CN102683830A - Mobile communication device and antenna structure thereof - Google Patents

Abstract

The invention discloses a mobile communication device, which comprises an antenna structure, wherein the antenna structure is provided with a grounding element and an antenna element. The antenna element comprises an antenna ground plane, a radiation part and a short-circuit radiation part, wherein the antenna ground plane is electrically connected to the ground element. The radiation part comprises a signal feed-in point, a first radiation branch and a second radiation branch. The first radiation branch and the second radiation branch are both connected to the signal feed-in point, and the open ends of the first radiation branch and the second radiation branch extend towards the same direction. The first end of the short-circuit radiation part is electrically short-circuited to the antenna ground plane, the second end of the short-circuit radiation part is an opening end, a coupling space is arranged between a specific section of the short-circuit radiation part close to the first end of the short-circuit radiation part and the radiation part, and the short-circuit radiation part is coupled and excited by the radiation part through the coupling space to generate at least one resonance mode so as to increase the operation bandwidth of the antenna.

Description

Mobile communication device and its antenna structure

technical field

The invention relates to a mobile communication device and its antenna structure, in particular to a mobile communication device whose built-in antenna has shielding metal walls and multi-frequency operating frequency bands.

Background technique

With the rapid development of wireless communication technology, it has prompted the birth of Long Term Evolution (LTE, Long Term Evolution) mobile communication technology, which means that mobile communication device antennas will require lower operating frequencies and wider bandwidths. The required frequency bands include About 704~960MHz and 1710~2690MHz cover the tri-band operation of LTE700/2300/2500 and the five-band operation of WWAN (Wireless Wide Area Network). While portable communication devices demand thin, small and multi-frequency operation, the space for accommodating antennas is relatively reduced. Therefore, the miniaturization technology of built-in multi-frequency antennas in communication devices is very important; The number of components to be integrated in a communication device is relatively increased. Therefore, how to design a multi-frequency antenna with a shielded metal wall to effectively integrate various components in a mobile communication device is another important challenge for antenna design to meet the multi-frequency operation. .

Taiwan Patent Publication No. I327786 "An Electromagnetic Compatibility Built-in Multi-Frequency Serpentine Loop Antenna" discloses a method of achieving multi-frequency operation by means of a meandering loop radiator, and at the same time by integrating an antenna ground plane to achieve As a shielding metal wall concept, its operating frequency band can cover WWAN five-band operation, but its bandwidth still does not cover LTE/WWAN eight-band operation. At present, under the limited antenna space, it is necessary to meet the requirements of the current mobile communication device for LTE/WWAN eight-band operation, and at the same time reduce the influence of the integrated components in the mobile communication device on the antenna characteristics. The problem that must be solved under the miniaturization of multi-frequency antenna.

Contents of the invention

In order to solve the above problems in the prior art, the present invention proposes a mobile communication device and its antenna structure. The built-in antenna can not only cover the eight-band operation of LTE/WWAN, but also has a shielding metal wall, which can effectively integrate the communication device. various components.

The mobile communication device of the present invention includes an antenna structure, and the antenna structure has: a ground element and an antenna element, and the antenna element is arranged on one side of the ground element. The antenna element includes an antenna ground plane, a radiation portion and a short-circuit radiation portion, wherein the antenna ground plane is electrically connected to the ground element. The radiation part and the short-circuit radiation part are arranged on a dielectric substrate, wherein the radiation part includes a signal feeding point, a first radiation branch and a second radiation branch. The signal feed-in point is set at one end close to the ground element; and the first radiation branch and the second radiation branch are connected to the signal feed-in point, the first radiation branch and the second radiation branch The opening ends of the openings extend toward the same direction, and the first radiation branch and the second radiation branch provide at least two resonance paths with different lengths but the same extension direction, generating at least two resonance modes to increase the operating bandwidth of the antenna . The length of the short-circuit radiating portion is at least twice the shortest resonance path of the radiating portion, a first end of the short-circuit radiating portion is electrically short-circuited to the ground plane of the antenna, its second end is an open end, and the short-circuit radiating portion is close to its first end There is a coupling distance between the specific section at one end and the radiation part. Through the coupling distance, the short-circuit radiation part is coupled and excited by the radiation part to generate at least one resonant mode to increase the operating bandwidth of the antenna. Wherein, the antenna element is a three-dimensional structure, and the antenna ground plane and the radiation part are located on different planes of the three-dimensional structure.

