KR101975040B1 - Artificial Magnetic Conductor and Antenna Device with the same - Google Patents

Abstract

The present invention relates to an antenna apparatus using an artificial magnetic conductor. Especially, the efficiency of an antenna can be improved by using an artificial magnetic conductor having a three-dimensional structure realized in a narrow region. The antenna apparatus comprises: a radiation unit formed on at least one surface of a substrate, receiving a signal to be radiated, and radiating the received signal; a grounding unit formed on one surface of the substrate and grounding the radiation unit; and an artificial magnetic conductor formed on the other surface of the substrate and repeatedly arranged at predetermined intervals to adjust a phase of the received signal at a predetermined frequency.

Description

Technical Field [0001] The present invention relates to an artificial magnetic conductor and an antenna device using the artificial magnetic conductor.

The technical field to which the embodiments of the present invention belong is an antenna device. And more particularly to an antenna device using an artificial magnetic conductor.

A monopole antenna is a linear antenna like a dipole antenna, but one antenna is grounded instead of a conductor. The monopole antenna is used to place a conductor perpendicular to the ground and to supply a high frequency power to the bottom, which is often used for a medium wave or a short wave band. In order to implement an antenna in a small portable device such as a mobile, a small-sized antenna having high performance is required. Inverted F Antenna has been developed as an antenna for miniaturization of an antenna, and an inverted F antenna has an external matching part separately It has the advantage that the designer can control the impedance matching without need.

However, if the image current is formed in the opposite direction according to the image effect on the gain and ground, the reverse F-antenna increases the heat loss when the height approaches 0, gain is rapidly decreased. Techniques for improving the antenna efficiency by using an artificial magnetic conductor (AMC) to solve the problem that the gain of the antenna is decreased as the height of the inverted F antenna approaches the ground increases as the heat loss increases. Is being developed.

An artificial magnetic conductor is a kind of meta-material that artificially implements material properties that are not present in the natural world by using a specific structure. At the resonance frequency of the structure, the artificial magnetic conductor is a conductor whose reflection coefficient at the surface is 0 degree , Which is contrary to a general conductor whose reflection coefficient is 180 degrees in phase.

In the case of a printing type inverted F antenna, the required structure of the artificial magnetic conductor must be realized in a small space area for miniaturization. Since the conventional artificial magnetic conductor structure is designed in a wide two-dimensional plane, It is difficult to apply it to the inverted-F antenna of FIG.

Korean Patent Publication No. 10-2014-0132780 (published)

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above problems, and it is an object of the present invention to provide an antenna device having improved gain and performance of an antenna using an artificial magnetic conductor.

In particular, an antenna device improved in efficiency using an artificial magnetic conductor structure formed in a three-dimensional structure in a narrow region is disclosed.

According to an aspect of the present invention, there is provided an antenna device comprising: a radiation part formed on at least one surface of a substrate to receive a signal to be radiated and radiate the received signal; A grounding part formed on one surface of the substrate and grounding the radiating part; And an artificial magnetic conductor formed on the other surface of the substrate and repeatedly arranged at predetermined intervals to adjust the phase of the fed signal at a preset frequency; .

In the present invention, the antenna device may further include a feeding part electrically connecting the radiating part and the grounding part to each other; And the radiating part can receive the signal to be radiated through the power feeding part.

In the present invention, the radiation part and the ground part are formed by etching a conductor coated in advance on at least one surface of the substrate, and the predetermined frequency may be provided at a resonance frequency according to the electrical property of the artificial magnetic conductor.

In the present invention, the ground portion may be formed of a conductor on the same surface as the radiation portion of the substrate, and may be electrically connected to at least one radiation element included in the feed portion and the radiation portion, and may be grounded.

In the present invention, the artificial magnetic conductor is disposed at a predetermined distance from the other surface of the substrate. And vias electrically connecting the capacitive element and the ground; And the phase of the signal can be adjusted using the capacitive element and the via.

In the present invention, the artificial magnetic conductor is formed on both sides of the electrostatic capacitive element and has a connection part electrically connecting the capacitive element and the via. And the phase of the signal can be adjusted using the capacitive element, the via, and the connection.

In the present invention, the artificial magnetic conductor is fixed to the substrate through a via hole connected to the ground through the substrate and disposed at the edge of the ground adjacent to the radiation, The phase can be adjusted.

In the present invention, the radiating portion may include a first arm having one end connected to the feeding portion, a second arm extending from the other end of the first arm to both sides of the first arm, and an end connected to the first arm of the second arm And a third arm extending from the opposite end of the first arm and extending from the first arm and spaced apart from the first arm by a predetermined distance, wherein the first arm, the second arm, have.

