TWI806527B - 28GHz MILLIMETER WAVE DUAL-POLARIZED ANTENNA AND ARRAY THEREOF - Google Patents

Abstract

A 28GHz millimeter wave dual-polarized antenna comprises a multi-layer substrate, a rectangular metal plate, an H-type slot, a first feeding line and a second feeding line. The multi-layer substrate has a first layer, a second layer, a third layer, a fourth layer and a fifth layer. The rectangular metal plate is a radiator at the fifth layer. The H-type slot, at the second layer, is over the rectangular metal plate. The H-type slot comprises a first straight-line section, a second straight-line section and a third straight-line section. The second straight-line section connects the middle part of the first straight-line section and the middle part of the third straight-line section for forming one H-shape. The first feeding line at the first layer orthogonally penetrates the projection of the middle part of the second straight-line section at the first layer. The first feeding line is longer than the first straight-line section and the third straight-line section. The first feeding line connects a first feeding network at the first layer. The second feeding line at the fourth layer orthogonally penetrates the projection of the middle part of the third straight-line at the fourth layer. And, the second feeding line does not across the projection of the first feeding line at the fourth layer. The second feeding line connects a second feeding network at the third layer by a via-hole. The distance between the second feeding line and the third straight-line section is larger than the distance between the first feeding line and the second straight-line section. Thus, a dual-polarized antenna adapted for an array can be achieved.

Description

28GHz millimeter wave dual polarized antenna and its array

The present invention relates to an antenna, and in particular to a 28GHz millimeter wave dual-polarized antenna and an array thereof.

With the rise of 5G communication technology, millimeter-wave antennas are a must-have technical solution in response to high data volumes and real-time transmission response requirements. In particular, millimeter-wave antenna arrays have the important characteristics of high gain and variable directivity. The traditional millimeter-wave antenna array actually needs to use complicated phase control and matching circuits, which greatly increases the circuit cost and the physical area of the antenna array product, and thus occupies a considerable part of the manufacturing cost. The traditional phase control and Matching circuit design also takes up an important part of the R&D cost, which makes it difficult to reduce the size of the traditional antenna array, and the R&D cost is also very high.

At home and abroad, millimeter-wave antenna arrays still generally use the same and standardized design, and the technologies and processes of related industries have not significantly reduced the overall cost ratio of the antenna array system in wireless modules. In essence, in the industrial development trend, there is a great need for a novel and cost-reduced millimeter-wave antenna array.

In order to solve the foregoing technical problems, an embodiment of the present invention provides a 28GHz millimeter-wave dual-polarized antenna including a multi-layer substrate, a rectangular metal plate, an H-shaped slot, A first feeder and a second feeder. The multi-layer substrate has five layers, which are the first layer, the second layer, the third layer, the fourth layer and the fifth layer in stacking order. The rectangular metal plate is located on the fifth floor, and the rectangular metal plate is the radiator. The H-shaped slot is located on the rectangular metal plate and is located on the second layer. The H-shaped slot includes a first straight section, a second straight section and a third straight section. The second straight section vertically connects the middle part of the first straight section and the third straight section. The middle part of the third straight section to form an H shape. The first feeder line is located on the first floor, and the middle part passing through the second straight section orthogonally is located at the projection position of the first floor. The length of the first feeder line is longer than that of the first straight section and the third straight section, and the connection of the first feeder line is located on the first floor. The first feed into the network. The second feeder is located on the fourth floor, passing through the projection position of the third straight section on the fourth floor at right angles, and the second feeder does not cross the projection position of the first feeder on the fourth floor, and the second feeder is connected with a through hole on the fourth floor The second feeding network of three layers, wherein the distance between the second feeding line and the third straight section is greater than the distance between the first feeding line and the second straight section.

An embodiment of the present invention also provides a 28GHz millimeter-wave dual-polarization antenna array, including four 28GHz millimeter-wave dual-polarization antennas as described above, and the 28GHz millimeter-wave dual-polarization antennas are arranged in a 2*2 array.

To sum up, the embodiment of the present invention provides a 28GHz millimeter wave dual-polarized antenna and its array. The antenna body does not need to use a complete ground plane like a patch antenna (patch antenna), and it can be used after using a double feeder. To achieve dual polarization, the laminated structure of rectangular metal plates and feeders is especially suitable for antenna arrays. It is used for high gain and can solve the problem of excessive volume of traditional antenna arrays. It has high industrial application value.

In order to enable a further understanding of the features and technical content of the present invention, please refer to the following detailed description and accompanying drawings of the present invention, but these descriptions and accompanying drawings are only used to illustrate the present invention, not to claim the rights of the present invention any limitations on the scope.

