TW201507265A - Mobile device - Google Patents

Abstract

A mobile device includes a dielectric substrate, a ground plane, a signal source, and an antenna structure. The antenna structure includes a radiation element and a parasitic element. A feeding branch of the radiation element is coupled to the signal source. A first radiation branch and a second radiation branch of the radiation element are both coupled to the feeding branch, and extend away from each other. The parasitic element is separate from the radiation element. A grounding branch of the parasitic element is coupled to the ground plane and disposed adjacent to the feeding branch. A first parasitic branch of the parasitic element is coupled to the grounding branch, and extends away from the radiation element. A second parasitic branch of the parasitic element is coupled to the first parasitic branch and disposed adjacent to the first radiation branch.

Description

Mobile device

The present invention relates to a mobile device, and more particularly to a mobile device and an antenna structure suitable for the LTE (Long Term Evolution) band.

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, and Some cover short-range wireless communication ranges, such as Wi-Fi, Bluetooth, and WiMAX (Worldwide Interoperability for Microwave Access) systems using 2.4 GHz, 3.5 GHz, 5.2 GHz, and 5.8 GHz bands for communication.

4G LTE is the next generation of mobile communication standards. Due to the different LTE bands used around the world, mobile devices that currently support LTE are usually divided into US and European versions, and the antennas of these two versions cannot be shared. For example, the US version of the antenna can only operate in the band up to 2170MHz, but cannot support the LTE Band 7 band in Europe, which increases the manufacturing cost and inventory cost of the mobile device.

In order to solve the foregoing problems, the present invention provides a mobile device comprising: a dielectric substrate; a ground plane disposed on the dielectric substrate, wherein the dielectric substrate further has a metal free clear region; a signal source; and an antenna structure. The antenna structure includes: a first radiating portion including a feeding branch, a first radiating branch, and a second radiating branch, wherein the feeding branch is Coupled to the signal source, the first radiation branch and the second radiation branch are coupled to the feed branch and extend away from each other; and a parasitic portion is separated from the first radiation portion And including a ground branch, a first parasitic branch, and a second parasitic branch, wherein the ground branch is coupled to the ground plane and adjacent to the feed branch, the first parasitic branch The grounding branch is coupled to the grounding branch and extends away from the first radiating portion, and the second parasitic branch is coupled to the first parasitic branch and adjacent to the first radiating branch.

100, 300, 400‧‧‧ mobile devices

110‧‧‧Media substrate

120‧‧‧ ground plane

121‧‧‧The edge of the ground plane

130‧‧‧No metal clearance area

140, 340, 440‧‧‧ antenna structure

150‧‧‧First Radiation Department

151‧‧‧Feed the branch

152‧‧‧First Radiation Branch

153‧‧‧Second Radiation Branch

160, 460‧‧‧ Parasitic

161‧‧‧ Grounding branch

162‧‧‧The first parasitic branch

163‧‧‧Second parasitic branch

190‧‧‧Signal source

370‧‧‧Second Radiation Department

464‧‧‧The third parasitic branch

FB1‧‧‧ first frequency band

FB2‧‧‧second frequency band

G1‧‧‧First coupling gap

G2‧‧‧Second coupling gap

1 is a schematic diagram showing a mobile device according to an embodiment of the present invention; FIG. 2A is a diagram showing a voltage standing wave ratio of an antenna structure of a mobile device according to an embodiment of the present invention; An antenna efficiency diagram of an antenna structure of a mobile device according to an embodiment of the invention; and a third diagram showing a mobile device according to an embodiment of the invention;

Figure 4 is a schematic diagram showing a mobile device 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 schematic diagram 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. 1 , the mobile device 100 includes at least a dielectric substrate 110 , a ground plane 120 , an antenna structure 140 , and a signal source 190 . The dielectric substrate 110 may be a structure in which a mechanism metal contains plastic. The ground plane 120 and the antenna structure 140 can be made of metal, such as silver, copper, aluminum, or iron. The antenna structure 140 can be substantially a planar structure and disposed on the metal free clear area of the dielectric substrate 110. The signal source 190 can be a radio frequency (RF) module for exciting the antenna structure 140. It should be noted that the mobile device 100 may further include other components, such as a processor, a touch panel, a touch module, a speaker, a battery, and a casing (not shown).

