Antenna device, antenna structure including same, and image display device including same

Abstract

An antenna device, an antenna structure including the antenna device, and an image display device including the antenna structure are provided. The antenna apparatus includes a radiator, a transmission line connected to the radiator and including a first transmission line and a second transmission line facing each other, and an auxiliary radiator disposed between the first transmission line and the second transmission line and spaced apart from the radiator.

Description

Technical Field

[0001] The present invention relates to an antenna device, an antenna structure comprising the same, and an image display device comprising the same. Background Art

[0002] With the development of information technology, wireless communication technologies such as Wi-Fi, Bluetooth, etc. are combined or embedded in image display devices such as in the form of smart phones. In this case, an antenna may be combined with the image display device to provide a communication function.

[0003] With the rapid development of mobile communication technology, an antenna capable of operating high frequency or ultra-high frequency communication needs to be incorporated in an image display device.

[0004] In addition, as the image display device combined with the antenna becomes thinner and lighter, the space for accommodating the antenna may be reduced. Therefore, high-frequency and wide-band signal transmission and reception may not be easily implemented in a limited space.

[0005] Therefore, the construction of an antenna capable of transmitting and receiving various signals in multiple frequency bands in a limited space may be required. Summary of the invention

[0006] According to one aspect of the present invention, there is provided an antenna device having improved radiation characteristics.

[0007] According to one aspect of the present invention, there is provided an antenna structure comprising an antenna arrangement having improved radiation characteristics.

[0008] According to an aspect of the present invention, there is provided an image display device including an antenna device having improved radiation characteristics.

[0009] (1) An antenna device includes: a radiator; a transmission line connected to the radiator, the transmission line including a first transmission line and a second transmission line facing each other; and an auxiliary radiator provided between the first transmission line and the second transmission line and spaced apart from the radiator.

[0010] (2) The antenna device according to (1) above, wherein the first transmission line and the second transmission line are connected to both lateral end portions of a lower side portion of the radiator.

[0011] (3) The antenna device according to (1) above, wherein the first transmission line and the second transmission line extend from the radiator in different directions.

[0012] (4) The antenna device according to (1) above, wherein the auxiliary radiator includes an extension portion parallel to a lower side of the radiator and a connection portion branched from the extension portion and extending in a direction perpendicular to the extension portion.

[0013] (5) The antenna device according to (4) above, wherein an extending direction of the first transmission line and an extending direction of the second transmission line are symmetrical with respect to an extending direction of the connection portion.

[0014] (6) The antenna device according to (1) above, wherein the auxiliary radiator includes a first auxiliary radiator and a second auxiliary radiator facing each other.

[0015] (7) An antenna device according to (6) above, wherein the first auxiliary radiator includes a first extension portion parallel to the lower side of the radiator and a first connection portion extending from an end of the first extension portion in a direction perpendicular to the first extension portion, and the second auxiliary radiator includes a second extension portion spaced apart from the first extension portion and parallel to the lower side of the radiator and a second connection portion extending from an end of the second extension portion in a direction perpendicular to the second extension portion.

[0016] (8) The antenna device according to (6) above, wherein the first auxiliary radiator and the second auxiliary radiator have symmetrical shapes with respect to an imaginary line passing through the center of the radiator in the length direction.

[0017] (9) The antenna device according to (1) above, wherein the radiator includes a mesh structure, and the transmission line and the auxiliary radiator include a solid structure.

[0018] (10) An antenna structure comprising: the antenna device described above; and a circuit board electrically connected to the antenna device.

[0019] (11) The antenna structure according to (10) above, wherein the circuit board includes a core layer and a signal wiring arranged on one surface of the core layer and connected to the first transmission line and the second transmission line.

[0020] (12) The antenna structure according to (11) above, wherein the circuit board further includes a first ground portion which is arranged on the same layer as the signal wiring and is provided around the signal wiring to be spaced apart from the signal wiring.

[0021] (13) The antenna structure according to (12) above, wherein the auxiliary radiator is connected to the first ground portion.

[0022] (14) The antenna structure according to the above (11), wherein the circuit board further includes a second ground portion arranged on the other surface of the core layer opposite to the one surface.

[0023] (15) According to the antenna structure of (11) above, the antenna device further includes a signal pad connected to the transmission line and bonded to the signal wiring.

[0024] (16) The antenna structure according to the above (15), wherein the antenna device further includes a ground pad arranged around the signal pad and spaced apart from the signal pad.

[0025] (17) An image display device comprising: a display panel; and the above-mentioned antenna structure.

[0026] The antenna device according to the embodiment of the present invention may include a first transmission line and a second transmission line connected to a radiator facing each other. Therefore, two polarization directions (dual polarization) can be provided in one radiator.

