KR20170095541A - Complex antenna and mobile personal terminal having the same - Google Patents

Complex antenna and mobile personal terminal having the same Download PDF

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Publication number
KR20170095541A
KR20170095541A KR1020160017057A KR20160017057A KR20170095541A KR 20170095541 A KR20170095541 A KR 20170095541A KR 1020160017057 A KR1020160017057 A KR 1020160017057A KR 20160017057 A KR20160017057 A KR 20160017057A KR 20170095541 A KR20170095541 A KR 20170095541A
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KR
South Korea
Prior art keywords
loop
terminal
resin film
antenna
electrically connected
Prior art date
Application number
KR1020160017057A
Other languages
Korean (ko)
Other versions
KR101794166B1 (en
Inventor
김성열
최재원
신중권
박찬진
Original Assignee
주식회사 알에프텍
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Priority to KR1020160017057A priority Critical patent/KR101794166B1/en
Publication of KR20170095541A publication Critical patent/KR20170095541A/en
Application granted granted Critical
Publication of KR101794166B1 publication Critical patent/KR101794166B1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in 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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0277—Details of the structure or mounting of specific components for a printed circuit board assembly

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)

Abstract

There is provided an antenna capable of increasing radiation efficiency by reducing a resistance of a coil while maintaining an inductance value, and a personal portable terminal including the antenna. These antennas are antennas for transmitting and receiving signals of a certain frequency band, and include a first loop and a second loop. The first loop is started from the first terminal and is wound toward the second terminal. The second loop is wound toward a fourth terminal, which is started from a third terminal electrically connected to the first terminal and electrically connected to the second terminal, and is wound in the same direction as the first loop.

Description

TECHNICAL FIELD [0001] The present invention relates to an antenna and a portable terminal including the antenna.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna and a personal portable terminal including the same, and more particularly, to a coil type antenna and a portable personal terminal including the same.

The spread of personal mobile devices such as smart phones has brought a lot of convenience to users. In addition to basic functions such as call and text transmission, it is possible to provide not only Internet access but also location based service including GPS chip.

Various functions are being integrated into such personal portable terminals. For example, when a credit card information is registered in a smartphone and the smartphone is used instead of a credit card, when the smartphone is used in a credit card payment terminal, the smartphone transmits the credit card payment information to the payment terminal, Payment services are also being added.

For this mobile payment service, a Magnetic Secure Transmission (MST) chip has been developed and installed in a personal portable terminal, and a separate magnetic security transmission antenna is provided for this purpose.

Such a magnetic security transmission antenna is a coil shape and is formed as a spiral coil in a resin film.

However, in the conventional magnetic security transmission antenna, a sufficient number of rotations of the coil is required to have a sufficient inductance (L) value. However, when the number of rotations is increased as described above, the length of the wire becomes longer and the resistance value increases. .

Furthermore, when the housing of the portable personal terminal is made of metal, or a case where a metal plate is attached to the housing, the antenna may be used as an antenna for other purposes. In the case of the conventional magnetic security transmission antenna, The value is decreased and the resistance value is increased, which causes a problem that the radiation efficiency is further deteriorated.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an antenna capable of increasing radiation efficiency by reducing a resistance of a coil while maintaining an inductance value, and a portable personal terminal including the same.

To solve these problems, an antenna according to an exemplary embodiment of the present invention is an antenna for transmitting and receiving a signal of a certain frequency band, and includes a first loop and a second loop. The first loop is started from the first terminal and is wound toward the second terminal. The second loop is wound toward a fourth terminal, which is started from a third terminal electrically connected to the first terminal and electrically connected to the second terminal, and is wound in the same direction as the first loop.

For example, the first loop and the second loop may be formed on the first side of the resin film, and the second loop may be wound to surround the first loop.

At this time, the second terminal of the first loop and the fourth terminal of the second loop may be electrically connected through the second surface of the resin film.

Alternatively, the first loop and the second loop may be formed so that they do not exist in the same plane.