In the present invention, the second arm is horizontally opposed to the ground portion, the end portions connected to the first arm and the third arm have different widths, and the second arm extends to both sides of the first arm, 3 arm. ≪ / RTI >

In the present invention, the via may be structurally coupled to the inside of the via hole to electrically connect the capacitive element and the ground.

In the present invention, the vias may be electrically connected to the ground portion through the substrate from each of the connection portions.

In the present invention, the capacitive element, the connection portion and the via are connected to one closed loop, and the artificial magnetic conductor can adjust the phase of the fed signal using the closed loop.

In the present invention, the signal radiated from the radiation unit includes a current signal, and the frequency of the radiated signal may be the same as the resonance frequency.

In the present invention, the artificial magnetic conductor can adjust the phase of the current signal flowing at least at least a part of the radiating part and at least a part of the edge of the grounding part adjacent to the radiating part at the resonance frequency.

According to another aspect of the present invention, there is provided an artificial magnetic conductor comprising: a capacitor having a three-dimensional structure disposed at a predetermined interval and formed on at least one surface of a substrate and disposed at a preset distance; A connection part formed on both sides of the capacitor and electrically connected to the capacitor; A grounding portion formed on the other surface of the substrate with a conductor; And vias connected from the connection portions formed on both sides of the capacitor to the ground portion; . ≪ / RTI >

In the present invention, the ground unit and the capacitor are formed on different surfaces of the substrate, and the via may be connected to the connection unit and the ground unit vertically.

In the present invention, at least one via connected from each of the connection portions to the ground portion may be connected to the conductive strip line at the ground portion.

In the present invention, the capacitor, the connection portion, the via formed on both sides of the connection portion and connected to the ground portion, and the strip line formed by the via connected to the ground portion may be electrically connected as one closed circuit to form the three-dimensional structure .

In the present invention, the resonance frequency of the closed circuit is determined by a capacitance of the capacitor, an inductance according to a length of the via, a distance between vias connected to the ground from both sides of the connection part included in the one closed circuit, Can be set considering the distance between vias.

According to another aspect of the present invention, there is provided an antenna device including: a substrate; A radiation unit formed on at least one surface of the substrate to emit a signal to be radiated and to radiate the supplied signal; A capacitor formed on both sides of the capacitor and electrically connected to the capacitor, and a connection part formed on both sides of the capacitor, the capacitor being formed on the other surface of the substrate, An artificial magnetic conductor in which one closed circuit including vias connected to the ground is repeatedly arranged; . ≪ / RTI >

According to the present invention, the gain and performance of an antenna can be improved by using an artificial magnetic conductor.

Particularly, the efficiency of the antenna can be improved by using the artificial magnetic conductor having a three-dimensional structure realized in a narrow region.

1 is an exemplary view showing an antenna device using an artificial magnetic conductor according to an embodiment of the present invention.
FIG. 2 is an exemplary view showing a detailed specification of an inverted-F antenna in the embodiment of FIG. 1 of FIG. 2. FIG.
3 is an exemplary diagram showing a parallel dipole for explaining antenna gain reduction according to heat loss.
4 is a chart showing the loss due to the ground when the height of the horizontal dipole is changed.
5 is a chart showing the amount of change in gain with respect to the height of a dipole in a dipole antenna operating at 2.4 GHz.
6 is an exemplary view showing a conventional artificial magnetic conductor structure designed in a plane.
7 is an exemplary view showing another surface of an antenna device using an artificial magnetic conductor in the embodiment of FIG.
8 is an exemplary view showing a detailed configuration and an equivalent circuit of the artificial magnetic conductor according to an embodiment of the present invention.
9 is an exemplary view showing a specification of a detailed configuration of an artificial magnetic conductor according to an embodiment of the present invention.
10 is an exemplary view showing a current density flow in an antenna device using an artificial magnetic conductor according to an embodiment of the present invention.
11 is an exemplary diagram illustrating the phase at which the artificial magnetic conductor reflects at a frequency near 2.4 GHz according to an embodiment of the present invention.
FIG. 12 is an exemplary diagram illustrating gain of an antenna device using an artificial magnetic conductor according to an embodiment of the present invention at a frequency near 2.4 GHz.

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

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description with reference to the accompanying drawings, the same or corresponding components are denoted by the same reference numerals, and a duplicate description thereof will be omitted.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope. The singular expressions include plural expressions unless the context clearly dictates otherwise. Each of the steps described below may be implemented by one or a plurality of software modules, or hardware that is responsible for each function, or a combination of software and hardware. Specific meanings and examples of the terms will be described below in accordance with the order of each drawing. Hereinafter, the configuration of an antenna device 10 according to an embodiment of the present invention will be described in detail with reference to related related drawings.

