CN216015691U

CN216015691U - Antenna module and terminal

Info

Publication number: CN216015691U
Application number: CN202121851663.6U
Authority: CN
Inventors: 李彦涛
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-08-09
Filing date: 2021-08-09
Publication date: 2022-03-11
Anticipated expiration: 2031-08-09

Abstract

The utility model discloses an antenna module and a terminal, and belongs to the technical field of antennas. The antenna module comprises an antenna, a first resonant circuit, a second resonant circuit, a feed port and a grounding port; the first resonant circuit comprises a capacitor device, and the second resonant circuit comprises a grounding device; the first resonant circuit further comprises a first inductive device connected in series with the capacitive device, and/or the second resonant circuit further comprises a second inductive device connected in series with the ground device; the feed port is electrically connected with the input end of the first resonant circuit, and the output end of the first resonant circuit is electrically connected with a first feed point on the antenna; the second feed point on the antenna is electrically connected with the input end of the second resonant circuit, and the output end of the second resonant circuit is electrically connected with the grounding port. According to the utility model, the return loss between the feed port and the antenna can be reduced through the first inductance device or the second inductance device, and the performance of the antenna is improved.

Description

Antenna module and terminal

Technical Field

The present invention relates to the field of antenna technologies, and in particular, to an antenna module and a terminal.

Background

With the rapid development of scientific technology, various antennas are arranged in the terminal for communication. For example, the terminal may be a mobile phone, and different types of antennas may be configured by a metal frame of the mobile phone.

At present, as more and more functions can be implemented in a terminal, the terminal needs to use different communication frequency bands for communication, for example, in an antenna having a function of detecting an electromagnetic Absorption Rate (SAR), when a metal bezel is used as a radiator of the antenna, the metal bezel needs to be electrically connected to a ground plane through a decoupling unit, and one side of a feed port of the antenna is also electrically connected to the radiator of the antenna through the decoupling unit.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an antenna module and a terminal, which can reduce return loss between a feed port and an antenna and improve the performance of the antenna.

In one aspect, an embodiment of the present invention provides an antenna module, which includes an antenna, a first resonant circuit, a second resonant circuit, a feed port, and a ground port;

the first resonant circuit comprises a capacitor device, and the second resonant circuit comprises a grounding device;

the first resonant circuit further comprises a first inductive device in series with the capacitive device, and/or the second resonant circuit further comprises a second inductive device in series with the ground device;

the feed port is electrically connected with the input end of the first resonant circuit, and the output end of the first resonant circuit is electrically connected with a first feed point on the antenna;

and a second feeding point on the antenna is electrically connected with the input end of the second resonant circuit, and the output end of the second resonant circuit is electrically connected with the grounding port.

Optionally, the number of the first inductance devices is at least 2, and the first inductance devices are connected in parallel;

the antenna module further comprises a first control unit, and the first control unit is connected with components in the first resonant circuit in series;

the first control unit is configured to receive a first control signal, where the first control signal is used to turn on any one or more of the first inductance devices.

Optionally, the first control unit includes at least one output terminal, the number of the at least one output terminal is greater than or equal to the number of the first inductance devices, the input terminal of the first control unit is electrically connected to the capacitance device, and each of the first inductance devices is electrically connected to one output terminal of the first control unit; or,

the first control unit comprises at least one input end, the number of the at least one input end is larger than or equal to that of the first inductance devices, each first inductance device is electrically connected with one input end of the first control unit, and the output end of the first control unit is electrically connected with the feed port.

Optionally, the number of the capacitor devices is at least 2, and the capacitor devices are connected in parallel;

the first control unit comprises at least one input end and at least one output end, the number of the at least one input end is greater than or equal to that of the capacitance devices, and the number of the at least one output end is greater than or equal to that of the first inductance devices;

each capacitor device is electrically connected with one input end of the first control unit, and each first inductor device is electrically connected with one output end of the first control unit.

Optionally, the number of the second inductance devices is at least 2, and the second inductance devices are connected in parallel;

the antenna module further comprises a second control unit, and the second control unit is connected with components in the second resonant circuit in series;

the second control unit is configured to receive a second control signal, where the second control signal is used to turn on any one or more of the second inductance devices.

Optionally, the second control unit includes at least one output terminal, the number of the at least one output terminal is greater than or equal to the number of the second inductive devices, the input terminal of the second control unit is electrically connected to the ground device, and each of the second inductive devices is electrically connected to one output terminal of the first control unit; or,

the second control unit comprises at least one input end, the number of the at least one input end is larger than or equal to that of the second inductive devices, each second inductive device is electrically connected with one input end of the second control unit, and the output end of the second control unit is electrically connected with the grounding port.

