KR20150069432A

KR20150069432A - Antenna for Wearable Device Having Small Size

Info

Publication number: KR20150069432A
Application number: KR1020130155823A
Authority: KR
Inventors: 최재훈; 탁진필
Original assignee: 한양대학교 산학협력단
Priority date: 2013-12-13
Filing date: 2013-12-13
Publication date: 2015-06-23
Also published as: KR101533160B1

Abstract

Disclosed is a human body wearable type antenna device having a miniaturized structure. The disclosed antenna comprises; a first dielectric substrate; a semicircle-type patch formed on the top of the first dielectric substrate; a semi-ring type patch which is formed on the top of the first dielectric substrate and is separated from the semicircle-type patch at a predetermined distance and surrounds a first radiation patch; and a feeding line which is combined to the lower side of the first dielectric substrate and provides a feeding signal to the semicircle-type patch through a hole. The semicircle-type patch is electrically connected with a ground at a plurality of points through a plurality of grounds via holes. According to the disclosed antenna, the antenna can be manufactured in a small size while having a surface-oriented radiation characteristic.

Description

Antenna for Wearable Device Having Small Size Antenna for Wearable Device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna, and more particularly, to an antenna used in a human wearing equipment.

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, studies on medical implantable devices and medical wearable devices for monitoring, diagnosis, and treatment together with a wireless human body proximity network are actively conducted.

Particularly, the use of wearable devices for measuring bio-signals such as heart rate worn by the body is gradually increasing. In a device for measuring bio-signals through such wearable devices, the biggest problem is that the radiation characteristics Is required.

The signals transmitted from the wearable equipment for human body monitoring must transmit signals to another wearable medical equipment (e.g., wearable equipment such as a watch), and thus the antenna used in the wearable equipment is a surface directed radiation It is necessary to have a characteristic.

In addition, the present invention proposes a human wearing antenna having a surface-oriented radiation characteristic.

In addition, the present invention proposes a human wearing antenna having a miniaturized structure.

According to an aspect of the present invention, there is provided a plasma display panel comprising: a first dielectric substrate; A semicircular patch formed on the first dielectric substrate; A semi-ring patch formed on the first dielectric substrate and spaced apart from the semicircular patch by a predetermined distance to surround the first radiation patch; And a feed line coupled to the lower portion of the first dielectric substrate and providing a feed signal to the semicircular patch through a feeding via hole, wherein the semicircular patch is electrically connected to the ground through a plurality of first grounding via holes at a plurality of points A human wearing antenna is provided.

The points electrically connected through the plurality of first grounding via holes in the semicircular patch are located at the same distance from the semicircular center of the semicircular patch.

The semi-ring patch is electrically connected to ground through a plurality of second grounding via holes at a plurality of points.

The points electrically connected through the plurality of second grounding via holes in the semi-ring patch are located at the same distance from the center of the first radiation patch.

The number of the first ground via-holes is 2, and is located on the +45 degree line and the -45 degree line from the semicircular center of the semicircular patch.

The number of the second ground via-holes is 2, and is located on the +45 degree line and the -45 degree line from the semicircular center of the semicircular patch.

The semi-circular patch has a perfect semicircular shape, and the semi-circular patch has a structure in which both ends are partially cut in a perfect semicircle.

The human body wearing type equipment antenna includes: a second dielectric substrate coupled to a lower portion of the first dielectric substrate; And a lower ground coupled to the lower portion of the second dielectric substrate.

According to another aspect of the present invention, there is provided a plasma display panel comprising: a first dielectric substrate; A semicircular patch formed on the first dielectric substrate; A semi-circular patch formed on the first dielectric substrate and spaced apart from the semi-circular patch by a predetermined distance to surround the semi-circular patch; A second dielectric substrate coupled to a lower portion of the first dielectric substrate and including a feed line for supplying a feed signal to the semicircular patch through a feed via hole, the feed line being coupled to the upper portion and coupled to the lower portion of the first dielectric substrate; And a lower ground coupled to the lower portion of the second dielectric substrate, wherein the first radiation patch is electrically connected to the lower ground via a plurality of first grounding via holes at a plurality of points .