1 is an exemplary view showing one surface of an antenna device 10 according to an embodiment of the present invention.

The antenna device 10 of the present invention includes a radiation part 100, a feed part 200, a substrate 300, a ground part 400 and an artificial magnetic conductor 500. For example, the antenna device 10 may include an artificial magnetic conductor 500 in at least a portion of the substrate 300 to control the gain and performance of the antenna device 10 by adjusting the phase of the current density flowing through the antenna device 10. [ Can be improved. The antenna device 10 may receive a signal to be radiated from the feeder 200 and emit a fed signal. The antenna device 10 of the present invention may transmit and receive information to be transmitted through the radiated signal . The signal used by the antenna device 10 of the present invention includes an electromagnetic wave signal and a current signal having a preset frequency, and the frequency of the signal may be the same as the resonance frequency.

The antenna device 10 of the present invention has been proposed in order to solve the problem of miniaturization of the artificial magnetic conductor in a printing type inverted F antenna and includes a reverse F antenna using a miniaturized artificial magnetic conductor . Will be described with reference to FIG.

The radiation unit 100 is formed on at least one surface of the substrate 300, receives a signal to be radiated from the power feeding unit 200, and radiates the supplied signal. In the present invention, the power feeder 200 may not be implemented separately but may be included in the radiation unit 100. In this case, the radiation unit 100 may feed a signal to be radiated from the power feeder 200, Can receive. The radiation unit 100 of the present invention may be implemented with an inverted F-type antenna structure including at least one radiator or radiating element.

For example, the radiation section 100 may include a radiator structure in the form of an inverted FEF antenna, and may be formed by etching the conductor previously coated on both sides of the substrate 300. The radiation unit 100 includes a first arm 120 having one end connected to the feed unit 200 and a second arm 120 extending from the other end of the first arm 120 to both sides of the first arm 120. [ (140) and a third arm (160) that is bent at an end opposite to an end of the second arm (140) connected to the first arm (120) and is spaced apart from the first arm (120) And may radiate the fed signal through the first arm 120, the second arm 140, and the third arm 160. [

For example, the second arm 140 included in the radiation unit 100 of the present invention is horizontally opposed to the ground unit 400, and is connected to the first arm 120 and the third arm 160 And may extend to both sides of the first arm 120 and may extend longer to the opposite side of the third arm 160. In this case, Preferably, the width 122 of the first arm 120 is 0.5 mm, the width 142 of the second arm 140 is 1 mm, the width 164 of the third arm 160 is 0.2 mm, The distance 162 between the second arm 120 and the third arm 160 is 0.4 mm and the length 144 excluding the end where the first arm 120 and the third arm 160 are connected in the second arm 140 is 15 mm The total height 102 of the radiation part 100 is 2 mm and the distance 104 between the radiation part 100 and the ground part 400 is 1 mm. Preferably, the etching thickness of the radiation part 100 of the present invention may be 0.035 mm.

The power feeder 200 may electrically connect the grounding unit 400 and the radiation unit 100 and may supply a signal to be radiated by the radiation unit 100 to the radiation unit 100. For example, the feeding part 200 may be formed on at least a part of the substrate 300, and may be positioned between the radiation part 100 and the ground part 400 to perform a feeding function to the radiation part 100. The power feeder 200 is a transmission line for transmitting the energy of a signal to be radiated to the radiation unit 100 and supplies energy of a signal to be radiated by the radiation unit 100 to the radiation unit 100, And converts the received signal into a current and transmits the current to the receiver.

The substrate 300 includes a conductor on at least one surface thereof to form a region where the radiation portion 100, the feed portion 200, the ground portion 400 and the artificial magnetic conductor 500 are fixed. At least a portion of the via hole Via holes may be formed to fix the artificial magnetic conductor 500 in the substrate 300. For example, the substrate 300 may include a conductor previously coated on both sides, and the radiation portion 100 and the ground portion 400 may be formed by etching the previously coated conductor. The substrate 300 may be provided as a FR-4 and may have a thickness of 1.5 mm, a width of 50 mm, and a length of 50 mm, and may be provided with a dielectric having a predetermined permittivity.

The ground unit 400 is formed on at least one surface of the substrate to ground the radiation unit 100.

The grounding part 400 is formed on at least one surface of the substrate but is preferably formed on the same surface as the radiation part 100 and electrically connected to at least one radiation element and the feeding part 200 included in the radiation part 100 So that the radiation part 100 and the feeding part 200 can be grounded. The grounding unit 400 may be formed on the same surface as the radiation unit 100 and ground the other end of the via connected to the capacitive element 520 formed on the other surface of the substrate 300 to form a strip line .