Optionally, the number of the grounding devices is at least 2, and the grounding devices are connected in parallel;

the second control unit comprises at least one input end and at least one output end, the number of the at least one input end is greater than or equal to that of the grounding devices, and the number of the at least one output end is greater than or equal to that of the second inductance devices;

each grounding device is electrically connected with one input end of the second control unit, and each second inductance device is electrically connected with one output end of the second control unit.

Optionally, the grounding device is any one or more of a resistive element, a capacitive element and an inductive element.

Optionally, the antenna includes a metal frame in the terminal;

the antenna is used for measuring the electromagnetic wave absorption ratio SAR.

In another aspect, an embodiment of the present invention provides a terminal, where the terminal includes at least one antenna module according to the above aspect.

The technical scheme provided by the embodiment of the utility model at least comprises the following beneficial effects:

in the embodiment of the utility model, the antenna module comprises an antenna, a first resonant circuit, a second resonant circuit, a feed port and a ground port; the first resonant circuit comprises a capacitor device, and the second resonant circuit comprises a grounding device; the first resonant circuit further comprises a first inductive device connected in series with the capacitive device, and/or the second resonant circuit further comprises a second inductive device connected in series with the ground device; the feed port is electrically connected with the input end of the first resonant circuit, and the output end of the first resonant circuit is electrically connected with a first feed point on the antenna; the second feed point on the antenna is electrically connected with the input end of the second resonant circuit, and the output end of the second resonant circuit is electrically connected with the grounding port. In the utility model, after the feed port of the antenna module outputs signals to the antenna, the first inductance device in the first resonance circuit and/or the second inductance device in the second resonance circuit resonate with the capacitance device in the first resonance circuit, thereby reducing the return loss between the feed port and the antenna and improving the performance of the antenna.

Drawings

Fig. 1 is a schematic structural diagram of an antenna module according to an exemplary embodiment of the present invention;

fig. 2 is a schematic diagram of a first resonant circuit according to an exemplary embodiment of the present invention;

FIG. 3 is a schematic diagram of a second resonant circuit according to an exemplary embodiment of the present invention;

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

fig. 5 is a schematic diagram of another first resonant circuit according to an exemplary embodiment of the present invention;

fig. 6 is a schematic diagram of another first resonant circuit according to an exemplary embodiment of the present invention;

FIG. 7 is a comparison graph of return loss testing provided by an embodiment of the present invention;

fig. 8 is a schematic structural diagram of an antenna module according to an exemplary embodiment of the present invention;

fig. 9 is a schematic structural diagram of an antenna module according to an exemplary embodiment of the present invention;

fig. 10 is a schematic structural diagram of a terminal according to an exemplary embodiment of the present invention.

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 invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the utility model, as detailed in the appended claims.

Reference herein to "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which 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.

It should be noted that the terms "first", "second", "third" and "fourth" etc. in the description and claims of the present invention are used for distinguishing different objects, and are not used for describing a specific order. The terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The scheme provided by the utility model can be used in a use scene of communication through the antenna module when the terminal used by people in daily life comprises the antenna module consisting of the metal frame, and for convenience of understanding, some terms and application architectures related to the embodiment of the utility model are simply introduced below.

Various terminals can be regarded as a transceiver of a radio set, which is designed and manufactured to not exceed the upper limit value of the radiation energy of electromagnetic waves. Wherein, the upper limit value can be set by developers according to actual application measurement.

SAR (Specific Absorption Rate, electromagnetic wave energy Absorption ratio) is the electromagnetic radiation energy absorbed by human tissue in unit mass and unit time, in watts/kg. SAR values are adopted as standards for measuring the radiation of mobile phones in the United states and Europe, the adoption of SAR values is also recommended by international organizations such as the International Union of telecommunication, the International organization of health and the like, and the adoption of SAR values is also required by the electromagnetic radiation protection standard which is formulated in China.

MIMO (Multiple-Input Multiple-Output) 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.

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.

