CN103682583B - Mobile device - Google Patents

Abstract

The invention discloses a mobile device which comprises a metal machine component and a feed-in structure. The metal machine component is substantially a planar structure, wherein a slot is formed in the metal machine component. The feeding structure is substantially located in the slot and is coupled to a signal source. The metal machine component, the slot and the feed-in structure form an antenna structure, the metal machine component and the slot are regarded as a slot antenna, the slot antenna is excited to generate a low-frequency band, and the feed-in structure is excited to generate one or more high-frequency bands. The invention not only can effectively reduce the whole size of the antenna structure, but also can maintain good antenna radiation efficiency.

Description

mobile device

technical field

The present invention relates to a mobile device, in particular to a mobile device including an antenna structure.

Background technique

With the development of mobile communication technology, mobile devices have become increasingly common in recent years, such as laptop computers, mobile phones, tablet computers, multimedia players and other portable electronic devices with mixed functions. In order to meet people's needs, mobile devices generally have a wireless communication function. Some cover long-distance wireless communication ranges, for example: mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and their frequency bands of 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz and 2500MHz for communication, while some It covers short-distance wireless communication ranges, for example: Wi-Fi, Bluetooth and WiMAX (Worldwide Interoperability for Microwave Access) systems use frequency bands of 2.4GHz, 3.5GHz, 5.2GHz and 5.8GHz for communication.

In the prior art, a metal piece with a fixed size is often used as the antenna main body, and the length of the metal piece must be equal to a half wavelength or a quarter wavelength corresponding to a desired frequency band. Generally speaking, antennas corresponding to low frequency bands (such as GPS frequency bands) usually have a relatively large size, so it is not easy to design them in miniaturized mobile devices.

Contents of the invention

In view of the above problems, the present invention provides a mobile device, comprising: a metal mechanical component, which is generally a planar structure, wherein a slot is formed in the metal mechanical component; and a feed-in structure, which is generally located in the slot Inside, and coupled to a signal source, wherein the metal mechanical component, the slot, and the feeding structure form an antenna structure, the metal mechanical component and the slot are regarded as a slot antenna, the slot antenna Excitation produces a low frequency band and the feed structure excites one or more high frequency bands.

In the present invention, the metal mechanical component and its slot can be regarded as a slot antenna, which can excite a low frequency band. In addition, the feeding structure used to feed the slot antenna can excite one or more high frequency bands. This design method can not only effectively reduce the overall size of the antenna structure, but also maintain good antenna radiation efficiency. Therefore, the size of the mobile device can be further reduced.

Description of drawings

FIG. 1A is a top view showing a mobile device according to an embodiment of the present invention;

FIG. 1B is a perspective view showing a mobile device according to an embodiment of the present invention;

FIG. 2A is a top view showing a mobile device according to an embodiment of the present invention;

2B is a perspective view showing a mobile device according to an embodiment of the present invention;

FIG. 3A is a top view showing a mobile device according to an embodiment of the present invention;

3B is a perspective view showing a mobile device according to an embodiment of the present invention;

FIG. 4A is a top view showing a mobile device according to an embodiment of the present invention;

FIG. 4B is a perspective view showing a mobile device according to an embodiment of the present invention;

FIG. 5 is a graph showing the VSWR of the antenna structure according to an embodiment of the invention.

The reference numerals in the above-mentioned accompanying drawings are explained as follows:

100, 200, 300, 400～mobile device;

110, 410～metal mechanism components;

115, 415～Slot holes of metal mechanism components;

116～the narrower part of the slotted hole;

117～the wider part of the slotted hole;

130～feeding structure;

190～signal source;

220 ~ coaxial cable;

310～dielectric substrate;

FB1 ~ the first frequency band;

FB2 ~ the second frequency band;

FB3 ~ the third frequency band.

detailed description

In order to make the purpose, features and advantages of the present invention more comprehensible, specific embodiments of the present invention are listed below and described in detail with accompanying drawings.

FIG. 1A is a top view showing a mobile device 100 according to an embodiment of the invention. FIG. 1B is a perspective view showing a mobile device 100 according to an embodiment of the invention. The mobile device 100 can be a smart phone, a tablet computer, or a notebook computer. As shown in FIG. 1A and FIG. 1B , the mobile device 100 includes at least a metal mechanical component 110 and a feed-in structure 130 . More specifically, the metal mechanical component 110 is substantially a planar structure, and a slot 115 is formed in the metal mechanical component 110 . The feed-in structure 130 is roughly located inside the slot 115 and coupled to a signal source 190 . The feeding structure 130 can be made of conductive material, such as silver, copper, or aluminum. In some embodiments, the feeding structure 130 may be approximately rectangular, tapered, L-shaped, or even irregular. The metal mechanism 110 , the slot 115 , and the feeding structure 130 together form an antenna structure, and the antenna structure can cover multiple frequency bands.

