WO2014106490A1

WO2014106490A1 - Loop antenna and related electronic apparatus

Info

Publication number: WO2014106490A1
Application number: PCT/CN2014/070200
Authority: WO
Inventors: 薛亮; 王汉阳; 尤佳庆; 杨小丽
Original assignee: 华为终端有限公司
Priority date: 2013-01-07
Filing date: 2014-01-07
Publication date: 2014-07-10
Also published as: CN103094690B; CN103094690A

Abstract

Disclosed are a loop antenna and a related electronic apparatus which can effectively broaden the high frequency bandwidth and improve the agility of antenna routing and the adjustability of the antenna. The embodiments of the present invention include: a feed point of a positive antenna and a feed point of a grounding antenna, wherein the feed point of the positive antenna or the feed point of the grounding antenna is connected with a monopole antenna; the feed point of the positive antenna is connected with a first conductive component, and is connected with the feed point of the grounding antenna via the first conductive component, wherein the first conductive component is a part of the periphery conductive frame of the electronic apparatus having the loop antenna.

Description

Loop antenna and related electronic equipment

The present application claims priority to Chinese Patent Application No. 201310005163.4, entitled "A Loop Antenna and Related Electronic Devices", filed on January 7, 2013, the entire contents of which is incorporated herein by reference. in. Technical field

The present invention relates to the field of communications technologies, and in particular, to a loop antenna and related electronic equipment. Background technique

The antennas of the original handheld communication devices (such as mobile phones, tablets, etc.) only support the global mobile communication system (GSM) system. With the development of communication device technology and in order to adapt to the multi-network system, At present, by increasing the number of antennas of handheld communication devices, the handheld communication device can simultaneously support various network standards such as third generation mobile communication technology (3G, 3rd-generation), 4G, wireless fidelity, global positioning system, and the like.

Taking mobile phones as an example, it is now common to have 4 to 6 or even more antennas for a smartphone. At the same time, consumer demand for a small, thin form factor for mobile phones has been increasing, and manufacturers have been working to improve antenna design with a compact structure. Recently, according to statistics, consumers are more inclined to metal structures (such as metal frames and metal back covers), so manufacturers use metal frames for antennas, and the antennas that connect the boards are made around the phone. The loop antenna, the metal loop antenna is not really closed, but has a slit to prevent short circuit; the antenna feed point of the metal loop antenna is connected to the vicinity of the metal frame slit, and the metal frame is used to form a path to the ground plane. The resonance mode of the loop antenna (such as modes of 0.5 wavelength λ, λ, and 1.5λ) is used to generate high and low frequency resonances of the desired frequency bands, respectively.

However, the loop antenna of the metal frame structure is fixed and simple, and the adjustability is weak. It is difficult to excite a plurality of high frequency resonances by the metal frame of the antenna feed point to the ground plane, which is easy to cause high The frequency bandwidth is insufficient, and the metal frame acts as an antenna radiator. The maximum electric field of the high and low frequency resonances is on the metal frame, and the metal frame slit is disposed at the left and right borders, which is likely to cause serious deterioration of the antenna performance when the hand is held. Summary of the invention The embodiment of the invention provides a loop antenna and related electronic equipment, which effectively widens the high frequency bandwidth, improves the flexibility of the antenna trace and adjusts the antenna.

In view of this, the first aspect of the present invention provides a loop antenna, which may include:

Positive antenna feed point and ground antenna feed point;

Wherein the positive antenna feeding point or the grounding antenna feeding point is connected with a monopole antenna; the positive antenna feeding point is connected to the first conductive component, and the grounding is connected by the first conductive component An antenna feed point, the first conductive member being part of a conductive bezel at the periphery of the electronic device having the loop antenna.

In a first possible implementation, a first passive device or a first active device is disposed between the first conductive component and the grounding antenna feed point.

In conjunction with the first possible implementation of the first aspect, in a second possible implementation, the first passive device is an inductor or a capacitor or a resistor, and the first active device is a switch or a varactor .

