WO2023223893A1 - Dispositif d'antenne - Google Patents

Dispositif d'antenne Download PDF

Info

Publication number
WO2023223893A1
WO2023223893A1 PCT/JP2023/017438 JP2023017438W WO2023223893A1 WO 2023223893 A1 WO2023223893 A1 WO 2023223893A1 JP 2023017438 W JP2023017438 W JP 2023017438W WO 2023223893 A1 WO2023223893 A1 WO 2023223893A1
Authority
WO
WIPO (PCT)
Prior art keywords
metal layer
antenna
antenna device
loop slot
loop
Prior art date
Application number
PCT/JP2023/017438
Other languages
English (en)
Japanese (ja)
Inventor
大輔 山中
健 茂木
翔 吉田
Original Assignee
Ａｇｃ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ａｇｃ株式会社 filed Critical Ａｇｃ株式会社
Publication of WO2023223893A1 publication Critical patent/WO2023223893A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction

Definitions

  • the present disclosure relates to an antenna device.
  • a flexible substrate Conventionally, a flexible substrate, an antenna element provided on the front or back surface of the flexible substrate, a feeder line provided on the front or back surface of the flexible substrate and feeding power to the antenna element, and stacked on the back side of the flexible substrate.
  • an antenna device that includes a flexible and bendable plate-shaped dielectric material, and a reflecting plate provided on the back side of the dielectric material.
  • the antenna element is a loop slot antenna formed on a metal layer provided on the front or back side of a flexible substrate, and by feeding power at two feeding points, it radiates two types of radio waves with polarization directions that are 90 degrees different from each other. It is possible (for example, see Patent Document 1).
  • An antenna device includes a metal layer that is polygonal in plan view, and a loop-shaped loop slot antenna that is polygonal in plan view formed on the metal layer, and
  • a metal layer that is polygonal in plan view
  • a loop-shaped loop slot antenna that is polygonal in plan view formed on the metal layer
  • the area of the metal layer is Sg
  • the area inside the area surrounded by the loop slot antenna among the area Sg of the metal layer is Si, 1 ⁇ Sg/Si ⁇ 30, and the outer edge of the metal layer in plan view is , has a side parallel to at least one side of the loop slot antenna, and a side that is not parallel to all sides of the loop slot antenna.
  • FIG. 1 is a diagram showing an antenna device 100 according to an embodiment. It is a figure showing an example of antenna device 10 for comparison. 5 is a diagram showing the polarization direction of the main component and the polarization direction of the cross component of radio waves radiated when power is fed to the feeding point FP2 of the loop slot antenna 120.
  • FIG. It is a figure showing simulation model 10A of antenna device 10 for comparison. It is a figure showing simulation model 10A of antenna device 10 for comparison. It is a figure showing the radiation pattern of simulation model 10A for comparison. It is a figure showing the radiation pattern of simulation model 10A for comparison.
  • 3 is a diagram showing a simulation model 100A of the antenna device 100. FIG. It is a figure showing the radiation pattern of simulation model 100A.
  • FIG. 3 is a diagram showing a simulation model 100B of the antenna device 100.
  • FIG. 3 is a diagram showing a simulation model 100B of the antenna device 100.
  • FIG. It is a figure showing the radiation pattern of simulation model 100B.
  • 3 is a diagram showing a simulation model 100C of the antenna device 100.
  • FIG. 3 is a diagram showing a simulation model 100C of the antenna device 100.
  • FIG. 3 is a diagram summarizing simulation results.
  • FIG. 3 is a diagram summarizing simulation results.
  • FIG. 3 is a diagram showing a state in which the substrate 101 and the metal layer 110 are curved. It is a figure showing antenna device 100M1 of the 1st modification of an embodiment. It is a figure showing the radiation pattern of antenna device 100M1. It is a figure showing the radiation pattern of antenna device 100M1. It is a figure which shows the metal layer 110M2 of the 2nd modification of embodiment. It is a figure showing a simulation result.
  • FIG. 3 is a diagram showing a radiation pattern of an antenna device including a metal layer 110M2.
  • FIG. 3 is a diagram showing a radiation pattern of an antenna device including a metal layer 110M2. It is a simulation result of a Smith chart showing the impedance characteristic seen from FP1 of the antenna device including the metal layer 110M2.
  • FIG. 3 is a diagram showing antenna device 100M1 of the 1st modification of an embodiment. It is a figure showing the radiation pattern of antenna device 100M1. It is a figure showing the radiation pattern of antenna device 100M1. It is a figure which
  • FIG. 7 is a diagram showing an example of frequency characteristics of S11 parameters obtained in an antenna device including a metal layer 110M2. It is a figure which shows the metal layer 110M2 of the 2nd modification of embodiment. It is a figure which shows the simulation result of the antenna device containing metal layer 110M2. It is a figure which shows the simulation result of the antenna device containing metal layer 110M2. It is a Smith chart showing the impedance characteristics of the antenna device including the metal layer 110M2.
  • FIG. 7 is a diagram showing an example of frequency characteristics of S11 parameters obtained in an antenna device including a metal layer 110M2. It is a Smith chart showing the impedance characteristics of the antenna device including the metal layer 110M2.
  • FIG. 7 is a diagram showing an example of frequency characteristics of S11 parameters obtained in an antenna device including a metal layer 110M2. It is a Smith chart showing the impedance characteristics of the antenna device including the metal layer 110M2.
  • FIG. 7 is a diagram showing an example of frequency characteristics of S11 parameters obtained in an antenna device including a metal layer 110M2. It is a figure showing an example of antenna device 100M3 of the 3rd modification of an embodiment. It is a figure showing an example of the radiation pattern of antenna device 100M3. 3 is a diagram showing an example of a radiation pattern of the antenna device 100. FIG. It is a figure showing an example of the radiation pattern of antenna device 100M1. FIG. 7 is a diagram collectively showing an example of simulation results in a third modification. It is a figure showing an example of composition of antenna device 100M4 of the 4th modification of an embodiment.
  • the direction parallel to the X axis (X direction), the direction parallel to the Y axis (Y direction), and the direction parallel to the Z axis (Z direction) are orthogonal to each other.
  • the ⁇ Z direction side may be referred to as the lower side or lower side
  • the +Z direction side may be referred to as the upper side or upper side.
  • planar view refers to viewing in the XY plane.
  • a counterclockwise angle with respect to the X direction or Y direction in plan view will be described as a positive angle.
  • radio wave is a type of electromagnetic wave, and generally, electromagnetic waves of 3 THz or less are called radio waves.
  • electromagnetic waves emitted from outdoor base stations or relay stations will be referred to as “radio waves,” and when referring to electromagnetic waves in general, they will be referred to as “electromagnetic waves.”
  • millimeter wave or millimeter wave band includes not only the frequency band of 30 GHz to 300 GHz, but also the quasi-millimeter wave band of 24 GHz to 30 GHz.
  • the radio waves transmitted or received by the antenna device of the embodiment are preferably radio waves in a millimeter wave band such as a fifth generation mobile communication system (5G) or a frequency band of 1 GHz to 30 GHz including Sub-6. Further, the radio waves transmitted or received by the antenna device of the embodiment may be LTE (Long Term Evolution), LTE-A (LTE-Advanced), or UMB (Ultra Mobile Broadband).
  • 5G fifth generation mobile communication system
  • the radio waves transmitted or received by the antenna device of the embodiment may be LTE (Long Term Evolution), LTE-A (LTE-Advanced), or UMB (Ultra Mobile Broadband).
  • the radio waves transmitted or received by the antenna device of the embodiment include IEEE802.11 (Wi-Fi (registered trademark)), IEEE802.16 (WiMAX (registered trademark)), IEEE802.20, UWB (Ultra-Wideband), It may be Bluetooth (registered trademark), LPWA (Low Power Wide Area), or the like.
  • IEEE802.11 Wi-Fi (registered trademark)
  • IEEE802.16 WiMAX (registered trademark)
  • IEEE802.20 UWB (Ultra-Wideband)
  • UWB Ultra-Wideband
  • It may be Bluetooth (registered trademark)
  • LPWA Low Power Wide Area
  • FIG. 1 is a diagram showing an antenna device 100 according to an embodiment.
  • Antenna device 100 includes a substrate 101, a metal layer 110, and a loop slot antenna 120.
  • the antenna device 100 is a dual-polarization type antenna device that can radiate two types of radio waves with polarization directions different by 90 degrees by feeding power at two feeding points FP1 and FP2.
  • the substrate 101 is, for example, a rectangular substrate in plan view.
  • the substrate 101 is, for example, a flexible resin-made thin film-like flexible substrate, or a non-flexible rigid substrate. Flexibility is the property of an object to bend without breaking, as can be seen from its appearance.
  • a flexible substrate for example, fluororesin, COP (Cyclo-Olefin Polymer), PET (Polyethylene terephthalate), PEN (Polyethylene Naphthalate), polyimide, Peek (Polyether ether Ketone), LCP (Liquid Crystal Polymer) is used. ), other composite materials, and other flexible resin materials.
  • COP Cyclo-Olefin Polymer
  • PET Polyethylene terephthalate
  • PEN Polyethylene Naphthalate
  • polyimide Polyimide
  • Peek Polyether ether Ketone
  • LCP Liquid Crystal Polymer
  • other composite materials for example, a substrate made of a prepreg made of glass cloth impregnated with an epoxy resin or the like and
  • the substrate 101 may be formed of any material that is transparent to radio waves emitted from an outdoor base station or the like.
  • Transparent means that the transmittance is at least 40% or more, preferably 60% or more, more preferably 70% or more, and still more preferably 80% or more.
  • a transparent resin base material is used for the substrate 101.
  • acrylic resin such as polymethyl methacrylate, COP, polycarbonate resin, PET, etc. can be used.
  • the substrate 101 may be a glass plate.
  • the metal layer 110 is provided on the upper surface of the substrate 101, for example, and is made of a thin conductor having a regular octagonal shape in plan view. Metal layer 110 is held at ground potential.
  • a square loop slot antenna 120 is formed in the center of the metal layer 110, and has four linear portions extending in directions of ⁇ 45 degrees with respect to the X and Y directions in plan view.
