TWI616026B - Electronic device - Google Patents

Abstract

The electronic device includes a first side cover, a second side cover, a conductive blocking wall, and at least one dual-frequency loop feed. The first side cover and the second side cover are combined into a casing. The first side cover has a first conductive surface, and the second side cover has a second conductive surface. The conductive retaining wall is vertically coupled to the first conductive surface and the second conductive surface to form a cavity together. The dual-frequency loop feed is arranged in parallel with the conductive retaining wall and stands between the first conductive surface and the second conductive surface. The dual-frequency loop feed can resonate in the cavity to provide a first-band signal and a second-band signal.

Description

Electronic device

The invention relates to an electronic device, in particular to an electronic device supporting dual-frequency signals.

As users' demands for network communications increase, electronic products often need to support different standards for network transmission protocols, and therefore often require different antenna modules to correspond to different types of network signals. For example, electronic products need to support wireless communications such as third-generation mobile communication technology (3G), Bluetooth, and Wi-Fi. Since the frequency bands of different wireless communications are different, different wireless communications may be required. Antenna to send and receive signals.

However, as users have higher and higher requirements for the portability of electronic products, electronic products are also required to be lightweight and thin, which makes it increasingly difficult for electronic products with increasingly complex functions to provide a lot of space to accommodate them. antenna. Under strict space constraints, the design and setup of the antenna becomes more difficult. For example, when the antenna space of the third-generation mobile communication technology is limited, it may make it difficult for low-frequency signals to resonate and fail to provide a matching bandwidth, resulting in the antenna ’s Voltage Standing Wave Ratio performance And the antenna efficiency (Antenna Efficiency) is low.

An embodiment of the present invention provides an electronic device. The electronic device includes a first side cover, a second side cover, a conductive retaining wall, and at least one dual-frequency loop feed.

The first side cover has a first conductive surface, and the second side cover has a second conductive surface. The second side cover is disposed opposite to the first side cover and can be combined with the first side cover to form a cabinet. The conductive retaining wall is vertically coupled to the first conductive surface and the second conductive surface to form a cavity together. At least one dual-frequency loop feed is arranged in parallel with the conductive retaining wall and stands between the first conductive surface and the second conductive surface. Each dual-frequency loop feed includes a feed terminal, a ground terminal, a first radiation block, a second radiation block, a third radiation block, and a fourth radiation block.

The ground terminal is coupled to the second conductive surface. The first radiation block has a feeding point coupled to the feeding end. One end of the second radiation block is coupled to the first radiation block. The third radiation block is disposed relative to the first radiation block, and is coupled between the other end of the second radiation block and the ground end. The fourth radiation block is disposed relative to the second radiation block, and is coupled between the first radiation block and the third radiation block. The first radiating block, the second radiating block, the third radiating block and the fourth radiating block are surrounded to form a rectangular feed with a slot.

The dual-frequency loop feedstock resonates in the cavity to provide a first-band signal and a second-band signal.

FIG. 1 is a schematic diagram of an electronic device 100 according to an embodiment of the present invention. The electronic device 100 includes a first side cover 110, a second side cover 120, a third side cover 130, a fourth side cover 140, a ground conductive sheet 150, a conductive retaining wall 160, a coaxial transmission line 170, and at least one dual-frequency loop feed 180. And matching circuit 190.

The first side cover 110 has a first conductive surface 112, the second side cover 120 has a second conductive surface 122, and the second side cover 120 can be disposed relative to the first side cover 110, that is, the second side cover 120 and the first The side covers 110 can be combined together to form a casing of an electronic device. The third side cover 130 has a third conductive surface, and the third side cover 130 is connected to the first side cover 110 and / or the second side cover 120. The fourth side cover 140 may be disposed relative to the third side cover 130 and combined with the third side cover 130 to form another casing.