1: Multilayer substrate

2: Rectangular metal plate

3: H-shaped slot

4: The first feeder

5: Second feeder

L1: first floor

L2: second floor

L3: the third layer

L4: fourth floor

L5: fifth floor

LL: sixth floor

4A: The first feed into the network

5A: The second feeding network

30: metal plane

31: The first straight section

32: The second straight section

33: The third straight section

P: through hole

21: First side

22: Second side

311: the first end of the first straight section

331: the first end of the third straight section

FIG. 1 is a schematic diagram of the structure of a 28GHz millimeter wave dual-polarized antenna and its array on the first layer of a multilayer substrate provided by an embodiment of the present invention.

Fig. 2 is a schematic diagram of the structure of the 28GHz millimeter wave dual-polarized antenna and its array on the second layer of the multilayer substrate provided by the embodiment of the present invention.

Fig. 3 is a schematic diagram of the structure of the 28GHz millimeter wave dual-polarized antenna and its array on the third layer of the multilayer substrate provided by the embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a 28GHz millimeter-wave dual-polarized antenna and its array on the sixth layer of a multilayer substrate provided by an embodiment of the present invention.

Fig. 5 is a schematic diagram of the structure of the 28GHz millimeter wave dual-polarized antenna and its array on the fourth layer of the multilayer substrate provided by the embodiment of the present invention.

Fig. 6 is a schematic diagram of the structure of the 28GHz millimeter wave dual-polarized antenna and its array on the fifth layer of the multilayer substrate provided by the embodiment of the present invention.

Fig. 7 is a perspective view of a 28GHz millimeter wave dual-polarized antenna provided by an embodiment of the present invention

Please refer to FIG. 1 to FIG. 7 , the embodiment of the present invention provides a 28GHz millimeter wave dual-polarized antenna including a multi-layer substrate 1 , a rectangular metal plate 2 , an H-shaped slot 3 , a first feeder 4 and a second feeder 5 . The multilayer substrate 1 has five layers, which are the first layer L1 , the second layer L2 , the third layer L3 , the fourth layer L4 and the fifth layer L5 in stacking order. 1 to 3 respectively show the structures in the first layer L1 , the second layer L2 and the third layer L3 . Figures 5 and 6 are the fourth Structure of layer L4 and fifth layer L5. Figure 4 shows the structure of the sixth layer LL. The sixth layer LL is not necessary and is only used to facilitate adjustment of impedance matching and production. The rectangular metal plate 2 is on the fifth layer L5 and is a radiator. The H-shaped slot 3 is on the second layer L2 and is used to couple energy to the radiator. The first layer L1 has a first feeder line 4 and a first feeder network 4A connected thereto, responsible for feeding the signal of the first polarization direction into the H-shaped slot 3 . The second feeder 5 and the connected second feeder network 5A are responsible for feeding the signal in the second polarization direction into the H-shaped slot. The second feeder 5 is on the fourth layer L4, and the second feeder network 5A In the third layer L3, another part of the second feeding network 5A is in the first layer L1 (for the convenience of manufacturing and assembling the circuit system). The characteristic of the above-mentioned stacked structure is that it is suitable for making the 28 GHz millimeter-wave dual-polarized antenna into the dual-polarized antenna array of the embodiment of the present invention. The three-dimensional perspective view of the 28GHz millimeter-wave dual-polarization antenna is shown in Figure 7. The detailed structure will be as follows:

Referring to FIG. 6 , the rectangular metal plate 2 is located on the fifth layer L5. The rectangular metal plate 2 is a radiator, preferably a nearly square metal plate, such as a metal radiator with a length and a width of 2.2 millimeters (mm). The radiation generated by the radiator is radiated toward the outside of the multilayer substrate 1 , if the first layer L1 is directed upwards and the fifth layer L5 is directed downwards, the generated radiation is mainly directed downwards.