  • Four sides 111A of the outer edges (eight sides) of the metal layer 110 in plan view are sides that are not parallel to the four linear portions of the loop slot antenna 120.
  • Four sides 111B of the outer edge (eight sides) of the metal layer 110 in plan view are sides parallel to two of the four linear parts of the loop slot antenna 120.
  • the four sides 111A are parallel to the X direction or the Y direction, and the four sides 111B are not parallel to the X direction or the Y direction. Although details will be described later, sides 111B parallel to two of the four linear portions of loop slot antenna 120 are provided to reduce cross components.
  • the sides parallel to two of the four linear parts of the loop slot antenna 120 will be referred to as the sides parallel to the loop slot antenna 120. It is called a side.
  • the regular octagonal shape of the metal layer 110 can be taken as a shape obtained by removing the four corners of a square conductor shown by broken lines. Two of the four sides of the square conductor indicated by broken lines are parallel to the X direction, and the remaining two are parallel to the Y direction.
  • the center of the metal layer 110 in plan view coincides with the center C of the loop slot antenna 120 in plan view.
  • the metal layer 110 has a shape that is rotationally symmetrical about the center C of the loop slot antenna 120 in plan view. Further, the metal layer 110 passes through the center C of the loop slot antenna 120 in a plan view and extends in a straight line extending in the X direction, a straight line extending in the Y direction, and in a direction at an angle of ⁇ 45 degrees with respect to the X direction. It has a line-symmetrical shape with the existing straight line as the axis of symmetry.
  • the regular octagonal shape of the outer edge of the metal layer 110 is an example of a convex polygonal shape.
  • the outer edge of the metal layer 110 is a regular octagon; however, the metal layer 110 may have a convex polygonal shape in which the outer edge has three or more sides. Further, it is preferable that the outer edge of the metal layer 110 has four or more sections parallel to the loop slot antenna 120.
  • the outer edge of the metal layer 110 may have a non-convex polygonal shape.
  • a non-convex polygon is synonymous with a concave polygon.
  • the metal layer 110 is divided by the loop slot antenna 120 into a metal part 110IN inside the loop slot antenna 120 and a metal part 110OUT outside the loop slot antenna 120. Both metal portion 110IN and metal portion 110OUT are held at ground potential. Due to constraints such as the size of the casing that houses the antenna device 100, the metal layer 110 is smaller than the size of a general metal layer in which the loop slot antenna 120 would be formed if there were no constraints such as the size of the casing. As an example, when the area of the entire metal layer 110 in plan view is Sg, and the area inside the area surrounded by the loop slot antenna 120 (the area of the metal part 110IN) of the area Sg of the metal layer 110 is Si, 1 ⁇ Sg/Si ⁇ 30.
  • the size (for example, the length of one side) of a conventional general metal layer is set to be sufficiently large with respect to the wavelength ⁇ at the resonant frequency of the loop slot antenna 120.
  • the length of one side of the metal layer is set to 2 ⁇ or more.
  • the loop length (the length of the four linear portions) of the loop slot antenna 120 is set, for example, to the electrical length ⁇ e of the wavelength at the resonant frequency of the loop slot antenna 120.
  • the metal layer 110 can be made of a metal thin film such as copper, nickel, or gold, for example.
  • the metal layer 110 may be made of, for example, zinc oxide (ZnO), tin oxide (SnO 2 ), tin-doped indium oxide (ITO), It is formed of a transparent conductive film such as indium oxide/tin oxide (IZO), a metal nitride such as titanium nitride (TiN) or chromium nitride (CrN), or a low-e film for low emissivity glass. is desirable.
  • the metal layer 110 may be made of a mesh-like metal thin film such as copper, nickel, or gold. .
  • the loop slot antenna 120 is, for example, a loop-shaped slot antenna that is square in plan view.
  • FIG. 1 shows a center C of the loop slot antenna 120 in a plan view.
  • the loop slot antenna 120 has, for example, a configuration in which four linear slots having an angle of 45 degrees with respect to the X direction and the Y direction are connected in a loop shape.
  • the loop length (the length of the four linear portions) of the loop slot antenna 120 is set, for example, to the electrical length ⁇ e of the wavelength at the resonant frequency of the loop slot antenna 120.
  • a configuration in which the resonant frequency of the loop slot antenna 120 is 3.85 GHz will be described.
  • the loop slot antenna 120 has two feeding points FP1 and FP2.
  • the feeding point FP1 is located, for example, on the outside of the loop slot antenna 120 (on the metal part 110 OUT side) at the center of the length of the linear portion located on the +X direction side and the +Y direction side of the center C.
  • the feeding point FP2 is located, for example, on the outside of the loop slot antenna 120 (on the metal part 110 OUT side) at the center of the length of the linear portion located on the +X direction side and the -Y direction side of the center C.
  • the feeding points FP1 and FP2 may be located inside the loop slot antenna 120 (on the metal part 110IN side). Further, the feeding points FP1 and FP2 may be located at symmetrical positions with respect to the center C.
  • the feeding point FP1 is located outside the loop slot antenna 120 (metal part 110 OUT side), for example, at the center of the length of the linear portion located on the ⁇ X direction side and ⁇ Y direction side of the center C. It's okay. Further, the feed point FP2 may be located on the outside of the loop slot antenna 120 (metal part 110 OUT side) at the center of the length of the linear portion located on the -X direction side and +Y direction side of the center C. .
  • the power supply points FP1 and FP2 are supplied with power from a power source (not shown), for example, through wiring or the like provided on the lower surface of the metal layer 110 to be insulated from the metal layer 110.
  • a power source for example, through wiring or the like provided on the lower surface of the metal layer 110 to be insulated from the metal layer 110.
  • Such wiring constitutes, for example, a microstrip line (MSL) using the metal layer 110 as a ground layer.
  • power may be supplied from a power source by connecting core wires of a coaxial cable to the power feeding points FP1 and FP2 and connecting a shield wire of the coaxial cable to the metal layer 110.
  • power may be supplied using a coplanar waveguide (CPW).
  • CPW coplanar waveguide
  • the loop slot antenna 120 When the loop slot antenna 120 is fed with power at the feed point FP1, an electric field is excited in the directions shown by the two double-headed arrows A1 in FIG. 1, and it emits radio waves having a polarization direction in the direction of the double-headed arrows A1. Further, when the loop slot antenna 120 is fed with power at the feeding point FP2, an electric field is excited in the directions shown by the two double-headed arrows A2 in FIG. 1, and radio waves having a polarization direction in the direction of the double-headed arrows A2 are radiated. By simultaneously feeding power at feeding points FP1 and FP2, the loop slot antenna 120 excites an electric field in the directions indicated by double arrows A1 and A2 in FIG. Emit different types of radio waves.
  • the polarization directions of the two radio waves differ by 90 degrees in plan view.
  • the loop slot antenna 120 is not limited to a square shape in a plan view, but may have a polygonal shape such as an octagon or a dodecagon, since it is sufficient that the loop slot antenna 120 can radiate two radio waves whose polarization directions differ by 90 degrees in a plan view. There may be.
  • a cross-component polarized wave whose polarization direction differs by 90 degrees from the main component polarized wave indicated by the double-headed arrow A1 in plan view is generated.
  • the direction of polarization of the main component is the direction of the double arrow A1
  • the direction of the polarization of the cross component is the direction of the double arrow A2.
  • a cross-component polarized wave whose polarization direction differs by 90 degrees from the main component polarized wave indicated by the double-headed arrow A2 in plan view is generated.
  • the direction of polarization of the main component is the direction of the double arrow A2
  • the direction of the polarization of the cross component is the direction of the double arrow A1.
  • the antenna device 100 is provided with a side 111B parallel to the loop slot antenna 120 in order to reduce polarization of cross components.
  • a comparative antenna device 10 that does not include the side 111B parallel to the loop slot antenna 120 will be described using FIG. 2.
  • FIG. 2 is a diagram showing an example of the antenna device 10 for comparison.
  • the antenna device 10 for comparison has a configuration in which a loop slot antenna 12 is provided on a metal layer 11 that is arranged on the upper surface of a substrate 101 and has a rectangular shape in plan view.
  • Loop slot antenna 12 has the same configuration as loop slot antenna 120 shown in FIG. That is, the comparative antenna device 10 has a configuration in which the metal layer 110 of the antenna device 100 shown in FIG. 1 is replaced with a rectangular metal layer 11. All four sides 11A of the metal layer 11 are not parallel to the four linear slots of the loop slot antenna 120, but are parallel to the X direction or the Y direction.
  • the four sides 11A of the metal layer 11 have an angle of 45 degrees with respect to the four linear slots of the loop slot antenna 120 in plan view. Therefore, as an example, when power is supplied at the power supply point FP2, the current due to the polarization of the main component indicated by the broken double-headed arrow A2 propagates through the metal layer 11, and is connected to the side 11A on the -Y direction side and the side 11A on the +Y direction side. It is reflected, and a cross-component polarized wave (dotted double-headed arrow B2) is generated whose polarization direction is 90 degrees different from the main component in plan view.
  • Such cross components have the same polarization direction as the main component of the polarization obtained by feeding at the feeding point FP1, resulting in a decrease in the degree of discrimination between two types of radio waves whose polarization directions differ by 90 degrees. Therefore, it is desirable to reduce it.
