TWI632732B - Electronic device and antenna unit thereof - Google Patents

Abstract

The electronic device includes a main body and an antenna unit. The main body has an accommodation space. The antenna unit is disposed in the accommodation space and includes a dielectric member and a tri-metal portion. The dielectric member includes a first surface, a second surface, and a third surface. The first surface is vertically adjacent to the other two surfaces, and the second surface and the third surface are vertical to form a resonant cavity. The first metal part is disposed on the first surface and has a first slot and a feeding end for transmitting and receiving signals. The second metal portion is disposed on the second surface and has a second slot between the second metal portion and the first metal portion. The third metal portion is disposed on the third surface and is connected to a portion of the first metal portion and has a third slot between the third metal portion and the first metal portion. The second and third metal portions are respectively in electrical contact with the main body to be grounded. The signal is fed to the three metal parts through the feeding end and resonates with the resonant cavity to generate two antenna resonance frequency bands.

Description

Electronic device and antenna unit thereof

This disclosure relates to an electronic device, and more particularly to an electronic device with a dual-frequency resonant cavity antenna and an antenna unit thereof.

Today's electronic devices, such as notebook computers, tablet computers, and other products, are often designed with metal casings for aesthetic reasons. However, the electronic device of the all-metal body is limited by the metal case, which makes it difficult for the efficiency and radiation pattern of the internal antenna to perform well, which affects the signal transmission quality. Therefore, how to design an antenna with good antenna efficiency in an electronic device with an all-metal body is an important research and development issue.

In order to improve the antenna efficiency and signal transmission and reception quality of the internal antenna of an electronic product with a metal body, an electronic device is proposed in one technical aspect of this disclosure. The electronic device includes a main body and an antenna unit. The main body has an accommodation space, and the antenna unit is disposed in the accommodation space. The antenna unit includes a dielectric member, a first metal portion, a second metal portion, and a third metal portion. The dielectric element includes a first surface, a second surface, and a third surface, wherein the first surface is vertically adjacent to the second surface And the third surface, the second surface and the third surface are located on opposite sides to form a resonance cavity. The first metal part is disposed on the first surface and has a first slot and a feeding end, and the feeding end is used for receiving a signal. The second metal portion is disposed on the second surface and has a second slot between the second metal portion and the first metal portion. The third metal portion is disposed on the third surface and is connected to a part of the first metal portion. A third slot is provided between the third metal portion and the first metal portion. The second metal portion and the third metal portion are in electrical contact with the main body to be grounded. The signal is fed to the first metal part, the second metal part, and the third metal part through the feeding end and resonates with the resonant cavity to generate a first antenna resonance frequency band and a second antenna resonance frequency band.

In addition, in another technical aspect of the present disclosure, an antenna unit is proposed. The antenna unit includes a dielectric member, a first metal portion, a second metal portion, and a third metal portion. The dielectric member includes a first surface, a second surface, and a third surface, wherein the first surface is vertically adjacent to the second surface and the third surface, and the second surface and the third surface are on opposite sides to form a resonant cavity body. The first metal part is disposed on the first surface and has a first slot and a feeding end, and the feeding end is used for receiving a signal. The second metal portion is disposed on the second surface and grounded, and has a second slot between the second metal portion and the first metal portion. The third metal portion is disposed on the third surface and is grounded, and is connected to a portion of the first metal portion. A third slot is provided between the third metal portion and the first metal portion. The signal is fed to the first metal part, the second metal part, and the third metal part through the feeding end and resonates with the resonant cavity to generate a first antenna resonance frequency band and a second antenna resonance frequency band.

With the technology disclosed in this disclosure document, even if the electronic device uses a full metal body, the influence of the metal body on the internal antenna unit can be greatly reduced, and the antenna efficiency and signal transmission and reception quality can still have good performance. which performed.

