Dual-polarization millimeter wave antenna

Abstract

The present invention discloses a dual-polarization millimeter wave antenna, comprising a multi-layer substrate, a first disk, a second disk, a first arc, a second arc, a third disk, a ground plane, a first feed line and a second feed line. The first disk is on the first layer, and the first feed end and the second feed end are at the same distance from the first center of the circle, and the angle between the first feed end and the second feed end is equal to 90 degrees. The second disk is on the second layer and is located directly below the first disk, and is smaller than the first disk. The first arc is located outside the second disk on the second layer. The second arc is the same as the first arc. The second ends of the first and second arcs are close to each other. The third disk is on the third layer, located directly below the second disk, and is larger than the first disk. A conductor column connects the centers of the three disks. The ground plane is on the fourth layer. The first and second feed lines respectively use through holes to cross the ground plane and the third disk, and connect the first ends of the first and second arcs to connect the first and second feed ends. The present invention can improve the isolation between the above-mentioned dual feeds.

Description

Technical Field

[0001] The present invention relates to an antenna, in particular to a dual-polarization operated millimeter wave antenna. Background Art

[0002] The current fifth generation mobile communication (5G) is mainly divided into two frequency segments. The first is the application below 6GHz, which is often called Sub5G, providing new application frequency bands and new algorithm coding methods. The second is the millimeter wave frequency band, which provides huge data traffic and higher information response capabilities. The millimeter wave has a higher operating frequency, higher dielectric loss, and higher manufacturing precision requirements for antenna modules, but compared to Sub 5G, it is a more important communication medium in the future 5G communication era.

[0003] With the continuous development of the 5G communication era and antenna technology, the requirements for antenna size of future smart terminal products will inevitably become more and more stringent, and the competition among manufacturers will become more intense. The difference in antenna size will be a very critical factor. For customers, a smaller antenna design will allow product design to have greater application flexibility and space to enhance product competitiveness. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the task of the present invention is to provide a millimeter wave antenna operating in dual polarization, so as to reduce the antenna mention and improve the isolation between feeds.

[0005] The technical solution of the present invention is as follows: A millimeter wave antenna for dual-polarization operation, comprising:

[0006] include:

[0007] A multi-layer substrate having a first layer, a second layer, a third layer and a fourth layer;

[0008] A first circular disk, on the first layer, having a first feeding end and a second feeding end, wherein the distance between the first feeding end and the first center of the first circular disk is the same as the distance between the second feeding end and the first center of the first circle, and the angle between the first feeding end and the second feeding end is equal to 90 degrees;

[0009] a second disk, located on the second layer and directly below the first disk, smaller than the first disk;

[0010] A first arc, in the second layer, with the second center of the second disk as the center and a radius greater than the radius of the second disk, disposed outside the second disk, having a first end and a second end;

[0011] a second arc, in the second layer, having the same center, radius and length as the first arc, and having a first end and a second end, wherein the second end of the first arc and the second end of the second arc are close to each other;

[0012] A third disk, located on the third layer, directly below the second disk, and larger than the first disk, wherein a conductor column connects the first center, the second center, and the third center of the third disk;

[0013] A ground plane, on the fourth layer;

[0014] A first feed line, passing through the ground plane and the third disk through a through hole, and connecting the first end of the first arc to connect to the first feeding end; and

[0015] The second feed line passes through the ground plane and the third disk through a through hole and is connected to the first end of the second arc to connect to the second feeding end.

[0016] Furthermore, it includes a first conductor frame, a second conductor frame and a third conductor frame of the same size, the first conductor frame is arranged on the first layer and surrounds the first disk, the second conductor frame is arranged on the second layer and surrounds the second disk, the first arc and the second arc, and the third conductor frame is arranged on the third disk.

[0017] Furthermore, the dual-polarization millimeter wave antenna operates at 28 GHz.

[0018] Furthermore, the second disk, the conductor column, the first arc and the second arc are used to improve the isolation between the first feeding end and the second feeding end.

