CN112864587A

CN112864587A - Antenna device and wireless communication equipment

Info

Publication number: CN112864587A
Application number: CN201911099319.3A
Authority: CN
Inventors: 陈鹏飞; 周昌文
Original assignee: Oneplus Technology Shenzhen Co Ltd
Current assignee: Oneplus Technology Shenzhen Co Ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2021-05-28
Anticipated expiration: 2039-11-12
Also published as: CN112864587B

Abstract

The application relates to an antenna device, which comprises a metal floor, a metal base plate and a metal base plate, wherein a clearance area is arranged on the metal floor; the feed port is connected with the metal floor; the first radiator is arranged in the clearance area and is connected with the metal floor; one end of the radiation branch node is connected with the feed port, and the other end of the radiation branch node is connected with the first radiator; and the second radiator is arranged in the clearance area, is connected with the metal floor and forms electromagnetic coupling with the first radiator. The antenna device can realize resonance of a plurality of frequency bands on a single antenna at the same time, and occupies small space. The application also relates to a wireless communication device.

Description

Antenna device and wireless communication equipment

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to an antenna device and a wireless communication device having the same.

Background

An antenna on a wireless communication device is a structure mounted on the wireless communication device for receiving and transmitting transceiver signals. Since different wireless communication providers may use different signal transmission frequency bands, the antenna device needs to be capable of performing multi-band operation to ensure that the wireless communication device can conveniently and clearly receive wireless signals.

In a conventional multi-frequency antenna, a plurality of feeding ports are usually provided to form a plurality of antennas, or a plurality of parasitic resonances are provided to increase the frequency band. However, this method may increase the spatial size of the antenna device and thus is not suitable for use in wireless communication devices with increasingly smaller sizes.

Disclosure of Invention

In view of the above, it is desirable to provide an antenna device that is suitable for metal environments, has a small size, and can generate multi-frequency resonance.

An antenna device comprises a metal floor provided with a clearance area; a feed port connected with the metal floor; the first radiator is arranged in the clearance area and is connected with the metal floor; one end of the radiation branch node is connected with the feed port, and the other end of the radiation branch node is connected with the first radiator; and the second radiator is arranged in the clearance area, is connected with the metal floor and forms electromagnetic coupling with the first radiator.

In the antenna device, the first radiator and the second radiator are electromagnetically coupled, and multi-band resonance is realized by sharing the radiation branch. Therefore, the antenna device is compact and reasonable in layout, and the space size of the antenna device is not increased while multi-frequency resonance is realized. Meanwhile, the antenna device is only provided with one feed port, so that mutual influence among the feed ports is avoided, and the feed ports do not need to be separated through devices such as a duplexer and the like, thereby reducing loss on a transmission path and improving the transmission efficiency of signals.

In one embodiment, the clearance area includes a groove opened at an edge of the metal floor, and one end of the first radiator is connected to a groove wall of the groove and the other end extends in a direction parallel to a groove bottom of the groove.

In one embodiment, the groove bottom of the groove is a plane or a curved surface.

In one embodiment, the radiation branch includes a first radiation branch connected to the feed port and arranged in parallel with the first radiator; one end of the second radiation branch is connected with one end of the first radiation branch, which is far away from the feed port, and the other end of the second radiation branch extends along the direction vertical to the first radiation branch and is connected with the first radiation body; the second radiation branch knot divides the first radiation body into a radiation area and a coupling area, the radiation area is connected with the metal floor, and the coupling area and the second radiation body are arranged at intervals and are used for forming electromagnetic coupling with the second radiation body.

In one embodiment, one end of the second radiator is connected to a side wall of the groove far away from the first radiator, and the other end of the second radiator extends in a direction parallel to the bottom of the groove and is spaced from the coupling region.

In one embodiment, the metal floor further comprises a parasitic radiation branch, one end of the parasitic radiation branch is connected with the metal floor, the other end of the parasitic radiation branch is a free end, and the parasitic radiation branch and the radiation branch are arranged at intervals to form electromagnetic coupling.

In one embodiment, the antenna device further comprises a matching unit, wherein the matching unit is connected between the feeding port and the radiation branch and used for tuning the resonant frequency and the bandwidth of the antenna device.

In one embodiment, the clearance area is filled with a plastic material, and the first radiator and the second radiator are both disposed on a surface of the plastic material.

A wireless communication device comprises a communication module, wherein the communication module comprises a radio frequency unit, the communication module further comprises the antenna device, and the feed port is connected with the radio frequency unit and used for carrying out signal transmission with the radio frequency unit.

