TWM654394U - Compact open slot antenna device - Google Patents

Abstract

The present invention provides a micro slotted antenna device, comprising a dielectric substrate having a first long side, a second long side, a first short side and a second short side, and having a first surface and a second surface opposite to each other; a patterned metal layer is located on the second surface to form a slot on the second surface through the patterned metal layer; a T-shaped feeding metal branch is located on the first surface, and the vertical projection of the T-shaped feeding metal branch overlaps with the slot. A coupling metal branch is located on the first surface, one end of the coupling metal branch is located on the first short side of one side of the T-shaped feeding metal branch, and the other end is bent and extends along the first long side, so that there is a distance between the coupling metal branch and the T-shaped feeding metal branch. A signal source is located on the first surface and connected to the T-shaped feeding metal branch to transmit and receive a radio frequency signal.

Description

Micro slotted antenna device

This case is about a micro slotted antenna device suitable for 2.4/5/6 GHz frequency bands for Wi-Fi 7 operation.

The development trend in current laptops has limited the space for antenna integration, making antenna design very challenging. In order to ensure reliable communication between the transmitter and the receiver, the antenna needs to be miniature and have optimal radiation characteristics. In addition, the antenna operating frequency band includes the 6 GHz (5925-7125 MHz) band in addition to the 2.4 GHz (2400-2484 MHz) and 5 GHz (5150-5895 MHz) bands, making the design of an antenna that can cover these three bands even more challenging.

Low-cost planar antennas are commonly used in laptop applications, and most of these antennas have large physical footprints, making them difficult to integrate into the latest laptops. In addition, in order to achieve antenna miniaturization, antenna designs usually use lumped element designs, but the efficiency and gain of these antennas often drop significantly, which cannot meet the current mainstream requirements of antennas to meet both size and efficiency.

The present invention provides a micro slot antenna device, comprising a dielectric substrate, a patterned metal layer, a slot, a T-shaped feeding metal branch, a coupling metal branch and a signal source. In the micro slot antenna device, the dielectric substrate has a first long side and a second long side opposite to each other, and a first short side and a second short side opposite to each other, and the dielectric substrate has a first surface and a second surface opposite to each other. The patterned metal layer is located on the second surface of the dielectric substrate to form a slot on the second surface through the patterned metal layer. The T-shaped feeding metal branch is located on the first surface of the dielectric substrate, and the vertical projection of the T-shaped feeding metal branch overlaps with the slot. The coupling metal branch is located on the first surface of the dielectric substrate, one end of the coupling metal branch is located on the first short side of one side of the T-shaped feeding metal branch, and the other end of the coupling metal branch is bent and extends along the first long side, so that there is a distance between the coupling metal branch and the T-shaped feeding metal branch. The signal source is located on the first surface of the dielectric substrate and connected to the T-shaped feeding metal branch to transmit and receive a radio frequency signal.

In summary, this case is a micro slotted antenna device, which uses a dual-plane antenna structure to achieve a miniaturized structural design, so that the micro slotted antenna device has a structural design with a smaller physical footprint and optimal antenna radiation efficiency. Therefore, the micro slotted antenna device proposed in this case is actually a structural design with a small physical footprint and high miniaturization, and can simultaneously achieve the effect of antenna miniaturization and improve the overall antenna radiation efficiency without using lumped elements.

The following will be used in conjunction with the relevant drawings to illustrate the embodiments of the present invention. In addition, the drawings in the embodiments omit some components or structures to clearly show the technical features of the present invention. In these drawings, the same reference numerals represent the same or similar components or circuits. It must be understood that although the terms "first", "second", etc. may be used in this article to describe various components, parts, regions or functions, these components, parts, regions and/or functions should not be limited by these terms. These terms are only used to separate one component, component, region or function from another component, component, region or function.

Please refer to FIG. 1 and FIG. 2 , a micro slot antenna device 10 includes a dielectric substrate 12 , a patterned metal layer 14 , an open slot 16 , a T-shaped feeding metal branch 18 , a coupling metal branch 20 , and a signal source 22 .

