TW201431187A - Mobile device and loop antenna therein - Google Patents

Abstract

A mobile device includes a metal frame, a display device, a host system, and a communication module. The display device is disposed in the metal frame. The communication module includes a metal board, a nonconductive housing, a loop antenna, and an RF (Radio Frequency) module. A hollow structure is formed by the metal board and the nonconductive housing. The RF module is coupled to the loop antenna and configured as a signal source of the loop antenna. The loop antenna and the RF module are disposed in the hollow structure, and are affixed to an inner surface of the nonconductive housing, the inner surface being opposite to the metal board. The mobile device is capable of operating in an open mode and a closed mode. When the mobile device operates in the close mode, the mobile device is used as a tablet computer, and the metal frame lies on the host system and the communication module.

Description

Mobile device and its loop antenna

The present invention relates to a mobile device, and more particularly to a mobile device and its loop antenna.

With the development of mobile communication technologies, mobile devices have become more and more popular in recent years, such as portable computers, mobile phones, multimedia players, and other portable electronic devices with mixed functions. In order to meet people's needs, mobile devices usually have the function of wireless communication. Some cover long-range wireless communication range, for example, mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and the 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz and 2500MHz bands used for communication. Others cover short-range wireless communication ranges. For example, Wi-Fi, Bluetooth, and WiMAX (Worldwide Interoperability for Microwave Access) systems use 2.4 GHz, 3.5 GHz, 5.2 GHz, and 5.8 GHz bands for communication.

In order to maintain good communication quality, antenna elements for wireless communication in mobile devices usually require sufficient clearance area for configuration, and no metal components can be placed in the clearance area. However, the internal space of the mobile device is limited, and sometimes the clearance area of the antenna element cannot be satisfied.

The invention provides a mobile device comprising: a metal outer frame; a display, disposed in the metal frame; a host system; and a communication module comprising: a metal plate; a non-conductor casing, wherein the metal plate and the non-conductor casing form a hollow structure; a loop antenna; And an RF module coupled to the loop antenna and serving as a signal source of the loop antenna; wherein the loop antenna and the RF module are disposed in the hollow structure and are attached to the non-conductor The inner surface of the outer casing is opposite to the metal plate; and wherein the mobile device is operable in an open state or a collapsed state, the mobile device acts as a tablet when operating in the collapsed state And the metal frame is laid flat on the host system and the communication module.

In addition, the present invention provides a loop antenna comprising: a first radiating portion, wherein an open slot is formed in the first radiating portion, the first radiating portion has a feeding end coupled to a signal source and The grounding end is coupled to one of the grounding potentials, and the opening slot separates the feeding end from the grounding end; and a second radiating portion is coupled to the grounding end of the first radiating portion.

100, 200‧‧‧ mobile devices

110‧‧‧Metal frame

120‧‧‧ display

130‧‧‧Host system

140‧‧‧Communication Module

150‧‧‧Metal plate

160‧‧‧Non-conductor housing

170, 300, 400, 500‧‧‧ loop antenna

180‧‧‧RF Module

210‧‧‧External keyboard

220‧‧ Wi-Fi module

310‧‧‧First Radiation Department

312‧‧‧Feed end of the first radiation section

314‧‧‧ Ground of the first radiating part

316‧‧‧The corner of the first Radiation Department

320, 520‧‧‧Second Radiation Department

330‧‧‧ Third Radiation Department

350‧‧‧Open slot

351‧‧‧Open end of open slot

390‧‧‧Signal source

D1‧‧‧ distance

E1‧‧‧Non-conductor outer surface

E2‧‧‧back surface of metal frame

FB1‧‧‧ first frequency band

FB2‧‧‧second frequency band

GND‧‧‧ Ground potential

Θ‧‧‧ angle

1 is a side view showing a mobile device according to an embodiment of the present invention; FIG. 2 is a side view showing a mobile device according to another embodiment of the present invention; and FIG. 3 is a view showing a mobile device according to another embodiment of the present invention; FIG. 4 is a plan view showing a loop antenna according to another embodiment of the present invention; FIG. 4 is a plan view showing a loop antenna according to another embodiment of the present invention; 5 is a plan view showing a loop antenna according to an embodiment of the present invention; and FIG. 6 is a diagram showing a return loss of a loop antenna according to an embodiment of the present invention.

In order to make the objects, features and advantages of the present invention more comprehensible, the specific embodiments of the invention are set forth in the accompanying drawings.

1 is a side view showing a mobile device 100 according to an embodiment of the present invention. The mobile device 100 can be a tablet computer, a notebook computer, or a combination of both. As shown in FIG. 1 , the mobile device 100 includes a metal frame 110 , a display 120 , a host system 130 , and a communication module 140 . The metal frame 110 is used to protect the display 120. The display 120 can include a liquid crystal module (LCM) and a touch module (not shown) and is disposed in the metal frame 110. The host system 130 can include a processor, a memory, and a mass storage device (not shown). The communication module 140 is used to provide wireless communication functions.

