TWI492455B - Antenna and electronic apparatus having the same - Google Patents

Description

Antenna and electronic device therewith

The present invention relates to an antenna structure, and more particularly to a dual band antenna and an electronic device therewith.

With the rapid development of mobile communications and wireless networks, wireless communications applications are becoming more widespread, and the demand for dual-band or multi-frequency antennas is increasing. Conventional multi-frequency antennas typically utilize slots to excite another resonant mode to produce multiple operating bands, making them suitable for use in different agreed application bands, such as Bluetooth, 802.11 a/b/g application bands. It is only such an antenna structure that has a problem of large volume and space.

Most of the stand-alone antenna designs use a planar inverted-F antenna structure. Most of these antennas are used in notebook computers and handheld devices, and small coaxial lines are used to feed signals to the antenna. In general, there is only one way in which a signal is fed into an antenna, and the coaxial line must be connected to the antenna via a specific feed end in accordance with the structure of the antenna. The feeding direction of the antenna cannot be adjusted at any time according to the system requirements, so the traditional antenna cannot meet the design requirements of the left and right feeding. When the feed end of the antenna needs to be placed at the other end of the antenna, another set of antenna structures of the same size but structurally mirrored is required. Structured mirrored antennas require another different set of antenna molds to be fabricated, which greatly increases the cost of antenna fabrication.

In addition, the conventional independent antenna design has a poor ability to resist adjacent metal interference, and it is easy to affect the impedance matching and radiation efficiency of the antenna radiator due to the proximity of the metal to the antenna.

The present invention provides a dual band antenna and an electronic device therewith. The antenna has two feeding directions, which is quite convenient during installation, and has a shielding wall, which can reduce the influence of the adjacent metal objects on the antenna matching and radiation pattern.

The invention provides an antenna comprising a grounding portion, a main radiating portion and a shielding wall. The main radiating portion is connected to a first side of the grounding portion, the main radiating portion has a first radiating portion and a second radiating portion that are structurally symmetric, wherein the first radiating portion has a first feeding end, the first radiating portion The second radiating portion has a second feeding end. The shielding wall is connected to a second side of the grounding portion and opposite to the main radiating portion.

The first radiating portion includes a first radiating arm and a second radiating arm, and the second radiating portion includes a third radiating arm and a fourth radiating arm, wherein the first radiating arm and the second radiating arm Intersectably, the third radiating arm is disposed to intersect with the fourth radiating arm, wherein the second radiating arm and the fourth radiating arm respectively extend from the middle portion of the main radiating portion toward both sides to form a T-shaped structure. The first radiating arm and the third radiating arm respectively extend from the two sides of the main radiating portion toward the middle portion of the main radiating portion to form two mutually inverted inverted L-shaped structures, and the T-shaped structure is located Among the areas surrounded by the two inverted L structures.

The invention further provides an antenna comprising a grounding portion, a main radiating portion and a shielding wall. The main radiating portion is connected to a first side of the grounding portion; the shielding wall is connected to a second side of the grounding portion and opposite to the main radiating portion.

The above antenna can be applied to an electronic device such as a host computer of a desktop computer, a multimedia player, a networked television, a network television box, or a DVD player.

In summary, the antenna proposed by the present invention has two feeding ends in different directions, and the wiring manner of the two coaxial lines can be selected. The grounding portion of the antenna can be attached to the machine member by means of a backing, and the shielding wall has the problem of reducing the influence of the adjacent metal on the matching and the radiation field. In addition, the structure of the antenna can be formed by stamping and bending a single piece of metal sheet, which is inexpensive to manufacture and easy to implement. Therefore, the antenna of the present invention is applied to a wirelessly connectable electronic device, which can increase the convenience of assembly and reduce the cost.

The above described features and advantages of the present invention will be more apparent from the following description.