The antenna structure of the present invention includes: a ground element and an antenna element, and the antenna element is arranged on one side of the ground element. The antenna element includes an antenna ground plane, a radiation portion and a short-circuit radiation portion, wherein the antenna ground plane is electrically connected to the ground element. The radiation part and the short-circuit radiation part are arranged on a dielectric substrate, wherein the radiation part includes a signal feeding point, a first radiation branch and a second radiation branch. The signal feed-in point is set at one end close to the ground element; and the first radiation branch and the second radiation branch are connected to the signal feed-in point, the first radiation branch and the second radiation branch The opening ends of the openings extend toward the same direction, and the first radiation branch and the second radiation branch provide at least two resonance paths with different lengths but the same extension direction, generating at least two resonance modes to increase the operating bandwidth of the antenna . The length of the short-circuit radiation part is at least twice the shortest resonance path of the radiation part, a first end of the short-circuit radiation part is electrically short-circuited to the ground plane of the antenna, and its second end is an open end, and the short-circuit radiation part is close to its first end There is a coupling distance between the specific section at one end and the radiation part. Through the coupling distance, the short-circuit radiation part is coupled and excited by the radiation part to generate at least one resonant mode to increase the operating bandwidth of the antenna. Wherein, the antenna element is a three-dimensional structure, and the antenna ground plane and the radiation part are located on different planes of the three-dimensional structure.

The multi-frequency antenna of the mobile communication device of the present invention uses its antenna grounding plane as a shielding metal wall, and the radiation part and the short-circuit radiation part have a strong current interval (that is, a weak electric field interval) to be arranged near the antenna grounding plane, so that the antenna is grounded. The multi-frequency characteristics of the facing antenna are largely unaffected, and at the same time, it is conducive to tight integration with adjacent components in the device. The multi-frequency antenna design mechanism mainly uses two radiating parts with different lengths but the same extension direction to generate two resonance modes with different center frequencies at high frequencies to cover most of the bandwidth of the second (high frequency) operating frequency band. At the same time, the radiating part can also be used as an energy source for coupling excitation of the short-circuiting radiating part. In addition, the extension direction of the radiation part is such that the opening end of the radiation part is far away from the ground plane of the antenna, and the short-circuit radiation part is excited by using a coupling distance between the short-circuit radiation part and the radiation part near the short-circuit end. The coupling distance is less than 3mm, and the short-circuit radiation The length of the radiation part is at least twice the shortest resonant path, mainly to enable it to couple the energy of the radiation part to the short-circuit radiation part, so as to effectively excite the short-circuit radiation part to generate the first (low frequency) operating frequency band sufficient to cover LTE700/ GSM850/900 (about 704 ~ 960MHz) triple frequency operation, and another high-order resonance mode is generated at high frequency, and combined with the resonance mode generated by the radiation part into the second (high frequency) operating frequency band, which is sufficient to cover GSM1800/1900/UMTS/LTE2300/2500 (approximately 1710-2690MHz) five-band operation achieves eight-band operation of LTE/WWAN, so that the mobile communication device can cover all current operating frequency bands of mobile communication. At the same time, the size of the multi-frequency antenna of the mobile communication device of the present invention is only about 3×15×35mm ³ , and it has a structure of a shielding metal wall, which is easy to integrate adjacent components and meets the actual application requirements.

Description of drawings

FIG. 1 is a structural diagram of a first embodiment of a mobile communication device and its antenna structure according to the present invention.

FIG. 2 is a measured return loss diagram of a first embodiment of a mobile communication device and its antenna structure according to the present invention.

FIG. 3 is a structural diagram of a second embodiment of a mobile communication device and its antenna structure according to the present invention.

FIG. 4 is a structural diagram of a third embodiment of a mobile communication device and its antenna structure according to the present invention.