The ground plane 120 is disposed on the dielectric substrate 110. The dielectric substrate 110 further has a metal free clear area 130. In some embodiments, the metal free clear area 130 is adjacent to a corner of the dielectric substrate 110, and the metal free clear area 130 is substantially rectangular. The antenna structure 140 is disposed within the metal free clear area 130. The antenna structure 140 includes at least a first radiating portion 150 and a parasitic portion 160. The first radiating portion 150 includes a feeding branch 151, a first radiating branch 152, and a second radiating branch 153. The feed branch 151 is coupled to the signal source 190. Both the first radiating branch 152 and the second radiating branch 153 are coupled to the feeding branch 151 and extend toward each other away from each other. The first radiation branch 152 and the second radiation branch 153 each have an open end. In some embodiments, the first radiating portion 150 is substantially a T-shape or a Y-shape, wherein the feeding branch 151, the first radiating branch 152, and the second radiating branch 153 are each substantially straight. The parasitic portion 160 is separated from the first radiation portion 150. The parasitic portion 160 includes at least a ground branch 161, a first parasitic branch 162, and a second parasitic branch 163. The length of the first parasitic branch 162 is greater than the length of the ground branch 161 and greater than the length of the second parasitic branch 163. The grounding branch 161 is coupled to the ground plane 120 and adjacent to the feeding branch 151. The ground branch 161 has an open end. In some embodiments, the ground branch 161 is generally a straight strip. The ground branch 161 may be substantially perpendicular to one of the edges 121 of the ground plane 120 and substantially parallel to the feed branch 151. In some embodiments, a first coupling gap G1 is formed between the ground branch 161 and the feed branch 151, and the first coupling gap G1 is between about 0.3 mm and 1 mm. The first parasitic branch 162 is coupled to the ground branch 161 and extends away from the first radiating portion 150. The first parasitic branch 162 has an open end. In some embodiments, the first parasitic branch 162 includes an L-shaped portion and a U-shaped portion coupled to each other, wherein the L-shaped portion is directly coupled to the ground branch 161, and the U-shaped portion The portion includes the open end of the first parasitic branch 162. The second parasitic branch 163 is coupled to the first parasitic branch 162 and adjacent to the first radiating branch 152. The second parasitic branch 163 has an open end. In some embodiments, the second parasitic branch 163 is substantially straight strip. The second parasitic branch 163 can be substantially parallel At the first radiation branch 152. In some embodiments, a second coupling gap G2 is formed between the second parasitic branch 163 and the first radiation branch 152, and the second coupling gap G2 is between about 0.3 mm and 1 mm. The first coupling gap G1 and the second coupling gap G2 can be used to adjust the impedance matching of the antenna structure 140. It must be noted that the shapes of the first radiating portion 150 and the parasitic portion 160 are not limitations of the present invention. For example, any of the first radiating portion 150 and the parasitic portion 160 may further include a straight strip portion, a U-shaped portion, an L-shaped portion, an S-shaped portion, and an M-shaped portion. , a T-shaped part, or (and) a V-shaped part.

2A is a voltage standing wave radio (VSWR) diagram of the antenna structure 140 of the mobile device 100 according to an embodiment of the invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the operating frequency (MHz). Voltage standing wave ratio. As shown in FIG. 2A, the antenna structure 140 of the mobile device 100 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 2700 MHz.