DETAILED DESCRIPTION OF THE INVENTION The detailed description of the embodiments of the invention is set forth in the claims

(First Embodiment)

FIG. 1 is a schematic structural view of an antenna according to a first embodiment of the present invention. The antenna 100 includes a ground portion 11, a main radiating portion 12, and a shield wall 13. The grounding portion 11 has a first side 112 and a second side 114. The main radiating portion 12 and the shield wall 13 are respectively connected to the first side 112 and the second side 114 of the ground portion 11, and are opposed to each other and extend substantially in the same direction. The components such as the grounding portion 11, the main radiating portion 12, and the shielding wall 13 may be conductors of any shape (the conductor may be metal), for example, may be a flat plate shape or a sheet-shaped conductor, and the conductors may constitute an antenna through the aforementioned connection manner. 100.

Please refer to FIG. 1 and FIG. 2 simultaneously. FIG. 2 is a schematic diagram showing the unfolded structure of the antenna according to the first embodiment of the present invention. As can be seen from FIG. 1 and FIG. 2, the antenna 100 can also be formed by a single sheet-shaped conductor. For example, after forming the main radiating portion 12 by a single metal sheet, the U-shaped structure can be formed by bending twice, wherein the grounding portion 11 is U-shaped. The bottom plane of the structure, and the shield wall 13 and the main radiating portion 12 form substantially parallel two side walls which are opposite each other and which extend substantially the same direction.

The shielding wall 13 can be used to reduce the impedance matching and radiation efficiency of the metal object behind it to the main radiating portion 12. Therefore, the antenna 100 can be directly disposed in front of a metal object such as a top metal frame of a liquid crystal display. In the present embodiment, the height of the shielding wall 13 is preferably greater than or equal to the height of the main radiating portion 12, but the embodiment is not limited. In theory, the larger the area of the shield wall 13, the better the shielding effect on the main radiating portion 12.

The main radiating portion 12 has a first radiating portion 141 and a second radiating portion 142 which are structurally symmetrical, wherein the first radiating portion 141 has a first feeding end 151 and the second radiating portion 142 has a second feeding end 152. The antenna signal can be fed via the first feed end 151 or/and the second feed end 152. The antenna 100 can feed signals using a mini-cable. Since the first feeding end 151 and the second feeding end 152 are opposite in direction and are respectively located on both sides of the antenna 100, the small coaxial line can be utilized. Different wiring methods are connected to the antenna 100.

Please refer to FIG. 3 and FIG. 4 , which are schematic diagrams showing the connection of a small coaxial line to an antenna. The cupper wire of the small coaxial line 310 can be connected to the first feed end 151, and the outer layer of the cupper mesh is grounded to the ground portion 11, as shown in FIG. The conductive copper wire of the small coaxial line 310 can also be connected to the second feed end 152, and the outer mesh conductor layer is grounded to the ground portion 11, as shown in FIG. Alternatively, the antenna 100 can also feed signals from the first feed end 151 and the second feed end 152 at the same time. This embodiment does not limit the feeding mode of the antenna 100. It should be noted that the mesh conductor layer of the small coaxial line 310 can be grounded to the grounding portion 11 via different positions, for example, the short-circuiting end 121b of the first radiating arm 121 or the short-circuiting end 123b of the third radiating arm 123. This embodiment does not Restricted.

Referring to FIG. 1, the main radiating portion 12 has four radiating arms 121-124, wherein the first radiating arm 121 is disposed to intersect with the second radiating arm 122, and the third radiating arm 123 is disposed to intersect with the fourth radiating arm 124. The second radiating arm 122 and the fourth radiating arm 124 are respectively extended from the intermediate portion of the main radiating portion 12 in both side directions to form a T-shaped structure 120. The first radiating arm 121 and the third radiating arm 123 are respectively extended from the both sides of the main radiating portion 12 toward the intermediate portion of the main radiating portion 12 to form two mutually inverted inverted L-shaped structures 161, 162. The T-shaped structure 120 is located in a region surrounded by the two inverted L-shaped structures.

Referring to FIG. 2, it should be noted that, in this embodiment, the gap width between the adjacent radiating arms 121 and 122 and between 123 and 124 may be L, and L is preferably less than or equal to 2 mm. . The gap between the first feed end 151 and the inverted L-shaped structure 161 is preferably less than or equal to 2 mm, and the gap between the second feed end 152 and the inverted L-shaped structure 162 is preferably less than or equal to 2 mm. However, the embodiment is not limited.

