TWI715399B - Antenna module and electronic device - Google Patents

Abstract

An antenna module including an antenna and an electromagnetic wave shielding layer is provided. The antenna has a ground portion. The electromagnetic wave shielding layer covers at least a part of the ground portion. In addition, an electronic device having the antenna module is also provided.

Description

Antenna module and electronic device

The present invention relates to an antenna module and an electronic device, and more particularly to an antenna module with an electromagnetic wave shielding layer and an electronic device with the antenna module.

In recent years, the operating speed of electronic devices such as smart phones, tablet PCs, and notebook computers has continued to increase, and the noise generated by electronic components in electronic devices has also continued to increase. increase. In detail, the electronic components in the electronic device usually generate electromagnetic waves during operation, and the electromagnetic waves will become noise that interferes with the antenna in the electronic device, resulting in a decrease in the ability of the antenna to transmit and receive signals.

Accordingly, many electronic devices are equipped with electromagnetic wave shielding structures on the electronic components to shield the electromagnetic waves emitted by the electronic components or to ground them. However, electronic devices with higher performance have more electronic components that generate a large amount of noise, so a large number of electromagnetic wave shielding structures need to be provided to shield these electronic components. However, this greatly increases the manufacturing cost of the electronic device.

The invention provides an antenna module, which has good signal transceiving capabilities and can reduce the manufacturing cost of an electronic device.

The present invention provides an electronic device whose antenna module has good signal receiving and sending capabilities and has a low manufacturing cost.

The antenna module of the present invention includes an antenna and an electromagnetic wave shielding layer. The antenna has a ground part. The electromagnetic wave shielding layer covers at least part of the grounding part.

The electronic device of the present invention includes a device body and an antenna module. The antenna module includes an antenna and an electromagnetic wave shielding layer. The antenna is disposed on the main body of the device and has a grounding portion. The electromagnetic wave shielding layer covers at least part of the grounding part.

In an embodiment of the present invention, the material of the aforementioned electromagnetic wave shielding layer is a wave-absorbing material.

In an embodiment of the present invention, the above-mentioned antenna further has a radiating part and a feeding part, and the electromagnetic wave shielding layer does not cover the radiating part and the feeding part.

In an embodiment of the present invention, the above-mentioned antenna is a loop antenna.

In an embodiment of the present invention, the current density of at least part of the grounding portion described above is less than the current density of other parts of the antenna.

Based on the above, in the present invention, the grounding part of the antenna is covered with an electromagnetic wave shielding layer, so as to reduce the degree to which the antenna is affected by noise. Therefore, there is no need to separately provide electromagnetic wave shielding structures on the multiple electronic components of the electronic device, and the manufacturing cost of the electronic device can be reduced.

FIG. 1 is a schematic top view of a partial structure of an electronic device according to an embodiment of the invention. Please refer to FIG. 1, the electronic device 100 of this embodiment includes a device main body 110 and an antenna module 120. The device main body 110 is, for example, the main body of a notebook computer or other kinds of electronic devices, which includes a casing 112, a main board 114 disposed in the casing 112, and a plurality of electronic components 116 disposed on the main board 114 (Two are shown schematically). The electronic component 116 may include a central processing unit (CPU), a graphics processing unit (GPU), etc., which are not limited in the present invention. The antenna module 120 is disposed in the housing 112 of the device main body 110 and adjacent to the motherboard 114. FIG. 1 only schematically illustrates the antenna module 120, and the specific structure of the antenna module 120 is described below.

Fig. 2 is a top view of the antenna module of Fig. 1. Fig. 3 is a plan view of the antenna of Fig. 2. 2 and 3, the antenna module 120 of this embodiment includes an antenna 122 and an electromagnetic wave shielding layer 124. The antenna 122 is disposed on the device main body 110 (shown in FIG. 1) and includes a radiating portion 122a, a feeding portion 122b, and a grounding portion 122c connected to each other. The electromagnetic wave shielding layer 124 covers the grounding portion 122c and does not cover the radiating portion 122a and the feeding portion 122b. The material of the electromagnetic wave shielding layer 124 is, for example, a non-conductive wave-absorbing material, which is disposed on the grounding portion 122c in a pasting manner, for example.

As described above, the ground portion 122c of the antenna 122 is covered with an electromagnetic wave shielding layer 124, which can reduce the degree to which the antenna 122 is affected by noise. Thereby, there is no need to separately provide electromagnetic wave shielding structures on the multiple electronic components 116 of the electronic device 100, and the manufacturing cost of the electronic device 100 can be reduced.

Furthermore, the antenna 122 of this embodiment is a loop antenna as shown in FIG. 2, which mainly excites the electromagnetic field by a time-varying current. The current is mostly concentrated at the radiating part 122a and the feeding part 122b, so that the ground part 122c is The current density is smaller than the current density of other parts of the antenna 122. Therefore, covering the electromagnetic wave shielding layer 124 on the grounding portion 122c instead of covering the radiating portion 122a and the feeding portion 122b can prevent the arrangement of the electromagnetic wave shielding layer 124 from reducing the signal reception efficiency of the antenna 122. In addition, the grounding portion 122c usually has a large-area metal plane. When the electromagnetic wave shielding layer 124 is not used to cover the grounding portion 122c, the grounding portion 122c is likely to have a near-field capacitive coupling effect with the metal components in the device body 110, and the electronic components A large amount of noise generated by 116 is transmitted to antenna 122. Therefore, the electromagnetic wave shielding layer 124 is covered on the grounding portion 122c as described above, which will not excessively affect the normal function of the antenna 122, and can greatly reduce the adverse effect of noise on the antenna 122.