For example, the grounding unit 400 can ground the artificial magnetic conductor 500 formed on the other surface of the substrate 300 on the other surface of the substrate 300, on the other surface of the substrate 300 on which the artificial magnetic conductor is formed have. The grounding part 400 of the present invention may be formed of copper and the etching thickness of the grounding part 400 may be the same as that of the radiation part 100. The artificial magnetic conductor 500 formed on at least a part of the ground part 400 at the time of observing the antenna device 10 in the ground part 400 provided on the same plane as the radiation part 100 is not visually confirmed , Only the section of the via connecting the artificial magnetic conductor 500 can be observed.

The antenna device 10 according to another embodiment of the present invention includes a substrate 300, a radiation part 100 formed on at least one surface of the substrate 300 and fed with a signal to be radiated and radiating the supplied signal, A grounding part 400 formed on one surface of the substrate and a capacitor 520 formed on the other surface of the substrate 300 at predetermined intervals; a connection part 522 formed on both sides of the capacitor and electrically connected to the capacitor, 524 that are connected to the ground portion 400 and the vias 526, 528 that are connected to the ground portion 400 at each of the connection portions 522, 524 formed on both sides of the capacitor . Will be described with reference to FIG.

The antenna device 10 of the present invention may include an artificial magnetic conductor to solve the gain reduction of the antenna due to the heat loss caused by the video effect of the ground. For example, if the dipole 602 at the origin is located at the height h, if the image dipole 604 exists at a lower height h from the origin and the height of the antenna is lower, The image current (image current) due to the heat loss is reversed, and the antenna gain (gain) corresponding to the heat loss can be reduced. Will be described with reference to FIG.

When the height of the horizontal dipole decreases, the antenna gain decreases and the ground loss increases. In order to implement an antenna in a small electronic device, the antenna also needs to be miniaturized, and the shorter the height of the antenna, the more advantageous it is. In order to miniaturize the antenna, it is often required to reduce the height h of the antenna. However, in this case, the gain of the antenna is reduced. In order to solve the problem of reduction in antenna gain due to antenna miniaturization, an antenna device using an artificial magnetic conductor designed in a planar shape has been developed. However, it has been described above that it is difficult to apply to a planar inverted F antenna. Will be described with reference to Figs. 5 and 6. Fig.

 When the height of the antenna device 10 of the present invention is small, the gain of the antenna device 10 decreases and the gain of the antenna increases as the height increases. Therefore, it is required to develop an antenna device capable of realizing low gain while obtaining a high gain. A conventional antenna device using an artificial magnetic conductor includes a single plane waveguide (CPW), a parasitic patch 628, and a circular waveguide 628 on an artificial magnetic conductor 624 cell designed in a planar shape on at least one side of a substrate 620 And an antenna unit including a ground unit 622 on the other surface of the substrate 620. [ However, when the conventional artificial magnetic conductor structure is used, it is difficult to apply to a flat-printing type reverse-F antenna because it is designed in a wide plane. In the case of a printing type inverted F antenna, the required structure of the artificial magnetic conductor must be realized in a small space area for miniaturization. Since the conventional artificial magnetic conductor structure is designed in a wide two-dimensional plane, It is difficult to apply it to the inverted-F antenna of FIG. Will be described with reference to Figs. 7 and 8. Fig.

The artificial magnetic conductor 500 is formed on at least one surface of the substrate 300 and adjusts the phase of the signal of the radiation part 100 fed from the feed part 200 at a preset frequency. For example, the artificial magnetic conductor 500 can control the phase of a signal fed at a resonant frequency according to the electrical properties of the artificial magnetic conductor. The artificial magnetic conductor (500, Artificial Magnetic Conductor) has a characteristic that the phase of the reflection coefficient of the surface is zero near the resonance frequency of the structure, and is opposite to that of a general conductor having a reflection coefficient of 180 degrees. same. The antenna device 10 of the present invention includes the artificial magnetic conductor 500 on at least one side of the substrate and preferably the artificial magnetic conductor 500 is connected to the radiation part 100 and the ground part 400, And the grounding part 100 grounds the artificial magnetic conductor 500 via the via so that the direction of the image current signal flowing through the grounding part 400 is changed from the current flowing in the radiation part 100 And the ground loss due to the ground effect can be reduced.