A second aspect of the present invention provides an electronic device, which can include a conductive bezel, a circuit board, and the loop antenna described in the first aspect;

The grounding antenna feeding point of the loop antenna is formed integrally with the grounding area on the circuit board; the conductive frame includes a first conductive frame member and a second conductive frame member, the first conductive frame member and the A first gap is left between the second conductive frame members, and the first slot is disposed near the loop antenna, so that the first conductive frame member and the second conductive frame member are coupled to excite resonance.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner, the electronic device is provided with a frame grounding point, the conductive frame is connected to the frame grounding point, and the grounding area is Form a ground connection.

In conjunction with the second possible implementation of the second aspect, in a third possible implementation, a second passive device or a second active device is disposed between the bezel ground point and the conductive bezel.

In conjunction with the third possible implementation of the second aspect, in a fourth possible implementation, the second passive device is an inductor or a capacitor or a resistor, and the second active device is a switch or a varactor .

With reference to the second aspect or the first or the second or the third possible implementation manner of the second aspect, in a fourth possible implementation manner, the conductive frame is electrically conductive formed of a metal material of stainless steel or aluminum frame. In conjunction with the second aspect or the first or second or third possible implementation of the second aspect, in a fifth possible implementation, the electronic device is a mobile communication terminal, a notebook computer, and a tablet computer.

As can be seen from the above technical solution, a loop antenna and related electronic device provided by the embodiment of the present invention, the positive antenna feeding point is connected with the first conductive component (part of the conductive frame), and then connected through the grounding antenna feeding point. Returning to the grounding area, and connecting a monopole antenna at the positive antenna feeding point or the grounding antenna feeding point to form a loop antenna; the monopole antenna is used to excite new high frequency resonance, effectively widening the high frequency bandwidth, and improving The flexibility of the antenna routing; Since the monopole antenna routing does not use the conductive frame as the radiator, the impact of the hand can be reduced, and the adjustability of the antenna can be improved. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description of the embodiments will be briefly described. It is obvious that the drawings in the following description are only some embodiments of the present invention. One of ordinary skill in the art can also obtain other drawings based on these drawings without undue creative effort.

1 is a schematic structural diagram of a loop antenna according to an embodiment of the present invention;

2 is another schematic structural diagram of a loop antenna according to an embodiment of the present invention;

3 is another schematic structural diagram of a loop antenna according to an embodiment of the present invention;

4 is another schematic structural diagram of a loop antenna according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of an electronic device with a loop antenna according to an embodiment of the present invention; FIG.

FIG. 6 is another schematic diagram of an electronic device with a loop antenna according to an embodiment of the present invention; FIG. 7 is another schematic diagram of an electronic device with a loop antenna according to an embodiment of the present invention. detailed description

The embodiment of the invention provides a loop antenna and related electronic equipment, which effectively widens the high frequency bandwidth, improves the flexibility of the antenna trace and adjusts the antenna. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, one of ordinary skill in the art does not create All other embodiments obtained under the premise of sexual labor are within the scope of protection of the present invention. The details are described below separately.

Referring to FIG. 1 , FIG. 1 is a schematic structural diagram of a loop antenna according to an embodiment of the present invention. The loop antenna includes:

a positive antenna feeding point 1 and a grounding antenna feeding point 2; wherein the positive antenna feeding point 1 or the grounding antenna feeding point 2 is connected with a monopole antenna 3, the positive antenna feeding point 1 and the a conductive member 41 is connected, and the grounding antenna feeding point is connected by the first conductive member 41, the first conductive member 41 is a part of the conductive frame 4 of the periphery of the electronic device having the loop antenna; In an embodiment, the positive antenna feeding point 1 may be disposed on the first conductive member 41, that is, directly connected to the first conductive member 41, or may be connected to the first conductive member 41 through a wire; likewise, the grounding The antenna feed point 2 may be disposed on the first conductive member 41, that is, directly connected to the first conductive member 41, or may be connected to the first conductive member 41 through a wire. In FIG. 1, only the positive antenna feed point 1 passes through the wire. The first conductive member 41 is connected to the first conductive member 41, and the first conductive member 41 is connected to the ground antenna feed point by wire as an example, but is not specifically limited to the present invention. It can be understood that the positive antenna feeding point 1 and the grounding antenna feeding point 2 are both strong current positions of the loop antenna; at the strong current position, a monopole antenna 3 is connected, wherein, vertical An antenna with a quarter wavelength (1/4 λ) is called a monopole antenna. In this embodiment, the monopole antenna 3 can excite a new resonance to expand the bandwidth, and the antenna resonance principle can be equivalent to the resonance principle of the symmetric array antenna. The symmetric array antenna has two arms, and the length of each arm is its radiation. The received signal frequency corresponds to 1/4 of the wavelength. Similarly, in this embodiment, one arm is the main board, and the other arm is the monopole antenna, so at the positive antenna feed point 1 or the ground antenna feed point 2 A length of wire can excite the resonance of the corresponding frequency. Moreover, the monopole antenna 3 is disposed inside the conductive frame 4, that is, the trace does not use the conductive frame 4 as a radiator, which can reduce the impact of the hand; as shown in FIG. 1, the monopole antenna 3 and the positive antenna feed point 1 connected, the positive antenna feed point 1 is connected to the first conductive member 41 through the first segment trace 11, wherein the first conductive member 41 is a part of the conductive frame 4 on the periphery of the electronic device, and the first conductive member 41 For an uninterrupted frame, that is, no gap or slit is provided on the first conductive member 41, along the first conductive member 41, and finally passed The second segment of the trace 12 is connected to the grounding antenna feed point 2 to form the loop antenna; for ease of understanding, the loop antenna formed by the thick line is shown in FIG. 1; wherein the ground antenna feed point 2 can be connected back The grounding region is connected to form a grounding region, and the grounding region may be a grounding region on a circuit board of the electronic device having the loop antenna. It is also conceivable that in the embodiment, only the first conductive component 41 is used as the periphery of the electronic device. The upper right corner portion of the conductive bezel 4 is illustrated as a schematic illustration, and is not intended to limit the present invention; that is, the first conductive member 41 may also be a top left corner or a lower right corner portion of the conductive bezel 4 on the periphery of the electronic device, etc. The function implementation does not affect. In addition, when the loop antenna is applied to an electronic device, a first slit 6 is left in the vicinity of the conductive frame 4 and the loop antenna, so that the loop antenna can be constructed and realize its function. A loop antenna provided by an embodiment of the present invention, a positive antenna feed point 1 and a first conductive member 41

(a part of the conductive frame 4) is connected, and then connected to the grounding area through the grounding antenna feeding point 2, and the monopole antenna 3 is connected at the positive antenna feeding point 1 or the grounding antenna feeding point 2, thereby forming Loop antenna; Monopole antenna 3 is used to excite new high-frequency resonance, effectively widen the high-frequency bandwidth, and improve the flexibility of the antenna trace; Since the monopole antenna 3 does not use the conductive frame 4 as a radiator, the hand grip can be reduced. Affect, and improve the adjustability of the antenna.

In some embodiments, as shown in FIG. 2, FIG. 2 is another schematic structural diagram of a loop antenna according to an embodiment of the present invention. The positive antenna feed point 1 is connected to the first conductive through the first segment trace 11. On the component 41, the first conductive component 41 is a part of the conductive frame 4 on the periphery of the electronic device, and the first conductive component 41 is an uninterrupted frame, that is, the first conductive component 41 is not provided with a slit or a slit. Along the first conductive member 41, finally connected to the grounding antenna feed point 2 through the second segment trace 12 and the monopole antenna 3 is disposed at the ground antenna feed point 2, thereby forming the loop antenna for convenience It is understood that the loop antenna formed by thick lines is shown in FIG. 2; wherein the ground antenna feed point 2 can be connected back to the ground area to form a ground connection, and the ground area can be on the circuit board of the electronic device having the loop antenna. The first conductive member 41 is also a frame of the upper left corner or the lower right corner of the conductive frame 4 on the periphery of the electronic device, and is not specifically limited herein.