Above-mentioned wireless communication equipment, through position, size and the shape of each minor matters in the adjustment antenna device, can satisfy multiple signal transmission frequency channel simultaneously, and this wireless communication equipment possesses metal casing, and the outward appearance is fashionable, accords with market demand.

In one embodiment, the radiating stub, the first radiator, and the second radiator are all formed from a conductive structure on the wireless communication device.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of an antenna device according to the present application;

fig. 2 is a schematic current path diagram of an antenna device according to the present application;

fig. 3 is a schematic frequency response diagram of an embodiment of an antenna apparatus of the present application;

fig. 4 is a schematic structural diagram of another embodiment of an antenna device according to the present application.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "upper," "lower," "front," "rear," "circumferential," and the like are based on the orientation or positional relationship shown in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the conventional technology, technicians also increase the frequency band and bandwidth supported by the antenna by adding an aperture switch. However, the aperture tuning is essentially to change different resonances of the antenna at different times to meet different frequency bands, and thus can only meet the time-sharing requirements of the frequency bands, such as cellular antennas. When a plurality of frequency bands need to be supported simultaneously, the aperture switch cannot meet the requirements, and the increase of the aperture switch device also causes the increase of the manufacturing cost of the antenna. For an antenna that uses a single resonance to cover different frequency bands or generates two resonances to satisfy different frequency bands, the problem that the single resonance frequency band is not wide or the distance between the two resonance frequencies is not long usually exists.

In addition, in order to pursue fashionability of appearance of the wireless communication device, metal is generally used to prepare a frame of the wireless communication device, however, the metal environment causes loss of signal transmission, and thus challenges are also presented to design of the antenna device.

The defects existing in the above solutions are the results obtained after the inventor has practiced and studied carefully, so the discovery process of the above problems and the solutions proposed by the following embodiments of the present application for the above problems should be the contribution of the inventor to the present application in the process of the present application.

Referring to fig. 1, the present application provides an antenna device, which can be used as a back shell of a mobile terminal such as a mobile phone, and includes a metal floor 100, an antenna body, and a feeding port 10, wherein the feeding port 10 is connected to the metal floor 100. The metal floor 100 is provided with a clearance area 20 for providing an open space for the antenna to prevent electromagnetic waves emitted and received by the antenna from being shielded or interfered by the metal floor 100.

The antenna body is disposed on the metal floor 100, and includes a radiation branch 103, a first radiator 101, and a second radiator 102.

Specifically, the first radiator 101 is disposed in the clearance area 20 and connected to the metal floor 100 through the radiation branch 103. At this time, the radiation branch 103, the first radiator 101 and the metal floor 100 form a first radiation structure. By adjusting the size, position and shape of the first radiator 101, the first radiation structure can have two current paths, and thus the first radiation structure realizes dual-frequency resonance. As shown in fig. 2, the two current paths are a first current path 1 and a second current path 2, respectively, where the first current path 1 is shown by a thick solid line with an arrow, the corresponding resonant frequency is the first resonant frequency f1, the second current path 2 is shown by a broken line with an arrow, and the corresponding resonant frequency is the second resonant frequency f 2.

The second radiator 102 is disposed in the clearance area 20, and the second radiator 20 is connected to the metal floor 100 and electromagnetically coupled to the first radiator 101. The electromagnetic coupling mentioned in this case means an indirect electrical connection. At this time, the radiation branch 103, the second radiator 102, and the metal floor 100 form a second radiation structure. As shown in fig. 2, a third current path 3 is formed in the second radiating structure, as indicated by a dotted line with an arrow, and the corresponding resonant frequency is a third resonant frequency f 3.

In the antenna device, the first radiator 101 and the second radiator 102 form electromagnetic coupling, and resonance of at least three frequency bands is realized by sharing the radiation branch 103. The antenna device is a single antenna device, is compact and reasonable in layout, and does not increase the space size of the antenna device while realizing multi-frequency resonance. Meanwhile, the antenna device is only provided with one feed port 10, so that the mutual influence among different feed ports is avoided, and the feed ports do not need to be separated through devices such as a duplexer and the like, thereby reducing the loss on a transmission path and improving the transmission efficiency of signals.

According to some embodiments of the present invention, as shown in fig. 1, the clearance area 20 includes a groove opened at the edge of the metal floor 100, and the first radiator 101 is connected to the wall of the groove and extends in a direction parallel to the bottom of the groove, wherein the bottom of the groove may be a plane or a curved surface. Through setting up first irradiator 101 along the direction that is on a parallel with clearance district 20 tank bottoms, made things convenient for the length adjustment to first current path 1, also made the overall arrangement of first radiation structure more reasonable orderly simultaneously, be favorable to reducing the occupation space of antenna main part. In addition, the groove bottom of the clearance area 20 is set to be a plane, which also facilitates the processing of the antenna device, and the groove bottom of the clearance area 20 is set to be a curved surface, which can make full use of the space of the clearance area 20, facilitate the adjustment of the lengths of the first radiator 101 and the second radiator 102, and further facilitate the adjustment and control of the antenna device to realize the resonance of different frequency bands.