For example, the artificial magnetic conductor 500 is formed on the other surface of the substrate 300 on which the radiation portion 100 is formed, and includes the electrostatic capacitive element 520 and the electrostatic capacitive element 520 disposed apart from each other by a predetermined distance. 520 of the radiation unit 100 and the vias 526 and 528 for electrically connecting the ground unit 400 to the signal unit 520 using the capacitive element 520 and the vias 526 and 528, Can be adjusted. The artificial magnetic conductor 500 includes connecting portions 522 and 524 formed on both sides of the electrostatic capacitive element 520 and electrically connecting the capacitive element 520 and the vias 526 and 528, And the phase of the signal can be adjusted using the capacitive element 520, the vias 526 and 528, and the connection portions 522 and 524. The capacitive element 520 of the present invention may be provided as a capacitor, and may be provided with an element having a capacitance of preferably 2 pF.

The artificial magnetic conductor 500 of the present invention is formed on the other surface of the substrate 300 formed by etching the radiation part 100 and the artificial magnetic conductor 500 is formed on one surface of the substrate on which the radiation part 100 and the ground part 400 are formed 500 may not be observed or only the section connected to the ground 400 of the vias 526, 528 for connecting the capacitive element 520 to the ground 400 may be observed. That is, the antenna device 10 of the present invention has a structure in which the first arm 120, the second arm 140, and the third arm 160 of the radiation unit 100 are covered with a grounding portion 400 is observed and the artificial magnetic conductor 500 including the capacitive element 520 and the connection portions 522 and 524 is visually confirmed on the other surface of the substrate on which the radiation portion 100 and the ground portion 400 are formed May be possible.

For example, the artificial magnetic conductor 500 is provided on the substrate 300 to structurally fasten the vias 526 and 528 in the via hole connected to the grounding part 400 through the substrate 300, ). The artificial magnetic conductor 500 can electrically connect the capacitive element 520 to the ground portion 400 formed on one surface of the substrate 300 through the vias 526 and 528 structurally coupled to the inside of the via hole have. The vias 526 and 528 included in the artificial magnetic conductor 500 may be connected to the connection portions 522 and 524 and may be electrically connected to the grounding portion 400 through the substrate 300. [

In the present invention, the artificial magnetic conductor 500 may mean a single artificial magnetic conductor or a set of artificial magnetic conductors when a plurality of artificial magnetic conductors are repeatedly arranged. For example, the capacitive element 520, the connections 522 and 524 and the vias 526 and 528 included in one artificial magnetic conductor 500 are connected in a closed loop, and the artificial magnetic conductor 500 Can adjust the phase of the fed signal of the radiation unit 100 by using the connected closed loop. The electrostatic capacitive element 520 connected to one closed circuit and the connection portions 522 and 524 and the vias 526 and 528 are connected to the substrate 300 to form the artificial magnetic conductor 500 formed by repeatedly arranging the three- The phase of the current signal flowing in at least part of the radiation part 100 and at least part of the edge of the ground part 400 adjacent to the radiation part 100 at the resonance frequency can be controlled equally. The antenna gain and efficiency that can be improved when the antenna device 10 of the present invention uses the artificial magnetic conductor 500 is as follows.

When the antenna device 10 does not use an artificial magnetic conductor (AMC) (WithOut, W / O), the gain is 0.88 dB, the efficiency is 59.9%, and an artificial magnetic conductor (AMC) It is observed that the gain is improved by 0.78Db and the efficiency is improved to 10.5% by 1.6Db and 70.4% by efficiency, respectively.

FIG. 2 is an exemplary view showing a detailed specification of an inverted-F antenna in the embodiment of FIG. 1 of FIG. 2. FIG.

The radiation unit 100 is formed on at least one surface of the substrate 300, receives a signal to be radiated from the power feeding unit 200, and radiates the supplied signal. The radiation unit 100 includes a first arm 120, a second arm 140 and a third arm 160 as at least one radiation element and includes a first arm 120, a second arm 140, And the third arm 160 is used to emit a fed signal. In the present invention, the radiation unit 100 may be implemented as an inverted F-type antenna with one side grounded, and detailed specifications of the plurality of radiation members included in the radiation unit 100 are as described above.

3 is an exemplary diagram showing a parallel dipole for explaining antenna gain reduction according to heat loss.

A dipole 602 formed at a height h from an origin corresponds to an arbitrary current density flowing in the radiation portion 100. The dipole 602 has a height And the dipole 604 formed at the height h from the origin to the dipole 604 may correspond to any current density flowing at the edge of the ground portion 400 adjacent to the radiation portion 100. The antenna device 10 can improve the gain of the antenna by adjusting the phase of the image current flowing in at least a part of the grounding part 400 to be equal to the current signal of the radiation part 100.

4 is a chart showing the loss due to the ground when the height of the horizontal dipole is changed.

로 마련될 수 있다.As the antenna height decreases, the ground loss (606) increases and the gain (608) of the antenna decreases. Here, the antenna height h is a wavelength of a signal radiated from the antenna, and in the case of the present invention, 1 mm = 0.008

.