According to the antenna of the present invention, there is an advantage that it can be manufactured in a small size while having a surface-oriented radiation characteristic.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a human wearing antenna according to an embodiment of the present invention; FIG.
2 illustrates a structure of a bottom ground according to an embodiment of the present invention;
3 is a top patch plan view of a human-wearable equipment antenna according to an embodiment of the present invention.
4 is a perspective view of a human-wearable equipment antenna according to an embodiment of the present invention.
5 is a graph illustrating return loss of a human wearing antenna according to an embodiment of the present invention.
6 is a view showing a current distribution of a human wearing antenna according to an embodiment of the present invention.
FIG. 7 is a view showing a radiation pattern of an XZ plane and a YZ plane in air of a human wearing antenna according to an embodiment of the present invention; FIG.
8 is a view showing a radiation pattern of an XZ plane and a YZ plane in a human phantom of a human wearing 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 cross-sectional view of a human wearing antenna according to an embodiment of the present invention.

1, a human body wearing type equipment antenna according to an embodiment of the present invention includes a first substrate 100, an upper patch 110 formed on a first substrate, a second substrate 120, A feeder line 130 formed between the first substrate 100 and the second substrate 120 and a lower ground 140 formed under the second substrate 120.

The first substrate 100 is made of a dielectric material having a predetermined dielectric constant. The permittivity of the first substrate 100 is determined based on the radiation frequency and radiation characteristic of the upper patch 110. As an example, a Rogers RT / duroid 5880 substrate having a dielectric constant of 2.22. Can be used as the first substrate 100.

The second substrate 120 is made of a dielectric material having a predetermined dielectric constant. The dielectric constant of the second substrate 120 is also determined based on the radiation frequency and radiation characteristics of the upper patch 110.

Of course, the first substrate 100 and the second substrate 120 may have the same permittivity, and the first substrate 100 and the second substrate 120 may be implemented as an integral structure instead of an independent substrate have.

A lower ground is coupled to the lower portion of the second substrate 120, and the lower ground 140 is made of a conductive material. The lower ground 140 provides a ground voltage to a predetermined region of the upper patch 110 and is connected to the upper patch 110 through a plurality of via holes as described later.

2 is a view illustrating a structure of a lower ground according to an embodiment of the present invention.

Referring to FIG. 2, the bottom ground 140 according to one embodiment of the present invention has a rectangular structure and may be formed over the entire area of the second substrate 120.

The upper patch 110 functions to transmit signals generated in a human wearing device to a medical device. For example, the body-worn device may be a device for measuring heart rate, and the measured heart rate information is transmitted to the medical device worn by the user through the upper patch 110.

Here, the medical equipment is a device for analyzing the condition of the wearer by receiving a signal transmitted from the human wearing equipment. For example, the medical device may be a heart rate analyzer that is worn on the user in the form of a clock.

The antenna of the present invention is an antenna for transmitting the signals of the wearable measuring equipment to the wearable medical equipment and needs to have a surface-oriented radiation characteristic.

FIG. 3 is a plan view of an upper patch of a human wearing equipment antenna according to an embodiment of the present invention, and FIG. 4 is a perspective view of a human wearing device antenna according to an embodiment of the present invention .

3 and 4, the upper patch according to an embodiment of the present invention includes a semicircular patch 300 and a semi-circular patch 302 spaced a predetermined distance from the semicircular patch 300 and surrounding the semicircular patch do.

The semicircular patch 300 is electrically connected to the feed line 130 through the feed via hole 200 and receives a feed signal from the feed line 130.

