TWI612719B - Electronic device having antenna - Google Patents

Abstract

An electronic device having an antenna includes a first metal housing, a second metal housing, a first rotating shaft, a second rotating shaft, a ground connecting portion, a first antenna unit, and a first controllable capacitor connecting portion. The first rotating shaft, the first metal housing, the ground connecting portion and the second metal housing together constitute a first closed slot antenna structure. The first antenna unit located in the first closed-cell antenna structure has a first radiating portion, a first low-frequency feeding end and a first ground end. The first controllable capacitor connection portion is located in the first closed-cell antenna structure, and the first controllable capacitor connection portion is connected between the first metal shell and the second metal shell, and the first controllable capacitor connection portion A controllable capacitance value is controlled by the control unit. Thereby, the antenna can be integrated into the rotating shaft of the electronic device.

Description

Electronic device with antenna

The present invention relates to an electronic device, and more particularly to an electronic device having an antenna on a rotating shaft.

An electronic device with wireless communication capability or wireless networking capability is important for carrying convenience. For example, a notebook computer is a portable computer device. Referring to FIG. 1, the appearance of the notebook computer is mainly divided into three parts, namely, an upper cover 10 having a screen, a rotating shaft 20 and a lower cover 30, and the rotating shaft 20 is used for connecting the upper cover 10 and the lower cover 30. Because of the development of wireless networks, existing notebook computers have the necessary wireless network functions, and often use built-in antennas to keep the appearance simple, but most of them still consider the application of multiple communication bands, such as having operations at 2.4 at the same time. The IEEE 802.11b/g specification of the GHz band and the IEEE 802.11a/n/ac specification of the wireless local area network (WLAN) function of the 5 GHz band. Even some notebook computers must support wireless wide area network (WWAN) applications, such as the wireless networking capabilities of Long Term Evolution (LTE), which make the wireless communication band and bandwidth available for notebook devices more efficient. Increase.

For the aesthetic appearance and stability of use, the hidden design antenna of the notebook computer is usually disposed at a portion of the upper cover 10. However, in order to emphasize the aesthetic appearance of the current notebook computer, the manufacturer often greatly reduces the screen frame of the upper cover 10, so that the position of the antenna is greatly limited. In the same wireless communication quality even The requirement for higher wireless transmission performance is a rigorous challenge for antenna design technicians of notebook computers.

The embodiment of the invention provides an antenna design hidden in a hinge of a notebook computer, which can realize a wireless wide area network (WWAN) with a switchable operating frequency of the notebook computer, and a wireless local area network (WLAN) or WiFi (including 2.4GHz and 5GHz) applications.

An embodiment of the present invention provides an electronic device having an antenna, including: a first metal housing, a second metal housing, a first rotating shaft, a second rotating shaft, a ground connecting portion, a first antenna unit, and a first controllable capacitor connection. unit. The first metal housing has a first side. The second metal housing has a second side. The first rotating shaft is electrically connected between the first side of the first metal casing and the second side of the second metal casing. The second rotating shaft is electrically connected between the first side of the first metal casing and the second side of the second metal casing. The grounding connection portion is located between the first rotating shaft and the second rotating shaft, and electrically connects the first side of the first metal casing and the second side of the second metal casing, wherein the first rotating shaft, the first metal shell, The ground connection portion and the second metal housing together constitute a first closed slot antenna structure. The first antenna unit has a first radiating portion, a first low frequency feeding end and a first ground end. The first low frequency feeding end is connected to the first ground end to the first radiating portion, and the first antenna unit is located in the first closed slot. In the hole antenna structure, the end of the first radiating portion is parallel to the first side of the first metal casing and close to the first rotating shaft, and the first ground end of the first antenna unit is electrically connected to the second portion of the second metal casing a first low frequency feed end of the first antenna unit is configured to feed the first low frequency RF signal, wherein when the first low frequency RF signal is fed by the first low frequency feed end, the first antenna unit is configured to be inverted F-shaped panel antenna. The first controllable capacitor connection portion is located in the first closed slot antenna structure, The first controllable capacitor connection portion has a first end and a second end, and the first controllable capacitor connection portion has a first controllable capacitance value between the first end and the second end, and the first controllable capacitor connection portion One end is connected to the first side of the first metal casing, and the second end of the first controllable capacitor connection is connected to the second side of the second metal casing, and the first controllable capacitor of the first controllable capacitor connection portion The value is controlled by the control unit.