[0019] Furthermore, the radius of the first disk is 61.5 mils, the radius of the second disk is 47.5 mils, and the radius of the third disk is 101.5 mils. The first feeding end and the second feeding end are 7.8 mils away from the circumference of the first disk. The diameter of the through hole used by the first feed line and the second feed line is 12 mils.

[0020] Furthermore, the substrate between the first layer and the second layer is RO-4350B, and the distance between the first layer and the second layer is 19.7 mils; the substrate between the second layer and the third layer is RO-4450F, and the distance between the second layer and the third layer is 7.9 mils; the substrate between the third layer and the fourth layer is RO-4350B, and the distance between the third layer and the fourth layer is 19.7 mils.

[0021] Furthermore, the first layer, the second layer, the third layer and the fourth layer are all copper and have a thickness of 1.4 mils.

[0022] Furthermore, the third disk is a parasitic antenna.

[0023] Furthermore, the first circular arc and the second circular arc together form a 3 / 4 circular arc with a break in the middle.

[0024] Furthermore, a radius of the second circular disk is smaller than a distance between the first feeding end and the first center of the circle.

[0025] The advantages of the present invention compared with the prior art are:

[0026] The present invention utilizes the coupled third disk, the conductive second disk and the stacked structure of two arcs to not only reduce the antenna area, but also improve the isolation between the dual feeds, and has high industrial application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the stacked structure of a dual-polarization operating millimeter wave antenna provided in an embodiment of the present invention.

[0028] Figure 2 It is a schematic diagram of the first layer structure of the millimeter wave antenna for dual-polarization operation provided by an embodiment of the present invention.

[0029] Figure 3 It is a schematic diagram of the second layer structure of the millimeter wave antenna for dual polarization operation provided by an embodiment of the present invention.

[0030] Figure 4 It is a schematic diagram of the third layer structure of the millimeter wave antenna for dual polarization operation provided by an embodiment of the present invention.

[0031] Figure 5 It is a schematic diagram of the fourth layer structure of the millimeter wave antenna for dual-polarization operation provided by an embodiment of the present invention.

[0032] Figure 6 It is a return loss diagram of the millimeter wave antenna operating in dual polarization provided by an embodiment of the present invention.

[0033] Figure 7 It is a graph showing the change of the isolation of the dual feed provided by the embodiment of the present invention with respect to the operating frequency. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the embodiments, but are not intended to limit the present invention.

[0035] Please refer to Figures 1 to 5The embodiment of the present invention provides a dual-polarization millimeter wave antenna, including a multi-layer substrate 10, a first disk 11, a second disk 12, a first arc 13, a second arc 14, a third disk 15, a ground plane 16, a first feed line 17, and a second feed line 18. The multi-layer substrate 10 has a first layer 101, a second layer 102, a third layer 103, and a fourth layer 104. Figure 1 The stacking diagram in the second layer 102 is for illustration only and is not a cross-sectional diagram drawn to scale. Please refer to the text description of the embodiment and compare Figures 2 to 5 The first disc 11 is on the first layer 101, and has a first feed end 111 and a second feed end 112. The distance between the first feed end 111 and the first center C1 of the first disc 11 is the same as the distance between the second feed end 112 and the first center C1. The angle between the first feed end 111 and the second feed end 112 is equal to 90 degrees. The second disc 12 is on the second layer 102 and is located directly below the first disc 11. It has a second center C2, and its radius is smaller than that of the first disc 11. The first arc 13 is on the second layer 102, and is arranged outside the second disc 12 with the second center C2 as the center and a radius greater than that of the second disc 12. It has a first end 131 and a second end 132. The second arc 14 is on the second layer 102, and its center, radius and length are the same as those of the first arc 13, and has a first end 141 and a second end 142, wherein the second end 132 of the first arc 13 and the second end 142 of the second arc 14 are close to each other. The third disk 15 is on the third layer 103, located directly below the second disk 12, and is larger than the first disk 11. In addition, a conductor column CL connects the first center C1, the second center C2 and the third center C3 of the third disk 15. Figure 1 A cylinder is used to represent the structure that passes through the center of the circle connecting the three disks. The ground plane 16 is on the fourth layer 104. The first feed line 17 passes through the ground plane 16 and the third disk 15 using a through hole (through the through hole but not connected), and connects the first end 131 of the first arc 13 to connect the first feeding end 111. The second feed line 18 passes through the ground plane 16 and the third disk 15 using a through hole (through the through hole but not connected), and connects the first end 141 of the second arc 14 to connect the second feeding end 112. The above-mentioned disks and arcs are conductors, preferably copper. The above-mentioned first disk 11 is the main radiation part of the antenna, and the third disk 15 is a coupling antenna.