Further, in the loop antenna, a first passive device or a first active device 5 may be disposed between the first conductive member 41 and the grounding antenna feeding point 2, and may refer to FIG. 3 and FIG. 4, it can be understood that the first passive device or the first active device 5 is disposed on the second segment of the trace 12, wherein FIG. 3 shows that the monopole antenna 3 is connected to the positive antenna feed point 1 and is provided with First passive device or first The loop antenna of the active device 5, FIG. 4 is a loop antenna of the monopole antenna 3 connected to the ground antenna feed point 2, and is provided with a first passive device or a first active device 5; wherein, according to different application scenarios The value of the first passive device or the first active device 5 may be different. The electrical length of the loop antenna may be adjusted by changing the value of the first passive device or the first active device 5, and the antenna is increased. Adjustability. It can also be understood that the first passive device 5 can be an inductor or a capacitor or a resistor or other passive device, and the first active device 5 can be a switch or a varactor or other active device. There is no specific limit. A loop antenna provided by an embodiment of the present invention, the positive antenna feeding point 1 is connected to the first conductive member 41 (a part of the conductive frame 4), and then connected to the grounding area through the grounding antenna feeding point 2, and is in the positive antenna A feed point 1 or a grounded antenna feed point 2 is connected with a monopole antenna 3 to form a loop antenna; a monopole antenna 3 is used to excite a new high frequency resonance, effectively widening the high frequency bandwidth, and improving the antenna trace Flexibility; since the monopole antenna 3 trace does not utilize the conductive bezel 4 as a radiator, the influence of the grip can be reduced, and the adjustability of the antenna can be improved; further, at the first conductive member 41 and the grounding antenna feed point 2 The first passive device or the first active device 5 is disposed therebetween, and the electrical length of the loop antenna can be adjusted by changing the value of the first passive device or the first active device 5, which increases the adjustability of the antenna. In order to facilitate the implementation of the technical solutions of the embodiments of the present invention, the embodiments of the present invention further provide device devices related thereto. The embodiment of the present invention further provides an electronic device. Referring to FIG. 5, FIG. 5 is a schematic diagram showing the structure of the electronic device, wherein the electronic device includes a conductive frame 4, a circuit board, and a loop antenna as described in the above embodiment. The grounding antenna feed point 2 of the loop antenna is connected to the grounding area on the circuit board;

The conductive frame includes a first conductive frame member 42 and a second conductive frame member 43. A first gap 6 is left between the first conductive frame member 42 and the second conductive frame member 43, and the first The slit 6 is disposed near the loop antenna such that the first conductive frame member 42 and the second conductive frame member 43 on both sides of the first slit 6 are coupled to excite the resonance. It is to be understood that, in the embodiment of the present invention, the first slot 6 is disposed near the loop antenna, wherein the location of the first slot 6 may be different in different practical application scenarios, but The first slot 6 is disposed in the vicinity of the loop antenna, so that the conductive frame members on both sides of the first slot 6 (ie, the first conductive frame member 42 and the second conductive frame member 43) are coupled to excite and resonate, which is not the first embodiment of the present invention. The specific setting position of a slit 6 is defined. The loop antenna in the electronic device shown in FIG. 5 is only illustrated by the connection of the monopole antenna 3 and the positive antenna feed point 1. The loop antenna in the electronic device can be combined according to the above embodiment. The loop antenna shown in FIG. 1 to FIG. 4 is specifically implemented, and will not be specifically described herein. In conjunction with the electronic device shown in FIG. 5, the loop antenna is disposed at an upper right corner of the electronic device, and the first slot 6 is disposed at an upper frame of the conductive frame 4 and adjacent to the loop antenna, using the first left side of the first slot 6. The electric field coupling of the conductive bezel member 42 and the second second conductive bezel member 43 excites a new high frequency resonance to further broaden the high frequency bandwidth. The second conductive frame member 43 is a small portion of the conductive frame member that protrudes to the left of the first conductive member 41, or the second conductive frame member 43 may include the first conductive member 41. It is also conceivable that since the first slit 6 is disposed on the upper frame instead of the left and right borders, the user has less chance of holding the hand when used, so that the influence of the hand can be reduced; if the loop antenna is disposed at the lower right corner of the electronic device The first slot 6 may also be disposed on the lower frame of the conductive frame 4; wherein the conductive frame 4 may be a conductive frame formed of stainless steel or aluminum or other metal material. In addition, the electronic device provided by the present invention may be a portable electronic device such as a mobile communication terminal (mobile phone) or a notebook computer or a tablet computer or other small portable computer.

