CN107026313B

CN107026313B - Antenna for wireless communication module

Info

Publication number: CN107026313B
Application number: CN201610066559.3A
Authority: CN
Inventors: 纪光庭; 江忠信
Original assignee: Universal Scientific Industrial Shanghai Co Ltd
Current assignee: Universal Scientific Industrial Shanghai Co Ltd
Priority date: 2016-01-29
Filing date: 2016-01-29
Publication date: 2020-05-19
Anticipated expiration: 2036-01-29
Also published as: CN107026313A

Abstract

The invention relates to an antenna for a wireless communication module, comprising: a feed-in part, a grounding part and a first radiation part. The grounding part has a first end and a second end, the first end of the grounding part is used for grounding, and the second end of the grounding part is connected to a first side of the feed-in part, wherein the grounding part comprises a bent part adjacent to the first end. The first radiation portion includes: the first adjusting arm is connected to the second adjusting arm, the first end is connected to a second side adjacent to the feed-in portion, the second side is adjacent to the first side and the second end of the grounding portion, the second end of the first radiation portion is in the first adjusting arm, a gap is formed between the first adjusting arm and the bending portion of the grounding portion, and an included angle smaller than 90 degrees is formed between the second adjusting arm and the first adjusting arm.

Description

Antenna for wireless communication module

Technical Field

The present invention relates to antennas for wireless communication modules. More specifically, the present invention relates to an antenna for a wireless communication module having a small size and excellent efficiency.

Background

In the case of wireless communication technology and products, antenna products or technology are important key components. In order to ensure stable internet access capability and data download speed, the personal mobile device needs an antenna device with excellent performance to enhance its signal transceiving capability, so as to reduce the obstacles in communication. In a personal mobile wireless device, in order to increase portability, it is a necessary development direction to hide an Antenna design and integrate it with a wireless communication module, and it is a preferred choice of the personal mobile wireless device to design the Antenna on a printed circuit board, and the current common Antenna design modes are a Monopole (Monopole) Antenna and a Planar Inverted-F Antenna (PIFA). However, either a monopole or PIFA antenna is an electric field antenna and is therefore very susceptible to dielectric material in the reactive near field, resulting in impedance variations and frequency misalignment. The built-in antenna generally suffers from the problem that the circuit board or metal element inside the mobile device destroys the radiation pattern of the antenna, which results in low radiation efficiency of the antenna in some directions or reduced radiation efficiency after the antenna is reduced in size.

Disclosure of Invention

An aspect of the present invention relates to an antenna for a wireless communication module, the antenna comprising: a feed-in part, a grounding part and a first radiation part. The grounding part has a first end and a second end, the first end of the grounding part is used for grounding, and the second end of the grounding part is connected to a first side of the feed-in part, wherein the grounding part comprises a bent part adjacent to the first end. The first radiation portion includes: the first adjusting arm is connected to the second adjusting arm, the first end of the first radiation part is connected to the second side of the feed-in part, the second side of the feed-in part is adjacent to the first side of the feed-in part, the second end of the first radiation part is arranged in the first adjusting arm, a gap is formed between the first adjusting arm and the bending part of the grounding part, and an included angle smaller than 90 degrees is formed between the second adjusting arm and the first adjusting arm.

Another aspect of the present invention relates to a wireless communication module having an antenna disposed on a surface of a substrate, the wireless communication module comprising: the antenna comprises a feed-in part, a grounding layer, a grounding part, a first radiation part and a second radiation part. The ground layer is located on the surface and adjacent to the feed-in portion. The ground portion has a first end and a second end, the first end of the ground portion is capacitively coupled to the ground layer, and the second end of the ground portion is connected to a first side of the feed portion, wherein the ground portion includes a bent portion adjacent to the first end. The first radiation section is used for transmitting or receiving a signal of a first frequency band and includes: first adjustment arm, second adjustment arm, first end and second end. The first adjustment arm is connected to the second adjustment arm. The first end of the first radiation part is connected to the second side of the feed-in part, and the second side of the feed-in part is adjacent to the first side of the feed-in part. The second end of the first radiation part is arranged in the first adjusting arm, a gap is arranged between the first adjusting arm and the bending part of the grounding part, and an included angle smaller than 90 degrees is formed between the second adjusting arm and the first adjusting arm. The second radiation part is used for transmitting or receiving signals of a second frequency band and is connected to a third side of the feed part, wherein the first frequency band is different from the second frequency band.