The gap between the first radiating arm 121 and the second radiating arm 122 forms a first slot 201, and the first slot 201 extends below the second radiating arm 122. The gap between the third radiating arm 123 and the fourth radiating arm 124 forms a second slot 202, and the second slot 202 extends below the fourth radiating arm 124. In this embodiment, the first slot 201 is symmetrical with the second slot 202 and has substantially the same slot width, and the width thereof is preferably less than or equal to 2 mm, that is, L, but the embodiment is not limited. herein.

The neck of the T-shaped structure 120 is connected to the grounding portion 11, the short-circuiting end 122b of the second radiating arm 122 is connected to the neck of the T-shaped structure 120, and the open end 122a of the second radiating arm 122 is short-circuited to the first radiating arm 121. The end of the end 121b extends and forms a first feed end 151; the short end 124b of the fourth radiating arm 124 is connected to the neck of the T-shaped structure 120, and the open end 124a of the fourth radiating arm 124 is directed to the third radiating arm 123 The direction of the short-circuited end 123b extends and forms a second feed-in end 152.

Centered on the broken line 160, the antenna 100 can be divided into two symmetrical radiating portions, that is, a first radiating portion 141 and a second radiating portion 142. In terms of structure, the first radiating portion 141 and the second radiating portion 142 are respectively formed by two inverted L-shaped structures arranged in a cross. On the other hand, the T-shaped structure 120 can also be regarded as a combination of two inverted L-shaped structures, and those skilled in the art should be inferred from FIG. 1 and will not be described herein.

The antenna 100 of this embodiment has a plurality of resonant modes, and can provide a plurality of operating frequency bands. Referring to FIG. 5, a frequency response diagram of the antenna 100 of the present embodiment is illustrated. The measurement and simulation curves are included in Figure 5. It can be seen from Figure 5 that the antenna 100 has multiple frequency bands, the 2.4 GHz band, the 5.2 GHz band and the 5.8 GHz band. The return loss of these three bands can reach below 10 dB, and the return loss of the 5.2 GHz band and the 5.8 GHz band can reach below 14 dB. It is worth noting that the 5.2 GHz band of the antenna 100 of the present embodiment further includes the 5 GHz band (4.9 to 5 GHz) in Japan.

It should be noted that the antenna 100 of the present embodiment can also be implemented by means of a flat structure (ie, without a bent structure), which has two operating bands with a return loss of 10 dB or more (2.4 GHz, 5975 MHz and 7510 MHz), as shown in FIG. 6, show the frequency response diagram of the antenna 100 and the antenna of the flat structure. As can be seen from Figure 6, the flat-frame antenna has better return loss (greater than 25 dB) in the 2.4 GHz band.

The antenna 100 has a plurality of different surface current paths to generate resonance modes of a plurality of different frequency bands. Referring to FIG. 7A to FIG. 7C, a schematic diagram of surface current distribution of the antenna in the three frequency bands of the present embodiment is shown. In Figure 7A, the signal source is located between terminals A and B, i.e., the signal is fed by the first feed terminal 151. Figure 7A shows the surface current path and direction at a frequency of 2450 MHz; Figure 7B shows the direction of the surface current path at 5975 MHz; Figure 7C shows the surface current path and direction at a frequency of 7510 MHz. As is apparent from FIG. 7A, the current path at 2450 MHz is mainly around the first radiating arm 121 and the second radiating arm 122, as shown by region 710. This surface current path can be used as a half-wavelength loop mode to excite the resonant mode of the 2450 MHz band. This surface current path also contributes to the resonant frequency band of 7510 MHz.

As is apparent from FIG. 7B, the current path exciting the 5975 MHz band mainly surrounds the second radiating arm 122 and its lower region, with reference numerals 721 and 722 indicating the current null position as indicated by region 720. This surface current path can be used as a one-wavelength loop mode, mainly to excite the resonant mode of the 5975 MHz band. As is apparent from Fig. 7C, the current path exciting the 7510 MHz band mainly surrounds the first radiating arm 121 and the second radiating arm 122, wherein the reference numerals 731, 732 indicate the current null position. As can be seen from FIG. 7C, the current zero point is located intermediate the first radiating arm 121 and the second radiating arm 122, as indicated by region 730. This surface current path can be used as a full-wave loop mode, mainly to excite the resonant mode of the 7510 MHz band.