100‧‧‧ electronic device

110‧‧‧display unit

120‧‧‧ Subject

130‧‧‧ top shell

140‧‧‧ bottom case

142‧‧‧accommodation space

144‧‧‧Edge of the fuselage

150‧‧‧Location

160, 360, 460‧‧‧ Antenna Unit

162, 362, 462‧‧‧ Dielectrics

510A, 510B, 520A, 520B, 530A, 530B‧‧‧ curves

610, 610B, 620B‧‧‧ Curve

A-A ’, B-B’‧‧‧ hatching

D1 ~ D12‧‧‧ points

F1‧‧‧feed side

g1‧‧‧pitch

G1‧‧‧ Ground

H1‧‧‧ first half

H2‧‧‧The second half

L1‧‧‧ Centerline

M1‧‧‧First Metal Department

M2‧‧‧Second Metal Department

M3‧‧‧Third Metal Department

M31‧‧‧Third Metal Department

M4‧‧‧ Fourth Metal Department

M5‧‧‧Fifth Metal Department

M6‧‧‧Sixth Metal Department

M7‧‧‧Seventh Metal Department

P1‧‧‧First side

P2‧‧‧Second Side

P3‧‧‧ Third Side

P4‧‧‧ Fourth side

P5‧‧‧ Fifth Side

P6‧‧‧ Sixth Side

S1‧‧‧The first slot

S2‧‧‧Second slot

S3‧‧‧The third slot

S4‧‧‧Fourth Slot

S5‧‧‧Fifth Slot

T1‧‧‧Trenching

w1, w3, w5‧‧‧ width

w2, w4, w6, w7, w8‧‧‧ length

FIG. 1A is a schematic diagram of an electronic device according to an embodiment of the disclosure document.

FIG. 1B is a schematic cross-sectional view of a main body of an embodiment of the disclosure document.

FIG. 2A is a schematic diagram of an antenna unit according to an embodiment of the disclosure.

FIG. 2B is a six-sided expanded view of an antenna unit according to an embodiment of the disclosure.

FIG. 3A is a schematic diagram of an antenna unit according to an embodiment of the disclosure.

FIG. 3B is a six-sided expanded view of an antenna unit according to an embodiment of the disclosure.

FIG. 4A is a schematic diagram of an antenna unit according to an embodiment of the disclosure.

FIG. 4B is a six-sided expanded view of an antenna unit according to an embodiment of the disclosure.

FIG. 5A is a relationship diagram of the antenna voltage standing wave ratio of the antenna unit against frequency according to an embodiment of the disclosure document.

FIG. 5B is a relationship diagram of antenna efficiency versus frequency of an antenna unit according to an embodiment of the disclosure.

FIG. 6A is a diagram showing a relationship between antenna isolation and frequency of an electronic device according to an embodiment of the disclosure.

FIG. 6B is a graph of antenna efficiency versus frequency for an electronic device according to an embodiment of the disclosure.

FIG. 7 is a schematic cross-sectional view of an electronic device according to an embodiment of the disclosure.

The following is a detailed description of the embodiments with the accompanying drawings, but the specific embodiments described are only used to explain the present invention and are not intended to limit the present invention, and the description of the structural operations is not intended to limit the order of execution, any The structures reassembled by the components, and the devices with equal effects are all covered by the disclosure of the present invention.

In addition, the drawings are only for illustrative purposes, and are not drawn according to their actual dimensions. As used herein, “electrically connected” or “electrically coupled” may refer to two or more components that are physically or indirectly electrically contacted.

The terms used throughout the specification and the scope of patent applications, unless otherwise specified, usually have the ordinary meaning of each term used in this field, in the content disclosed here, and in special content. Certain terms used to describe this disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art on the description of this disclosure.