[0036] The detailed connection method using the through hole is explained as follows: the first feed line 17 passes through the through hole without connecting the ground plane 16 and the third disk 15, passes through and connects the first end 131 of the first arc 13 to connect the first feeding end 111. The second feed line 18 passes through the through hole without connecting the ground plane 16 and the third disk 15, passes through and connects the first end 141 of the second arc 14 to connect the second feeding end 112. The method of passing through the through hole without connecting is, for example, that the ground plane 16 and the third disk 15 each have a hole near the through hole, and the radius of the hole is greater than the radius of the through hole. The method of passing through the through hole and connecting is, for example, that the first end 131 of the first arc 13 (or the first end 141 of the second arc 14) is originally flat and has no hole, and when the first feed line 17 passes through the first end 131 (or the second feed line 18 passes through the first end 141), a hole with the same opening radius is formed to connect naturally.

[0037] The antenna structure further includes a first conductor frame 19a, a second conductor frame 19b and a third conductor frame 19c of the same size, wherein the first conductor frame 19a is disposed on the first layer 101 and surrounds the first circular disk 11, the second conductor frame 19b is disposed on the second layer 102 and surrounds the second circular disk 12, the first circular arc 13 and the second circular arc 14, and the third conductor frame 19c is disposed around the third circular disk 15. The conductor frame is used to improve the precision of the lamination of the multilayer board structure, so that the size and position of the antenna in the manufacturing process can be more accurate, and the yield rate of the mass production of the antenna can be greatly improved without significantly increasing the production cost.

[0038] The dual-polarized millimeter wave antenna of this embodiment operates at 28 GHz. It provides two polarized working modes, the first polarization direction is parallel to the X-axis, and the reference Figure 2 , the first polarization is excited by the signal of the first feeding end 111. The second polarization direction is parallel to the Y axis, reference Figure 2, this second polarization is excited by the signal of the second feed end 112. The application frequency band of 28GHz includes the n257 and n258 frequency bands, but the applicable frequency band of the present antenna is not limited thereto. In order to achieve operation in the n257 and n258 frequency bands, the preferred antenna dimensions are as follows: the radius of the first disk 11 is 61.5 mils, the radius of the second disk 12 is 47.5 mils, the radius of the third disk 15 is 101.5 mils, the first feed end 111 and the second feed end 112 are 7.8 mils away from the circumference of the first disk 11, and the diameter of the through hole used by the first feed line 17 and the second feed line 18 is 12 mils. Furthermore, preferably, the substrate between the first layer 101 and the second layer 102 is RO-4350B, and the distance between the first layer 101 and the second layer 102 is 19.7 mils; wherein, the substrate between the second layer 102 and the third layer 103 is RO-4450F, and the distance between the second layer 102 and the third layer 103 is 7.9 mils; wherein, the substrate between the third layer 103 and the fourth layer 104 is RO-4350B, and the distance between the third layer 103 and the fourth layer 104 is 19.7 mils. Furthermore, preferably, the first layer 101, the second layer 102, the third layer 103 and the fourth layer 104 are all copper, and the thickness is 1.4 mils. In the required frequency band of the design, the return loss of the applied frequency reaches less than 10dB, reference Figure 6 In addition, the isolation between the two inputs reaches 15dB. Figure 7 .

