CN110600866A - Antenna unit and terminal equipment - Google Patents

Abstract

The embodiment of the invention provides an antenna unit and terminal equipment, relates to the technical field of communication, and aims to solve the problem that the antenna performance of the terminal equipment is poor due to the fact that the frequency range covered by a millimeter wave antenna of the conventional terminal equipment is small. The antenna unit includes: the metal groove, the M feeding parts arranged at the bottom of the metal groove and the M feeding arms arranged in the metal groove; each of the M feeding portions is electrically connected with one feeding arm and insulated from the metal groove, the distance between each of the M feeding arms and the inner surface of the bottom of the metal groove is greater than one half of a first distance and is coupled with the metal groove, the first distance is the distance between the surface where an opening of the metal groove is located and the inner surface of the bottom of the metal groove, and M is a positive integer. The antenna unit is applied to terminal equipment.

Description

Antenna unit and terminal equipment

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to an antenna unit and terminal equipment.

Background

With the development of the fifth Generation mobile communication (5th-Generation, 5G) system and the wide application of terminal devices, the millimeter wave antenna is gradually applied to various terminal devices to meet the increasing use requirements of users.

At present, a millimeter wave antenna in a terminal device is mainly implemented by an Antenna In Package (AiP) technology. For example, as shown in fig. 1, an array antenna 11 with an operating wavelength of millimeter waves, a Radio Frequency Integrated Circuit (RFIC) 12, a Power Management Integrated Circuit (PMIC) 13 and a connector 14 may be packaged into a module 10 by AiP technology, where the module 10 may be referred to as a millimeter wave antenna module. The antenna in the array antenna may be a patch antenna, a yagi-uda antenna, or a dipole antenna.

However, since the antennas in the array antenna are usually narrow-band antennas (such as the patch antennas listed above), the coverage frequency band of each antenna is limited, but the millimeter wave frequency band planned in the 5G system is usually many, for example, n257(26.5-29.5GHz) frequency band mainly including 28GHz and n260(37.0-40.0GHz) frequency band mainly including 39GHz, and the like, so that the conventional millimeter wave antenna module may not cover the mainstream millimeter wave frequency band planned in the 5G system, thereby resulting in poor antenna performance of the terminal device.

Disclosure of Invention

The embodiment of the invention provides an antenna unit and terminal equipment, and aims to solve the problem that the antenna performance of the terminal equipment is poor due to the fact that the frequency range covered by a millimeter wave antenna of the conventional terminal equipment is small.

In order to solve the technical problem, the present application is implemented as follows:

in a first aspect, an embodiment of the present invention provides an antenna unit, where the antenna unit includes: the metal groove, the M feeding parts arranged at the bottom of the metal groove and the M feeding arms arranged in the metal groove; each of the M feeding portions is electrically connected with one feeding arm and insulated from the metal groove, the distance between each of the M feeding arms and the inner surface of the bottom of the metal groove is greater than one half of a first distance, the first distance is coupled with the metal groove, the first distance is the distance between the surface where the opening of the metal groove is located and the inner surface of the bottom of the metal groove, and M is a positive integer.

In a second aspect, an embodiment of the present invention provides a terminal device, where the terminal device includes the antenna unit in the first aspect.

In the embodiment of the present invention, the antenna unit may include a metal groove, M feeding portions disposed at the bottom of the metal groove, and M feeding arms disposed in the metal groove; each of the M feeding portions is electrically connected with one feeding arm and insulated from the metal groove, the distance between each of the M feeding arms and the inner surface of the bottom of the metal groove is greater than one half of a first distance, the first distance is coupled with the metal groove, the first distance is the distance between the surface where the opening of the metal groove is located and the inner surface of the bottom of the metal groove, and M is a positive integer. According to the scheme, the feed arm can be coupled with the metal groove, so that the feed arm can be coupled with the metal groove under the condition that the feed arm receives an alternating current signal, the metal groove can generate an induced alternating current signal, and the feed arm and the metal groove can radiate electromagnetic waves with certain frequency; moreover, since there may be a plurality of current paths of the induced current generated by coupling the feeding arm and the metal groove (for example, there may be a plurality of current paths such as a current path from the feeding arm to the metal groove and then to the feeding arm, and a current path formed on the metal groove), the frequency of the electromagnetic wave generated by the current on the feeding arm via the metal groove may also be a plurality of frequencies, so that the antenna unit may cover a plurality of frequency bands, and the frequency band covered by the antenna unit may be increased.

Drawings

Fig. 1 is a schematic structural diagram of a conventional millimeter wave antenna according to an embodiment of the present invention;

fig. 2 is an exploded view of an antenna unit according to an embodiment of the present invention;

fig. 3 is a reflection coefficient diagram of an antenna unit according to an embodiment of the present invention;

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

fig. 5 is a second exploded view of an antenna unit according to an embodiment of the present invention;

fig. 6 is a top view of an antenna unit according to an embodiment of the present invention;

fig. 7 is a cross-sectional view of an antenna unit provided in an embodiment of the present invention;

fig. 8 is a third exploded view of an antenna unit according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a hardware structure of a terminal device according to an embodiment of the present invention;

fig. 10 is a second schematic diagram of a hardware structure of a terminal device according to the embodiment of the present invention;

fig. 11 is one of the radiation patterns of an antenna element provided by an embodiment of the present invention;

fig. 12 is a second radiation pattern of the antenna unit according to the second embodiment of the present invention;

fig. 13 is a bottom view of a terminal device according to an embodiment of the present invention.

Description of reference numerals: 10-millimeter wave antenna module; 11-array antenna with millimeter wave working wavelength; 12-RFIC; 13-PMIC; 14-a connector; 20-an antenna element; 201-metal recess; 202-a feeding part; 202 a-a first end of the feed; 203-feeding arm; 204 — a first insulator; 205 — a second insulator; 206-a through hole; 207 — a third insulator; s1 — first plane; l1 — first axis of symmetry; l2 — second axis of symmetry; l3 — first diagonal; l4 — second diagonal; b1 — first side of first insulator; a 1-distance 1; a 2-distance 2; 30-5G millimeter wave signals; 4-terminal equipment; 40, a shell; 41-a first metal frame; 42-a second metal frame; 43 — a third metal frame; 44-a fourth metal frame; 45, a floor; 46 — a first antenna; 47-first groove.

In the embodiment of the present invention, coordinate axes in the coordinate system shown in the drawings are orthogonal to each other.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. 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 application.