Please refer to FIG. 1A, which is a schematic diagram of an electronic device 100 according to an embodiment of the disclosure. The electronic device 100 can be, for example, a notebook computer, a tablet computer, or any electronic product that can be equipped with an antenna transceiver device. In this example, the electronic device 100 is used as an example for description. In FIG. 1A, the length × width × thickness dimension of the electronic device 100 is, for example, 280 mm × 200 mm × 13 mm. The electronic device 100 includes a display unit 110 and a main body 120 that are pivotally connected to each other. The display unit 110 is a display screen for presenting an image interface. The main body 120 includes a top case 130, a bottom case 140, and an accommodation space 142. The accommodation space 142 is located between the top case 130 and the bottom case 140. The top case 130 may be used to mount input device components such as a keyboard. The top case 130 and the bottom case 140 of the main body 120 are respectively electrically connected to the system ground plane to be grounded.

The total thickness of the main body 120 is, for example, 7.5 mm. The accommodation space 142 may be provided with components such as a motherboard, a hard disk, a speaker, and / or an antenna. Wherein, the antenna is disposed at a pivotal position of the accommodation space 142 adjacent to the main body 120 and the display unit 110, such as two left and right positions 150 in FIG. 1A. It should be understood that the position 150 is a reserved installation position of the antenna unit, which may be multiple independent spaces, or may be a single connected space. The number of positions 150 and the number of antenna units can be designed according to actual needs. This disclosure only uses two positions of 150 and two antenna units as an example to simplify the description, and is not intended to limit the present invention.

Please refer to FIG. 1B together. FIG. 1B is a schematic cross-sectional view of the main body 120 according to an embodiment of the disclosure. Specifically, FIG. 1B shows a cross section of the main body 120 of FIG. 1A in the direction of the section line A-A '. As can be seen in FIG. 1B, the main body 120 further includes a fuselage edge 144. The fuselage edge 144 is disposed at the pivot joint of the main body 120 and the display unit 110. A through hole communicating with the accommodating space 142 may be excavated at the edge 144 of the fuselage as an exit of the radiation path of the internal antenna unit, a sound output hole of the audio device, and / or a heat dissipation hole of the electronic device 100.

In addition, the antenna unit 160 is disposed at the position 150 and is electrically connected to the top case 130 or the bottom case 140 through a conventional conductive cloth. The antenna unit 160 is at a distance g1 from the body edge 144 of the electronic device 100, and the distance g1 is, for example, less than 3.5 mm. It should be noted that the same antenna unit 160 or different antenna units may be provided in each position 150 of the electronic device 100. In the embodiment, the same antenna unit 160 is provided in the two positions 150, and one of the antenna units 160 serves as a main antenna and the other antenna unit 160 serves as an auxiliary antenna.

For the detailed structure of the antenna unit 160, refer to FIGS. 2A and 2B. FIG. 2A is a schematic diagram of the antenna unit 160 according to an embodiment of the disclosure. Specifically, FIG. 2A is a schematic view of the antenna unit 160 on the right in FIG. 1A as viewed from the direction of the section line B-B '. The length × width × height dimension of the antenna unit 160 is, for example, 45 mm × 14.5 mm × 5 mm, and it has a dielectric member 162. The dielectric member 162 is a cube and has six faces, such as a first face P1, a second face P2, a third face P3, a fourth face P4, a fifth face P5, and a sixth face P6. The first surface P1 and the fourth surface P4 are opposite to and vertically adjacent to the second surface P2, the third surface P3, the fifth surface P5, and the sixth surface P6, respectively. The second face P2 is opposed to the third face P3, and the fifth face P5 is opposed to the sixth face P6. As such, the dielectric member 162 can form a resonant cavity.

FIG. 2B is a six-sided expanded view of the antenna unit 160 in the embodiment of FIG. 2A. In FIG. 2B, the dielectric member 162 of the antenna unit 160 includes a first metal portion M1, a second metal portion M2, a third metal portion M3, a fourth metal portion M4, and a fifth metal portion M5. The first metal portion M1, the second metal portion M2, the third metal portion M3, the fourth metal portion M4, and the fifth metal portion M5 are made of a conductive material such as copper foil, for example. In the electronic device 100, the first metal portion M1 of the antenna unit 160 is disposed facing outward, that is, facing the body edge 144. It should be understood that, in this embodiment, the electronic device 100 has two antenna units 160, and each of the first metal portions M1 of the two antenna units 160 faces the edge 144 of the fuselage. Specifically, the two antenna units 160 of the electronic device 100 are, for example, Mirrored symmetrically.