For example, the first loop and the second loop may be respectively formed on the first surface of the resin film and the second surface opposite to the first surface.

Alternatively, the first loop and the second loop may be formed on the first resin film layer and the second resin film layer, respectively, and the first resin film layer and the second resin film layer may be bonded.

According to an exemplary embodiment of the present invention, there is provided a personal portable terminal including a housing, a printed circuit board, and an antenna. The printed circuit board is disposed inside the housing, and an electronic element is mounted. The antenna is disposed inside the housing and includes a first loop and a second loop. The first loop starts from a first terminal electrically connected to the electronic device and is wound toward the second terminal. The second loop is wound toward a fourth terminal, which is started from a third terminal electrically connected to the first terminal and electrically connected to the second terminal, and is wound in the same direction as the first loop.

For example, the first loop and the second loop may be formed on the first side of the resin film, and the second loop may be wound to surround the first loop.

At this time, the second terminal of the first loop and the fourth terminal of the second loop may be electrically connected through the second surface of the resin film.

Alternatively, the first loop and the second loop may be formed so that they do not exist in the same plane.

For example, the first loop and the second loop may be respectively formed on the first surface of the resin film and the second surface opposite to the first surface.

Alternatively, the first loop and the second loop may be formed on the first resin film layer and the second resin film layer, respectively, and the first resin film layer and the second resin film layer may be bonded.

Meanwhile, the antenna may be formed on the inner surface of the housing.

For example, a groove may be formed on the inner surface of the housing, the antenna may be inserted into the groove, and the groove may be covered by the cover.

Alternatively, the antenna may be disposed inside the mold at the time of forming the housing, and then may be injection-molded so as to be integrally formed with the housing.

The antenna according to the exemplary embodiment of the present invention and the portable personal terminal including the antenna according to the present invention can reduce the resistance by substantially reducing the wire length of the coil while maintaining the inductance value by connecting the two coils in parallel to each other. So that the radiation efficiency can be increased.

When the first loop and the second loop are formed on the first surface of the resin film and the second surface opposite to the first surface, respectively, the first loop and the second loop are formed on the same surface, .

1 is a plan view schematically illustrating an antenna according to an exemplary embodiment of the present invention.
2 is a cross-sectional view illustrating a connection state of a first loop and a second loop of the antenna shown in FIG.
3 is a conceptual diagram of an antenna according to an exemplary embodiment of the present invention shown in FIG.
4 is a conceptual diagram of a conventional antenna shown for comparison with FIG.
5 is a perspective view schematically showing an antenna according to another exemplary embodiment of the present invention.
6 is a cross-sectional view illustrating an embodiment of the antenna shown in FIG.
7 is a cross-sectional view illustrating another embodiment of the antenna shown in FIG.
8 is a schematic perspective view illustrating a housing of a personal digital assistant including an antenna according to an exemplary embodiment of the present invention.
FIG. 9 is a diagram illustrating a performance test result of an antenna according to an exemplary embodiment of the present invention shown in FIG.
FIG. 10 is a graph showing a result of a performance test of a conventional antenna as a comparative example shown in FIG.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. In the accompanying drawings, the dimensions of the structures may be exaggerated to illustrate the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprising" or "having ", and the like, are intended to specify the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof. In addition, A and B are 'connected' and 'coupled', meaning that A and B are directly connected or combined, and other component C is included between A and B, and A and B are connected or combined .

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

FIG. 1 is a plan view schematically illustrating an antenna according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating a connection state of a first loop and a second loop of the antenna shown in FIG.

1 and 2, an antenna 100 according to an exemplary embodiment of the present invention is an antenna for transmitting and receiving signals of a predetermined frequency band, and includes a first loop 110 and a second loop 120 . For example, the predetermined frequency band is a frequency band for Magnetic Secure Transmission (MST), and the antenna 100 of the present invention can operate as a magnetic security transmission antenna.

The first loop 110 starts from the first terminal 111 and is wound toward the second terminal 112. The first loop 110 may be formed on the first surface 131 of the resin film 130.