[0027] In example embodiments, the antenna device may include an auxiliary radiator disposed between the first transmission line and the second transmission line and spaced apart from the radiator. Radiation of a resonance frequency band above about 35 GHz or from about 36 GHz to about 40 GHz may be achieved by the auxiliary radiator.

[0028] In one embodiment, the radiation of the resonance frequency band above about 28 GHz can be achieved by the radiator, and the radiation of the resonance frequency band above about 35 GHz or from about 36 GHz to about 40 GHz can be achieved by the auxiliary radiator. Therefore, signal transmission and reception can be achieved in two frequency bands (dual frequency bands). BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic plan view illustrating an antenna device according to an example embodiment.

[0030] Figure 2 is a schematic plan view illustrating an antenna device according to an example embodiment.

[0031] Figure 3 and Figure 4 is a schematic plan view illustrating an antenna structure according to an example embodiment.

[0032] Figure 5 is a schematic cross-sectional view illustrating an antenna structure according to an example embodiment.

[0033] Figure 6 and Figure 7 is a schematic plan view illustrating an antenna structure according to an example embodiment.

[0034] Figure 8 and Fig. 9 are respectively a schematic plan view and a cross-sectional view illustrating an image display device according to example embodiments.

[0035] Fig.10 is a schematic plan view showing an antenna structure according to a comparative example.

[0036] Fig.11A graph showing 2D radiation patterns of antenna devices according to Examples 1 and 2 and a comparative example.

[0037] Fig.12 : is a graph showing the return loss according to the frequency in the embodiment and the comparative example.

[0038] Fig.13 : is a graph showing the isolation according to the frequency in the embodiment and the comparative example.

[0039] Fig.14 : is a graph showing antenna gain according to frequency in the embodiment and the comparative example. DETAILED DESCRIPTION

[0040] An embodiment of the present invention provides an antenna device including a radiator. According to an exemplary embodiment, an antenna structure including the antenna device and a circuit board is also provided. In addition, an image display device including the antenna device is provided.

[0041] The antenna device may be, for example, a microstrip patch antenna manufactured in the form of a transparent film. The antenna device may be applied to, for example, a communication device for high frequency or ultra-high frequency (e.g., 3G, 4G, 5G or above) mobile communication. However, the application of the antenna device is not limited to the image display device, and the antenna device may be applied to various structures, such as vehicles, household appliances, architecture, buildings, etc.

[0042] However, those skilled in the art will appreciate that the embodiments described with reference to the accompanying drawings are provided to further understand the spirit of the present invention and are not intended to limit the subject matter disclosed in the detailed description and the appended claims.

[0043] The terms “first”, “second”, “one surface”, “the other surface”, “one end”, “the other end”, “upper”, “lower”, “top” and “bottom” are used herein to relatively distinguish positions of components and are not intended to indicate absolute positions.

[0044] Figure 1 is a schematic plan view illustrating an antenna device according to an example embodiment.

[0045] Reference Figure 1 , the antenna device 100 may include a first dielectric layer 110 and an antenna unit 120 disposed on the first dielectric layer 110 .

[0046] The first dielectric layer 110 may include polyester resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polybutylene terephthalate; cellulose resins such as diacetyl cellulose and triacetyl cellulose; polycarbonate resins; acrylic resins such as polymethyl (meth)acrylate and polyethyl (meth)acrylate; styrene resins such as polystyrene and acrylonitrile-styrene copolymers; polyolefin resins such as polyethylene, polypropylene, cycloolefin or polyolefin having a norbornene structure and ethylene-propylene copolymers; vinyl chloride resins; amide resins such as nylon and aromatic polyamide; imide resins; polyether sulfone resins; sulfone resins; polyether ether ketone resins; polyphenylene sulfide resins; vinyl alcohol resins; vinylidene chloride resins; vinyl butyral resins; allyl resins; polyoxymethylene resins; epoxy resins; polyurethane or acrylic polyurethane resins; silicone resins, etc. They may be used alone or in combination.

[0047] In some embodiments, the first dielectric layer 110 may include an adhesive film such as an optically clear adhesive (OCA), an optically clear resin (OCR), or the like.

[0048] In some embodiments, the first dielectric layer 110 may include an inorganic insulating material such as glass, silicon oxide, silicon nitride, silicon oxynitride, or the like.

[0049] In one implementation, the first dielectric layer 110 may be provided as a substantially single layer.

[0050] In one embodiment, the first dielectric layer 110 may have a multilayer structure of at least two layers. For example, the first dielectric layer 110 may include a base layer and a dielectric layer, and may include an adhesive layer between the base layer and the dielectric layer.