In some embodiments of the present invention, the electronic device 100 can be used by a notebook computer. For example, in FIG. 1, the first side cover 110 can be a metal lower cover of the notebook computer, and the second side cover 120 can be a metal side cover containing a keyboard, and the two can be combined into a base chassis of a notebook computer. In addition, the third side cover 130 may be a metal upper back cover of the notebook computer, and the fourth side cover 140 may be a metal side cover including a screen, and the two may be combined into an upper case of the notebook computer. That is, the conductive surfaces 112 and 122 of the first side cover 110 and the second side cover 120 may be included in the metal lower back cover corresponding to the first side cover 110 and the second side cover 120 and the metal side cover including the keyboard. Metal surface. The third side cover 130 and the fourth side cover 140 may also include conductive surfaces, and the conductive surfaces of the third side cover 130 and the fourth side cover 140 may be metal upper backs corresponding to the third side cover 130 and the fourth side cover 140. The conductive surface of the cover and the metal side cover containing the screen.

However, in some embodiments of the present invention, the first side cover 110, the second side cover 120, the third side cover 130, and the fourth side cover 140 may also be mainly made of a non-conductive material, and a conductive material is additionally provided, such as The conductive cloth serves as a conductive surface of the first side cover 110, the second side cover 120, the third side cover 130, and the fourth side cover 140.

The conductive blocking wall 160 may be vertically coupled to the first conductive surface 112 and the second conductive surface 122 to form a cavity CVT together.

The dual-frequency loop feed 180 is arranged in parallel with the conductive retaining wall 160 and the dual-frequency loop feed 180 stands between the first conductive surface 112 and the second conductive surface 122. The dual-frequency loop feed 180 and the cavity CVT can form resonance to provide a first-band signal and a second-band signal. In other words, the electronic device 100 of the present invention can form a cavity CVT by using a casing and a metal retaining wall, and form a complete antenna structure with the dual-frequency loop feed 180 to increase the resonance area of the antenna, thereby reducing the voltage standing wave ratio ( Voltage Standing Wave Ratio) and Antenna Efficiency.

FIG. 2 is a schematic diagram of a dual-frequency loop feed 180 according to an embodiment of the present invention. The dual-frequency loop feed 180 can resonate with a cavity CVT to provide a dual-frequency signal. In some embodiments of the present invention, the first frequency band signal The frequency range of the signal is 2.4G ~ 2.5G Hz, while the frequency range of the second frequency band signal is 4.9G ~ 5.9G Hz.

The dual-frequency loop feed 180 includes a feed end, a ground end, a first radiation block 181, a second radiation block 182, a third radiation block 183, and a fourth radiation block 184. The ground terminal is coupled to the second conductive surface 122. For example, the circuit board 20 may use a coaxial transmission line 170 including a positive signal end and a negative signal end, wherein the positive signal end is used as a feed-in terminal and the negative signal end is used as a ground terminal. Furthermore, in this embodiment, The grounding terminal further includes a grounding conductive sheet 150. The grounding conductive sheet 150 can be attached to the second conductive surface 122 of the second side cover 120. The feed end of the coaxial transmission line 170 is coupled to the dual-frequency loop feed 180, and the coaxial The ground terminal of the transmission line 170 is coupled to the ground conductive sheet 150 so that the ground terminal of the coaxial transmission line 170 can be coupled to the second conductive surface 122 through the ground conductive sheet 150. In some embodiments of the present invention, the ground conductive sheet 150 may be a copper foil.

The first radiation block 181 has a feeding point FP, and the feeding point FP is coupled to a feeding end of the coaxial transmission line 170. One end of the second radiation block 182 is coupled to the first radiation block 181. The third radiation block 183 is disposed relative to the first radiation block 181 and is coupled between the other end of the second radiation block 182 and the ground conductive sheet 150. The fourth radiation block 184 is disposed relative to the second radiation block 182, and is coupled between the first radiation block 181 and the third radiation block 183. The first radiating block 181, the second radiating block 182, the third radiating block 183, and the fourth radiating block 184 may form a rectangular feed with a slot A.