Please refer to Figure 1, 2A together. The principle of operation of antenna structure 140 can be as follows. One of the first resonant paths formed by the first parasitic branch 162 can be excited to generate a first sub-band between about 704 MHz and 824 MHz. The second resonant path formed by the feeding branch 151, the first radiating branch 152, the second parasitic branch 163, and the L-shaped portion of the first parasitic branch 162 can generate a second sub-band. It is between about 824MHz and 960MHz. A third resonant path formed by the feed branch 151 and the first radiating branch 152 can excite a third sub-band that is between about 1710 MHz and 1850 MHz. a fourth resonant path formed by the feeding branch 151 and the second radiating branch 153 can be The excitation produces a fourth sub-band that is between approximately 1850 MHz and 2300 MHz. A fifth resonant path formed by the ground branch 161 can excite a fifth sub-band that is between about 2300 MHz and 2700 MHz.

2B is a diagram showing an antenna efficiency of an antenna structure 140 of a mobile device 100 according to an embodiment of the present invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the antenna efficiency (dB). As shown in FIG. 2B, the antenna structure 140 of the mobile device 100 can achieve an antenna efficiency of -3 dB or more in the first frequency band FB1 and the second frequency band FB2, which is suitable for practical applications.

The antenna structure 140 of the mobile device 100 of the present invention is substantially a planar structure. By utilizing the mutual coupling effect between the first radiating portion 150 and the parasitic portion 160, the overall size of the antenna structure 140 can be effectively reduced. According to the measurement results of FIG. 2, the antenna structure 140 can almost completely cover the 4G LTE frequency band used by countries all over the world. Thus, the mobile device 100 using the antenna structure 140 can be used anywhere in the world without having to be divided into different country versions. The invention has at least the advantages of cost reduction, space saving, and increased antenna bandwidth, and is very suitable for use in various miniaturized mobile devices.

Figure 3 is a schematic diagram showing a mobile device 300 in accordance with an embodiment of the present invention. Fig. 3 is similar to Fig. 1, so the following only describes the differences. In the embodiment of FIG. 3, an antenna structure 340 includes: a first radiating portion 150, a second radiating portion 370, and a parasitic portion 160, wherein the first radiating portion 150 and the parasitic portion 160 are in FIG. Elements of the same symbol have the same function and will not be described again. The second radiating portion 370 is coupled to the signal source 190. The second radiating portion 370 has an open end. In some embodiments, the second radiating portion 370 is substantially one Straight strip shape. The second radiating portion 370 may be substantially perpendicular to the feeding branch 151 and substantially parallel to the second radiating branch 153. When the antenna structure 340 is excited by the signal source 190, the second radiating portion 370 can generate a resonant mode near the frequency of 2100 MHz to increase the high frequency bandwidth of the antenna structure 340. The remaining features of the mobile device 300 of FIG. 3 are similar to those of the mobile device 100 of FIG. 1, so that the two embodiments can achieve similar operational effects.

Figure 4 is a schematic diagram showing a mobile device 400 in accordance with an embodiment of the present invention. Fig. 4 is similar to Fig. 1, so the following only describes the differences. In the embodiment of FIG. 4, an antenna structure 440 includes: a first radiating portion 150, a second radiating portion 370, and a parasitic element 460, wherein the first radiating portion 150 has the same reference numerals as in FIGS. The functions of the elements are the same, and the elements of the second radiation portion 370 having the same reference numerals as those of the third embodiment have the same functions, and therefore will not be described again. The parasitic portion 460 of the antenna structure 440 includes: a ground branch 161, a first parasitic branch 162, a second parasitic branch 163, and a third parasitic branch 464, wherein the third parasitic branch 464 is coupled. Connected to the first parasitic branch 162. The third parasitic branch 464 has an open end. In some embodiments, the third parasitic branch 464 is substantially straight strip. The third parasitic branch 464 can be substantially surrounded by the U-shaped portion of the first parasitic branch 162. Additionally, the third parasitic branch 464 and the second parasitic branch 163 may extend toward each other away from each other. When the antenna structure 440 is excited by the signal source 190, the L-shaped portion of the third parasitic branch 464 and the first parasitic branch 162 can collectively generate a resonant mode near the frequency of 1800 MHz to increase the height of the antenna structure 440. Frequently wide. The remaining features of the mobile device 400 of FIG. 4 are similar to those of the mobile device 100 of FIG. 1, so that the two embodiments can achieve similar operational effects.