[0051] The impedance or inductance of the antenna unit 120 may be generated by the first dielectric layer 110, so that the frequency band in which the antenna structure can be driven or operated can be adjusted. In some embodiments, the dielectric constant of the first dielectric layer 110 may be adjusted in the range of about 1.5 to about 12. When the dielectric constant exceeds about 12, the driving frequency may be excessively reduced, and the desired high frequency band driving may not be achieved.

[0052] In example embodiments, the antenna unit 120 may include a radiator 122 and a transmission line 124 connected to the radiator 122. The transmission line 124 may extend from the radiator 122.

[0053] For example, the radiator 122 may have a polygonal flat plate shape, and the transmission line 124 may have a smaller width than the radiator 122 and may be connected to one end or one side of the radiator 122. The radiator 122 and the transmission line 124 may be formed as a single member integrally connected to each other.

[0054] The target resonant frequency of the antenna device 100 may be adjusted according to the shape / size of the radiator 122. In a non-limiting embodiment, the radiator 122 may be designed to radiate in a high frequency band / ultra-high frequency band above 3G, 4G, 5G. For example, radiation in a frequency band above 0.5 GHz, above 1 GHz, above 10 GHz, above 20 GHz, above 30 GHz, or above 40 GHz may be achieved from the radiator 122.

[0055] For example, the radiator 122 may be provided as a high frequency band radiating portion of the antenna unit 120. In one embodiment, the resonant frequency of the radiator 122 may be above about 28 GHz.

[0056] The transmission line may include a first transmission line 124a and a second transmission line 124b facing each other connected to the radiator 122. Therefore, two polarization directions (dual polarization) may be realized in a single radiator.

[0057] In some embodiments, the first transmission line 124a and the second transmission line 124b may be respectively connected to two lateral ends of the lower side of the radiator 122 (e.g., two vertices of the lower side of the radiator 122). For example, at least a portion of the radiator 122 and the transmission line 124 may be formed as a single member integrally connected to each other.

[0058] The first transmission line 124a and the second transmission line 124b may extend in different directions from the radiator 122. Therefore, a dual polarization characteristic may be implemented from one radiator 122.

[0059] In some embodiments, the angle formed by the extension directions of the first transmission line 124a and the second transmission line 124b may be about 90°. For example, the extension directions of the first transmission line 124a and the second transmission line 124b may be orthogonal to each other. In one embodiment, the first transmission line 124a and the second transmission line 124b may extend in directions passing through the center of the radiator 122, respectively.

[0060] Thus, the radiator 122 may be fed in two substantially orthogonal directions via the first transmission line 124a and the second transmission line 124b. For example, vertical radiation and horizontal radiation may be achieved from the radiator 122 simultaneously.

[0061] In some embodiments, the first transmission line 124a and the second transmission line 124b may be arranged symmetrically with respect to each other. For example, the first transmission line 124a and the second transmission line 124b may be arranged symmetrically with respect to an imaginary line VL passing through the center of the radiator 122 in the length direction. Therefore, the signal strength in both polarization directions may become substantially uniform.

[0062] In an example embodiment, the antenna unit 120 may include an auxiliary radiator 123 disposed between the first transmission line 124a and the second transmission line 124b and spaced apart from the radiator 122. For example, the auxiliary radiator 123 may be driven by coupling with an electric field of the radiator 122 and / or the transmission line 124.

[0063] For example, the auxiliary radiator 123 may be provided as an ultra-high frequency band radiation portion of the antenna unit 120. For example, radiation in a resonance frequency band above about 35 GHz or from about 36 GHz to about 40 GHz may be achieved by the auxiliary radiator 123.

[0064] In one embodiment, radiation in a resonance frequency band above about 28 GHz may be achieved by the radiator 122, and radiation in a resonance frequency band above about 35 GHz or from about 36 GHz to about 40 GHz may be achieved by the auxiliary radiator 123. Thus, signal transmission and reception may be achieved in two frequency bands (dual frequency bands).

[0065] For example, the current direction at the lower end of the radiator 122 may be guided to the center of the radiator 122 by the auxiliary radiator 123. Therefore, the amount of offset current of the radiator 122 may be reduced, and thus a dual-band dual-polarization antenna may be implemented.

[0066] In some embodiments, the auxiliary radiator 123 may include an extension portion 125 extending parallel to a lower side of the radiator 122 , and a connection portion 127 branching from the extension portion 125 and extending in a direction perpendicular to the extension portion 125 .

[0067] For example, the extension portion 125 may be adjacent to a lower side of the radiator 122 between the first and second transmission lines 124a and 124b, and the connection portion 127 may branch from a central portion of the extension portion 125. In one embodiment, the auxiliary radiator 123 may have a T-shape.

[0068] For example, the extending portion 125 and the connecting portion 127 may be formed as a single member integrally connected to each other.