The first metal portion M1 is disposed on the first surface P1. The size of the first metal portion M1 is, for example, 32 mm × 4 mm. The first metal portion M1 has a loop shape and has a first slot S1. The first slot S1 is located between the points D1 and D2, and its width w1 is, for example, 2 mm, and its length w2 is, for example, 25 mm. In addition, there is a feeding end F1 in the middle of the upper part of the first metal part M1 in the figure. The feeding end F1 is used to connect the positive end of a signal of a coaxial transmission line (not shown) to be coupled with a wireless signal generator. And use it to transmit and receive antenna signals.

The second metal portion M2 is disposed on the second surface P2 and makes electrical contact with the top case 130 of the main body 120 through the aforementioned conventional conductive cloth to further ground. The second metal portion M2 substantially covers the second surface P2. There is a second slot S2 between the second metal portion M2 and the first metal portion M1, and the second slot S2 is located on the first surface P1. The second slot S2 is between the points D3 and D4, and its width w3 is, for example, 1 mm, and its length w4 is, for example, 32 mm.

The third metal portion M3 is disposed on the third surface P3 and makes electrical contact with the bottom case 140 of the main body 120 through the aforementioned conventional conductive cloth to further ground. The third metal portion M3 substantially covers the third surface P3. The third metal portion M3 is connected to a portion of the first metal portion M1. A ground terminal G1 is provided at the upper center position of the third metal part M3 in the figure. The ground terminal G1 is used to connect to the negative terminal of the coaxial transmission line to be coupled to the signal negative terminal of the wireless signal generator and the system ground plane. In addition, there is a third slot S3 between the third metal portion M3 and the first metal portion M1, and the third slot S3 is located on the third surface P3. The third slot S3 is between the points D5 and D6, and its width w5 is, for example, 1 mm, and its length w6 is, for example, 12 mm.

The fourth metal portion M4 is disposed on the fourth surface P4, and substantially covers the fourth surface P4. The fourth metal portion M4 is connected to the second metal portion M2, the third metal portion M3, and the fifth metal portion M5 in the three-dimensional relationship diagram of FIG. 2A. The fourth metal portion M4 surrounds the fourth slot S4 with the first metal portion M1, the second metal portion M2, and the third metal portion M3. The fourth slot S4 is located on the first surface P1 and the sixth surface P6, and is between the points D3 and D7, as shown in the figure. The width of the fourth slot S4 is 5 mm of the thickness of the electronic device 100, and the length w7 is, for example, 19.5 mm.

The fifth metal portion M5 is provided on the fifth surface P5 and has a size of, for example, 7.5 mm × 5 mm. The fifth metal part M5 is connected to the second metal part M2, the third metal part M3, and the fourth metal M4 part in the three-dimensional relationship diagram of FIG. 2A, where the fifth metal part M5 is connected to the first metal part M1 and the second metal The portion M2 and the third metal portion M3 surround the fifth slot S5. The fifth slot S5 is located on the first surface P1 and the fifth surface P5, and is between the points D4 and D8, as shown in the figure. The width of the fifth slot S5 is the thickness 5 mm of the electronic device 100, and the length w8 is, for example, 8 mm.

The structure of the resonant cavity can be formed by the second metal portion M2 and the third metal portion M3 attached to the surface of the dielectric member 162, that is, the dielectric member 162 substantially serves as a resonant cavity of a signal. Therefore, the signal is fed to the first metal part M1, the second metal part M2, and the third metal part M3 through the feeding end F1 and resonates with the resonant cavity to generate the first antenna resonance frequency band and the second antenna resonance frequency band. Dual-band antenna resonance frequency band. In addition, the configuration of the fourth metal portion M4 and the fifth metal portion M5, and the capacitive coupling effect of the first slot S1 to the fifth slot S5 between the metal portions can cause the antenna unit 160 to resonate, for example, Wi-Fi A first antenna resonance frequency band of 2.4 GHz and a second antenna resonance frequency band such as Wi-Fi 5 GHz.