It is to be noted that the above-described component sizes, component parameters, component shapes, and frequency ranges are not limitations of the present invention. The antenna designer can adjust these settings according to different needs. Further, the antenna structure of the present invention is not limited to the state illustrated in Figures 1-4. The invention may include only any one or more of the features of any one or a plurality of embodiments of Figures 1-4. In other words, not all illustrated features must be implemented simultaneously in the antenna structure of the present invention.

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‧‧‧Media substrate

120‧‧‧ ground plane

121‧‧‧The edge of the ground plane

130‧‧‧No metal clearance area

140‧‧‧Antenna structure

150‧‧‧First Radiation Department

151‧‧‧Feed the branch

152‧‧‧First Radiation Branch

153‧‧‧Second Radiation Branch

160‧‧‧ Parasitic

161‧‧‧ Grounding branch

162‧‧‧The first parasitic branch

163‧‧‧Second parasitic branch

190‧‧‧Signal source

G1‧‧‧First coupling gap

G2‧‧‧Second coupling gap

Claims (11)

A mobile device includes: a dielectric substrate; a ground plane disposed on the dielectric substrate, wherein the dielectric substrate further has a metal free clear region; a signal source; and an antenna structure disposed in the metal free clear region The antenna structure includes: a first radiating portion including a feeding branch, a first radiating branch, and a second radiating branch, wherein the feeding branch is coupled to the signal source, and The first radiation branch and the second radiation branch are both coupled to the feed branch and extend away from each other; and a parasitic portion is separated from the first radiation portion and includes a ground branch, a first parasitic branch, and a second parasitic branch, wherein the ground branch is coupled to the ground plane and adjacent to the feed branch, the first parasitic branch is coupled to the ground branch And extending away from the first radiating portion, and the second parasitic branch is coupled to the first parasitic branch and adjacent to the first radiating branch. The mobile device of claim 1, wherein the first radiating portion is substantially a T-shape, and wherein the feeding branch, the first radiating branch, and the second radiating branch are substantially Straight strip shape. The mobile device of claim 1, wherein the grounding branch is substantially a straight strip, and the grounding branch is substantially perpendicular to an edge of the grounding surface and substantially parallel to the feeding branch. The mobile device of claim 1, wherein a first coupling gap is formed between the grounding branch and the feeding branch, and the first coupling gap is between about 0.3 mm and 1 mm. The mobile device of claim 1, wherein the first parasitic branch comprises an L-shaped portion and a U-shaped portion coupled to each other. The mobile device of claim 1, wherein the second parasitic branch is substantially a straight strip and the second parasitic branch is substantially parallel to the first radiating branch. The mobile device of claim 1, wherein a second coupling gap is formed between the second parasitic branch and the first radiation branch, and the second coupling gap is between about 0.3 mm and 1 mm. between. The mobile device of claim 1, wherein the antenna structure further comprises a second radiating portion coupled to the signal source. The mobile device of claim 1, wherein the parasitic portion further includes a third parasitic branch coupled to the first parasitic branch, and the third parasitic branch And the second parasitic branch line extends in a direction away from each other. The mobile device of claim 9, wherein the third parasitic branch is substantially a straight strip, and the third parasitic branch is substantially surrounded by the first parasitic branch. The mobile device of claim 1, wherein the antenna structure is configured to generate a first frequency band and a second frequency band, the first frequency band being between about 704 MHz and 960 MHz, and the second frequency band is about At 1710MHz to Between 2700MHz.