The second loop 120 is wound toward a fourth terminal 122 starting from a third terminal 121 electrically connected to the first terminal 111 and electrically connected to the second terminal 112 , And is wound in the same direction as the first loop 110. Accordingly, the first loop 110 and the second loop 120 operate as inductors connected in parallel with each other. Operations of the first loop 110 and the second loop 120 connected to each other in parallel will be described in detail below with reference to FIGS. 3 and 4. FIG.

The second loop 120 may be formed on the first surface 131 of the resin film 130 in the same manner as the first loop 110. At this time, the second loop 120 may be wound to surround the first loop 110.

The first loop 110 and the second loop 120 may be formed, for example, by attaching a metal thin film to the resin film 130 and then patterning the metal thin film. That is, a metal thin film is adhered to the resin film 130 using an adhesive, or the resin film 130 and the metal thin film layer are overlapped and then passed through a heated roller to adhere the resin film 130 and the metal thin film After the mask pattern is formed, it can be dipped in the etching solution and patterned.

The second terminal 112 of the first loop 110 and the fourth terminal 122 of the second loop 120 are electrically connected to each other through the second surface 132 of the resin film 130 And can be electrically connected. More specifically, the second terminal 112 of the first loop 110 and the fourth terminal 122 of the second loop 120 are connected to the second face 132 of the resin film 130 And may be electrically connected through the formed connection wiring 140 and the via 133 passing through the resin film 130.

FIG. 3 is a conceptual diagram of an antenna according to an exemplary embodiment of the present invention shown in FIG. 1, and FIG. 4 is a conceptual diagram of a conventional antenna shown for comparison with FIG.

Both the antenna of the present invention disclosed in Fig. 3 and the conventional antenna disclosed in Fig. 4 include two turns, for example, so that the inductance felt at the center portion B is the same.

3, the current flowing through the first loop 110 flows between the first terminal 111 and the second terminal 112, and the current flowing through the second loop 120 flows through the first terminal 111 and the second terminal 112. However, in the case of the antenna 100 of the present invention, The current flowing between the first terminal 111 and the second terminal 112 flows. On the other hand, in the case of the conventional antenna 300 shown in FIG. 4, the current flows in a relatively long distance and the resistance increases because of a single loop.

Accordingly, the antenna according to the present invention can increase the radiation efficiency by reducing the resistance by substantially reducing the wire length of the coil while maintaining the inductance value by connecting the two coils in parallel to each other.

5 is a perspective view schematically showing an antenna according to another exemplary embodiment of the present invention. FIG. 6 is a cross-sectional view illustrating one embodiment of the antenna shown in FIG. 5, and FIG. 7 is a cross-sectional view illustrating another embodiment of the antenna shown in FIG.

The antenna according to another exemplary embodiment of the present invention shown in FIG. 5 is constructed by connecting a first loop and a second loop in parallel, like the antenna shown in FIG. However, although the first loop 110 and the second loop 120 of the antenna shown in FIG. 5 are formed in the same plane as the first loop 110 and the second loop 120 in FIG. 3, .

That is, the first loop 110 and the second loop 120 may be formed on the first surface of the resin film and the second surface opposite to the first surface, respectively.

In this case, since the second loop 120 does not rotate around the outer periphery of the first loop 110, the same inductance can be secured even when the overall size is reduced, as compared with the antenna disclosed in FIG.

That is, when the number of turns of the first loop 110 and the second loop 120 increases, a relatively large area is required. In this case, the second loop 120 may be divided into the first loop 110 The second loop 120 does not need to rotate outside the first loop 110, so that the overall loop size can be reduced.

6, the first loop 110 and the second loop 120 may be disposed on the same plane as the first loop 110 and the second loop 120 are not on the same plane, May be formed on the first surface 131 and the second surface 132 of the resin film. In this case, the first terminal 111 and the second terminal 112 of the first loop 110 are electrically connected to the third terminal 121 and the fourth terminal 122 of the second loop 120, 133, respectively.