In summary, an embodiment of the present invention provides an electronic device having an antenna. The position of the antenna is disposed near a rotating shaft of two metal housings connected to the electronic device, and the grounding connecting portion is used to cooperate with the rotating shaft to realize the closed slot antenna structure. And the two metal housings of the electronic device are connected in the closed-cell antenna structure by using the controllable capacitor connection portion to reduce the resonance frequency of the closed-cell antenna to reduce the space occupied by the antenna. Thereby, the antenna can be integrated into the rotating shaft of the electronic device, especially for an electronic device having a metal casing.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings The scope is subject to any restrictions.

10‧‧‧Upper cover

20‧‧‧ shaft

30‧‧‧Under the cover

40‧‧‧First metal shell

401‧‧‧ first side

50A‧‧‧First shaft

50B‧‧‧second shaft

60‧‧‧Second metal casing

601‧‧‧ second side

70‧‧‧Ground connection

80‧‧‧First closed slot antenna structure

81‧‧‧First antenna unit

82‧‧‧First controllable capacitor connection

811‧‧‧First Radiation Department

812‧‧‧First low frequency feed end

813‧‧‧First ground

814‧‧‧First high frequency feed end

Ca‧‧‧Switching capacitor

100‧‧‧Control circuit

M1, M2, M3‧‧‧ mode

A1, A2, A3, A4, B1, B2, B3‧‧‧ curves

C1‧‧‧first capacitor

L1‧‧‧first inductance

90‧‧‧Second closed slot antenna structure

91‧‧‧Second antenna unit

92‧‧‧Second controllable capacitor connection

Figure 1 is a schematic diagram of a conventional notebook computer.

2 is a schematic diagram of an electronic device with an antenna according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a first closed slot antenna structure and a first antenna unit of an electronic device with an antenna according to an embodiment of the present invention.

4 is a first lost slot antenna structure of FIG. 3 and a Return Loss diagram of the first antenna unit fed at the first low frequency feed end.

FIG. 5 is a schematic diagram of the controllable capacitor connection of FIG. 3 removed to form a closed-cell antenna.

Figure 6 is a diagram showing the return loss of the closed-cell antenna of Figure 5.

7 is a schematic diagram showing a change in return loss of moving the position of the first controllable capacitor connection portion to the first antenna unit in the first closed-cell antenna structure of FIG.

8 is a diagram showing the first closed-cell antenna structure of FIG. 3 and the return loss of the first antenna unit fed at the first high-frequency feed end.

FIG. 9 is a schematic diagram of a notebook computer using a first closed slot antenna structure and a second closed slot antenna structure according to another embodiment of the present invention.

The electronic device of the embodiment of the present invention is, for example, a notebook computer, but the present invention is not limited thereto, and the antenna design of the embodiment of the present invention is applicable as long as it is an electronic device having two metal casings and a rotating shaft connecting the two. The embodiment of the invention realizes multi-frequency antenna design by using the rotating shaft of the body of the notebook computer, and can be used for a wireless wide area wide area network (WWAN) (for example, Long Term Evolution (LTE) frequency band and wireless local area network (WLAN) or WiFi. The application of the notebook computer (including 2.4 GHz and 5 GHz). Please refer to FIG. 2, which is a front view of the notebook computer according to the embodiment of the present invention. The upper and lower covers of the notebook computer of the embodiment of the present invention are respectively the first metal shell. The body and the second metal casing make the notebook computer a metal casing. The configuration of the keyboard, the screen, etc. is omitted in FIG. 2, thereby highlighting the main components of the embodiment. In terms of the main structure of the notebook computer, the notebook computer includes a first metal casing 40 (upper cover) having a screen, a first rotating shaft 50A, a ground connecting portion 70, a second rotating shaft 50B, and a second metal casing 60 (lower cover). The first rotating shaft 50A and the second rotating shaft 50B are used. Connecting the first metal casing 40 and the second metal casing 60. The first rotating shaft 50A and the second rotating shaft 50B are also made of metal. On the other hand, the ground connection portion 70 may be a signal connection line between the system circuit of the second metal casing 60 and the first metal casing 40, for example, a cable including a screen display signal (or a signal line including a video lens). The signal lines such as the wires also have a ground wire or a metal shield so that the signal of the system circuit of the second metal casing 60 can be supplied to the relevant circuit in the first metal casing 40, but the invention is not limited thereto. The ground connection 70 can also be a grounded metal component of other functions or uses (connected to the system circuit ground). In another embodiment, the ground connection portion 70 may also be another rotation shaft (or referred to as a third rotation shaft) and electrically connect the first metal housing 40 and the second metal housing 60, but the present invention is not The ground connection portion 70 is defined as long as the ground connection portion 70 can be used to be disposed between the first rotating shaft 50A and the second rotating shaft 50B, and is configured to electrically connect the first metal shell 40 and the second metal shell. Body 60.