Specifically, the first antenna resonance frequency band is generated by coupling resonance between the first metal part M1 and the surrounding second slot S2, third slot S3, fourth slot S4, and fifth slot S5, and the second The sizes (w3 ~ w8) of the slot S2, the third slot S3, the fourth slot S4, and the fifth slot S5 are related to the frequency and impedance matching of the first antenna resonance frequency band. Therefore, by adjusting the size / coupling amount of the second slot S2, the third slot S3, the fourth slot S4, and the fifth slot S5, the antenna characteristics of Wi-Fi 2.4GHz can be changed.

The second antenna resonance frequency band is generated by the first metal part M1 with a first slot S1 inside, which is coupled and resonated in the form of a slit antenna. The size of the first slot S1 (w1, w2) Related to the frequency and impedance matching of the second antenna resonance frequency band. Therefore, by adjusting the size / coupling amount of the first slot S1, the antenna characteristics of Wi-Fi 5GHz can be changed. In addition, the antenna unit 160 is radiated, for example, through a heat dissipation port at the edge 144 of the fuselage facing the first metal portion M1 or a sound output hole of the audio device to transmit and receive wireless communication signals.

In another embodiment of the disclosure, the antenna unit 160 in the electronic device 100 can be combined with other electronic components to save the internal space of the electronic device 100 and further reduce the overall appearance. Please refer to FIG. 3A for a schematic diagram of the antenna unit 360 according to an embodiment of the present disclosure. The antenna unit 360 has a dielectric member 362 and is roughly divided into a first half H1 and a second half H2 by a center line L1. The second half H2 is substantially the same as the antenna unit 160, that is, the first metal part M1 to the fifth metal part M5 are all attached to the second The surface of half H2. Therefore, the antenna unit 360 can be regarded as the antenna unit 160 further extending out of the first half H1. For the detailed structure of the second half H2, please refer to the description of the aforementioned antenna unit 160.

In FIG. 3A, the first half H1 has a trench T1, and the trench T1 can be used to install electronic components such as speakers. In this embodiment, a sixth metal portion M6 is laid in the trench T1. Please also refer to the six-sided expanded view of the antenna unit 360 according to an embodiment of the disclosure document shown in FIG. 3B. The patterns of the second half H2 (the first metal part M1 to the fifth metal part M5) are the same as those in the second FIG. 2B. It should be noted that the third metal portion M3 of the second half H2 extends from the third surface P3 to the first half H1, and the fourth metal portion M4 of the second half H2 extends from the fourth surface P4 to the first Half H1, as shown. In addition, the sixth surface P6 of the antenna unit 360 further includes a third metal portion M31. The third metal portion M31 is connected to the third metal portion M3, the fourth metal portion M4, and the sixth metal portion M6 in the three-dimensional relationship diagram of FIG. 3A.

The sixth metal portion M6 is located between the points D9 and D10, and is electrically connected to the fourth metal portion M4 of the fourth surface P4 in the three-dimensional relationship diagram of FIG. 3A, and the third metal passing through the sixth surface P6. The portion M31 is electrically connected to the third metal portion M3 on the third surface P3. Generally speaking, electronic components usually have metal elements or materials. By laying a sixth metal portion M6 inside the trench T1, the influence of the electronic components installed in the trench T1 on the antenna unit 360 can be reduced, and the antenna unit 360 Improved antenna efficiency.

In still another embodiment of the disclosure, the sixth metal portion M6 may not be laid inside the trench T1 of the antenna unit 360. Please refer to FIG. 4A for a schematic diagram of the antenna unit 460 according to an embodiment of the present disclosure. Antenna sheet The element 460 is the same as the antenna unit 360, has a dielectric member 462, and is roughly divided into a first half H1 and a second half H2 by a center line L1, and the second half H2 is substantially the same as the antenna unit 160. In addition, in Fig. 4A, the first half H1 also has a trench T1. In the embodiment of the antenna unit 460, the difference from the antenna unit 360 is that the sixth metal portion M6 is not laid in the trench T1, but a seventh metal portion M7 is laid on the outer surface of the first half H1.