Terminals have been correspondingly provided with different antenna systems in order to implement various functions. For example, a Wi-Fi (Wireless Fidelity )2.4GHz +5GHz antenna, a GPS (Global Positioning System) antenna, a detection antenna for detecting SAR, and the like. The terminal may also be provided with MIMO antennas with which to transmit data. Various antennas can generate radiation in the working process, and the electromagnetic wave radiation of each antenna is detected through the detection antenna for detecting the SAR, so that the antenna of the terminal is prevented from not meeting the electromagnetic radiation protection standard.

Alternatively, the terminal may be a terminal on which an antenna designed with detection for detecting SAR is mounted. 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.

In the related art, the requirement of the terminal for the arranged SAR antenna is more and more strict, and the SAR antenna arranged by the metal frame requires that the metal frame body must be connected with the ground plate through a decoupling unit, wherein the decoupling unit usually takes the form of a capacitor. When the feed port of the SAR antenna transmits an electric signal to the radiator of the SAR antenna, due to the influence of the decoupling unit, the circuit where the SAR sensor is located requires that the capacitance of the decoupling unit cannot be too strong, otherwise, the detection accuracy of the SAR sensor is influenced. However, if the capacitance of the decoupling unit is too small for the radiator of the antenna, the ground return effect of the antenna signal is also reduced. Therefore, the capacitance of the decoupling unit is required to meet the detection precision of the SAR sensor, and the ground return effect of the antenna signal is also required to be ensured, so that a larger return loss exists between the feed port of the SAR antenna and the radiator of the SAR antenna, and the performance of the SAR antenna is reduced.

In order to reduce return loss between a feed port and an antenna and improve the performance of the antenna, the utility model provides a solution which can neutralize the capacitance of the antenna for detecting the SAR in a loop, and adopts a resonant circuit to replace a decoupling unit, so that the return loss between the feed port and the antenna is reduced and the performance of the antenna is improved.

Fig. 1 is a schematic structural diagram of an antenna module according to an exemplary embodiment of the utility model. The antenna module 100 can be applied to a terminal.

The antenna module 100 includes an antenna 101, a first resonant circuit 102, a second resonant circuit 103, a feeding port 104 and a ground port 105.

The first resonant circuit 102 contains a capacitor device and the second resonant circuit 103 contains a ground device; the first resonance circuit 102 further comprises a first inductive device in series with the capacitive device and/or the second resonance circuit 103 further comprises a second inductive device in series with the ground device.

For example, please refer to fig. 2, which shows a schematic structural diagram of a first resonant circuit according to an exemplary embodiment of the present invention. As shown in fig. 2, the first resonant circuit 200 includes a capacitor device 201 and a first inductor device 202, and the capacitor device 201 and the first inductor device 202 are connected in series with each other in the manner shown in fig. 2. Referring to fig. 3, a schematic diagram of a second resonant circuit according to an exemplary embodiment of the utility model is shown. As shown in fig. 3, the second resonant circuit 300 comprises a ground device 301 and a second inductive device 302, the ground device 301 and the second inductive device 302 being connected in series with each other in the manner shown in fig. 3.

The first resonant circuit 102 further includes a first inductive device connected in series with the capacitive device, and/or the second resonant circuit 103 further includes a second inductive device connected in series with the ground device; that is, in the antenna module 100 shown in fig. 1, when the first resonant circuit 102 includes the first inductance device, the first inductance device in the first resonant circuit 102 is connected in series with the capacitance device, and in this case, the second resonant circuit 102 may include the second inductance device or may not include the second inductance device. Correspondingly, when the second resonant circuit 103 includes the second inductance device, the second inductance device in the second resonant circuit 103 is connected in series with the ground device, and in this case, the first resonant circuit 102 may include the first inductance device or may not include the first inductance device. Correspondingly, the first resonant circuit 102 includes a first inductive device, the second resonant circuit 103 also includes a second inductive device, the first inductive device of the first resonant circuit 102 is connected in series with the capacitive device, and the second inductive device of the second resonant circuit 103 is connected in series with the ground device.

As shown in fig. 1, the feeding port 104 is electrically connected to an input terminal of the first resonant circuit 102, and an output terminal of the first resonant circuit 102 is electrically connected to a first feeding point 106 on the antenna; a second feeding point 107 of the antenna is electrically connected to an input of the second resonant circuit 103, and an output of the second resonant circuit 103 is electrically connected to the ground port 105. The first feeding point 106 and the second feeding point 107 may be any feeding point on the antenna.