It can be seen from the above that an electronic device provided by an embodiment of the present invention has a monopole antenna 3 disposed therein for exciting a new high-frequency resonance, effectively widening a high-frequency bandwidth, and improving flexibility of an antenna trace; a first slot 6 is left between the first conductive frame member 42 and the second conductive frame member 43 in the conductive frame 4, and the first slot 6 is disposed near the loop antenna, and the first slot 6 can be utilized. The coupled excitation of the high frequency resonance at both sides of the electric field further broadens the high frequency bandwidth and reduces the impact of the hand.

In order to better understand the technical solution of the present invention, the following describes the structural arrangement and the loop antenna of the electronic device shown in FIG. 6 with a specific application scenario:

In this application scenario, the electronic device is assumed to be a mobile terminal (mobile phone), which includes a conductive bezel 4 (metal bezel), a grounding area in the circuit board, and a loop antenna, wherein the ring The antenna is disposed in the upper right corner of the mobile terminal, and the monopole antenna 3 in the loop antenna is connected to the positive antenna feed point 1, from the monopole antenna 3 to the positive antenna feed point 1, and connected to the first segment through the first trace 11 a conductive member 41 (ie, a portion of the upper right corner of the conductive frame 4), along the first conductive member 41, and finally connected to the grounded antenna feed point 2 via a second segment of the trace 12, the grounded antenna feed point 2 Connecting the area i or to form the loop antenna; it can be understood that a first passive device or a first active device 5 can be disposed between the first conductive member 41 and the grounded antenna feed point 2, The electrical length of the loop antenna can be adjusted by changing the value of the first passive device or the first active device 5, increasing the adjustability of the antenna. It can be understood that the first passive device 5 can be an inductor or a capacitor or a resistor or other passive device, and the first active device 5 can be a switch or a varactor or other active device. This is not specifically limited.

Further, as shown in FIG. 6, the conductive frame 4 may include a first conductive frame member 42, a second conductive frame member 43, and a third conductive frame member 44, wherein the first conductive frame member 42 and the A first slit 6 is left between the second conductive frame members 43 , and a second slit 7 is left between the first conductive frame member 42 and the third conductive frame member 44 , wherein the first slit 6 is disposed in the The vicinity of the loop antenna is such that the metal frame on both sides of the first slot 6 (ie, the first conductive frame member 42 and the second conductive frame member 43) are coupled to excite high frequency resonance to broaden the high frequency bandwidth; it is understood that In a practical application, in order to make the appearance of the device neat and tidy, the second slot 7 may be disposed at an axis symmetry with the first slot 6, which is not specifically limited herein. It is easy to think that, as shown in FIG. 6 , the first conductive frame member 42 , the second conductive frame member 43 and the third conductive frame member 44 are the frame members on the upper frame of the conductive frame 4 , and in some embodiments, The loop antenna is disposed at a lower right corner of the mobile terminal, and the first conductive frame member 42, the second conductive frame member 43, and the third conductive frame member 44 are frame members on the lower frame of the conductive frame 4, for this implementation manner No specific explanation or limitation is given.

In addition, the electronic device is provided with a frame grounding point, and the conductive frame 4 is connected to the edge grounding point by a wire, and is formed to be connected to the grounding area. As shown in the figure, the frame grounding point 8 and the frame connection point 9, through the wire and the conductive frame 4, and the grounding area is formed into a ground connection;