The term "and/or" herein is an association relationship describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. The symbol "/" herein denotes a relationship in which the associated object is or, for example, a/B denotes a or B.

The terms "first" and "second," and the like, in the description and in the claims of the present invention are used for distinguishing between different objects and not for describing a particular order of the objects. For example, the first insulator and the second insulator, etc. are for distinguishing different insulators, and are not used to describe a specific order of the insulators.

In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

In the description of the embodiments of the present invention, unless otherwise specified, "a plurality" means two or more, for example, a plurality of antenna elements means two or more antenna elements, and the like.

Some terms/nouns referred to in the embodiments of the present invention are explained below.

Coupling: it is meant that there is a close fit and interaction between the inputs and outputs of two or more circuit elements or electrical networks and that energy can be transferred from one side to the other by interaction.

"coupling" in embodiments of the present invention may be used to indicate that the components (e.g., M feed structures and metal grooves in embodiments) that are coupled may be coupled in the case of the antenna element being operated; these components are insulated from each other in the case of non-operation of the antenna element.

Alternating current signals: which is a signal that the direction of the current changes.

Multiple-input multiple-output (MIMO) technology: which refers to a technique for transmitting or receiving a signal using a plurality of antennas at a transmission end (i.e., a transmitting end and a receiving end) to improve communication quality. In this technique, a signal can be transmitted or received through a plurality of antennas at a transmission end.

Relative dielectric constant: a physical parameter for characterizing dielectric or polarization properties of the dielectric material.

Floor board: refers to a portion of the terminal device that can be a virtual ground. Such as a Printed Circuit Board (PCB) in the terminal device or a display screen of the terminal device.

A cellular antenna: refers to an antenna for communicating with terminal devices via an antenna beam having a width, an azimuth angle and a downtilt angle in a terrestrial-based cellular communication system.

The embodiment of the invention provides an antenna unit and terminal equipment, wherein the antenna unit can comprise a metal groove, M feeding parts arranged at the bottom of the metal groove and M feeding arms arranged in the metal groove; each of the M feeding portions is electrically connected with one feeding arm and insulated from the metal groove, the distance between each of the M feeding arms and the inner surface of the bottom of the metal groove is greater than one half of a first distance, the first distance is coupled with the metal groove, the first distance is the distance between the surface where the opening of the metal groove is located and the inner surface of the bottom of the metal groove, and M is a positive integer. According to the scheme, the feed arm can be coupled with the metal groove, so that the feed arm can be coupled with the metal groove under the condition that the feed arm receives an alternating current signal, the metal groove can generate an induced alternating current signal, and the feed arm and the metal groove can radiate electromagnetic waves with certain frequency; moreover, since there may be a plurality of current paths of the induced current generated by coupling the feeding arm and the metal groove (for example, there may be a plurality of current paths such as a current path from the feeding arm to the metal groove and then to the feeding arm, and a current path formed on the metal groove), the frequency of the electromagnetic wave generated by the current on the feeding arm via the metal groove may also be a plurality of frequencies, so that the antenna unit may cover a plurality of frequency bands, and the frequency band covered by the antenna unit may be increased.

The antenna unit provided by the embodiment of the present invention may be applied to a terminal device, and may also be applied to other electronic devices that need to use the antenna unit, and may be determined specifically according to actual use requirements, and the embodiment of the present invention is not limited. The following describes an exemplary antenna unit provided in an embodiment of the present invention, taking an application of the antenna unit to a terminal device as an example.

The following describes an antenna unit provided in an embodiment of the present invention by way of example with reference to the accompanying drawings.

As shown in fig. 2, the antenna unit 20 may include: metal groove 201, M feed portions 202 disposed at the bottom of metal groove 201, and M feed arms 203 disposed within metal groove 201.

Each of the M feeding portions 202 may be electrically connected to one feeding arm and may be insulated from the metal groove 201, a distance between each of the M feeding arms 203 and the inner surface of the bottom of the metal groove 201 may be greater than one half of the first distance and may be coupled to the metal groove 201, and M is a positive integer.

It should be noted that, in the embodiment of the present invention, in order to illustrate the structure of the antenna unit more clearly, fig. 2 is an exploded view of the antenna unit, that is, an exploded view of the antenna unit is illustrated in a state where all components of the antenna unit are separated. In practical implementation, the M feeding portions and the M feeding arms are disposed in the metal groove, that is, the metal groove, the M feeding portions and the M feeding arms form an integral body, so as to form an antenna unit provided in the embodiment of the present invention.

In addition, the power feeding portion 202 and the power feeding arm 203 in fig. 2 are not shown in an electrically connected state, and in actual implementation, the power feeding portion 202 may be electrically connected to the power feeding arm 203.

In the embodiment of the present invention, since the M feeding arms are disposed in the metal groove, in order to ensure that the antenna unit provided in the embodiment of the present invention can effectively radiate electromagnetic waves, that is, the antenna unit can effectively radiate energy, and ensure the impedance matching characteristic of the antenna unit (the impedance of the energy transmitted to the feeding arm by the feeding portion is 50 ohms), an appropriate distance, that is, the first distance, should be maintained between the feeding arm and the inner surface of the bottom of the metal groove.

It should be noted that, in practical implementation, the distance between each of the M feeding arms and the inner surface of the bottom of the metal groove may also be any other possible value, which may be determined according to practical use requirements, and the embodiment of the present invention is not limited.

In order to more clearly describe the antenna unit and the operating principle thereof provided by the embodiment of the present invention, an example of the operating principle of the antenna unit for transmitting and receiving signals provided by the embodiment of the present invention is specifically described below by taking one antenna unit as an example.

Illustratively, in conjunction with fig. 2 described above, in the embodiment of the present invention, when the terminal device sends a 5G millimeter wave signal, the signal source in the terminal device sends an ac signal, and the signal source may be transmitted to the feeding arm through the feeding portion. Then, after the feeding arm receives the alternating current signal, the feeding arm may be coupled with the metal groove, so that the metal groove generates an induced alternating current signal, and then the metal groove may radiate electromagnetic waves of multiple frequencies to the outside (since there may be multiple current paths of induced currents generated by the feeding arm and the metal groove coupling, for example, there may be multiple current paths such as a current path from the feeding arm to the metal groove and then to the feeding arm, a current path formed on the metal groove, and the like, there may also be multiple frequencies of electromagnetic waves radiated by the current on the feeding arm via the metal groove). Thus, the terminal device can transmit signals with different frequencies through the antenna unit provided by the embodiment of the invention.

