of an antenna device formed by using inductors according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of a first antenna device formed by using inductors according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a second antenna device formed by using inductors according to an embodiment of the present invention;

fig. 15 is a schematic structural diagram of an antenna apparatus directly formed by a switch and a band limiting device according to an embodiment of the present invention.

Detailed Description

The embodiment of the invention relates to an antenna device, which is assembled in terminal equipment. Wherein the terminal device may be a smartphone. In the embodiment of the present invention, an antenna device in the embodiment of the present invention is configured in a smart phone as an example.

As shown in fig. 1, in the current smart phone, a metal shell is used as an antenna radiator of multiple antennas, the metal shell with upper and lower boundaries is used as a radiator of an antenna device, and the metal shells on the left and right sides are grounded.

In the prior art, a smart phone is generally configured with three radio frequency signal sources, namely, WiFi, GPS and LTE, wherein the frequency of a radio frequency signal sent by the WiFi radio frequency signal source is about 2.4GHz, and the radio frequency signal is a high frequency signal; the frequency of the radio frequency signal sent by the GPS radio frequency signal source is about 1575.42MHz and is an intermediate frequency signal; the radio frequency signals sent by the LTE radio frequency signal source comprise radio frequency signals with three frequencies, namely high-frequency signals overlapping with a WiFi radio frequency signal frequency band, intermediate-frequency signals overlapping with a GPS radio frequency signal frequency band and low-frequency signals with the frequency of 800-900 MHz.

Fig. 2 is a diagram of a manner in which a multi-antenna device is disposed on a smart phone in the prior art, in which, taking an upper side metal body as an antenna radiator as an example, three rf signal sources of WiFi, GPS and LTE are sequentially disposed on the antenna radiator, and since the operating frequency of the WiFi rf signal source overlaps the high-frequency operating frequency of the LTE rf signal source and the operating frequency of the GPS rf signal source overlaps the intermediate-frequency operating frequency of the LTE rf signal source, a direct grounding process is performed between the GPS rf signal source and the LTE rf signal source, and the WiFi rf signal source is disposed on a side of the GPS rf signal source close to an antenna radiator emission endpoint. Therefore, according to the characteristics of the point discharge effect of the radio frequency signal, the radio frequency signal finds the simplest path to radiate, so that the signal can form radiation at the tail end of the antenna radiator, and the efficiency is highest. And due to the direct grounding arrangement, the signals transmitted to the direct grounding point will all be directed to ground, see in particular fig. 3.

In fig. 3, f1 is a low-frequency rf signal sent by an LTE rf signal source; f2 is an intermediate frequency radio frequency signal sent by an LTE radio frequency signal source and an intermediate frequency signal sent by a GPS radio frequency signal source; f3 is an intermediate frequency radio frequency signal sent by an LTE radio frequency signal source and a WiFi signal sent by a WiFi radio frequency signal source, because the GPS radio frequency signal source and the LTE radio frequency signal source are directly grounded, the WiFi radio frequency signal and the GPS radio frequency signal are transmitted leftwards, radiation is formed at the tail end of an antenna radiator, the WiFi radio frequency signal and the GPS radio frequency signal are transmitted rightwards, and are drained to the ground through a grounding point without further transmission rightwards; meanwhile, the LTE radio frequency signal is transmitted to the right, radiation is formed at the tail end of the antenna radiator, and the LTE radio frequency signal is transmitted to the left, is drained to the ground through the grounding point and is not further transmitted to the left. At this time, since the low frequency signal of the LTE rf signal source is not long enough, a tip with a proper length, i.e. f1 in fig. 3, is found. At this moment, the antenna radiator of the smart phone cannot meet the requirement of the low-frequency band signal on the length of the antenna radiator.

In order to solve the above problems, in the embodiments of the present invention, a low-frequency signal f1 of an LTE radio frequency signal source can cross over a grounding point to form an antenna, and meanwhile, signals of the same frequency band of different signal sources on the same radiator can be grounded without mutual interference, so that the requirement of the low-frequency signal of the LTE radio frequency signal source on the length of the antenna radiator can be met while high isolation between the same-frequency signals is ensured.

According to the embodiment of the invention, when the same frequency band signals of different signal sources on the same radiator are drained and grounded without mutual interference and the low-frequency signal can be transmitted across the grounding point in a coupling filtering mode, the self-resonant circuit formed by the devices such as the capacitor and the inductor is used as the grounding device to replace the original grounding point, and the frequency band of the signal allowed to pass through the grounding device is changed by adjusting the equivalent capacitance value and the equivalent inductance value in the self-resonant circuit.

Specifically, the equivalent capacitance value C and the equivalent inductance value L of the grounding device and the natural frequency f of the self-resonant circuit in the grounding device satisfy the frequency formula of the electromagnetic wave radiated by the typical LC oscillating circuit: (2 π f)²LC＝1。

After the frequency band of the signal allowed by the grounding device is determined, the intermediate value of the frequency band is used as the natural frequency f of the self-resonant circuit in the grounding device, so that the product of the equivalent capacitance value C of the grounding device and the equivalent inductance value L of the grounding device can be determined, and further, the capacitor and the inductor in the self-resonant circuit of the grounding device can be continuously debugged, so that the product of the equivalent capacitance value C of the grounding device and the equivalent inductance value of the grounding device meets the condition.

In addition, the radio frequency signal sources appearing in the embodiment of the invention are all signal feed points in the antenna device.

In order to make the objects, technical solutions and advantages of the present invention clearer, the following will describe the present invention in further detail by taking an example that a smart phone is equipped with three radio frequency signal sources of WiFi, GPS and LTE and shares an antenna radiator with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 4, an embodiment of the present invention provides an antenna apparatus, including: at least two signal feeding points 40 and a signal transmission channel 41 corresponding to the signal feeding points 40, an antenna radiator 42 electrically connected to the signal transmission channel 41, and at least one ground device 43; the grounding device 43 is located between the signal feeding points 40 which are connected with the same antenna radiator 42 and have overlapped working frequency bands;

the grounding device 43 is configured to block a partial frequency band signal from being transmitted by the end of the antenna radiator 42 in the direction of the grounding device 43;

wherein, the signal is transmitted by the signal feeding point 40 which is connected with the same antenna radiator 42 and has overlapped working frequency bands.

