CN210182568U

CN210182568U - Multi-frequency multi-mode antenna

Info

Publication number: CN210182568U
Application number: CN201921614119.2U
Authority: CN
Inventors: Bo Song; 宋博; Yue Shi; 史悦
Original assignee: Nanchang Black Shark Technology Co Ltd
Current assignee: Nanchang Black Shark Technology Co Ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2020-03-24
Anticipated expiration: 2029-09-25

Abstract

The utility model provides a multifrequency multimode antenna, includes the metal crate to and the antenna module who is connected with the metal crate, set up a gap on the metal crate, the antenna module includes antenna feed point and connects filter module, nearly present ground pin and the joint pin of striding on the metal crate, antenna feed point and filter module set up respectively in the both sides in gap, filter module one end is connected with the metal crate, other end ground connection, nearly present ground pin sets up in one side that the gap was kept away from to the antenna feed point, the joint pin of striding sets up in one side that the gap was kept away from to the filter module. The utility model discloses regard the metal frame in the mobile terminal as the irradiator of this multifrequency multimode antenna, retrench the structure of this multifrequency multimode antenna, satisfy the more and more frequency channel demand of antenna among the mobile terminal simultaneously.

Description

Multi-frequency multi-mode antenna

Technical Field

The utility model relates to an antenna technology field especially relates to a multifrequency multimode antenna.

Background

With the gradual popularization and application of the mobile communication technology (5G), the data transmission rate of the mobile terminal is faster and faster, and people have more and more requirements on audio and video, games, high-definition real-time video communication and the like. Under the trend, more and more frequency bands need to be realized by the mobile terminal antenna, resulting in an increase in the number of antennas in the terminal.

When the antennas in most of the current mobile terminals implement multiple frequency bands, the method of increasing the number of antennas is also adopted at most. This method is often limited by the space environment of the mobile terminal, and particularly, the current mobile terminal models tend to be light, thin and miniaturized. And as the number of antennas is increased, the distance between the antennas is reduced, so that the isolation between the antennas is also deteriorated, and it is difficult to ensure that all the antennas have a good radiation environment, so that the performance of some antennas is deviated. Therefore, the method of implementing the multi-band and multi-mode antenna by increasing the number has failed to satisfy the current demand of the mobile terminal.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need to provide a multi-band and multi-mode antenna, which is suitable for the problem that the antenna in the mobile terminal in the prior art is limited in the space of the body and has poor performance.

A multi-frequency multi-mode antenna comprises a metal frame and an antenna assembly connected with the metal frame, wherein a gap is formed in the metal frame, the antenna assembly comprises an antenna feeding point, a filtering module, a proximity grounding pin and a cross-over grounding pin, the filtering module, the proximity grounding pin and the cross-over grounding pin are connected to the metal frame, the antenna feeding point and the filtering module are respectively arranged on two sides of the gap, one end of the filtering module is connected with the metal frame, the other end of the filtering module is grounded, the proximity grounding pin is arranged on one side, away from the gap, of the antenna feeding point, and the cross-over grounding pin is arranged on one side, away from the gap, of the filtering module.

Further, in the multi-band multi-mode antenna, the antenna feeding point is connected to the metal frame through a matching circuit.

Further, in the multi-frequency and multi-mode antenna, the filtering module is in a high-impedance state when the frequency is around 2.2GHz, and is in a low-impedance state when the frequency is around 5.2 GHz.

Further, in the multi-frequency multi-mode antenna, the filtering module includes a first inductor and a capacitor connected in parallel, and a second inductor connected in series with the first inductor and the capacitor.

Further, in the multi-frequency and multi-mode antenna, the filtering module may be in any form of:

comprises a capacitor;

comprises an inductor;

the device comprises a capacitor and an inductor which are connected in parallel;

including a capacitor and an inductor connected in series.

Further, in the multi-frequency multi-mode antenna, the width of the slot is 0.5mm to 2 mm.

Further, in the multi-frequency multi-mode antenna, a main board is further disposed in the metal frame, and the antenna feed point is connected to the main board radio frequency path.

Further, the above multi-frequency multi-mode antenna, wherein the antenna assembly is disposed in a clearance area between the metal frame and the main board.