Referring to FIG. 2 , an H-shaped slot 3 is made on a metal plane 30 , that is, an H-shaped opening (grooving). The metal plane 30 in the figure is a rectangle, which is only used for example. The metal plane 30 is the metal circuit layer between the first layer L1 and the second layer L2. The H-shaped slot 3 is described in detail as follows. The H-shaped slot 3 is located on the rectangular metal plate 2 and on the second layer L2. The H-shaped slot 3 includes a first straight section 31, a second straight section 32 and a third straight section. 33. The above-mentioned three straight sections are the abbreviations of the straight section, that is, the section of the straight line (strip type), and the straight section is referred to as the abbreviation below. The second straight section 32 vertically connects the middle part of the first straight section 31 and the middle part of the third straight section 33 to form an H shape. Preferably, the second straight of the H-shaped slot The width of section 32 is wider than the width of the first straight section 31, the width of the second straight section 32 is wider than the width of the third straight section 33, the first straight section 31 of the H-shaped slot hole and the third straight section 33 The widths are the same. The width of the second straight segment 32 is, for example, 0.3 millimeters (mm), and the widths of the first straight segment 31 and the third straight segment 33 are, for example, 0.1 mm. In addition, preferably, the length of the first straight section 31 of the H-shaped slot hole is preferably about 1.4 millimeters (mm), so that the middle part of the first straight section 31 (where the second straight section 32 is connected) goes to both sides The length is about 0.5 mm to 0.6 mm. In the same way, the length of the third straight section 33 of the H-shaped slot hole is preferably about 1.4 millimeters (mm), so that the length of the middle part of the third straight section 33 (where the second straight section 32 is connected) to both sides is about 1.4 millimeters (mm). 0.5 mm to 0.6 mm.

Referring to Fig. 1 and Fig. 7, the first feeder 4 is located on the first layer L1, and the middle part passing through the second straight section 32 orthogonally is located at the projection position of the first layer L1. Orthographic projection, no need to repeat it. The length of the first feeder 4 is longer than the first straight section 31 and the third straight section 33 , that is, the feeding length of the first feeder 4 is longer than the long side of the H shape. The first feeder 4 is connected to the first feeder network 4A located on the first layer L1, as shown in FIG. 1 .

Referring to Fig. 3, Fig. 5 and Fig. 7, the second feeder 5 is located on the fourth layer L4, and passes through the projection position of the third straight section 33 on the fourth layer L4 orthogonally, and the second feeder 5 does not cross the first feeder 4 on the In the projection position of the fourth layer L4, the second feeder line 5 is connected to the second feeder network 5A on the third layer L3 through through holes. In addition, the second feeding network 5A of the first layer L1 in FIG. 1 is an extension of the second feeding network 5A of the third layer L3, and is used to facilitate soldering feeding during circuit system assembly. Furthermore, when the sixth layer LL is used, the through-hole P of the sixth layer LL promptly shows the through-hole passing place where the second feeder 5 is connected with the second feed-in network 5A, and the purpose of the sixth layer LL will be in the follow-up description. The distance between the second feeder 5 and the third straight section 33 is greater than the distance between the first feeder 4 and the second straight section 32 . From the above, it can be seen that the first layer The first feeding network 4A of L1 and the second feeding network 5A located on the third layer L3 are respectively located on different sides of the metal plane 30 where the H-shaped slot 3 is located, which can be used to reduce the size of the feeding network. Winding space.

The above-mentioned first feeder line 4 is a feeder line of the first polarization, and the second feeder line 5 is a feeder line of the second polarization, and the first polarization and the second polarization are orthogonal to each other. The rectangular metal plate 2 has a first side 21 and a second side 22 adjacent to each other, the first side 21 is parallel to the direction of the first polarization, and the second side 22 is parallel to the direction of the second polarization. The first feeder 4 is linear, and the direction of the first polarization is parallel to the first feeder 4 . The second feeder 5 is linear, and the direction of the second polarization is parallel to the second feeder 5 . Referring to Fig. 7, as the impedance matching of the dual-polarized signal fed in, the first end 311 of the first straight section 31 of the H-shaped slot 3 is aligned with the second side 22 of the rectangular metal plate 2, and the third straight section 31 is aligned with the second side 22 of the rectangular metal plate 2. The first end 331 of the segment 33 is aligned with the second side 22 of the rectangular metal plate 2 .

The first layer L1, the second layer L2, the third layer L3, the fourth layer L4 and the fifth layer L5 have the same thickness. The multi-layer substrate 1 may further include a sixth layer LL, the sixth layer LL is located between the third layer L3 and the fourth layer L4, and the sixth layer LL is used to increase the distance between the second feeder line 5 and the third straight section 33 . The thickness of the sixth layer LL is, for example, the same as that of the above five layers, so as to simplify the manufacturing and reduce the cost by utilizing the six-layer board manufacturing process of the circuit board. The substrate is, for example, RO4003, which is a kind of substrate commonly used in high-frequency microwaves. The thickness of each layer is, for example, 8 mils (mil), which is about 0.2 millimeters (mm).

Preferably, the width of the second feeder 5 is wider than that of the first feeder 4 , the width of the second feeder 5 is, for example, 0.2 millimeters (mm), and the width of the first feeder 4 is, for example, 0.1 millimeters (mm). Because it is a dual-polarized feed-in configuration, the different-width feed-line configuration is used to adjust the impedance matching of the feed-in to the radiator (rectangular metal plate).