  • FIG. 3 is a diagram showing the polarization direction of the main component and the polarization direction of the cross component of the radio waves radiated when power is fed to the feed point FP2 of the loop slot antenna 120.
  • the polarization direction of the main component is shown by a dashed double-headed arrow A2
  • the polarization direction of a cross component whose polarization direction differs by 90 degrees from the main component in plan view is shown by a broken double-headed arrow B2.
  • the current due to the polarization of the main component propagates through the metal layer 110 and is reflected at the side 111B parallel to the loop slot antenna 120, thereby suppressing reflection in a direction 90 degrees different from the main component in plan view. Therefore, compared to FIG. 2, cross-component polarization is less likely to occur.
  • FIGS. 4A and 4B are diagrams showing a simulation model 10A of the antenna device 10 for comparison.
  • the simulation model 10A for comparison includes a housing 130 and a reflector 140 in addition to the substrate 101, metal layer 11, and loop slot antenna 12 included in the antenna device 10 for comparison. Note that in the comparative simulation model 10A, the metal layer 11 is provided on the lower surface of the substrate 101.
  • the housing 130 is provided below the substrate 101, and is made of resin, for example. Further, the reflection plate 140 is provided above the metal layer 11 and is made of metal. The reflector 140 reflects downward the radio waves radiated upward from the loop slot antenna 12. In the comparison simulation model 10A, the radio waves radiated from the loop slot antenna 12 are transmitted through the housing 130 and radiated to the outside of the housing 130. Note that the distance between the metal layer 11 and the reflection plate 140 in the Z direction is set, for example, to 1/4 ( ⁇ e/4) of the electrical length ⁇ e of the wavelength at the communication frequency of the antenna device 10 for comparison.
  • the width of the metal layer 11 in the X direction is 50 mm
  • the length of the metal layer 11 in the Y direction is GND_L
  • the width of the substrate 101 and the reflection plate 140 in the X direction is 100 mm
  • the width of the metal layer 11 in the Y direction is 100 mm.
  • a simulation was performed using an electromagnetic field simulator with the length set to 160 mm.
  • the substrate 101 and the reflection plate 140 are aligned in plan view.
  • the length of one side of the inner circumference of the loop slot antenna 120 was 18.3 mm
  • the slot width was 1.5 mm.
  • FIGS. 5A and 5B are diagrams showing radiation patterns of a simulation model 10A for comparison.
  • FIG. 5A shows a radiation pattern (distribution of operating gain (dBi)) of the 3.85 GHz principal component and cross component in a plane parallel to the YZ plane passing through the center of the loop slot antenna 12.
  • the center of loop slot antenna 12 is the same as the center of loop slot antenna 120 shown in FIG.
  • 0 degrees corresponds to the +Z direction
  • 90 degrees corresponds to the +Y direction
  • -90 degrees corresponds to the -Y direction
  • -180 degrees corresponds to the -Z direction.
  • FIG. 5B shows the radiation pattern of the 3.85 GHz main component and cross component in a plane parallel to the XZ plane passing through the center of the loop slot antenna 12.
  • 0 degrees corresponds to the +Z direction
  • 90 degrees corresponds to the +X direction
  • -90 degrees corresponds to the -X direction
  • -180 degrees corresponds to the -Z direction.
  • the solid line shows the radiation pattern of the main component when GND_L is 80 mm
  • the dashed-dotted line shows the radiation pattern of the main component when GND_L is 75 mm
  • the broken line shows the radiation pattern of the cross component when GND_L is 80 mm
  • the dashed-two dotted line shows the radiation pattern of the cross component when GND_L is 75 mm.
  • FIG. 6 is a diagram showing a simulation model 100A of the antenna device 100.
  • Simulation model 100A includes a housing 130 and a reflector 140 in addition to substrate 101, metal layer 110, and loop slot antenna 120 included in antenna device 100. Note that in the simulation model 100A, the metal layer 110 is provided on the lower surface of the substrate 101.
  • the housing 130 and the reflective plate 140 are the same as the housing 130 and the reflective plate 140 shown in FIGS. 4A and 4B.
  • the metal layer 110 has two sides 111B parallel to the loop slot antenna 120, at a corner on the +Y direction side on the +X direction side and at a corner on the -Y direction side on the +X direction side. No side 111B is provided at the corner of the metal layer 110 on the +Y direction side on the -X direction side and the corner on the -Y direction side on the -X direction side.
  • the width of the metal layer 110 in the X direction was set to 50 mm, and the length of the metal layer 110 in the Y direction was set to 80 mm. Further, the length in the X direction and the Y direction when cutting out the corner of the metal layer 110 to provide the side 111B was set as GND_Cut. Since the side 111B has an angle of 45 degrees with respect to the X direction and the Y direction, the length GND_Cut is equal in the X direction and the Y direction. Further, the width of the substrate 101 and the reflection plate 140 in the X direction was set to 100 mm, and the length in the Y direction was set to 160 mm.
  • the substrate 101 and the reflecting plate 140 are aligned in plan view.
  • FIGS. 7A and 7B are diagrams showing radiation patterns of the simulation model 100A.
  • FIG. 7A shows the radiation pattern (distribution of operating gain (dBi)) of the 3.85 GHz principal component and cross component in a plane parallel to the YZ plane passing through the center C of the loop slot antenna 120 (see FIG. 1). .
  • 0 degrees corresponds to the +Z direction
  • 90 degrees corresponds to the +Y direction
  • -90 degrees corresponds to the -Y direction
  • -180 degrees corresponds to the -Z direction.
  • FIG. 7B shows the radiation pattern of the 3.85 GHz principal component and cross component in a plane parallel to the XZ plane passing through the center C of the loop slot antenna 120 (see FIG. 1).
  • 0 degrees corresponds to the +Z direction
  • 90 degrees corresponds to the +X direction
  • -90 degrees corresponds to the -X direction
  • -180 degrees corresponds to the -Z direction.
  • the solid line shows the radiation pattern of the main component when GND_Cut is 0 mm
  • the dashed line shows the radiation pattern of the main component when GND_Cut is 10 mm
  • the broken line shows the radiation pattern of the cross component when GND_Cut is 0 mm
  • the two-dot chain line shows the radiation pattern of the cross component when GND_Cut is 10 mm.
  • the main component radiation pattern (solid line) when GND_Cut is 0 mm and the cross component radiation pattern ( (dashed line) is equivalent to the radiation pattern of the main component (solid line) and the radiation pattern of the cross component (dashed line) when GND_L is 80 mm shown in FIGS. 5A and 5B, respectively.
  • the radiation pattern of the main component when GND_Cut is 10 mm (dotted chain line) and the radiation pattern of the main component when GND_Cut is 0 mm are shown.
  • the results obtained were that the radiation patterns (solid lines) were approximately equal, and the distribution of operating gains was approximately equal.
  • the cross-component radiation pattern (dashed line) when GND_Cut is 10 mm has a lower operating gain than the cross-component radiation pattern (dashed line) when GND_Cut is 0 mm.
  • the radiation pattern of the main component remains at the same level as when the two sides 111B are not provided (when GND_Cut is 0 mm).
  • the cross component was found to be reduced. This indicates that the cross component can be reduced by providing the side 111B.
  • ⁇ Simulation model 100B and simulation results (part 2) of antenna device 100 of embodiment> 8A and 8B are diagrams showing a simulation model 100B of the antenna device 100.
  • Simulation model 100B includes a housing 130 and a reflector 140 in addition to substrate 101, metal layer 110, and loop slot antenna 120 included in antenna device 100. Note that in the simulation model 100B, the metal layer 110 is provided on the lower surface of the substrate 101.
  • the housing 130 and the reflective plate 140 are the same as the housing 130 and the reflective plate 140 shown in FIGS. 4A and 4B.
  • the metal layer 110 has a regular octagonal outer edge in plan view.
  • the width of the metal layer 110 in the X direction is 64.67 mm
  • the length of the metal layer 110 in the Y direction is 64.67 mm
  • the distance from the center C to the side 111A and The distance to the boundary of 111B was set to 35 mm.
  • the distance D between the loop slot antenna 120 and the side 111B of the outer edge of the metal layer 110 in a plan view that is parallel to the loop slot antenna 120 is set to 21.7 mm, as an example.
  • the width of the substrate 101 and the reflection plate 140 in the X direction was set to 100 mm, and the length in the Y direction was set to 160 mm. Note that the substrate 101 and the reflecting plate 140 are aligned in plan view.
  • the length of one side of the inner circumference of the loop slot antenna 120 was 18.3 mm, and the slot width was 1.5 mm. Therefore, Sg/Si was approximately 12.
  • the distance D between the loop slot antenna 120 and the side 111B of the outer edge of the metal layer 110 in plan view that is parallel to the loop slot antenna 120 satisfies ⁇ e/4 ⁇ D ⁇ e.
  • ⁇ e is the electrical length of the wavelength at the resonant frequency of the loop slot antenna 120.
  • the distance D is approximately 0.28 ⁇ e, as an example.
  • FIG. 9A and 9B are diagrams showing radiation patterns of the simulation model 100B.
  • FIG. 9A shows the radiation pattern (distribution of operating gain (dBi)) of the 3.85 GHz principal component and cross component in a plane parallel to the YZ plane passing through the center C of the loop slot antenna 120 (see FIG. 1). .
  • 0 degrees corresponds to the +Z direction
  • 90 degrees corresponds to the +Y direction
  • -90 degrees corresponds to the -Y direction
  • -180 degrees corresponds to the -Z direction.
  • FIG. 9B shows the radiation pattern of the 3.85 GHz main component and cross component in a plane parallel to the XZ plane passing through the center C of the loop slot antenna 120 (see FIG. 1).
  • 0 degrees corresponds to the +Z direction
  • 90 degrees corresponds to the +X direction
  • -90 degrees corresponds to the -X direction
  • -180 degrees corresponds to the -Z direction.
  • the solid line indicates the radiation pattern of the main component
  • the broken line indicates the radiation pattern of the cross component.