The dual-frequency loop feed 180 can be connected to the grounded conductive sheet 150 through the radiation blocks 181, 182, and 183 to provide a radiation path, and connected to the grounded conductive sheet 150 through the radiation blocks 181, 184, and 183 to provide another radiation path.

The feeding end of the coaxial transmission line 170 may be coupled to the feeding point FP via the matching circuit 190. The matching circuit 190 can reduce signal bounce, thereby reducing the antenna voltage standing wave ratio of the electronic device 100, and the effect of improving the first frequency band signal with a frequency range of 2.4G to 2.5G Hz is particularly obvious. In more detail, the matching circuit 190 is disposed in the slot A. The matching circuit 190 may include a capacitor 192 and an inductor 194 connected in series with each other. The feeding end of the coaxial transmission line 170 is coupled with the inductor 194, and the inductor 194 is coupled in series The capacitor 192 is coupled to the feeding point FP of the first radiation block 181.

Please refer to FIG. 8 together for a variation chart of the voltage standing wave ratio of the electronic device according to an embodiment of the present invention. In FIG. 8, a curve 810 is a case when the electronic device 100 does not include the matching circuit 190, and a curve 820 is a case when the electronic device 100 includes the matching circuit 190. According to FIG. 8, it can be known that the matching circuit 190 can reduce the voltage standing wave ratio of the electronic device 100, and particularly has a significant improvement effect in a part of the frequency range of 2.4G to 2.5G Hz.

In addition, FIG. 3 is a schematic diagram of a dual-frequency loop feed 280 according to another embodiment of the present invention. The structure of the dual-frequency loop feed 280 is similar to that of the dual-frequency loop feed 180. The dual-frequency loop feed 280 also includes a first radiation block 281, a second radiation block 282, a third radiation block 283, and a fourth radiation region. Block 284. The similarities between the dual-frequency loop feed 280 in FIG. 3 and the dual-frequency loop feed 180 in FIG. 2 are not described again. The differences are described below. The dual-frequency loop feed 280 in FIG. Contains a connecting portion 285. The connecting portion is disposed in the slot A, and the connecting portion 285 is coupled between the first radiating block 281 and the second radiating block 282. The connecting portion 285 separates the slot A into a first sub-slot A1 and A second sub-slot A2, that is, the first radiating block 281, the connection portion 285, the second radiating block 282, the third radiating block 283, and the fourth radiating block 284 surrounds the first sub-slot A1. The second radiating block 281, the connecting portion 285, and the second radiating block 282 form a second sub-slot A2. The method of dividing the slot A into the first sub-slot A1 and the second sub-slot A2 through the connecting portion 285 can further improve the impedance matching of the first frequency band signal and the second frequency band signal. The improvement effect of the second-band signal of G Hz is particularly obvious.

FIG. 9 is a graph of a voltage standing wave ratio versus frequency of an electronic device according to an embodiment of the present invention. In FIG. 9, curve 910 is the voltage standing wave ratio of the electronic device with the matching circuit 190 when the dual-frequency loop feed 180 is used, and curve 920 is the electronic device with the matching circuit 190. Voltage standing wave ratio for dual-frequency loop feed 280. According to FIG. 9, it can be known that when the dual-frequency loop feed 280 is used, that is, the first sub-slot A1 and the second sub-slot A2 are separated in the slot A, the frequency range of the electronic device 100 can be further reduced. The voltage standing wave ratio of 2.4G ~ 2.5G Hertz and the voltage standing wave ratio of 4.9G ~ 5.9G Hertz, especially in the frequency range of 4.9G ~ 5.9G Hertz, have obvious improvement effects.

In addition, the slot A shown in FIG. 2 and the first sub slot A1 and the second sub slot A2 shown in FIG. 3 are schematic diagrams provided for convenience of description. In other embodiments of the present invention, The designer can also adjust the shapes of slot A, first sub slot A1, and second sub slot A2 according to the actual measurement of the system to achieve a better impedance matching effect.