Next, the connection relationship between the first metal casing 40 (upper cover), the first rotating shaft 50A, the ground connecting portion 70, the second rotating shaft 50B, and the second metal casing 60 (lower cover), the first metal casing, will be described. 40 has a first side 401. The second metal housing 60 has a second side 601. The first rotating shaft 50A is disposed between the first side 401 of the first metal casing 40 and the second side 601 of the second metal casing 60. The second rotating shaft 50B is disposed between the first side 401 of the first metal casing 40 and the second side 601 of the second metal casing 60. The grounding connection portion 70 is located between the first rotating shaft 50A and the second rotating shaft 50B, and electrically connects the first side 401 of the first metal casing 40 and the second side 601 of the second metal casing 60, wherein the first rotating shaft The first metal housing 40, the ground connection portion 70, and the second metal housing 60 together form a first closed slot antenna structure 80.

In addition, the electronic device (notebook) having an antenna further includes a first antenna unit 81 disposed in the first closed-cell antenna structure 80 and the first The capacitor connection portion 82 is controlled. Please refer to FIG. 3. FIG. 3 is a schematic diagram of a first closed slot antenna structure and a first antenna unit of an electronic device with an antenna according to an embodiment of the present invention. The first antenna unit 81 has a first radiating portion 811, a first low frequency feeding end 812 and a first grounding end 813. The first low frequency feeding end 812 is connected to the first grounding end 813 to the first radiating portion 811, the first day. The line unit 81 is located in the first closed-cell antenna structure 80. The end of the first radiating portion 811 is parallel to the first side 401 of the first metal casing 40 and adjacent to the first rotating shaft 50A, and the first antenna unit 81 is A grounding end 813 is electrically connected to the second side 601 of the second metal housing 60. The first low frequency feeding end 812 of the first antenna unit 81 is configured to feed the first low frequency RF signal, wherein the first low frequency signal is used. When the feeding end 812 feeds the first low frequency RF signal, the first antenna unit 81 constitutes an inverted F-shaped panel antenna. The first controllable capacitor connection portion 82 is located in the first closed-cell antenna structure 80 and is located between the first antenna unit 81 and the ground connection portion 70. The first controllable capacitor connection portion 82 has a first end 821 and a first end. The second end 822 has a first controllable capacitance value between the first end 821 and the second end 822 of the first controllable capacitor connection portion 82. The first controllable capacitance value is used, for example, on a microwave substrate (or a printed circuit board). The circuit is provided with a controllable capacitance value element such as a switching capacitor or a variable capacitor, but the invention is not limited thereto. For example, in the embodiment, the first controllable capacitance value is controlled by the control unit 100 to be connected to the switching capacitor Ca between the first end 821 and the second end 822, and the switching capacitor Ca can also be replaced by a variable capacitor, but The invention is not limited thereby. The control line of the control unit 100 in Fig. 3 is only a schematic diagram (indicated by a dashed line with arrows), and the control lines in actual application are not so limited. The first end 821 of the first controllable capacitor connection portion 82 is connected to the first side 401 of the first metal housing 40, and the second end 822 of the first controllable capacitor connection portion 82 is connected to the second side of the second metal housing 60. The side 601, the first controllable capacitance value of the first controllable capacitor connection portion 82 is controlled by the control unit 100, and the control unit 100 is disposed, for example, in the second metal housing 60. Inside, as part of the system circuit of the notebook computer.

