TWI606639B - Antenna module - Google Patents

Description

Antenna module

The present invention relates to an antenna module, and more particularly to an antenna module for a portable electronic device.

Due to the increasing quality, reliability and transmission speed requirements of wireless communication signals, multi-antenna systems, such as the Pattern Switchable or Beam-Steering Antenna system or multi-input multi-output antennas (Multi-input Multi-) Output Antenna, MIMO) Development of system technology. For example, MIMO antenna technology has been successfully applied in products such as notebook computers, handheld communication devices or Wireless Access Point.

The use of multiple input multiple output (MIMO) antenna systems is to solve the problem of antenna multipath attenuation. However, due to the fact that wireless products on the market are light and easy to carry, the volume tends to become smaller and smaller, which will make the antenna and antenna too close. The isolation between the antennas is reduced, making the fundamental frequency signal processing difficult, the transmission speed becoming low, and the destructive interference between the antennas causing the gain to decrease.

The present invention provides an antenna module suitable for portable electronic devices. The antenna module includes a heat dissipating component, a first antenna, and a second antenna. The heat dissipating component contacts at least one heat source of the portable electronic device. The first antenna is disposed on one side of the heat dissipating component, and the second antenna is disposed on the other side of the heat dissipating component. The heat dissipating component has a groove and the groove has at least one bend. An orthographic projection of at least one of the first antenna and the second antenna on a projection surface of the heat dissipating component partially overlaps an orthographic projection of the trench on the projection surface.

Based on the above, the antenna module is disposed on the heat dissipating component by disposing the first antenna and the second antenna, thereby moving the antenna away from the circuit board in the portable electronic device. At the same time, the heat dissipating component is formed with at least one bent groove, and one of the first antenna and the second antenna is overlapped with the orthographic projection part of the trench, so that an electromagnetic barrier can be formed between the two antennas. According to to improve the isolation between the antennas.

In order to make the above features and advantages of the present invention more comprehensible, the following embodiments are described in detail with reference to the accompanying drawings.

1 is a schematic diagram of an application of an antenna module according to a first embodiment of the present invention to show a partial state of an antenna module in a portable electronic device. 2 is a top plan view of the antenna module of FIG. 1. Referring to FIG. 1 and FIG. 2 , in the embodiment, the antenna module 100 is applicable to at least one heat source 20 of the portable electronic device, and the antenna module 100 includes a first antenna 110 , a second antenna 120 , and Heat sink element 130. The heat source 20 of the portable electronic device is, for example, a processor (or a display chip) disposed in the notebook computer. However, the embodiment does not limit this. The heat dissipating component 130 is, for example, a metal foil or fin structure that contacts the heat source 20 to dissipate heat therefrom.

The first antenna 110 and the second antenna 120 are multi-input multi-output (MIMO) antennas having the same band. In an embodiment, the first antenna 110 and the second antenna The line 120 is a MIMO antenna of the ISM (Industrial Scientific Medical) band, wherein the first antenna 110 is overlapped with one side of the heat dissipating component 130 by its connecting portion 112, and the second antenna 120 is overlapped by the connecting portion 122 thereof. The other side of the heat dissipating component 130, and because the heat dissipating component 130 is electrically conductive, the first antenna 110 and the second antenna 120 can be grounded. Here, the connecting portions 112 and 122 are, for example, conductive foils or elastic sheets.

In this embodiment, the antenna module 100 further includes a member 150. The heat dissipating component 130 is adapted to be disposed on the component 150 to be in thermal contact with the heat source 20, where the component 150 can be another heat dissipating component (ie, the aforementioned metal foil or There is a gap 160 between the heat dissipating member 130 and the member 150. In this embodiment, the gap 160 may be filled with a conductive medium such as an electrically conductive thermally conductive paste or a conductive foam.

3 is a schematic diagram of an application of an antenna module according to a second embodiment of the present invention. In this embodiment, the component 650 is a printed circuit board (such as a motherboard in a notebook computer), and the heat dissipating component 130 is directly in contact with a processor or display chip (ie, heat source 30) disposed on the printed circuit board. An air gap 660 is maintained between the heat dissipating component 130 and the member 650. Accordingly, since the antenna does not need to be disposed on the motherboard, the space utilization of other electronic components on the motherboard can be improved.