FIG. 4B illustrates a six-sided expanded view of the antenna unit 460 according to an embodiment of the disclosure. The patterns of the second half H2 (that is, the first metal part M1 to the fifth metal part M5) are the same as those in the second FIG. 2B. The third metal portion M3 of the second half H2 extends to the first half H1 to cover the third surface P3, and the fourth metal portion M4 of the second half H2 extends to the first half H1 to cover the fourth Face P4 as shown.

The seventh metal portion M7 is disposed on the first surface P1 and the sixth surface P6 and is located on the first half portion H1. The seventh metal portion M7 is located between the points D11 and D12. In the three-dimensional relationship diagram of FIG. 4A, the seventh metal portion M7 is electrically connected to the third metal portion M3 and the fourth metal portion M4. The seventh metal portion M7 is laid on the first surface P1 and the sixth surface P6 so that the trench T1 is surrounded by the third metal portion M3, the fourth metal portion M4, and the seventh metal portion M7, thereby reducing installation. The influence of the electronic components in the trench T1 on the antenna unit 460 improves the antenna efficiency of the antenna unit 460.

FIG. 5A shows the relationship between the antenna voltage standing wave ratio (VSWR) and the frequency of the antenna units 160, 360, and 460 according to an embodiment of the disclosure. Among them, the ordinate unit of FIG. 5A is VSWR, and the abscissa unit is frequency (MHz). Curves 510A, 520A, and 530A in Figure 5A are in order Respective curves of antenna voltage standing wave ratios versus frequencies of the antenna units 160, 360, and 460, respectively. It can be seen from FIG. 5A that the VSWRs of the antenna units 160, 360, and 460 at, for example, Wi-Fi 2.4GHz and Wi-Fi 5GHz approach 1, showing good impedance matching.

Next, FIG. 5B is a diagram showing the relationship between the antenna efficiency and the frequency of the antenna units 160, 360, and 460 according to an embodiment of the disclosure. Specifically, FIG. 5A shows the relationship between antenna efficiency and frequency when the antenna units 160, 360, and 460 are placed adjacent to electronic components such as speakers, and the electronic components are digs placed in the antenna units 360 and 460. In slot T1. In Fig. 5A, the ordinate unit is antenna efficiency (dB), and the abscissa unit is frequency (MHz). The curves 510B, 520B, and 530B in FIG. 5B are the relationship curves of the antenna efficiency versus frequency of the antenna units 160, 360, and 460, respectively. It can be understood from FIG. 5B that the antenna units 360 and 460 are copper-coated inside or outside the respective trench T1, and their antenna efficiency is better than that without the trench T1 and copper-plated (the sixth metal part M6 or the seventh metal part M7 The antenna unit 160 increases the antenna efficiency to approximately -4dB to -5.5dB.

FIG. 6A is a diagram showing a relationship between isolation and frequency of two antenna units 360 in the electronic device 100 according to an embodiment of the disclosure. In this example, the distance between the two positions 150 of the electronic device 100 is about 60 mm, that is, the two antenna units 360 are about 60 mm apart from each other. In FIG. 6A, the ordinate unit is isolation (dB), and the abscissa unit is frequency (MHz). A curve 610 shows the isolation between the antenna units 360 on both sides. As can be seen from the figure, the isolation of the antenna units 360 on both sides is lower than -10dB at low or high frequencies, and has good isolation.

FIG. 6B illustrates the relationship between antenna efficiency and frequency of the antenna units 360 on both sides of the electronic device 100 according to an embodiment of the disclosure. The ordinate unit of FIG. 6B is the antenna efficiency (dB) and the abscissa unit is the frequency (MHz). The curves 610B and 620B represent the antenna efficiency plots of the left antenna unit 360 and the right antenna unit 360, respectively. In the case where the antenna unit 360 of the present disclosure is actually applied to the electronic device 100, the antenna efficiency of the two antenna units 360 at, for example, Wi-Fi 2.4 GHz is -4 dB to -5.5 dB, and the antenna efficiency at, for example, Wi-Fi 5 GHz It is -4dB ~ -7.5dB.