Next, please refer to FIG. 4. FIG. 4 is a diagram of a first closed slot antenna structure of FIG. 3 and a Return Loss diagram of the first antenna unit fed by the first low frequency feed end. When the first low frequency RF signal is fed by the first low frequency feeding end 812, the first low frequency feeding end 812 and the first antenna unit 81 serve as an excitation source of the first closed slot antenna structure 80, and the first closed slot antenna The structure 80 excites the modal M1 of the one-half wavelength resonant form, and by adjusting the first controllable capacitance value of the first controllable capacitive connection 82, the center frequency point of the modal M1 can be varied. The desired frequency of the modality M1 can be selected by the control unit 100 controlling the first controllable capacitance value of the switching capacitor Ca. In the present embodiment, in order to achieve the low-frequency mode M1 up to the impedance bandwidth of the operating frequency of LTE 700 (698 MHz-787 MHz), the length L of the first closed-cell antenna structure 80 is about 105 mm (mm), and the width. W is about 7 mm, the distance between the first controllable capacitor connection 82 and the ground connection 70 is about 9.5 mm, and the first controllable capacitance value of the first controllable capacitor connection 82 used can be, for example, 2 pF, 2.4. Switch between pF, 2.8pF and 3.8pF capacitance range. Furthermore, the distance of the end of the first radiating portion 811 parallel to the first side 401 is about 1 mm, and the distance between the end of the first radiating portion 811 and the first rotating shaft 50A is about 15 mm. In another embodiment, the frequency range of the low frequency mode M1 may also be a frequency band including GSM 850 and GSM 900, and the frequency ranges are 824-960 MHz and 880-960 MHz, respectively. In addition, the mode M2 shown in FIG. 4 is a high-order mode of the mode M1.

The first closed-cell antenna structure 80 of the embodiment of the present invention is a one-half-wavelength closed-cell antenna. However, the first closed-cell antenna structure of the embodiment of the present invention is different from the conventional closed-cell antenna. 80 has a first controllable capacitive connection 82. Referring to the return loss curve shown in FIG. 4, the curves A1, A2, A3, and A4 are the first controllable capacitance values of the first controllable capacitor connection portion 82 of 2 pF, 2.4 pF, 2.8 pF, and 3.8 pF, respectively. the result of. As can be seen from FIG. 4, when the first controllable capacitance value controlled by the control unit 100 is increased, the operating frequency of the excitation mode of the first closed-cell antenna structure 80 is lowered. At the same time, the first low frequency feed end 812 of the first antenna unit 81 is connected in series with the first capacitor C1, and the first ground end 813 of the first antenna unit 81 is connected in series with the first inductor L1 to help impedance matching. The first antenna unit 81 is realized, for example, by a metal structure printed on a microwave substrate, for example, a microwave substrate printed on a length of 25 mm and a width of 6 mm. The first capacitor C1 and the first inductor L1 are surface adhesion components (SMD), such as a wafer capacitor and a chip inductor, which are respectively electrically connected (series) by a solder connection to the first low frequency feed end 812 and the first ground end 813. . In the present embodiment, the capacitance value of the first capacitor C1 is 2.4 pF, and the inductance value of the first inductor L1 is 13 nH, but the present invention is not limited thereto. In addition, the first grounding end 813 can also be provided with a switch to control the open circuit and the short circuit, so that when the first low frequency feeding end 812 is fed, the first grounding end (after the series connection of the first inductor L1) is short-circuited to ground (connected Ground to the system circuit).

Please refer to FIG. 5 , which is a schematic diagram of the controllable capacitor connection portion of FIG. 3 removed to form a closed slot antenna. If the first controllable capacitor connection 82 provided in FIG. 3 of the embodiment of the present invention is removed, and the impedance bandwidth of the operating frequency of the low frequency up to LTE 700 (698 MHz-787 MHz) is reached, the slot needs to be The length is extended to 135 mm (mm), and the return loss value of Fig. 6 can be seen. Comparing the return loss of FIG. 6 with the return loss of FIG. 4, it can be seen that if the first controllable capacitor connecting portion 82 of the embodiment of the present invention is not used, the length of the slot needs to be extended (from 105 mm to 135 mm). The impedance bandwidth of the operating frequency with a minimum frequency of approximately LTE 700 (698 MHz-787 MHz) can be achieved. It can be seen that the first controllable capacitor connecting portion 82 of the embodiment of the present invention can achieve the purpose of reducing the size of the closed slot antenna structure.

The first RF signal can be in addition to the Long Term Evolution (LTE) band. In addition to the signal, the first RF signal can also be a signal in the GSM 850/900 (824-960 MHz) band, a signal in the GSM 1800/1900/UMTS (1710-2170 MHz) band, or an LTE 2300/2500 (2300-2690 MHz). ) The signal of the band. Alternatively, the first RF signal may also be a 2.4 GHz band signal for a 2.4 GHz wireless local area network application. Corresponding to the antenna design of FIG. 3, for example, corresponding to the return loss of FIG. 4, the modality M1 can be applied to an associated frequency band application below 1 GHz, and the modality M2 can be applied to a frequency band around 1.3 GHz. Furthermore, referring again to FIGS. 3 and 4, the first radiating portion 811 of the first antenna unit 81 can provide a resonant mode M3 having a frequency of around 2.4 GHz, which is a quarter-wave resonant mode.

