WO2021033841A1

WO2021033841A1 - Dipole antenna array for millimeter wave band wireless communication

Info

Publication number: WO2021033841A1
Application number: PCT/KR2019/016085
Authority: WO
Inventors: 한영하; 나승현; 정현
Original assignee: (주)밀리웨이브
Priority date: 2019-08-20
Filing date: 2019-11-22
Publication date: 2021-02-25
Also published as: KR102215275B1

Abstract

A dipole antenna array for millimeter wave band wireless communication according to the present invention comprises: a dielectric substrate including a multi-layered dielectric layer; and a plurality of dipole antennas arranged on the dielectric substrate, wherein the dielectric substrate comprises a first dielectric layer and a second dielectric layer below the first dielectric layer, and each of the plurality of dipole antennas comprises: a power feeding line disposed on the first dielectric layer; a first radiation line disposed on the first dielectric layer and extending in a first direction from a distal end of the power feeding line; and a second radiation line disposed on the second dielectric layer, having one end disposed below the distal end of the power feeding line, and extending in a second direction from the one end.

Description

Dipole antenna array for millimeter wave band wireless communication

The present invention relates to a dipole antenna array for wireless communication, and more particularly, to a dipole antenna array for millimeter wave band wireless communication of 60 GHz band.

In a global situation where radio frequency resources used for communication are increasingly depleted, the 60GHz-based millimeter wave band (57~66GHz) is allocated as a license-exempt band in Korea, Japan, the United States, Canada, and Europe. Interest in its use is focused. In addition to the advantage that it can be used worldwide without interference with other wireless communication systems, it is easy to use a communication technology with low frequency efficiency by using a continuous frequency band of at least 7GHz. )'can be built.

The most important advantage of 60GHz is that it enables wideband signal transmission. Since the higher the frequency, the more the signal can be transmitted by occupying a wider band, so when transmitting a signal using a 60GHz frequency, for example, if the signal is transmitted by occupying 5% of the center frequency, the signal can be transmitted in the 3GHz frequency band. Even if a signal is simply transmitted with /Hz frequency efficiency, wireless data transmission is possible at a transmission rate of 3 gigabits per second.

In addition, since a wireless circuit is generally implemented in relation to a wavelength, the size of the circuit may be reduced in inverse proportion to the frequency. That is, a circuit using a frequency of 60 GHz is advantageous for miniaturization. Since most of the wireless devices are oriented toward mobility, it has a great advantage if a small and light circuit can be implemented. Moreover, since the antenna can be included in the package, the wireless device can be implemented in one package without external additional elements.

Due to the nature of 60GHz radio waves, beamforming technology is indispensable because it must be able to transmit signals without interruption even against radio interference. The beamforming technology is a technology that realizes high-quality wireless communication by adjusting the antenna beam direction to a direction with good signal quality to obtain a transmission/reception gain. In order to implement the beamforming technology, additional antennas and RF signal paths are required as many as the number of beam widths for the total angle of transmission and reception to be accommodated. Therefore, it is necessary to efficiently design a space for antenna arrangement and to minimize interference between antennas in a limited space to form an antenna array in which a plurality of antennas are arranged.

The technical problem to be achieved by the present invention is to provide a dipole antenna array for millimeter wave band wireless communication of 60 GHz band, which can efficiently design a space for antenna arrangement and minimize interference between antennas in a limited space. .

A dipole antenna array for millimeter wave band wireless communication according to the present invention for solving the above technical problem comprises: a dielectric substrate comprising a multilayer dielectric layer; And a plurality of dipole antennas arranged on the dielectric substrate, wherein the dielectric substrate includes a first dielectric layer and a second dielectric layer below the first dielectric layer, and each of the plurality of dipole antennas is on the first dielectric layer. A power supply line disposed in the; A first radiation line disposed on the first dielectric layer and extending in a first direction from an end of the power supply line; And a second radiation line disposed on the second dielectric layer and having one end positioned below the end of the power supply line and extending in a second direction from the one end.

The second radiation line may be independently disposed without being electrically connected to other circuit elements.

Due to the capacitive coupling between the power supply line and the second radiation line via the first dielectric layer, a current having a phase difference of 180 degrees from the current flowing through the power supply line may flow through the second radiation line. have.