The communication module 140 includes at least a metal plate 150, a non-conductor casing 160, a loop antenna 170, and a radio frequency module 180. The communication module 140 may further include other components such as a system board and a battery (not shown). In some embodiments, the non-conductor housing 160 can be made of a plastic material. The RF module 180 is coupled to the loop antenna 170 and serves as a signal source for the loop antenna 170. The metal plate 150 and the non-conductor outer casing 160 form a hollow structure. The loop antenna 170 and the radio frequency module 180 are disposed in the hollow structure, and are all attached to On one inner surface E1 of the non-conductor outer casing 160, the inner surface E1 is opposed to the metal plate 150. In some embodiments, the inner surface E1 of the non-conductor outer casing 160 is substantially parallel to the metal plate 150. In the preferred embodiment, the mobile device 100 is operable in an open state or a collapsed state. In FIG. 1, when the mobile device 100 is operated in the collapsed state, the mobile device 100 can function as a tablet computer, and the metal frame 110 is laid flat on the host system 130 and the communication module 140. In more detail, in the collapsed state, the host system 130 and the communication module 140 both contact the back surface E2 of the metal frame 110, and a user can perform command or text input by touching the display 120.

Fig. 2 is a side view showing a mobile device 200 according to another embodiment of the present invention. As shown in FIG. 2, when the mobile device 200 is operated in an open state, the mobile device 200 can function as a notebook computer. In this embodiment, the mobile device 200 can further include an external keyboard 210, and the external keyboard 210 can be coupled to the host system 130 and provide an input interface. In some embodiments, the external keyboard 210 can include a Wi-Fi module 220 for providing a small range of wireless communication functions. When the mobile device 200 is operated in the open state, the external keyboard 210, the host system 130, and the communication module 140 generally form a flat structure having an angle θ of approximately 90 degrees between the flat structure and the metal outer frame 110. The relatively upright display 120 and the external keyboard 210 allow a user to more easily perform typing and word processing.

In the preferred embodiment of the present invention, the mobile device 100/200 is a deformable communication device and can be used as a tablet computer or a notebook computer. When the mobile device 100/200 is used as a tablet computer, its antenna element will be very close to the metal plate 150 and the metal frame 110, so that the radiation field of the antenna element is dried. Disturb. In view of this, the present invention employs a loop antenna 170 instead of a general antenna to cover the 3G/4G mobile communication band. Since the loop antenna 170 is not easily affected by the ground plane and does not require a large clearance area, the mobile device 100/200 of the present invention can maintain good communication quality in the absence of an antenna headroom.

Figure 3 is a plan view showing a loop antenna 300 according to an embodiment of the present invention. As shown in FIG. 3, the loop antenna 300 includes a first radiating portion 310 and a second radiating portion 320. In general, the first radiating portion 310 can resonate to generate a low frequency band, and the second radiating portion 320 can resonate to generate a high frequency band. In some embodiments, the first radiating portion 310 is substantially rectangular and has a corner notch 316, wherein the corner notch 316 is substantially a small rectangle. An open slot 350 is formed in the first radiating portion 310. In some embodiments, the open slot 350 is generally an L-shape. The first radiating portion 310 has a feeding end 312 coupled to a signal source 390 and a grounding end 314 coupled to a ground potential GND. The open slot 350 is used to separate the feed end 312 from the ground end 314. In some embodiments, signal source 390 is a radio frequency module. The second radiating portion 320 is coupled to the ground end 314 of the first radiating portion 310. In some embodiments, the second radiating portion 320 is substantially an L-shape.

Fig. 4 is a plan view showing a loop antenna 400 according to another embodiment of the present invention. As shown in FIG. 4, the loop antenna 400 further includes a third radiating portion 330. In some embodiments, the third radiating portion 330 is substantially rectangular. The third radiating portion 330 is coupled to the first radiating portion 310, and the third radiating portion 330 has a length and a width smaller than the first radiating portion 310. The third radiating portion 330 can be used to control the impedance matching of the loop antenna 400 and increase the operating bandwidth of the loop antenna 400.

Figure 5 is a diagram showing a loopback day according to an embodiment of the present invention. Top view of line 500. In the present embodiment, one of the second radiating portions 520 of the loop antenna 500 is substantially an I-shape. The second radiating portion 520 is coupled to the ground end 314 of the first radiating portion 310 and extends away from the first radiating portion 310. It must be noted that the second radiating portion 520 may also have other shapes, such as a U-shape, an S-shape, or a J-shape, without affecting the radiation characteristics of the loop antenna 500. The loop antennas 300, 400, and 500 shown in Figures 3, 4, and 5 can be applied to the embodiments of Figures 1 and 2.