Next, referring to FIG. 7, if the position of the first controllable capacitor connecting portion 82 is moved to the first antenna unit 81, the position of the first controllable capacitor connecting portion 82 is displaced to the first antenna unit 81, respectively. In millimeters, 10 mm and 15 mm, the return loss curves are B1, B2, and B3, respectively. That is, when the distance between the first controllable capacitor connecting portion 82 and the ground connecting portion 70 is 14.5 mm, 19.5 mm, and 24.5 mm, the return loss curves are B1, B2, and B3, respectively. Compared with the return loss curve B0 before the movement, if the first controllable capacitor connecting portion 82 is moved to the first antenna unit 81, the center frequency of the operating mode of the lowest frequency of the closed-cell antenna structure 80 can be lowered. And as the first controllable capacitor connection portion 82 is closer to the first antenna unit 81, the lower the center frequency of the operational mode. In short, when the distance between the first controllable capacitor connection portion 82 and the first antenna unit 81 is shortened, the operating frequency of the excitation mode of the first closed-cell antenna structure 80 is lowered. This can be explained by the fact that the capacitance of the first controllable capacitor connection 82 can store a large charge (relative to the closed cell itself and the first antenna unit 81), and can feed the excited current to the antenna. Providing a large degree of current steering, it can provide an effect equivalent to extending the current path and causing frequency reduction. When the first controllable capacitor connection portion 82 is connected When the first antenna unit 81 having the signal excitation source (the first low frequency feed end 812) is near, the effect of the equivalent extended current path becomes more and more obvious, so that the frequency point of the resonant mode of the first closed slot antenna structure 80 It can be further reduced.

Next, please refer to FIG. 3 and FIG. 8 simultaneously, the first antenna unit 81 further has a first high frequency feeding end 814, and the first high frequency feeding end 814 is connected to the first radiating portion 811, and the first high frequency feeding end 814 is used to feed the first high frequency RF signal. On the other hand, when the first low frequency feed end 812 feeds in the signal, the first high frequency feed end 814 is open. The first high frequency RF signal is a 5 GHz band signal that can be used in a wireless local area network (WLAN) or WiFi application in the 5 GHz band. When the first high frequency feeding end 814 feeds the first high frequency RF signal, the first low frequency feeding end 812 and the first grounding end 813 can be controlled by the respective control unit 100 connected by the first high frequency feeding end 812 (Fig. It is set to an open state without being shown. At this time, the first radiating portion 811 of the first antenna unit 81 is a quarter-wave monopole antenna having two branches, and the short branch extends to the end of the first radiating portion 811 (near the first rotating shaft 50A) The short leg has a length of about 7 mm, and the long leg is a portion that extends to the first low frequency feed end 812 (and the first ground end 813), and the length of the long leg is about 15 mm. However, the above dimensions are for illustrative purposes only and are not intended to limit the invention.