Wherein, the reference signs are explained as follows:

1, 3, 4 Mobile Communication Devices

10, 30, 40 Grounding element

101, 301, 401 Main ground plane

102, 302, 402, 403 Protruding ground plane

20 antenna elements

11 Dielectric substrate

12, 32, 42 Antenna ground plane

121, 122, 123 Grounding point

13, 43 Radiation Department

131, 431 signal feed points

132 The first radial branch

133 The second radial branch

14 Short circuit radiation part

141 Short-circuit the first end of the radiating part

142 Short-circuit the second end of the radiating part

143 Short circuit point

144 Short-circuit the radiating portion to a specific section close to its first end

15 coupling spacing

21 First operating frequency band

22 Second operating frequency band

221, 222, 223 Resonant modes in the second operating frequency band

X, Y, Z coordinate axes

Detailed ways

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

Certain terms are used in the description and claims to refer to particular elements. It should be understood by those skilled in the art that hardware manufacturers may use different terms to refer to the same element. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. "Includes" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described that a first device is coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means. .

Please refer to FIG. 1 , which is a structural diagram of a first embodiment of a mobile communication device 1 and its antenna structure according to the present invention. As shown in FIG. 1 , the mobile communication device 1 includes an antenna structure including a ground element 10 and an antenna element 20 . In this embodiment, the ground element 10 includes a main ground plane 101 and a protruding ground plane 102, the protruding ground plane 102 is electrically connected to an edge of the main ground plane 101, and the protruding ground plane 102 is connected to the main ground plane 102. The ground 101 is in an L-shape, but this is just an example and not a limitation of the present invention.

The antenna element 20 is disposed on one side of the ground element 10 , and the antenna element 20 includes an antenna ground plane 12 , a radiation portion 13 and a ground radiation portion 14 . In this embodiment, the radiation portion 13 and the ground radiation portion 14 of the antenna element 20 are disposed on a dielectric substrate 11, and the antenna ground plane 12 is disposed on one side of the ground element 10, and the antenna ground plane 12 is formed by The two ground points 121 , 122 are electrically connected to the ground element 10 . It should be noted that the antenna element 20 is a three-dimensional structure, and the antenna ground plane 12 and the radiation portion 13 are located on different planes of the three-dimensional structure. The radiation part 13 includes a signal feeding point 131, a first radiation branch 132 and a second radiation branch 133, the signal feeding point 131 is arranged at one end close to the ground element 10, and the first radiation branch Both the path 132 and the second radiation branch 133 are connected to the signal feeding point 131 , and the opening ends of the first radiation branch 132 and the second radiation branch 133 extend towards the same direction. It should be noted that, in this embodiment, the extension direction of the first radiation branch 132 and the second radiation branch 133 of the radiation part 13 is such that the first radiation branch 132 and the second radiation branch 133 is far away from the antenna ground plane 12; in addition, a first length of the first radiation branch 132 is shorter than a second length of the second radiation branch 133, in other words, the radiation part 13 provides at least two The resonant paths with different lengths but the same extension direction generate at least two resonant modes to increase the operating bandwidth of the antenna.

In addition, the short-circuit radiation portion 14 is also disposed on the dielectric substrate 11, and a first end 141 of the short-circuit radiation portion 14 can be electrically short-circuited to the antenna ground plane 12 through a short-circuit point 143, and a second end 142 of the short-circuit radiation portion 14 can be electrically short-circuited to the antenna ground plane 12 is an open end. In this embodiment, the short-circuit radiating portion 14 may have multiple (more than two) bends for size reduction, and its length is at least twice the shortest resonance path of the radiating portion 13. In other words, the short-circuit radiating portion 14 The length of the portion 14 is at least twice the first length of the first radiating branch 132 . It should be noted that there is a coupling distance 15 between a specific section 144 of the short-circuit radiation part 14 close to the first end 141 and the radiation part 13. Through the coupling distance 15, the short-circuit radiation part 14 is coupled and excited by the radiation part 13 to At least one resonance mode is generated to increase the operating bandwidth of the antenna, wherein the coupling distance 15 is less than 3mm.