[0069] For example, the extending portion 125 and the connecting portion 127 may have a bar shape, respectively.

[0070] For example, the shapes and positions of the extending portion 125 and the connecting portion 127 may be adjusted in consideration of the ultra-high frequency band radiation as described above.

[0071] In some embodiments, the shortest distance D between the radiator 122 and the auxiliary radiator 123 may be in the range of about 0.5 μm to about 10 μm. For example, the shortest distance D between the lower side of the radiator 122 and the upper side of the extension portion 125 of the auxiliary radiator 123 may be in the range of about 0.5 μm to about 10 μm. Within the above range, the auxiliary radiator 123 may be coupled to the radiator 122 to fully realize dual-band radiation while further suppressing noise generation and isolation degradation.

[0072] In some embodiments, the extension direction of the first transmission line 124a and the extension direction of the second transmission line 124b may be symmetrical with respect to the extension direction of the connection portion 127. Therefore, while achieving dual-band radiation, the signal strength in two polarization directions may become substantially uniform.

[0073] Figure 2 is a schematic plan view illustrating an antenna device according to an example embodiment.

[0074] Reference Figure 2 , the auxiliary radiator 123 may include a first auxiliary radiator 123a and a second auxiliary radiator 123b facing each other.

[0075] In some embodiments, the first auxiliary radiator 123a may include a first extending portion 125a parallel to a lower side of the radiator 122 and a first connecting portion 127a extending from an end of the first extending portion 125a in a direction perpendicular to the first extending portion 125a.

[0076] In some embodiments, the second auxiliary radiator 123b may include a second extension portion 125b spaced apart from the first extension portion 125a and parallel to the lower side of the radiator 122, and a second connection portion 127b extending from an end of the second extension portion 125b in a direction perpendicular to the second extension portion 125b.

[0077] In some embodiments, the first auxiliary radiator 123a and the second auxiliary radiator 123b may have symmetrical shapes with respect to an imaginary line VL passing through the center of the radiator 122 in the length direction. Therefore, the uniformity and stability of the radiation characteristics in the ultra-high frequency band may be improved.

[0078] For example, the shapes and positions of the extending portions 125a and 125b and the connecting portions 127a and 127b may be adjusted in consideration of the ultra-high frequency band radiation as described above.

[0079] In some embodiments, the signal pad 126 may be disposed at the end of the transmission line 124 of the antenna device 100. The signal pad 126 may be a single member substantially integral with the transmission line 124. In this case, the end of the transmission line 124 may serve as the signal pad 126.

[0080] For example, the radiator 122 and the signal pad 126 may be electrically connected via the transmission line 124 .

[0081] The circuit board and the antenna unit 120 may be electrically connected through the signal pad 126. Thus, signal transmission and reception of an antenna driving integrated circuit (IC) chip of the circuit board and the radiator 122 may be achieved.

[0082] In some embodiments, the antenna unit 120 may further include a ground pad 128 spaced apart from the signal pad 126 and disposed around the signal pad 126. The ground pad 128 may be electrically and physically separated from the transmission line 124 and the signal pad 126. In one embodiment, a pair of ground pads 128 facing each other with the signal pad 126 interposed therebetween may be provided. Therefore, the generation of noise from the signal transmitted through the signal pad 126 may be reduced.

[0083] In some embodiments, a connection pad 129 may be provided at an end of the auxiliary radiator 123. The connection pad 129 may be a single member substantially integrated with the auxiliary radiator 123. In this case, an end of the connection portion 127 of the auxiliary radiator 123 may serve as the connection pad 129.

[0084] In some embodiments, the first connection pad 129a may be disposed at an end of the first connection portion 127a of the first auxiliary radiator 123a, and the second connection pad 129b may be disposed at an end of the second connection portion 127b of the second auxiliary radiator 123b.

[0085] For example, the signal pad 126 , the ground pad 128 , and the connection pad 129 may be disposed in a bonding region BR to which the antenna device 100 and the circuit board are bonded.

[0086] For example, the bonding stability of the antenna device 100 and the circuit board in the bonding region BR may be improved by the ground pad 128 .

[0087] In one embodiment, the signal pad 126, the ground pad 128, and the connection pad 129 may include a solid structure. Therefore, an increase in resistance due to bonding at a connection portion of the antenna device 100 and the circuit board 200 may be suppressed, and feeding efficiency may be enhanced.

[0088] Figure 3 and Figure 4 is a schematic plan view showing an antenna structure according to an example embodiment. For example, Figure 3 shows an antenna structure according to an example embodiment in which the auxiliary radiator 123 is formed in a single conductive pattern, and Figure 4 An antenna structure according to an example embodiment is shown in which the auxiliary radiator 123 includes a first auxiliary radiator 123a and a second auxiliary radiator 123b.