It can also be seen from FIGS. 7A-7C that the current path of the lowest resonance mode is via endpoint A to endpoint C and by endpoint D via endpoints E, F to endpoint B. The current path of the higher resonant mode is bilaterally symmetric, as shown in Figures 7A-7C. The difference in the above resonant modes is mainly due to the different current paths.

In addition, it can also be seen from FIGS. 7A to 7C that the frequency band of the antenna 100 can be determined by the preset distance d between the end points E and F and the neck width w of the T-shaped structure 120. Please refer to FIG. 8 , which illustrates a preset distance d and a corresponding frequency response diagram. In this embodiment, the width of the grounding portion 11, the main radiating portion 12, and the shielding wall 13 is 10 mm, and the length is, for example, 70 mm. However, the present embodiment does not limit the grounding portion 11, the main radiating portion 12, and The size of the shield wall 13. 8 is an example in which the preset distance d is 4 mm, 8 mm, and 12 mm. The predetermined distance d is the distance between the open end 121a of the first radiating arm 121 and the open end 123a of the third radiating arm 123. The preset distance d mainly affects the current path in the 2.4 GHz band. The larger the preset distance d is, the smaller the half-loop path is, so the resonant frequency band of 2.4 GHz will increase. Please refer to FIG. 9 , which illustrates the neck width w of the T-shaped structure 120 and a corresponding frequency response diagram. In this embodiment, the width w is 8mm, 12mm, and 16mm as an example. The neck width w of the T-shaped structure 120 mainly affects the high-frequency resonance frequency band of 5 GHz, and the larger the neck width w, the relative resonance The higher the frequency band.

10 to 12 illustrate the far-field radiation patterns of the antenna 100 of the present embodiment at operating frequencies of 2442 MHz, 5250 MHz, and 5775 MHz, respectively. As can be seen from Figures 10 to 12, the antenna 100 has a good omni-direction in the x-z plane. When the antenna 100 is disposed on a metal frame of an electronic device such as a liquid crystal television, the x-z plane corresponds to the vertical plane of the antenna 100, and a better omnidirectional reception effect can be obtained. It is particularly noted that due to the shielding wall 13, the antenna 100 has the greatest radiation intensity in the z direction.

FIG. 13 illustrates the peak gain and radiation efficiency of the antenna 100 of the present embodiment. The peak gain in the 2.4 GHz band is approximately 2.9 dBi and the radiation efficiency is greater than 84%; in both the 5.2 GHz and 5.8 GHz bands, the peak gain is from 4.1 dBi to 5.3 dBi and the radiation efficiency is greater than 86%. The measurement environment of the above radiation efficiency can input a signal of input power of 0 dBm to the antenna 100 in the test laboratory, and then measure the total amount of radiation emitted by the antenna 100. The ratio of total radiation to 0 dBm is the radiation efficiency. The details of the above measurement and simulation, which are generally known in the art, should be inferred from the description of the above embodiments, and are not described herein.

When the antenna 100 is disposed, the grounding portion 11 of the antenna 100 can be adhered to the top of the casing of the liquid crystal television by the adhesive, and the shielding wall 13 can face the back frame metal of the liquid crystal television. The shielding wall 13 has the effect of reducing the matching and radiation pattern of the back frame metal affecting the antenna 100, so that a better radiation effect can be obtained. Please refer to FIG. 14 , which illustrates a schematic diagram of the use of the antenna 100 . The antenna 100 can be mounted on the top of the screen 43 of the LCD television and backed against the rear metal frame 41. Since the signals can be fed on both sides of the antenna 100, it is quite convenient in the line configuration.