In practical applications, the size of notebook computers used in embodiments of the present invention is typically as small as about 11 to 12 inches in the current market, and the maximum is typically no more than 15 inches. Therefore, if the dual antenna design is used in the rotating shaft of the notebook computer of the embodiment, the antenna design of the embodiment of the present invention can be easily designed because of the effect of reducing the length (L) of the closed slot. A hinge applied to a notebook computer. According to the above, please refer to FIG. 9. FIG. 9 is a schematic diagram of a notebook computer using a first closed slot antenna structure and a second closed slot antenna structure according to another embodiment of the present invention. Ground connection portion 70, first metal housing 40, second rotating shaft 50B and second metal The housings 60 collectively form a second closed slot antenna structure 90. Regarding the design of the second closed slot antenna structure 90, the details of the second closed slot antenna structure 90 and the second antenna unit 91 and the second controllable capacitive connection 92 therein are similar to the embodiment of FIG. The design principle differs only in that the first closed slot antenna structure 80 and the second closed slot antenna structure 90 are symmetrical to each other. In detail, the second antenna unit 91 has a second radiating portion, a second low frequency feeding end and a second ground end (refer to the first radiating portion 811, the first low frequency feeding end 812 and the first for FIG. 3, respectively). Description of a ground terminal 813). The second low frequency feeding end is connected to the second ground end to the second radiating portion, the second antenna unit 91 is located in the second closed slot antenna structure 90, and the end of the second radiating portion is parallel to the first of the first metal housing 40. The second ground end of the second antenna unit 91 is electrically connected to the second side 601 of the second metal housing 60, and the second low frequency feed of the second antenna unit 91 is connected to the second rotating shaft 50B. The terminal is configured to feed the second low frequency RF signal, wherein when the second low frequency RF signal is fed by the second low frequency feeding end, the second antenna unit 91 forms an inverted F-shaped panel antenna. The second controllable capacitor connection portion 92 is located in the second closed-cell antenna structure 90 and is located between the second antenna unit 91 and the ground connection portion 70. The application in FIG. 9 is due to the side of the rotating shaft of the notebook computer. The other ground connection portion 70 can be used, but in practical applications, the two ground connection portions 70 in FIG. 9 can be integrated into a single ground connection portion. The second controllable capacitor connection portion 92 has a first end and a second end, and the second controllable capacitor connection portion 92 has a second controllable capacitance value between the first end and the second end (for example, using a switching capacitor), The first end of the second controllable capacitor connection portion 92 is connected to the first side 401 of the first metal housing 40, and the second end of the second controllable capacitor connection portion 92 is connected to the second side 601 of the second metal housing 60. The second controllable capacitance value of the second controllable capacitor connection portion 92 is controlled by the control unit (not shown in FIG. 9, please refer to FIG. 3 and the foregoing related description). Furthermore, the second antenna unit 92 further has a second high frequency feed end (refer to the first high frequency for FIG. 3). The second high frequency feed end is connected to the second high frequency RF signal, and the second high frequency RF signal is a 5 GHz frequency band signal. . When the second low frequency feed end feeds the signal, the second high frequency feed end is open. When the second high frequency feed end feeds the second high frequency RF signal, the second low frequency feed end and the second ground end are open. Moreover, the second low frequency feed end of the second antenna unit 92 is connected in series with the second capacitor (refer to the description of the first capacitor C1 of FIG. 3), and the second ground end of the second antenna unit 92 is connected in series with the second inductor (refer to For the description of the first inductor L1 of FIG. 3). Moreover, when the distance between the second controllable capacitor connection portion 92 and the second antenna unit 91 is shortened, the operating frequency of the excitation mode of the second closed-cell antenna structure 90 is lowered.

In summary, the electronic device with an antenna provided by the embodiment of the present invention has an antenna disposed near the rotating shaft of the two metal casings of the connected electronic device, and the grounding connection portion is used to cooperate with the rotating shaft to realize the closed slot. The antenna structure and the two metal housings of the electronic device are connected in the closed-cell antenna structure by using the controllable capacitor connection portion to reduce the resonance frequency of the closed-cell antenna to reduce the space occupied by the antenna. Thereby, the antenna can be integrated into the rotating shaft of the electronic device, especially for an electronic device having a metal casing. Moreover, according to the embodiment of the present invention, the antenna design provided by the embodiment of the present invention can be applied to LTE 700 (698MHz-787MHz), GSM 850 (824-960MHz), GSM 900 (880-) of a wireless wide area network (WWAN). 960MHz), GSM 1800/1900/UMTS (1710-2170MHz), LTE 2300/2500 (2300-2690MHz), 2.4GHz wireless local area network (WLAN) and 5GHz WiFi wireless LAN.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the invention.

40‧‧‧First metal shell

401‧‧‧ first side

50A‧‧‧First shaft

50B‧‧‧second shaft

60‧‧‧Second metal casing

601‧‧‧ second side

70‧‧‧Ground connection

80‧‧‧First closed slot antenna structure

81‧‧‧First antenna unit

82‧‧‧First controllable capacitor connection

811‧‧‧First Radiation Department

812‧‧‧First low frequency feed end

813‧‧‧First ground

814‧‧‧First high frequency feed end

Ca‧‧‧Switching capacitor

100‧‧‧Control unit

C1‧‧‧first capacitor

L1‧‧‧first inductance

Claims (10)