As shown in FIG. 1 and FIG. 2 , in the micro slotted antenna device 10, the dielectric substrate 12 includes a first long side 121 and a second long side 122 opposite to each other and a first short side 123 and a second short side 124 opposite to each other, and the first short side 123 connects the same side of the first long side 121 and the second long side 122, and the second short side 124 connects the other same side of the first long side 121 and the second long side 122. In addition, the dielectric substrate 12 has a first surface 125 and a second surface 126 opposite to each other. The dielectric substrate 12 may be a hard board (such as FR4) or a soft board (such as FPC). In one embodiment, the dielectric substrate 12 is a FR4 substrate with a thickness of 0.4 mm, a dielectric constant of 4.4, and a loss tangent of 0.025.

As shown in Figures 1 and 2, the patterned metal layer 14 is located on the second surface 126 of the dielectric substrate 12, so as to form a groove 16 on the second surface 126 through the patterned metal layer 14, wherein the patterned metal layer 14 is continuously arranged along the first long side 121, the first short side 123 and the second long side 122 to present a U-shaped structure to form the groove 16, and the opening of the groove 16 is located at the second short side 124. The T-shaped feeding metal branch 18 is located on the first surface 125 of the dielectric substrate 12, and the vertical projection of the T-shaped feeding metal branch 18 overlaps with the slot 16, wherein the T-shaped feeding metal branch 18 includes a horizontal metal segment 181 and a vertical metal segment 182, and one end of the vertical metal segment 182 is connected to the horizontal metal segment 181. The coupling metal branch 20 is located on the first surface 125 of the dielectric substrate 12, one end of the coupling metal branch 20 is located at the first short side 123 of one side of the T-shaped feeding metal branch 18, and the other end of the coupling metal branch 20 is bent and extends along the first long side 121, so that there is a distance d between the coupling metal branch 20 and the T-shaped feeding metal branch 18. In one embodiment, one end of the coupling metal branch 20 is located at the first short side 123, and the other end is first bent to extend a short distance toward the second short side 124, then bent to extend toward the first long side 121, and finally bent to be arranged along the first long side 121, so that there is a distance d between the coupling metal branch 20 arranged along the first long side 121 and the horizontal metal section 181 of the T-type feeding metal branch 18. The length of the coupling metal branch 20 will affect the coupling amount between the T-type feeding metal branch 18 and the slot 16 and the coupling amount between the T-type feeding metal branch 18 and the coupling metal branch 20, so that the resonance frequency and current distribution mode of the entire micro slot antenna device 10 will also change with the change of the coupling amount. The signal source 22 is located on the first surface 125 of the dielectric substrate 12 and connected to the T-shaped feeding metal branch 18, so that one end of the vertical metal segment 182 of the T-shaped feeding metal branch 18 is connected to the horizontal metal segment 181, and the other end is connected to the signal source 22, so as to transmit and receive an RF signal through the signal source 22.

In one embodiment, the micro slot antenna device 10 further includes a grounding portion 24, which is located on the first surface 125 of the dielectric substrate 12. Two ends of the grounding portion 24 are respectively adjacent to the first short side 123 and the second short side 124 and are disposed along the second long side 122, so that one end of the signal source 22 is connected to the vertical metal segment 182 of the T-shaped feed metal branch 18, and the other end is connected to the grounding portion 24. In one embodiment, the signal source 22 is connected to a system communication module of an electronic device (not shown) through a coaxial transmission line, a planar transmission line, or a combination of the two to transmit and receive wireless signals. Furthermore, the patterned metal layer 14 is further electrically connected to the ground portion 24 through a metal strip (eg, copper strip) or at least one metal via (not shown).

Please refer to FIG. 3 , the micro slotted antenna device 10 is disposed on a metal frame 26 of a display device of an electronic device (not shown), and the length and width of the micro slotted antenna device 10 are only 15 mm * 4.6 mm, wherein the second long side 122 of the dielectric substrate 12 is adjacent to the metal frame 26 of the display device, so that the grounding portion 24 is electrically connected to the metal frame 26.

