KR102042406B1 - Relay Antenna Attached to Human Body for Human Body Communication - Google Patents

Relay Antenna Attached to Human Body for Human Body Communication Download PDF

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KR102042406B1
KR102042406B1 KR1020130159443A KR20130159443A KR102042406B1 KR 102042406 B1 KR102042406 B1 KR 102042406B1 KR 1020130159443 A KR1020130159443 A KR 1020130159443A KR 20130159443 A KR20130159443 A KR 20130159443A KR 102042406 B1 KR102042406 B1 KR 102042406B1
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South Korea
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signal
patch
ground plane
human body
band
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KR1020130159443A
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Korean (ko)
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KR20150080939A (en
Inventor
우승민
백지수
강도구
최재훈
김동탁
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한양대학교 산학협력단
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/10—Resonant antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
    • H01Q1/46—Electric supply lines or communication lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/40—Element having extended radiating surface

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Abstract

A repeater antenna for a human body attachable human communication is disclosed. The disclosed antenna includes a ground plane electromagnetically coupled to ground; A monopole radiator spaced apart from the ground plane and extending in a first direction; A first side surface spaced apart from the monopole radiator a predetermined distance, the first side surface extending in the first direction, and a second side surface spaced apart from the ground surface in a second direction, the extending direction of the adjacent ground surface A flat patch extending from the second side; And at least one inductive element electrically connecting a gap between the flat patch and the ground plane. According to the disclosed antenna, there is an advantage that can be used in the wearable relay device used for human body communication to transmit a low power level signal of the implantable device to external analysis equipment.

Description

Relay Antenna Attached to Human Body for Human Body Communication

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

With the development of wireless communication technology, ultra-small and low-power communication has become possible, and this technology has been made available for medical devices that transmit and receive internal information wirelessly through a transmitter and an external receiver in a human body.

For this reason, research of medical implantable devices for monitoring, diagnosis, and treatment with a wireless human body proximity network is being actively conducted.

Medical implantable devices must have very low output power levels due to the 25uW ERP limit of the MedRadio band. If the power level of the electromagnetic wave sent to the outside is high, it may have a detrimental effect on the patient's body, so the output level of the medical implantable device is set very low.

In addition, since the human body having a high dielectric constant and conductivity surrounds the antenna, such an environment not only changes the input impedance and resonant frequency of the antenna, but also has a problem in that the radiation efficiency is degraded and thus the reliable transmission distance is very short.

For this reason, analytical equipment needs to be very close to the human body to receive signals directly from the medical implantable device and analyze the signal from the medical implantable device. It is a problem.

Therefore, there are many problems in directly transmitting a signal from a medical implantable device to an analytical device, and a wearable relay device worn on a human body is required to solve this problem.

The wearable relay device receives a signal from a medical implantable device and transmits the signal to an external analysis device, and the antenna used for the wearable relay device has a multi-band characteristic and needs to be made compact.

The present invention proposes an antenna that can be used in a wearable relay device used for human body communication to transmit a low power level signal of an implantable device to external analysis equipment.

In addition, the present invention proposes an antenna used in a wearable relay device capable of relaying a signal of an implantable device of a first band to an external analysis device of a second band.

In addition, the present invention proposes an antenna for use in a wearable relay device that can be manufactured in a small size.

According to an aspect of the present invention to achieve the above object, a ground plane electromagnetically coupled with the ground; A monopole radiator spaced apart from the ground plane and extending in a first direction; A first side surface spaced apart from the monopole radiator a predetermined distance, the first side surface extending in the first direction, and a second side surface spaced apart from the ground surface in a second direction, the extending direction of the adjacent ground surface A flat patch extending from the second side; And at least one inductive element electrically connecting a gap between the flat patch and the ground plane.

The monopole emitter emits a signal of a first band and the flat patch emits a signal of a second band and a feed point is formed at an end of the monopole emitter.

The monopole radiator has a line shape, and the flat patch has a rectangular structure.

The monopole radiator and the first side of the plate-shaped patch are spaced apart from each other to enable coupling feeding, and coupling feeding from the monopole radiator to the plate-shaped patch is performed.