FIG. 4 shows that the heat dissipation structure is disposed above the antenna module of FIG. 1. For example, as shown in FIG. 4, when the heat dissipation structure 118 (for example, a heat dissipation fin group and/or a heat pipe) is disposed above the antenna module 120, if the electromagnetic wave shielding layer 124 is not used to cover the ground portion 122c, then The large-area ground portion 122c is likely to produce a near-field capacitive coupling effect with the heat dissipation structure 118 as described above, which affects the normal function of the antenna 122. As shown in FIG. 2, the electromagnetic wave shielding layer 124 is disposed on the ground portion 122c, which can effectively suppress the generation of the near-field capacitive coupling effect.

In other embodiments, the coverage of the electromagnetic wave shielding layer 124 on the grounding portion 122c can be determined based on the actual measurement of the current distribution of the antenna 122. For example, if a partial area of the ground portion 122c has a higher current density, the electromagnetic wave shielding layer 124 may only cover the area of the ground portion 122c with a lower current density.

In this embodiment, the electromagnetic wave shielding layer 124 is, for example, a wave absorbing material with a magnetic permeability of about 110, and its thickness is, for example, about 2 mm. However, the present invention is not limited to this, and the electromagnetic wave shielding layer 124 may have other appropriate magnetic permeability and thickness.

Table 1 lists the specific distance (such as 25 meters) of the antenna 122 in each direction (directions D1~D4 shown in Figure 4) when the electromagnetic wave shielding layer 124 is not provided and the electromagnetic wave shielding layer 124 is provided. The signal strength and signal transmission/reception speed at the location. As shown in Table 1, the signal strength of the antenna 122 is not reduced by the configuration of the electromagnetic wave shielding layer 124, and the signal transmission/reception speed of the antenna 122 is significantly improved by the configuration of the electromagnetic wave shielding layer 124. direction Distance (meters) No electromagnetic wave shielding layer With electromagnetic wave shielding layer Signal strength (dBm) Transmission speed (Mbps) Receiving speed (Mbps) Signal strength (dBm) Transmission speed (Mbps) Receiving speed (Mbps) D1 25 -62.0 9.2 7.5 -62.0 16.5 12.7 D2 25 -71.0 1.1 0.5 -71.0 2.4 2.1 D3 25 -59.0 18.7 11.4 -59.0 19.9 16.8 D4 25 -67.0 2.9 2.2 -67.0 10.4 5.7 Table 1

FIG. 5 is a comparison diagram of the noise intensity of the antenna with and without the electromagnetic wave shielding layer, where A corresponds to the electromagnetic wave shielding layer 124 not provided, and B corresponds to the electromagnetic wave shielding layer 124 provided. As shown in FIG. 5, after the electromagnetic wave shielding layer 124 is provided, the noise intensity received by the antenna 122 in the 2.4 GHz frequency band is reduced by about 5 dBm.

In summary, in the present invention, the grounding part of the antenna is covered with an electromagnetic wave shielding layer, so as to reduce the degree to which the antenna is affected by noise. Therefore, there is no need to separately provide electromagnetic wave shielding structures on the multiple electronic components of the electronic device, and the manufacturing cost of the electronic device can be reduced.

100: electronic device 110: Device body 112: Chassis 114: Motherboard 116: electronic components 118: heat dissipation structure 120: Antenna Module 122: Antenna 122a: Radiation Department 122b: Infeed 122c: Grounding part 124: Electromagnetic wave shielding layer D1~D4: Direction

FIG. 1 is a schematic top view of a partial structure of an electronic device according to an embodiment of the invention. Fig. 2 is a top view of the antenna module of Fig. 1. Fig. 3 is a plan view of the antenna of Fig. 2. FIG. 4 shows that the heat dissipation structure is disposed above the antenna module of FIG. 1. Fig. 5 is a comparison diagram of the noise intensity of an antenna with and without an electromagnetic wave shielding layer.

120: Antenna Module

122: Antenna

122a: Radiation Department

122b: Infeed

122c: Grounding part

124: Electromagnetic wave shielding layer

Claims (8)

An antenna module includes: an antenna with a grounding part; and an electromagnetic wave shielding layer covering at least a part of the grounding part, wherein the electromagnetic wave shielding layer is made of a non-conductive wave absorbing material. For the antenna module described in the first item of the patent application, the antenna further has a radiating part and a feeding part, and the electromagnetic wave shielding layer does not cover the radiating part and the feeding part. The antenna module as described in item 1 of the scope of patent application, wherein the antenna is a loop antenna. According to the antenna module described in claim 1, wherein the current density of the at least part of the grounding portion is smaller than the current density of other parts of the antenna. An electronic device, including: a device main body; and an antenna module, including: an antenna disposed on the device main body and having a grounding portion; and an electromagnetic wave shielding layer covering at least part of the grounding portion, wherein the electromagnetic wave The material of the shielding layer is a non-conductive absorbing material. For the electronic device described in item 5 of the scope of patent application, the antenna further has a radiating part and a feeding part, and the electromagnetic wave shielding layer does not cover the radiating part and the feeding part. The electronic device described in item 5 of the scope of patent application, wherein the antenna is a loop antenna. According to the electronic device described in item 5 of the scope of patent application, the current density of the at least part of the grounding portion is less than the current density of other parts of the antenna.

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