An electronic device having an antenna, comprising: a first metal housing having a first side; a second metal housing having a second side; and a first rotating shaft electrically connected to the first metal Between the first side of the second metal housing and the second side of the second metal housing; a second rotating shaft electrically connected to the first side of the first metal housing and the second metal shell Between the second side of the body; a ground connection portion between the first rotating shaft and the second rotating shaft, and electrically connecting the first side of the first metal shell and the second metal shell The second side, wherein the first rotating shaft, the first metal housing, the ground connecting portion and the second metal housing together form a first closed slot antenna structure; a first antenna unit having a first radiating portion, a first low frequency feeding end and a first ground end, wherein the first low frequency feeding end and the first ground end are connected to the first radiating portion, and the first antenna unit is located at the first In the closed slot antenna structure, the end of the first radiating portion is parallel to the first side of the first metal housing And the first grounding end of the first antenna unit is electrically connected to the second side of the second metal housing, the first low frequency feeding end of the first antenna unit For feeding a first low frequency RF signal, wherein when the first low frequency RF signal is fed by the first low frequency feed end, the first antenna unit constitutes an inverted F-shaped panel antenna; and a first controllable The first controllable capacitor connection has a first end and a second end, and is located between the first antenna unit and the ground connection. a first controllable capacitance value between the first end and the second end of the first controllable capacitor connection portion, the first controllable capacitor connection portion The first end is connected to the first side of the first metal casing, and the second end of the first controllable capacitor connection is connected to the second side of the second metal casing, the first controllable The first controllable capacitance value of the capacitive connection is controlled by a control unit. The electronic device with an antenna according to claim 1, wherein the electronic device having the antenna is a notebook computer. The electronic device with an antenna according to claim 1, wherein an operating frequency of the excitation mode of the first closed-cell antenna structure is increased when the first controllable capacitance value controlled by the control unit is increased. reduce. The electronic device with an antenna according to claim 1, wherein the first closed-cell antenna structure is a one-half wavelength closed-cell antenna. The electronic device with an antenna according to claim 1, wherein the excitation mode of the first closed-cell antenna structure is shortened when the distance between the first controllable capacitor connection portion and the first antenna unit is shortened. The operating frequency is reduced. The electronic device with an antenna according to claim 1, wherein the first low frequency feed end of the first antenna unit is connected in series with a first capacitor, and the first ground end of the first antenna unit is connected in series The first inductance. The electronic device with an antenna according to claim 1, wherein the first antenna unit further has a first high frequency feeding end, and the first high frequency feeding end is connected to the first radiating portion, the first A high frequency feed end is configured to feed a first high frequency RF signal, wherein the first high frequency RF signal is a signal of a 5 GHz band, wherein the first high frequency feed end body enters the first high frequency RF signal The first low frequency feed end and the first ground end are open. The electronic device with an antenna according to claim 1, wherein the ground connection portion, the first metal housing, the second rotating shaft and the second metal housing are combined The second closed-cell antenna structure further includes: a second antenna unit having a second radiating portion, a second low-frequency feeding end and a second ground end, the second low frequency The feed end is connected to the second ground end, the second antenna unit is located in the second closed slot antenna structure, and the end of the second radiating portion is parallel to the first part of the first metal shell One side of the second antenna unit is electrically connected to the second side of the second metal unit, and the second side of the second antenna unit is electrically connected to the second side of the second antenna unit The feed end is configured to feed a second low frequency RF signal, wherein when the second low frequency RF signal is fed by the second low frequency feed end, the second antenna unit constitutes an inverted F-shaped panel antenna; The second controllable capacitor connection portion is located between the second antenna unit and the ground connection portion, and the second controllable capacitor connection portion has a first end and a first a second end, the first end of the second controllable capacitor connection portion and the second end a first controllable capacitor value, the first end of the second controllable capacitor connection portion is connected to the first side of the first metal housing, and the second end of the second controllable capacitor connection portion is connected to the second side The second controllable capacitance of the second controllable capacitor connection is controlled by the control unit. The electronic device with an antenna according to claim 8, wherein the second antenna unit further has a second high frequency feeding end, and the second high frequency feeding end is connected to the second radiating portion, the first The second high frequency RF signal is a second high frequency RF signal, and the second high frequency RF signal is a 5 GHz frequency band signal, wherein the second high frequency RF signal is fed to the second high frequency RF signal The second low frequency feed end and the second ground end are open. The electronic device with an antenna according to Item 8, wherein the distance between the second controllable capacitor connection portion and the second antenna unit is shortened, the second closed The operating frequency of the excitation mode of the slot antenna structure is reduced.