  • the radiation pattern (solid line) of the principal component of the simulation model 100B changes from about -150 degrees to -180 degrees to about +150 degrees.
  • the operating gain was larger than the radiation pattern of the principal component of the simulation model 100A (see FIG. 7A) in the range up to 100°.
  • the radiation pattern of the cross components of the simulation model 100B is the radiation pattern of the cross components of the simulation model 100A (see FIG. 7A) in the YZ plane passing through the center C of the loop slot antenna 120. It was found that the operating gain was lower than that of the previous model, especially in the direction around -180 degrees. As shown in FIG. 9B, this tendency is also the same in a plane parallel to the XZ plane passing through the center C of the loop slot antenna 120, and the radiation pattern (dashed line) of the cross component of the simulation model 100B is different from that of the simulation model 100A. It was found that the operating gain was reduced compared to the radiation pattern (see FIG. 7B), particularly in the direction around -180 degrees.
  • ⁇ Simulation model 100C of antenna device 100 of embodiment and simulation results (part 3)> 10A and 10B are diagrams showing a simulation model 100C of the antenna device 100.
  • the simulation model 100C has a configuration in which the width of the metal layer 110 in the X direction of the simulation model 100B shown in FIGS. 8A and 8B is narrowed. The rest is the same as the simulation model 100B shown in FIGS. 8A and 8B.
  • the width of the metal layer 110 in the X direction is 44.67 mm. Sg/Si was about 8.
  • FIGS. 11A and 11B are diagrams showing radiation patterns of the simulation model 100C.
  • FIG. 11A shows the radiation pattern (distribution of operating gain (dBi)) of the 3.85 GHz principal component and cross component in a plane parallel to the YZ plane passing through the center C of the loop slot antenna 120 (see FIG. 1). .
  • 0 degrees corresponds to the +Z direction
  • 90 degrees corresponds to the +Y direction
  • -90 degrees corresponds to the -Y direction
  • -180 degrees corresponds to the -Z direction.
  • FIG. 11B shows the radiation pattern of the 3.85 GHz principal component and cross component in a plane parallel to the XZ plane passing through the center C of the loop slot antenna 120 (see FIG. 1).
  • 0 degrees corresponds to the +Z direction
  • 90 degrees corresponds to the +X direction
  • -90 degrees corresponds to the -X direction
  • -180 degrees corresponds to the -Z direction.
  • the solid line indicates the radiation pattern of the main component
  • the broken line indicates the radiation pattern of the cross component.
  • the radiation pattern (solid line) of the principal component of the simulation model 100C changes from about -150 degrees to -180 degrees to about +150 degrees.
  • the operating gain was larger than the radiation pattern of the principal component of the simulation model 100A (see FIG. 7A) in the range up to 100 degrees, but the operating gain was smaller than the radiation pattern of the principal component of the simulation model 100B (see FIG. 9A).
  • FIG. 11A in a plane parallel to the YZ plane passing through the center C of the loop slot antenna 120.
  • the radiation pattern (dashed line) of the cross components of the simulation model 100C is the radiation pattern (dashed line) of the cross components of the simulation model 100A on a plane parallel to the YZ plane passing through the center C of the loop slot antenna 120.
  • the operating gain was lower than that of the cross-component radiation pattern of simulation model 100B (see FIG. 9A).
  • this tendency is the same in a plane parallel to the XZ plane passing through the center C of the loop slot antenna 120, and the radiation pattern (dashed line) of the cross component of the simulation model 100C is different from that of the simulation model 100A.
  • the operational gain was reduced compared to the cross-component radiation pattern (see FIG. 7B), the operational gain was smaller than the cross-component radiation pattern of simulation model 100B (see FIG. 9B).
  • FIG. 12 is a diagram summarizing the simulation results.
  • FIG. 12 shows the difference between the principal component and cross component in the ⁇ Z direction on a plane parallel to the XZ plane passing through the center C of the loop slot antenna 120 for the simulation models 10A, 100A, 100B, and 100C, and the The difference between the main component and the cross component in the ⁇ Z direction on a plane parallel to the YZ plane passing through the center C, and the beam width in the horizontal direction (X direction) are shown. Note that the simulation results were obtained by feeding power at the feeding point FP1.
  • the difference between the main component and the cross component in the -Z direction on a plane parallel to the XZ plane and in the -Z direction on a plane parallel to the YZ plane was both 10 dB.
  • the difference between the principal component and the cross component in the -Z direction on a plane parallel to the XZ plane and in the -Z direction on a plane parallel to the YZ plane is both 12 dB. It was found that there was an improvement of 2 dB compared to the value in simulation model 10A for comparison.
  • the difference between the main component and the cross component in the -Z direction on a plane parallel to the XZ plane and in the -Z direction on a plane parallel to the YZ plane is both 20 dB, and the comparison It was found that this was improved by 10 dB compared to the value in the simulation model 10A for .
  • the difference between the main component and the cross component in the -Z direction on a plane parallel to the XZ plane and in the -Z direction on a plane parallel to the YZ plane is both 15 dB, and the comparison It was found that this was improved by 5 dB compared to the value in the simulation model 10A.
  • the beam width in the horizontal direction was narrowed to 88 degrees, 77 degrees, and 83 degrees in the simulation models 100A, 100B, and 100C of the embodiment, compared to 95 degrees in the comparison simulation model 10A. .
  • the simulation models 100A, 100B, and 100C of the embodiment have a slightly narrower beam width in the horizontal direction than the comparison simulation model 10A, but the cross component can be reduced. Ta. Further, among the simulation models 100A, 100B, and 100C of the embodiment, the result of the simulation model 100B including the regular octagonal metal layer 110 is the best, and the width in the X direction of the metal layer 110 of the simulation model 100B is narrowed. The simulation model 100C obtained the second best result. Among the simulation models 100A, 100B, and 100C of the embodiment, the simulation model 100A having two sides 111B parallel to the loop slot antenna 120 had the widest beam width in the horizontal direction.
  • the antenna device 100 includes the metal layer 110 that is polygonal in plan view, and the loop-shaped loop slot antenna 120 that is formed in the metal layer 110 and is polygonal in plan view. 1 ⁇ Sg/Si ⁇ 30, where Sg is the area of the metal layer 110 in plan view, and Si is the area inside the area surrounded by the loop slot antenna 120 out of the area Sg of the metal layer 110. Further, the outer edge of the metal layer 110 in plan view has a side 111B parallel to the loop slot antenna 120 and a side 111A not parallel to the loop slot antenna 120.
  • Sg/Si is preferably 20 or less, more preferably 15 or less, and particularly preferably 10 or less.
  • the metal layer 110 has a shape that is rotationally symmetrical or line symmetrical with respect to the center of the loop slot antenna 120 in plan view, it effectively reduces the polarization of cross components in the entire periphery of the loop slot antenna 120. can.
  • the outer edge of the metal layer 110 has a convex polygonal shape, the polarization of the cross component can be uniformly reduced all around the loop slot antenna 120.
  • the distance D between the outer edge of the metal layer 110 in a plan view that is parallel to the loop slot antenna 120 and the loop slot antenna 120 is the electrical length of the wavelength at the resonance frequency of the loop slot antenna 120, which is ⁇ e. Then, since ⁇ e/4 ⁇ D ⁇ e is satisfied, the polarization of the cross component can be reduced more effectively.
  • loop slot antenna 120 is square, feeding power at two feeding points FP1 and FP2 makes it easy to create a dual-polarization type antenna device 100 having two polarized waves with polarization directions different by 90 degrees. Can be provided.
  • the outer edge of the metal layer 110 has four or more sections parallel to the loop slot antenna 120, the polarization of cross components can be reduced in the entire area around the loop slot antenna 120.
  • the outer edge of the metal layer 110 is a polygon of octagon or larger, a configuration in which it is easy to obtain a section parallel to the loop slot antenna 120 can be realized, and the polarization of cross components can be effectively reduced.
  • the resonant frequency of the loop slot antenna 120 is in the Sub-6 band or millimeter wave band, it is possible to reduce the size of the metal layer 110 and reduce cross component while supporting communication in the Sub-6 band or millimeter wave band. It is possible to provide a dual-polarized antenna device 100 that is capable of reducing polarized waves at the same time.
  • FIG. 13 shows a state in which the substrate 101 and the metal layer 110 are curved.
  • FIG. 13 is a diagram showing a state in which the substrate 101 and the metal layer 110 are curved.
  • the substrate 101 is a flexible substrate
  • the substrate 101 and the metal layer 110 can be curved to match the curved surface B1 of the object B shown by the broken line.
  • the housing 130 and the reflecting plate 140 may also have a curved shape.
  • the object B may be any object as long as it has a curved surface B1, and may be a cylindrical object, for example. If the reflector 140 is provided between the metal layer 110 and the object B, the radio waves radiated by the loop slot antenna 120 can be radiated in the opposite direction to the object B.
  • the metal layer 110 since the metal layer 110 is curved, it can be provided along a curved surface such as the curved surface B1 of the object B.
  • FIG. 14 is a diagram showing an antenna device 100M1 according to a first modification of the embodiment.
  • Antenna device 100M1 includes a substrate 101, a metal layer 110M1, and a loop slot antenna 120.
  • the antenna device 100M1 has a configuration in which the metal layer 110 of the antenna device 100 shown in FIG. 1 is replaced with a metal layer 110M1.
  • the metal layer 110M1 has an octagonal first portion 111M1 and a second portion 111M2 extending in the X direction on the ⁇ X direction side of the first portion 111M1.