The antenna device comprises at least two signal feeding points 40, a signal transmission channel 41 corresponding to the signal feeding points 40, an antenna radiator 42 electrically connected with the signal transmission channel 41, and at least one grounding device 43; the grounding device 43 is located between the signal feeding points 40 which are connected with the same antenna radiator 42 and have overlapped working frequency bands; the grounding device 43 is located between the signal feeding points 40 which are connected with the same antenna radiator 42 and have overlapped working frequency bands; the grounding device 43 is configured to block a partial frequency band signal from being transmitted by the end of the antenna radiator 42 in the direction of the grounding device 43; wherein, the signal is transmitted by the signal feeding point 40 which is connected with the same antenna radiator 42 and has overlapped working frequency bands. After the two signal feeding points 40 connected with the same antenna radiator 42 and having overlapped working frequency bands in the antenna device send out radio frequency signals, the set grounding device 43 can guide the radio frequency signals transmitted to the connection point of the grounding device 43 and the antenna radiator 42 into the ground, so that the radio frequency signals sent by the two signal feeding points 40 connected with the same antenna radiator 42 and having overlapped working frequency bands are respectively sent out through the non-overlapped antenna radiator 42, that is, crosstalk between same-frequency signals is avoided.

When the antenna device is installed on a terminal and transmits a low frequency signal through the antenna device, if the operating frequency bands of all the signal feeding points 40 connected to the antenna radiator 42 do not overlap with the frequency band of the low frequency signal feeding point, there is no other signal that interferes with the low frequency signal when the low frequency signal is transmitted on the antenna radiator 42, so that there is no need to provide a grounding device 43 corresponding to the low frequency signal, and since the tip discharge effect of signal transmission, i.e. the signal will select the simplest path to form radiation at the end of the antenna radiator 42 and the radiation efficiency is the highest, and since the lower the frequency band of the signal radiated by the antenna is, the longer the length of the required antenna radiator 42 is, the low frequency signal is preferably radiated at the end of the long side of the antenna radiator, i.e. the low frequency signal is transmitted through the antenna radiator end point on the same side as the grounding device 43, the length of the corresponding antenna radiator 42 of the low, the radiation efficiency is better

For example, as shown in fig. 5, let f1 be a low-frequency rf signal emitted by an LTE rf signal source; f2 is an intermediate frequency radio frequency signal sent by an LTE radio frequency signal source and an intermediate frequency signal sent by a GPS radio frequency signal source; f3 is an intermediate frequency radio frequency signal sent by an LTE radio frequency signal source and a WiFi signal sent by a WiFi radio frequency signal source;

when the antenna device is applied to a smart phone, and the smart phone is provided with three radio frequency signal sources of WiFi, GPS and LTE and shares the antenna radiator 42, since the working frequency band of the WiFi radio frequency signal source overlaps with the high frequency working frequency band of the LTE radio frequency signal source, and the working frequency band of the GPS radio frequency signal source overlaps with the intermediate frequency working frequency band of the LTE radio frequency signal source, the grounding device 43 is arranged to introduce the signal sent by the WiFi radio frequency signal source, the signal sent by the GPS radio frequency signal source and the intermediate and high frequency signal sent by the LTE radio frequency signal source into the ground.

At the moment, the signal (f3) sent by the WiFi radio frequency signal source and the signal (f2) sent by the GPS radio frequency signal source are transmitted leftwards, radiation is formed at the tail end of the antenna radiating body 42, and the signal (f3) sent by the WiFi radio frequency signal source and the signal (f2) sent by the GPS radio frequency signal source are transmitted rightwards, and are guided to the ground through the grounding device 43 and are not further sent rightwards; meanwhile, the medium-high frequency signals (f2& f3) sent by the LTE radio frequency signal source are transmitted to the right, radiation is formed at the tail end of the antenna radiator 42, and when the medium-high frequency signals (f2& f3) sent by the LTE radio frequency signal source are transmitted to the left, the signals are guided to the ground through the grounding device 43 and are not further transmitted to the left. For the low-frequency signal (f1) sent by the LTE rf signal source, because the length from the LTE rf signal source to the right end of the antenna radiator 42 cannot satisfy the requirement of the low-frequency band signal on the length of the antenna radiator 42, and the grounding device 43 does not drain the low-frequency signal sent by the LTE rf signal source to the ground, the low-frequency signal (f1) sent by the LTE rf signal source is emitted from the left end of the antenna radiator 42 toward the grounding device 43 along the antenna radiator 42.

Therefore, when the smart phone is provided with three radio frequency signal sources of WiFi, GPS and LTE and shares the antenna radiator 42, the intermediate frequency radio frequency signal sent by the LTE radio frequency signal source and the intermediate frequency signal sent by the GPS radio frequency signal source with crosstalk, the intermediate frequency radio frequency signal sent by the LTE radio frequency signal source and the WiFi signal sent by the WiFi radio frequency signal source are highly isolated, the antenna radiator 42 of the low frequency radio frequency signal sent by the LTE radio frequency signal source becomes long, and the radiation efficiency is better.

The different methods of constructing the grounding device 43 will be separately described below, taking as an example the case of configuring a smartphone with multiple antennas as shown in fig. 2.

In a first mode, the metal body 430 and the band control unit 431 form the grounding device 43, see fig. 6.

Optionally, the grounding device 43 includes at least one metal body 430 and a frequency band control unit 431;

wherein the metal body 430 and the antenna radiator 42 form a coupling capacitor;

the band control unit 431 is configured to change an equivalent inductance value of the grounding device 43 and/or an equivalent capacitance value of the grounding device 43, so as to change a band range of the blocked signal.

The grounding device 43 in the above antenna device includes at least one metal body 430 and a band control unit 431; the metal body 430 and the antenna radiator 42 form a coupling capacitor, the frequency band control unit 431 is connected in series, when the antenna device transmits a signal, the frequency band control unit 431 changes an equivalent inductance value of the grounding device 43 and/or an equivalent capacitance value of the grounding device 43, so that a natural frequency of a circuit formed by the frequency band control unit 431 and the coupling capacitor is equal to a middle value of a frequency band range of a signal to be blocked, and the grounding device 43 can block the signal of a partial frequency band transmitted from the signal feeding point 40 to the grounding device 43 from being transmitted through the antenna radiator 42.