[0039] The third disk 15 is a parasitic antenna, which is mainly used to couple the energy of the two feeds and provide more operating modes. In order to improve the isolation between the two feeds, the second disk 12, the conductor column CL, the first arc 13 and the second arc 14 are used to improve the isolation between the first feed end 111 and the second feed end 112. Furthermore, the first arc 13 and the second arc 14 together constitute a 3 / 4 arc with a middle break. Furthermore, since the first arc 13 and the second arc 14 are outside the second disk 12 (that is, the radius of the first arc 13 and the second arc 14 is greater than the radius of the second disk 12), and the first feed line 17 connects the first arc 13, and the second feed line 18 connects the second arc 14, the radius of the second disk 12 is smaller than the distance between the first feed end 111 and the first center C1. That is, the radius of the second disk 12 is also smaller than the distance between the second feed end 112 and the first center C1.

[0040] In summary, the dual-polarized millimeter wave antenna provided in the embodiment of the present invention utilizes a coupled third disk, a conductive second disk and a stacked structure of two arcs to not only reduce the antenna area, but also improve the isolation between its dual feeds, and has high industrial application value.

Claims

1. A millimeter wave antenna operating in dual polarization, characterized in that: include: A multi-layer substrate having a first layer, a second layer, a third layer and a fourth layer; A first circular disk, on the first layer, having a first feeding end and a second feeding end, wherein the distance between the first feeding end and the first center of the first circular disk is the same as the distance between the second feeding end and the first center of the first circle, and the angle between the first feeding end and the second feeding end is equal to 90 degrees; A second circular disk, located on the second layer and directly below the first circular disk, smaller than the first circular disk, and having a radius smaller than a distance between the first feeding end and the first center of the circle; A first arc, in the second layer, with the second center of the second disk as the center and a radius greater than the radius of the second disk, is disposed outside the second disk and has a first end and a second end; a second arc, in the second layer, having the same center, radius and length as the first arc, and having a first end and a second end, wherein the second end of the first arc and the second end of the second arc are close to each other; A third disk, located on the third layer, directly below the second disk, and larger than the first disk, wherein a conductor column connects the first center, the second center, and the third center of the third disk, and the third disk is a parasitic antenna for coupling fed energy; A ground plane, on the fourth layer; A first feed line, passing through the ground plane and the third disk by means of a through hole, and connecting the first end of the first arc to connect to the first feeding end; as well as The second feed line passes through the ground plane and the third disk through a through hole and is connected to the first end of the second arc to connect to the second feeding end.

2. The dual-polarization millimeter wave antenna according to claim 1, characterized in that: It includes a first conductor frame, a second conductor frame and a third conductor frame of the same size. The first conductor frame is arranged on the first layer and surrounds the first disk. The second conductor frame is arranged on the second layer and surrounds the second disk, the first arc and the second arc. The third conductor frame is arranged on the third disk.

3. The dual-polarization millimeter wave antenna according to claim 1, characterized in that: The dual polarization operating millimeter wave antenna operates at 28 GHz.

4. The dual-polarization millimeter wave antenna according to claim 1, characterized in that: The second disk, the conductor column, the first arc and the second arc are used to improve the isolation between the first feeding end and the second feeding end.

5. The dual-polarization millimeter wave antenna according to claim 1, characterized in that: The radius of the first disk is 61.5 mils, the radius of the second disk is 47.5 mils, and the radius of the third disk is 101.5 mils. The first feed end and the second feed end are 7.8 mils away from the circumference of the first disk. The diameter of the through hole used by the first feed line and the second feed line is 12 mils.

6. The dual-polarization millimeter wave antenna according to claim 1, characterized in that: The substrate between the first layer and the second layer is RO-4350B, and the distance between the first layer and the second layer is 19.7 mils; the substrate between the second layer and the third layer is RO-4450F, and the distance between the second layer and the third layer is 7.9 mils; the substrate between the third layer and the fourth layer is RO-4350B, and the distance between the third layer and the fourth layer is 19.7 mils.

7. The dual-polarization millimeter wave antenna according to claim 1, characterized in that: The first layer, the second layer, the third layer and the fourth layer are all copper and have a thickness of 1.4 mils.

8. The dual-polarization millimeter wave antenna according to claim 1, characterized in that: The first circular arc and the second circular arc together form a 3 / 4 circular arc with a middle break.

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