TWI862081B - Antenna module - Google Patents

Abstract

An antenna module includes at least one antenna structure. The at least one antenna structure includes a feeding portion, transmission lines, antenna radiators, a ground plane and ground radiators. The transmission lines are radially connected to the feeding portion. The antenna radiators are connected to the transmission lines and away from the feeding portion. The feeding portion, the transmission lines, and the antenna radiators are located on a first plane. The ground plane is located on a second plane. A projection of the feeding portion projected to the second plane is at least partially overlaps the ground plane. The ground radiators are located on the second plane and radially connected to the ground plane. Projections of the antenna radiators projected to the second plane are at least partially overlaps the ground radiators.

Description

Antenna Module

The present invention relates to an antenna module, and in particular to an antenna module capable of generating two frequency bands.

With the development of technology, users' requirements for communication transmission performance have been improved. In order to further increase the frequency band range that network communication products can cover, the number of antennas will increase accordingly. As far as current network communication products are concerned, increasing the number of antennas will easily affect the antenna pattern and efficiency. How to make the designed antenna have good performance is one of the goals that researchers in this field are working hard to study.

The present invention provides an antenna module having good antenna performance.

An antenna module of the present invention includes at least one antenna structure. The at least one antenna structure includes a feed part, a plurality of transmission lines, a plurality of antenna radiators, a ground plane and a plurality of ground radiators. The transmission lines are radially connected to the feed part. The antenna radiators are connected to the transmission lines and are far away from the feed part. The feed part, the transmission lines and the antenna radiators are located in a first plane. The ground plane is located in a second plane. The projection of the feed part on the second plane at least partially overlaps the ground plane. The ground radiators are located in the second plane and radially connected to the ground plane. The projection of the antenna radiators on the second plane at least partially overlaps the ground radiators. The feeding part is used to be fed with a signal, which is coupled with the grounding radiators after passing through these transmission lines and these antenna radiators, and then grounded by the grounding surface to generate a first frequency band. The signal passes through these transmission lines and these antenna radiators to generate a second frequency band.

In an embodiment of the present invention, each of the above-mentioned ground radiators includes a first ground radiator and a second ground radiator, the second ground radiator connects the first ground radiator and the ground plane, and the projections of these antenna radiators on the second plane overlap the first ground radiator and are staggered with the second ground radiator.

In one embodiment of the present invention, the first ground radiator is perpendicular to the corresponding second ground radiator, and the width of the first ground radiator is greater than the width of the second ground radiator.

In one embodiment of the present invention, among any two of the adjacent ground radiators mentioned above, the first ground radiator of one of the ground radiators is perpendicular to the first ground radiator of the other ground radiator, and the second ground radiator of one of the ground radiators is perpendicular to the second ground radiator of the other ground radiator.

In one embodiment of the present invention, each of the above-mentioned transmission lines is connected to the corresponding antenna radiator in an arc or straight line, and the angle between each transmission line and the corresponding antenna radiator is less than 90 degrees.

In one embodiment of the present invention, the length of each of the above-mentioned first ground radiators and the corresponding second ground radiators is 0.25 times the wavelength of the first frequency band.

In one embodiment of the present invention, the length of each of the above-mentioned antenna radiators is 0.25 times the wavelength of the second frequency band.

In one embodiment of the present invention, the at least one antenna structure mentioned above includes two antenna structures, and the distance between the two antenna structures is greater than 20 mm.

In one embodiment of the present invention, each ground radiator of each of the two antenna structures includes a first ground radiator and a second ground radiator, the second ground radiator is vertically connected to the first ground radiator and the ground plane, and the first ground radiator of one of the two antenna structures is adjacent to and perpendicular to the first ground radiator of the other of the two antenna structures.

In one embodiment of the present invention, the first frequency band is between 5150MHz-6590MHz, and the second frequency band is between 6590MHz-7125MHz.

Based on the above, the antenna module of the present invention includes at least one antenna structure. The feed part, multiple transmission lines and multiple antenna radiators of at least one antenna structure are located in a first plane. The ground plane of at least one antenna structure and these ground radiators are located in a second plane. The projections of these antenna radiators on the second plane at least partially overlap with these ground radiators. The feed part is used to be fed with signals, and the signals are coupled with these ground radiators after passing through these transmission lines and these antenna radiators, and then grounded by the ground plane to generate a first frequency band. The signals pass through these transmission lines and these antenna radiators to generate a second frequency band. Through such a design, the antenna module of the present invention generates a dual-frequency signal with good performance through the partially overlapping antenna radiator and the ground radiator.