[0089] Figure 5 is a schematic cross-sectional view showing an antenna structure according to an example embodiment. Figure 5 In the thickness direction along Figure 3 and Figure 4 A cross-sectional view taken along line II'.

[0090] Reference Figures 3 to 5 , the antenna structure may include an antenna device 100 and a circuit board 200 electrically connected to the antenna element device.

[0091] In some embodiments, the antenna device 100 may further include a second dielectric layer 130 disposed on the first dielectric layer 110 and the antenna unit 120. The second dielectric layer 130 may cover at least a portion of the top surface of the antenna unit 120. Therefore, the impedance of the antenna unit 120 may be adjusted, and the antenna unit 120 may be protected from external impact.

[0092] In some embodiments, the antenna device 100 may further include a third dielectric layer 140 disposed below a bottom surface of the first dielectric layer 110 .

[0093] In one implementation, the second dielectric layer 130 and the third dielectric layer 140 may include the same type of material and / or stack structure as the first dielectric layer 110 .

[0094] In one implementation, the antenna ground portion 150 may be disposed under a bottom surface of the first dielectric layer 110 and / or the third dielectric layer 140 .

[0095] In one embodiment, a conductive member of an image display device or a display panel to which the antenna structure is applied may be used as the antenna ground 150 .

[0096] For example, the conductive member may include electrodes or wirings included in the thin film transistor array panel, such as gate electrodes, source / drain electrodes, pixel electrodes, common electrodes, data lines, scan lines, and the like.

[0097] In one embodiment, a metal member such as a SUS plate, a sensor member such as a digitizer, a heat sink, which may be disposed at the rear of the image display device, may be used as the antenna ground 150 .

[0098] In one embodiment, the antenna device 100 may further include a protective layer 160 disposed on the second dielectric layer 130. The protective layer 160 may include substantially the same type of material as the dielectric layers 110, 120, and 130.

[0099] In one embodiment, the protective layer 160 may include a cover window. The cover window may include, for example, ultra-thin glass (UTG) or a transparent resin film. Therefore, external impact applied to the antenna device 100 may be reduced or mitigated.

[0100] The antenna unit 120 and / or the antenna ground portion 150 may include silver (Ag), gold (Au), copper (Cu), aluminum (Al), platinum (Pt), palladium (Pd), chromium (Cr), titanium (Ti), tungsten (W), niobium (Nb), tantalum (Ta), vanadium (V), iron (Fe), manganese (Mn), cobalt (Co), nickel (Ni), zinc (Zn), tin (Sn), molybdenum (Mo), calcium (Ca), or an alloy containing at least one of these metals. They may be used alone or in combination of two or more.

[0101] In one embodiment, the antenna unit 120 may include silver (Ag) or a silver alloy (eg, silver-palladium-copper (APC)) or copper (Cu) or a copper alloy (eg, copper-calcium (CuCa)) to achieve low resistance and fine line width patterns.

[0102] In some embodiments, the antenna unit 120 may include a transparent conductive oxide, such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnOx), indium zinc tin oxide (IZTO), and the like.

[0103] In some embodiments, the antenna unit 120 may include a stacked structure of a transparent conductive oxide layer and a metal layer. For example, the antenna unit 120 may include a double-layer structure of a transparent conductive oxide layer-metal layer, or a three-layer structure of a transparent conductive oxide layer-metal layer-transparent conductive oxide layer. In this case, the flexibility can be improved by the metal layer, and the signal transmission speed can be improved by the low resistance of the metal layer. The corrosion resistance and transparency can be improved by the transparent conductive oxide layer.

[0104] The antenna unit 120 may include a blackened portion so that reflectivity at the surface of the antenna unit 120 may be reduced to suppress visual pattern recognition due to light reflection.

[0105] In one embodiment, the surface of the metal layer included in the antenna unit 120 may be converted into a metal oxide or a metal sulfide to form a black layer. In one embodiment, a black layer such as a black material coating or plating may be formed on the antenna unit 120 or the metal layer. The black material or plating may include silicon, carbon, copper, molybdenum, tin, chromium, molybdenum, nickel, cobalt, or an oxide, sulfide, or alloy containing at least one of them.

[0106] The composition and thickness of the blackened layer may be adjusted in consideration of the reflectivity reducing effect and the antenna radiation characteristics.

[0107] In some embodiments, the radiator 122 may include a mesh structure, and the transmission line 124 and the auxiliary radiator 123 may include a solid structure. For example, at least a portion of the radiator 122 may form a mesh structure, and the remaining portion may form a solid structure.