  • the first portion 111M1 is an octagonal portion (an example of a convex polygonal shape) surrounded by a broken line square A.
  • the second portion 111M2 has a loop in a portion corresponding to a side of the octagonal shape of the first portion 111M1 that is not parallel to the loop slot antenna 120 (a side extending in the Y direction on the ⁇ X direction side of the first portion 111M1). This is a portion extending in the direction away from the slot antenna 120 ( ⁇ X direction).
  • the octagonal first portion 111M1 of the metal layer 110M1 is the same as the regular octagonal metal layer 110 shown in FIG.
  • the dimension in the Y direction is shorter than the dimension in the X direction.
  • a portion of the outer edge of the metal layer 110M1 to which the second portion 111M2 is not connected has two sides 111A that are not parallel to the loop slot antenna 120 and four sides 111B that are parallel to the loop slot antenna 120. Therefore, the metal layer 110M1 has a configuration in which the second portion 111M2 is connected to two sides 111A parallel to the loop slot antenna 120 on the ⁇ X direction side of the metal layer 110 in FIG.
  • GND_W is the width between the ⁇ X direction end of the second portion 111M2 of the metal layer 110M1 on the ⁇ X direction side and the +X direction end of the second portion 111M2 of the metal layer 110M1 on the +X direction side.
  • GND_L is the length of the metal layer 110M1 in the Y direction.
  • GND_Cut is the length in the X direction and the Y direction when cutting out the corner of the metal layer 110M1 to provide the side 111B.
  • W1 is the width (length of one side) of a portion of the metal layer 110M1 inside the loop slot antenna 120 (a portion corresponding to the metal portion 110IN in FIG. 1).
  • W2 is the width of the slot of the loop slot antenna 120.
  • Pos is the amount of offset of the feed points FP1 and FP2 from the outer edge of the loop slot antenna 120.
  • ExG is the length of the second portion 111M2 in the X direction.
  • FIGS. 15A and 15B are diagrams showing the radiation pattern of the antenna device 100M1.
  • FIG. 15A shows the radiation pattern (distribution of operating gain (dBi)) of the 3.85 GHz principal component and cross component in a plane parallel to the YZ plane passing through the center C of the loop slot antenna 120 (see FIG. 1). .
  • 0 degrees corresponds to the +Z direction
  • 90 degrees corresponds to the +Y direction
  • -90 degrees corresponds to the -Y direction
  • -180 degrees corresponds to the -Z direction.
  • FIG. 15B shows the radiation pattern of the 3.85 GHz principal component and cross component in a plane parallel to the XZ plane passing through the center C of the loop slot antenna 120 (see FIG. 1).
  • 0 degrees corresponds to the +Z direction
  • 90 degrees corresponds to the +X direction
  • -90 degrees corresponds to the -X direction
  • -180 degrees corresponds to the -Z direction.
  • the solid line indicates the radiation pattern of the main component
  • the broken line indicates the radiation pattern of the cross component.
  • the radiation pattern (solid line) of the main component of the antenna device 100M1 ranges from about -150 degrees to -180 degrees to about +150 degrees. It showed good operating gain in the range up to 100°C. This tendency is the same in a plane parallel to the XZ plane passing through the center C of the loop slot antenna 120, as shown in FIG. 15B, and the radiation pattern (solid line) of the main component of the antenna device 100M1 is approximately -150 degrees.
  • a good operating gain was shown in the range from -180 degrees to approximately +150 degrees.
  • the maximum operating gain was 8.09 dBi.
  • the 3 dB beam width (half width) in the horizontal direction (X direction) was 81.6 degrees
  • the 3 dB beam width (half width) in the vertical direction (Y direction) was 57.6 degrees. It is considered that by providing the second portion 111M2 on the ⁇ X direction side, the beam width in the horizontal direction (X direction) was improved by 3 dB.
  • the radiation pattern (dashed line) of the cross-component of the antenna device 100M1 shows that the operating gain is reduced in the YZ plane passing through the center C of the loop slot antenna 120, especially around -180 degrees. It was found that the operational gain decreases to about 0 dBi in the direction of As shown in FIG. 15B, this tendency is also the same in a plane parallel to the XZ plane passing through the center C of the loop slot antenna 120, and the operating gain of the cross component of the antenna device 100M1 is reduced, especially in the -180 It was found that the operating gain was reduced to about 0 dBi in the front and rear directions. The reason why the cross component is more reduced in the XZ plane shown in FIG.
  • the second portion 111M2 of the metal layer 110M1 is located on the two sides parallel to the loop slot antenna 120 on the ⁇ X direction side of the metal layer 110 in FIG. It has been found that by being attached to the portion corresponding to 111A, the cross component can be effectively reduced and the maximum operating gain of the main component can be improved.
  • the metal layer 110M1 having such a second portion 111M2 has a non-convex polygonal shape.
  • a non-convex polygonal metal layer having a second portion 111M2 extending in the ⁇ X direction from a portion corresponding to two sides 111A parallel to the loop slot antenna 120 on the ⁇ X direction side of the metal layer 110 in FIG. 110M1 it is possible to provide an antenna device 100M1 that can effectively reduce cross components and improve the maximum operating gain of the main component.
  • the second portion 111M2 extends in the ⁇ X direction from the portion corresponding to the two sides 111A parallel to the loop slot antenna 120 on the ⁇ X direction side of the metal layer 110 in FIG.
  • the second portion 111M2 is not limited to such a form, and may be extended in the ⁇ Y direction from a portion corresponding to the two sides 111A parallel to the loop slot antenna 120 on the ⁇ Y direction side of the metal layer 110 in FIG. Good too.
  • both the second portion 111M2 extending in the ⁇ Y direction as described above and the second portion 111M2 extending in the ⁇ X direction shown in FIG. 14 may be provided in the metal layer 110M1.
  • FIG. 16 is a diagram showing a metal layer 110M2 of a second modification of the embodiment.
  • a loop slot antenna 120 is formed in the center of the metal layer 110M2.
  • the length of one side of the inner circumference of the loop slot antenna 120 was 18.3 mm, and the slot width was 1.5 mm.
  • the width of the metal layer 110M2 in the X direction is 100 mm, and the length in the Y direction is 60 mm.
  • the metal layer 110M2 has four sides 111B parallel to the loop slot antenna 120 at the four corners.
  • the length in the X direction and the Y direction when cutting out the corner of the metal layer 110M2 to provide the side 111B was set as GND_Cut.
  • FIG. 17 is a diagram showing the simulation results.
  • An electromagnetic field simulation was performed by setting the length GND_Cut of the side 111B to 0 mm, 10 mm, and 20 mm, and the maximum operating gain of the antenna device including the metal layer 110M2, the 3 dB beam width (half width) in the horizontal direction (X direction), The 3 dB beam width (half width) in the vertical direction (Y direction) and the difference obtained by subtracting the operating gain of the cross component from the operating gain of the main component in the -Z direction were determined. Note that when the length GND_Cut of the side 111B is 0 mm, this corresponds to a case where the metal layer 110M2 does not have the side 111B.
  • the maximum operating gains when the length GND_Cut of the side 111B was set to 0 mm, 10 mm, and 20 mm were 7.8 dBi, 5.9 dBi, and 7.2 dBi, respectively.
  • the maximum operating gain was highest when the length GND_Cut was 0 mm, second highest when the length GND_Cut was 20 mm, and lowest when the length GND_Cut was 10 mm.
  • the 3 dB beam widths in the horizontal direction were 82 degrees, 110 degrees, and 81 degrees, respectively.
  • the 3 dB beam width in the horizontal direction was maximum when the length GND_Cut was 10 mm, and was approximately the same value when the length GND_Cut was 0 mm and 20 mm.
  • the 3 dB beam width in the vertical direction is 60 degrees, 59 degrees, and 59 degrees, respectively, and is approximately the same for any length GND_Cut. It was a value.
  • the difference between the main component and the cross component in the -Z direction is 15 dB or more. I found out that I can get it.
  • FIGS. 18A and 18B are diagrams showing the radiation pattern of the antenna device including the metal layer 110M2.
  • FIG. 18A shows the radiation pattern (distribution of operating gain (dBi)) of the 3.85 GHz principal component and cross component in a plane parallel to the YZ plane passing through the center C of the loop slot antenna 120 (see FIG. 1). .
  • 0 degrees corresponds to the +Z direction
  • 90 degrees corresponds to the +Y direction
  • -90 degrees corresponds to the -Y direction
  • -180 degrees corresponds to the -Z direction.
  • FIG. 18B shows the radiation pattern of the 3.85 GHz main component and cross component in a plane parallel to the XZ plane passing through the center C of the loop slot antenna 120 (see FIG. 1).
  • 0 degrees corresponds to the +Z direction
  • 90 degrees corresponds to the +X direction
  • -90 degrees corresponds to the -X direction
  • -180 degrees corresponds to the -Z direction.
  • the solid line indicates the radiation pattern of the main component
  • the broken line indicates the radiation pattern of the cross component.
  • the radiation pattern (solid line) of the main component in a plane parallel to the YZ plane passing through the center C of the loop slot antenna 120, the radiation pattern (solid line) of the main component is in the range from about -60 degrees to about +45 degrees through 0 degrees. It showed good working gain.
  • the radiation pattern of the main component (solid line) changes from about -45 degrees to about +50 degrees through 0 degrees. It showed good operating gain over the entire range.
  • the radiation pattern (dashed line) of the cross component is less than 0 dBi at all angles on the YZ plane passing through the center C of the loop slot antenna 120, and is particularly reduced in the direction around 0 degrees.
  • This tendency is the same in a plane parallel to the XZ plane passing through the center C of the loop slot antenna 120, as shown in FIG. 18B, and especially in the direction around 0 degrees, the difference between the main component and the cross component is 15 dB. It turns out that you can get more than that.
  • FIG. 18C is a simulation result of a Smith chart showing the impedance characteristics seen from FP1 of the antenna device including the metal layer 110M2.