Further, since the metal frame on both sides of the first slit 6 can perform coupling excitation high frequency resonance, in order to make the coupling resonance adjustable, a second passive device can be disposed between the frame grounding point 8 and the first conductive frame member 42. Or the second active device 10, as shown in FIG. 7, wherein the value of the second passive device or the second active device 10 varies according to different application scenarios, by changing The value of the second passive device or the second active device 10 can adjust the electrical length of the coupled resonance, increasing the adjustability of the antenna. In addition, according to different application scenarios, the position of the grounding point of the frame 8 is also different. The position of the grounding point 8 of the frame can be changed to adjust the position of the coupling resonance, so that the resonance covers the required frequency band, and the grounding point of the frame is not in the embodiment of the present invention. The specific setting position is limited. It should be noted that the antenna resonance in this embodiment has three resonances in the high frequency band (1710 - 2170 MHz MHz) corresponding to the first-order mode resonance (differential mode) and 1/4 λ resonance (monopole). And the metal frame is coupled to the resonance.

It can be understood that the second slot 7 is only provided for aesthetic appearance, and is not used for coupling excitation resonance. Therefore, it is not necessary to provide a second passive device or between the frame grounding point 9 and the first conductive frame member 42. The second active device 10; wherein the second passive device 10 can be an inductor or a capacitor or a resistor or other passive device, and the second active device 10 can be a switch or a varactor or other The source device is not specifically limited herein. It is to be understood that, for the convenience and simplicity of the description, the specific configuration and function implementation of the loop antenna in the electronic device described above may be referred to the corresponding process in the foregoing loop antenna embodiment and combined with the corresponding loop antenna schematic. Let me repeat. It can be seen from the above that an electronic device provided by an embodiment of the present invention has a monopole antenna 3 disposed therein for exciting a new high frequency resonance, effectively widening a high frequency bandwidth, and improving a flexible conductive frame of the antenna trace. A first slit 6 is left between the first conductive frame member 42 and the second conductive frame member 43 on the fourth surface, and the first slit 6 is disposed near the loop antenna, and the electric field on both sides of the first slit 6 can be utilized. The coupled excitation high frequency resonance further broadens the high frequency bandwidth; the second passive device or the second active device 10 is disposed between the frame grounding point 8 and the first conductive frame member 42, so that the coupling resonance is adjustable, and the antenna is added. Adjustability.

The loop antenna and the related electronic device provided by the present invention are described in detail above. For those skilled in the art, according to the idea of the embodiment of the present invention, there are changes in the specific implementation manner and application scope. In summary, the content of the specification should not be construed as limiting the invention.

Claims

Rights request

1. A loop antenna, characterized in that it includes:

Positive antenna feed point and ground antenna feed point;

Wherein, a monopole antenna is connected to the positive antenna feed point or the ground antenna feed point; the positive antenna feed point is connected to a first conductive component, and is connected to the ground through the first conductive component Antenna feed point, the first conductive component is a part of the conductive frame on the periphery of the electronic device equipped with the loop antenna.

2. The loop antenna according to claim 1, characterized in that a first passive component or a first active component is provided between the first conductive component and the ground antenna feed point.

3. The loop antenna according to claim 2, wherein the first passive component is an inductor, a capacitor, or a resistor, and the first active component is a switch or a varactor diode.

4. An electronic device, characterized in that it includes a conductive frame, a circuit board and the loop antenna according to any one of claims 1 to 3;

The ground antenna feed point of the loop antenna is connected to the ground area on the circuit board; the conductive frame includes a first conductive frame member and a second conductive frame member, and the first conductive frame member and the A first gap is left between the second conductive frame members, and the first gap is provided near the loop antenna, so that the first conductive frame member and the second conductive frame member are coupled to excite resonance.

5. The electronic device according to claim 4, wherein a frame ground point is provided on the electronic device, and the conductive frame is connected to the frame ground point and is grounded to the ground area.

6. The electronic device according to claim 5, characterized in that a second passive device or a second active device is provided between the frame ground point and the conductive frame.

7. The electronic device according to claim 6, wherein the second passive component is an inductor, a capacitor, or a resistor, and the second active component is a switch or a varactor diode.

8. The electronic device according to any one of claims 4 to 7, characterized in that the conductive frame is a conductive frame formed of a metal material such as stainless steel or aluminum.

9. The electronic device according to any one of claims 4 to 7, characterized in that the electronic device is a mobile phone or a tablet computer.