The ground plane and the second side surface of the plate-shaped patch are spaced apart by a distance capable of electromagnetic coupling, and the radiation frequency of the plate-shaped patch is adjusted according to the separation distance. \

According to another aspect of the invention, the substrate; A ground plane formed on the substrate and electromagnetically coupled to ground; A monopole radiator formed on the substrate and spaced apart from the ground by a predetermined distance and extending in a first direction; A rectangular patch having a first side adjacent to the monopole radiator and a second side adjacent to the ground plane; And at least one inductive element connecting the flat patch and the ground plane, wherein a feed point is formed at an end of the monopole radiator, the monopole radiator radiates a signal of a first band, and the flat plate type The patch is provided with a repeater antenna for a human body communication for feeding and radiating a signal of a second band from the monopole radiator by coupling feeding.

According to the antenna of the present invention, there is an advantage that can be used in the wearable relay device used for human body communication to transmit a low power level signal of the implantable device to the external analysis equipment.

1 is a view showing the structure of an antenna of a wearable relay device for human body communication according to an embodiment of the present invention;
FIG. 2 illustrates an equivalent circuit structure for a gap portion between a planar patch and a ground plane in an antenna according to an embodiment of the present invention. FIG.
3 is a graph illustrating return loss of an antenna according to an embodiment of the present invention;
4 illustrates a 3-D radiation pattern of an antenna according to an embodiment of the present invention.
5 is a diagram illustrating a MICS band zero-order resonant electric field vector of an antenna according to an embodiment of the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements.

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

1 is a view showing the structure of an antenna of a wearable relay device for human body communication according to an embodiment of the present invention.

Referring to FIG. 1, an antenna of a wearable relay device for human body communication according to an embodiment of the present invention may include a substrate 100, a ground plane 110 formed on the substrate, a monopole radiator 120, and a flat patch 130. ) May be included.

The substrate 100 functions as a body to which the components of the relay device antenna of the present invention are coupled and is made of a dielectric material. The dielectric constant of the substrate can be determined by the radiation properties required. According to one embodiment of the present invention, an FR4 substrate having a dielectric constant of 4.4 may be used.

According to one embodiment of the invention, the substrate of the antenna of the present invention may have a size of 23mm x 50mm x 1mm to operate in the MICS band and the ISM band, respectively.

The monopole emitter 120 is coupled on the substrate 100 and has a line shape. The monopole radiator 120 is formed in the same plane on the ground plane 110 and extends in one direction and is spaced apart from the ground plane 110 by a predetermined distance.

A feed point is formed at one end of the monopole emitter 120 to provide a feed signal, and the monopole emitter 120 receives a signal through direct feeding. For example, a coaxial cable may be used to feed a monopole radiator, the inner core of the coaxial cable may be coupled to the feed point, and the outer core may be coupled to the ground plane 110.

The monopole radiator 120 may have a length corresponding to one quarter of a wavelength corresponding to a use frequency. The antenna of the present invention may operate in the ISM band and the MICS band, and the monopole radiator 120 may be used to transmit and receive signals in the ISM band.

The signal of the ISM band may be used for communication with an external analysis device in a human wearable relay device, and the monopole radiator 120 functions to transmit a signal received from a medical implantable device to an external analysis device.

The shape of the monopole radiator 120 may be variously set, but it is most preferable to have a line shape of a date to provide a signal of the MICS band which will be described later.

The planar patch 130 is provided on the substrate 100 at a predetermined distance from the monopole radiator 120 and the ground plane 110 to be coupled to each other. As shown in FIG. 1, the flat patch 130 may have a rectangular shape, but is not limited thereto.

The flat patch 130 has one side parallel to the longitudinal direction of the monopole radiator 120 and is fed by the coupling method through the monopole radiator 120.

The separation distance of the monopole radiator 120 and the flat patch 130 may be determined according to the frequency of use, and the monopole radiator 120 may serve as a feeding member as well as a radiator.