When the antenna device is applied to a smart phone, three radio frequency signal sources of WiFi, GPS and LTE are sequentially arranged on the antenna radiator 42, and the grounding device 43 is arranged between the GPS radio frequency signal source and the LTE radio frequency signal source, so that when a WiFi radio frequency signal and/or an LTE high frequency radio frequency signal is sent, the inductance-capacitance value of the frequency band control unit is set, the natural frequency of a self-resonant circuit formed by combining the self-resonant circuit with the coupling capacitor is equal to the middle value of the working frequency band range of the WiFi radio frequency signal, and the WiFi radio frequency signal and/or the LTE high frequency radio frequency signal can be guided to the ground through the grounding device 43 when reaching the connection point of the antenna radiator 42 and the grounding device 43, namely, the crosstalk between the WiFi radio frequency signal and the LTE high frequency radio frequency signal is avoided;

when the GPS radio frequency signal and/or the LTE intermediate frequency radio frequency signal are transmitted in the same manner, the inductance-capacitance value of the frequency band control unit is set so that the natural frequency of the self-resonant circuit formed by combining the self-resonant circuit with the coupling capacitor is equal to the middle value of the working frequency band range of the GPS radio frequency signal, so that the GPS radio frequency signal and/or the LTE intermediate frequency radio frequency signal can be guided to the ground through the grounding device 43 when reaching the connection point of the antenna radiator 42 and the grounding device 43, that is, the crosstalk between the GPS radio frequency signal and the LTE intermediate frequency radio frequency signal is avoided;

for LTE low-frequency radio frequency signals, no processing is carried out; at this time, when the LTE low-frequency radio frequency signal is transmitted along the antenna radiator 42, the LTE low-frequency radio frequency signal directly passes through a connection point between the antenna radiator 42 and the grounding device 43, reaches the end of the antenna radiator 42 in the direction of the grounding device 43, and is transmitted, and compared with the conventional LTE low-frequency radio frequency signal which is not transmitted through a connection point between the antenna radiator 42 and the grounding device 43, the length of the antenna radiator 42 through which the LTE low-frequency radio frequency signal is transmitted in the embodiment of the present invention is increased, and the radiation efficiency is.

In a specific implementation, the metal body 430 is not in contact with the antenna radiator 42, so that the metal body 430 and the antenna radiator 42 can form a coupling capacitor.

The equivalent inductance of the grounding device 43 corresponds to the inductance of the band control unit 431.

The equivalent capacitance of the grounding device 43 is equal to the sum of the capacitance of the coupling capacitor formed by the metal body 430 and the antenna radiator 42 and the capacitance of the band control unit 431.

For example, the smart phone chip monitors the current application scene in real time, determines that the current operating environment of the smart phone is that the GPS radio frequency signal source sends a radio frequency signal, and because the intermediate frequency f of the existing GPS radio frequency signal is 1575.42MHz, the frequency formula (2 pi f) of the electromagnetic wave radiated by the typical LC oscillating circuit is used²When LC is 1, the product of the equivalent inductance L of the grounding device 43 and the equivalent capacitance C of the grounding device 43 is:

during the process, the smart phone can send out the GPS signal sent by the GPS rf signal source from the left end of the antenna radiator 42, and the rf signal transmitted rightward along the antenna radiator 42 is guided to the ground through the grounding device 43 and is not transmitted rightward when reaching the connection point of the grounding device 43.

Further, the ground device 43 may be further divided according to the frequency band control unit 431.

As shown in fig. 7, the grounding device 43 includes a metal body 430; the frequency band control unit 431 comprises a multi-control switch 4310 and a frequency band limiting device 4311 connected with the ground;

the multi-control switch 4310 is used to connect the metal body 430 to the band limiting device 4311 or to ground the metal body 430.

The grounding device 43 of the antenna device includes a metal body 430, and the metal body 430 and the antenna radiator 42 form a coupling capacitor; and the frequency band control unit 431 is composed of a multi-control switch 4310 and a frequency band limiting device 4311 connected with the ground; wherein the one end is connected to the metal body 430 and the multi-control switch 4310 is used for communicating the metal body 430 with the band limiting device 4311 or grounding the metal body 430. In this way, when signals with different frequencies need to be blocked and transmitted to the grounding device 43 through the antenna radiator 42, the chip controls the multi-control switch 4310 to access the frequency band limiting device 4311 corresponding to the signal frequency band or directly ground, so that the natural frequency of the circuit formed by the frequency band limiting device 4311 and the coupling capacitor is equal to the middle value of the frequency band range of the signals needing to be blocked, and the purpose of blocking the signals from being transmitted to the grounding device 43 through the antenna radiator 42 is achieved.

When the antenna device is applied to a smart phone, three radio frequency signal sources of WiFi, GPS and LTE are sequentially arranged on the antenna radiator 42, and the grounding device 43 is arranged between the GPS radio frequency signal source and the LTE radio frequency signal source, so that when a WiFi radio frequency signal and/or an LTE high-frequency radio frequency signal are sent, a single-pole double-throw switch of a system chip of the smart phone is connected to the frequency band limiting device 4311 which can enable the grounding device 43 to pass through the high-frequency signal, and thus the WiFi radio frequency signal and/or the LTE high-frequency radio frequency signal can be guided to the ground through the grounding device 43 when reaching the connection point of the antenna radiator 42 and the grounding device 43, and the crosstalk between the WiFi radio frequency signal and the LTE high-frequency radio frequency signal is avoided;

similarly, when sending the GPS radio frequency signal and/or the LTE intermediate frequency radio frequency signal, the smartphone system chip connects the single-pole double-throw switch to the frequency band limiting device 4311 that enables the grounding device 43 to pass through the high frequency signal, so that the GPS radio frequency signal and/or the LTE intermediate frequency radio frequency signal can be guided to the ground through the grounding device 43 when reaching the connection point between the antenna radiator 42 and the grounding device 43, that is, crosstalk between the GPS radio frequency signal and the LTE intermediate frequency radio frequency signal is avoided;

In particular, the band limiting device 4311 comprises a capacitor and/or at least one inductor.

In a specific implementation, the band limiting device 4311 may be formed by only an inductor, such that the coupling capacitor formed by the metal body 430 and the antenna radiator 42 may form a self-resonant circuit in combination with the inductor in the band limiting device 4311, and after the capacitance value of the coupling capacitor formed by the metal body 430 and the antenna radiator 42 is determined, the chip controls the multi-control switch 4310 to select a different band limiting device 4311 to change the product of the equivalent inductance value of the grounding device 43 and the equivalent capacitance value of the grounding device 43, so that the grounding device 43 may pass radio frequency signals of different frequencies.

In a specific implementation, the band limiting device 4311 may also be formed by only a capacitor, so that the coupling capacitor formed by the metal body 430 and the antenna radiator 42 and the capacitor in the band limiting device 4311 together form an equivalent capacitor of the grounding device 43. At this time, the equivalent inductance value of the grounding device 43 is zero, and the product of the equivalent capacitance value of the grounding device 43 and the equivalent inductance value of the grounding device 43 is approximately zero, and the frequency formula of the electromagnetic wave radiated from the typical LC oscillating circuit is satisfied according to the natural frequency f of the self-resonant circuit in the grounding device 43: (2 π f)²LC is 1, and in this case, after the coupling capacitance formed by the metal body 430 and the antenna radiator 42 is combined with the band limiting device 4311, the grounding device 43 can only be passed throughAn over-high frequency signal.