  • FIG. 18C shows impedance characteristics when the frequency of power fed to the loop slot antenna 120 with a resonant frequency of 3.85 GHz is changed from 3.4 GHz to 4.3 GHz.
  • the solid line represents the impedance characteristic when the length GND_Cut of the side 111B is 0 mm
  • the broken line represents the impedance characteristic when the length GND_Cut of the side 111B is 10 mm
  • the dashed line represents the impedance characteristic when the length GND_Cut of the side 111B is 20 mm. It represents the impedance characteristics in the case of
  • FIG. 18D is a diagram showing an example of the frequency characteristics of the S11 parameter obtained in the antenna device including the metal layer 110M2.
  • the S11 parameters shown in FIG. 18D are the results obtained by calculating the frequency characteristics of impedance by simulation analysis when the length GND_Cut of the side 111B is set to 0 mm, 10 mm, and 20 mm.
  • GND_Cut is 0 mm
  • the band where the S11 parameter is -20 dB or less is about 550 MHz
  • GND_Cut is 10 mm or 20 mm
  • the band where the S11 parameter is -20 dB or less is about 750 MHz. It was found that broadband is possible.
  • FIG. 19 is a diagram showing a metal layer 110M2 of a second modification of the embodiment.
  • the width of the metal layer 110M2 in the X direction is GND_W
  • the length in the Y direction is GND_L.
  • the metal layer 110M2 has four sides 111B parallel to the loop slot antenna 120 at the four corners.
  • the length GND_Cut in the X direction and the Y direction when cutting out the corner of the metal layer 110M2 to provide the side 111B is 20 mm (fixed value).
  • FIGS. 20A and 20B are diagrams showing simulation results of an antenna device including the metal layer 110M2.
  • an electromagnetic field simulation is performed by fixing the length of one side of the outer periphery of the loop slot antenna 120 to 21.25 mm, GND_L to 60 mm, and setting GND_W to 80 mm, 90 mm, and 100 mm. From the maximum operating gain of the included antenna device, the 3 dB beam width (half width) in the horizontal direction (X direction), the 3 dB beam width (half width) in the vertical direction (Y direction), and the operating gain of the main component in the -Z direction. The difference was obtained by subtracting the operational gain of the cross component.
  • the maximum operating gains when GND_W was set to 80 mm, 90 mm, and 100 mm were 8.5 dBi, 8.3 dBi, and 7.2 dBi, respectively.
  • the maximum operating gain was highest when GND_W was 80 mm, second highest when GND_W was 90 mm, and lowest when GND_W was 100 mm.
  • the 3 dB beam widths in the horizontal direction when GND_W was set to 80 mm, 90 mm, and 100 mm were 56 degrees, 60 degrees, and 81 degrees, respectively.
  • the 3 dB beam width in the horizontal direction was maximum when GND_W was 100 mm, and became narrower as it became shorter to 90 mm and 80 mm.
  • the vertical 3 dB beam widths when GND_W is set to 80 mm, 90 mm, and 100 mm are 62 degrees, 61.1 degrees, and 59 degrees, respectively, and are maximum when GND_W is 80 mm, and 90 mm and 100 mm. As it got longer, it became slightly narrower.
  • the differences between the main component and the cross component in the ⁇ Z direction when GND_W was set to 80 mm, 90 mm, and 100 mm were 21 dB, 25 dB, and 22.2 dB, respectively.
  • the difference between the principal component and the cross component in the -Z direction was maximum when GND_W was 90 mm, and was about the same when GND_W was 80 mm and 100 mm, but was a little lower than when GND_W was 90 mm. .
  • the beam width in the horizontal direction can be adjusted by 3 dB while maintaining a sufficient difference (15 dB or more) between the main component and the cross component in the -Z direction.
  • FIG. 20B shows an electromagnetic field simulation with GND_W fixed at 100 mm and GND_L set to 40 mm, 50 mm, and 60 mm, and the maximum operating gain of the antenna device including the metal layer 110M2 is 3 dB in the horizontal direction (X direction).
  • the beam width (half width), the 3 dB beam width (half width) in the vertical direction (Y direction), and the difference obtained by subtracting the operating gain of the cross component from the operating gain of the main component in the -Z direction were determined.
  • the maximum operating gains when GND_L was set to 40 mm, 50 mm, and 60 mm were 7.6 dBi, 7.4 dBi, and 7.2 dBi, respectively.
  • the maximum operating gain was highest when GND_L was 40 mm, and was slightly smaller when GND_L was 50 mm and 60 mm.
  • the 3 dB beam widths in the horizontal direction when GND_L was set to 40 mm, 50 mm, and 60 mm were 60 degrees, 70 degrees, and 81 degrees, respectively.
  • the 3 dB beam width in the horizontal direction was maximum when GND_L was 60 mm, and became narrower as it became shorter to 50 mm and 40 mm.
  • the vertical 3 dB beam widths are 69 degrees, 63 degrees, and 59 degrees, respectively.
  • the maximum is when GND_L is 40 mm, and the widths are as long as 50 mm and 60 mm. It gradually became narrower.
  • the differences between the main component and the cross component in the ⁇ Z direction when GND_L was set to 40 mm, 50 mm, and 60 mm were 7.4 dB, 11.2 dB, and 22.2 dB, respectively.
  • the difference between the main component and the cross component in the -Z direction is maximum when GND_L is 60 mm, becomes approximately half of 11.2 dB when GND_L is 50 mm, and further decreases when GND_L is 40 mm. It was 7.4dB.
  • FIGS. 21A and 21C are Smith charts showing the impedance characteristics of the antenna device including the metal layer 110M2.
  • 21A and 21C show impedance characteristics when the frequency of power fed to the loop slot antenna 120 with a resonant frequency of 3.85 GHz is changed from 3.4 GHz to 4.3 GHz.
  • FIG. 21B and FIG. 21D are diagrams showing an example of the frequency characteristics of the S11 parameter obtained in the antenna device including the metal layer 110M2.
  • the solid line represents the impedance characteristic when GND_W is 80 mm
  • the broken line represents the impedance characteristic when GND_W is 90 mm
  • the dashed line represents the impedance characteristic when GND_W is 100 mm.
  • the S11 parameters shown in FIG. 21B are the results obtained by calculating the frequency characteristics of impedance by simulation analysis when GND_W is set to 80 mm, 90 mm, and 100 mm.
  • GND_W is 80 mm
  • the band where the S11 parameter is -20 dB or less is about 650 MHz
  • GND_W is 90 mm or 100 mm
  • the band where the S11 parameter is -20 dB or less is about 750 MHz. It was found that it is possible to widen the bandwidth by adjusting GND_W.
  • the solid line represents the impedance characteristic when GND_L is 40 mm
  • the broken line represents the impedance characteristic when GND_L is 50 mm
  • the dashed line represents the impedance characteristic when GND_L is 60 mm.
  • FIG. 21D shows the results of frequency characteristics of impedance calculated by simulation analysis when GND_L is set to 40 mm, 50 mm, and 60 mm.
  • GND_L is 40 mm
  • the band where the S11 parameter is -20 dB or less is about 400 MHz
  • the band where the S11 parameter is -20 dB or less is about 620 MHz.
  • GND_L is 60 mm
  • a band in which the S11 parameter is ⁇ 20 dB or less is obtained at about 750 MHz, and it was found that a wide band can be achieved by adjusting GND_L.
  • the antenna device including the metal layer 110M2 of the second modified example of the embodiment effectively suppresses the cross component by including the four sides 111B parallel to the loop slot antenna 120 in the four corners of the metal layer 110M2. It was found that the maximum operating gain of the principal component could be improved.
  • FIG. 22 is a diagram illustrating an example of an antenna device 100M3 according to a third modification of the embodiment.
  • Antenna device 100M3 includes a substrate 101, a metal layer 110M1, a loop slot antenna 120, and a slot 125.
  • the antenna device 100M3 has a configuration in which a slot 125 is added to the second portion 111M2 of the metal layer 110M1 of the antenna device 100M1 of the first modification shown in FIG.
  • the slots 125 are elongated groove-shaped openings provided in each of the two second portions 111M2 of the metal layer 110M1.
  • the antenna device 100M3 can expand the beam width by having the second portion 111M2. Slot 125 is provided to further reduce polarization of cross components.
  • the slot 125 has a first slot part 125A and a second slot part 125B.
  • the length in the extending direction (Slot_L) and the width (Slot_W) in the extending direction of the first slot part 125A and the second slot part 125B are equal to each other.
  • the two slots 125 have, for example, a line-symmetrical shape when viewed from above with respect to a straight line passing through the center C of the loop slot antenna 120 and parallel to the Y-axis as an axis of symmetry.
  • the slot 125 on the +X direction side has an L-shape.
  • the first slot portion 125A of the slot 125 on the +X direction side is located on the +X direction side and the +Y direction side of the four linear portions of the loop slot antenna 120, and is parallel to the linear portion where the feeding point FP1 is located. It extends to
  • the second slot portion 125B of the slot 125 on the +X direction side is located on the ⁇ Y direction side with respect to the first slot portion 125A, and among the four linear portions of the loop slot antenna 120, the second slot portion 125B is on the +X direction side and ⁇ It extends parallel to the linear portion located on the Y direction side.
  • the linear portion parallel to the first slot portion 125A of the slot 125 on the +X direction side is an example of the first side.
  • the linear portion parallel to the second slot portion 125B of the slot 125 on the +X direction side is an example of the second side.
  • the extending direction of the first slot portion 125A and the extending direction of the second slot portion 125B are respectively the +X direction of the four sides 111B of the metal layer 110. It is parallel to the two sides 111B located on the sides.
  • the extending direction of the first slot portion 125A and the extending direction of the second slot portion 125B are orthogonal in plan view.
  • the first slot portion 125A and the second slot portion 125B are slightly in the +X direction with respect to the straight line extending the two sides 111B located on the +X direction side. It is offset to the side. In this way, the first slot portion 125A and the second slot portion 125B may be offset in the +X direction with respect to the straight line extending the two sides 111B, but this reduces the polarization of the cross component. From this point of view, it is most preferable that the first slot portion 125A and the second slot portion 125B are located on a straight line extending the two sides 111B. Further, the first slot portion 125A and the second slot portion 125B may be offset in the -X direction with respect to a straight line extending the two sides 111B.