For another example, in the embodiment of the present invention, when the terminal device receives a 5G millimeter wave signal, electromagnetic waves in a space where the terminal device is located may excite the metal groove, so that the metal groove may generate an induced current (i.e., an induced ac signal). After the metal groove generates the induced ac signal, the metal groove may be coupled with the feeding arm such that the feeding arm generates the induced ac signal. Then, the feeding arm may input the alternating current signal to a receiver in the terminal device through the feeding section, so that the terminal device may receive a 5G millimeter wave signal transmitted by another device. Namely, the terminal device can receive signals through the antenna unit provided by the embodiment of the invention.

The performance of the antenna unit provided by the embodiment of the present invention is exemplarily described below with reference to fig. 3.

Exemplarily, as shown in fig. 3, a reflection coefficient diagram of an antenna unit provided in an embodiment of the present invention is shown when the antenna unit operates. When the return loss is less than-6 dB (decibel), the frequency range covered by the antenna unit may be 24.25GHz-41.846GHz, which may include multiple millimeter wave frequency bands (e.g., n257, n258, n260, and n 261); when the return loss is less than-10 dB, the antenna unit may cover a frequency range of 25.4GHz-29.5GHz and 36.256-40.4GHz, which may also include a plurality of major millimeter wave frequency bands (e.g., n257, n260, and n 261). Thus, the antenna unit provided by the embodiment of the present invention may cover most 5G millimeter wave frequency bands (e.g., the mainstream 5G millimeter wave frequency bands of n257, n258, n260, and n261), so that the antenna performance of the terminal device may be improved.

It should be noted that, in the embodiment of the present invention, when the return loss of one antenna unit is less than-6 dB, the antenna unit can meet the actual use requirement; the performance of an antenna element is better when its return loss is less than-10 dB. As can be seen from fig. 3, the points a, b, c and d in fig. 3 are used to mark the values of the return loss, the value of the return loss marked by the point a is-6.3246, the value of the return loss marked by the point b is-10.359, the value of the return loss marked by the point c is-10.087, and the value of the return loss marked by the point d is-5.9607. Namely, the antenna unit provided by the embodiment of the invention can ensure better performance on the basis of meeting the actual use requirement.

The embodiment of the invention provides an antenna unit, wherein a feed arm can be coupled with a metal groove, so that the feed arm can be coupled with the metal groove under the condition that the feed arm receives an alternating current signal, so that the metal groove can generate an induced alternating current signal, and the feed arm and the metal groove can radiate electromagnetic waves with certain frequency; moreover, since there may be a plurality of current paths of the induced current generated by coupling the feeding arm and the metal groove (for example, there may be a plurality of current paths such as a current path from the feeding arm to the metal groove and then to the feeding arm, and a current path formed on the metal groove), the frequency of the electromagnetic wave generated by the current on the feeding arm via the metal groove may also be a plurality of frequencies, so that the antenna unit may cover a plurality of frequency bands, and the frequency band covered by the antenna unit may be increased.

Optionally, in the embodiment of the present invention, the metal groove may be a rectangular groove or a circular groove.

In practice, the metal groove may also be a metal groove with any other possible shape, which may be determined according to actual use requirements, and the embodiment of the present invention is not limited.

It should be noted that, in the embodiment of the present invention, when the metal groove is a rectangular groove, the opening shape of the metal groove may be rectangular; when the metal groove is a circular groove, the opening of the metal groove may be circular.

Optionally, in the embodiment of the present invention, the shape of the cross section of the metal groove may be a regular shape such as a circle, a rectangle, a hexagon, or the like, and the shape of the cross section of the metal groove may also be an irregular shape, which may be determined specifically according to actual use requirements, and the embodiment of the present invention is not limited.

In the embodiment of the invention, because the performances of the antenna units formed by the metal grooves with different shapes may be different, the metal grooves with the proper shapes can be selected as the metal grooves in the antenna unit provided by the embodiment of the invention according to the actual use requirement of the antenna unit, so that the antenna unit can work in a 5G millimeter wave frequency band.

Furthermore, because the shape of the antenna unit formed by the metal grooves with regular shapes is relatively stable, the performance of the antenna unit provided by the embodiment of the invention can be relatively stable by setting the metal grooves to be rectangular grooves or circular grooves, so that the performance of the antenna unit can be improved.

Optionally, in the embodiment of the present invention, the M feeding portions 202 may penetrate through the bottom of the metal groove 201.

In particular, in practical implementation, as shown in fig. 2, the first end 202a of the feeding portion may be electrically connected to the feeding arm 203, and the second end (not shown in fig. 2) of the feeding portion may be electrically connected to one signal source in the terminal device (e.g., a 5G signal source in the terminal device). In this way, the current of the signal source in the terminal device can be transmitted to the feed arm through the feed portion, and then coupled to the metal groove through the feed arm, so that the metal groove can generate an induced current, and the metal groove can radiate electromagnetic waves with a certain frequency, and thus, the antenna unit provided by the embodiment of the invention can radiate 5G millimeter wave signals in the terminal device.

Alternatively, in the embodiment of the present invention, the feeding arm in one feeding structure (i.e., any one of the M feeding structures) may be a symmetrically-shaped feeding arm. For example, the feeding arms in one feeding structure may be symmetrical in the horizontal direction, may be symmetrical in the vertical direction, and the like. The method can be determined according to actual use requirements, and the embodiment of the invention is not limited.

Optionally, in an embodiment of the present invention, the feeding arm in one feeding structure (i.e., any one of the M feeding structures) may be any one of the following feeding arms: a rectangular feed arm, a "T" feed arm, and a "Y" feed arm.

Of course, in practical implementation, the feeding arm in the above-mentioned one feeding structure may also be any other possible feeding arm. The method can be determined according to actual use requirements, and the embodiment of the invention is not limited.

Optionally, in this embodiment of the present invention, the feeding arms in the M feeding structures may be the same feeding arm (for example, all the feeding arms in the M feeding structures are "Y" -shaped feeding arms), or different feeding arms (for example, part of the feeding arms in the M feeding structures are "T" -shaped feeding arms, and another part of the feeding arms are "Y" -shaped feeding arms). The method can be determined according to actual use requirements, and the embodiment of the invention is not limited.

For example, the feeding arms in the M feeding structures may be all "T" shaped feeding arms 203 as shown in fig. 2, or all "Y" shaped feeding arms 203 as shown in fig. 4.