Figure 6 is a graph showing the Return Loss of a loop antenna according to an embodiment of the present invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the return loss (dB). As shown in FIG. 6, the loop antenna can excite a first frequency band FB1 and a second frequency band FB2. In the preferred embodiment, the first frequency band FB1 is between about 704 MHz and 960 MHz, and the second frequency band FB2 is between about 1710 MHz and 2170 MHz. Therefore, the loop antenna of the present invention can cover multiple frequency bands such as LTE Band 17/13, GSM850/900, LTE Band 4, GSM1800/1900, WCDMA2100, etc., and meets practical application requirements.

In some embodiments, the dimensions of the elements of the invention are as follows. Please refer to Figures 1 and 4 together. The distance D1 between the loop antenna 170 and the metal plate 150 is about 4.5 mm. The loop antenna 400 has an overall length of about 78 mm and an overall width of about 29 mm. The width of one of the open ends 351 of the open slot 350 is between about 0.5 mm and 2 mm.

It is to be noted that the above-described component sizes, component shapes, and frequency band ranges are not limitations of the present invention. Designers can adjust these component sizes, component shapes, and frequency bands to suit different needs.

As described above, the loop antenna of the present invention is not easily affected by the ground plane and does not require a large clearance area. With proper fine-tuning, this loop antenna will have a small antenna height and can be applied to various miniaturized mobile devices without a configuration of the antenna headroom.

The ordinal numbers in this specification and the scope of the patent application, such as "first", "second", "third", etc., have no sequential relationship with each other, and are only used to indicate that two are identical. Different components of the name.

The present invention has been described above with reference to the preferred embodiments thereof, and is not intended to limit the scope of the present invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧ mobile devices

110‧‧‧Metal frame

120‧‧‧ display

130‧‧‧Host system

140‧‧‧Communication Module

150‧‧‧Metal plate

160‧‧‧Non-conductor housing

170‧‧‧Circle antenna

180‧‧‧RF Module

D1‧‧‧ distance

E1‧‧‧Non-conductor outer surface

E2‧‧‧back surface of metal frame

Claims (12)

A mobile device comprising: a metal frame; a display disposed in the metal frame; a host system; and a communication module comprising: a metal plate; a non-conductor casing, wherein the metal plate and the non-conductor The outer casing forms a hollow structure; a loop antenna; and a radio frequency module coupled to the loop antenna and serving as a signal source of the loop antenna; wherein the loop antenna and the radio frequency module are disposed on the a hollow structure, both of which are attached to an inner surface of the non-conductor outer casing, the inner surface being opposite to the metal plate; and wherein the mobile device is operable in an open state or a collapsed state when operating in the hollow When in the state, the mobile device acts as a tablet, and the metal frame is laid flat on the host system and the communication module. The mobile device of claim 1, further comprising: an external keyboard, wherein when the mobile device is operated in the open state, the external keyboard is coupled to the host system; wherein when the mobile device is operated In the open state, the external keyboard, the host system, and the communication module generally form a flat structure, and the flat structure and the metal frame have an angle of approximately 90 degrees. The mobile device of claim 1, wherein the loop antenna comprises: a first radiating portion, wherein an open slot is formed in the first radiating portion, the first radiating portion has a coupling to the a feeding end of the RF module and a grounding end coupled to a ground potential, wherein the opening slot separates the feeding end from the grounding end; and a second radiating portion coupled to the first radiating portion The ground terminal. The mobile device of claim 3, wherein the first radiating portion is substantially rectangular and has a corner notch. The mobile device of claim 3, wherein the open slot is substantially L-shaped, and the open end of one of the open slots has a width of between about 0.5 mm and 2 mm. The mobile device of claim 3, wherein the second radiating portion is substantially an L-shape or an I-shape. The mobile device of claim 3, wherein the loop antenna further comprises: a third radiating portion coupled to the first radiating portion, wherein the third radiating portion has a length and a width smaller than the first portion a radiation department. A loop antenna includes: a first radiating portion, wherein an open slot is formed in the first radiating portion, the first radiating portion has a feeding end coupled to a signal source and coupled to a ground One of the potentials is grounded, and the open slot separates the feed end from the ground end; and a second radiating portion is coupled to the ground end of the first radiating portion. The loop antenna of claim 8, wherein the first radiating portion is substantially rectangular and has a corner notch. The loop antenna of claim 8, wherein the open slot is substantially L-shaped, and the open end of one of the open slots has a width of between about 0.5 mm and 2 mm. The loop antenna of claim 8, wherein the second radiating portion is substantially an L-shape or an I-shape. The loop antenna of claim 8, further comprising: a third radiating portion coupled to the first radiating portion, wherein the third radiating portion has a length and a width smaller than the first radiating portion.