5 is a chart showing the amount of change in gain with respect to the height of a dipole in a dipole antenna operating at 2.4 GHz.

인 경우 안테나 최대 이득을 가지고, 0.15

에서 0.35

까지는 Horizontal Dipole 높이 증가에 따른 안테나 이득이 감소되는 경향을 나타낸다. 안테나 장치(10)는 0.15

전까지는 Horizontal Dipole 높이가 감소할수록 그라운드 손실이 증가하고, 그에 따른 안테나 이득이 감소함은 전술한 바와 같다.As described above, the antenna gain of the antenna device 10 of the present invention has a maximum antenna gain at a resonance frequency of 2.4 GHz and an antenna gain (dB) decreases as the height of the antenna decreases. For example, the antenna device 10 has a Horizontal Dipole height of 0.15

0.0 > 0.15 < / RTI >

To 0.35

Shows that the antenna gain tends to decrease with increasing height of the horizontal dipole. The antenna device 10 has a thickness of 0.15

The ground loss increases as the height of the horizontal dipole decreases, and the antenna gain decreases accordingly.

6 is an exemplary view showing a conventional artificial magnetic conductor structure designed in a plane.

An antenna device using a conventional artificial magnetic conductor includes an artificial magnetic conductor cell 624 designed in a planar shape on at least one side of a substrate 620, a single plane waveguide (CPW) 626 on an artificial magnetic conductor cell 624, A parasitic patch 628, and a feeder 630. The parasitic patch 628 includes a parasitic patch 628, The limitations due to the planar artificial magnetic conductor structure used by conventional artificial magnetic conductors are as described above and thus are omitted.

7 is an exemplary view showing another surface of an antenna device using an artificial magnetic conductor in the embodiment of FIG.

The antenna device 10 using the artificial magnetic conductor may be configured such that only the ground portion 400 formed of a conductor is observed on one surface of the substrate 300 formed by etching the radiation portion 100, Only the cross-section of the vias 526 and 528 for electrical connection to the electrodes 400 and 400 is observed. When observing the antenna device 10 from the other surface of the substrate 300 on which the radiation unit 100 is formed, the electrostatic capacitive element 520 and the connection portions 522 and 524 formed in at least a part of the substrate 300 are observed . The present invention is not limited to the number of artificial magnetic conductors 500 formed in a part of the ground portion 400 and the substrate 300 where the artificial magnetic conductor 500 is formed, , And the antenna characteristics of the antenna device 10. In the present invention, the connection portions 522 and 524 may be formed of a conductor such as copper for electrically connecting the capacitive element 520.

The artificial magnetic conductor 500 of the present invention has a structure in which a three-dimensional structure including a capacitive element 520, connection portions 522 and 524 and vias 526 and 528 penetrates the substrate to form the radiation portion 100, At a predetermined interval on the edge of the ground unit 400 adjacent to the ground. As described above, the capacitive element 520 may be preferably provided with a capacitor having a capacitance of 2 pF.

For example, the artificial magnetic conductor 500 is formed on both sides of the capacitor 520, which is formed on the other surface of the substrate on which the radiation unit 100 and the ground unit 400 are formed, 522 and 524 electrically connected to the capacitor 520 and vias 526 and 528 formed through the substrate 300 at the connection portions 522 and 524 and connected to the ground portion 400, . The predetermined interval at which the artificial magnetic conductor 500 of the present invention is repeatedly arranged at the grounding part 400 may be set to 0.1 mm.

The capacitor 520 included in the artificial magnetic conductor 500 according to one embodiment is formed on the other surface of the substrate 300 on which the radiation portion 100 and the grounding portion 400 are formed and the vias 526 and 528 And may be vertically connected to the connection portions 522 and 524 so as to be in electrical contact with the ground portion 400. [ For example, the vias 526 and 528 included in the artificial magnetic conductor 500 disposed at predetermined intervals may be connected to the conductive strip line at the ground portion 400. [

8 is an exemplary view showing a detailed configuration and an equivalent circuit of the artificial magnetic conductor according to an embodiment of the present invention.

The artificial magnetic conductor 500 of the present invention may be implemented as an equivalent electrical circuit to exhibit the same electrical properties as the capacitive element 520 is the capacitor 540 and the vias 526 and 528 have an inductance of L / The inductors 546 and 548 and the strip line formed between the vias 526 and 528 connected to the ground unit 400 are connected to the inductor 554 having the inductance of Lg1 and the inductor between the inductors not included in one closed circuit 400 may be provided with inductors 550, 552 having an inductance of Lg2. The equivalent circuit of the present invention may be further simplified by providing a capacitor 540 having C capacitance, an inductor 556 having an L inductance and an inductor 558 having an inductance Lg1 * Lg2 / (Lg1 + Lg2) .