FIG. 4 is a partially enlarged view of the electronic device 100. In FIG. 4, there is a gap g1 between the first radiation block 181 and the first conductive surface 112 of the dual-frequency loop feed 180, and the second radiation block 182 and the second conductive surface of the dual-frequency loop feed 180 There is a gap g2 between 122. In some embodiments of the present invention, if the long side L1 of the dual-frequency loop feed 180 is 40 mm and the wide side W1 is 5 mm, the first radiation block 181 and the first conductive surface of the dual-frequency loop feed 180 The gap g1 between 112 is 0.5mm, and the gap g2 between the second radiation block 182 and the second conductive surface 122 of the dual-frequency loop feed 180 is 0.5mm. Since the gaps g1 and g2 may affect the resonance frequency of the low-frequency antenna, the designer can also adjust the width values of the gaps g1 and g2 according to the actual use situation.

In addition, in FIG. 4, the length of the radiation block of the dual-frequency loop feed 180 in the direction parallel to the arrangement of the third radiation block 183 is greater than the length of the ground conductive sheet 150 coupled to the third radiation block 183. Without changing the side L2 of the dual-frequency loop feed 180, the length of the ground conductive sheet 150 coupled to the third radiation block 183 will affect the frequency range of the low-frequency signal. For example, when the length of the ground conductive sheet 150 coupled to the third radiating block 183 is long, the spectrum range of the first frequency band signal may be biased to 2.5G Hz, and the ground conductive sheet 150 is coupled to the third radiating block 183. When the length is short, the spectrum range of the first frequency band signal may be biased toward 2.3G Hz. Therefore, the designer can adjust the length of the grounding conductive sheet 150 coupled to the third radiation block 183 according to the actual use situation of the electronic device 100 to fit the required spectrum range.

Furthermore, the distance g3 between the feeding point FP of the dual-frequency loop feed 180 and the first conductive surface 112 is smaller than or greater than the distance g4 between the feeding point FP and the second conductive surface 122. In some embodiments of the present invention, the distance g3 between the feeding point FP and the first conductive surface 112 (or the distance g4 between the feeding point FP and the second conductive surface 122) may affect the electronic device 100 to transmit and receive the first Antenna efficiency of a band signal or a second band signal. For example, when the distance g3 between the feed point FP and the first conductive surface 112 is smaller than the distance g4 between the feed point FP and the second conductive surface 122, the transmission and reception of signals in the second frequency band (high-frequency signals) can be improved. Antenna efficiency; in contrast, when the distance g3 between the feed point FP and the first conductive surface 112 is greater than the distance g4 between the feed point FP and the second conductive surface 122, the first frequency band signal (low frequency signal) can be improved. ) Antenna efficiency. In the embodiment of FIG. 4, the electronic device 100 may perform poorly in the high-frequency signal portion. Therefore, it may be preferred to set the feeding point FP in the first radiation block 181 closer to the first conductive surface 112. In order to shorten the distance g3 between the feeding point FP and the first conductive surface 112, the efficiency of transmitting and receiving signals in the second frequency band (high-frequency signals) is improved. However, in other embodiments, the designer can still adjust the distance g3 between the feed point FP and the first conductive surface 112 (or the distance between the feed point FP and the second conductive surface 122) according to the actual use situation. g4) to improve overall antenna efficiency.

The embodiment of FIG. 4 is implemented by the dual-frequency loop feed 180 shown in FIG. 2, but it can also be implemented by using the dual-frequency loop feed 280 shown in FIG. 3, and can be configured according to the foregoing manner.于 电子 装置 100。 In the electronic device 100.