Two dipole antennas adjacent to each other among the plurality of dipole antennas may be disposed such that the first radiation line of one dipole antenna and the second radiation line of the other dipole antenna are adjacent to each other.

The dielectric substrate may be made of an FR4 material.

The first direction and the second direction may be opposite to each other.

The plurality of dipole antennas include a first dipole antenna set consisting of dipole antennas arranged in one direction, a second dipole antenna set consisting of dipole antennas arranged in another direction, and a second dipole antenna set arranged in another direction. A third dipole antenna set made of dipole antennas may be configured.

According to the present invention described above, it is possible to efficiently design a space for antenna arrangement and to minimize interference between antennas in a limited space, it is possible to provide a dipole antenna array for a millimeter wave band wireless communication of a 60 GHz band.

1 shows the overall structure of a dipole antenna array for millimeter wave band wireless communication according to an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating a beam formed by the dipole antenna array of FIG. 1.

3 is a plan view of the dipole antenna array of FIG. 1.

4 shows a detailed structure of a dipole antenna constituting the dipole antenna array of FIG. 1.

5 is a cross-sectional view of a dipole antenna array module according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In the following description and the accompanying drawings, substantially the same components are denoted by the same reference numerals, and redundant descriptions will be omitted. In addition, when it is determined that a detailed description of known functions or configurations related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

The dipole antenna array according to the present embodiment may include a dielectric substrate 10 made of a multilayer dielectric layer and a plurality of dipole antennas 20-1, ..., 20-16 arranged on the dielectric substrate 10. have.

The dielectric substrate 10 may be composed of, for example, 5 layers of dielectric layers and 6 layers of circuit layers. Each dielectric layer may be made of FR4 material, and each circuit layer may be made of copper material.

The plurality of dipole antennas 20-1, ..., 20-16 may be divided into three dipole antenna sets, for example, so that each dipole antenna set may form beams in different directions. For example, the dipole antennas 20-1, ..., 20-6 are arranged along the x direction toward the y direction to form a first dipole antenna set, and the dipole antennas 20-7, .. ., 20-10) are arranged along the y direction toward the x direction to constitute a second dipole antenna set, and the dipole antennas 20-11, ..., 20-17 are x toward the y direction. Columns along the direction may constitute a third antenna set.

FIG. 2 is a schematic diagram illustrating a beam formed by the dipole antenna array of FIG. 1. As shown, the first dipole antenna set forms a beam in the y direction, the second dipole antenna set forms a beam in the x direction, and the third dipole antenna set forms a beam in the y direction. can do.

3 is a plan view of the dipole antenna array of FIG. 1, and FIG. 4 shows a specific structure of each dipole antenna 20-1, ..., 20-16, hereinafter unified with reference numeral 20 for convenience, constituting the dipole antenna array. . For convenience, FIG. 4 shows a dipole antenna 20 facing the x direction.

In FIG. 3, a part marked in green indicates a first-layer (top layer) circuit, and a part marked in blue indicates a two-layer circuit located below the first floor. The one-layer circuit is disposed on the first dielectric layer 11 and the two-layer circuit is disposed on the second dielectric layer 12 under the first dielectric layer 11.

3 and 4, the dielectric substrate 10 includes a first dielectric layer 11 and a second dielectric layer 12 under the first dielectric layer 11, and the dipole antenna 20 includes a feed line 21 ), a first radiation line 22 and a second radiation line 23.

The power supply line 21 is disposed on the first dielectric layer 11 along the x direction. The power supply line 21 is connected to a circuit element of the first-layer circuit to apply a current.

The first radiation line 22 is disposed on the first dielectric layer 11 so as to be connected to the end of the power supply line 21, and from the end of the power supply line 21 in the ??y direction (that is, perpendicular to the power supply line 21). Direction). The length of the first radiation line 22 is about λ/4.

The second radiation line 23 is disposed on the second dielectric layer 12 in a different layer from the feed line 21 and the first radiation line 22. The second radiation lines 23 are not electrically connected to other circuit elements and are arranged independently. That is, a separate feed line is not connected to the second radiation line 23. One end of the second radiation line 23 is located below the end of the feed line 21, and from one end in the y direction (ie, a direction perpendicular to the feed line 21, opposite to the first radiation line 22) Is extended to The length of the second radiation line 23 is about λ/4, and the total length of the first radiation line 22 and the second radiation line 23 is about λ/2.