In addition, the band limiting device 4311 may also be formed by a combination of a capacitor and an inductor, and in this case, the coupling capacitor formed by the metal body 430 and the antenna radiator 42 and the capacitor of the band limiting device 4311 together form an equivalent capacitor of the grounding device 43. At this time, the coupling capacitor formed by the metal body 430 and the antenna radiator 42, the capacitor in the band limiting device 4311, and the inductor in the band limiting device 4311 form a self-resonant circuit, so that after the capacitance value of the coupling capacitor formed by the metal body 430 and the antenna radiator 42 is determined, the multi-control switch 4310 is controlled by the chip to select a different band limiting device 4311 to change the product of the equivalent inductance value of the grounding device 43 and the equivalent capacitance value of the grounding device 43, so that the grounding device 43 can pass radio frequency signals with different frequencies.

(II) as shown in FIG. 8, the grounding device 43 comprises at least two metal bodies 430;

the frequency band control unit 431 comprises at least one frequency band limiting device 4311, one end of the frequency band limiting device 4311 is grounded, and the other end is connected with the metal body 430;

different metal bodies 430 are connected with different frequency band limiting devices 4311, and the number of the frequency band limiting devices 4311 is not more than that of the metal bodies 430;

the metal body 430 not connected to the band limiting device 4311 is grounded.

The grounding device 43 in the above antenna device comprises at least two metal bodies 430, and the frequency band control unit 431 comprises at least one frequency band limiting device 4311, wherein one end of the frequency band limiting device 4311 is grounded, and the other end is connected with the metal bodies 430; different metal bodies 430 are connected with different frequency band limiting devices 4311, and the number of the frequency band limiting devices 4311 is not more than that of the metal bodies 430; the metal body 430 of the unconnected band limiting device 4311 is grounded. In this way, the grounding device 43 includes at least one self-resonant circuit formed by a coupling capacitor and different band limiting devices 4311, wherein the natural frequency of each self-resonant circuit is equal to the middle value of the frequency band range corresponding to a signal to be blocked, so that the purpose of blocking the signal from being transmitted toward the grounding device 43 through the antenna radiator 42 can be achieved.

When the antenna device is applied to a smart phone, three radio frequency signal sources of WiFi, GPS and LTE are sequentially arranged on the antenna radiator 42, the grounding device 43 is arranged between the GPS radio frequency signal source and the LTE radio frequency signal source, the grounding device 43 comprises two grounded paths, one of the grounded paths can pass through WiFi radio frequency signals and/or LTE high-frequency radio frequency signals, and the other grounded path can pass through GPS radio frequency signals and/or LTE intermediate-frequency radio frequency signals. Therefore, when the WiFi radio frequency signal and/or the LTE high frequency radio frequency signal are transmitted, and the WiFi radio frequency signal and/or the LTE high frequency radio frequency signal reach the connection point between the antenna radiator 42 and the grounding device 43, the WiFi radio frequency signal and/or the LTE high frequency radio frequency signal can be guided to the ground through the grounding path in the grounding device 43, that is, the crosstalk between the WiFi radio frequency signal and the LTE high frequency radio frequency signal is avoided;

similarly, when the GPS radio frequency signal and/or the LTE intermediate frequency radio frequency signal are transmitted, when the GPS radio frequency signal and/or the LTE intermediate frequency radio frequency signal reach the connection point between the antenna radiator 42 and the grounding device 43, the GPS radio frequency signal and/or the LTE intermediate frequency radio frequency signal can be guided to the ground through the grounding path in the grounding device 43, that is, crosstalk between the GPS radio frequency signal and the LTE intermediate frequency radio frequency signal is avoided;

for LTE low frequency rf signals, no ground path in the grounding device 43 can pass low frequency signals; at this time, when the LTE low-frequency radio frequency signal is transmitted along the antenna radiator 42, the LTE low-frequency radio frequency signal directly passes through a connection point between the antenna radiator 42 and the grounding device 43, reaches the end of the antenna radiator 42 in the direction of the grounding device 43, and is transmitted, and compared with the conventional LTE low-frequency radio frequency signal which is not transmitted through a connection point between the antenna radiator 42 and the grounding device 43, the length of the antenna radiator 42 through which the LTE low-frequency radio frequency signal is transmitted in the embodiment of the present invention is increased, and the radiation efficiency is.

In particular, the band limiting device 4311 comprises at least one capacitor and/or at least one inductor.

In a specific implementation, the band limiting device 4311 may be formed by only an inductor, so that a self-resonant circuit may be formed by combining the coupling capacitor formed by the metal body 430 and the antenna radiator 42 with the inductor in the band limiting device 4311, and after the capacitance value of the coupling capacitor formed by the metal body 430 and the antenna radiator 42 is determined, different metal bodies 430 are combined with different band limiting devices 4311, so that the grounding device 43 may pass radio frequency signals with different frequencies.

In a specific implementation, the band limiting device 4311 may also be formed by only a capacitor, so that the coupling capacitor formed by the metal body 430 and the antenna radiator 42 and the capacitor in the band limiting device 4311 together form an equivalent capacitor of the grounding device 43. At this time, the equivalent inductance value of the grounding device 43 is zero, and the product of the equivalent capacitance value of the grounding device 43 and the equivalent inductance value of the grounding device 43 is approximately zero, and the frequency formula of the electromagnetic wave radiated from the typical LC oscillating circuit is satisfied according to the natural frequency f of the self-resonant circuit in the grounding device 43: (2 π f)²As can be seen from LC — 1, in this case, the metal body 430 is combined with the coupling capacitor formed by the antenna radiator 42 and the band limiting device 4311, and the ground device 43 can pass only high-frequency signals.

In addition, the band limiting device 4311 may also be formed by a combination of a capacitor and an inductor, and in this case, the coupling capacitor formed by the metal body 430 and the antenna radiator 42 and the capacitor of the band limiting device 4311 together form an equivalent capacitor of the grounding device 43. At this time, the coupling capacitance formed by the metal body 430 and the antenna radiator 42, the capacitance in the band limiting device 4311 and the inductance in the band limiting device 4311 form a self-resonant circuit, and the combination of different metal bodies 430 and different band limiting devices 4311 can make the grounding device 43 pass radio frequency signals of different frequencies.

In a second mode, the grounding device 43 is formed by the capacitor 432 and the band control unit 431, see fig. 9.

Optionally, the grounding device 43 includes at least one capacitor 432 and a frequency band control unit 431;

one end of the capacitor 432 is electrically connected to the antenna radiator 42, and the other end is connected to the frequency band control unit 431;

The grounding means 43 in the above antenna device comprises at least one capacitor 432 and a band control unit 431; when the antenna device transmits a signal, the frequency band control unit 431 changes the equivalent inductance value of the grounding device 43 and/or the equivalent capacitance value of the grounding device 43, so that the natural frequency of the circuit formed by the frequency band control unit 431 and the capacitor 432 is equal to the middle value of the frequency band range of the signal to be blocked, and the signal of a partial frequency band transmitted from the signal feeding point 40 to the grounding device 43 can be blocked by the grounding device 43 and transmitted through the antenna radiator 42.