According to the above, the embodiment of the present invention also provides a 28GHz millimeter wave dual The polarized antenna array includes four 28GHz millimeter-wave dual-polarized antennas as mentioned above, the first feeding network 4A has four branches, and the second feeding network 5A has four branches. The 28GHz millimeter-wave dual-polarized antennas are arranged in a 2*2 array, and the lateral and vertical distances between the rectangular metal plates serving as radiators are both 4.2 millimeters (mm), making it a square array.

To sum up, the 28GHz millimeter-wave dual-polarized antenna and its array provided by the embodiment of the present invention do not need to use a complete ground plane (including feeder, feeder, etc.) network and H-shaped slots are not a complete ground plane), and double polarization can be achieved after using double feeders. The laminated structure of rectangular metal plates and feeders is especially suitable for antenna arrays. It is used for high-gain , has high industrial application value.

The above descriptions are only examples of the present invention, and are not intended to limit the patent scope of the present invention.

2: Rectangular metal plate

3: H-shaped slot

4: The first feeder

5: Second feeder

4A: The first feed into the network

5A: The second feeding network

31: The first straight section

32: The second straight section

33: The third straight section

P: through hole

21: First side

22: Second side

311: the first end of the first straight section

331: the first end of the third straight section

Claims (10)

A 28GHz millimeter-wave dual-polarized antenna includes: a multilayer substrate with five layers, which are a first layer, a second layer, a third layer, a fourth layer, and a fifth layer in a stacking order; a rectangular A metal plate is located on the fifth layer, and the rectangular metal plate is a radiator; an H-shaped slot is located on the second layer, and the H-shaped slot is made on a metal plane, and the H-shaped slot is located on the rectangular Above the metal plate, the H-shaped slot hole includes a first straight section, a second straight section and a third straight section, the second straight section vertically connects the middle part of the first straight section and the third straight section The middle part of the first feeder line is located in the first layer and is located at the projected position of the first layer through the middle part of the second straight section. The length of the first feeder line is longer than that of the first straight line section and the third straight section, the first feeder is connected to a first feeding network located on the first floor; and a second feeder, located on the fourth floor, passes through the third straight section at right angles to the first The projected position on the fourth floor, and the second feeder does not cross the first feeder at the projected position on the fourth floor, the second feeder is connected to a second feeder network on the third floor with a through hole, wherein The distance between the second feeder line and the third straight section is greater than the distance between the first feeder line and the second straight section. According to the 28GHz millimeter-wave dual-polarized antenna described in Item 1 of the claim, the first feeder is a feeder of a first polarization, the second feeder is a feeder of a second polarization, and the first polarization and The second polarizations are orthogonal to each other, wherein the rectangular metal plate has a first side and a second side adjacent to each other, the first side is parallel to the direction of the first polarization, and the second side The sides are parallel to the direction of the second polarization. According to the 28GHz millimeter wave dual-polarized antenna described in item 2 of the request, the item A feeder is linear, the direction of the first polarization is parallel to the first feeder, the second feeder is linear, and the direction of the second polarization is parallel to the second feeder. According to the 28GHz millimeter wave dual-polarized antenna described in item 1 of the claim, the first layer, the second layer, the third layer, the fourth layer and the fifth layer have the same thickness. According to the 28GHz millimeter wave dual-polarized antenna described in item 4 of the claim, wherein the multilayer substrate further includes a sixth layer, the sixth layer is located between the third layer and the fourth layer, and the sixth layer is used for To increase the distance between the second feeder and the third straight section. According to the 28GHz millimeter wave dual-polarized antenna described in item 1 of the claim, the width of the second feeder is wider than that of the first feeder. According to the 28GHz millimeter wave dual-polarized antenna described in item 1 of the claim, wherein the width of the second straight section of the H-shaped slot is wider than the width of the first straight section, and the width of the second straight section is wider than that of the first straight section The width of the third straight segment is wider. According to the 28GHz millimeter wave dual-polarized antenna described in item 1 of the claim, the width of the first straight section of the H-shaped slot is the same as that of the third straight section. According to the 28GHz millimeter wave dual-polarized antenna described in Item 1 of the claim, wherein a first end of the first straight section of the H-shaped slot is aligned with the second side of the rectangular metal plate, the first end A first end of the three straight sections is aligned with the second side of the rectangular metal plate. A 28GHz millimeter-wave dual-polarization antenna array, comprising four 28GHz millimeter-wave dual-polarization antennas as described in item 1 of the claim, and the 28GHz millimeter-wave dual-polarization antennas are arranged in a 2*2 array.

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