Includes the capacitive element 520 included in the artificial magnetic conductor 500, the connections 522 and 524 and the vias 526 and 528. For example, the artificial magnetic conductor 500 may include a strip line between the vias connected to the capacitive element 520, the connections 522 and 524, the vias 526 and 528 and the ground 400 as one closed loop And it can be formed in a three-dimensional structure on the substrate 300 as described above.

9 is an exemplary view showing a specification of a detailed configuration of an artificial magnetic conductor according to an embodiment of the present invention.

The transverse length of the electrostatic capacitive element 520 included in the artificial magnetic conductor 500 according to an embodiment may be 0.5 mm and the connection portions 522 and 524 may be 0.75 mm wide and 0.5 mm long. And 528 are cylindrical conductors, and the length of the radius of the cylindrical section is 0.2 mm, and the total height of the vias 526 and 528 is 1.5 mm. The resonant frequency of the artificial magnetic conductor included in one closed circuit among the artificial magnetic conductors 500 repeatedly arranged at predetermined intervals according to the present invention can be designed by the following equation.

C is the capacitance of the capacitor 520 as a capacitive element, L is the inductance component of the via and the connecting portion, Lg1 is the impedance of the strip line formed between the vias 526 and 528, fr is the resonant frequency of the artificial magnetic conductor 500, And Lg2 denotes the inductance of the ground portion 400 formed between the vias included in the different closed circuits. In the present invention, when the capacitance of the capacitive element 520 is increased, the resonance frequency is lowered. When the length of the via is increased, the resonance frequency is lowered because L is increased. When the distance between the vias 526 and 528 is increased, The resonance frequency is lowered because the resonance frequency is lowered and the distance between one closed loop is further increased. Accordingly, the artificial magnetic conductor 500 of the present invention has inductance according to the capacitance of the capacitor, the length of the via, and the thickness of the connection portion connected to the via, and the inductance of the connection portion 522, 524 included in the one closed circuit, The resonance frequency can be set in consideration of the distance between the vias 526 and 529 connected to the adjacent openings and the distance between adjacent vias included in the closed circuits.

10 is an exemplary diagram showing the flow of current density in the antenna device 10 according to an embodiment of the present invention.

The antenna device 10 uses the artificial magnetic conductor 500 included in the other surface of the substrate 300 on which the radiation unit 100 and the ground unit 400 are formed, And the phase of the power fed to the edge of the ground unit 400 adjacent to the radiation unit 100 can be controlled to be the same. For example, the antenna device 10 can adjust the phase of the fed signal equally to improve the gain and performance of the antenna by adjusting the direction of the image current (Image Cuurent) according to the video effect of the ground to 0 degrees. The current density signal 702 flowing from the antenna device 10 to the second arm 160 is directed to the right and is transmitted from the edge of the ground portion 400 adjacent to the second arm 160 to the artificial magnetic conductor 500, The direction of the current density signal 704 flowing in the region is also directed to the right, and it can be observed that the phases of the signals are the same. The antenna device 10 has a structure in which the phase of the current density flowing in at least a part of the edges of the ground portion 400 adjacent to the radiation portion 100 and the radiation portion 100 is set to be the same as that of the capacitive element 520, The heat loss can be reduced by controlling the same by using the artificial magnetic conductor including the connection portions 522 and 524 and the vias 526 and 528. [

11 is an exemplary diagram illustrating the phase at which the artificial magnetic conductor reflects at a frequency near 2.4 GHz according to an embodiment of the present invention.

The antenna device 10 can adjust the phase of the reflection coefficient reflected from the surface to be 0 degree 802 near the resonance frequency (2.4 GHz, 802) of predetermined frequency by using the artificial magnetic conductor 500. For example, the antenna apparatus 10 has a reflection coefficient of 170 degrees at 2.2 Ghz, but the operating frequency gradually increases, so that the reflection coefficient has a phase of 0 degrees near 2.4 Ghz, and a phase of reflection coefficient May be set at about -180 degrees.

Since the phase of the reflection coefficient on the surface of the artificial magnetic conductor 500 used by the antenna device 10 is 0 degree, unlike the case where the phase of the reflection coefficient is 180 degrees on the surface of a general conductor, It is possible to control the phases of signals flowing in at least a part of the radiation part 100 and the ground part 400 using the conductor as described above.

FIG. 12 is an exemplary diagram illustrating gain of an antenna device using an artificial magnetic conductor according to an embodiment of the present invention at a frequency near 2.4 GHz.