When the antenna device is applied to a smart phone, three radio frequency signal sources of WiFi, GPS and LTE are sequentially arranged on the antenna radiator 42, and the grounding device 43 is arranged between the GPS radio frequency signal source and the LTE radio frequency signal source, so that when a WiFi radio frequency signal and/or an LTE high frequency radio frequency signal is sent, the inductance-capacitance value of the frequency band control unit is set, the natural frequency of a self-resonant circuit formed by combining the self-resonant circuit with the capacitor 432 is equal to the middle value of the working frequency band range of the WiFi radio frequency signal, and the WiFi radio frequency signal and/or the LTE high frequency radio frequency signal can be guided to the ground through the grounding device 43 when reaching the connection point of the antenna radiator 42 and the grounding device 43, namely, the crosstalk between the WiFi radio frequency signal and the LTE high frequency radio frequency signal is avoided;

when the GPS radio frequency signal and/or the LTE intermediate frequency radio frequency signal are transmitted in the same manner, the inductance-capacitance value of the frequency band control unit is set so that the natural frequency of the self-resonant circuit formed by combining the frequency band control unit with the capacitor 432 is equal to the middle value of the working frequency band range of the GPS radio frequency signal, so that the GPS radio frequency signal and/or the LTE intermediate frequency radio frequency signal can be guided to the ground through the grounding device 43 when reaching the connection point of the antenna radiator 42 and the grounding device 43, that is, the crosstalk between the GPS radio frequency signal and the LTE intermediate frequency radio frequency signal is avoided;

For example, the smart phone chip monitors the current application scene in real time, determines that the current operating environment of the smart phone is that the WiFi radio frequency signal source sends a radio frequency signal, and because the intermediate frequency f of the existing GPS radio frequency signal is 2.4GHz, the frequency formula (2 pi f) of the electromagnetic wave radiated by the typical LC oscillating circuit is used as the basis²When LC is 1, the product of the equivalent inductance L of the grounding device 43 and the equivalent capacitance C of the grounding device 43 is:

during the process, the WiFi signal sent by the WiFi radio frequency signal source of the smart phone can be sent out from the left end of the antenna radiator 42, and the radio frequency signal transmitted rightward along the antenna radiator 42 is guided to the ground through the grounding device 43 and is not transmitted rightward when reaching the connection point of the grounding device 43.

Accordingly, the ground device 43 may be further divided according to the frequency band control unit 431.

As shown in fig. 10, the grounding device 43 includes a capacitor 432;

the frequency band control unit 431 comprises a multi-control switch 4310 and a frequency band limiting device 4311 connected with the ground;

the multi-control switch 4310 is used to connect the capacitor 432 with the band limiting device 4311 or ground the capacitor.

The grounding device 43 in the antenna device includes a capacitor 432, one end of the capacitor 432 is electrically connected to the antenna radiator 42, and the other end is connected to the frequency band control unit 431; meanwhile, the frequency band control unit 431 is composed of a multi-control switch 4310 and a frequency band limiting device 4311 connected with the ground; wherein the multi-control switch 4310 is connected to a capacitor 432 and is used to connect the capacitor 432 to the band limiting device 4311 or ground the capacitor. In this way, when signals with different frequencies need to be blocked and transmitted to the grounding device 43 through the antenna radiator 42, the chip-controlled multi-control switch 4310 may be connected to the frequency band limiting device 4311 corresponding to the signal frequency band or directly grounded, so that the natural frequency of the self-resonant circuit formed by the frequency band limiting device 4311 and the capacitor 432 is equal to the middle value of the frequency band range of the signals needing to be blocked, and the purpose of blocking the signals from being transmitted to the grounding device 43 through the antenna radiator 42 is achieved.

When the antenna device is applied to a smart phone, three radio frequency signal sources of WiFi, GPS and LTE are sequentially arranged on the antenna radiator 42, and the grounding device 43 is arranged between the GPS radio frequency signal source and the LTE radio frequency signal source, so that when a WiFi radio frequency signal and/or an LTE high-frequency radio frequency signal are sent, the multi-control switch is connected to the frequency band limiting device 4311 which can enable the grounding device 43 to pass through the high-frequency signal by the smart phone system chip, and thus the WiFi radio frequency signal and/or the LTE high-frequency radio frequency signal can be guided to the ground through the grounding device 43 when reaching the connection point of the antenna radiator 42 and the grounding device 43, namely, the crosstalk between the WiFi radio frequency signal and the LTE high-frequency radio frequency signal is avoided;

similarly, when the GPS radio frequency signal and/or the LTE intermediate frequency radio frequency signal are transmitted, the smartphone system chip connects the multi-control switch to the frequency band limiting device 4311 that enables the grounding device 43 to pass through the high frequency signal, so that the GPS radio frequency signal and/or the LTE intermediate frequency radio frequency signal can be guided to the ground through the grounding device 43 when reaching the connection point of the antenna radiator 42 and the grounding device 43, that is, crosstalk between the GPS radio frequency signal and the LTE intermediate frequency radio frequency signal is avoided;

Optionally, the band limiting device 4311 comprises a capacitor and/or at least one inductor.

In a specific implementation, the band limiting device 4311 may be formed by only an inductor, such that the capacitor 432 connected to the antenna radiator and the inductor in the band limiting device 4311 are combined to form a self-resonant circuit, and after the capacitance value of the capacitor 432 is determined, the product of the equivalent inductance value of the grounding device 43 and the equivalent capacitance value of the grounding device 43 may be changed by selecting different band limiting devices 4311 through the chip-controlled multi-switch 4310, so that the grounding device 43 may pass radio frequency signals of different frequencies.

In a specific implementation, the band limiting device 4311 may also be formed by only a capacitor, so that the coupling capacitor formed by the metal body 430 and the antenna radiator 42 and the capacitor in the band limiting device 4311 together form an equivalent capacitor of the grounding device 43. At this time, the equivalent inductance value of the grounding device 43 is zero, and the product of the equivalent capacitance value of the grounding device 43 and the equivalent inductance value of the grounding device 43 is approximately zero, and the frequency formula of the electromagnetic wave radiated from the typical LC oscillating circuit is satisfied according to the natural frequency f of the self-resonant circuit in the grounding device 43: (2 π f)²LC ═ 1, so that the grounding device 43 can only pass high-frequency signals after the combination of the capacitor 432 and the band limiting element 4311.