10: Antenna module

100, 100a, 100b: Antenna structure

110: Feeding Department

120: Transmission line

130: Antenna Radiator

140: Ground contact surface

150, 150a, 150b: Ground radiator

151: The first ground radiator

152: Second Earth Radiator

160: Circuit board

D: Spacing

P1~P6: Location

S1: First plane

S2: Second plane

FIG1A is a perspective schematic diagram of an antenna module according to an embodiment of the present invention.

FIG1B is an exploded schematic diagram of the antenna module of FIG1A .

Figure 1C is a schematic diagram of the transmission line, antenna radiator and circuit board of Figure 1A.

FIG1D is a schematic diagram of the appearance of the ground plane and the ground radiator of FIG1A.

Figure 2 is the radiation pattern of the antenna module in Figure 1 on the X-Y plane.

Figure 3 is a graph showing the relationship between the frequency and S11 of the antenna module in Figure 1.

Figure 4 is a schematic diagram of the two antenna structures of the antenna module of Figure 1.

Figure 5 is a graph showing the relationship between the frequency and antenna isolation between the two antenna structures in Figure 4 and the two known antennas.

The antenna module 10 of the present invention is a double-sided antenna that can meet the bandwidth requirements of Wi-Fi 6E (5150MHz-7125MHz) and also has good antenna isolation, antenna pattern and efficiency. The structure of the antenna module 10 of the present invention is introduced below.

FIG. 1A is a perspective schematic diagram of an antenna module according to an embodiment of the present invention. FIG. 1B is an exploded schematic diagram of the antenna module of FIG. 1A. FIG. 1C is an external schematic diagram of the transmission line, antenna radiator and circuit board of FIG. 1A. FIG. 1D is an external schematic diagram of the ground plane and ground radiator of FIG. 1A.

It should be noted that in order to clearly see the relative positions of the various components of this embodiment, the ground plane 140, the first ground radiator 151 and the second ground radiator 152 in FIG. 1A are all drawn in a perspective manner.

Please refer to Figures 1A to 1D. The antenna module 10 of this embodiment includes at least one antenna structure 100. At least one antenna structure 100 includes a feeding part 110, multiple transmission lines 120, multiple antenna radiators 130, a circuit board 160, a ground plane 140 and multiple ground radiators 150. The feeding part 110, these transmission lines 120 and these antenna radiators 130 are located in a first plane S1. The ground plane 140 and these ground radiators 150 are located in a second plane S2. In other words, the feeding part 110, these transmission lines 120, these antenna radiators 130 and the ground plane 140, these ground radiators 150 are located in different planes.

In addition, the first plane S1 and the second plane S2 are different planes, and the first plane S1 and the second plane S2 can be the upper and lower surfaces of the circuit board 160. The circuit board 160, the transmission lines 120, the antenna radiators 130, the ground plane 140, and the ground radiators 150 are implemented by, for example, a circuit board with copper foil on both sides.

The projection of the feeding part 110 of this embodiment on the second plane S2 at least partially overlaps the ground plane 140. These transmission lines 120 are radially connected to the feeding part 110. In Figures 1A to 1C, each transmission line 120 is a straight line and connects the corresponding feeding part 110, but in other embodiments, the transmission line 120 can also be an arc. The present invention is not limited to this.

These antenna radiators 130 are connected to these transmission lines 120 and are far away from the feeding part 110, and the angle between each transmission line 120 and the corresponding antenna radiator 130 is less than 90 degrees. The appearance of the antenna radiator 130 is, for example, rectangular, and two adjacent antenna radiators 130 are perpendicular to each other. However, the present invention does not limit the appearance of the antenna radiator 130.

These ground radiators 150 of this embodiment are radially connected to the ground plane 140. Specifically, please refer to Figure 1A and Figure 1D, each ground radiator 150 includes a first ground radiator 151 and a second ground radiator 152. Each second ground radiator 152 vertically connects the corresponding first ground radiator 151 and the ground plane 140, and the width of the first ground radiator 151 is greater than the width of the second ground radiator 152. However, the present invention is not limited to this.

Each first ground radiator 151 is perpendicular to the corresponding second ground radiator 152, so that the ground radiator 150 has an L-shaped appearance. As shown in FIG. 1A and FIG. 1D, in any two adjacent ground radiators 150, the first ground radiator 151 of one ground radiator 150 is perpendicular to the first ground radiator 151 of the other ground radiator 150, and the second ground radiator 152 of one ground radiator 150 is perpendicular to the second ground radiator 152 of the other ground radiator 150.

In addition, the projections of these antenna radiators 130 on the second plane S2 at least partially overlap with these ground radiators 150. Specifically, the projections of these antenna radiators 130 on the second plane S2 overlap with the first ground radiator 151 and are offset from the second ground radiator 152. That is, the antenna radiator 130 and the first ground radiator 151 overlap.

