KR20150072119A

KR20150072119A - MIMO Antenna for Human Body Communication

Info

Publication number: KR20150072119A
Application number: KR1020130159422A
Authority: KR
Inventors: 강도구; 최재훈; 박형상; 주은만; 김동탁
Original assignee: 한양대학교 산학협력단
Priority date: 2013-12-19
Filing date: 2013-12-19
Publication date: 2015-06-29

Abstract

A MIMO antenna for human body communication is disclosed. The disclosed antenna includes: a substrate; A ground plane formed on a part of the substrate; A first radiator disposed at a predetermined distance from the ground plane and formed on a first side of the substrate; A second radiator formed on a second side of the substrate, the second radiator being spaced apart from the ground plane by a predetermined distance; A first slot formed on the ground plane based on the position of the first radiator, and a second slit formed on the ground plane based on the position of the second radiator. The disclosed antenna is applicable to medical equipment used in human communication and has an advantage that it can be manufactured in a small size.

Description

[0001] MIMO Antenna for Human Body Communication [0002]

The present invention relates to an antenna, and more particularly, to a MIMO antenna for human body communication.

With the development of wireless communication technology, it has become possible to communicate with very small size and low power, and this technology makes it possible to use in a medical device that transmits and receives body information wirelessly through a transmitter in a human body and an external receiver.

As a result, research on medical devices for monitoring, diagnosis, and treatment together with a wireless human body proximity network is actively conducted. The medical device is implanted inside the human body or adjacent to the human body, and transmits biometric information to the external analysis device.

The medical devices adjacent to the human body are affected by the radiation characteristics of the human body and multipath fading occurs due to the reflection due to the surrounding environment of the human body.

Such multipath fading and the permittivity of the human body are major factors in distorting the signal.

In the multipath fading scheme, more than two signals can be independently processed using a diversity scheme, thereby ensuring more stable communication characteristics.

In order to apply the diversity technique, a MIMO antenna can be used. Such a MIMO antenna includes a plurality of radiators. In order to ensure the independency of signals emitted from the radiators, the isolation property between the radiators is very important.

Furthermore, since the medical device used in the human body must be manufactured in a small size, the structure for securing isolation can increase the size of the antenna, and a MIMO antenna suitable for a medical device applied to the human body is required.

The present invention proposes a MIMO antenna applicable to medical equipment used in human communication.

Also, the present invention proposes a MIMO antenna for a medical instrument for human body communication which can be manufactured in a small size.

According to an aspect of the present invention, there is provided a plasma display panel comprising: a substrate; A ground plane formed on a part of the substrate; A first radiator disposed at a predetermined distance from the ground plane and formed on a first side of the substrate; A second radiator formed on a second side of the substrate, the second radiator being spaced apart from the ground plane by a predetermined distance; A first slot formed on the ground plane based on the position of the first radiator, and a second slit formed on the ground plane based on the position of the second radiator.

The first slit and the second slit are in a shape of a letter shape and one end is opened.

The first slit and the second slit are formed in a bilaterally symmetrical structure.

The antenna of the present invention is applicable to medical equipment used for human body communication and has an advantage that it can be manufactured in a small size.

1 illustrates a structure of a MIMO antenna for human body communication according to an embodiment of the present invention.
2 is a view illustrating a radiator structure applied to a MIMO antenna according to an embodiment of the present invention.
3 is a graph showing S parameters of an antenna according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a structure of a MIMO antenna for human body communication according to an embodiment of the present invention.

Referring to FIG. 1, a MIMO antenna for human body communication according to an embodiment of the present invention includes a first radiator 100, a second radiator 110, a ground plane 120, a first slit 130, Two slits 132, and a substrate 140. [

The first radiator (100) and the second radiator (110) are disposed on both sides of the substrate (140). According to a preferred embodiment of the present invention, the first radiator 100 and the second radiator 110 have the same structure, but are not limited thereto. That is, it is preferable that the first radiator 100 and the second radiator 110 have the same shape, but if necessary, radiators having different structures may be used as the first radiator 100 and the second radiator 110, respectively will be.