When a signal is transmitted from the feed port 104, the signal passes through the first resonant circuit to the antenna, and the antenna returns to ground through the second resonant circuit. When the first resonant circuit 102 includes the first inductance device and the second resonant circuit 103 does not include the second inductance device, the first inductance device may resonate a capacitance equivalent to the ground device and a capacitance equivalent to the ground device, so as to reduce an influence of the capacitance equivalent to the ground device and the capacitance equivalent to the ground device on the antenna. Alternatively, when the first resonant circuit 102 does not include the first inductance device and the second resonant circuit 103 includes the second inductance device, the second inductance device may resonate a capacitance equivalent to the ground device and a capacitance equivalent to the ground device, so as to reduce an influence of the capacitance equivalent to the ground device and the capacitance equivalent to the ground device on the antenna. Alternatively, when the first resonant circuit 102 includes the first inductance device and the second resonant circuit 103 also includes the second inductance device, the first inductance device and the second inductance device can simultaneously resonate the equivalent capacitance of the ground device and the equivalent capacitance of the ground device, so as to reduce the influence of the equivalent capacitance of the ground device and the equivalent capacitance of the ground device on the antenna.

In summary, in the embodiment of the present invention, the antenna module includes an antenna, a first resonant circuit, a second resonant circuit, a feeding port and a grounding port; the first resonant circuit comprises a capacitor device, and the second resonant circuit comprises a grounding device; the first resonant circuit further comprises a first inductive device connected in series with the capacitive device, and/or the second resonant circuit further comprises a second inductive device connected in series with the ground device; the feed port is electrically connected with the input end of the first resonant circuit, and the output end of the first resonant circuit is electrically connected with a first feed point on the antenna; the second feed point on the antenna is electrically connected with the input end of the second resonant circuit, and the output end of the second resonant circuit is electrically connected with the grounding port. In the utility model, after the feed port of the antenna module outputs signals to the antenna, the first inductance device in the first resonance circuit and/or the second inductance device in the second resonance circuit resonate with the capacitance device in the first resonance circuit, thereby reducing the return loss between the feed port and the antenna and improving the performance of the antenna.

In a possible implementation manner, when the first resonant circuit includes the first inductance device, the number of the first inductance device may be multiple, that is, at least 2, and the first inductance devices are connected in parallel, in the antenna module, the return loss may be correspondingly reduced by controlling different first inductance devices to access the antenna module, and the performance of the antenna may be improved by correspondingly reducing the return loss corresponding to different antenna signals.

Fig. 4 is a schematic structural diagram of an antenna module according to an exemplary embodiment of the utility model. The antenna module 400 can be applied to a terminal.

The antenna module 400 includes an antenna 401, a first resonant circuit 402, a second resonant circuit 403, a feeding port 404 and a ground port 405. Optionally, the antenna 401 may be an antenna formed by a metal frame in a terminal; the antenna 401 is used for measuring an electromagnetic wave absorption ratio SAR, and the working frequency band of the antenna is 0.7GHz to 1 GHz.

The first resonant circuit 402 contains capacitive devices and the second resonant circuit 403 contains ground devices; the first resonant circuit 402 further comprises a first inductive device in series with the capacitive device and/or the second resonant circuit 403 further comprises a second inductive device in series with the ground device.

In one possible implementation, the first resonant circuit 402 further includes a first inductive device connected in series with the capacitive device, but the second resonant circuit 403 does not include a second inductive device. The number of the first inductance devices is at least 2, the first inductance devices are connected in parallel, and the inductance values of the first inductance devices are different; the antenna module 400 further includes a first control unit 406, wherein the first control unit 406 is connected in series with the components in the first resonant circuit 402; the first control unit 406 is configured to receive a first control signal, where the first control signal is used to turn on any one or more of the first inductance devices.

For example, in fig. 4, it is exemplified that the first resonant circuit 402 includes a first inductance device, but the second resonant circuit 403 does not include a second inductance device, the first resonant circuit 402 includes four first inductance devices 402a, the four first inductance devices 402a are connected in parallel with each other and connected in series with a capacitance device 402b, and the antenna control unit 406 is also connected in series with the components in the first resonant circuit 402.

In a possible implementation manner, the first control unit 406 includes at least one output terminal, the number of the at least one output terminal is greater than or equal to the number of the first inductive devices, the input terminal of the first control unit is electrically connected to the capacitor device, and each first inductive device is electrically connected to one output terminal of the first control unit. As shown in fig. 4, the first control unit 406 is connected in series between the capacitor device 402b and the first inductor device 402a, the first resonant circuit 402 includes four first inductor devices 402a, the first control unit 406 includes four

output terminals

406a, 406b, 406c, and 406d, each output terminal is electrically connected to a corresponding one of the first inductor devices, and the first control unit 406 can turn on any one or more of the first inductor devices by receiving the first control signal. For example, the first control unit 406 may switch among different first inductance devices through a single-pole multi-throw switch, or may switch different first inductance devices in parallel through a multi-pole multi-throw switch.