Alternatively, the first loop 110 and the second loop 120 may be formed on the multilayer resin film as shown in FIG. That is, the first loop 110 and the second loop 120 are formed on the first resin film layer 130a and the second resin film layer 130b, respectively, and the first resin film layer 130a, The second resin film layer 130b may be bonded.

At this time, a connection pad 113 is formed on the lower surface of the first resin film layer 130a and is electrically connected to the first or second terminal 111 or 112 through the via 133, 113 are electrically connected to the third or fourth terminal 121 or 122 so that the first or second terminal 111 or 112 can be electrically connected to the third or fourth terminal 121 or 122 have.

In addition, the first resin film layer 130a and the second resin film layer 130b may be attached to each other using an adhesive (not shown), or may be attached to each other by applying heat.

8 is a schematic perspective view illustrating a housing of a personal digital assistant including an antenna according to an exemplary embodiment of the present invention. The antenna included in the portable personal terminal shown in FIG. 8 is the same as the antenna shown in FIG. 1, FIG. 3, or FIG. 5, and a duplicate description will be omitted.

3, 5, and 8, a personal portable terminal 200 according to an exemplary embodiment of the present invention includes a housing 210, a printed circuit board (not shown) (100).

The printed circuit board (not shown) is disposed inside the housing 210, and an electronic device (not shown) is mounted.

The antenna 100 is disposed inside the housing 210 and includes a first loop 110 and a second loop 120 as described above. The first loop 110 starts from the first terminal 111 and is wound toward the second terminal 112. The second loop 120 is wound toward a fourth terminal 122 starting from a third terminal 121 electrically connected to the first terminal 111 and electrically connected to the second terminal 112 , And is wound in the same direction as the first loop 110.

The first loop 110 and the second loop 120 of the antenna may be formed in the same plane as in FIG. 3, or may be formed in different planes as in FIG.

A groove 211 is formed on the inner surface of the housing 210. The antenna 100 is inserted into the groove 211 and the groove 211 can be covered by the cover 220. Although not shown, the cover 220 exposes the first to fourth terminals 111, 112, 121 and 122 shown in FIG. 1 including an opening. Through this opening (not shown), the antenna 100 can be electrically connected to an electronic device mounted on a printed circuit board (not shown).

Alternatively, the antenna 100 may be disposed inside the mold when the housing 210 is formed, and may be integrally formed with the housing 210 by injection molding. That is, after the resin film on which the pattern is formed is disposed in the mold for forming the housing 210, the melted plastic may be injected to dispose the antenna 100 inside the housing 210.

FIG. 9 is a view showing a result of performance test of an antenna according to an exemplary embodiment of the present invention shown in FIG. 3, FIG. 10 is a comparative example shown in FIG. 4, to be.

9 and 10 are graphs in which the recognition rate of the antenna is measured while the X-axis coordinate is fixed to 0 and the Y-Z plane is moved. That is, the row direction of the table shown in the upper part of Figs. 9 and 10 is the result of measurement while moving on the left and right sides as the Y axis coordinate, the center part as the origin, and the column direction is the Z axis coordinate, Results.

9 and 10 are graphs in which the Z axis coordinate is fixed to 0 and the recognition rate of the antenna moves on the X-Y plane. 9 and 10, the row direction of the table shown in the lower part is the result of measurement while moving along the X axis coordinate, the center part as the origin, the front and rear sides, the column direction as the Y axis coordinate, the center part as the origin, This is the result of measuring while moving.

In Figs. 9 and 10, a portion indicated by green is a position with a good recognition rate, and a portion indicated with red is a position with a poor recognition rate. In the case of the present invention shown in Fig. 9, the area indicated by green is much wider than that of the prior art shown in Fig. 10, and the performance of the antenna is improved.

As described above, according to the antenna and the portable personal terminal including the antenna according to the exemplary embodiment of the present invention, by connecting the two coils in parallel to each other, it is possible to maintain the inductance value, , The resistance can be reduced and the radiation efficiency can be increased.