In one embodiment, the aforementioned electronic device is a mobile phone, a personal digital assistant, a tablet computer, a notebook computer, etc., but the present invention is not limited thereto, and any portable electronic device with mobile communication function is covered in the present invention. As shown in FIG. 3 , the electronic device is a notebook computer as an example, and the dielectric substrate 12 of the micro slotted antenna device 10 and the components thereon are disposed on the metal frame 26 of the display device.

Referring to FIG. 4 and FIG. 5 , in another embodiment, a micro slotted antenna device 10 also includes a dielectric substrate 12, a patterned metal layer 14, a slot 16, a T-shaped feeding metal branch 18, a coupling metal branch 20, and a signal source 22. The coupling metal branch 20 has a different structural design. In this embodiment, one end of the coupling metal branch 20 is parallel to the second long side 122, and the other end is first bent and extended along the first short side 123, and then bent and arranged along the first long side 121, so that there is a distance d between the coupling metal branch 20 arranged along the first long side 121 and the horizontal metal segment 181 of the T-shaped feeding metal branch 18. The remaining structures and connection relationships are the same as those of the embodiments described in FIG. 1 and FIG. 2 , and thus will not be described in detail here.

In one embodiment, as shown in FIG. 1 , a patterned metal layer 14, a T-shaped feed metal branch 18 (including a horizontal metal segment 181 and a vertical metal segment 182), a coupling metal branch 20, and a grounding portion 24 are made of conductive metal materials, such as silver, copper, aluminum, iron, or alloys thereof, but the present invention is not limited thereto.

Please refer to FIG. 1 and FIG. 2 . In the micro slot antenna device 10 , the slot 16 is coupled and excited by the T-type feeding metal branch 18 , so that the T-type feeding metal branch 18 and the slot 16 are responsible for exciting a first operating mode. The center frequency of the first operating mode is about 2.4 GHz. By adjusting the size (length and width) of the coupling metal branch 20 , the size of the slot 16 , and the position where the vertical projection of the T-type feeding metal branch 18 overlaps with the slot 16 , the frequency and matching of the first operating mode can be adjusted. The coupling metal branch 20 is excited by the coupling of the T-type feeding metal branch 18, so that the T-type feeding metal branch 18 and the coupling metal branch 20 are responsible for exciting a second operating mode, and the center frequency of the second operating mode is about 5 GHz. By adjusting the size (length and width) of the coupling metal branch 20 and the size of the slot 16, the frequency and matching of the second operating mode can be adjusted. The T-type feeding metal branch 18 is responsible for exciting a third operating mode, and the center frequency is about 6 GHz. The size of the T-type feeding metal branch 18, the vertical projection and the overlapping position of the slot 16 will also affect the frequency and matching of the third operating mode. Based on this, through the aforementioned first operating mode, second operating mode and third operating mode, without increasing the size of the antenna, the operating bandwidth of the micro slotted antenna device 10 of the present case can meet the three-band operating range of Wi-Fi 7, such as 2.4/5/6 GHz (2400~2484/5150~5895/5925~7125 MHz).

The micro slot antenna device 10 proposed in this case does have a good reflection coefficient. Please refer to FIG. 1, FIG. 2, FIG. 3 and FIG. 6 at the same time. In this micro slot antenna device 10, the length and width of the micro slot antenna device 10 located on the dielectric substrate 12 are 15 mm * 4.6 mm. When the micro slot antenna device 10 is used to transmit radio frequency signals, the S parameter (reflection coefficient) simulation analysis is performed. When the micro slotted antenna device 10 is in the low-frequency operating band and the high-frequency operating band, its S-parameter simulation results are shown in FIG6 . From the curves shown in FIG6 , it can be seen that in the low-frequency operating band (2.4 GHz) and the high-frequency operating band (5/6 GHz), the reflection coefficients shown in the graph are both less than -6 dB, which proves that the micro slotted antenna device 10 has good impedance matching in the low-frequency operating band (first operating mode) and the high-frequency operating band (second operating mode and third operating mode), and can meet the three-band range of WiFi 7 of 2400-2484 MHz, 5150-5895 MHz and 5925-7125 MHz.