The feeding part 110 is used to be fed with a signal. The signal passes through the transmission lines 120 and the antenna radiators 130, couples with the ground radiators 150, and is grounded to the ground plane 140 to generate a first frequency band. On the other hand, the signal passes through the transmission lines 120 and the antenna radiators 130 to generate a second frequency band. The first frequency band is between 5150MHz-6590MHz, and the second frequency band is between 6590MHz-7125MHz.

In detail, after the signal is fed from the feeding part 110, the signal passes through the transmission lines 120 to the antenna radiators 130. Since the projection of the antenna radiator 130 on the second plane S2 overlaps the first ground radiator 151, the signal can be coupled with the first ground radiator 151 through the antenna radiators 130, and then transmitted to the second ground radiator 152 and the ground plane 140 to generate a first frequency band.

That is, the signal is fed from the feed end 110 and sequentially passes through the transmission line 120, the antenna radiator 130, the first ground radiator 151, the second ground radiator 152 (sequentially passing through position P1 to position P6 in FIG. 1C and FIG. 1D ) and then to the ground plane 140 to generate the first frequency band. The length of each first ground radiator 151 and the corresponding second ground radiator 152 (position P4 to position P6 in FIG. 1D ) is 0.25 times the wavelength of the first frequency band.

In addition, after the signal is fed from the feeder 110, it passes through the transmission lines 120 and the antenna radiators 130 (i.e., passing through position P1 to position P3 in FIG1C ), thereby generating a second frequency band. The length of each antenna radiator 130 (position P2 to position P3 in FIG1C ) is 0.25 times the wavelength of the second frequency band.

That is to say, through the design of the antenna radiator 130 overlapping with the first ground radiator 151, the antenna module 10 of the present invention can generate the first frequency band and the second frequency band, thereby meeting the bandwidth requirements of Wi-Fi 6E (5150MHz-7125MHz). Therefore, the antenna module 10 of the present invention can generate dual-band signals and has a better bandwidth.

As mentioned above, conventional antennas have insufficient bandwidth and cannot meet the bandwidth requirements of Wi-Fi 6E (5150MHz-7125MHz). The antenna module 10 of the present invention uses a double-sided antenna design to generate a frequency band that meets the bandwidth of Wi-Fi 6E by overlapping the antenna radiator 130 with the first ground radiator 151.

It should be added that the number of the transmission line 120, antenna radiator 130 and ground radiator 150 of the present invention is four, but the present invention is not limited to this, as long as the number of the transmission line 120, antenna radiator 130 and ground radiator 150 is the same.

FIG2 is a radiation pattern diagram of the antenna module of FIG1 in the X-Y plane. Referring to FIG2, the antenna module 10 has a good omnidirectional radiation pattern when the signal frequency is 5.47 GHz (within the first frequency band) and 6.525 GHz (within the second frequency band). In other words, the antenna module 10 of this embodiment generates a good omnidirectional radiation pattern in the first frequency band and the second frequency band.

FIG3 is a relationship diagram between the frequency and S11 of the antenna module of FIG1. Referring to FIG3, the frequency bands from 1 to 3 are, for example, the first frequency band (5.15 GHz-6.59 GHz) of this embodiment, and the frequency bands from 3 to 2 are, for example, the second frequency band (6.59 GHz-7.125 GHz) of this embodiment. When the antenna module 10 of this embodiment generates the first frequency band (from 1 to 3) and the second frequency band (from 3 to 2), S11 is less than -7.5 dB. That is, the first frequency band and the second frequency band generated by the antenna module 10 of this embodiment both have good performance.

FIG4 is a schematic diagram of two antenna structures of the antenna module of FIG1. Referring to FIG4, at least one antenna structure 100 of the antenna module 10 includes two antenna structures 100a and 100b, and the distance D between the two antenna structures 100a and 100b is greater than 20 mm.

In addition, the first ground radiator of one of the two antenna structures 100a and 100b is adjacent to and perpendicular to the first ground radiator of the other of the two antenna structures 100a and 100b, for example, the first ground radiator 151a is adjacent to and perpendicular to the first ground radiator 151b. Through such a configuration, the current direction of one of the first ground radiators 151a of the two antenna structures 100a is toward the right of FIG. 4, and the current direction of one of the first ground radiators 151b of the two antenna structures 100b is toward the top of FIG. 4 (as shown by the thick arrow in the center of FIG. 4). That is, the current direction of the first ground radiator 151a is perpendicular to the current direction of the first ground radiator 151b, and the isolation between the two antenna structures 100a and 100b can be improved.