Please note again that in the first embodiment, the antenna element 20 and the ground element 10 of the antenna structure are located on different planes in the three-dimensional space. For example, the radiation portion 13 and the ground radiation portion 14 of the antenna element 20 are located on a first plane (XY plane as shown in FIG. 1 ), and the antenna ground plane 12 is located on a plane perpendicular to the first plane. On a second plane (the YZ plane shown in FIG. 1 ), and the main ground plane 101 and the protruding ground plane 102 of the ground element 10 are located on a plane parallel to the first plane and perpendicular to the second plane. On the third plane (another XY plane as shown in Figure 1).

Please refer to FIG. 2 together. FIG. 2 is a measured return loss diagram of a mobile communication device according to a first embodiment of the present invention. In this embodiment, the length of the dielectric substrate 11 is selected to be about 35 mm, the width is about 15 mm, and the height is about 3 mm; the length of the main ground plane 101 is about 100 mm, and the width is about 60 mm; about 25mm; the radiation part 13 and the short-circuit radiation part 14 are formed on the dielectric substrate 11, wherein the radiation part 13 has a first radiation branch 132 and a second radiation branch 133, which provide two resonance paths, which resonate at high frequencies respectively. Two modes 222, 223; the length of the short-circuit radiation portion 14 is about 100 mm, and there is a distance of about 1 mm between the specific section 144 of the short-circuit radiation portion 14 near its first end 141 (that is, the short-circuit end) and the radiation portion 13. The coupling distance 15 can excite a resonant mode at low frequency to form a first operating frequency band 21 of the antenna element 20, and excite its double frequency mode 221 at high frequency, so that it is compatible with the two excited by the radiation part 13. The modes 222 , 223 combine at high frequencies into a second operating frequency band 22 of the antenna element 20 . According to the experimental results, under the general requirement of 6dB return loss definition, the bandwidth of the first operating frequency band 21 can cover the three-band operation of LTE700/GSM850/900 (about 704-960MHz), and the modes 221, 222 and The bandwidth of the second operating frequency band 22 formed by 223 can cover the five-band operation of GSM1800/GSM1900/UMTS/LTE2300/LTE2500 (about 1710-2690MHz), so the antenna can meet the eight-band operation requirements of LTE/WWAN.

Next, please refer to FIG. 3 , which is a structural diagram of a second embodiment of a mobile communication device 3 and its antenna structure according to the present invention. The structure of the mobile communication device 3 of the second embodiment is basically similar to the mobile communication device 1 of the first embodiment, the difference between the two is that the antenna ground plane 32 of the mobile communication device 3 of FIG. 3 includes a first antenna element The ground plane 321 and a second antenna sub-ground plane 322 are respectively located on two adjacent sides of the antenna element 20, and are electrically short-circuited to the ground element 30 through the short-circuit points 121, 122 and 123. In addition, the ground of the mobile communication device 3 The element 30 is composed of a main ground plane 301 and a protruding ground plane 302, and the main ground plane 301 and the protruding ground plane 302 are substantially in a convex shape, and the protruding ground plane 302 is electrically connected to the main ground plane 301 an edge. Because the structure of the mobile communication device 3 of the second embodiment is similar to that of the mobile communication device 1 of the first embodiment, it can also achieve similar effects as the mobile communication device 1 of the first embodiment, and can also produce the same effect as the mobile communication device 1 of the first embodiment. 1 Similar two bands of wideband operation, covering eight-band operation for LTE/WWAN.