The metal mechanism 110 may be part of a housing (not shown) of the mobile device 100 . In another embodiment, the metal mechanical component 110 may be a ground plane disposed on a system circuit board (not shown) of the mobile device 100 . It should be noted that the mobile device 100 may further include other necessary components, such as a processor, a touch panel, a speaker, and a battery (not shown).

In some embodiments, the metal mechanism 110 and the slot 115 can be excited to generate a low frequency band, while the feeding structure 130 can be excited to generate a high frequency band. In this embodiment, the slot hole 115 of the metal mechanical component 110 is roughly L-shaped. However, the present invention is not limited thereto, and the slot 115 may also be in other shapes (eg, rectangular, S-shaped, or irregular) to achieve impedance matching of the mobile device 100 . In some embodiments, the slot 115 includes a wider portion 117 and a narrower portion 116 , wherein the feedthrough 130 is located substantially within the wider portion 117 of the slot 115 .

In short, this embodiment utilizes an antenna slot (such as the slot 115) together with the metal mechanism component 110 and the feed-in structure 130 to form an antenna structure, which can cover the frequency band of the two-function antenna, wherein the metal mechanism The element 110 and the slot 115 can excite a low frequency band, while the feeding structure 130 can excite a high frequency band. In this way, the size of the overall mobile device can be reduced, the appearance requirements can be met, and better antenna characteristics can be obtained.

FIG. 2A is a top view showing a mobile device 200 according to an embodiment of the invention. FIG. 2B is a perspective view showing a mobile device 200 according to an embodiment of the invention. The mobile device 200 is similar to the mobile device 100 shown in FIGS. 1A and 1B . In this embodiment, the mobile device 200 further includes a coaxial cable 220 . The coaxial cable 220 is coupled between the feeding structure 130 and the signal source 190 . In more detail, a metal shell of the coaxial cable 220 is coupled to the metal mechanism 110 , and a central wire of the coaxial cable 220 is coupled to the feeding structure 130 to excite the antenna structure. In some embodiments, the coaxial cable 220 is roughly cylindrical, and can be bent into other shapes.

FIG. 3A is a top view showing a mobile device 300 according to an embodiment of the invention. FIG. 3B is a perspective view showing a mobile device 300 according to an embodiment of the invention. The mobile device 300 is similar to the mobile device 100 shown in FIGS. 1A and 1B . In this embodiment, the mobile device 300 further includes a dielectric substrate 310 (eg, an FR4 substrate), wherein the feeding structure 130 is disposed on the dielectric substrate 310 . In some embodiments, the feeding structure 130 may be a metal plane and printed on a surface of the dielectric substrate 310 . It should be noted that the dielectric substrate 310 may be located on a different plane from the metal mechanical component 110 . As long as a vertical projection of the feeding structure 130 does not overlap with any conductive material (for example, the vertical projection is roughly located within the slot 115 ), the antenna structure of the present invention can maintain good radiation efficiency.

FIG. 4A is a top view showing a mobile device 400 according to an embodiment of the invention. FIG. 4B is a perspective view showing a mobile device 400 according to an embodiment of the invention. The mobile device 400 is similar to the mobile device 300 shown in FIGS. 3A and 3B . In this embodiment, the slot hole 415 of the metal mechanical component 410 of the mobile device 400 is roughly a rectangle. In fact, regardless of the shape of the slot hole of the metal mechanical component, the mobile device and its antenna structure of the present invention can have similar performance.

FIG. 5 is a diagram showing a voltage standing wave ratio (Voltage Standing Wave Radio, VSWR) of the antenna structure according to an embodiment of the present invention, wherein the horizontal axis represents the operating frequency (MHz), and the vertical axis represents the VSWR. Please refer to FIG. 1A and FIG. 1B together. The metal mechanism 110 and the slot 115 can excite a first frequency band FB1 , and the feeding structure 130 can excite a second frequency band FB2 and a third frequency band FB3 . In a preferred embodiment, the first frequency band FB1 is approximately between 1570 MHz and 1580 MHz, the second frequency band FB2 is approximately between 2400 MHz and 2484 MHz, and the third frequency band FB3 is approximately between 5150 MHz and 5850 MHz. Therefore, the antenna structure of the present invention can roughly cover GPS (Global Positioning System) frequency bands and Wi-Fi frequency bands.