(Second embodiment)

The antenna 100 of the first embodiment described above has a symmetrical first radiating portion 141 and a second radiating portion 142. In the second embodiment of the present invention, the antenna may have only a single radiating portion. Referring to FIG. 15, a schematic structural diagram of an antenna according to a second embodiment of the present invention is shown. The structure of the antenna 100 in FIG. 1 can be divided into two antennas centered on the broken line 160, and the left half is the antenna 200. The antenna 200 has only the first radiating portion 241. The antenna 200 has a grounding portion 21, a main radiating portion 22 and a shielding wall 23. The grounding portion 21 has a first side 212 and a second side 214, wherein the main radiating portion 22 and the shielding wall 23 are respectively connected to the first portion of the ground portion 21. The side 212 and the second side 214 are opposite each other and extend generally in the same direction. The main radiating portion 22 has only the first radiating arm 221 and the second radiating arm 222. The detailed structure of the antenna 200 can be inferred from the description of the antenna 100 described above, and will not be described herein.

Please refer to FIG. 16 , which illustrates a comparison of the frequency response of the antenna 100 and the antenna 200 . In the low frequency band, the return loss of the antenna 200 is poor, and in the 5 GHz band, the antenna 200 also has a return loss of more than 10 dB, which is also applicable to the 5 GHz band. As can be seen from the above, the half structure of the antenna 100 of the present invention can also be used as an antenna, but is more suitable for the 5 GHz band. In use, the user can use the antenna 100 or the antenna 200 according to design requirements, and the invention is not limited.

(Third embodiment)

The antennas 100 and 200 of the present invention can be applied to various electronic devices, such as a multimedia player, a networked television, a network television box, a host of a desktop computer, or a DVD (Digital Versatile Disc or Digital Video Disc) player. In the networked device, this embodiment does not limit the type of the electronic device. Referring to FIG. 17A and FIG. 17B, a schematic diagram of an electronic device according to a third embodiment of the present invention is shown. In FIG. 17A, the electronic device 901 includes a host 910 and an antenna 100. The host 910 can be connected to the antenna 100 via a feed end of the antenna 100 (such as the first feed end 151 or the second feed end 152 shown in FIG. 1). And connected to the network via the antenna 100 for data transmission. The electronic device 901 is, for example, a host of a multimedia player, a network television box, a DVD player, or a desktop computer. In FIG. 17B, the electronic device 902 takes a networked television as an example, and the antenna 100 is disposed in the host 920 for wireless transmission and reception of data.

It is to be noted that the antenna 100 in FIGS. 17A and 17B can also be replaced with the antenna 200 in FIG. The description of the above embodiments is made by those skilled in the art, and the embodiments thereof should be easily inferred, and will not be described herein.

In summary, the present invention utilizes a symmetrical radiating portion structure and a shielding wall to obtain a multi-band antenna, and the shielding wall has the effect of reducing the interference of the rear metal body, and the antenna can obtain better radiation field type and matching characteristics. The antenna of the present invention has a band gain of 2.9 dBi and 4.7 dBi at 2.4 GHz and 5 GHz, and has a radiation efficiency of 84% and 89%, respectively, and is one of the built-in antenna solutions for electronic devices.

Although the preferred embodiments of the present invention have been disclosed as above, the present invention is not limited to the above-described embodiments, and any one of ordinary skill in the art can make some modifications without departing from the scope of the present invention. The scope of protection of the present invention should be determined by the scope of the appended claims.

100. . . antenna

11, 21. . . Grounding

112, 212. . . First side

114,214. . . Second side

12. . . Main radiation department

120. . . T-shaped structure

121, 221. . . First radiation arm

122, 222. . . Second radiation arm

123. . . Third radiation arm

124. . . Fourth radiation arm

121a~124a. . . Open end

121b~124b. . . Short circuit end

13. . . Shield wall

141, 241. . . First radiation department

142. . . Second radiation department

151. . . First feed end

152. . . Second feed end

160. . . dotted line

161, 162. . . Inverted L structure

200. . . antenna

201. . . First slot

202. . . Second slot

twenty one. . . Grounding

twenty two. . . Main radiation department

twenty three. . . Shield wall

310. . . Small coaxial cable

41. . . Metal frame

43. . . Screen

720, 730. . . region

721, 722. . . Label

731, 732. . . Label

901, 902. . . Electronic device

910, 920. . . Host

A~F. . . End point

d. . . Preset distance

w. . . Neck width

L. . . gap

FIG. 1 is a schematic structural view of an antenna according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing the unfolded structure of the antenna according to the first embodiment of the present invention.

3 is a schematic diagram showing the connection of a small coaxial line to an antenna.