FIG. 5 is a partial cross-sectional view of the cavity CVT of the electronic device 100. In FIG. 5, there is a gap g5 between the dual-frequency loop feed 180 and the conductive retaining wall 160. Since the gap g5 between the dual-frequency loop feed 180 and the conductive retaining wall 160 has a significant effect on the antenna efficiency at high or low frequencies, designers generally need to maintain a large gap to improve antenna efficiency. For example, if the long side L1 of the dual-frequency loop feed 180 is 40 mm and the wide side W1 is 5 mm, the gap g5 between the dual-frequency loop feed 180 and the conductive retaining wall 160 may be greater than 14.5 mm.

In addition, in FIG. 5, the cavity CVT of the electronic device 100 can accommodate the speaker V, the speaker V can be supported by the conductive blocking wall 160, and there is a gap g6 between the dual-frequency loop feed 180 and the speaker V. For example, the length L3 of the speaker V may be 12.5 mm, and the gap g5 between the dual-frequency loop feed 180 and the conductive retaining wall 160 may be 15 mm. The gap between the dual-frequency loop feed 180 and the speaker V may be g6 is about 2.5 mm.

In some embodiments of the present invention, the conductive retaining wall 160 may include a conductive cloth 162, support structures 164, 166, and 168. The support structures 164, 168 may be conductive cushion washers, and the support structure 166 may embed the speaker V therein and apply It can be fixed. In addition, the conductive cloth 162 can be disposed on the outer layer of the support structure 166 and can be coupled to the support structures 164 and 168 to form a conductive portion of the conductive retaining wall 160. However, the present invention is not limited to this. In other embodiments of the present invention, the designer can also design other types of conductive retaining walls 160 according to requirements.

In the embodiment of FIG. 1, in order to effectively utilize the limited space in the cabinet, the dual-frequency loop feed 180 can be erected on the joint portion X of the first side cover 110 and the second side cover 120 upright. In this case, when the user opens the upper case of the notebook computer, that is, the upper case composed of the third side cover 130 and the fourth side cover 140, the dual-frequency loop feed 180 and the cavity The body CVT resonates to provide the first frequency band signal and the second frequency band signal, and the first frequency band signal and the second frequency band signal are outputted in the direction of the seam portion X, and the first side signal is passed through the three side covers 130 and the fourth side cover 140. The frequency band signal and the second frequency band signal are reflected outward, so that the antenna efficiency of the electronic device 100 can be further increased. In addition, in order to ensure that the dual-frequency loop feed 180 can transmit and receive signals, the joint portion X to which the dual-frequency loop feed 180 is attached should be made of a non-conductive material, such as plastic.

Since the electronic device 100 can use the conductive surfaces 112 and 122 on the chassis to form a cavity CVT with the conductive retaining wall 160, and can resonate with the dual-frequency loop feed 180, it can provide first-frequency signals and first-frequency signals of different frequency ranges. The two-band signal, because of the design of the electronic device 100, can reduce the voltage standing wave ratio and improve the efficiency of the antenna when the space is extremely limited. In addition, since the dual-frequency loop feed 180 can stand upright between the first side cover 110 and the second side cover 120, the designer's flexibility when placing the antenna feed is also increased.

FIG. 6 is a schematic diagram of an electronic device 300 according to an embodiment of the present invention. The electronic device 300 has a similar structure to the electronic device 100. However, the electronic device 300 may include a first side cover 310, a second side cover 320, a third side cover 330, a fourth side cover 340, ground plates 350 and 350 ', and a conductive structure. The retaining wall 360, the feeders 370 and 370 ', and the matching circuits 390 and 390' differ from the foregoing embodiments in that at least one dual-frequency loop feed is two dual-frequency loop feeds, that is, the first dual-frequency loop feed 380, the first Two dual frequency loop feeds 380 '.

The second dual-frequency loop feed 380 'may be independently provided from the first dual-frequency loop feed 380, and may be disposed in parallel with the conductive blocking wall 360 and stands between the first conductive surface 312 and the second conductive surface 322. The second dual-frequency loop feed 380 'and the first dual-frequency loop feed 380 may have the same structure. For example, the second dual-frequency loop feed 380 ′ and the first dual-frequency loop feed 380 may be selected to be implemented by the dual-frequency loop feed 180 shown in FIG. 2, or may be selected by using the dual-frequency loop feed 180 shown in FIG. 3. The dual-frequency loop feed 280 is implemented, and can be coupled with other components according to the aforementioned manner.