In addition, the band limiting device 4311 may also be formed by a combination of a capacitor and an inductor, and in this case, the capacitor 432 connected to the antenna radiator and the capacitor in the band limiting device 4311 together form an equivalent capacitor of the grounding device 43. At this time, the capacitor 432 connected to the antenna radiator, the capacitor in the band limiting device 4311 and the inductor in the band limiting device 4311 form a self-resonant circuit, so that the product of the equivalent inductance value of the grounding device 43 and the equivalent capacitance value of the grounding device 43 can be changed by selecting different band limiting devices 4311 through the chip-controlled multi-switch 4310, so that the grounding device 43 can pass radio frequency signals with different frequencies.

(II) as shown in FIG. 11, the grounding device 43 comprises at least two capacitors 432;

the frequency band control unit 431 comprises at least one frequency band limiting device 4311, one end of the frequency band limiting device 4311 is grounded, and the other end is connected with the capacitor 432;

different capacitors 432 are connected with different frequency band limiting devices 4311, and the number of the frequency band limiting devices 4311 is not greater than the number of the capacitors 432;

the capacitor 432 not connected to the band limiting device 4311 is grounded.

The grounding device 43 in the antenna device includes at least a capacitor 432 connected to the antenna radiator 42, and the frequency band control unit 431 includes at least one frequency band limiting device 4311, where one end of the frequency band limiting device 4311 is grounded and the other end is connected to the capacitor 432; different capacitors 432 are connected with different frequency band limiting devices 4311, and the number of the frequency band limiting devices 4311 is not greater than the number of the capacitors 432; the capacitance of the unconnected band limiting device 4311 is grounded. In this way, the grounding device 43 includes at least one self-resonant circuit formed by different capacitors 432 and different band limiting devices 4311, wherein the natural frequency of each self-resonant circuit corresponds to the middle value of the frequency band range of a signal to be blocked, so that the purpose of blocking the signal from being transmitted toward the grounding device 43 through the antenna radiator 42 can be achieved.

In a specific implementation, the band limiting device 4311 may be formed by only an inductor, so that a combination of a capacitor connected to the antenna radiator 42 and an inductor in the band limiting device 4311 may form a self-resonant circuit, and after the capacitance value of the capacitor 432 connected to the antenna radiator 42 is determined, the capacitor 432 connected to the antenna radiator 42 is combined with a different band limiting device 4311, so that the grounding device 43 may pass radio frequency signals with different frequencies.

In a specific implementation, the band limiting device 4311 may also be formed by only a capacitor, so that the coupling capacitor formed by the metal body 430 and the antenna radiator 42 and the capacitor in the band limiting device 4311 together form an equivalent capacitor of the grounding device 43. At this time, the equivalent inductance value of the grounding device 43 is zero, and the product of the equivalent capacitance value of the grounding device 43 and the equivalent inductance value of the grounding device 43 is approximately zero, so that the radiation power of the typical LC oscillating circuit is satisfied according to the natural frequency f of the self-resonant circuit in the grounding device 43Frequency formula of magnetic wave: (2 π f)²LC ═ 1, in which case the capacitor 432 is combined with the band limiting device 4311, and the grounding device 43 can pass only high-frequency signals.

In addition, the band limiting device 4311 may also be formed by a combination of a capacitor and an inductor, and in this case, the capacitor 432 connected to the antenna radiator 42 and the capacitor of the band limiting device 4311 together form an equivalent capacitor of the grounding device 43. At this time, the capacitor 432 connected to the antenna radiator 42, the capacitor in the band limiting device 4311, and the inductor in the band limiting device 4311 form a self-resonant circuit, and the combination of the different capacitors 432 connected to the antenna radiator 42 and the different band limiting devices 4311 can make the grounding device 43 pass radio frequency signals of different frequencies.

In a third mode, the grounding device 43 is formed by an inductor 433 and a band control unit 431, see fig. 12.

Optionally, the grounding device 43 includes at least one inductor 433 and a frequency band control unit 431;

one end of the inductor 433 is electrically connected to the antenna radiator 42, and the other end is connected to the frequency band control unit 431;

the band control unit 431 is configured to change an equivalent capacitance value of the grounding device 43 and/or an equivalent inductance value of the grounding device 43, so as to change a band range of the blocked signal.

The grounding device 43 in the antenna device comprises at least one inductor 433 and a frequency band control unit 431; when the antenna device transmits a signal, the frequency band control unit 431 changes an equivalent capacitance value of the grounding device 43 and/or an equivalent inductance value of the grounding device 43, so that the natural frequency of the self-resonant circuit formed by the frequency band control unit 431 and the inductor 433 is equal to the middle value of the frequency band range of the signal to be blocked, and the signal of a partial frequency band transmitted from the signal feeding point 40 to the grounding device 43 can be blocked by the grounding device 43 and transmitted through the antenna radiator 42.

When the antenna device is applied to a smart phone, three radio frequency signal sources of WiFi, GPS and LTE are sequentially arranged on the antenna radiator 42, and the grounding device 43 is arranged between the GPS radio frequency signal source and the LTE radio frequency signal source, so that when a WiFi radio frequency signal and/or an LTE high frequency radio frequency signal is sent, the inductance-capacitance value of the frequency band control unit is set, the natural frequency of a self-resonant circuit formed by combining the self-resonant circuit with the inductor 433 is equal to the middle value of the working frequency band range of the WiFi radio frequency signal, and the WiFi radio frequency signal and/or the LTE high frequency radio frequency signal can be guided to the ground through the grounding device 43 when reaching the connection point of the antenna radiator 42 and the grounding device 43, namely, the crosstalk between the WiFi radio frequency signal and the LTE high frequency radio frequency signal is avoided;

when the GPS radio frequency signal and/or the LTE intermediate frequency radio frequency signal are transmitted in the same manner, the inductance-capacitance value of the frequency band control unit is set so that the natural frequency of the self-resonant circuit formed by combining the inductance 433 is equal to the middle value of the working frequency band range of the GPS radio frequency signal, so that the GPS radio frequency signal and/or the LTE intermediate frequency radio frequency signal can be guided to the ground through the grounding device 43 when reaching the connection point between the antenna radiator 42 and the grounding device 43, that is, crosstalk between the GPS radio frequency signal and the LTE intermediate frequency radio frequency signal is avoided;

As shown in fig. 13, the grounding device 43 includes an inductor 433;

the multi-control switch 4310 is used to connect the inductor 433 with the band limiting device 4311 or to ground the inductor.