The semicircular patch 300 is electrically connected to the lower ground 140 electrically grounded via the plurality of first grounding via holes 210 and 212. That is, the semicircular patch 300 is electrically connected to the ground at a plurality of points by the plurality of first ground via holes 210 and 212. A plurality of ground connection points electrically connected to the ground through the first ground via holes 210 and 212 are located at the same distance from the semicircular center of the semicircular patch 300. That is, the distance from the semicircular center of the semicircular patch to the first ground via holes 210 and 212 is the same.

According to a preferred embodiment of the present invention, the surface oriented radiation characteristic using the TM31 mode is realized. The conventional surface-oriented radiation antenna generally implements the surface-oriented radiation characteristic using the higher-order mode of TM01 or TM02. However, when the surface-oriented radiation characteristic is implemented using these modes, the size of the antenna is increased.

The antenna of the present invention is an antenna used in wearing equipment to be worn on a human body and needs to be miniaturized in size. To achieve this, the surface oriented radiation characteristic is implemented using the TM31 mode.

3, the first ground via holes 210 and 212 are formed so that the semicylindrical patches 300 are grounded and electrically connected at two points, .

When the TM31 mode is used, the two first ground via-holes can be located in the +45 degree line and the -45 degree angle line from the semicircular center of the semicircular patch 300, respectively.

Of course, if the surface oriented radiation characteristic is to be implemented by a mode other than the TM31 mode, the number of the first ground via holes for connection between the ground and the semicircular patches 300 may be changed.

A semi-ring patch 302 spaced apart from the semicircular patch 300 and surrounding the semicircular patch 300 is electrically connected to the bottom ground 140 through the plurality of second grounding via holes 220 and 222.

The semi-ring patches 302 are formed to surround the semicircular patches 300 to ensure higher return loss characteristics.

According to a preferred embodiment of the present invention, the points connected to the bottom ground 140 through the second ground via holes 220 and 222 in the half-ring patch 302 are spaced the same distance from the semicircular center of the semicircular patch 300 Located.

The number of ground connection points connected through the first ground via holes 210 and 212 in the semicircular patch 300 and the number of ground connection points connected through the second grounding via holes 220 and 222 in the half- The number is preferably the same.

When the surface-oriented radiation characteristic is implemented using the TM31 mode, the number of ground connection points connected through the second ground via holes 220 and 222 in the anti-ring patch 302 is two, .

When the TM31 mode is used, the second ground via holes 220 and 222 may also be located on the +45 degree line and the -45 degree line from the semicircular center of the semicircular patch 300. [

When using a mode other than the TM31 mode, the number of the second ground via-holes may also be changed.

According to a preferred embodiment of the present invention, the semi-circular patch 300 has a semi-circular patch 302 having a perfect semicircular shape and does not have a perfect semi-circular shape. Specifically, the half-ring patch 302 has a structure in which both ends are partially cut in a semicircular shape.

According to one embodiment of the present invention, when operating in the ISM band, both ends of the anti-ring patch can be cut 0.5 mm at both ends in a perfect semi-circular structure.

Referring to FIG. 4, the anti-ring patch 302 can identify a structure in which both ends of the semicircular structure are partially cut. The structure having both ends cut in such a semicircle makes it possible to have a good TM31 mode radiation pattern.

The human-wearing equipment antenna according to an embodiment of the present invention can operate in the ISM band having a center frequency of 2.45 GHz.

To operate in the ISM band with a center frequency of 2.45 GHz, the first substrate 100 may have a size of about 30.5 mm X 62 mm. Further, the thickness of the first substrate 100 and the second substrate 120 stacked is approximately equal to the thickness. And the length of the via holes connecting the bottom ground 140 and the semicircular patch 300 or the half-ring patch 302 may also be set to about 3.15 mm.

5 is a graph illustrating return loss of a human wearing antenna according to an embodiment of the present invention.

5 shows the reflection loss when the anti-ring type patch is provided and the reflection loss when the anti-ring type patch is not provided, respectively. In Fig. 5, the dotted line is the return loss when there is no anti-ring patch and the solid line is the return loss when there is a half-ring patch.