The antenna device 10 of the present invention can design the resonance frequency using Equation (1) and operate at the maximum gain at the designed resonance frequency. For example, when the S parameter chart of the antenna apparatus 10 is observed, it can be observed that the value of S11, which is the input reflection coefficient, represents -24 dB, which is the lowest at the resonance frequency 804. Accordingly, the antenna apparatus 10 can be provided such that the reflection ratio of the power of the signal input at 2.4 GHz is the lowest and the maximum signal power is radiated to the outside.

All or part of the method of an embodiment of the invention described above can be implemented in the form of a computer-executable recording medium such as a program module executed by a computer. Here, the computer-readable medium can be any available medium which can be accessed by a computer, and includes both volatile and nonvolatile media, removable and non-removable media. The computer-readable medium may also include computer storage media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data.

All or part of the method according to an embodiment of the present invention may also be embodied in a computer program (or computer program product) recorded on a medium, including instructions executable by the computer. A computer program includes programmable machine instructions that are processed by a processor and can be implemented in a high-level programming language, an object-oriented programming language, an assembly language, or a machine language . The computer program may also be recorded on a computer readable recording medium of a type (e.g., memory, hard disk, magnetic / optical medium or solid-state drive).

Thus, a method according to an embodiment of the present invention may be implemented by a computer program as described above being executed by a computing device. The computing device may include a processor, a memory, a storage device, a high-speed interface connected to the memory and a high-speed expansion port, and a low-speed interface connected to the low-speed bus and the storage device. Each of these components is connected to each other using a variety of buses and can be mounted on a common motherboard or mounted in any other suitable manner.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (20)

In an inverted F-type antenna apparatus,
A radiation unit formed on at least one surface of the substrate to emit a signal to be radiated and to radiate the received signal;
A grounding part formed on one surface of the substrate and grounding the radiating part; And
An artificial magnetic conductor formed on the other surface of the substrate and repeatedly arranged at predetermined intervals to adjust the phase of the fed signal at a predetermined frequency; / RTI >
Wherein the artificial magnetic conductor comprises: a capacitive element disposed at a predetermined distance from the other surface of the substrate; a via electrically connecting the capacitive element and the ground unit; And a connection portion for electrically connecting the capacitive element and the via,
Wherein the capacitive element, the connection and the via are connected by a closed loop, the artificial magnetic conductor regulates the phase of the fed signal using the closed loop,
Wherein the resonance frequency of the closed circuit is set in consideration of a distance between adjacent vias included in different closed circuits. The method according to claim 1,
A power feeder for electrically connecting the radiating part and the grounding part; Further comprising:
And the radiating part receives the signal to be radiated through the feeding part. The method according to claim 1,
Wherein the radiation part and the ground part are formed by etching a conductor coated in advance on at least one surface of the substrate,
Wherein the predetermined frequency is provided at a resonance frequency according to an electrical property of the artificial magnetic conductor. 3. The apparatus of claim 2, wherein the ground
The radiation plate being formed on the same surface of the radiation plate as the radiator,
Wherein the antenna unit is electrically connected to at least one radiating member included in the feeding part and the radiating part, and is grounded. delete delete The method of claim 2, wherein the artificial magnetic conductor
Wherein the substrate is fixed to the substrate through a via hole formed in the substrate and connected to the ground through the substrate,
Wherein the antenna unit is disposed at an edge of the ground unit adjacent to the radiation unit to adjust the phase of the fed signal. 3. An apparatus according to claim 2,
A second arm extending from the other end of the first arm to both sides of the first arm and a second arm extending from the other end of the first arm to an end of the second arm opposite to the end connected to the first arm, And a third arm formed at a predetermined distance from the first arm,
And radiates the supplied signal through the first arm, the second arm, and the third arm. 9. The apparatus of claim 8, wherein the second arm
The first arm and the third arm being formed to have a width different from that of the first arm and being connected to the first arm and the third arm and being extended to both sides of the first arm, Wherein the antenna device comprises: 8. The method of claim 7,
And electrically connecting the capacitive element and the ground unit by being structurally connected to the inside of the via hole. 3. The method of claim 2,
And the antenna unit is electrically connected to the ground unit through the substrate from each of the connection units. delete The method of claim 3,
Wherein the signal radiated from the radiation section includes a current signal, and the frequency of the radiated signal is equal to the resonance frequency. 14. The method of claim 13, wherein the artificial magnetic conductor
And adjusts the phase of the current signal flowing in at least a part of the radiating part and at least a part of the edge of the grounding part adjacent to the radiating part at the resonance frequency equally. delete delete delete delete delete The method according to claim 1,
And a substrate formed on one surface of the radiating portion.

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