[0108] In one embodiment, the lower portion of the radiator 122, the transmission line 124, and the auxiliary radiator 123 may be included in the non-display area NDA of the image display device and may be formed to have a solid structure. In this case, the remaining portion of the radiator 122 may be included in the display area DA of the image display device and may be formed to have a mesh structure. Therefore, the signal transmission / reception efficiency can be improved while preventing the user from visually recognizing the antenna unit 120.

[0109] In example embodiments, the circuit board 200 may include a core layer 210 and a signal wiring 220 disposed on one surface of the core layer 210. In one embodiment, the circuit board 200 may include a flexible printed circuit board (FPCB).

[0110] For example, the core layer 210 may include a flexible resin such as polyimide resin, modified polyimide (MPI), epoxy resin, polyester, cycloolefin polymer (COP), liquid crystal polymer (LCP), etc. In one embodiment, the core layer 210 may include polyimide resin or MPI.

[0111] In some embodiments, the signal wiring 220 may be connected to each of the first transmission line 124a and the second transmission line 124b. For example, one end of the signal wiring 220 may be bonded to the signal pad 126 so that the transmission line 124 and the signal wiring 220 may be connected. Therefore, signal transmission and / or feeding between the antenna driving IC chip and the antenna unit 120 may be performed through the circuit board 200.

[0112] In some embodiments, the circuit board 200 may include a first ground portion 230 disposed at the same layer or level as the signal wiring 220 .

[0113] The first ground portion 230 may be disposed around the signal wiring 220 to be spaced apart from the signal wiring 220 by a predetermined distance. Therefore, noise around the signal wiring 220 may be blocked, and the concentration of feeding through the signal wiring 220 may be enhanced.

[0114] In some embodiments, the auxiliary radiator 123 of the antenna unit 120 may be electrically connected to the first ground portion 230 of the circuit board 200. Therefore, the sensitivity of signal transmission and reception in the ultra-high frequency band through the auxiliary radiator 123 may be improved and noise may be reduced.

[0115] like Figure 5 As shown, the antenna structure may further include a conductive intermediate structure 250 disposed between the antenna device 100 and the circuit board 200 in the bonding region BR. For example, the transmission line 124 and the circuit wiring 220 and / or the auxiliary radiator 123 and the first ground portion 230 may be bonded or adhered to each other through the conductive intermediate structure 250. For example, the antenna unit 120, the conductive intermediate structure 250, and the signal wiring 220 / the first ground portion 230 may be sequentially contacted or stacked in the bonding region BR.

[0116] For example, the conductive intermediate structure 250 may be attached to the signal pad 126, the ground pad 128, and the connection pad 129 of the antenna unit 120. Thereafter, the end of the signal wiring 220 and the end of the first ground portion 230 may be bonded to the signal pad 126 and the connection pad 129, respectively, by a heating / pressurizing process. The ground pad 128 may be used as a bonding pad bonded to the first ground portion 230 to improve bonding stability, and may absorb noise around the signal pad 126 to release the noise through the first ground portion 230.

[0117] Therefore, the signal wiring 220 and the transmission line 124 may be connected through the signal pad 126 , and the first ground 230 and the auxiliary radiator 123 may be connected through the connection pad 129 .

[0118] For example, the signal wiring 220 and the first ground portion 230 may be disposed together on one surface of the core layer 210 .

[0119] In some embodiments, the circuit board 200 may further include a second ground portion 240 disposed on the other surface of the core layer 210 facing the one surface. Therefore, the concentration of the signal transmitted to the signal wiring 220 may be improved, and vertical noise may be shielded.

[0120] In some embodiments, the signal wiring 220 , the first ground portion 230 , and / or the second ground portion 240 may include the same type of material as the antenna unit 120 .

[0121] In one implementation, a cover film for protecting the wiring and the electrode layer may be provided on the one surface and / or the other surface of the core layer 210 .

[0122] Figure 6 and Figure 7 is a schematic plan view illustrating an antenna structure according to an example embodiment.

[0123] Reference Figure 6 and Figure 7 , the dummy mesh layer 170 may be disposed around the radiator 122, the transmission line 124, and the auxiliary radiator 123. The dummy mesh layer 170 may include a mesh structure substantially the same as the mesh structure included in the radiator 122. Therefore, the spatial distribution of the conductive pattern may become uniform in the display area DA of the image display device, so that visual recognition of the radiator 122 may be suppressed.

[0124] The dummy mesh layer 170 may be formed together with the radiator 122 by etching the same mesh layer. The dummy mesh layer 170 may be physically separated from the radiator 122, the transmission line 124, and the auxiliary radiator 123 by a separation region 175.

[0125] Figure 8 and Fig. 9 are respectively a schematic plan view and a cross-sectional view illustrating an image display device according to example embodiments.