The embodiment of the utility model provides an in with the metal crate among the mobile terminal as the irradiator of this multifrequency multimode antenna, retrench the structure of this multifrequency multimode antenna, can realize the length of earth's path under the antenna current through this filtering module simultaneously to realize the effect of a multifrequency multimode. The embodiment of the utility model provides a to the more and more frequency channel demand of antenna among the mobile terminal to and more nervous mobile terminal space, design the multifrequency multimode integrated antenna who realizes functions such as GPS, WIFI, 2.4G/5G, LTE, Sub6G under the compact environment.

Drawings

Fig. 1 is a schematic perspective view of a multi-frequency multi-mode antenna according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a multi-frequency multi-mode antenna according to a first embodiment of the present invention;

fig. 3 is a schematic circuit diagram of a filtering module according to a first embodiment of the present invention;

fig. 4 is a schematic circuit diagram of a matching circuit according to a first embodiment of the present invention;

fig. 5 is a result of S parameter simulation of the multi-band multi-mode antenna according to the first embodiment of the present invention;

fig. 6 shows the simulation result of the S parameter of the multi-frequency multi-mode antenna according to the second embodiment of the present invention;

fig. 7 is a schematic circuit diagram of a filtering module according to a third embodiment of the present invention;

FIG. 8 is a schematic circuit diagram of a matching circuit according to a third embodiment of the present invention

Fig. 9 shows a simulation result of S-parameter of the multi-band multi-mode antenna according to the third embodiment of the present invention.

Description of the main elements

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The embodiment of the invention is given in the attached drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, this embodiment is 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. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

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.

Please refer to fig. 1 and fig. 2, which are schematic views illustrating a multi-band multi-mode antenna according to a first embodiment of the present invention, applied in a mobile terminal, such as a mobile phone, a tablet computer, and a wearable device. The multi-frequency multi-mode antenna includes a metal frame 10 and an antenna assembly connected to the metal frame 10. The metal frame 10 is a frame of a metal component of a mobile terminal, such as a metal middle frame, a metal rear case, or an FPC (flexible printed circuit) frame in a mobile phone. The metal frame is provided with a slot 11, and the slot 11 is used as a radiation port of the electromagnetic wave of the antenna. The width of the gap 11 can be 0.5-2 mm, and too large a gap width will affect the appearance, while too small a gap width will result in current series flow or short circuit, which will deteriorate the radiation performance.

The antenna assembly includes an antenna feed point 20 connected to a metal frame 10, a filtering module 40, a proximity ground pin G1, and a cross-stitch ground pin G2. The antenna feeding point 20 and the filtering module 40 are respectively disposed at two sides of the slot 11, and the antenna feeding point 20 can feed and receive radio frequency signals. In practical implementation, the antenna feeding point 20 is connected to the metal frame through a matching circuit 30, and the matching circuit 30 may be composed of an inductor, a capacitor, a switch, and an adjustable capacitor, so as to match the antenna impedance.

The filter module 40 is used to control the impedance state of the antenna, and has one end connected to the metal frame 10 and the other end grounded. As shown in fig. 3, the filter module 40 includes a first inductor L11 and a capacitor C11 connected in parallel, and a second inductor L12 connected in series with the first inductor L11 and the capacitor C11. The values of devices L11, C11 and L12 in the filter module are adjusted to enable the filter module to be in an open circuit and high resistance state near the frequency of 2.2GHz, to be in a short circuit and low resistance state near the frequency of 5.2GHz and to be in a capacitance changing along with the frequency between 2.2GHz and 5.2 GHz. By utilizing the above-described characteristics of the filter module 40, the length of the antenna current lower ground path can be realized. Different current paths can realize different antenna frequency bands of the antenna, so that the effect of multi-frequency and multi-mode is realized.

The proximity ground pin G1 is disposed on the side of the antenna feed point away from the slot 11, and the cross-slot ground pin G2 is disposed on the side of the filtering module 40 away from the slot 11. The antenna assembly, slot 11, and metal frame 10 between the proximity ground pin G1 and the cross-over ground pin G2 constitute the multi-band multi-mode antenna. In specific implementation, the multi-frequency multi-mode antenna can be distributed at any position of the top end, the lower end, the side edge and the like of the metal frame of the mobile terminal.

It can be understood that the multi-frequency multi-mode antenna arranged in the mobile terminal is not limited to one, the other embodiments of the present invention can also set up analysis in other areas of the metal frame, and set up one or more multi-frequency multi-mode antennas to realize more antenna frequency bands.