In the embodiment of the present invention, since the coupling amount of the feeding arms in different forms (such as shape, material, structure, and the like) may be different when the feeding arms are coupled with the metal groove, and the impedance requirements of the feeding arms in different forms may also be different, that is, the influence of the feeding arms in different forms on the working performance of the antenna unit may be different, a suitable feeding arm may be selected according to the actual use requirement of the antenna unit, so that the antenna unit may work in a suitable frequency range.

Optionally, in this embodiment of the present invention, the M feeding arms may be four feeding arms (i.e., M is 4), the four feeding arms may form two feeding arm groups, each feeding arm group may include two symmetrically disposed feeding arms, and a symmetry axis of one feeding arm group is orthogonal to a symmetry axis of another feeding arm group.

The signal source electrically connected with the first feed part and the signal source electrically connected with the second feed arm have the same amplitude and the phase difference is 180 degrees, and the first feed part and the second feed part are respectively electrically connected with two feed arms in the same feed arm group.

In the embodiment of the present invention, since the antenna unit may include two feeding arm sets, the terminal device may respectively send or receive signals through the two feeding arm sets in the antenna unit, that is, the MIMO technology may be implemented by the antenna unit provided in the embodiment of the present invention, so that the communication capacity and the communication rate of the antenna unit may be improved, that is, the data transmission rate of the antenna unit may be improved.

It should be noted that, for convenience of description and understanding, the two feeding arm groups are divided into a first feeding arm group and a second feeding arm group in the following embodiments. The first feeding arm group and the second feeding arm group respectively comprise two symmetrically arranged feeding arms, and the symmetry axis of the first feeding arm group is orthogonal to the symmetry axis of the second feeding arm group.

Optionally, in an embodiment of the present invention, the first feeding arm set and the second feeding arm set may be two feeding arm sets with different polarizations. In particular, the first feeding arm set may be a feeding arm set of a first polarization, and the second feeding arm set may be a feeding arm set of a second polarization.

Illustratively, in conjunction with fig. 2, as shown in fig. 5, the first feeding arm group may include a feeding arm 2030 and a feeding arm 2031, and the second feeding arm group may include a feeding arm 2032 and a feeding arm 2033. The first feeding arm group formed by the feeding arm 2030 and the feeding arm 2031 may be a feeding arm group with a first polarization (for example, a feeding arm group with a +45 ° polarization); the second feed arm group formed by the feed arm 2032 and the feed arm 2033 may be a feed arm group of a second polarization (for example, a feed arm group of-45 ° polarization).

Optionally, in this embodiment of the present invention, the first polarization and the second polarization may be polarizations in different directions.

For example, the first polarization may be +45 ° polarization or horizontal polarization; the second polarization may be-45 ° polarization or vertical polarization.

Of course, in practical implementation, the first polarization and the second polarization may be any other possible polarization. The method can be determined according to actual use requirements, and the embodiment of the invention is not limited.

In the embodiment of the present invention, the first feeding arm group and the second feeding arm group may be two feeding arm groups with different polarizations (a first polarization and a second polarization), so that the antenna unit provided in the embodiment of the present invention may form a dual-polarized antenna unit, and thus, the wireless connection capability of the antenna unit may be improved, and thus, the probability of communication disconnection of the antenna unit may be reduced, that is, the communication capability of the antenna unit may be improved.

Optionally, in this embodiment of the present invention, for two feed arms in the first feed arm group, amplitudes of signal sources electrically connected to the two feed portions electrically connected to the two feed arms may be equal, and phases of the signal sources electrically connected to the two feed portions electrically connected to the two feed arms may differ by 180 degrees.

Accordingly, for two feed arms in the second feed arm group, the magnitudes of the signal sources electrically connected to the two feed portions electrically connected to the two feed arms may be equal, and the phases of the signal sources electrically connected to the two feed portions electrically connected to the two feed arms may be different by 180 degrees.

In the embodiment of the present invention, when one feeding arm in the first feeding arm group is in the working state, the other feeding arm in the first feeding arm group may also be in the working state. Correspondingly, when one feeding arm in the second feeding arm group is in the working state, the other feeding arm in the second feeding arm group can also be in the working state. I.e. the feeding arms in the same set of feeding arms may be operated simultaneously.

Optionally, in the embodiment of the present invention, when the feeding arm in the first feeding arm group is in the working state, the feeding arm in the second feeding arm group may be in the working state, or may not be in the working state. The method can be determined according to actual use requirements, and the embodiment of the invention is not limited.

In the embodiment of the present invention, because the data transmission rate of the antenna unit adopting the differential orthogonal feeding manner is higher, the feeding manner adopted by the antenna unit provided by the embodiment of the present invention is the differential orthogonal feeding manner by orthogonally distributing the first feeding arm group and the second feeding arm group, and the amplitudes of the signal source connected to the first feeding portion and the signal source connected to the second feeding portion are equal to each other, and the phase difference is 180 degrees, so that the data transmission rate of the antenna unit can be further increased, that is, the communication capacity and the communication rate of the antenna unit can be further increased.

Optionally, in the embodiment of the present invention, the two feeding arm groups may be located on the same plane, and the feeding arms in any one feeding arm group may be distributed on a symmetry axis of another feeding arm group.

It can be understood that, in the case that the two feeding arm sets are located on the same plane, the distances between the feeding arms in the two feeding arm sets and the inner surface of the bottom of the metal groove are equal.

Illustratively, as shown in fig. 5, the first feeding arm group and the second feeding arm group are both located on the first plane S1, that is, the feeding arm 2030 and the feeding arm 2031 in the first feeding arm group are located on the first plane S1, and the feeding arm 2032 and the feeding arm 2033 in the second feeding arm group are also located on the first plane S1. And as shown in fig. 5, the feed arm 2030 and the feed arm 2031 in the first feed arm group are located on the symmetry axis (i.e., the first symmetry axis) L1 of the second feed arm group, and the feed arm 2032 and the feed arm 2033 in the second feed arm group are located on the symmetry axis (i.e., the second symmetry axis) L2 of the first feed arm group. Optionally, in the embodiment of the present invention, the feeding arms in the M feeding structures may all be located on the same plane.

In the embodiment of the present invention, under the condition that the distances between the feeding arms of the M feeding arms and the inner surface of the bottom of the metal groove are equal, it is convenient to control the parameters of the coupling between the M feeding arms and the target metal groove, such as the induced current generated in the coupling process, so that the distances between the feeding arms of different feeding arm sets and the inner surface of the bottom of the metal groove are equal by arranging the two feeding arm sets on the same plane, which is convenient to control the working state of the antenna unit provided by the embodiment of the present invention.