According to one embodiment of the invention, the flat patch 130 is used to transmit and receive the MICS band, the flat patch 130 receives a signal from a medical implantable device inserted into the human body.

The MICS band has a center frequency of 403.5 MHz, the ISM band has a center frequency of 2.44 GHz, and the MICS band has a lower frequency band than the ISM band. Therefore, the MICS band requires a much larger radiator than the ISM band. . Therefore, in order to provide the MICS band radiator on the same substrate plane, a resonance method that can be implemented in a smaller size is required. In the present invention, the flat patch 130 is connected to the monopole radiator 120 and the ground to use zero-order resonance. The surface 110 is spaced apart from the predetermined distance.

An inductive element 150 is coupled between the planar patch 130 and the ground plane 110, and the inductance of the inductive element 150 may be determined by a radiation frequency radiated through the planar patch 130. .

In FIG. 1, one inductive element is coupled between the planar patch 130 and the ground plane 110, but the number of inductive elements may be changed as necessary to obtain a desired inductance, which will be apparent to those skilled in the art. something to do.

The gap S formed between the flat patch 130 and the ground plane 110 functions as a kind of capacitive element, and the length and the length of the gap where the flat patch 130 and the ground plane 110 are adjacent to each other. This determines the capacitance of the capacitive element.

2 is a diagram illustrating an equivalent circuit structure of a gap portion between a flat patch and a ground plane in an antenna according to an embodiment of the present invention.

Referring to FIG. 2, the inductance of the inductive element 150 connected to the gap between the flat patch 130 and the ground plane 110 may be modeled as the parallel inductance L L of the circuit shown in FIG. 2. In addition, the gap between the planar patch 130 and the ground plane 110 may be modeled with a parallel capacitance C R.

The zero-order resonant frequency radiated by the planar patch 130 is determined by the parallel capacitance C R parallel inductance L L modeled by the equivalent circuit of FIG. Can be determined.

Figure 112013116584508-pat00001

On the other hand, the antenna according to an embodiment of the present invention does not have a separate feed point for the MICS band, the signal of the ISM band and the signal of the MICS band is fed to the same feed point (F), shown in Figure 1 As such, signals in the ISM band and the MICS band are fed to one end of the monopole radiator.

When a signal in the ISM band is fed to the feed point F, the signal in the ISM band is emitted through the monopole radiator. Although signals in the ISM band are coupled to the planar patch 130, the planar patch 130 has a planar patch from the monopole radiator 120 because the parallel capacitance and the parallel inductance are determined to suit the MICS band. The signal coupled to 130 does not affect the operation of the planar patch.

On the other hand, when the signal of the MICS band is fed through the feed point (F) or when the signal of the MICS band is received by the antenna according to an embodiment of the present invention the monopole radiator 120 has a length suitable for the emission of the MICS band signal There is no radiation and reception for the MICS band in the monopole radiator.

When a signal of the MICS band is fed, coupling feeding from the monopole radiator 120 to the flat patch 130 is made, and the flat patch 130 radiates a signal of the MICS band to the outside. In addition, when a signal of the MICS band is received from the outside, the flat patch 130 receives a signal of the MICS band and is provided with a signal received at the feed point F through coupling, and the provided signal is a feed point F. And a signal processing module (not shown) connected thereto.

In order to reduce the size of the ISM band signal and the MICS band signal through the same feed point, the first side of the flattened patch is kept in the same direction as the monopole emitter while maintaining a distance that can be coupled with the monopole emitter. The second side of the flat patch extends in the same direction as the adjacent ground plane while maintaining a distance that can be coupled with the ground plane.

For example, a plate-shaped patch having a rectangular structure has a first side extending in the same direction while adjacent to the monopole radiator to receive a coupling feed, and a second side extending in the same direction adjacent to the ground plane, so that zero-order resonance is achieved. Make it happen.

By such a structure, the antenna according to the embodiment of the present invention can emit signals in the MICS band and the ISM band in a miniaturized structure on a rectangular substrate.

The size of the substrate 100 may be set to 23 mm x 50 mm so that the antenna according to an embodiment of the present invention emits signals in the ISM band and the MICS band.