Further, please refer to fig. 1 again, the radiation branch 103 includes a first radiation branch 1031, and the first radiation branch 1031 is connected to the feed port 10 and arranged in parallel with the first radiator 101; one end of the second radiation branch 1032 is connected to the end of the first radiation branch 1031 far away from the feed port 10, and the other end extends in a direction perpendicular to the first radiation branch 1031 and is connected to the middle of the first radiation body 101; the second radiation branch 1032 divides the first radiator 101 into a radiation region 1011 and a coupling region 1012. Further, the radiation area 1011 is connected to the metal floor 100, so as to form a first radiation structure with the radiation branch 103 and the metal floor 100; the coupling region 1012 is spaced apart from the second radiator and configured to form electromagnetic coupling with the second radiator 102, so that the radiation branch 103 forms a second radiation structure with the second radiator 102 and the metal floor 100 through the coupling region 1012. Wherein the resonant mode of the first radiating structure and the second radiating structure may be a loop resonant mode.

Further, one end of the second radiator 102 is connected to a slot wall of the clearance area 20 on a side away from the first radiator 101, and the other end extends in a direction parallel to the slot bottom of the clearance area 20 and is spaced from the coupling area 1012. Preferably, the second radiator 102 and the first radiator 101 are located in a plane parallel to the slot bottom of the clearance 20. It should be noted that the size of the gap between the end of the second radiator 102 close to the coupling region 1012 and the coupling region 1012 can be adjusted according to the actual resonant frequency requirement, so as to implement the multi-band resonance of the antenna apparatus of the present application.

In addition, the radiation branches 103 are arranged into the first radiation branch 1031 and the second radiation branch 1032 which are vertically connected end to end, which is also beneficial to adjusting the position, size and shape of the radiation branches 103, thereby facilitating the adjustment of the resonant frequency and bandwidth of the antenna device.

According to some embodiments of the invention, the antenna arrangement further comprises a parasitic radiating stub 104. Specifically, one end of the parasitic radiation branch 104 is connected to the metal floor 100 through the connecting member 105, and the other end is suspended as a free end. The parasitic radiation branch 104 is spaced adjacent to the radiation branch to form electromagnetic coupling, so that a fourth current path 4 can be formed in the parasitic radiation branch 104, as shown in fig. 2, where the fourth current path 4 is shown by a thin solid line with an arrow, and the corresponding resonant frequency is the fourth resonant frequency f 4. By adding the parasitic radiation branch 104, additional resonant frequencies in different frequency bands can be added, so that the antenna device can realize a multi-band resonant effect at the same time. It is understood that the radiating branch 103, the first radiator 101, the second radiator 102 and the parasitic radiating branch are made of conductive material.

Fig. 3 is a schematic diagram of the frequency response of the antenna device of the present embodiment, in which the horizontal axis represents frequency in GHz and the vertical axis represents return loss in dB. The first resonant frequency f1, the second resonant frequency f2, the third resonant frequency f3 and the fourth resonant frequency f4 have been shown in fig. 3 by solid arrows, respectively. In the present embodiment, the reflection loss is referenced to-5 dB, i.e., a return loss lower than-5 dB indicates an acceptable communication quality range. As can be seen from fig. 3, the first resonant frequency f1 can cover low frequency diversity around 1.175GHz, the fourth resonant frequency f4 can cover GPS frequency band around 1.5GHz, the second resonant frequency f2 can cover WiFi communication frequency band around 2.4GHz, and the third resonant frequency f3 can cover high frequency diversity around 2.9 GHz.

Corresponding to signals of different frequency bands, the current in the antenna device of the present embodiment can implement multi-band operation through corresponding current paths, respectively. Specifically, the frequency band and the bandwidth of the resonant frequency can be adjusted by adjusting the position, the shape and the size of each branch. In addition, the antenna device is small in size, small in required space and high in practicability.

According to some embodiments of the invention, the antenna device may further comprise a matching unit. The matching unit is connected between the feed port 10 and the radiating stub 103. Specifically, the matching unit is connected between the feeding port 10 and the first radiation branch 1031, and is used for tuning the resonant frequency and the bandwidth of the antenna device. The performance of the individual radiating structures can be improved by the tuning effect of the matching units.