In addition, in order to reduce the interference between the second dual-frequency loop feed 380 'and the first dual-frequency loop feed 380 during operation, in FIG. 6, the second dual-frequency loop feed 380' and the first dual-frequency feed The loop feed 380 can be erected in a mirror-symmetric manner between the first conductive surface 312 and the second conductive surface 322 to improve the isolation between the second dual-frequency loop feed 380 ′ and the first dual-frequency loop feed 380. degree. For example, a portion of the first dual-frequency loop feed 380 that is coupled to the ground plate 350 will be close to a portion of the second dual-frequency loop feed 380 'that is coupled to the ground plate 350'.

In FIG. 6, the electronic device 300 further includes a conductive member 362. The conductive member 362 is vertically coupled to the first conductive surface 312 and the second conductive surface 322 and is coupled to the conductive retaining wall 360. The conductive member 362 may be disposed on Between the first dual-frequency loop feed 380 and the second dual-frequency loop feed 380 ', the cavity CVT formed by the conductive retaining wall 360, the first conductive surface 312 and the second conductive surface 322 is divided into two. Small cavity CVT '. However, in some embodiments of the present invention, the conductor 362 may be omitted, and the first dual-frequency loop feed 380 and the second dual-frequency loop feed 380 'may share the same cavity CVT.

In the embodiment of FIG. 6, in order to effectively use the limited space in the cabinet, the dual-frequency loop feeds 380 and 380 ′ can be vertically attached to the joint portion X of the first side cover 310 and the second side cover 320. . In this case, when the user opens the upper case of the notebook computer, that is, the upper case formed by opening the third side cover 330 and the fourth side cover 340, the dual-frequency loop feed 380 is in the cavity. The body CVT resonates to provide the first frequency band signal and the second frequency band signal, and the first frequency band signal and the second frequency band signal are outputted in the direction of the seam portion X, and the first side signal is passed through the three side covers 130 and the fourth side cover 140. The frequency band signal and the second frequency band signal are reflected outward, so that the antenna efficiency of the electronic device 300 can be further increased.

FIG. 10 is a schematic diagram of frequency isolation of the electronic device 300. In Figure 10, the isolation of the first frequency band signal can correspond to the isolation of the frequency range selected by B1 in the figure, and the isolation of the second frequency band signal can correspond to the frequency range of the frequency selected by B2 in the figure. Isolation. It can be seen from FIG. 10 that the isolation of the electronic device 300 in the frequency range of the first frequency band signal (that is, 2.4G to 2.5G Hz) and the frequency range of the second frequency band signal (that is, 4.9G to 5.9GHz) can be maintained at Below -15dB.

In some embodiments of the present invention, when the conductive surface 312 of the first side cover 310, the conductive surface 322 of the second side cover 320, and the conductive retaining wall 360 can collectively form a cavity CVT, the third side cover 330 And the fourth side cover 340 may not include a conductive surface, and may instead be made of a non-conductive material, or only the third side cover 330 includes a conductive surface, and the fourth side cover 340 may not include a conductive surface. Even in some embodiments of the present invention, the electronic device of the present invention can be used in a tablet computer. At this time, the electronic device does not include a third side cover and a fourth side cover.

FIG. 7 is a schematic diagram of an electronic device 400 according to an embodiment of the present invention. The electronic device 400 and the electronic device 300 have a similar structure. The electronic device 400 may include a first side cover 410, a second side cover 420, ground plates 350 and 350 ', a conductive retaining wall 360, feeders 370 and 370', and a first double The frequency loop feed 380, the second dual-frequency loop feed 380 ', and the matching circuits 390 and 390'. In other words, the main difference between the electronic device 400 and the electronic device 300 in FIG. 6 is that the electronic device 400 in FIG. 7 includes only the first side cover 410 and the second side cover 420, and the electronic device 300 in FIG. 6 includes the first side cover 410 and the second side cover 420. The side cover 310, the second side cover 320, the third side cover 330, and the fourth side cover 340.