  • the -Y direction side end of the first slot section 125A and the +Y direction side end of the second slot section 125B are connected, for example, and the first slot section 125A and the second slot section 125B are connected to each other. It is integrated.
  • the slot 125 on the -X direction side has an L-shape.
  • the first slot portion 125A of the slot 125 on the ⁇ X direction side is located on the ⁇ X direction side and the +Y direction side among the four linear portions of the loop slot antenna 120, and is the linear portion where the feeding point FP2 is located. extends parallel to.
  • the second slot portion 125B of the slot 125 on the ⁇ X direction side is located on the ⁇ Y direction side than the first slot portion 125A, and among the four linear portions of the loop slot antenna 120, the second slot portion 125B of the slot 125 on the ⁇ X direction side is located on the ⁇ X direction side. and extends parallel to the linear portion located on the ⁇ Y direction side.
  • the linear portion parallel to the first slot portion 125A of the slot 125 on the ⁇ X direction side is an example of the first side.
  • the linear portion parallel to the second slot portion 125B of the slot 125 on the ⁇ X direction side is an example of the second side.
  • the extending direction of the first slot part 125A and the extending direction of the second slot part 125B are respectively - of the four sides 111B of the metal layer 110. It is parallel to the two sides 111B located on the X direction side.
  • the extending direction of the first slot portion 125A and the extending direction of the second slot portion 125B are orthogonal in plan view.
  • the first slot portion 125A and the second slot portion 125B are slightly - It is offset in the X direction.
  • the first slot part 125A and the second slot part 125B may be offset in the -X direction with respect to the straight line extending the two sides 111B, but the polarization of the cross component is From the viewpoint of reducing the amount, it is most preferable that the first slot portion 125A and the second slot portion 125B are located on a straight line extending the two sides 111B.
  • the first slot portion 125A and the second slot portion 125B may be offset in the +X direction with respect to a straight line extending the two sides 111B.
  • the -Y direction side end of the first slot section 125A and the +Y direction side end of the second slot section 125B are connected, for example, and the first slot section 125A and the second slot section 125B are connected to each other. It is integrated.
  • the two slots 125 are parallel to the four sides of the loop slot antenna 120, in the second portion 111M2, reflection in a direction 90 degrees different from the main component in plan view is suppressed, and the cross component is This is provided to prevent polarization from occurring.
  • the slot 125 may be divided between an end on the ⁇ Y direction side of the first slot portion 125A and an end on the +Y direction side of the second slot portion 125B. Further, the slot 125 may include only one of the first slot portion 125A and the second slot portion 125B. Further, the slot 125 may be provided only in one of the two second portions 111M2.
  • the length of the first slot portion 125A and the second slot portion 125B in the extending direction is Slot_L
  • the width of the first slot portion 125A and the second slot portion 125B is Slot_W
  • the center of the loop slot antenna 120 is SlotPos.
  • SlotPos be the distance between C and the outer edge in the X direction of the connection point of the first slot portion 125A and the second slot portion 125B.
  • the distance SlotPos represents the position of the slot 125 in the X direction with respect to the center C of the loop slot antenna 120.
  • each part of the antenna device 100M3 were set as follows, and the radiation pattern was calculated.
  • Length Slot_L is 18.3mm
  • width Slot_W is 1.8mm
  • distance SlotPos is 50mm
  • GND_W is 120mm
  • GND_L is 60mm
  • GND_Cut is 15mm
  • W1 is 18.3mm
  • W2 is 0.9mm
  • Pos is 2mm
  • ExG is The electromagnetic field simulation was performed by setting the length of the substrate 101 in the X direction to 160 mm, and the length of the substrate 101 in the Y direction to 100 mm. In this case, Sg/Si was approximately 11.1.
  • the antenna device 100 has a configuration in which the slot 125 and the second portion 111M2 are omitted from the antenna device 100M3 in which the dimensions of each part are set as described above.
  • ExG was set to 0 mm.
  • the antenna device 100M1 has a configuration in which the slot 125 is omitted from the antenna device 100M3 in which the dimensions of each part are set as described above.
  • 23A to 23C are diagrams showing examples of radiation patterns of the antenna device 100M3, the antenna device 100, and the antenna device 100M1.
  • 23A to 23C show radiation patterns of the main component and the cross component of 4.1 GHz in a plane parallel to the XZ plane passing through the center C of the loop slot antenna 120 (see FIG. 1).
  • 0 degrees corresponds to the +Z direction
  • 90 degrees corresponds to the -X direction
  • 180 degrees corresponds to the -Z direction
  • 270 degrees corresponds to the +X direction.
  • the solid line indicates the radiation pattern of the main component
  • the broken line indicates the radiation pattern of the cross component.
  • the radiation pattern (solid line) of the main component of the antenna device 100M3 showed a good operating gain in the range from about 120 degrees to about 220 degrees through 180 degrees. The maximum operating gain was 7.43 dBi.
  • the 3 dB beam width (half width) in the horizontal direction (X direction) is 76.9 degrees
  • the difference between the main component and the cross component in the -Z direction (180 degrees) was 12.6 dB.
  • the radiation pattern (solid line) of the main component of the antenna device 100 showed a good operating gain in the range from about 140 degrees to about 20 degrees through 180 degrees.
  • the maximum operating gain was 7.82 dBi.
  • the 3 dB beam width (half width) in the horizontal direction (X direction) was 52.1 degrees
  • the difference (XPD) between the main component and cross component in the -Z direction (180 degrees) was 11.7 dB. .
  • the radiation pattern (solid line) of the main component of the antenna device 100M1 showed a good operating gain in the range from about 130 degrees to about 200 degrees through 180 degrees.
  • the maximum operating gain was 7.71 dBi.
  • the 3 dB beam width (half width) in the horizontal direction (X direction) was 58.8 degrees
  • the difference (XPD) between the main component and cross component in the -Z direction (180 degrees) was 8.4 dB. .
  • FIG. 24 is a diagram collectively illustrating an example of simulation results in the third modification.
  • the antenna device 100M3 has a slightly lower maximum operating gain than the antenna device 100M1 that does not include the slot 125, but the beam width in the horizontal direction is wider and the main component and cross component in the -Z direction (180 degrees) are It was found that the difference (XPD) was greatly improved (4.2 dB).
  • the antenna device 100M3 of the third modified example of the embodiment expands the beam width in the horizontal direction and significantly reduces the cross component by providing the slot 125 in the second portion 111M2 of the metal layer 110M1. It turns out that it is possible to achieve this.
  • the horizontal beam width expansion of the antenna device 100M3 relative to the antenna device 100M1 was definitely larger than the horizontal beam width expansion of the antenna device 100M1 relative to the antenna device 100.
  • the slot 125 provided in the second portion 111M2, it is possible to provide an antenna device 100M3 that can expand the beam width in the horizontal direction and effectively reduce cross components while reducing the size of the metal layer 110M1. .
  • reflection in a direction that is 90 degrees different from the main component in plan view can be more effectively suppressed, thereby making it difficult for cross-component polarization to occur.
  • the antenna devices 100, 100M1, and 100M3 include one loop slot antenna 120
  • the antenna device 100, 100M1, or 100M3 may include a plurality of loop slot antennas 120.
  • FIG. 25 is a diagram illustrating an example of the configuration of an antenna device 100M4 according to a fourth modification of the embodiment.
  • Antenna device 100M4 includes two loop slot antennas 120.
  • the antenna device 100M4 has a configuration in which the metal layer 110M1 of the antenna device 100M3 shown in FIG. 22 is replaced with a metal layer 110M4, and two loop slot antennas 120 are provided on the metal layer 110M4.
  • the metal layer 110M4 has a first portion 111M1 and a second portion 111M2 similarly to the metal layer 110M1.
  • the two loop slot antennas 120 are arranged in the Y direction.
  • the Y direction is a direction in which the second portion 111M2 is not located with respect to the first portion 111M1.
  • the center of centers C1 and C2 is referred to as center CC.
  • the center CC is the center between the centers C1 and C2 of the two loop slot antennas 120.
  • the center CC coincides with the center of the metal layer 110M4 in plan view.
  • the two loop slot antennas 120 are arranged along the direction (Y direction) perpendicular to the direction (X direction) in which the second portion 111M2 extends from the first portion 111M1.
  • the antenna device 100M4 including the two loop slot antennas 120 can expand the beam width in the horizontal direction and significantly reduce cross components by providing the slots 125, similarly to the antenna device 100M3. .
  • the metal layer 110M4 can be made smaller, and the beam width in the horizontal direction can be expanded and the cross component can be effectively reduced. It is possible to provide an antenna device 100M4 that can achieve this reduction.
  • an antenna device 100M4 having a configuration in which the number of loop slot antennas 120 in the antenna device 100M3 shown in FIG. 14) may have two loop slot antennas 120. Further, the number of loop slot antennas 120 in the antenna device 100, 100M1, or 100M3 may be three or more. When there are four or more loop slot antennas 120, they may be arranged in an array.
  • Antenna device 100M1 Antenna device 100M3 Antenna device 100M4 Antenna device 101 Substrate 110 Metal layer 110IN Metal portion 110OUT Metal portion 110M1 Metal layer 110M2 Metal layer 110M4 Metal layer 111A Side 111B Side 111M1 First portion 111M2 Second portion 120 Loop slot antenna 125 slot 125A First slot part 125B Second slot part 130 Housing 140 Reflector