Furthermore, as shown in Figures 1 and 2, the schematic diagrams of the 2D field patterns of the micro slot antenna device 10 in each plane at 2445 MHz are shown in Figures 7A, 7B and 7C, the schematic diagrams of the 2D field patterns of the micro slot antenna device 10 in each plane at 5240 MHz are shown in Figures 8A, 8B and 8C, and the schematic diagrams of the 2D field patterns of the micro slot antenna device 10 in each plane at 6400 MHz are shown in Figures 9A, 9B and 9C. It can be seen from these figures that the radiation pattern of the entire electric field of the micro slot antenna device 10 in the 2.4/5/6 GHz operating frequency band of WiFi 7 is omnidirectional, indicating that the performance at any angle is quite good.

In summary, this case is a micro slotted antenna device, which uses a dual-plane antenna structure to achieve a miniaturized structural design, so that the micro slotted antenna device has a structural design with a smaller physical footprint and optimal antenna radiation efficiency. Therefore, the micro slotted antenna device proposed in this case is actually a structural design with a small physical footprint and high miniaturization, and can simultaneously achieve the effect of antenna miniaturization and improve the overall antenna radiation efficiency without using lumped elements. Therefore, the micro slotted antenna device with a small physical footprint in this case can effectively support the 2.4/5/6 GHz frequency bands, and easily meet the bandwidth requirements required by the latest Wi-Fi 7.

The embodiments described above are only for illustrating the technical ideas and features of this case. Their purpose is to enable those familiar with this technology to understand the content of this case and implement it accordingly. They cannot be used to limit the patent scope of this case. In other words, any equivalent changes or modifications made according to the spirit disclosed in this case should still be covered by the scope of the patent application of this case.

10: Micro slotted antenna device 12: Dielectric substrate 121: First long side 122: Second long side 123: First short side 124: Second short side 125: First surface 126: Second surface 14: Patterned metal layer 16: Slots 18: T-type feed metal branch 181: Horizontal metal segment 182: Vertical metal segment 20: Coupling metal branch 22: Signal source 24: Grounding 26: Metal frame d: Spacing

FIG. 1 is a schematic diagram of the front structure of a micro slotted antenna device according to an embodiment of the present invention. FIG. 2 is a schematic diagram of the back structure of a micro slotted antenna device according to an embodiment of the present invention. FIG. 3 is a schematic diagram of the structure of a micro slotted antenna device according to an embodiment of the present invention installed on a display device. FIG. 4 is a schematic diagram of the front structure of a micro slotted antenna device according to another embodiment of the present invention. FIG. 5 is a schematic diagram of the back structure of a micro slotted antenna device according to another embodiment of the present invention. FIG. 6 is a schematic diagram of the S parameter simulation of the micro slotted antenna device according to an embodiment of the present invention in an operating state. FIG. 7A is a schematic diagram of the 2D field pattern of the micro slotted antenna device according to an embodiment of the present invention in the X-Y plane at 2445 MHz. FIG. 7B is a schematic diagram of the 2D field pattern of the micro slotted antenna device according to an embodiment of the present invention in the X-Z plane at 2445 MHz. FIG. 7C is a schematic diagram of the 2D field pattern of the micro slotted antenna device according to an embodiment of the present invention in the Y-Z plane at 2445 MHz. FIG. 8A is a schematic diagram of the 2D field pattern of the micro slotted antenna device according to an embodiment of the present invention in the X-Y plane at 5240 MHz. FIG. 8B is a schematic diagram of the 2D field pattern of the micro slotted antenna device according to an embodiment of the present invention in the X-Z plane at 5240 MHz. FIG. 8C is a schematic diagram of the 2D field pattern of the micro slotted antenna device according to an embodiment of the present invention in the Y-Z plane at 5240 MHz. FIG. 9A is a schematic diagram of the 2D field pattern of the micro slotted antenna device according to an embodiment of the present invention in the X-Y plane at 6400 MHz. FIG. 9B is a schematic diagram of the 2D field pattern of the micro slotted antenna device according to an embodiment of the present invention in the X-Z plane at 6400 MHz. FIG. 9C is a schematic diagram of the 2D field pattern of the micro slotted antenna device according to an embodiment of the present invention in the Y-Z plane at 6400 MHz.