The mobile terminal further includes a main board 70, the main board 70 is disposed in the metal frame 10, and in order to ensure good performance of the multi-frequency and multi-mode antenna, the antenna assembly may be disposed in a gap area between the metal frame 10 and the main board 70. And, the antenna feed point 20 is connected to the motherboard 70 in a radio frequency path.

Specifically, in the embodiment of the present invention, this matching circuit is as shown in fig. 4, including parallelly connected and respectively grounded electric capacity C12, inductance L13, inductance L14, and the electric capacity C13 of connecting between inductance L13 and inductance L14, this electric capacity C12 value is 0.2pF, inductance L13 value is 1.6nH, inductance L14 value is 17nH and electric capacity C13 value is 1.1 pF. In the filter module, the value of the capacitor C11 is 0.8pF, the value of the first inductor L11 is 6.4nH, and the value of the second inductor L12 is 1.4 nH.

According to the design of the filtering module and the matching circuit, the S parameter of the multi-frequency multi-mode antenna in the embodiment of the utility model is as shown in FIG. 5, and has a resonance near 1.6GHz, thereby realizing the work of the GPS frequency band; the antenna has a resonance near 2.4GHz, and can realize the working of WIFI2.4G, B7, B41 and n41 frequency bands; the resonance is arranged near 3.5GHz, so that the n78 frequency band work can be realized; the frequency band has a resonance near 5.2GHz and 5.8GHz respectively, and the frequency band can realize 5G operation.

The first three resonances in fig. 5 can be easily realized when the filter module 40 is not added, and after the filter module 40 is added, the matching circuit is simultaneously adjusted by using different impedance characteristics of the filter module 40 in different frequency bands, so that the frequency deviation of the original mode is adjusted, and the resonances near 5.2GHz and 5.8GHz are added.

The multi-frequency multi-mode antenna mainly comprises a slot 11, an antenna feeding point 20 and a filter module 40 which are respectively arranged at two sides of the slot 11, a near feed grounding pin G1 which is arranged at the same side of the antenna feeding point 20, a cross-joint grounding pin G2 which is arranged at the far end of the other side of the slot 11, and a metal frame 10 which is arranged between the near feed grounding pin G1 and the cross-joint grounding pin G2, wherein the filter module 40 is in an open-circuit high-impedance state near 2.2GHz, a short-circuit low-impedance state near 5.2GHz and a capacitance which changes along with frequency between 2.2GHz and 5.2GHz by adjusting the values of L1, C1 and L2 in the filter module 40. In this embodiment, the metal frame in the mobile terminal is used as the radiator of the multi-frequency and multi-mode antenna, so that the structure of the multi-frequency and multi-mode antenna is simplified, and the length of the ground path of the antenna current is adjusted by using the characteristics of the filtering module, thereby achieving a multi-frequency and multi-mode effect.

Aiming at the increasing frequency band requirements of antennas in mobile terminals and the increasingly tense mobile terminal space, the embodiment designs a multi-frequency and multi-mode integrated antenna which realizes the functions of GPS, WIFI2.4G/5G, LTE (including frequency bands B7 and B41) and Sub6G (including frequency bands n41 and n78) in a compact environment.

Please refer to fig. 6, which is an S parameter of the multi-band and multi-mode antenna in the second embodiment of the present invention, in this embodiment, by adjusting values of each device in the filter module and the matching circuit, the antenna can work in the frequency bands of GPS, WIFI2.4G, 5G, B7, B41, n41, n78, and n79 on the basis of the antenna structure in the embodiment. This embodiment is the same as the first embodiment of the present invention in terms of the structure of the filter module and the matching circuit, except that, in the filter module of this embodiment, the value of the capacitor C11 is 0.7pF, the value of the first inductor L11 is 6.4nH, and the value of the second inductor L12 is 3.5 nH; the values of the devices in the matching circuit are the same as those in the first embodiment, and are respectively: the capacitance C12 takes a value of 0.2pF, the inductance L13 takes a value of 1.6nH, the inductance L14 takes a value of 17nH, and the capacitance C13 takes a value of 1.1 pF.