[0126] Figure 8 The front or window surface of the image display device 300 is shown. The front of the image display device 300 may include a display area (DA) 330 and a non-display area (NDA) 340. The non-display area 340 may correspond to a light shielding portion or a frame portion of the image display device 300, for example.

[0127] The antenna device 100 according to example embodiments may be disposed toward a front surface of the image display device 300 , and, for example, may be disposed on a display panel.

[0128] In some embodiments, the antenna device 100 may be attached to the display panel in the form of a film.

[0129] In one embodiment, the antenna device 100 may be formed to span the display area 330 and the non-display area 340 of the image display device 300. In one embodiment, the radiator 122 may at least partially overlap the display area 330.

[0130] As described above, transmission line 124, auxiliary radiator 123, signal pad 126, ground pad 128 and connection pad 129 may overlap non-display area 340 in the thickness direction. For example, a portion of antenna unit 120 having a solid structure may overlap non-display area 340.

[0131] In some embodiments, the antenna device 100 may be located in a central portion of one side of the image display device 300. Therefore, it is possible to prevent radiation performance at either end of the one side from being degraded.

[0132] The antenna device 100 may be fed or driven through the circuit board 200 .

[0133] The antenna driving IC chip 260 may be mounted on the circuit board 200. Fig. 9 As shown, an intermediate circuit board 270 such as a rigid printed circuit board may be disposed between the circuit board 200 and the antenna driving IC chip 260. In one embodiment, the antenna driving IC chip 260 may be directly mounted on the circuit board 200.

[0134] Reference Fig. 9 The image display device 300 may include a display panel 310 and the above-mentioned antenna device 100 disposed on the display panel 310 .

[0135] In example embodiments, an optical layer 320 may be further included on the display panel 310. For example, the optical layer 320 may be a polarization layer including a polarizer or a polarization plate.

[0136] The circuit board 200 (eg, a flexible printed circuit board) may be bent along a lateral bending profile of the display panel 310 and disposed at the rear of the image display device 300 , and may extend toward an intermediate circuit board 270 (eg, a main board) on which an antenna driving IC chip 260 is mounted.

[0137] The circuit board 200 and the intermediate circuit board 270 may be joined or interconnected by a connector so that feeding of the antenna device 100 and antenna driving control may be performed by the antenna driving IC chip 260 .

[0138] Hereinafter, preferred embodiments are proposed to more specifically describe the present invention. However, the following embodiments are provided only to illustrate the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made within the scope and spirit of the present invention. These modifications and variations are appropriately included in the appended claims.

[0139] Example 1

[0140] like Figure 1As shown, a conductive line including copper (Cu) is patterned on a multi-layer COP dielectric layer (a first dielectric layer and a third dielectric layer), and a COP dielectric layer (a second dielectric layer) is formed on the conductive line to obtain an antenna device.

[0141] The wire has a line width of 2 μm and a thickness of 0.5 μm.

[0142] The resonant frequency of the antenna unit is adjusted to have a dual frequency band of about 28 GHz and about 39 GHz.

[0143] Example 2

[0144] The antenna device was manufactured by the same method as in Example 1, but the wire including copper was patterned as Figure 2 Shape shown.

[0145] Comparative Example

[0146] Fig.10 is a schematic plan view showing an antenna structure according to a comparative example.

[0147] like Fig.10 As shown, the antenna device is manufactured by the same method as in Embodiment 1, but the auxiliary radiator is not formed.

[0148] Experimental example

[0149] (1) Measurement of antenna gain and 2D radiation pattern

[0150] The radiation patterns indicating the antenna gain and beam waveform of the radiators of the antenna devices manufactured according to the embodiment and the comparative example were confirmed using an HFSS simulator (Ansys Inc.).

[0151] Fig.11 A graph showing 2D radiation patterns of the antenna devices of the embodiment and the comparative example.

[0152] Fig.11 The chart (A) and Fig.11 Graph (B) is a graph of the 2D radiation pattern of the antenna device of Example 1. Fig.11 The chart (C) and Fig.11 Graph (D) is a graph of the 2D radiation pattern of the antenna device of Example 2. Fig.11 The chart (E) and Fig.11 Graph (F) is a graph of the 2D radiation pattern of the antenna device of the comparative example.

[0153] Specifically, Fig.11 Graph (A), Graph (C) and Graph (E) are graphs of 2D radiation patterns in the 28 GHz frequency band. Fig.11Graph (B), graph (D), and graph (F) are graphs of 2D radiation patterns in the 39 GHz frequency band.

[0154] exist Fig.11 In the embodiment, if the signal strength difference (cross-polarization discrimination: XPD) between co-planar polarization (Co-pol) and cross-polarization (X-pol) is 10 dB or more, it can be evaluated that dual-polarization radiation is fully achieved in the corresponding frequency band.