4 is a schematic diagram showing the connection of a small coaxial line to an antenna.

FIG. 5 is a diagram showing the frequency response of the antenna 100 of the present embodiment.

FIG. 6 is a diagram showing the frequency response of the antenna 100 and the antenna of the flat structure.

7A-7C are schematic diagrams showing surface current distribution of the antenna of the embodiment in three frequency bands.

FIG. 8 illustrates a preset distance d and a corresponding frequency response diagram.

FIG. 9 illustrates a neck width w of the T-shaped structure 120 and a corresponding frequency response diagram.

10 to FIG. 12 respectively illustrate far-field radiation patterns of the antenna 100 according to the first embodiment of the present invention at operating frequencies of 2442 MHz, 5250 MHz, and 5775 MHz.

Figure 13 is a diagram showing the peak gain and radiation efficiency of the antenna 100 of the first embodiment of the present invention.

FIG. 14 is a schematic diagram showing the use of the antenna 100.

FIG. 15 is a schematic structural diagram of an antenna according to a second embodiment of the present invention.

FIG. 16 is a diagram showing a comparison of the frequency response of the antenna 100 and the antenna 200.

17A and 17B are schematic views of an electronic device according to a third embodiment of the present invention.

100. . . antenna

11. . . Grounding

112. . . First side

114. . . Second side

12. . . Main radiation department

120. . . T-shaped structure

121. . . First radiation arm

122. . . Second radiation arm

123. . . Third radiation arm

124. . . Fourth radiation arm

121a~124a. . . Open end

121b~124b. . . Short circuit end

13. . . Shield wall

141. . . First radiation department

142. . . Second radiation department

151. . . First feed end

152. . . Second feed end

160. . . dotted line

161, 162. . . Inverted L-shaped structure

d. . . Preset distance

w. . . Neck width

Claims (20)