As mentioned above, when the electronic device 100 is provided with two antenna units, the first metal part M1 of each antenna unit faces the edge 144 of the fuselage and is arranged in a mirror-symmetrical manner, as shown in FIG. 7 A schematic cross-sectional view of the electronic device 100 according to an embodiment of the document is disclosed. Specifically, FIG. 7 shows a cross section of the electronic device 100 of FIG. 1A in the direction of the section line B-B '. The embodiment is described by taking the antenna unit 460 as an example. It can be seen from the figure that the first metal parts M1 of the two antenna units 460 are facing in the same direction (facing the edge of the fuselage 144), and the two antenna units 460 are mirrored left and right in the electronic device 100 with the center line L2 as the center. symmetry.

According to the above, the electronic device and its antenna unit disclosed in this disclosure implement the technology that can still maintain good antenna performance under the all-metal casing structure, and the integrated arrangement of the antenna unit and some components of the electronic device can reduce the The occupation of the internal space of the electronic device makes the use of the internal space of the electronic device more flexible, and the appearance volume of the electronic device can be further reduced.

Although the embodiment of the present invention has been disclosed as above, it is not intended to Limiting the present invention, anyone skilled in the art can make some changes and retouching without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be defined by the scope of the attached patents.

Claims (14)

An electronic device includes: a main body having a containing space, the main body being electrically connected to a system ground plane for grounding; an antenna unit disposed in the containing space, the antenna unit including: a dielectric member, Including a first surface, a second surface, a third surface, and a fourth surface, wherein the first surface is vertically adjacent to the second surface and the third surface, and the fourth surface is vertically adjacent to the second surface And the third surface, the second surface and the third surface are located on opposite sides, and the fourth surface and the first surface are located on opposite sides to form a resonant cavity; a first metal portion, provided The first surface is provided with a first slot and a feeding end for receiving a signal, the first metal part is a loop shape, and the first slot is located on the first metal A second metal portion provided on the second surface, a second slot between the second metal portion and the first metal portion; and a third metal portion provided on the third surface And is connected to a portion of the first metal portion, and a third slot is provided between the third metal portion and the first metal portion; A fourth metal portion is disposed on the fourth surface and is connected to the second metal portion and the third metal portion; wherein the second metal portion and the third metal portion are respectively in electrical contact with the main body to be grounded, The signal is fed to the first metal part, the second metal part, and the third metal part through the feeding end and resonates with the resonant cavity to generate a first antenna resonance frequency band and a second antenna resonance. Frequency band. The electronic device according to claim 1, wherein the dielectric member further includes a fifth surface, the fourth surface is vertically adjacent to the fifth surface, and the fifth surface is vertically adjacent to the first surface and the second surface. , The third surface and the fourth surface, wherein the fourth metal portion and the first metal portion, the second metal portion and the third metal portion surround a fourth slot, and the antenna unit further includes: A fifth metal portion is disposed on the fifth surface and is connected to the second metal portion, the third metal portion, and the fourth metal portion, wherein the fifth metal portion is connected to the first metal portion and the first metal portion. A fifth slot is surrounded by the two metal portions and the third metal portion. The electronic device according to claim 2, wherein the sizes of the second slot, the third slot, the fourth slot, and the fifth slot are related to the frequency of the first antenna resonance frequency band. The size of a slot is related to the frequency of the resonance frequency band of the second antenna. The electronic device according to claim 2, wherein the dielectric member further includes a sixth surface, and the sixth surface is vertically adjacent to the first surface, the second surface, the third surface, and the fourth surface. The sixth face and the fifth face are located on opposite sides, the second slot is located on the first face, the fourth slot is located on the first face and the sixth face, and the fifth slot is located The first side and the fifth side. The electronic device according to claim 2, wherein the dielectric member has a first half and a second half, the first metal portion, the