Next, please refer to FIG. 4 , which is a structural diagram of a third embodiment of a mobile communication device 4 according to the present invention. The structure of the mobile communication device 4 of the third embodiment is basically similar to the mobile communication device 1 of the first embodiment, the difference between the two is that the antenna ground plane 42 of the mobile communication device 4 of FIG. 4 includes a first antenna element The ground plane 421 and a second antenna sub-ground plane 422 are located on two adjacent sides of the antenna element 20 respectively, and are electrically short-circuited to the ground element 40 through the short-circuit points 121, 122 and 123. In addition, the ground of the mobile communication device 4 The device 40 is composed of a main ground plane 401 and two protruding ground planes 402 and 403 , and the two protruding ground planes 402 and 403 are electrically connected to an edge of the main ground plane 401 . It should be noted that the radiation part 43 is roughly extended by the antenna ground plane 42 and the signal feeding point 431 of the radiation part 43 is finely adjusted. Since the mobile communication device 4 of the third embodiment has a similar structure to the radiation part of the mobile communication device 1 of the first embodiment, two resonant modes with different center frequencies can also be resonated, and the structure of the short-circuit radiation part is the same, so the first embodiment The mobile communication device 4 of the third embodiment can also achieve similar effects to the mobile communication device 1 of the first embodiment, and can also generate two broadband operating frequency bands similar to the first embodiment 1, covering eight-band operation of LTE/WWAN .

Please note again that in the above-mentioned embodiments, the protruding ground plane 102, 302, 402 can also be used to place a data transmission component for external signal transmission with the mobile communication device 1, 3, 4 to provide the mobile communication A signal transmission interface between the devices 1, 3, 4 and an external device. The above-mentioned external signal transmission element can be implemented by a universal serial bus (USB, universal serialbus) connector element, but this is not a limitation of the present invention. Wherein, the data transmission element can be disposed on the same side as the antenna element 20 , or the data transmission element can be disposed on the other side relative to the antenna element 20 , all of which belong to the scope of the present invention.

Undoubtedly, those skilled in the art should be able to understand that without departing from the spirit of the present invention, various changes of the mobile communication device and its antenna structure mentioned in FIG. 1, FIG. 3 and FIG. It works. In addition, the number of bends of the radiation part and the short-circuit line is not limited, and the bending direction, angle and shape of each bend are not the limiting conditions of this creation.

The above-mentioned embodiments are only used to illustrate the technical features of the present invention, and are not intended to limit the scope of the present invention. To sum up the above, a mobile communication device and its antenna structure of the present invention has an antenna that can generate two broadband operating frequency bands. The antenna has a simple structure and has a shielding metal wall, which can effectively integrate various components in the communication device components, and the two operating frequency bands of the antenna can respectively cover the triple-band operation of LTE700/GSM850/900 (about 704-960MHz) and the five-band operation of GSM1800/1900/UMTS/LTE2300/2500 (about 1710-2690MHz), covering All current mobile communication frequency bands.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (18)

1. a mobile communications device comprises an antenna structure, and this antenna structure comprises:

One earth element; And

One antenna element, this antenna element are arranged at a side of this earth element, and this antenna element comprises:

One antenna ground face, this antenna ground face is electrically connected to this earth element;

One Department of Radiation is arranged on the medium substrate, and this Department of Radiation comprises:

One signal feed-in point is arranged at the end near this earth element; And

One first radiation branch road and one second radiation branch road, this first radiation branch road and this second radiation branch road all are connected to this signal feed-in point, and the openend of this first radiation branch road and this second radiation branch road extends towards equidirectional; And

One short circuit Department of Radiation; Be arranged on this medium substrate, one first end of this short circuit Department of Radiation electrically is short-circuited to this antenna ground face, and one of which second end is an openend; This short circuit Department of Radiation is near having a coupling spacing between a particular section of this first end and this Department of Radiation; Via this coupling spacing, this short circuit Department of Radiation is excited by this Department of Radiation coupling, produces at least one resonance mode to increase the operation frequency range of this antenna;

Wherein, this antenna element is a stereochemical structure, and this antenna ground face and this Department of Radiation are positioned on the Different Plane of this stereochemical structure.

2. mobile communications device as claimed in claim 1 is characterized in that, this earth element has a main ground plane and at least one outstanding ground plane, and this outstanding ground plane is electrically connected to the one edge of this main ground plane, and should give prominence to ground plane near this antenna ground face.

3. mobile communications device as claimed in claim 2 is characterized in that, this at least one outstanding ground plane is used to put a data transmission element of transmitting with this mobile communications device external signal.

4. mobile communications device as claimed in claim 1 is characterized in that, this coupling spacing is less than 3mm.