Referring to the operation of the antenna according to an embodiment of the present invention having the structure as described above are as follows.

Medical implantable devices implanted inside the human body generate biometric signals and transmit biometric signals at frequencies in the MICS band. Here, the medical implantable device may include all types of implantable devices, such as a heart rate measuring device, a blood pressure measuring device, and a blood sugar measuring device.

The implantable device transmits the biometric signal using a built-in antenna, and the implantable device has a considerable limitation in size, so that the implantable device can transmit the biometric signal with a very weak signal strength.

The wearable relay device worn on the human body includes an antenna according to an embodiment of the present invention and receives a signal transmitted from an implantable device. Signals in the MICS band transmitted from the implantable device are received via the flattened patch 130. The signal received through the flat patch 130 is signal processed by the signal processing module. Here, the signal processing may include amplifying the signal, removing noise, modulating the signal, and the like.

Specifically, the signal processing module recovers the original signal through demodulation from the received signal, and removes noise from the original signal using various noise removal schemes. When the original signal is restored, amplification and modulation of the signal are performed, and modulation is performed to a signal of the ISM band.

The monopole radiator 110 of the antenna according to an embodiment of the present invention radiates the signal of the ISM band modulated by the signal processing module to the outside, and the analysis equipment located outside receives and analyzes the transmitted signal of the ISM band. do.

3 is a graph showing the return loss of the antenna according to an embodiment of the present invention.

Referring to FIG. 3, it can be seen that the 10dB return loss bandwidth is 397 to 410MHz and 2.30GHz to 2.60GHz, thus having a bandwidth satisfying the ISM band and the MICS band.

4 illustrates a 3-D radiation pattern of an antenna according to an embodiment of the present invention.

Referring to FIG. 4, the maximum gain of the body direction (−z axis direction) in the MICS band is −31 dBi and the maximum gain of the external direction (+ z axis direction) in the ISM band is about 5 dBi.

5 is a diagram illustrating a MICS band zero-order resonant electric field vector of an antenna according to an embodiment of the present invention.

Referring to FIG. 5, it can be seen that the electric field vector direction of the zeroth order resonance has the same direction in the feeding structure of the monopole radiator and the flat patch. It can be seen that the monopole radiator 110 and the flat patch 130 have the same phase apart from each other. It can be seen that it has zero-order resonance because it operates in the MICS band with an electric charge vector having the same phase at the same time.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from these descriptions. Therefore, the spirit of the present invention should not be limited to the described embodiments, and all of the equivalents or equivalents of the claims as well as the claims to be described later belong to the scope of the present invention. .

Claims (6)

A ground plane electromagnetically coupled to ground;
A monopole radiator spaced apart from the ground plane and having a line shape extending in a first direction;
A first side surface spaced apart from the monopole radiator a predetermined distance and the first side surface extended in the first direction, and a second side surface spaced apart from the ground surface a predetermined distance and extending in the second direction in an extension direction of the ground surface A flat patch having two side surfaces extending and having a rectangular structure perpendicular to the first direction and the second direction; And
At least one inductive element electrically connecting a gap between the planar patch and the ground plane,
The monopole emitter emits a signal of a first band, the flat patch emits a signal of a second band, and a feed point is formed at an end of the monopole emitter,
The monopole radiator and the first side of the plate-shaped patch are spaced apart by a distance capable of coupling feeding, the coupling feed from the monopole radiator to the plate-shaped patch is made,
And the ground plane and the second side surface of the plate-shaped patch are separated by a distance capable of electromagnetic coupling.
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KR1020130159443A 2013-12-19 2013-12-19 Relay Antenna Attached to Human Body for Human Body Communication KR102042406B1 (en)

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Publication number Priority date Publication date Assignee Title
KR20110025047A (en) * 2009-09-01 2011-03-09 중앙대학교 산학협력단 Small zeroth-order resonant antenna of simple fabrication with extended bandwidth and high efficiency
KR101417326B1 (en) * 2011-09-09 2014-07-11 한양대학교 산학협력단 Multiband Internal Antenna using Loop Structure

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