The electronic device 400 may be used by a tablet computer. For example, the first side cover 410 may be a metal base of the tablet computer, and the second side cover 420 may be a metal upper cover including a screen, that is, the first side cover 410 The first conductive surface 412 may be a metal surface of a metal base of the first side cover 410, and the second conductive surface 422 of the second side cover 420 may be a metal surface of a metal upper cover of the second side cover 420. In this case, the metal retaining wall 360, the first conductive surface 412, and the second conductive surface 422 may form a cavity CVT together and resonate with the first dual-frequency loop feed 380 and the second dual-frequency loop feed 380 '. To provide a first frequency band signal and a second frequency band signal.

In summary, the electronic device provided by the embodiment of the present invention can form a cavity by using the conductive surface on the casing and the conductive retaining wall, and can resonate with the dual-frequency loop feed to provide frequency bands of different frequency ranges. Signal, it is possible to reduce the voltage standing wave ratio of the electronic device and improve the antenna efficiency in the case of extremely limited space. In addition, because the dual-frequency loop feed can be set upright in the casing, it also increases the flexibility of the designer when placing the antenna feed. The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the scope of the present invention.

100, 300, 400‧‧‧ electronic devices
110, 120, 130, 140, 310, 320, 330, 340, 410, 420‧‧‧ side cover
112, 122, 312, 322, 412, 422‧‧‧ conductive surface
150, 350, 350'‧‧‧ ground plate
160、360‧‧‧Conductive retaining wall
CVT, CVT'‧‧‧ Cavity
362‧‧‧Conductor
170, 370, 370'‧‧‧ feeder
180, 280, 380, 380'‧‧‧ dual frequency loop feed
190, 390, 390'‧‧‧ matching circuits
181, 182, 183, 184, 281, 282, 283, 284‧‧‧ radiated blocks
285‧‧‧Connection Department
A‧‧‧Slot
A1‧‧‧First child slot
A2‧‧‧Second child slot
FP‧‧‧feed point
192‧‧‧Capacitor
194‧‧‧Inductance
L1, L2, L3, W1‧‧‧ side
g1, g2, g3, g4, g5, g6‧‧‧ clearance
162‧‧‧Conductive cloth
164, 166, 168‧‧‧ support structure
V‧‧‧Speaker
X‧‧‧Seams
B1, B2‧‧‧‧Spectral range
810, 820, 910, 920‧‧‧ curves

FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a dual-frequency loop feed according to an embodiment of the present invention. FIG. 3 is a schematic diagram of a dual-frequency loop feed according to another embodiment of the present invention. FIG. 4 is a partially enlarged view of the electronic device of FIG. 1. FIG. 5 is a partial cross-sectional view of the cavity of the electronic device of FIG. 1. FIG. 6 is a schematic diagram of an electronic device according to another embodiment of the present invention. FIG. 7 is a schematic diagram of an electronic device according to another embodiment of the present invention. FIG. 8 is a graph of a voltage standing wave ratio versus frequency of an electronic device according to an embodiment of the present invention. FIG. 9 is a graph of a voltage standing wave ratio versus frequency of an electronic device according to an embodiment of the present invention. FIG. 10 is a schematic diagram of the frequency isolation of the electronic device in FIG. 6.