While the present invention has been described in connection with what is presently considered to be practical and exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: Antenna
110: first loop
111: first terminal 112: second terminal
120: the second loop
121: third terminal 122: fourth terminal
130: Resin film
130a: first resin film layer 130b: second resin film layer
131: first side 132: second side
133: Via
140: Connection wiring
200: Personal portable terminal
210: housing 211: groove
220: cover

Claims (15)

An antenna for transmitting and receiving a signal of a predetermined frequency band,
A first loop starting from a first terminal and being wound toward a second terminal; And
A second loop wound from a third terminal electrically connected to the first terminal to a fourth terminal electrically connected to the second terminal and wound in the same direction as the first loop;
/ RTI >
The method according to claim 1,
Wherein the first loop and the second loop are formed on a first surface of the resin film, and the second loop is wound to surround the first loop.
The antenna according to claim 2, wherein the second terminal of the first loop and the fourth terminal of the second loop are electrically connected through the second surface of the resin film.
The method according to claim 1,
Wherein the first loop and the second loop do not lie in the same plane.
5. The method of claim 4,
Wherein the first loop and the second loop are respectively formed on a first surface of the resin film and a second surface opposite to the first surface.
5. The method of claim 4,
Wherein the first loop and the second loop are formed on the first resin film layer and the second resin film layer, respectively, and the first resin film layer and the second resin film layer are bonded.
housing;
A printed circuit board disposed inside the housing and having an electronic device mounted thereon; And
A first loop disposed within the housing and starting from a first terminal electrically connected to the electronic device and being wound toward a second terminal, and a second loop, starting from a third terminal electrically connected to the first terminal, And a second loop wound around a fourth terminal electrically connected to the first loop and wound in the same direction as the first loop, the antenna for transmitting / receiving a signal of a certain frequency band;
And a portable terminal.
8. The method of claim 7,
Wherein the first loop and the second loop are formed on a first surface of the resin film, and the second loop is wound so as to surround the first loop.
9. The method of claim 8,
Wherein the second terminal of the first loop and the fourth terminal of the second loop are electrically connected through the second surface of the resin film.
8. The method of claim 7,
Wherein the first loop and the second loop do not exist in the same plane.
11. The method of claim 10,
Wherein the first loop and the second loop are respectively formed on a first surface of the resin film and a second surface opposite to the first surface.
11. The method of claim 10,
Wherein the first loop and the second loop are formed on the first resin film layer and the second resin film layer, respectively, and the first resin film layer and the second resin film layer are bonded to each other.
8. The method of claim 7,
And the antenna is formed on the inner surface of the housing.
14. The method of claim 13,
A groove is formed in the inner surface of the housing,
The antenna is inserted into the groove,
Wherein the groove is covered by a cover.
14. The method of claim 13,
Wherein the antenna is disposed inside the mold at the time of forming the housing and then formed by injection and formed integrally with the housing.
KR1020160017057A 2016-02-15 2016-02-15 Complex antenna and mobile personal terminal having the same KR101794166B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10678390B2 (en) 2018-02-14 2020-06-09 Samsung Display Co., Ltd. Display device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011193245A (en) 2010-03-15 2011-09-29 Murata Mfg Co Ltd Antenna device, radio communication device and radio communication terminal
KR101166088B1 (en) 2010-09-17 2012-07-23 주식회사 이엠따블유 Multi band antenna
KR101358283B1 (en) 2012-05-15 2014-02-05 엘에스엠트론 주식회사 Loop antenna having multilayer structure
KR101465565B1 (en) 2013-01-09 2014-11-26 (주)드림텍 Loop antenna and producing method thereof
KR101488607B1 (en) 2013-07-18 2015-02-02 주식회사 이그잭스 Antenna structure for near field communication
KR101574322B1 (en) 2014-12-16 2015-12-04 주식회사 아이엠텍 Wireless communication multiplex antenna for portable electronic appliance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10678390B2 (en) 2018-02-14 2020-06-09 Samsung Display Co., Ltd. Display device

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