Drawings

Fig. 1 is a diagram illustrating a wireless communication module with an antenna according to an embodiment of the invention.

Fig. 2 shows a block diagram of an antenna of the wireless communication module of fig. 1.

Fig. 3 shows a current flow diagram of an antenna of the wireless communication module of fig. 1.

Fig. 4 shows a reflection parameter diagram of the antenna for a wireless communication module of fig. 1.

Fig. 5 shows an efficiency diagram of the antenna for the wireless communication module of fig. 1 in the 2.4GHz band.

Fig. 6 shows an efficiency graph of the antenna for the wireless communication module of fig. 1 at a 5GHz band.

Detailed Description

The planar inverted-F antenna is applied to the wireless communication module, which can provide higher design variability, and in addition, because the planar inverted-F antenna has a grounding part, the electrostatic resistance of the planar inverted-F antenna is better than that of a monopole antenna, so that the planar inverted-F antenna is suitable for being realized on a substrate compared with the monopole antenna.

Fig. 1 shows a schematic diagram of an antenna 10 of a wireless communication module 1 according to an embodiment of the invention. Fig. 2 shows a block diagram of the antenna 10 of the wireless communication module 1 of fig. 1. The antenna 10 is disposed on a surface of a substrate 2 and includes: a feeding part 21, a grounding part 22, a first radiation part 24 and a second radiation part 28. The ground 22 has a first end 221 and a second end 222, the first end 221 of the ground 22 is capacitively coupled to the ground layer 12, the ground layer 12 is located on the same surface of the substrate 2 as the antenna 10, and the second end 222 of the ground is connected to the first side 211 of the feed 21, wherein the ground 22 includes a bend 23 adjacent to the first end 221.

As shown in fig. 1, a ground layer 12 with a larger area is generally formed on a substrate 2 of a wireless communication module, and another clearance area 13 (such as the clearance area 13 below fig. 1) is additionally planned according to requirements for use of another antenna. No other metal devices can be placed in the clearance area 11 to prevent the antenna 10 from interfering with other elements on the circuit board and affecting the transceiving characteristics of the antenna 10. However, in the development direction of wireless communication modules, more functions are required besides the requirement of being light, thin, small and small in size. In this way, although the electronic device may be reduced, not only the complexity of the circuit design is greatly increased to increase more functions, but also the number of components used is relatively increased, and even the corners of the circuit board may be required to be laid with the ground layer 12 to dispose the electronic components other than the antenna 10 according to the design requirements. Such changes may cause the clearance area 11 to be reduced, the electromagnetic interference problem to be more pronounced and the radiation capability of the antenna to be reduced, and the transceiving effect to be reduced accordingly. When the antenna 10 is covered by the metal component on the circuit board, not only the frequency characteristic of the antenna 10 is disordered, but also the radiation characteristic is interfered, and the antenna 10 cannot operate normally.

The present invention maintains the high efficiency of the antenna 10 by the design of the first radiating portion 24 and the grounding portion 22 while only a small headroom area needs to be reserved. As shown in fig. 2, the first radiation portion 24 is used for transmitting or receiving a signal of a first frequency band and includes: a first adjustment arm 25, a second adjustment arm 26, a first end 241, and a second end 242. The first adjustment arm 25 is connected to the second adjustment arm 26. The first end 241 is connected to the second side 212 of the feeding element 21, and the second side 212 of the feeding element 21 is adjacent to the first side 211 of the feeding element 21. The second end 242 of the first radiating portion 24 is located in the first adjusting arm 25, a gap 27 is formed between the first adjusting arm 25 and the bending portion 23 of the grounding portion 22, the first adjusting arm 25 is coupled to the bending portion 23 of the grounding portion 22 through the gap 27, and in an embodiment of the present invention, the first adjusting arm 25 is substantially parallel to a portion of the bending portion 23 of the grounding portion 22. In an embodiment of the present invention, the width of the gap 27 is less than 0.005 times of the wavelength corresponding to the first frequency band, for example: a gap of 0.004 times the wavelength. The second adjusting arm 26 and the first adjusting arm 25 form an included angle theta smaller than 90 degrees. By the gap 27, the efficiency of the antenna 10 in the first frequency band can be improved and the required resonance path in the first frequency band can be shortened.