Optionally, in an embodiment of the present invention, the metal groove may be a rectangular groove, the two feeding arm sets may include a first feeding arm set and a second feeding arm set, the feeding arms in the first feeding arm set may be distributed on a first diagonal line of the metal groove, and the feeding arms in the second feeding arm set may be distributed on a second diagonal line of the metal groove.

Optionally, in an embodiment of the present invention, the first diagonal line and the second diagonal line may be two diagonal lines in a cross section of the metal groove, the cross section being parallel to a surface where an opening of the metal groove is located.

In the embodiment of the present invention, the feeding portions electrically connected to the feeding arms in the first feeding arm group may be distributed on a third diagonal line of the metal groove, and the feeding portions electrically connected to the feeding arms in the second feeding arm group may be distributed on a fourth diagonal line of the metal groove. The third diagonal line may be parallel to the first diagonal line, and the fourth diagonal line may be parallel to the second diagonal line.

Illustratively, as shown in fig. 6, a top view of the antenna unit in the Z-axis direction (e.g., the coordinate system shown in fig. 2) is provided for the embodiment of the present invention. As can be seen from fig. 6, the opening shape of the metal groove 201 is rectangular (i.e. the metal groove is a rectangular groove), and the M feeding arms are disposed in the metal groove 201. Among them, the feeding arm 2030 and the feeding arm 2031 may be distributed on one diagonal (i.e., a first diagonal) L3 of the metal groove 201, and the feeding arm 2032 and the feeding arm 2033 may be distributed on the other diagonal (i.e., a second diagonal) L4 of the metal groove 201.

It should be noted that, since fig. 6 is a top view of the antenna unit provided by the embodiment of the present invention in the direction opposite to the Z axis, the coordinate system illustrated in fig. 6 only illustrates the X axis and the Y axis.

In addition, since the above-described M feeding arms are disposed in the metal groove, 201 in fig. 6 indicates an opening edge of the metal groove to indicate that the feeding arm 203 is disposed in the opening of the metal groove 201.

In the embodiment of the present invention, when the metal groove is a rectangular groove, a diagonal line is a longest line in the metal groove, and thus, by disposing the feeding arms in the two feeding arm groups on the diagonal lines of the metal groove (i.e., the first diagonal line and the second diagonal line), the number of current paths of induced currents generated by coupling each feeding arm group in the two feeding arm groups with the metal groove can be increased, so that the frequency range covered by the antenna unit provided by the embodiment of the present invention can be increased, and further, the performance of the antenna unit can be improved.

Furthermore, by arranging the feeding arms in the two feeding arm groups on the diagonal line of the metal groove, the length of a current path generated by coupling each feeding arm group in the two feeding arm groups with the metal groove can be increased, and therefore when the frequency range covered by the antenna unit is fixed, the volume of the antenna unit provided by the embodiment of the invention can be reduced to a certain extent.

Optionally, in this embodiment of the present invention, the antenna unit may further include a first insulator disposed in the metal groove, and the first insulator may carry the M feeding arms.

Wherein, for each of the M feeding portions, the feeding portion passing through the first insulator may be electrically connected to one feeding arm, respectively.

Optionally, in this embodiment of the present invention, the M feeding arms may be carried on the first insulator, or may be carried in the first insulator. The method can be determined according to actual use requirements, and the embodiment of the invention is not limited.

Exemplarily, as shown in fig. 7, a cross-sectional view of an antenna unit according to an embodiment of the present invention is provided. In fig. 7, the antenna unit may further include a first insulator 204 disposed within the metal groove 201. Wherein the M feed arms 203 are carried within the first insulator 204; for each of the M feeding portions 202 described above, a first end of the feeding portion may be electrically connected to the feeding arm 203 through the first insulator 204.

In addition, as can be seen from fig. 7, the distance a1 between the feed arm 203 and the bottom inner surface of the metal groove 201 (referred to simply as distance 1) is greater than one-half of the distance a2 between the opening surface of the metal groove 201 and the bottom inner surface of the metal groove 201 (referred to simply as distance 2).

Alternatively, in the embodiment of the present invention, the cross-sectional shape of the first insulator may be the same as the opening shape of the metal groove, for example, a rectangular shape or a circular shape.

In the embodiment of the present invention, the shape of the first insulator may be any shape that can meet the actual use requirement. The method can be determined according to actual use requirements, and the embodiment of the invention is not limited.

Optionally, in an embodiment of the present invention, a material of the first insulator may be any possible material such as plastic or foam. The method can be determined according to actual use requirements, and the embodiment of the invention is not limited.

Optionally, in an embodiment of the present invention, a material of the first insulator may be an insulating material with a relatively small relative dielectric constant and a relatively small loss tangent.

Illustratively, in the embodiment of the present invention, the relative dielectric constant of the material of the first insulator may be 2.53, and the loss tangent may be 0.003.

In an embodiment of the present invention, the first insulator may not only carry the M feeding arms, but also isolate the M feeding arms from the metal groove, so as to prevent interference between the M feeding arms and the metal groove.

In the embodiment of the present invention, on the premise of carrying the M feeding arms, the smaller the loss tangent value of the material of the first insulator is, the smaller the influence of the first insulator on the radiation effect of the antenna unit is. That is, the smaller the loss tangent value of the material of the first insulator, the smaller the influence of the first insulator on the operation performance of the antenna unit, and the better the radiation effect of the antenna unit.

Optionally, in this embodiment of the present invention, when the M feeding arms are carried on the first insulator, the antenna unit may further include a second insulator disposed in the metal groove, where the second insulator may be disposed on a first side of the first insulator, and the first side may be a side of the first insulator where the M feeding arms are located.

In the embodiment of the present invention, when the M feeding arms are carried on the first insulator, the M feeding arms may be exposed to the air, so that other external objects may interfere with the M feeding arms. By thus providing the second insulator on the first side of the first insulator, interference of the outside world with the M feed arms can be reduced.

Illustratively, in conjunction with fig. 2, as shown in fig. 8, the M feeding arms 203 are carried on a first insulator 204, and a second insulator 205 may be disposed on a first side B1 of the first insulator 204.

It should be noted that, in the embodiment of the present invention, in order to illustrate the structure of the antenna unit more clearly, fig. 8 is an exploded view of the antenna unit, that is, an exploded view of the antenna unit is illustrated in a state where all components of the antenna unit are separated. In practice, the first insulator and the second insulator are both disposed in the metal recess, and the second insulator is in contact with the first side of the first insulator.

Optionally, in this embodiment of the present invention, when the M feeding arms are carried on the first insulator and the second insulator is in contact with the first side of the first insulator, the M feeding arms may be embedded in the second insulator.