According to some embodiments of the present invention, the clearance area 20 is filled with a plastic material, and the first radiator 101 and the second radiator 102 are disposed on a surface of the plastic material. The clearance area 20 is filled with non-metal structures such as plastic, so that a firm and attractive effect can be achieved, and meanwhile, the first radiator 101 and the second radiator 102 are arranged on the surface of the plastic, so that the layout of the antenna body is clear and the antenna body does not occupy too much space. The depth of the clearance area 20 is in the millimeter order, so that the whole antenna device can be ensured to have higher structural firmness, and the appearance can be ensured to be attractive.

According to some embodiments of the present invention, the radiating branches 103, the first radiator 101, and the second radiator 102 may be bent adaptively according to the internal structure of the wireless communication device. As shown in fig. 4, since the clearance area 20 is disposed at the corner, the bottom of the clearance area 20 is an arc surface, which is beneficial to adjusting the length of the first radiator 101, and correspondingly, the second radiator 102 can be bent adaptively, so as to fully utilize the space of the clearance area 20, so that the structure of the antenna body is more compact, and this does not affect the multi-frequency resonance effect of the antenna device. It is understood that fig. 4 only represents an embodiment, and the radiation branch 103, the first radiator 101, and the second radiator 102 in the antenna device may be bent in other shapes according to actual space requirements.

The present application further provides a wireless communication device, which includes a communication module, the communication module includes a radio frequency unit, wherein the communication module further includes the antenna device as described above, and the feed port 10 is connected to the radio frequency unit, and is configured to perform signal transmission with the radio frequency unit.

According to the wireless communication equipment, the positions, the sizes and the shapes of all the branches in the antenna device are adjusted, so that multiple signal transmission frequency bands can be met simultaneously, and the wireless communication process is facilitated. In addition, the wireless communication equipment is provided with the metal shell, is fashionable in appearance and meets the market demand.

In this embodiment, the first radiator 101 and the second radiator 102 may be formed by a conductive structure in the wireless communication device, such as a metal shell, so as to further reduce the spatial size of the antenna device, which is beneficial to implementing miniaturization development of the wireless communication device. The wireless communication device can be a mobile phone, a wristwatch device, an earphone device or other wearable devices, and can also be a television, a set-top box, a digital camera and other electronic devices.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An antenna device, comprising:

the metal floor is provided with a clearance area;

a feed port connected with the metal floor;

the first radiator is arranged in the clearance area and is connected with the metal floor;

one end of the radiation branch node is connected with the feed port, and the other end of the radiation branch node is connected with the first radiator; and the number of the first and second groups,

and the second radiating body is arranged in the clearance area, is connected with the metal floor and forms electromagnetic coupling with the first radiating body.

2. The antenna device according to claim 1, wherein the clearance area includes a groove opened at an edge of the metal ground plate, and one end of the first radiator is connected to a groove wall of the groove and the other end extends in a direction parallel to a bottom of the groove.

3. The antenna device according to claim 2, wherein the groove bottom of the groove is planar or curved.

4. The antenna device according to claim 2 or 3, characterized in that the radiating stub comprises:

the first radiation branch is connected with the feed port and arranged in parallel with the first radiation body; and the number of the first and second groups,

one end of the second radiation branch is connected with one end of the first radiation branch, which is far away from the feed port, and the other end of the second radiation branch extends along the direction vertical to the first radiation branch and is connected with the first radiation body;

the second radiation branch knot divides the first radiation body into a radiation area and a coupling area, the radiation area is connected with the metal floor, and the coupling area and the second radiation body are arranged at intervals and are used for forming electromagnetic coupling with the second radiation body.

5. The antenna device of claim 4, wherein the second radiator has one end connected to a side wall of the slot away from the first radiator and the other end extending in a direction parallel to a bottom of the slot and spaced apart from the coupling region.

6. The antenna device of claim 1, further comprising:

and one end of the parasitic radiation branch knot is connected with the metal floor, the other end of the parasitic radiation branch knot is a free end, and the parasitic radiation branch knot and the radiation branch knot are arranged at intervals to form electromagnetic coupling.

7. The antenna device according to claim 1, further comprising a matching unit interposed between the feeding port and the radiating stub for tuning a resonant frequency and a bandwidth of the antenna device.

8. The antenna device as claimed in claim 1, wherein the clearance area is filled with a plastic material, and the first radiator and the second radiator are disposed on a surface of the plastic material.

9. A wireless communication device comprising a communication module, said communication module comprising a radio frequency unit, characterized in that said communication module further comprises an antenna arrangement according to any of claims 1-8, wherein said feed port is connected to said radio frequency unit for signal transmission therewith.

10. The wireless communication device of claim 9, wherein the radiating stub, the first radiator, and the second radiator are all formed from conductive structures on the wireless communication device.