Please refer to FIG. 1A, FIG. 1B, FIG. 2A, and FIG. 2B. In one embodiment, the dimensions of the components of the mobile device 100 are as follows. The metal mechanical member 110 has a length of about 300 mm, a width of about 200 mm, and a thickness of about 1 mm. The overall length of the slot 115 (including the length of the narrower portion 116 and the length of the wider portion 117 ) is about 60 mm. The width of the wider portion 117 of the slot 115 is about 10 mm. The width of the narrower portion 116 of the slot 115 is about 5 mm. The length of the feeding structure 130 is about 40mm, and the width is about 8mm. The length of the coaxial cable 220 is about 200 mm, and the diameter of its circular cross section is about 1.6 mm.

It should be noted that the present invention is not limited thereto. The above-mentioned component sizes, component parameters, and frequency band ranges can all be adjusted by designers according to different requirements. In addition, due to similar design methods, the mobile devices and their antenna structures in various embodiments of the present invention can achieve similar operational effects after fine-tuning.

In the present invention, the metal mechanical component and its slot can be regarded as a slot antenna, which can excite a low frequency band. In addition, the feeding structure used to feed the slot antenna can excite one or more high frequency bands. This design method can not only effectively reduce the overall size of the antenna structure, but also maintain good antenna radiation efficiency. Therefore, the size of the mobile device can be further reduced.

It is worth noting that, to realize the idea of the present invention, the mobile device must consider the following conditions: the first is the material, and the mechanical components constituting the slot antenna must be good conductors (such as metal mechanical components); the second is the size, Because the resonance frequency of the slot antenna is mainly determined by the size of the slot itself, the size of the slot should be close to the relevant wavelength of the resonance frequency band, and this wavelength is determined by the resonance principle of the slot antenna (in this embodiment, we set Set to 60mm, close to one-half wavelength).

The ordinal numbers in this specification and claims, such as "first", "second", "third", etc., have no sequential relationship with each other, and are only used to mark and distinguish two terms with the same name. of different components.

Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the scope of the present invention. Anyone skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope defined by the appended claims.

Claims (10)

1. a mobile device, including:

One metal machine component, substantially one planar structure, wherein a closed type slotted eye is formed at this metal machine Within component；And

One feed-in structure, within wherein the upright projection of this feed-in structure is positioned at this slotted eye, and is coupled to one Signal source；

Wherein this metal machine component, this slotted eye, and this feed-in structure form an antenna structure, this metal Mechanism member and this slotted eye are i.e. considered as a slot antenna, and this slot antenna excites generation one low-frequency band, and is somebody's turn to do Feed-in structure excites one or more high frequency band of generation；

Wherein this mobile device is an intelligent mobile phone, a panel computer, or a notebook computer, and This metal machine component is a part for a shell of this mobile device.

2. mobile device as claimed in claim 1, also includes:

One coaxial wire, is coupled between this feed-in structure and this signal source.

3. mobile device as claimed in claim 1, also includes:

One medium substrate, wherein this feed-in structure is arranged on this medium substrate.

4. mobile device as claimed in claim 3, wherein this medium substrate is positioned at this metal machine component In Different Plane.

5. mobile device as claimed in claim 1, wherein this slotted eye substantially of this metal machine component L-shaped.

6. mobile device as claimed in claim 1, wherein this slotted eye substantially of this metal machine component Rectangle.

7. mobile device as claimed in claim 1, wherein this slotted eye of this metal machine component includes one relatively Wide portion and a narrower part, and within this feed-in structure is located substantially at this wider portion.

8. mobile device as claimed in claim 1, wherein this feed-in structure substantially rectangle.

9. mobile device as claimed in claim 1, wherein this metal machine component and this slotted eye excite generation One first frequency band, this first frequency band is about between 1570MHz and 1580MHz.

10. mobile device as claimed in claim 1, wherein this feed-in structure excites generation one second frequency Band and one the 3rd frequency band, this second frequency band about between 2400MHz and 2484MHz, and the 3rd Frequency band is about between 5150MHz and 5850MHz.