An antenna includes: a grounding portion having a first side and a second side; a main radiating portion connected to the first side of the grounding portion, the main radiating portion having a first radiating portion having a structural symmetry and a second radiating portion, wherein the first radiating portion has a first feeding end, the second radiating portion has a second feeding end; and a shielding wall is connected to the second side of the ground portion and The main radiation portion is opposite. The antenna of claim 1, wherein the first radiating portion comprises a first radiating arm and a second radiating arm, and the second radiating portion comprises a third radiating arm and a fourth radiating arm, wherein The first radiating arm is disposed to intersect with the second radiating arm, and the third radiating arm is disposed to intersect with the fourth radiating arm, wherein the second radiating arm and the fourth radiating arm are respectively respectively moved from a middle portion of the main radiating portion Extending in both directions to form a T-shaped structure, and the first radiating arm and the third radiating arm respectively extend from two sides of the main radiating portion toward a middle portion of the main radiating portion to form two substantially mutually mutual A symmetrical inverted L-shaped structure, the T-shaped structure is located in a region surrounded by the two inverted L-shaped structures. The antenna of claim 2, wherein the T-shaped structure includes a neck portion connected to the ground portion, the second radiating arm includes a second short-circuit end and a second open end, The first radiating arm includes a first shorting end connected to the neck of the T-shaped structure, and the second open end extends in a direction of the first shorting end of the first radiating arm and forms the a first feeding end; the fourth radiating arm includes a fourth shorting end and a fourth open end, the third radiating arm includes a third shorting end, and the fourth shorting end is connected to the neck of the T-shaped structure And the fourth open end extends toward the third short end of the third radiating arm and forms the second feed end. The antenna of claim 2, wherein the first radiating arm comprises a first open end, and the third radiating arm comprises a third open end, between the first open end and the third open end A predetermined distance apart, wherein the operating frequency band of the antenna is related to the predetermined distance from the width of the neck of the T-shaped structure. The antenna of claim 2, wherein a first slot is formed between the first radiating arm and the second radiating arm, and a third slot is formed between the third radiating arm and the fourth radiating arm. a second slot, wherein the first slot is symmetrical with the second slot and has substantially the same slot width. The antenna of claim 1, wherein the height of the shielding wall is greater than or equal to the height of the main radiating portion. The antenna according to claim 1, wherein the grounding portion, the main radiating portion and the shielding wall are stamped and formed from a single metal sheet. An antenna includes: a grounding portion having a first side and a second side; a main radiating portion connected to the first side of the grounding portion, the main radiating portion including a first radiating arm and a crossover a second radiating arm disposed between the first radiating arm and the grounding portion; and a shielding wall connected to the second side of the grounding portion and opposite to the main radiating portion. The antenna of claim 8, wherein the first radiating arm has a first shorting end and a first open end, and the second radiating arm has a second shorting end and a second open end, The first short circuit end is connected to the ground portion, the first open end extends in a direction of the second short end of the second radiating arm; the second short end of the second radiating arm is connected to the ground portion, and the first The two open ends extend in a direction to the first short end of the first radiating arm to form a feed end. The antenna of claim 8, wherein the height of the shielding wall is greater than or equal to the height of the main radiating portion. The antenna of claim 8, wherein the grounding portion, the main radiating portion and the shielding wall are stamped and formed from a single metal sheet. An electronic device includes: a host; and an antenna disposed in the host, the antenna includes: a ground portion having a first side and a second side; a main radiating portion connected to the ground portion The first radiating portion has a first radiating portion and a second radiating portion, wherein the first radiating portion has a first feeding end, and the second radiating portion has a second feeding end. And a shielding wall connected to the second side of the grounding portion and opposite to the main radiating portion; wherein the host is connected to the antenna via the first feeding end or the second feeding end, and The antenna is connected to the network for data transmission. The electronic device of claim 12, wherein the first radiating portion comprises a first radiating arm and a second radiating arm, and the second radiating portion comprises a third radiating arm and a fourth radiating arm. Wherein the first radiating arm is disposed to intersect with the second radiating arm, and the third radiating arm is disposed to intersect with the fourth radiating arm, wherein the second radiating arm and the fourth radiating arm are respectively separated by an intermediate portion of the main radiating portion Extending in both directions to form a T-shaped structure, and the first radiating arm and the third radiating arm respectively extend from two sides of the main radiating portion toward a middle portion of the main radiating portion to form two substantially A mutually symmetrical inverted L-shaped structure, the T-shaped structure being located in a region surrounded by the two inverted L-shaped structures. The electronic device of claim 13, wherein the T-shaped structure comprises a neck, the neck is connected to the grounding portion, and the second radiating arm comprises a second shorting end and a second open end. The first radiating arm includes a first shorting end connected to the neck of the T-shaped structure, and the second open end extends toward the first shorting end of the first radiating arm and forms The first feeding end; the fourth radiating arm includes a fourth shorting end and a fourth open end, the third radiating arm includes a third shorting end, the fourth shorting end is connected to the T-shaped structure a neck portion, and the fourth open end extends in a direction to the third short end of the third radiating arm and forms the second feed end. The electronic device of claim 13, wherein the first radiating arm comprises a first open end, the third radiating arm comprises a third open end, the first open end and the third open end The distance is a predetermined distance, wherein the operating frequency band of the antenna is related to the preset distance and the width of the neck of the T-shaped structure. The electronic device of claim 13, wherein a first slot is formed between the first radiating arm and the second radiating arm, and a third slot is formed between the third radiating arm and the fourth radiating arm. a second slot, wherein the first slot is symmetrical with the second slot and has substantially the same slot width. The electronic device of claim 12, wherein the height of the shielding wall is greater than or equal to the height of the main radiating portion. The electronic device of claim 12, wherein the grounding portion, the main radiating portion and the shielding wall are stamped and formed from a single metal sheet. The electronic device of claim 12, wherein the electronic device is a multimedia player, a networked television, a network television box, a host of a desktop computer, or a DVD player. An electronic device includes: a host; and an antenna disposed in the host, the antenna includes: a ground portion having a first side and a second side; a main radiating portion connected to the ground portion a first radiating portion includes a first radiating arm and a second radiating arm disposed at an intersection, the second radiating arm is disposed between the first radiating arm and the ground portion, and the second radiating arm has a feed end; and a shield wall connected to the second side of the ground portion and opposite to the main radiating portion; wherein the host is connected to the antenna via the feed end of the main radiating portion, and The antenna is connected to the network for data transmission.