WO2015000146A1

WO2015000146A1 - Signal reflector

Info

Publication number: WO2015000146A1
Application number: PCT/CN2013/078747
Authority: WO
Inventors: 蔡云龙
Original assignee: 华为技术有限公司
Priority date: 2013-07-03
Filing date: 2013-07-03
Publication date: 2015-01-08

Abstract

Disclosed is a signal reflector, comprising at least one convex reflecting surface; the convex reflecting surface comprises at least one reflecting section, and the length of the reflecting section is associated with the half power beam width (HPBW) of the transmitting end of an aerial and the maximum wavelength of an electromagnetic wave transmitted by the transmitting end. The convex structure of the signal reflector of an embodiment of the present invention can increase the coverage area of communication signals when Terahertz (Thz) signals do not have line of sight (LOS), thus ensuring efficient communication.

Description

Signal reflector

The present invention relates to the field of communications technologies, and in particular, to a signal reflector.

Background technique

High-frequency electromagnetic waves, such as those with frequencies between 100 GHz and 3000 GHz, can be called terahertz signals (Terahertz, THz). Due to the very high frequency, the THz signal can have a free space attenuation of up to 80dB/m. In this way, since the indoor signal attenuation is very large, the antenna needs to provide about 36dBi (required at the transceiver end) gain to offset the free space loss. This results in a very narrow beam of the antenna, and the half power beam width (HPBW) is generally around 2 to 10 degrees.

In practical applications, there are many scenarios in which the transmitted signals are communicated. Since the presence of the talker leads to the absence of a line of sight (LOS), it is necessary to use a non-LOS path to aid communication. Since THz communication requires a high-gain antenna, the beam of the antenna is very narrow, and is about 2 to 10 degrees. In order to increase the coverage of the communication, a flat reflector is generally placed indoors.

In the research and practice of the prior art, the inventors of the present invention found that since the THz beam is very narrow, the scheme of placing a planar reflector indoors can only be "illuminated" (the portion where the wireless signal can reach) A small part of the area. That is, when there is no direct path condition, the use of a planar reflector does not effectively cover more areas.

Summary of the invention

Embodiments of the present invention provide a signal reflector that can increase a coverage area of a communication signal when a terahertz signal does not have a direct path, thereby ensuring efficient communication.

A first aspect of the present invention provides a signal reflector, including:

At least one convex reflecting surface,

The convex reflecting surface comprises at least one reflecting segment surface, the length of the reflecting segment surface being associated with a half power lobe width of the transmitting end antenna and a maximum wavelength of electromagnetic waves emitted by the transmitting end.

With reference to the first aspect, in a first possible implementation manner, when the convex reflective surface includes a plurality of reflective segment surfaces, the reflective segment surface is a plane. In conjunction with the first aspect, in a second possible implementation, the number of reflective segment faces is associated with the half power lobe width.

In conjunction with the second possible implementation of the first aspect, in a third possible implementation, the number of the reflective segment faces is inversely proportional to the half power lobe width.

With reference to the first aspect, any one of the first to third possible implementation manners of the first aspect, in a fourth possible implementation, the diameter of the signal reflector is half of the antenna of the transmitting end The power lobe width is associated with the distance of the transmitting end from the signal reflector.

In conjunction with the fourth possible implementation of the first aspect, in a fifth possible implementation, the diameter of the signal reflector is greater than or equal to twice the inverse tangent of half the width of the half power lobe.

With reference to the first aspect, any one of the first to third possible implementation manners of the first aspect, in a sixth possible implementation, the length of the reflective segment surface is not less than two of the maximum wavelengths Times.

In conjunction with the sixth possible implementation of the first aspect, in a seventh possible implementation, the length of the reflective segment surface is between twice the maximum wavelength and five times the maximum wavelength.