Referring to FIG. 1 and FIG. 2 again, the heat dissipating component 130 has at least one trench 140, and the trench 140 has at least one bend, and at least one of the first antenna 110 and the second antenna 120 is at the heat dissipating component 130. The orthographic projection on the projection plane P1 partially overlaps the orthographic projection of the trench 140 on the projection plane P1. As shown in FIG. 2, the orthographic projection of the second antenna 120 on the projection surface P1 is completely overlapped with the first segment S1 of the trench 140, and the front projection of the first antenna 110 on the projection surface P1 is The first segment S1 of the trench 140 partially overlaps. Here, the projection surface P1 is a normal plane of the main surface of the heat dissipating component 130, and the first segment S1 of the trench is located on the projection surface P1. Accordingly, the isolation between the first antenna 110 and the second antenna 120 can be effectively improved by forming the trench 140 in the heat dissipation element 130. In other embodiments, the orthographic projection of at least one of the first antenna and the second antenna may be overlapped with the orthographic projection of the second segment S2 by appropriate configuration.

In an embodiment, the relative distance between the first antenna 110 and the second antenna 120 is less than 1λ, where λ is the wavelength of the resonant frequency band (eg, 2.4 GHz) of the first antenna 110 and the second antenna 120, and thus By the presence of the trenches 140, the electromagnetic waves generated by the first antenna 110 and the second antenna 120 are sufficiently disturbed by the electromagnetic effect to improve the isolation and communication quality between the antennas, wherein the trenches are improved. The length of 140 (the sum of the first segment S1 and the second segment S2) is 0.2λ to 0.4λ. In other words, also because the trench 140 can form a capacitive load, the electric field disturbance generated by it can be shared by the first antenna 110 and the second antenna 120, thereby reducing the resonance length of the two, that is, equivalent It is possible to reduce the volume (space) it occupies, and the first antenna 110 and the second antenna 120 are more suitable for a smaller space. In this way, the portable electronic device of the embodiment can move toward a thinner, lighter and shorter design.

4 is a comparison diagram of the isolation between the antenna module of the present invention and the existing antenna module. The curve T1 is the antenna module of the embodiment, and the curve T2 is a conventional antenna module. Referring to FIG. 4, as described above, the antenna module 100 is disposed on the heat dissipating component 130 and has the trench 140 as an electromagnetic wave isolating component, so that the isolation between the first antenna 110 and the second antenna 120 is less than -15 (dB) or -20 (dB), even in the required frequency bands, such as 2.4 GHz to 2.6 GHz or 5 GHz to 5.6 GHz, the effect of better isolation is more pronounced. Taking the multiple input multiple output (MIMO) antenna of the present embodiment as an example, it is preferable to maintain isolation of less than -30 (dB) between each antenna.

The different configurations of the heat dissipating component and the first antenna and the second antenna in different embodiments of the present invention are described below, which can also achieve the above-mentioned isolation effect.

FIG. 5 and FIG. 6 are respectively top views of the antenna module of the third and fourth embodiments of the present invention. Referring to FIG. 5, FIG. 6 and FIG. 2, the difference from the previous embodiment is that the opposite ends (the first end 142, the second end 144) of the trench 140 shown in the embodiment of FIG. 2 are all open. And the open position of the first end 142 is located at the junction of the connecting portion 112 of the first antenna 110 and the heat dissipating component 130, that is, the trench 140 is considered to be at the first end 142 and the first antenna 110 is intersected. The second end 144 of the trench 140 is located at the first antenna 110 and the second antenna 120 opposite the heat dissipating component 130. In contrast, the embodiment of FIG. 5 is such that the second end 244 of the trench 240 of the heat dissipating component 230 is in a closed state, while the embodiment of FIG. 6 is such that the first end 342 of the trench 340 of the heat dissipating component 330 is Closed state.

FIG. 7 is a top plan view of an antenna module according to a fifth embodiment of the present invention. Referring to FIG. 7 and FIG. 2, in contrast to the foregoing embodiment, in the embodiment shown in FIG. 2, the trench 140 has only one bend, and the first antenna 110 and the second antenna 120 are located at the heat dissipating component 130. The opposite side; while in FIG. 7, the first antenna 110 and the second antenna 120 are located on adjacent sides of the heat dissipating member 430, and thus the groove 440 disposed on the heat dissipating member 430 has two bends, thereby Increasing the isolation between the antennas to overcome the mutual interference of the electromagnetic waves may be caused by the antennas moving closer to each other.

FIG. 8 is a top plan view of an antenna module according to a sixth embodiment of the present invention. Referring to FIG. 8 and FIG. 2 and FIG. 7, in the embodiment shown in FIG. 2, the heat dissipating components are divided into different regions A1 and A2 by the grooves, and the first antenna 110 and the second antenna 120 are separated. In the same area A2 of the heat dissipating component 130, the heat dissipating component of the embodiment shown in FIG. 7 is similarly divided into different regions A3 and A4 by the trench 440, wherein the first antenna 110 and the second antenna 120 are Connected to the same area A3. In contrast, in FIG. 8, the heat dissipating elements 530 are divided into different areas A5 and A6 by the grooves 540, and the first antenna 110 is disposed in the area A5 and the second antenna is disposed in the area A6. Moreover, in the embodiment, the first end 542 and the second end 544 of the trench are both open ends, and the open end of the first end 542 can be regarded as a state of intersection with the first antenna 110.