The grounding device 43 in the antenna device includes an inductor 433, one end of the inductor 433 is electrically connected to the antenna radiator 42, and the other end is connected to the frequency band control unit 431; meanwhile, the frequency band control unit 431 is composed of a multi-control switch 4310 and a frequency band limiting device 4311 connected with the ground; the multi-control switch 4310 is connected to the inductor 433 and is used to connect the inductor 433 to the band limiting device 4311 or to ground the inductor 433. In this way, when signals with different frequencies need to be blocked and transmitted to the grounding device 43 through the antenna radiator 42, the chip-controlled multi-control switch 4310 may be connected to the frequency band limiting device 4311 corresponding to the signal frequency band or directly grounded, so that the natural frequency of the self-resonant circuit formed by the frequency band limiting device 4311 and the inductor 433 is equal to the middle value of the frequency band range of the signals that need to be blocked, and the purpose of blocking the signals from being transmitted to the grounding device 43 through the antenna radiator 42 is achieved.

In a specific implementation, the band limiting device 4311 may be formed by a capacitor, such that the inductor 433 connected to the antenna radiator and the capacitor in the band limiting device 4311 are combined to form a self-resonant circuit, and after the inductance value of the inductor 433 is determined, the product of the equivalent capacitance value of the grounding device 43 and the equivalent inductance value of the grounding device 43 may be changed by selecting different band limiting devices 4311 through the chip-controlled multi-switch 4310, so that the grounding device 43 may pass radio frequency signals of different frequencies.

In a specific implementation, the band limiting device 4311 may also be formed by only an inductor, so that the inductor 433 and the inductor in the band limiting device 4311 together form an equivalent inductor of the grounding device. At this time, the equivalent capacitance value of the grounding device is zero, and the product of the equivalent capacitance value of the grounding device and the equivalent inductance value of the grounding device is approximately zero, so that the frequency formula of the electromagnetic wave radiated by the typical LC oscillating circuit is satisfied according to the natural frequency f of the self-resonant circuit in the grounding device: (2 π f)²LC ═ 1, it is known that, after the combination of the inductance 433 and the band limiting device 4311, the grounding device can only pass high-frequency signals.

In addition, the band limiting device 4311 may be formed by a combination of only an inductor and a capacitor, and in this case, the inductor 433 connected to the antenna radiator and the inductor in the band limiting device 4311 together form an equivalent inductor of the grounding device 43. At this time, the inductor 433 connected to the antenna radiator, the inductor in the band limiting device 4311, and the capacitor in the band limiting device 4311 form a self-resonant circuit, so that the product of the equivalent capacitance of the grounding device 43 and the equivalent inductance of the grounding device 43 can be changed by selecting different band limiting devices 4311 through the chip-controlled multi-switch 4310, so that the grounding device 43 can pass radio frequency signals with different frequencies.

(II) as shown in FIG. 14, the grounding device 43 comprises at least two inductors 433;

the frequency band control unit 431 comprises at least one frequency band limiting device 4311, one end of the frequency band limiting device 4311 is grounded, and the other end is connected with an inductor 433;

different inductors 433 are connected with different frequency band limiting devices 4311, and the number of the frequency band limiting devices 4311 is not more than the number of the inductors 433;

the inductance 433 of the band limiting device 4311 is not connected to ground.

The grounding device 43 in the antenna apparatus includes at least an inductor 433 connected to the antenna radiator 42, and the frequency band control unit 431 includes at least one frequency band limiting device 4311, where one end of the frequency band limiting device 4311 is grounded and the other end is connected to the inductor 433; different inductors 433 are connected with different frequency band limiting devices 4311, and the number of the frequency band limiting devices 4311 is not more than the number of the inductors 433; the inductance of the unconnected band limiting device 4311 is grounded. In this way, the grounding device 43 includes at least one self-resonant circuit formed by different inductors 433 and different band limiting devices 4311, wherein the natural frequency of each self-resonant circuit corresponds to the middle value of the frequency band range of a signal to be blocked, so that the purpose of blocking the signal from being transmitted toward the grounding device 43 through the antenna radiator 42 can be achieved.

In a specific implementation, the band limiting device 4311 may be formed by only a capacitor, so that the inductor connected to the antenna radiator 42 and the capacitor in the band limiting device 4311 may be combined to form a self-resonant circuit, and after the inductance value of the inductor 433 connected to the antenna radiator 42 is determined, the inductor 433 connected to different antenna radiators 42 and different band limiting devices 4311 are combined, so that the grounding device 43 may pass radio frequency signals with different frequencies.

In a specific implementation, the band limiting device 4311 may also be formed by only an inductor, such that the inductor 433 and the inductor in the band limiting device 4311The combination together constitutes the equivalent inductance of the grounding device. At this time, the equivalent capacitance value of the grounding device is zero, and the product of the equivalent capacitance value of the grounding device and the equivalent inductance value of the grounding device is approximately zero, so that the frequency formula of the electromagnetic wave radiated by the typical LC oscillating circuit is satisfied according to the natural frequency f of the self-resonant circuit in the grounding device: (2 π f)²LC ═ 1, in which case the inductance 433 and the band limiting device 4311 are combined, the grounding device can only pass high-frequency signals.

In addition, the band limiting device 4311 may also be formed by a combination of an inductor and a capacitor, in which case the inductor 433 connected to the antenna radiator 42 and the inductor of the band limiting device 4311 together form an equivalent inductor of the grounding device 43. At this time, the inductor 433 connected to the antenna radiator 42 and the inductor in the band limiting device 4311 and the capacitor in the band limiting device 4311 form a self-resonant circuit, and the combination of the inductor 433 connected to the antenna radiator 42 and the band limiting device 4311 can allow the grounding device 43 to pass radio frequency signals of different frequencies.

In a fourth mode, as shown in fig. 15, the grounding device 43 includes a multi-control switch 4310 and a band limiting device 4311 connected to at least one ground;

the multi-control switch 4310 is configured to connect the band limiting device 4311 corresponding to the signal to be blocked with the antenna radiator 42, and disconnect the remaining band limiting devices 4311 from the antenna radiator 42.

In a specific implementation, the grounding device 43 in the antenna apparatus includes a multi-control switch 4310 and a band limiting device 4311 connected to at least one ground, and the switch connects the band limiting device 4311 corresponding to the signal to be blocked with the antenna radiator 42 and disconnects the remaining band limiting devices 4311 from the antenna radiator 42 according to the operating frequency of the signal to be blocked. In this way, the antenna radiator 42 is grounded through the band limiting device 4311 corresponding to the signal to be blocked, which is introduced into the ground via the grounding device 43 when the signal to be blocked is transmitted to the connection point between the grounding device 43 and the antenna radiator 42.