For example, the first inductive device currently turned on by the first control unit 406 is the first inductive device connected to the output terminal 406a, the first control signal is required to turn on the first inductive device connected to the output terminal 406b in each first inductive device, and after receiving the first control signal, the first control unit 406 may switch the first inductive device connected to the output terminal 406a and turned on in the first resonant circuit 402 to the first inductive device connected to the output terminal 406b by using the single-pole multi-throw switch to switch from the output terminal 406a to the output terminal 406 b.

In a possible implementation manner, the first control unit 406 includes at least one input terminal, the number of the at least one input terminal is greater than or equal to the number of the first inductive devices, each of the first inductive devices is electrically connected to one input terminal of the first control unit, and the output terminal of the first control unit is electrically connected to the feeding port.

Referring to fig. 5, a schematic diagram of another first resonant circuit according to an exemplary embodiment of the present invention is shown, and as shown in fig. 5, a first resonant circuit 500 includes a capacitor device 501, first inductive devices 502, and a first control unit 503. In fig. 5, which is also an example of four first inductance devices, the first control unit 503 further includes four

input terminals

503a, 503b, 503c, and 503d, where each input terminal corresponds to one first inductance device and is electrically connected to the first inductance device, and the first control unit 503 may turn on any one or more of the first inductance devices by receiving a first control signal. For example, the first control unit 503 may realize switching among different first inductance devices through a single-pole multi-throw switch, or may realize the effect of switching different first inductance devices in parallel through a multi-pole multi-throw switch.

For example, the first inductive device currently turned on by the first control unit 503 is the first inductive device connected to the input terminal 503a, the first control signal is required to turn on the first inductive device connected to the input terminal 503b in each first inductive device, and after receiving the first control signal, the first control unit 503 may switch the first inductive device connected to the input terminal 503a and turned on by the first resonant circuit 502 to the first inductive device connected to the input terminal 503b through the single-pole multi-throw switch.

In one possible implementation manner, the number of the capacitive devices in the first resonant circuit is at least 2, and the capacitive devices are connected in parallel with each other, wherein the capacitance values of the capacitive devices are different; the first control unit comprises at least one input end and at least one output end, the number of the at least one input end is larger than or equal to that of the capacitor devices, and the number of the at least one output end is larger than or equal to that of the first inductor devices; each capacitor device is electrically connected with one input end of the first control unit, and each first inductor device is electrically connected with one output end of the first control unit.

Referring to fig. 6, which shows a schematic structural diagram of another first resonant circuit according to an exemplary embodiment of the present invention, as shown in fig. 6, the first resonant circuit 600 includes capacitor devices 601, first inductor devices 602, and a first control unit 603. In fig. 6, the capacitor device is also four, for example, four first inductor devices, the first control unit 603 further includes four

input terminals

603a, 603b, 603c, and 603d, respectively, the first control unit 603 further includes four

output terminals

603e, 603f, 603g, and 603h, respectively, each input terminal is electrically connected to one capacitor device, each output terminal is electrically connected to one first inductor device, and the first control unit 603 can turn on any one or more of the capacitor devices and turn on any one or more of the first inductor devices by receiving a first control signal. For example, the first control unit 603 switches between different capacitor devices and different first inductor devices through a multi-pole multi-throw switch, so as to achieve the effect of connecting different capacitor devices in parallel and/or connecting different first inductor devices in parallel and switching.

For example, the currently-turned-on capacitor device of the first control unit 603 is a capacitor device connected to the input terminal 603a, the currently-turned-on first inductor device of the first control unit 603 is a first inductor device connected to the output terminal 603f, the first control signal is a signal required to turn on a capacitor device connected to the input terminal 603b among the capacitor devices and a first inductor device connected to the output terminal 603h among the first inductor devices, and after receiving the first control signal, the first control unit 603 may switch from the input terminal 603a to the input terminal 603b and from the output terminal 603f to the output terminal 603h through the multi-pole multi-throw switch, switch the originally-turned-on capacitor device connected to the input terminal 603a in the first resonant circuit 602 to a capacitor device connected to the input terminal 603b, and switch the originally-turned-on first inductor device connected to the output terminal 603f in the first resonant circuit 602 to a first inductor device connected to the output terminal 603 h.