The embodiment of the invention adopts a signal reflector, comprising: at least one convex reflecting surface, wherein the convex reflecting surface comprises at least one reflecting segment surface, the length of the reflecting segment surface and the half power lobe width of the transmitting end antenna and the The maximum wavelength correlation of the electromagnetic waves emitted by the transmitting end. Compared with the small area covered by the planar reflector in the prior art, the convex structure of the signal reflector provided by the embodiment of the invention can increase the coverage area of the communication signal when the terahertz signal does not have a direct path, thereby ensuring high efficiency. Communication.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings may be obtained according to these drawings without any creative work.

1 is a schematic structural view of a signal reflector in an embodiment of the present invention;

2 is another schematic structural view of a signal reflector in an embodiment of the present invention;

3 is another schematic structural view of a signal reflector in an embodiment of the present invention; 4 is another schematic structural view of a signal reflector in an embodiment of the present invention;

FIG. 5 is a schematic diagram showing the principle of calculating the diameter of the reflector in the embodiment of the present invention; FIG.

6 is another schematic structural diagram of a signal reflector in an embodiment of the present invention;

Fig. 7 is a schematic view showing another structure of a signal reflector in an embodiment of the present invention.

detailed description

Embodiments of the present invention provide a signal reflector that can increase a coverage area of a communication signal when a terahertz signal does not have a direct path, thereby ensuring efficient communication. The details are described below.

BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Referring to FIG. 1 , FIG. 1 is a schematic structural diagram of a signal reflector according to an embodiment of the present invention. The signal reflector includes: a convex reflecting surface 10, and the convex reflecting surface in FIG. 1 is semicircular. In fact, The shape of the reflective surface 10 is not limited. For one, it can be multiple.

Half Power Beam Width (HPBW) The lobe width is a very important parameter commonly used in directional antennas. It refers to the width of the angle between the antenna and the radiation pattern below the peak of 3dB. The radiation pattern of the antenna. It is an indicator for measuring the ability of an antenna to transmit and receive signals in all directions. It is usually expressed graphically as the relationship between power intensity and angle. There are usually two or more flaps in the pattern, the largest of which is called the main lobe and the other is called the side lobe. The angle between the power points of the two main halves is defined as the lobe width of the antenna pattern. It is called the half power (angle) width. The narrower the main lobe width, the better the directivity and the stronger the anti-interference ability.

The number of reflective segment faces is associated with the half power lobe width, for example: the number of reflective segment faces is inversely proportional to the half power lobe width. When HPBW = 6, the reflector can have 180/Θ blocks, each with an angle of beam width. Due to the divergence of electromagnetic waves, the reflector can cover the entire beam. The reflecting surface in each block is a reflecting segment surface 101, and the length of the reflecting segment surface can be calculated according to the maximum wavelength of the electromagnetic wave emitted by the transmitting end. Compared with the small area covered by the planar reflector in the prior art, the convex structure of the signal reflector provided by the embodiment of the invention can increase the coverage area of the communication signal when the terahertz signal does not have a direct path, thereby ensuring high efficiency. Communication.

Referring to FIG. 2, the signal reflector shown in FIG. 2 includes three convex reflecting surfaces 10. In fact, in the embodiment of the present invention, the number of convex reflecting surfaces 10 in one reflector is not limited, and may be one. Can be multiple.

Referring to FIG. 3, the signal reflector shown in FIG. 3 includes a convex reflecting surface 10, and the convex reflecting surface 10 includes six reflecting segment faces 101, each reflecting segment face 101 being a flat surface instead of a convex surface, so that Reduce the difficulty of processing.

Referring to Fig. 4, the signal reflector shown in Fig. 3 includes three convex reflecting faces 10, each of which includes six planar reflecting segment faces. Actually, in the embodiment of the present invention, the number of the convex reflecting surfaces 10 in one reflector is not limited, and may be one or plural.

In fact, the above Figures 1 - 4 are for clarity. Only six reflective segment faces 101 are drawn on the graph. In fact, the half-power lobe width 6 is usually 2 to 10 degrees. Thus, a reflector is usually There will be more than a dozen to dozens.