second metal portion, the third metal portion, and the fourth metal And the fifth metal part are attached to the surface of the second half, and the first half has a cutout for mounting an electronic component. The electronic device according to claim 5, wherein the antenna unit further includes: a sixth metal portion disposed inside the trench, and electrically connected to the third metal portion and the fourth metal portion. The electronic device according to claim 5, wherein the dielectric member further includes a sixth surface, and the sixth surface is vertically adjacent to the first surface, the second surface, the third surface, and the fourth surface. The sixth surface and the fifth surface are located on opposite sides, and the antenna unit further includes: a seventh metal portion disposed on the first surface and the sixth surface and located on the first half portion, and is opposite to the first surface portion. The three metal parts and the fourth metal part are electrically connected. An antenna unit includes: a dielectric member including a first face, a second face, a third face, and a fourth face, wherein the first face is vertically adjacent to the second face and the third face, The fourth surface is vertically adjacent to the second surface and the third surface, and the second surface and the third surface are located on opposite sides, and the fourth surface and the first surface are located on opposite sides to form A resonance cavity; a first metal part disposed on the first surface, and having a first slot and a feeding end, the feeding end is used for receiving a signal, and the first metal part is a loop Shape, and the first slot is located inside the first metal portion; a second metal portion is disposed on the second surface and is grounded, and has a second slot between the first metal portion and the first metal portion; and A third metal portion is disposed on the third surface and is grounded, and is connected to the first metal portion. There is a third slot between the third metal portion and the first metal portion; a fourth metal portion Is disposed on the fourth surface and is connected to the second metal portion and the third metal portion; wherein the signal is fed to the first metal portion through the feeding end. Metal portion, the metal portion and the second portion and the third metal cavity resonator and the resonator resonant frequency to generate a first antenna and a second antenna resonance frequency. The antenna unit according to claim 8, wherein the dielectric member further includes a fifth surface, the fourth surface is vertically adjacent to the fifth surface, and the fifth surface is vertically adjacent to the first surface and the second surface. , The third surface and the fourth surface, wherein the fourth metal portion and the first metal portion, the second metal portion and the third metal portion surround a fourth slot, and the antenna unit further includes: A fifth metal portion is disposed on the fifth surface and is connected to the second metal portion, the third metal portion, and the fourth metal portion, wherein the fifth metal portion is connected to the first metal portion and the first metal portion. A fifth slot is surrounded by the two metal portions and the third metal portion. The antenna unit according to claim 9, wherein the sizes of the second slot, the third slot, the fourth slot and the fifth slot are related to the frequency of the first antenna resonance frequency band. The size of a slot is related to the frequency of the resonance frequency band of the second antenna. The antenna unit according to claim 9, wherein the dielectric member further includes a sixth surface, and the sixth surface is vertically adjacent to the first surface, the second surface, the third surface, and the fourth surface. The sixth face and the fifth face are located on opposite sides, the second slot is located on the first face, the fourth slot is located on the first face and the sixth face, and the fifth slot is located The first side and the fifth side. The antenna unit according to claim 9, wherein the dielectric member has a first half and a second half, the first metal portion, the second metal portion, the third metal portion, and the fourth metal And the fifth metal part are attached to the surface of the second half, and the first half has a cutout for mounting an electronic component. The antenna unit according to claim 12, further comprising: a sixth metal portion disposed inside the trench and electrically connected to the third metal portion and the fourth metal portion. The antenna unit according to claim 12, wherein the dielectric member further includes a sixth surface, and the sixth surface is vertically adjacent to the first surface, the second surface, the third surface, and the fourth surface. The sixth surface and the fifth surface are located on opposite sides, and the antenna unit further includes: a seventh metal portion disposed on the first surface and the sixth surface and located on the first half portion, and is opposite to the first surface portion. The three metal parts and the fourth metal part are electrically connected.