5. mobile communications device as claimed in claim 1 is characterized in that, this antenna ground bread contains sub-ground plane of one first antenna and the sub-ground plane of one second antenna, lays respectively at two adjacent side of this antenna element.

6. mobile communications device as claimed in claim 1 is characterized in that, the bearing of trend of this of this Department of Radiation first radiation branch road and this second radiation branch road is to make the openend of this first radiation branch road and this second radiation branch road away from this antenna ground face.

7. mobile communications device as claimed in claim 1; It is characterized in that; One first length of this first radiation branch road is less than one second length of this second radiation branch road; And this first radiation branch road provides two different lengths but the identical resonance path of bearing of trend with this second radiation branch road, increases the operation frequency range of antenna to produce at least two resonance modes.

8. mobile communications device as claimed in claim 7 is characterized in that, the length of this short circuit Department of Radiation is at least the twice of this first length of this first radiation branch road.

9. mobile communications device as claimed in claim 1 is characterized in that, this short circuit Department of Radiation has a plurality of bendings.

10. mobile communications device as claimed in claim 1; It is characterized in that; This Department of Radiation of this antenna element and this ground connection Department of Radiation are positioned on one first plane; This antenna ground face is positioned on one second plane perpendicular to this first plane, and this earth element is positioned at and is parallel on this first plane and one the 3rd plane perpendicular to this second plane.

11. an antenna structure comprises:

One earth element; And

One antenna element, this antenna element are arranged at a side of this earth element, and this antenna element comprises:

One antenna ground face, this antenna ground face is electrically connected to this earth element;

One Department of Radiation is arranged on the medium substrate, and this Department of Radiation comprises:

One signal feed-in point is arranged at the end near this earth element; And

One first radiation branch road and one second radiation branch road, this first radiation branch road and this second radiation branch road all are connected to this signal feed-in point, and the openend of this first radiation branch road and this second radiation branch road extends towards equidirectional; And

One short circuit Department of Radiation; Be arranged on this medium substrate, one first end of this short circuit Department of Radiation electrically is short-circuited to this antenna ground face, and one of which second end is an openend; This short circuit Department of Radiation is near having a coupling spacing between a particular section of this first end and this Department of Radiation; Via this coupling spacing, this short circuit Department of Radiation is excited by this Department of Radiation coupling, produces at least one resonance mode to increase the operation frequency range of this antenna;

Wherein, this antenna element is a stereochemical structure, and this antenna ground face and this Department of Radiation are positioned on the Different Plane of this stereochemical structure.

12. antenna structure as claimed in claim 11 is characterized in that, this earth element has a main ground plane and at least one outstanding ground plane, and this outstanding ground plane is electrically connected to the one edge of this main ground plane, and should give prominence to ground plane near this antenna ground face.

13. antenna structure as claimed in claim 11 is characterized in that, this coupling spacing is less than 3mm.

14. antenna structure as claimed in claim 11 is characterized in that, this antenna ground bread contains sub-ground plane of one first antenna and the sub-ground plane of one second antenna, lays respectively at two adjacent side of this antenna element.

15. antenna structure as claimed in claim 11 is characterized in that, the bearing of trend of this of this Department of Radiation first radiation branch road and this second radiation branch road is to make the openend of this first radiation branch road and this second radiation branch road away from this antenna ground face.

16. antenna structure as claimed in claim 11; It is characterized in that; One first length of this first radiation branch road is less than one second length of this second radiation branch road; And this first radiation branch road provides two different lengths but the identical resonance path of bearing of trend with this second radiation branch road, increases the operation frequency range of antenna to produce at least two resonance modes.

17. antenna structure as claimed in claim 16 is characterized in that, the length of this short circuit Department of Radiation is at least the twice of this first length of this first radiation branch road.

18. antenna structure as claimed in claim 11; It is characterized in that; This Department of Radiation of this antenna element and this ground connection Department of Radiation are positioned on one first plane; This antenna ground face is positioned on one second plane perpendicular to this first plane, and this earth element is positioned at and is parallel on this first plane and one the 3rd plane perpendicular to this second plane.

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