The second radiation part 28 is used for transmitting or receiving signals of a second frequency band and is connected to a third side 213 of the feed part 21, wherein the first frequency band is different from the second frequency band. In an embodiment of the present invention, the second radiation portion 28 includes: a first portion 281 extending in a direction parallel to the direction of the third side 213 of the feeding part 21 and connected to the third side 213, and a second portion 282 connected to the first portion 281 and extending in a direction of the first radiation part 24. By extending the second radiating portion 28 in the opposite direction of the ground plane, the efficiency of the antenna 10 in the second frequency band can be improved.

Fig. 3 shows a current flow diagram of an antenna of the wireless communication module of fig. 1. The antenna comprises a feed point 31 and a ground point 32. As shown in fig. 3, a current path 33 of the antenna in the first frequency band flows from the grounding point 32, and the current path 33 is substantially equal to a quarter wavelength of the first frequency band. In an embodiment of the present invention, the first frequency band may be an application frequency band of 2.4 GHz. Wherein the current flows in the antenna corresponding to the first adjustment arm 25 in fig. 2 substantially in parallel with the flow of the bent portion 23 of the ground portion 22 and is coupled to each other through a gap. As also shown in fig. 3, the current path 34 of the antenna in the second frequency band flows from the grounding point 32, and the current path 34 is substantially equal to about a quarter wavelength of the second frequency band. In an embodiment of the invention, the second frequency band may be a 5GHz application frequency band.

Fig. 4 shows a reflection parameter diagram of the antenna applied to the wireless communication module of fig. 1. As shown in FIG. 4, line 41 is the S measured between 1GHz and 6.5GHz according to one embodiment of the invention₁₁The value of the reflection parameter. As shown in FIG. 4, the S is measured at 2.484GHz₁₁The reflection parameter can be as low as-13.13 dB, and the S is at 5.5GHz₁₁The reflection parameter can be as low as-12.34 dB.

Fig. 5 shows an efficiency chart of the antenna applied to the wireless communication module of fig. 1 in the 2.4GHz band. As shown in FIG. 5, line 51 is the value of the efficiency measured between 2.4GHz and 2.48GHz according to one embodiment of the invention.

Fig. 6 shows the efficiency of the antenna applied to the wireless communication module of fig. 1 in the 5GHz band. As shown in FIG. 6, line 61 is the value of the efficiency measured between 5.1GHz and 5.9GHz according to one embodiment of the invention.

The antenna applied to the wireless communication module of the present invention can sufficiently improve the efficiency of the antenna in the first frequency band and shorten the required resonant path in the first frequency band by coupling the first tuning arm end or the open stub (open stub) with the ground of the planar inverted-F antenna, and can further effectively utilize the clearance area of the antenna for designing the second resonant frequency of the antenna by the coupling gap of only 0.004 times of the resonant wavelength. In an embodiment of the present invention, the efficiency of the antenna in the first frequency band can be improved from 78% to 85%. In addition, in the second frequency band, the design of separating the tail end or the open stub of the second adjusting arm from the ground layer can sufficiently improve the efficiency of the antenna in the second frequency band. In an embodiment of the present invention, the efficiency of the antenna in the second frequency band can be improved by about 12%. In the invention, the radiating metal sheet used by the antenna and the ground layer are positioned on the same plane, so the thickness of the antenna can be controlled, and the overall size of the antenna is further reduced. And because the design of slot is not needed, the unnecessary parasitic capacitance coupling effect can be avoided to reduce the design complexity of the antenna. The problem that the traditional dual-frequency antenna is poor in efficiency or overlarge in size can be solved.

As used herein, and not otherwise defined, the terms "substantially", "substantially" and "about" are used to describe and contemplate minor variations. When used in conjunction with an event or circumstance, the terms can refer to the situation in which the event or circumstance occurs explicitly, as well as the situation in which the event or circumstance occurs in close approximation. For example, the term can refer to less than or equal to ± 10%, such as less than or equal to ± 5%, less than or equal to ± 4%, less than or equal to ± 3%, less than or equal to ± 2%, less than or equal to ± 1%, less than or equal to ± 0.5%, less than or equal to ± 0.1% or less than or equal to ± 0.05%.