In fig. 4, the feeding port 404 is further electrically connected to an input terminal of the first resonant circuit 402, and an output terminal of the first resonant circuit 402 is further electrically connected to a first feeding point 407 on the antenna; a second feeding point 408 on the antenna is electrically connected to an input of the second resonant circuit 403, and an output of the second resonant circuit 403 is electrically connected to the ground port 405. The first feeding point 407 and the second feeding point 408 may be any feeding point on the antenna.

When a signal is transmitted from the feed port 404, the signal passes through the first resonant circuit to the antenna, and the antenna returns to ground through the second resonant circuit. The first resonant circuit 402 includes the first inductance device shown in fig. 4 to 6, and the first inductance device turned on in the first resonant circuit 402 can resonate the capacitance device in the first resonant circuit and the capacitance equivalent to the ground device in the second resonant circuit, so as to reduce the capacitance equivalent to the ground device and the influence of the capacitance device on the antenna.

Referring to fig. 7, a comparison chart of return loss tests according to an embodiment of the utility model is shown. As shown in fig. 7, a first return loss curve 701 and a second return loss curve 702 are included. Taking the above-mentioned equivalent capacitance of the capacitance device in the first resonant circuit and the grounding device in the second resonant circuit in fig. 4 as 22P as an example, the first inductance device is not added to the first resonant circuit, the second inductance device is not added to the second resonant circuit, the return loss variation curve from the feeding port of the antenna to the antenna in the antenna module is shown as the first return loss curve 701 in fig. 7, the first inductance device is added to the first resonant circuit, and/or the second inductance device is added to the second resonant circuit, and the return loss variation curve from the feeding port of the antenna to the antenna in the antenna module is shown as the second return loss curve 702 in fig. 7. Through comparison, the return loss between the feed port and the antenna is improved by at least 10dB in the working frequency range of the antenna.

In a possible implementation manner, when the second resonant circuit includes the second inductance device, the number of the second inductance device may be multiple, that is, at least 2, and the second inductance devices are connected in parallel, in the antenna module, the return loss may be correspondingly reduced by controlling different first inductance devices to access the antenna module, and the performance of the antenna may be improved by correspondingly reducing the return loss corresponding to different antenna signals.

Fig. 8 is a schematic structural diagram of an antenna module according to an exemplary embodiment of the utility model. The antenna module 800 can be applied to a terminal.

The antenna module 800 includes an antenna 801, a first resonant circuit 802, a second resonant circuit 803, a feeding port 804 and a ground port 805. Optionally, the antenna 801 may be an antenna formed by a metal frame in a terminal; the antenna 801 is used for measuring an electromagnetic wave absorption ratio SAR, and the working frequency band of the antenna is 0.8GHz to 1 GHz.

The antenna module 800 includes an antenna 801, a first resonant circuit 802, a second resonant circuit 803, a feeding port 807, and a ground port 805.

The first resonant circuit 802 contains a capacitor device and the second resonant circuit 803 contains a ground device; the first resonance circuit 802 further comprises a first inductive device in series with the capacitive device and/or the second resonance circuit 803 further comprises a second inductive device in series with the ground device.

In one possible implementation, the second resonant circuit 803 further includes a second inductive device, which is connected in series with the ground device, but the first resonant circuit 802 does not include the first inductive device. The number of the second inductance devices is at least 2, the second inductance devices are connected in parallel, and the inductance values of the second inductance devices are different; the antenna module 800 further includes a second control unit 806, where the second control unit 806 is connected in series with the components in the second resonant circuit 803; the second control unit 806 is configured to receive a second control signal, where the second control signal is configured to turn on any one or more of the second inductance devices.

For example, in fig. 8, it is exemplified that the second resonant circuit 803 includes the second inductance device, but the second resonant circuit 803 does not include the second inductance device, and the second resonant circuit 803 includes four second inductance devices 803a, the four second inductance devices 803a are connected in parallel with each other and connected in series with the ground device 803b, and the antenna control unit 806 is also connected in series with the components in the second resonant circuit 803.

In a possible implementation manner, the second control unit 806 includes at least one output terminal, the number of the at least one output terminal is greater than or equal to the number of the second inductive devices, the input terminal of the second control unit is electrically connected to the capacitive device, and each of the second inductive devices is electrically connected to one output terminal of the second control unit. The connection manner between the second control unit and each second inductance device in the second resonant circuit may refer to the connection manner between the first control unit and each first inductance device in fig. 4, and is not described herein again.