300‧‧‧ electronic device

310, 320, 330, 340‧‧‧ side cover

312, 322‧‧‧ conductive surface

350, 350’‧‧‧ grounding lug

360‧‧‧Conductive retaining wall

362‧‧‧Conductor

370, 370’‧‧‧ feeder

380, 380’‧‧‧ dual-frequency loop feed

390, 390’‧‧‧ matching circuit

CVT, CVT’‧‧‧ Cavity

X‧‧‧Seams

Claims (16)

An electronic device includes: a first side cover having a first conductive surface; a second side cover having a second conductive surface; the second side cover is disposed opposite to the first side cover and used to communicate with the first side cover; The first side cover is combined into a casing; a conductive retaining wall is vertically coupled to the first conductive surface and the second conductive surface to form a cavity together; and at least one dual-frequency loop feed body is connected to the conductive body. The retaining wall is arranged in parallel and stands between the first conductive surface and the second conductive surface. Each dual-frequency loop feed includes: a feeding end; a grounding end coupled to the second conductive surface; a first A radiation block having a feeding point coupled to the feeding end; a second radiation block having one end coupled to the first radiation block; a third radiation block opposite to the first radiation block Block arrangement, coupled between the other end of the second radiation block and the ground; and a fourth radiation block, which is disposed relative to the second radiation block, is coupled to the first radiation block and Between the third radiation block, wherein the first radiation block, the second radiation block, and the third radiation block And the fourth radiation block is formed around a rectangular feed with a slot, wherein the dual-frequency loop feed resonates in the cavity to provide a first-band signal and a second-band signal. The electronic device according to claim 1, further comprising a matching circuit disposed in the slot, wherein the feeding end is coupled to the feeding point via the matching circuit. The electronic device according to claim 2, wherein the matching circuit includes an inductor and a capacitor, the inductor is coupled to the feeding terminal, and the capacitor is coupled to the inductor and the feeding point. The electronic device according to claim 1, wherein the dual-frequency loop feed further includes a connecting portion, the connecting portion is disposed in the slot, and is coupled to the first radiation block and the second radiation block. The slot is divided into a first sub slot and a second sub slot by the connecting portion. The electronic device according to claim 4, wherein the first radiation block, the connection part, the second radiation block, the third radiation block, and the fourth radiation block surround the first sub-slot. And the first radiating block, the second radiating block, and the connecting portion surround the second sub-slot. The electronic device according to claim 1, wherein there is a gap between the dual-frequency loop feed and the first conductive surface. The electronic device according to claim 1 or 6, wherein there is a gap between the dual-frequency loop feed and the second conductive surface. The electronic device according to claim 1, wherein there is a gap between the dual-frequency loop feed and the conductive retaining wall. The electronic device according to claim 1, wherein a distance between the feeding point and the first conductive surface is smaller than a distance between the feeding point and the second conductive surface. The electronic device according to claim 1, wherein a length of the radiation block of the dual-frequency loop feed in a direction parallel to the setting direction of the third radiation block is greater than a length of the ground terminal coupled to the third radiator. According to the electronic device of claim 1, the at least one dual-frequency loop feed is a two-dual-frequency loop feed, and the two-dual-frequency loop feed is arranged in a mirrored manner and is arranged in parallel with the conductive retaining wall and stands on the Between the first conductive surface and the second conductive surface. The electronic device according to claim 11, further comprising a conductive member, which is vertically coupled to the first conductive surface and the second conductive surface, and the conductive member is coupled to the conductive retaining wall and disposed on the two Between dual-frequency loop feeds. The electronic device according to claim 1, further comprising a third side cover having a third conductive surface, and the third side cover is connected to the first side cover and / or the second side cover. The electronic device according to claim 13, further comprising a fourth side cover having a fourth conductive surface, the fourth side cover is disposed opposite to the third side cover, and combined with the third side cover to form another A case. The electronic device according to claim 1, wherein one of the frequency bands of the first frequency band signal is located at 2.4G ~ 2.5G Hz, and one of the frequency bands of the second frequency band signal is located at 4.9G ~ 5.9G Hz. The electronic device according to claim 1, wherein a distance between the feeding point and the first conductive surface is greater than a distance between the feeding point and the second conductive surface.