Alternatively, in the embodiment of the present invention, the cross-sectional shape of the second insulator may be the same as the opening shape of the metal groove, for example, a rectangular shape or a circular shape.

Of course, in practical implementation, the shape of the cross section of the second insulator may also be any other possible shape, which may be determined according to practical use requirements, and the embodiment of the present invention is not limited.

Optionally, in an embodiment of the present invention, a material of the second insulator may be the same as a material of the first insulator.

Optionally, in an embodiment of the present invention, a material of the second insulator may be any possible material such as plastic or foam. The method can be determined according to actual use requirements, and the embodiment of the invention is not limited.

Optionally, in an embodiment of the present invention, a material of the second insulator may be an insulating material with a relatively small relative dielectric constant and a relatively small loss tangent.

Illustratively, in the embodiment of the present invention, the relative dielectric constant of the material of the second insulator may be 2.5, and the loss tangent may be 0.001.

It should be noted that, in the embodiments of the present invention, on the premise of isolating the feeding arm in the M feeding structures from the outside, the smaller the loss tangent value of the material of the second insulator, the smaller the influence of the second insulator on the radiation effect of the antenna unit. That is, the smaller the loss tangent value of the material of the second insulator is, the smaller the influence of the second insulator on the operation performance of the antenna element is, and the better the radiation effect of the antenna element is.

Alternatively, in the embodiment of the present invention, as shown in fig. 7, the second insulator 205 may be flush with the surface of the metal groove 201 where the opening is located.

Of course, in practical implementation, the thickness of the second insulator may also be any other possible thickness, which may be determined according to practical use requirements, and the embodiment of the present invention is not limited.

In the embodiment of the invention, because the thicknesses of the second insulators are different, the performances of the antenna unit are possibly different, and therefore, the thickness of the second insulator can be set according to actual use requirements, so that the design of the antenna unit is more flexible.

Furthermore, when the surface of the second insulator is flush with the surface of the opening of the metal groove, the outer surface of the antenna unit provided by the embodiment of the invention is relatively flat, so that the outer surface of the antenna unit is relatively beautiful.

Optionally, in the embodiment of the present invention, as shown in fig. 7, the bottom of the metal groove 201 may further be provided with M through holes 206 penetrating through the bottom of the metal groove 201, and each feeding portion 202 of the M feeding portions may be respectively disposed in one through hole 206.

Optionally, in the embodiment of the present invention, the M through holes may be through holes with the same diameter.

Optionally, in the embodiment of the present invention, the M through holes may be distributed on a diagonal line of the metal groove. The specific distribution mode of the M through holes in the metal groove can be determined according to the distribution positions of the M feeding arms in the metal groove.

In the embodiment of the invention, as the through hole is simple to arrange in the metal groove and is easy to realize, the process that the feed part penetrates through the metal groove can be simplified by arranging the through hole penetrating through the bottom of the metal groove at the bottom of the metal groove and arranging the feed part in the through hole.

Optionally, in an embodiment of the present invention, a third insulator may be disposed in each of the M through holes, and the third insulator may wrap the feeding portion disposed in the through hole.

In an embodiment of the present invention, the third insulator wraps the feeding portion disposed in the through hole, so that the feeding portion is fixed in the through hole.

Illustratively, as shown in fig. 7, through holes 206 are provided at the bottom of the metal grooves 201, a third insulator 207 is provided in each through hole 206, and the feeding portion 202 may be electrically connected to the feeding arm 203 through the third insulator 207 provided in the through hole 206.

It should be noted that, in fig. 7, the signal source 30 electrically connected to one end of the feeding portion 202 (for example, the second end of the feeding portion) may be a millimeter wave signal source in the terminal device.

In an embodiment of the present invention, the third insulator may be made of an insulating material having a relatively small relative permittivity.

Illustratively, the material of the third insulator may be any possible material such as a foam material or a plastic material.

Optionally, in an embodiment of the present invention, the third insulator may be made of the same insulating material as the first insulator, or may be made of a different insulating material. The method can be determined according to actual use requirements, and the embodiment of the invention is not limited.

In the embodiment of the present invention, the third insulator, the feeding portion, and the through hole provided in the metal groove together constitute a coaxial transmission structure with a characteristic impedance of 50 ohms, and on one hand, since the diameter of the through hole is larger than that of the feeding portion in the feeding structure, when the feeding portion in the feeding structure is provided in the through hole, the feeding portion in the feeding structure may not be fixed in the through hole, and therefore, by providing the third insulator in the through hole and disposing the third insulator to surround the feeding portion in the feeding structure, the feeding portion in the feeding structure may be fixed in the through hole. On the other hand, since the metal groove and the feeding portion in the feeding structure are both made of metal materials, interference may occur between the metal groove and the feeding portion in the feeding structure in the working process of the antenna unit, so that the feeding portion in the feeding structure and the metal groove may be isolated by adding the third insulator in the through hole, and the feeding portion in the feeding structure is insulated from the metal groove, thereby enabling the antenna performance of the terminal device to be more stable.

In the embodiment of the present invention, the antenna units shown in the above drawings are all exemplarily described by referring to one drawing in the embodiment of the present invention. In specific implementation, the antenna units shown in the above drawings may also be implemented in combination with any other drawings that may be combined, which are illustrated in the above embodiments, and are not described herein again.

An embodiment of the present invention provides a terminal device, where the terminal device may include the antenna unit provided in any one of fig. 2 to 8. For the description of the antenna unit, reference may be specifically made to the description of the antenna unit in the foregoing embodiments, and details are not described here.

The terminal equipment in the embodiment of the invention can be a mobile terminal or a non-mobile terminal. For example, the mobile terminal may be a mobile phone, a tablet computer, a notebook computer, a palm top computer, a vehicle-mounted terminal, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, a Personal Digital Assistant (PDA), or the like, and the non-mobile terminal may be a Personal Computer (PC), a Television (TV), or the like, and embodiments of the present invention are not limited in particular.

Optionally, in the embodiment of the present invention, at least one first groove may be disposed in the housing of the terminal device, and each antenna unit may be disposed in one first groove.

In this embodiment of the present invention, at least one first groove may be disposed in a housing of a terminal device, and the antenna unit provided in this embodiment of the present invention is disposed in the first groove, so as to integrate at least one antenna unit provided in this embodiment of the present invention in the terminal device.

Optionally, in this embodiment of the present invention, the first groove may be disposed in a frame of a housing of the terminal device.