In a possible implementation manner, the second control unit 806 includes at least one input terminal, the number of the at least one input terminal is greater than or equal to the number of the second inductive devices, each of the second inductive devices is electrically connected to one input terminal of the second control unit, and the output terminal of the second control unit is electrically connected to the feeding port. The connection manner between the second control unit and each second inductance device in the second resonant circuit may refer to the connection manner between the first control unit and each first inductance device in fig. 5, and is not described herein again.

In one possible implementation, the number of the grounding devices in the second resonant circuit is at least 2, and the grounding devices are connected in parallel with each other; the second control unit comprises at least one input end and at least one output end, the number of the at least one input end is larger than or equal to that of the grounding devices, and the number of the at least one output end is larger than or equal to that of the second inductance devices; each grounding device is electrically connected with one input end of the second control unit, and each second inductance device is electrically connected with one output end of the second control unit. The connection manner between the second control unit and each grounding device in the second resonant circuit and each second inductance device may refer to the connection manner between the first control unit and each grounding device in fig. 6 and each first inductance device, which is not described herein again.

Alternatively, the grounding device may be any one or more of a resistive element, a capacitive element, and an inductive element. For example, the grounding device may be a single resistive element, or a capacitive element, or an inductive element, or the grounding device may be a circuit formed by combining any two of the resistive element, the capacitive element, and the inductive element.

In fig. 8, the feeding port 804 is further electrically connected to the input terminal of the first resonant circuit 402, and the output terminal of the first resonant circuit 802 is further electrically connected to the first feeding point 807 on the antenna; the second feeding point 807 of the antenna is electrically connected to the input terminal of the second resonant circuit 803, and the output terminal of the second resonant circuit 803 is electrically connected to the ground port 805. The first feeding point 806 and the second feeding point 807 may be any feeding point on the antenna.

When a signal is transmitted from the feed port 804, the signal passes through the first resonant circuit to the antenna, and the antenna returns to ground through the second resonant circuit. Wherein the second resonant circuit 803 includes the second inductance device shown in fig. 8, and the second inductance device turned on in the second resonant circuit 803 can resonate the capacitance device in the first resonant circuit and the equivalent capacitance of the grounding device in the second resonant circuit, so as to reduce the equivalent capacitance of the grounding device and the influence of the capacitance device on the antenna.

In a possible implementation manner, the solutions shown in fig. 4 and fig. 8 may also be combined with each other, please refer to fig. 9, which shows a schematic structural diagram of an antenna module according to an exemplary embodiment of the present invention. The antenna module 900 can be applied to a terminal. As shown in fig. 9, the antenna module 900 includes an antenna 901, a first resonant circuit 902, a second resonant circuit 903, a feed port 904, and a ground port 905.

Wherein the first resonant circuit 902 comprises a capacitor element 902a, and the second resonant circuit 903 comprises a ground element 903 a; first resonant circuit 902 further comprises a first inductive device 902b, first inductive device 902b being in series with capacitive device 902a, and second resonant circuit 903 further comprises a second inductive device 903b, second inductive device 903b being in series with ground device 903 a. The number of the first inductance device and the second inductance device may also be multiple, and the connection is performed according to the manner shown by the first control unit and the second control unit, which is not described herein again.

The feeding port 904 is further electrically connected to an input terminal of the first resonant circuit 902, and an output terminal of the first resonant circuit 902 is further electrically connected to a first feeding point 907 on the antenna; a second feeding point 904 on the antenna is electrically connected to an input of the second resonant circuit 903, and an output of the second resonant circuit 903 is electrically connected to a ground port 905. The first feed point 906 and the second feed point 907 may be any one of feed points on the antenna. When a signal is transmitted from the feed port 904, the signal passes through the first resonant circuit to the antenna, and the antenna returns to ground through the second resonant circuit. The first inductance device and the second inductance device included in the first resonant circuit 902 and the second resonant circuit 903 are turned on, and the capacitance equivalent to the ground device in the first resonant circuit and the capacitance equivalent to the ground device in the second resonant circuit can be resonated, so that the influence of the capacitance equivalent to the ground device and the capacitance equivalent to the ground device on the antenna is reduced.