When the antenna device is applied to a smart phone, three radio frequency signal sources of WiFi, GPS and LTE are sequentially arranged on an antenna radiator 42, the grounding device 43 is arranged between the GPS radio frequency signal source and the LTE radio frequency signal source, and the grounding device 43 is directly composed of a single-pole double-throw switch and a frequency band limiting device 4311 connected with two grounds; therefore, when a WiFi radio frequency signal and/or an LTE high frequency radio frequency signal is sent, the smartphone system chip is connected to the single-pole double-throw switch to enable the grounding device 43 to pass through the frequency band limiting device 4311 of the high frequency signal, so that the WiFi radio frequency signal and/or the LTE high frequency radio frequency signal can be guided to the ground through the grounding device 43 when reaching the connection point of the antenna radiator 42 and the grounding device 43, that is, crosstalk between the WiFi radio frequency signal and the LTE high frequency radio frequency signal is avoided;

similarly, when the GPS radio frequency signal and/or the LTE intermediate frequency radio frequency signal are transmitted, the smart phone system chip connects the single-pole double-throw switch to the frequency band limiting device 4311 which enables the grounding device 43 to pass through the high frequency signal, so that the GPS radio frequency signal and/or the LTE intermediate frequency radio frequency signal can be guided to the ground through the grounding device 43 when reaching the connection point of the antenna radiator 42 and the grounding device 43, that is, crosstalk between the GPS radio frequency signal and the LTE intermediate frequency radio frequency signal is avoided;

In a specific implementation, the band limiting device 4311 may be formed by only a capacitor, such that the capacitor in the band limiting device 4311 is an equivalent capacitor of the grounding device, and at this time, the multi-control switch 4310 controls the antenna radiator 42 and only the chipAfter the band limiting device 4311 formed by the capacitor is connected, at this time, the equivalent inductance value of the grounding device is zero, and at this time, the product of the equivalent capacitance value of the grounding device and the equivalent inductance value of the grounding device is approximately zero, and according to the natural frequency f of the self-resonant circuit in the grounding device, the frequency formula of the electromagnetic wave radiated by the typical LC oscillating circuit is satisfied: (2 π f)²LC ═ 1, where the grounding device can only pass high frequency signals.

In a specific implementation, the band limiting device 4311 may also be formed by only an inductor, so that the inductor in the band limiting device 4311 is an equivalent inductor of the grounding device. At this time, when the multi-control switch 4310 connects the antenna radiator 42 with the band limiting device 4311 composed of only the inductance structure under the control of the chip, the equivalent capacitance of the grounding device is zero, so the product of the equivalent capacitance of the grounding device and the equivalent inductance of the grounding device is approximately zero, and the frequency formula of the electromagnetic wave radiated by the typical LC oscillating circuit is satisfied according to the natural frequency f of the self-resonant circuit in the grounding device 43: (2 π f)²LC ═ 1, in which case the inductance 433 and the band limiting device 4311 are combined, the grounding device can only pass high-frequency signals.

In addition, the band limiting device 4311 may also be formed by a combination of an inductor and a capacitor. When the multi-control switch 4310 is controlled by a chip to connect the antenna radiator 42 with the band limiting device 4311, the capacitor in the band limiting device 4311 and the inductor in the band limiting device 4311 form a self-resonant circuit, at this time, all the inductors of the band limiting device 4311 together form an equivalent inductor of the grounding device 43, and all the capacitors of the band limiting device 4311 together form an equivalent capacitor of the grounding device 43. At this time, according to the frequency formula of the electromagnetic wave radiated from the typical LC oscillating circuit, which is satisfied by the natural frequency f of the self-resonant circuit in the grounding device: (2 π f)²LC-1 may determine a frequency band of a signal that the grounding device 43 may pass, and different frequency band limiting devices 4311 may enable the grounding device 43 to pass radio frequency signals of different frequencies.

In addition, in the specific implementation, the multi-control switch used in the embodiment of the present invention may be a single-pole double-throw switch, a relay, or the like.

The embodiment of the invention also provides a terminal which comprises at least one antenna device.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. An antenna device, comprising: the antenna comprises at least two signal feed points, a signal transmission channel corresponding to the signal feed points, an antenna radiator electrically connected with the signal transmission channel, and at least one grounding device; the grounding device is positioned between signal feed points which are connected with the same antenna radiator and have overlapped working frequency bands;

2. The antenna device according to claim 1, wherein the grounding means comprises at least one metal body and a band control unit;

the metal body and the antenna radiator form a coupling capacitor;

3. The antenna device of claim 2, wherein said grounding means comprises a metal body;

4. The antenna device according to claim 2, characterized in that the grounding means comprises at least two metal bodies;

the metal body not connected to the band limiting device is grounded.

5. The antenna device of claim 1, wherein said grounding means comprises at least one capacitor and frequency band control unit; one end of the capacitor is electrically connected with the antenna radiator, and the other end of the capacitor is connected with the frequency band control unit; the frequency band control unit is used for changing an equivalent inductance value of the grounding device and/or an equivalent capacitance value of the grounding device so as to change the frequency band range of the blocked signals; or

The grounding device comprises at least one inductor and a frequency band control unit; one end of the inductor is electrically connected with the antenna radiator, and the other end of the inductor is connected with the frequency band control unit; the frequency band control unit is used for changing an equivalent inductance value of the grounding device and/or an equivalent capacitance value of the grounding device so as to change the frequency band range of the blocked signals.

6. The antenna device of claim 5, wherein said grounding means comprises a capacitor; the frequency band control unit comprises a multi-control switch and a frequency band limiting device connected with the ground; the multi-control is used for communicating the capacitor with the frequency band limiting device or grounding the capacitor; or

The grounding device comprises an inductor; the frequency band control unit comprises a multi-control switch and a frequency band limiting device connected with the ground; the multi-control switch is used for communicating the inductor with the frequency band limiting device or grounding the inductor.

7. The antenna device according to claim 5, wherein the grounding means comprises at least two capacitors; the frequency band control unit comprises at least one frequency band limiting device, one end of the frequency band limiting device is grounded, and the other end of the frequency band limiting device is connected with the capacitor; different capacitors are connected with different frequency band limiting devices, and the number of the frequency band limiting devices is not more than that of the capacitors; the capacitor not connected with the frequency band limiting device is grounded; or

The grounding device comprises at least two inductors; the frequency band control unit comprises at least one frequency band limiting device, one end of the frequency band limiting device is grounded, and the other end of the frequency band limiting device is connected with the inductor; different inductors are connected with different frequency band limiting devices, and the number of the frequency band limiting devices is not more than that of the inductors; the inductance not connected to the band limiting device is grounded.

8. The antenna device of claim 1, wherein the grounding means comprises a multi-switch and a band-defining device connected to at least one ground;

the multi-control switch is used for connecting the frequency band limiting device corresponding to the signal to be blocked with the antenna radiating body and disconnecting the rest frequency band limiting devices from the antenna radiating body.

9. An antenna arrangement according to any of claims 3, 4, 6, 7 and 8, characterized in that said band limiting means comprise at least one capacitor and/or at least one inductor.

10. A terminal, characterized in that it comprises at least one antenna device according to any of claims 1-9.