In the embodiment of the present invention, as shown in fig. 9, the terminal device 4 may include a housing 40. The case 40 may include a first metal frame 41, a second metal frame 42 connected to the first metal frame 41, a third metal frame 43 connected to the second metal frame 42, and a fourth metal frame 44 connected to both the third metal frame 43 and the first metal frame 41. The terminal device 4 may further include a floor 45 connected to both the second metal frame 42 and the fourth metal frame 44, and a first antenna 46 (specifically, these metal frames may also be a part of the first antenna) disposed in an area surrounded by the third metal frame 43, a part of the second metal frame 42, and a part of the fourth metal frame 44. Wherein, the second metal frame 42 is provided with a first groove 47. Therefore, the antenna unit provided by the embodiment of the invention can be arranged in the first groove, so that the terminal equipment can comprise the array antenna module formed by the antenna unit provided by the embodiment of the invention, and the design of integrating the antenna unit provided by the embodiment of the invention in the terminal equipment can be further realized.

In the embodiment of the present invention, the floor may be a PCB or a metal middle frame in the terminal device, or may be any portion that can be used as a virtual ground, such as a display screen of the terminal device.

In the embodiment of the present invention, the first antenna may be a communication antenna of a system such as a second generation mobile communication system (i.e., a 2G system), a third generation mobile communication system (i.e., a 3G system), and a fourth generation mobile communication system (i.e., a 4G system) of the terminal device. The antenna unit integrated in the terminal device in the embodiment of the present invention (the antenna unit formed by the metal groove and the M feeding structures and the first insulator located in the metal groove) may be an antenna of a 5G system of the terminal device.

Optionally, in the embodiment of the present invention, the first metal frame, the second metal frame, the third metal frame, and the fourth metal frame may be sequentially connected end to form a closed frame; or, part of the first metal frame, the second metal frame, the third metal frame and the fourth metal frame may be connected to form a semi-enclosed frame; or, the first metal frame, the second metal frame, the third metal frame and the fourth metal frame may not be connected to each other to form an open frame. The method can be determined according to actual use requirements, and the embodiment of the invention is not limited.

It should be noted that the frame included in the casing 40 shown in fig. 9 is an exemplary closed frame formed by sequentially connecting the first metal frame 41, the second metal frame 42, the third metal frame 43, and the fourth metal frame 44 end to end, and does not limit the embodiment of the present invention. For the frames formed by other connection manners (part of the frames are connected or all the frames are not connected to each other) among the first metal frame, the second metal frame, the third metal frame and the fourth metal frame, the implementation manner of the frames is similar to that provided by the embodiment of the present invention, and in order to avoid repetition, the description is omitted here.

Optionally, in the embodiment of the present invention, the at least one first groove may be disposed in the same frame of the housing, or may be disposed in different frames. The method can be determined according to actual use requirements, and the embodiment of the invention is not limited.

Optionally, in the embodiment of the present invention, a plurality of first grooves may be disposed on a housing of the terminal device, so that a plurality of antenna units provided in the embodiment of the present invention may be disposed in the terminal device, and thus the terminal device may include a plurality of antenna units, so as to improve antenna performance of the terminal device.

In the embodiment of the present invention, when the terminal device is provided with a plurality of antenna elements, according to the structure of the antenna elements, the distance between two adjacent first grooves may be reduced, that is, the distance between two adjacent antenna elements may be reduced, so that the scanning angle of the beam of the electromagnetic wave generated by the feeding arm and the metal groove in the antenna element may be increased when the terminal device includes a smaller number of antenna elements, and thus the coverage of the millimeter wave antenna communication of the terminal device may be increased.

In the embodiment of the present invention, at least one first groove may be disposed on a housing of a terminal device, and one antenna unit provided in the embodiment of the present invention is disposed in each first groove, so that at least one antenna unit provided in the embodiment of the present invention may be integrated in the terminal device, so as to improve antenna performance of the terminal device.

Optionally, in this embodiment of the present invention, the metal groove in the antenna unit may be a part of a housing of the terminal device. It will be appreciated that the metal recess may be a recess provided in the housing of the terminal device.

Optionally, in this embodiment of the present invention, the casing of the terminal device may be a radiator of a cellular antenna in the terminal device and/or a radiator of a non-cellular antenna in the terminal device. The method can be determined according to actual use requirements, and the embodiment of the invention is not limited.

Optionally, in the embodiment of the present invention, the metal groove may be disposed on a metal frame of a housing of the terminal device.

Illustratively, as shown in fig. 10, at least one metal groove 201 may be disposed in the housing 40 of the terminal device 4 provided in the embodiment of the present invention, and the M feeding arms and the M feeding portions included in the antenna unit may be disposed in the metal groove (in practice, the metal groove is not visible in the angle of the terminal device illustrated in fig. 10).

Optionally, in the embodiment of the present invention, one metal groove may be disposed in any one of the first metal frame, the second metal frame, the third metal frame, and the fourth metal frame of the housing. The method can be determined according to actual use requirements, and the embodiment of the invention is not limited.

It is to be understood that, in the case that the metal groove is disposed on a frame of the housing (for example, the first metal frame, etc.), a side wall, a bottom, and the like of the metal groove included in the metal groove structure in the embodiment of the present invention are all part of the terminal device, and may specifically be part of the frame of the housing provided in the embodiment of the present invention.

Optionally, in the embodiment of the present invention, the casing of the terminal device may also be used as a radiator of a non-millimeter wave antenna in the terminal device, so that a space occupied by the antenna in the terminal device may be greatly reduced.

In the embodiment of the present invention, in the above fig. 10, the metal groove 201 is disposed on the first metal frame 41 of the housing 40, and the opening direction of the metal groove 201 is the positive direction of the Z axis of the coordinate system shown in fig. 10.

It can be understood that, in the embodiment of the present invention, as shown in fig. 10, when the metal groove is disposed in the second metal frame of the housing, the opening direction of the metal groove may be the X-axis forward direction; when the metal groove is arranged on the third metal frame of the shell, the opening direction of the metal groove can be the Z-axis direction; when the metal groove is disposed on the fourth metal frame of the housing, the opening direction of the metal groove may be the X-axis direction.

Optionally, in the embodiment of the present invention, a plurality of metal grooves may be disposed in a housing of the terminal device, and M feeding arms and M feeding portions in the embodiment of the present invention are disposed in each metal groove, so that a plurality of antenna units provided in the embodiment of the present invention may be integrated in the terminal device, and thus, the antenna units may form an antenna array, so that the antenna performance of the terminal device may be improved.