In a possible implementation manner, the antenna module may be applied in a terminal, and the terminal device may include at least one antenna module as described in any one of fig. 1 to 9.

Referring to fig. 10, a schematic structural diagram of a terminal according to an exemplary embodiment of the present invention is shown. As shown in fig. 10, the terminal 1000 includes a first antenna module 1001, a second antenna module 1002, a third antenna module 1003, and a fourth antenna module 1004. Each antenna module may be similar to the structure of any one of the antenna modules shown in fig. 1 to 8.

Optionally, the antenna in the antenna module is used for measuring an electromagnetic wave absorption ratio SAR, the antenna is composed of a metal frame in the terminal, when the first antenna module 1001 works, the SAR of another antenna in the terminal is detected, when the first antenna module 1001 sends a signal through a feed port of the first antenna module, the signal reaches the antenna through the first resonant circuit, and the antenna returns to the ground through the second resonant circuit. When the first resonant circuit comprises the first inductance device and the second resonant circuit does not comprise the second inductance device, the first inductance device can resonate the equivalent capacitance of the grounding device and the equivalent capacitance of the grounding device, so that the influence of the equivalent capacitance of the grounding device and the equivalent capacitance of the grounding device on the antenna is reduced. Or, when the first resonant circuit does not include the first inductance device and the second resonant circuit includes the second inductance device, the second inductance device may resonate the equivalent capacitance of the ground device and the equivalent capacitance of the capacitance device, so as to reduce the influence of the equivalent capacitance of the ground device and the equivalent capacitance of the capacitance device on the antenna. Or, when the first resonant circuit includes the first inductance device and the second resonant circuit also includes the second inductance device, the first inductance device and the second inductance device can simultaneously resonate the equivalent capacitance of the grounding device and the equivalent capacitance of the grounding device, so as to reduce the influence of the equivalent capacitance of the grounding device and the equivalent capacitance of the grounding device on the antenna.

In summary, in the embodiment of the present invention, the antenna module in the terminal includes an antenna, a first resonant circuit, a second resonant circuit, a feeding port, and a grounding port; the first resonant circuit comprises a capacitor device, and the second resonant circuit comprises a grounding device; the first resonant circuit further comprises a first inductive device connected in series with the capacitive device, and/or the second resonant circuit further comprises a second inductive device connected in series with the ground device; the feed port is electrically connected with the input end of the first resonant circuit, and the output end of the first resonant circuit is electrically connected with a first feed point on the antenna; the second feed point on the antenna is electrically connected with the input end of the second resonant circuit, and the output end of the second resonant circuit is electrically connected with the grounding port. In the utility model, after the feed port of the antenna module outputs signals to the antenna, the first inductance device in the first resonance circuit and/or the second inductance device in the second resonance circuit resonate with the capacitance device in the first resonance circuit, thereby reducing the return loss between the feed port and the antenna and improving the performance of the antenna.

The antenna module and the terminal disclosed in the embodiments of the present invention are described above by way of example, and the principles and embodiments of the present invention are explained herein by applying an example, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. An antenna module is characterized by comprising an antenna, a first resonant circuit, a second resonant circuit, a feed port and a ground port;

2. The antenna module of claim 1, wherein the number of first inductive devices is at least 2, each of the first inductive devices being connected in parallel with each other;

3. The antenna module of claim 2, wherein the first control unit comprises at least one output terminal, the number of the at least one output terminal is greater than or equal to the number of the first inductive devices, the input terminal of the first control unit is electrically connected to the capacitive device, and each of the first inductive devices is electrically connected to one output terminal of the first control unit; or,

4. The antenna module of claim 2, wherein the number of capacitive devices is at least 2, each capacitive device being connected in parallel with each other;

5. The antenna module of claim 1, wherein the number of said second inductive devices is at least 2, each of said second inductive devices being connected in parallel with each other;

6. The antenna module of claim 5, wherein the second control unit comprises at least one output terminal, the number of the at least one output terminal is greater than or equal to the number of the second inductive devices, the input terminal of the second control unit is electrically connected to the ground device, and each of the second inductive devices is electrically connected to one output terminal of the second control unit; or,

7. The antenna module of claim 5, wherein the number of ground devices is at least 2, each of the ground devices being connected in parallel with each other;

8. The antenna module of any one of claims 1 to 7, wherein the grounding device is any one or more of a resistive element, a capacitive element, and an inductive element.

9. The antenna module of any one of claims 1 to 7, wherein the antenna comprises a metal bezel in the terminal;

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