The first radiator 100 and the second radiator 110 independently transmit and receive signals, and the feed points are also formed independently. The first radiator 100 receives a signal through the first feed point F1 and the second radiator 110 receives a signal through the second feed point F2.

2 is a view illustrating a radiator structure applied to a MIMO antenna according to an embodiment of the present invention.

2, a radiator (first radiator and second radiator) applied to a MIMO antenna according to an embodiment of the present invention includes a first conductive line 200 extending from a feed point F, And a second conductive line 202 that branches from line 200 and is electrically coupled to ground plane 120.

The length of the first conductive line 200 is determined by the required resonant frequency and may have a number of folded structures to minimize the area occupied by the first conductive line 200.

The second conductive line 202 couples the first conductive line 200 to the ground plane 120 and the second conductive line 202 connects the radiator of the MIMO antenna according to an embodiment of the present invention to a PIFA Inverted F Antenna.

1, the first radiator 100 and the second radiator 110 are arranged in a bilaterally symmetrical structure, and the first radiator 100 and the second radiator 110 are arranged as far as possible Is disposed to fall.

Since the first and second radiators 100 and 110 are located within a distance affecting each other, interference occurs due to a signal radiated from each radiator. To this end, an isolation structure is generally used for a MIMO antenna.

This isolation structure is primarily provided between the two radiators and operates to minimize the effect of the radiation emitted by each radiator on the other radiator. However, since the isolation structure increases the size of the antenna, it is difficult to apply it to a human body communication antenna which needs to be manufactured in a small size.

According to the embodiment of the present invention, a plurality of radiators (for example, in this embodiment, the first slit 130 (not shown) is formed on the ground plane 120 to ensure independence between the first radiator 100 and the second radiator 110, And the second slit 140 are formed.

The first slit 130 is formed on the left side of the ground plane 120 based on the position of the first radiator 100 and the second slit 140 is formed on the ground plane 120 based on the position of the second radiator 110. [ 120).

The open ends of the first slit 130 and the second slit 140 have a structure in which one end is opened and the open ends of the first slit 130 and the second slit 140 are connected to both ends of the ground plane 120 Side.

Also, it is preferable that the first slit 130 and the second slit 140 have a two-dimensional structure, and it is possible to secure the best isolation characteristic when the first slit 130 and the second slit 140 have a two-dimensional structure.

In addition, the first slit 130 and the second slit 140 preferably have a bilaterally symmetrical structure with respect to a central portion of the substrate.

The first slit 130 and the second slit 140 formed on the ground plane 120 function to improve the degree of isolation between the first radiator 100 and the second radiator 110.

It is possible to secure the isolation characteristic with the miniaturized structure as compared with the conventional technique using the separate isolation structure in order to secure the isolation characteristic by forming the slits 130 and 140 on the existing ground plane 110.

The ground plane 120 and the radiators 100 and 110 are formed on the substrate 140. The substrate 140 is made of a dielectric material. The permittivity of the substrate can be determined according to the radiation characteristic and the radiation frequency, for example, FR4 substrate can be used.

3 is a graph showing S parameters of an antenna according to an embodiment of the present invention.

3 shows the S parameter measured by the human phantom, the S parameter measured without the phantom, and the S parameter measured when the slit is not formed, respectively, and the S11 parameter and the S21 parameter are shown.

It can be seen that the isolation characteristics are improved when the slits are formed through the S21 parameter shown in FIG.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and specific embodiments and drawings. However, it should be understood that the present invention is not limited to the above- And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

Claims

Board;
A ground plane formed on a part of the substrate;
A first radiator disposed at a predetermined distance from the ground plane and formed on a first side of the substrate;
A second radiator formed on a second side of the substrate, the second radiator being spaced apart from the ground plane by a predetermined distance;
And a second slit formed on the ground plane based on a position of the second radiator and a first slot formed on the ground plane based on the position of the first radiator. .

The method according to claim 1,
Wherein the first slit and the second slit have a loop shape and are open at one end.

3. The method of claim 2,
Wherein the first slit and the second slit are formed in a bilaterally symmetrical structure.