[0155] XPDs of frequency bands according to the embodiment and the comparative example are shown in Table 1 below.

[0156] [Table 1]

[0157] XPD(dB)_28GHz XPD(dB)_39GHz Example 1 10.4 16.7 Example 2 10.6 20.1 Comparative Example 11.5 7.2

[0158] Reference Fig.11 As shown in Table 1, the XPD in both the 28 GHz band and the 39 GHz band is 10 dB or more in Examples 1 and 2. In the comparative example, the XPD in the 39 GHz band is less than 10 dB.

[0159] Therefore, the antenna devices of Examples 1 and 2 are dual-band dual-polarization antenna devices operable in the 28 GHz and 39 GHz bands. However, the antenna device of the comparative example is confirmed to be a single-band antenna device that cannot operate in the 39 GHz band due to the omission of the auxiliary radiator.

[0160] (2) Measurement of return loss, isolation and antenna gain

[0161] The return loss, isolation, and antenna gain according to frequency were measured / confirmed by connecting a port to a signal pad of each antenna device manufactured according to the embodiment and the comparative example.

[0162] An E5080B ENA network analyzer was used as the measurement device and HFSS simulation was used as the simulator.

[0163] Fig.12 : is a graph showing the return loss according to the frequency of the embodiment and the comparative example. Fig.13 : is a graph showing the isolation according to the frequency of the embodiment and the comparative example. Fig.14 : is a graph showing antenna gain according to frequency in the embodiment and the comparative example.

[0164] Reference Figure 12 to Figure 14 In the embodiment, the return loss, isolation and antenna gain are generally improved in the 28 GHz band and the 39 GHz band (dual-band radiation). In the comparative example, the return loss, isolation and antenna gain in the 39 GHz band are smaller than those in the embodiment (single-band radiation).

Claims

1. An antenna device, comprising: Radiator; a transmission line connected to the radiator, the transmission line including a first transmission line and a second transmission line facing each other; as well as An auxiliary radiator is disposed between the first transmission line and the second transmission line and is spaced apart from the radiator.

2. The antenna device according to claim 1, wherein: The first transmission line and the second transmission line are connected to both lateral ends of a lower side of the radiator.

3. The antenna device according to claim 1, wherein: The first transmission line and the second transmission line extend from the radiator in different directions.

4. The antenna device according to claim 1, wherein: The auxiliary radiator includes an extending portion parallel to a lower side of the radiator and a connecting portion branched from the extending portion and extending in a direction perpendicular to the extending portion.

5. The antenna device according to claim 4, wherein: An extending direction of the first transmission line and an extending direction of the second transmission line are symmetrical with respect to an extending direction of the connection portion.

6. The antenna device according to claim 1, wherein: The auxiliary radiator includes a first auxiliary radiator and a second auxiliary radiator facing each other.

7. The antenna device according to claim 6, wherein: The first auxiliary radiator includes a first extending portion parallel to a lower side of the radiator and a first connecting portion extending from an end of the first extending portion in a direction perpendicular to the first extending portion, and The second auxiliary radiator includes a second extending portion spaced apart from the first extending portion and parallel to a lower side of the radiator, and a second connecting portion extending from an end of the second extending portion in a direction perpendicular to the second extending portion.

8. The antenna device according to claim 6, wherein: The first auxiliary radiator and the second auxiliary radiator have symmetrical shapes with respect to an imaginary line passing through centers of the radiators in a length direction.

9. The antenna device according to claim 1, wherein: The radiator includes a mesh structure, and the transmission line and the auxiliary radiator include a solid structure.

10. An antenna structure, comprising: The antenna device according to claim 1; as well as A circuit board is electrically connected to the antenna assembly.

11. The antenna structure according to claim 10, wherein: The circuit board includes a core layer and a signal wiring arranged on one surface of the core layer and connected to the first transmission line and the second transmission line.

12. The antenna structure according to claim 11, wherein: The circuit board further includes a first ground portion arranged at the same layer as the signal wiring and disposed around the signal wiring to be spaced apart from the signal wiring.

13. The antenna structure according to claim 12, wherein: The auxiliary radiator is connected to the first ground.

14. The antenna structure according to claim 11, wherein: The circuit board further includes a second ground portion disposed on another surface of the core layer opposite to the one surface.

15. The antenna structure according to claim 11, wherein: The antenna device further includes a signal pad connected to the transmission line and bonded to the signal wiring.

16. The antenna structure according to claim 15, wherein: The antenna device further includes a ground pad arranged around the signal pad and spaced apart from the signal pad.

17. An image display device, comprising: Display panel; as well as The antenna structure according to claim 10.

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