Referring to FIG. 5, it can be seen that a good return loss is secured when the anti-ring patch is provided, and it can be confirmed that radiation is performed in the ISM band with the center frequency of 2.45 GHz.

6 is a view showing a current distribution of a human wearing antenna according to an embodiment of the present invention.

Referring to FIG. 6, it can be seen that the semi-circular patch 300 and the semi-ring patch 302 formed on the upper portion have a current distribution of TM31 mode, and it is possible to have a surface directional radiation pattern by this current distribution.

FIG. 7 is a view showing a radiation pattern of an XZ plane and a YZ plane in air of a human wearing antenna according to an embodiment of the present invention, and FIG. 8 is a cross- And a radiation pattern of an XZ plane and a YZ plane in a phantom.

Referring to FIGS. 7 and 8, it can be seen that the human-wearable antenna according to the embodiment of the present invention has a surface-oriented radiation pattern due to the current distribution in the TM31 mode.

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

A first dielectric substrate;
A semicircular patch formed on the first dielectric substrate;
A semi-ring patch formed on the first dielectric substrate and spaced apart from the semicircular patch by a predetermined distance to surround the first radiation patch;
And a feed line coupled to the lower portion of the first dielectric substrate and providing a feed signal to the semicircular patch through a feed via hole,
Wherein the semicircular patch is electrically connected to ground through a plurality of first grounding via holes at a plurality of points.

The method according to claim 1,
Wherein the points electrically connected through the plurality of first ground via holes in the semicircular patch are located at the same distance from the semicircular center of the semicircular patch.

3. The method of claim 2,
Wherein the anti-ring patch is electrically connected to ground through a plurality of second grounding via holes at a plurality of points.

The method of claim 3,
Wherein the points electrically connected through the plurality of second grounding via holes in the anti-ring patch are located at the same distance from the center of the first radiation patch.

3. The method of claim 2,
Wherein the number of the first grounding via holes is two and is located on the +45 degree line and the -45 degree line from the semicircular center of the semicircular patch.

The method of claim 3,
Wherein the number of the second grounding via holes is two and is located on the +45 degree line and the -45 degree line from the semicircular center of the semicircular patch.

The method according to claim 1,
Wherein the semicircular patch has a perfect semi-circular shape, and the semi-circular patch has a structure in which both ends are partially cut in a perfect semicircle.

The method according to claim 1,
A second dielectric substrate coupled to a lower portion of the first dielectric substrate; And
And a lower ground coupled to a lower portion of the second dielectric substrate.

A first dielectric substrate;
A semicircular patch formed on the first dielectric substrate;
A semi-circular patch formed on the first dielectric substrate and spaced apart from the semi-circular patch by a predetermined distance to surround the semi-circular patch;
And a feed line coupled to the lower portion of the first dielectric substrate and providing a feed signal to the semicircular patch through a feed via hole,
A second dielectric substrate coupled to an upper portion of the feed line and coupled to a lower portion of the first dielectric substrate; And
And a lower ground coupled to a lower portion of the second dielectric substrate,
Wherein the first radiation patch is electrically connected to the lower ground via a plurality of first ground via holes at a plurality of points.

10. The method of claim 9,
Wherein the points electrically connected to the bottom ground through the plurality of first ground via holes in the semicircular patch are located at the same distance from the semicircular center of the semicircular patch.

11. The method of claim 10,
Wherein the anti-ring patch is electrically connected to the lower ground via a plurality of second grounding via holes at a plurality of points.

12. The method of claim 11,
Wherein the points electrically connected to the lower ground through the plurality of second grounding via holes in the anti-ring patch are located at the same distance from the semicircular center of the semicircular patch.

10. The method of claim 9,
Wherein the semicircular patch has a perfect semi-circular shape, and the semi-circular patch has a structure in which both ends are partially cut in a perfect semicircle.