Additionally, amounts, ratios, and other numerical values are sometimes presented herein in a range format. It is to be understood that such range format is used for convenience and brevity, and should be interpreted flexibly to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited.

While the invention has been described and illustrated with reference to specific embodiments thereof, such description and illustration are not intended to limit the invention. It will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the true spirit and scope of the invention as defined by the claims. The illustrations may not be drawn to scale. Due to manufacturing processes and tolerances, there may be a distinction between artistic renderings in the present disclosure and actual equipment. There may be other embodiments of the invention not specifically described. The specification and drawings are to be regarded in an illustrative rather than a restrictive sense. Modifications may be made to adapt a particular situation, material, composition of matter, method, or process to the objective, spirit and scope of the present invention. All such modifications are intended to fall within the scope of this claim. Although the methods disclosed herein have been described with reference to particular operations performed in a particular order, it should be understood that these operations may be combined, sub-divided, or reordered to form equivalent methods without departing from the teachings of the present disclosure. Accordingly, unless specifically indicated herein, the order and grouping of the operations is not a limitation of the present invention.

Claims

1. An antenna, comprising:

a feed-in part;

a ground portion having a first end and a second end, the first end of the ground portion being used for grounding, and the second end of the ground portion being connected to a first side of the feed portion, wherein the ground portion includes an arc-shaped bent portion adjacent to the first end;

a first radiating section including:

a first adjustment arm and a second adjustment arm, the first adjustment arm connected to the second adjustment arm, wherein the first adjustment arm extends in a first direction, the first direction and the second adjustment arm forming an included angle of less than 90 degrees;

a first end connected to a second side of the feed-in portion, the first side of the feed-in portion being adjacent to the second side of the feed-in portion,

a second end located on one side of the first adjustment arm parallel to the first direction, wherein a gap is provided between the second end and the arc-shaped bent portion of the ground portion, wherein the first adjustment arm is coupled with the arc-shaped bent portion of the ground portion through the gap, and wherein a distance between the arc-shaped bent portion and the ground portion is smaller than a distance between the arc-shaped bent portion and the feed-in portion.

2. The antenna of claim 1, further comprising:

a second radiation part connected to a third side of the feeding part.

3. The antenna of claim 2, wherein the first radiating portion is for transmitting or receiving signals of a first frequency band and the second radiating portion is for transmitting or receiving signals of a second frequency band, wherein the first frequency band is different from the second frequency band.

4. The antenna of claim 3, wherein the width of the gap is less than 0.005 times the wavelength corresponding to the first frequency band.

5. The antenna defined in claim 1 wherein the first adjustment arm is substantially parallel to a portion of the arcuate bend of the ground.

6. The antenna of claim 2, wherein the second radiating portion comprises:

a first portion extending in a direction parallel to the third side of the feeding part,

a second portion connected to the first portion and extending in a direction of the first radiating portion.

7. A wireless communication module having an antenna disposed on a surface of a substrate, the wireless communication module comprising:

a feed-in part;

a ground layer on a surface of the substrate and adjacent to the feed-in portion;

a ground portion having a first end and a second end, the first end of the ground portion being capacitively coupled to the ground layer and the second end of the ground portion being connected to a first side of the feed-in portion, wherein the ground portion includes an arcuate bend adjacent to the first end, a distance between the arcuate bend and the ground portion being less than a distance between the arcuate bend and the feed-in portion;

a first radiation section for transmitting or receiving a signal of a first frequency band and including:

a first end connected to a second side of the feed-in part, the first side of the feed-in part being adjacent to the second side of the feed-in part;

a second end located on one side of the first adjustment arm parallel to the first direction, the second end having a gap with the arc-shaped bent portion of the ground portion, wherein the first adjustment arm is coupled with the arc-shaped bent portion of the ground portion through the gap;

a second radiation part for transmitting or receiving a signal of a second frequency band and connected to a third side of the feed part, wherein the first frequency band is different from the second frequency band.

8. The wireless communication module with antenna of claim 7, wherein the width of the gap is less than 0.005 times the wavelength corresponding to the first frequency band.