As shown in fig. 6, in this embodiment, there is a resonance near 1.6GHz, so as to implement GPS frequency band operation; the antenna has a resonance near 2.5GHz, and can realize the working of WIFI2.4G, B7, B41 and n41 frequency bands; the resonance is arranged near 3.5GHz, so that the n78 frequency band work can be realized; and the frequency bands of n79 and WIFI5G can work by respectively having one resonance near 4.9GHz and 5.8 GHz.

Further, in other embodiments of the present invention, the filtering module may select different implementation forms according to the specific antenna environment and the difference of the required working frequency band. For example, any of the following implementations may also be used:

comprises a capacitor and an inductor which are connected in series;

the filtering module comprises a capacitor;

includes an inductor.

The filtering module adopting any form can determine the value of each device according to the requirement of the actual working frequency band. During concrete implementation, accessible series switch can realize to the filtering module the utility model discloses switching between the several kinds of filtering module forms of mentioning in the implementation to realize multiple antenna frequency channel characteristic.

For example, in the third embodiment of the present invention, a filter module as shown in fig. 7 is adopted, which includes an inductor L36 and a capacitor C35 connected in series, and the value of the inductor L36 and the value of the capacitor C35 are 2.4nH and 0.3pF, respectively. As shown in fig. 8, in the present embodiment, the matching module includes a capacitor C31, an inductor L31, a filter circuit, an inductor L35, and a capacitor C34, which are connected in parallel and are respectively connected to ground, and an inductor L32 and a capacitor C33, which are connected in series between the filter circuit and the inductor L35. The filter circuit is connected in parallel by an inductor L33 and a capacitor C32, and then is connected in series with an inductor L34 which is grounded. In the matching module, the capacitance C31 is 1.4pF, the inductance L31 is 4nH, the inductance L33 is 2.5nH, the capacitance C32 is 2.5pF, the inductance L34 is 1.4nH, the inductance L35 is 18nF, the capacitance C34 is 0.1pF, the inductance L32 is 5nH, and the capacitance C33 is 0.7 pF.

The S parameter of the multi-band multi-mode antenna according to the third embodiment of the present invention is shown in fig. 9. In this embodiment, on the basis of the first embodiment, the antenna can work in the frequency bands of GPS, WIFI2.4G, 5G, B1, B3, B7, B39, B41, n41, and n 79. In the figure, the resonances near 1.6GHz, 2GHz and 2.5GHz are combined together to realize the work on the frequency bands of GPS, WIFI2.4G, B1, B3, B7, B39, B41 and n41, the resonances near 5GHz can realize the work on the frequency band of n79, and the resonances near 5GHz and 5.8GHz are combined together to form the work on the frequency band of WIFI 5G.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

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

Claims

1. A multi-frequency multi-mode antenna comprises a metal frame and an antenna assembly connected with the metal frame, and is characterized in that a gap is formed in the metal frame, the antenna assembly comprises an antenna feeding point, a filtering module, a proximity grounding pin and a cross-over grounding pin, the filtering module, the proximity grounding pin and the cross-over grounding pin are connected to the metal frame, the antenna feeding point and the filtering module are respectively arranged on two sides of the gap, one end of the filtering module is connected with the metal frame, the other end of the filtering module is grounded, the proximity grounding pin is arranged on one side, away from the gap, of the antenna feeding point, and the cross-over grounding pin is arranged on one side, away from the gap, of the filtering module.

2. The multi-frequency, multi-mode antenna of claim 1, wherein said antenna feed point is connected to said metal frame by a matching circuit.

3. The multi-frequency, multi-mode antenna of claim 1, wherein the filtering module exhibits a high impedance state at a frequency of about 2.2GHz and a low impedance state at a frequency of about 5.2 GHz.

4. The multi-frequency, multi-mode antenna of claim 1, wherein the filtering module comprises a first inductor and a capacitor connected in parallel, and a second inductor connected in series with the first inductor and the capacitor.

5. The multi-frequency, multi-mode antenna of claim 1, wherein the filtering module takes the form of any one of:

comprises a capacitor;

comprises an inductor;

including a capacitor and an inductor connected in series.

6. The multi-frequency multi-mode antenna of claim 1, wherein the slot has a width of 0.5mm to 2 mm.

7. The multi-frequency multi-mode antenna of claim 1, further comprising a motherboard disposed within the metal frame, wherein the antenna feed point is connected to the motherboard rf path.

8. The multi-frequency, multi-mode antenna of claim 7, wherein said antenna assembly is disposed in a clearance area between said metal frame and said motherboard.