In the embodiment of the present invention, as shown in fig. 11, when the antenna unit provided in the embodiment of the present invention radiates a signal with a frequency of 28GHz (that is, the antenna unit radiates a low-frequency signal), the radiation pattern of the antenna unit is; as shown in fig. 12, when the antenna unit provided in the embodiment of the present invention radiates a signal with a frequency of 39GHz (i.e., the antenna unit radiates a high-frequency signal), the radiation pattern of the antenna unit radiates. As can be seen from fig. 11 and 12, the maximum radiation direction of the antenna unit when radiating the high-frequency signal is the same as the maximum radiation direction of the antenna unit when radiating the low-frequency signal, so that the antenna unit provided in the embodiment of the present invention is suitable for forming an antenna array. Therefore, the terminal device may be provided with at least two metal grooves, and each metal groove is provided with the M feeding arms, the M feeding portions and other components, so that the terminal device includes a plurality of antenna units provided by the embodiments of the present invention, and thus the terminal device may include an antenna array formed by the antenna units, and further, the antenna performance of the terminal device may be improved.

Optionally, in this embodiment of the present invention, when a plurality of antenna units provided in this embodiment of the present invention are integrated in a terminal device, a distance between two adjacent antenna units (that is, a distance between two adjacent metal grooves) may be determined according to an isolation of the antenna units and a scanning angle of an antenna array formed by the antenna units. The method can be determined according to actual use requirements, and the embodiment of the invention is not limited.

Optionally, in the embodiment of the present invention, the number of the metal grooves provided in the housing of the terminal device may be determined according to the size of the metal groove and the size of the housing of the terminal device, which is not limited in the embodiment of the present invention.

Exemplarily, as shown in fig. 13, a bottom view of a plurality of antenna units provided on a housing according to an embodiment of the present invention in a Z-axis forward direction (a coordinate system shown in fig. 10) is provided. Assuming that the metal groove is a rectangular groove, and the number of the feeding arms and the feeding portions is 4 (i.e., M is 4), as shown in fig. 13, a plurality of antenna units provided by the embodiment of the present invention are disposed on the third metal frame 43 (each antenna unit is formed by a metal groove 201 on the housing and 4 feeding arms 203 and 4 feeding portions (not shown in fig. 13) located in the metal groove).

In the embodiment of the present invention, the above-mentioned fig. 13 is an example of 4 antenna units disposed on the third metal frame, and does not limit the embodiment of the present invention at all. It can be understood that, in a specific implementation, the number of the antenna units disposed on the third metal frame may be determined according to an actual use requirement, and the embodiment of the present invention is not limited at all.

The embodiment of the invention provides terminal equipment, which comprises an antenna unit. The antenna unit may include a metal groove, M feeding portions disposed at a bottom of the metal groove, and M feeding arms disposed in the metal groove; each of the M feeding portions is electrically connected with one feeding arm and insulated from the metal groove, the distance between each of the M feeding arms and the inner surface of the bottom of the metal groove is greater than one half of a first distance, the first distance is coupled with the metal groove, the first distance is the distance between the surface where the opening of the metal groove is located and the inner surface of the bottom of the metal groove, and M is a positive integer. According to the scheme, the feed arm can be coupled with the metal groove, so that the feed arm can be coupled with the metal groove under the condition that the feed arm receives an alternating current signal, the metal groove can generate an induced alternating current signal, and the feed arm and the metal groove can radiate electromagnetic waves with certain frequency; moreover, since there may be a plurality of current paths of the induced current generated by coupling the feeding arm and the metal groove (for example, there may be a plurality of current paths such as a current path from the feeding arm to the metal groove and then to the feeding arm, and a current path formed on the metal groove), the frequency of the electromagnetic wave generated by the current on the feeding arm via the metal groove may also be a plurality of frequencies, so that the antenna unit may cover a plurality of frequency bands, and the frequency band covered by the antenna unit may be increased.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (12)

1. An antenna unit, characterized in that the antenna unit comprises: the feed circuit comprises a metal groove, M feed parts and M feed arms, wherein the M feed parts are arranged at the bottom of the metal groove;

each of the M feeding portions is electrically connected with one feeding arm and insulated from the metal groove, the distance between each of the M feeding arms and the inner surface of the bottom of the metal groove is greater than one half of a first distance, the first distance is coupled with the metal groove, the surface where an opening of the metal groove is located is the distance between the surface and the inner surface of the bottom of the metal groove, and M is a positive integer.

2. The antenna element of claim 1, wherein said metal groove is a rectangular groove or a circular groove.

3. The antenna element of claim 1, wherein said M feed portions extend through said metal groove bottom.

4. The antenna unit of claim 1, wherein the M feed arms are four feed arms, the four feed arms form two feed arm groups, each feed arm group comprises two feed arms symmetrically arranged, and a symmetry axis of one feed arm group is orthogonal to a symmetry axis of another feed arm group;

the signal source electrically connected with the first feed portion and the signal source electrically connected with the second feed portion have the same amplitude and the phase difference is 180 degrees, and the first feed portion and the second feed portion are feed portions respectively electrically connected with two feed arms in the same feed arm group.

5. The antenna element of claim 4, wherein said two sets of feed arms are located on the same plane, and the feed arms of any one set of feed arms are distributed on the symmetry axis of the other set of feed arms.

6. The antenna element of claim 4, wherein said metal recess is a rectangular recess, and wherein said two sets of feed arms comprise a first set of feed arms and a second set of feed arms, the feed arms of said first set of feed arms being distributed along a first diagonal of said metal recess, and the feed arms of said second set of feed arms being distributed along a second diagonal of said metal recess.

7. The antenna element of claim 1, further comprising a first insulator disposed within said metal groove, said first insulator carrying said M feed arms;

wherein, for each of the feeding portions, the feeding portion passing through the first insulator is electrically connected to one feeding arm, respectively.

8. The antenna element of claim 7, wherein said M feed arms are carried on said first insulator;

the antenna unit further comprises a second insulator arranged in the metal groove, the second insulator is arranged on a first side of the first insulator, and the first side is the side, where the M feed arms are located, in the first insulator.

9. The antenna element of claim 8, wherein said second dielectric body is flush with a surface of said metal recess at which said opening is located.

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

11. A terminal device according to claim 10, characterized in that at least one first recess is provided in the housing of the terminal device, each antenna element being arranged in one first recess.

12. A terminal device according to claim 10, characterised in that the metal recess in the antenna unit is part of the housing of the terminal device.