In summary, in the above embodiment of the present invention, the antenna module does not need to be disposed on the heat dissipating component by respectively connecting the first antenna and the second antenna of the multiple input multiple output (MIMO) antenna. The circuit board of the portable electronic device can also improve the space utilization of the electronic components on the circuit board. At the same time, the heat dissipating component has electrical conductivity, so in addition to providing a grounding effect, a groove is formed on the heat dissipating component, so that an electromagnetic shielding effect can be generated between the antennas to increase the isolation between the antennas. The trenches, the first antenna and the second antenna may have different configurations according to requirements, so that the antenna module can have better isolation at the ISM band.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the content of the present invention. Anyone having ordinary knowledge in the technical field can make some changes and refinements without departing from the spirit and scope of the present case. The scope of protection is subject to the definition of the scope of the patent application.

20, 30‧‧‧ heat source
100‧‧‧Antenna Module
110‧‧‧first antenna
112‧‧‧Connecting Department
120‧‧‧second antenna
122‧‧‧Connecting Department
130, 230, 330, 430, 530‧‧ ‧ heat dissipation components
140, 240, 340, 440, 540‧‧‧ trenches
142, 342, 442, 542‧‧‧ first end
144, 244‧‧‧ second end
150, 650‧‧‧ components
160‧‧‧ gap
660‧‧‧ air gap
A1, A2, A3, A4, A5, A6‧‧‧ areas
P1‧‧‧projection surface
S1‧‧‧ first paragraph
S2‧‧‧ second paragraph
T1, T2‧‧‧ curve

1 is a schematic diagram of an application of an antenna module according to a first embodiment of the present disclosure. 2 is a top plan view of the antenna module of FIG. 1. 3 is a schematic diagram of an application of an antenna module according to a second embodiment of the present invention. FIG. 4 is a diagram showing the isolation of the antenna module of the present invention and the existing antenna module. FIG. 5 and FIG. 6 are respectively top views of the antenna module of the third and fourth embodiments of the present invention. FIG. 7 is a top plan view of an antenna module according to a fifth embodiment of the present invention. FIG. 8 is a top plan view of an antenna module according to a sixth embodiment of the present invention.

100‧‧‧Antenna Module

110‧‧‧first antenna

112, 122‧‧‧ Connections

120‧‧‧second antenna

130‧‧‧Heat components

140‧‧‧ trench

142‧‧‧ first end

144‧‧‧ second end

A1, A2‧‧‧ area

P1‧‧‧projection surface

S1‧‧‧ first paragraph

S2‧‧‧ second paragraph

Claims (11)

An antenna module is applicable to a portable electronic device, the antenna module includes: a heat dissipating component contacting at least one heat source of the portable electronic device; and a first antenna disposed on one side of the heat dissipating component And a second antenna disposed on the other side of the heat dissipating component, wherein the heat dissipating component has at least one trench, the trench has at least one bend, and the first antenna and the second antenna At least one of the orthographic projections on a projection surface of the heat dissipating component partially overlaps an orthographic projection of the trench on the projection surface. The antenna module of claim 1, wherein the heat dissipating component is electrically conductive. The antenna module of claim 1, wherein a relative distance between the first antenna and the second antenna is less than 1λ, and λ is a resonant frequency band of the first antenna and the second antenna. wavelength. The antenna module of claim 1, wherein the length of the trench is 0.2λ to 0.4λ, and λ is a wavelength of a resonant frequency band of the first antenna and the second antenna. The antenna module of claim 1, wherein the first antenna and the second antenna are on opposite sides or adjacent sides of the heat dissipating component. The antenna module of claim 1, wherein the trench divides the heat dissipating component into two regions, and the first antenna and the second antenna overlap the same region or different regions. The antenna module of claim 1, wherein the first antenna and the second antenna are multiple input/multiple outputs (Multi-input Multi--) with an ISM (Industrial Scientific Medical) band, respectively. Output, MIMO) antenna. The antenna module of claim 1, wherein at least one of the two ends of the trench is in a closed state or an open state. The antenna module of claim 1, further comprising: a member disposed on the member and maintaining a gap with the member. The antenna module of claim 9, wherein the component is another heat dissipating component or a circuit board. The antenna module of claim 9, wherein the gap is filled with a conductive medium.