FIG5 is a graph showing the relationship between the frequency and antenna isolation between the two antenna structures of FIG4 and the two antennas in the prior art. Referring to FIG5, when the two antennas are set 20 mm apart from each other, the isolation performance of the two antennas in Wi-Fi 6E (5150 MHz-7125 MHz) is less than -14 dB. When the two antenna structures 100a and 100b of the present invention are set 20 mm apart from each other, the isolation performance of the two antenna structures 100a and 100b in Wi-Fi 6E (5150 MHz-7125 MHz) can be less than -23 dB. In other words, the frequency bands generated by the two antenna structures 100a and 100b of the present invention not only have good antenna efficiency and field pattern, but also meet the antenna bandwidth of Wi-Fi 6E, and also have better isolation performance.

In summary, the feed part, the transmission lines and the antenna radiators of the antenna module of the present invention are located in a first plane. The ground plane and the ground radiators are located in a second plane. The projections of the antenna radiators on the second plane at least partially overlap the ground radiators. The feed part is used to be fed with signals. The signals pass through the transmission lines and the antenna radiators, couple with the ground radiators, and are then grounded to the ground plane to generate a first frequency band. The signals are fed from the feed part, and pass through the transmission lines and the antenna radiators to generate a second frequency band. Through such a design, the antenna module of the present invention can generate a signal that meets the Wi-Fi 6E bandwidth through the overlapping antenna radiator and the first ground radiator. The first frequency band and the second frequency band generated by the antenna module of the present invention have good antenna pattern and efficiency.

In addition, the antenna module of the present invention includes two antenna structures, and the distance between the two antenna structures is greater than 20 mm. The first ground radiator of one of the two antenna structures is adjacent to and perpendicular to the first ground radiator of the other of the two antenna structures. Such a setting can improve the isolation between the two antenna structures.

10: Antenna module

100: Antenna structure

110: Feeding Department

120: Transmission line

130: Antenna Radiator

140: Ground contact surface

150: Ground Radiator

152: Second Earth Radiator

160: Circuit board

S1: First plane

S2: Second plane

Claims (10)

An antenna module includes at least one antenna structure, wherein the at least one antenna structure includes: a feed portion; a plurality of transmission lines radially connected to the feed portion; a plurality of antenna radiators connected to the transmission lines and away from the feed portion, wherein the feed portion, the transmission lines and the antenna radiators are located in a first plane; a ground plane located in a second plane, wherein the projection of the feed portion on the second plane at least partially overlaps the ground plane; and a plurality of ground radiators located in the second plane and radially connected to the ground plane, wherein the projections of the antenna radiators on the second plane at least partially overlap the ground radiators, The feeding part is used to be fed with a signal, and the signal passes through the transmission lines and the antenna radiators, couples with the ground radiators, and is then grounded by the ground plane to generate a first frequency band, and the signal passes through the transmission lines and the antenna radiators to generate a second frequency band. An antenna module as described in claim 1, wherein each of the ground radiators includes a first ground radiator and a second ground radiator, the second ground radiator connects the first ground radiator and the ground plane, and the projections of the antenna radiators on the second plane overlap with the first ground radiator and are staggered with the second ground radiator. An antenna module as described in claim 2, wherein the first ground radiator is perpendicular to the corresponding second ground radiator, and the width of the first ground radiator is greater than the width of the second ground radiator. An antenna module as described in claim 2, wherein, among any two adjacent ground radiators, the first ground radiator of one of the ground radiators is perpendicular to the first ground radiator of the other ground radiator, and the second ground radiator of one of the ground radiators is perpendicular to the second ground radiator of the other ground radiator. The antenna module as described in claim 1, wherein each transmission line is connected to the corresponding antenna radiator in an arc or a straight line, and the angle between each transmission line and the corresponding antenna radiator is less than 90 degrees. The antenna module as described in claim 1, wherein the length of each first ground radiator and the corresponding second ground radiator is 0.25 times the wavelength of the first frequency band. An antenna module as described in claim 1, wherein the length of each antenna radiator is 0.25 times the wavelength of the second frequency band. The antenna module as described in claim 1, wherein the at least one antenna structure includes two antenna structures, and the distance between the two antenna structures is greater than 20 mm. An antenna module as described in claim 8, wherein each of the ground radiators of each of the two antenna structures includes a first ground radiator and a second ground radiator, the second ground radiator is vertically connected to the first ground radiator and the ground plane, and the first ground radiator of one of the two antenna structures is adjacent to and perpendicular to the first ground radiator of the other of the two antenna structures. An antenna module as described in claim 1, wherein the first frequency band is between 5150MHz-6590MHz, and the second frequency band is between 6590MHz-7125MHz.

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