10: Micro slotted antenna device

12: Dielectric substrate

121: First long side

122: Second long side

123: First short side

124: Second short side

125: First surface

14: Patterned metal layer

16: Slotting

18: T-type feed metal branch

181: Horizontal metal segment

182: Vertical metal segment

20: Coupling metal branch

22:Signal source

24: Grounding part

d: Spacing

Claims (13)

A micro slotted antenna device comprises: A dielectric substrate having a first long side and a second long side opposite to each other and a first short side and a second short side opposite to each other, and the dielectric substrate having a first surface and a second surface opposite to each other; A patterned metal layer located on the second surface of the dielectric substrate to form a slot on the second surface through the patterned metal layer; A T-shaped feeding metal branch located on the first surface of the dielectric substrate, and the vertical projection of the T-shaped feeding metal branch overlaps with the slot; A coupling metal branch is located on the first surface of the dielectric substrate, one end of the coupling metal branch is located on the first short side of one side of the T-type feeding metal branch, and the other end of the coupling metal branch is bent and extends along the first long side, so that there is a distance between the coupling metal branch and the T-type feeding metal branch; and a signal source is located on the first surface of the dielectric substrate and connected to the T-type feeding metal branch to transmit and receive a radio frequency signal. The micro slotted antenna device as described in claim 1 further includes a ground portion located on the first surface of the dielectric substrate and arranged along the second long side, so that the signal source is connected to the ground portion. A micro slotted antenna device as described in claim 2, wherein the T-shaped feeding metal branch comprises a horizontal metal segment and a vertical metal segment, the horizontal metal segment has the distance with the coupling metal branch, and one end of the vertical metal segment is connected to the horizontal metal segment, and the other end is connected to the signal source. The micro slotted antenna device as described in claim 1, wherein the patterned metal layer is disposed along the first long side, the first short side and the second long side to form the slot, and the opening of the slot is located at the second short side. A micro slotted antenna device as described in claim 1, wherein one end of the coupling metal branch is located at the first short side, and the other end is bent to extend toward the second short side, then bent to extend toward the first long side, and finally bent along the first long side, so that the coupling metal branch arranged along the first long side has the distance with the T-type feed metal branch. A micro slotted antenna device as described in claim 1, wherein one end of the coupling metal branch is parallel to the second long side, and the other end is bent to extend along the first short side, and then bent again to be arranged along the first long side, so that the coupling metal branch arranged along the first long side has the distance with the T-shaped feed metal branch. In the micro slotted antenna device as described in claim 2, the second long side of the dielectric substrate is adjacent to a metal frame of a display device, so that the ground portion is electrically connected to the metal frame. A micro slotted antenna device as described in claim 2, wherein the ground portion is electrically connected to the patterned metal layer. The micro slotted antenna device as described in claim 8, wherein the patterned metal layer is electrically connected to the ground portion through a metal strip or at least one metal through hole. A micro slotted antenna device as described in claim 1, wherein the T-shaped feed metal branch and the slot can excite a first operating mode with a center frequency of approximately 2.4 GHz. A micro slotted antenna device as described in claim 1, wherein the T-shaped feeding metal branch and the coupling metal branch can excite a second operating mode with a center frequency of approximately 5 GHz. A micro slotted antenna device as described in claim 1, wherein the T-type feeding metal branch can excite a third operating mode with a center frequency of approximately 6 GHz. In the micro slotted antenna device as described in claim 1, the signal source is connected to a system communication module of an electronic device via a coaxial transmission line, a planar transmission line, or a combination of the two.

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