When a current is applied to the feed line 21, a current in phase with the feed line 21 flows through the first radiation line 22 connected to the feed line 21. On the other hand, the second radiation line 23 is not connected to the power supply line 21 and the first radiation line 22, but the power supply line 21 and the second radiation line through the first dielectric layer 11 ( Due to the capacitive coupling between 23), a current having a phase difference of 180 degrees from the current flowing through the power supply line 21 flows through the second radiation line 23. That is, a current having a phase difference of 180 degrees from each other flows through the first radiation line 22 and the second radiation line 23. Accordingly, a current having a phase difference of 180 degrees from the first radiation line 22 can flow through the second radiation line 23 without a separate feed line. As such, since a separate feed line for the second radiation line 23 is not required, a space for antenna arrangement can be efficiently designed.

In addition, referring to FIGS. 1 and 3, two dipole antennas adjacent to each other among the dipole antennas 20-1, ..., 20-16 are the first radiation line 22 of one dipole antenna and the second dipole antenna. 2 The radiation lines 23 are arranged to be adjacent to each other. When dipole antennas are arranged in a narrow space, radio wave interference may occur between adjacent dipole antennas. According to an embodiment of the present invention, portions adjacent to each other between adjacent dipole antennas are different from the first radiation line 22 of one dipole antenna. Since the antenna is located on different layers as the second radiation lines 23, radio wave interference between dipole antennas can be improved compared to a case where adjacent portions are located on the same floor.

5 is a cross-sectional view of a dipole antenna array module according to an embodiment of the present invention. The dipole antenna array module includes a dielectric substrate 10 composed of first to fifth dielectric layers 11, 12, 13, 14, 15, a one-layer circuit 31, a two-layer circuit 32, and a three- and four-layer circuit. (Not shown), a circuit layer 30 comprising a five-layer circuit 35 and a six-layer circuit 36, and a via 40 comprising

vias

41 and 42 connecting the layers of the circuit layer 30 It may include. The power supply line 21 and the first radiation line 22 may be part of the first layer circuit 31, and the second radiation line 23 may be part of the second layer circuit 32.

The first to fifth dielectric layers 11, 12, 13, 14, and 15 may be made of FR4 material, and the circuit layer 30 and via 40 may be made of copper material. For example, the thickness of the first, second, third, and fifth

dielectric layers

11, 12, 13, 15 may be 0.0762 mm, the thickness of the fourth dielectric layer 14 may be 0.2032 mm, and the thickness of each circuit layer 30 may be 0.0355 mm. have.

So far, the present invention has been looked at around its preferred embodiments. Those of ordinary skill in the art to which the present invention pertains will be able to understand that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative point of view rather than a limiting point of view. The scope of the present invention is shown in the claims rather than the above description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

Claims

In the dipole antenna array for millimeter wave band wireless communication,

A dielectric substrate made of a multilayer dielectric layer; And

A plurality of dipole antennas arranged on the dielectric substrate,

The dielectric substrate includes a first dielectric layer and a second dielectric layer below the first dielectric layer,

Each of the plurality of dipole antennas,

A feed line disposed on the first dielectric layer;

A first radiation line disposed on the first dielectric layer and extending in a first direction from an end of the power supply line; And

A dipole antenna array comprising a second radiation line disposed on the second dielectric layer and having one end positioned below the end of the feed line and extending in a second direction from the one end.
The method of claim 1,

The second radiation lines are not electrically connected to other circuit elements and are independently disposed.
The method of claim 2,

A dipole through which a current having a phase difference of 180 degrees from a current flowing through the feed line flows through the second radiation line due to capacitive coupling between the feed line and the second radiation line via the first dielectric layer Antenna array.
The method of claim 1,

Two dipole antennas adjacent to each other among the plurality of dipole antennas are arranged such that the first radiation line of one dipole antenna and the second radiation line of another dipole antenna are adjacent to each other.
The method of claim 1,

The dielectric substrate is a dipole antenna array made of FR4 material.
The method of claim 1,

A dipole antenna array in which the first direction and the second direction are opposite to each other.
The method of claim 1,

The plurality of dipole antennas include a first dipole antenna set consisting of dipole antennas arranged in one direction, a second dipole antenna set consisting of dipole antennas arranged in another direction, and a second dipole antenna set arranged in another direction. A dipole antenna array constituting a third dipole antenna set consisting of dipole antennas.