Abstract

La présente invention concerne un dispositif d'antenne à double polarisation pouvant obtenir à la fois une réduction de la taille d'une couche métallique et une réduction d'une polarisation ayant des composants qui se croisent.　Ce dispositif d'antenne comprend une couche métallique qui est polygonale dans une vue en plan, et une antenne à fente en boucle qui est formée sur la couche métallique et est polygonale et en forme de boucle dans la vue en plan. Lorsque la zone de la couche métallique dans la vue en plan est Sg, et, au sein de la zone Sg de la couche métallique, la zone à l'intérieur d'une région entourée par l'antenne à fente en boucle est Si, 1 < Sg/Si ≤ 30. Le bord externe de la couche métallique dans la vue en plan présente un côté qui est parallèle à au moins un côté de l'antenne à fente en boucle, et un côté qui n'est pas parallèle à l'un quelconque des côtés de l'antenne à fente en boucle.
PCT/JP2023/017438 2022-05-16 2023-05-09 Dispositif d'antenne WO2023223893A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2022080102 2022-05-16
JP2022-080102 2022-05-16
JP2022-143957 2022-09-09
JP2022143957 2022-09-09

Publications (1)

Publication Number Publication Date
WO2023223893A1 true WO2023223893A1 (fr) 2023-11-23

Family

ID=88835378

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/017438 WO2023223893A1 (fr) 2022-05-16 2023-05-09 Dispositif d'antenne

Country Status (1)

Country Link
WO (1) WO2023223893A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004007559A (ja) * 2002-04-25 2004-01-08 Matsushita Electric Ind Co Ltd 多共振アンテナ、アンテナモジュールおよび多共振アンテナを用いた無線装置
WO2007122723A1 (fr) * 2006-04-21 2007-11-01 Mitsubishi Denki Kabushiki Kaisha Dispositif d'antenne
JP2010154530A (ja) * 2008-12-23 2010-07-08 Thales 二重偏波平面状放射素子およびそのような放射素子を備えるアレイアンテナ
WO2014080360A2 (fr) * 2012-11-21 2014-05-30 Tagsys Antenne à plaque miniaturisée
US20160118720A1 (en) * 2014-10-23 2016-04-28 Hyundai Motor Company Antenna, circular polarized patch antenna, and vehicle having the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004007559A (ja) * 2002-04-25 2004-01-08 Matsushita Electric Ind Co Ltd 多共振アンテナ、アンテナモジュールおよび多共振アンテナを用いた無線装置
WO2007122723A1 (fr) * 2006-04-21 2007-11-01 Mitsubishi Denki Kabushiki Kaisha Dispositif d'antenne
JP2010154530A (ja) * 2008-12-23 2010-07-08 Thales 二重偏波平面状放射素子およびそのような放射素子を備えるアレイアンテナ
WO2014080360A2 (fr) * 2012-11-21 2014-05-30 Tagsys Antenne à plaque miniaturisée
US20160118720A1 (en) * 2014-10-23 2016-04-28 Hyundai Motor Company Antenna, circular polarized patch antenna, and vehicle having the same

Similar Documents

Publication Publication Date Title
CN108346853B (zh) 天线装置
US7106256B2 (en) Antenna device
US9379432B2 (en) Antenna device, electronic apparatus, and wireless communication method
US8907860B2 (en) Stand-alone multi-band antenna
US20210005951A1 (en) Antenna unit, antenna unit-attached window glass, and matching body
US20120062437A1 (en) Antenna system with planar dipole antennas and electronic apparatus having the same
JP2004328693A (ja) アンテナ及びアンテナ用誘電体基板
CN112771719A (zh) 天线系统
JP7355026B2 (ja) 平面アンテナ及び窓ガラス
JP4170828B2 (ja) アンテナ及びアンテナ用誘電体基板
JP2009065321A (ja) パッチアンテナ
WO2023279852A1 (fr) Unité d&#39;antenne et dispositif électronique
EP3240109B1 (fr) Appareil électronique et son antenne imprimée à double bande
JP2004201265A (ja) 板状逆ｆアンテナ
WO2023223893A1 (fr) Dispositif d&#39;antenne
US20220102841A1 (en) Antenna assembly and electronic device
KR101076233B1 (ko) 변형된 시어핀스키 프랙탈 구조의 이중 대역 안테나
US20210075108A1 (en) Communication device
JP2005203971A (ja) アンテナ装置、アンテナシステム
CN108565548B (zh) 一种毫米波天线
US20190379127A1 (en) Terminal Antenna and Terminal
CN108400436B (zh) 天线模块
CN105762496A (zh) 用于提高天线增益的天线结构
Wongsin et al. High gain multiband circular loop antenna with ring resonators reflectors by using FSS technique
KR200348650Y1 (ko) 야기 안테나 구조를 이용한 고이득 마이크로스트립 안테나

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23807497

Country of ref document: EP

Kind code of ref document: A1