In the embodiment of the invention, the diameter of the signal reflector is associated with the half power lobe width of the transmitting end antenna and the distance of the transmitting end from the signal reflector. The diameter of the signal reflector can be greater than or equal to twice the inverse tangent of half the width of the half power lobe. Referring to Figure 5, when the normal half power lobe width Θ = 1.5 degrees, the area where the radiation signal can be obtained at 10 meters is 8.3 cm in diameter. Thus, when the signal reflector is mounted at 10 meters, the signal reflector can be 8.3 cm in diameter or greater than 8.3 cm.

Referring to FIG. 6, the reflector provided by the embodiment of the present invention is applicable to an indoor communication scenario, and the size of the Acess Point (AP) projected onto the transmitter is determined by the half power lobe width. Assuming that the AP-to-reflector distance is 3~5m and the electromagnetic wave half-lobe width is 2 degrees to 10 degrees, the maximum size of the electromagnetic wave projection area emitted by the AP is limited to: 17.5cm ~ 87cm. Taking the minimum electromagnetic wave projection area of 17.5 cm as an example, in order for the AP to be more likely to cover the reflector, the emitter is smaller than the projected area, and the reflector size can limit about half of the projection surface, that is, the diameter of the reflector is Below 7.6cm.

In the embodiment of the invention, the length of the reflective segment surface is not less than twice the maximum wavelength, preferably twice Between five times the maximum wavelength. Referring to Figure 7, the reflector needs to be sized to ensure effective reflection. Ideally, an approximately infinite plane is used to approximate the ideal reflection surface. The wireless large plane cannot be realized in practice. In practical applications, the reflective surface with sufficient reflection effect can be selected according to the wavelength of the center frequency of the working electromagnetic wave. The maximum wavelength of the electromagnetic wave in the embodiment of the present invention is the wavelength of the center frequency of the working electromagnetic wave. In the transmitter of the THZ indoor communication, the size of each reflecting segment surface of the reflector can be determined according to the wavelength. According to the simulation result, the minimum can be 2 The multiple wavelength, ie 2 λ, can usually take a wavelength of 2~5 λ, which is of course the lower limit. This ensures that there is sufficient area for reflection in addition to the edge scattering diffraction.

Compared with the small area covered by the planar reflector in the prior art, the convex structure of the signal reflector provided by the embodiment of the invention can increase the coverage area of the communication signal when the terahertz signal does not have a direct path, thereby ensuring high efficiency. Communication.

The signal reflector provided by the embodiment of the present invention is described in detail above. The principle and the embodiment of the present invention are described in the following. The description of the above embodiment is only used to help understand the method of the present invention and At the same time, there will be changes in the specific embodiments and the scope of application according to the idea of the present invention, and the contents of the present specification should not be construed as limiting the present invention. .

Claims

Rights request

1. A signal reflector, characterized in that it includes:

at least one convex reflective surface,

The convex reflective surface includes at least one reflective segment surface, and the length of the reflective segment surface is related to the half-power beam width of the transmitting end antenna and the maximum wavelength of the electromagnetic wave emitted by the transmitting end.

2. The signal reflector according to claim 1, characterized in that when the convex reflective surface includes a plurality of reflective segment surfaces, the reflective segment surfaces are flat.

3. The signal reflector according to claim 1, characterized in that the number of the reflection segment surfaces is related to the half-power lobe width.

4. The signal reflector according to claim 3, characterized in that the number of the reflection segment surfaces is inversely proportional to the half-power lobe width.

5. The signal reflector according to any one of claims 1 to 4, characterized in that, the diameter of the signal reflector is equal to the half-power beam width of the transmitting end antenna and the difference between the transmitting end and the signal reflection The huge relationship between devices.

6. The signal reflector according to claim 5, wherein the diameter of the signal reflector is greater than or equal to twice the arc tangent of half the half-power lobe width.

7. The signal reflector according to any one of claims 1 to 4, characterized in that the length of the reflection segment surface is not less than twice the maximum wavelength.

8. The signal reflector according to claim 7, characterized in that the length of the reflection segment surface is between twice the maximum wavelength and five times the maximum wavelength.