CN109196718B - Antenna device - Google Patents
Antenna device Download PDFInfo
- Publication number
- CN109196718B CN109196718B CN201780033025.3A CN201780033025A CN109196718B CN 109196718 B CN109196718 B CN 109196718B CN 201780033025 A CN201780033025 A CN 201780033025A CN 109196718 B CN109196718 B CN 109196718B
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- Prior art keywords
- side wall
- flat plate
- wall portion
- antenna device
- plate portion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
Abstract
The antenna device is provided with: the radiating element (10) as a conductor part electrically connected with an inner conductor of a coaxial cable and a flat plate part (21) as a flat plate conductor part electrically connected with an outer conductor of the coaxial cable are arranged to face with a specified interval or to stand from the flat plate part, the flat plate part is in line symmetry and has a shape of a width narrowing region which is a part with a length from a certain end part to an end part on the opposite side with a symmetry axis set to be shorter than a half wave of a radio wave of a transmitting and receiving signal, at least one end part of 2 end parts parallel to the symmetry axis forming the width narrowing region is provided with a side wall part (22) as a conductor part along the end part and in a direction without the radiation element when being observed from the flat plate part.
Description
Cross Reference to Related Applications
The present application claims priority to Japanese patent application No. 2016-207044, filed on 2016, 10, 21, the contents of which are incorporated herein by reference.
Technical Field
The present disclosure relates to an antenna device including a chassis that is a flat conductive member connected to an outer conductor of a coaxial cable and supplying a ground potential.
Background
Conventionally, various antenna devices such as a monopole antenna and a patch antenna have been described and developed as an antenna device including a chassis (for example, patent document 1). In the antenna device using the current flowing through the substrate, when the area of the substrate (hereinafter referred to as the substrate area) is insufficient for the wavelength of the radio wave to be transmitted/received, the mirror effect achieved by the substrate becomes insufficient, and the gain in the original radiation direction decreases. In addition, when the area of the bottom plate is insufficient, a current (hereinafter referred to as a leakage current) leaking from the bottom plate to the outer conductor of the coaxial cable may increase, and the gain may be lowered.
In other words, in order to sufficiently stabilize the characteristics of the antenna device, a substrate having an area corresponding to the wavelength of a radio wave to be transmitted/received (hereinafter, referred to as a target radio wave) is required. Therefore, if the area of the chassis is reduced for miniaturization, the characteristics of the antenna device become unstable.
In addition, in an antenna device using a rectangular bottom plate, it is generally known that the length of each 1 side of the bottom plate needs to be set to be equal to or more than half the wavelength of a target radio wave (for example, 0.75 wavelength) in order to sufficiently stabilize the characteristics.
Patent document 1: japanese patent laid-open publication No. 2010-226633
Further miniaturization is desired for the antenna device. Further, there is a demand for disposing other members on the periphery of the bottom plate. On the other hand, if the components are arranged around the bottom plate, the area of the entire antenna device in a plan view (hereinafter referred to as antenna area) naturally increases in accordance with the area required for arranging the additional components. On the other hand, if the area of the chassis is reduced in order to dispose the additional component, the gain of the antenna device is reduced.
Disclosure of Invention
An object of the present disclosure is to provide an antenna device capable of reducing the area of a chassis while suppressing a decrease in gain.
An antenna device according to claim 1 for achieving the object includes: the radiating element is disposed so as to face the flat plate portion at a predetermined interval or is provided so as to stand upright from the flat plate portion, the flat plate portion is formed in line symmetry and has a narrowed width region having a length set to be shorter than a half wave of a radio wave to be transmitted/received from a certain end portion to an end portion on the opposite side of the axis of symmetry, and at least one of 2 end portions parallel to the axis of symmetry where the narrowed width region is formed is provided with a side wall portion as a conductor member along the end portion in a direction in which the radiating element is not present when viewed from the flat plate portion.
In general, when the length of the bottom plate is shorter than a half wavelength, a reverse phase current is generated in the bottom plate, and the gain as an antenna is lowered. On the other hand, in the above configuration, the side wall portion, which is a plate-like conductor member, is provided at the end portion of the width-narrowed region in a direction in which the radiation element does not exist. With this configuration, the current is distributed not only to the flat plate portion but also to the side wall portion. Therefore, the amount of current generated in the reverse phase on the flat plate portion as the bottom plate can be suppressed. As a result, the area of the bottom plate can be reduced while suppressing a decrease in gain.
An antenna device according to claim 2 for achieving the above object includes: the radiation element is arranged to face the flat plate portion at a predetermined interval or to be erected from the flat plate portion, the flat plate portion is shaped to have a 1 st edge portion and a 2 nd edge portion which are linear and face each other, a distance between the 1 st edge portion and the 2 nd edge portion is set to be shorter than a half wavelength of a radio wave to be transmitted and received, and a side wall portion as a conductor member is provided along at least one of the 1 st edge portion and the 2 nd edge portion in a direction in which the radiation element is not present as viewed from the flat plate portion.
The above configuration also reduces the area of the bottom plate while suppressing a decrease in gain by the same action as in the above-described embodiment 1.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. Wherein the content of the first and second substances,
fig. 1 is an overhead perspective view of the antenna device of the present embodiment,
figure 2 is an overhead perspective view of the antenna device,
figure 3 is a cross-sectional view of the antenna device of the line III-III shown in figure 1,
figure 4 is a top view of the antenna device,
fig. 5 is a diagram showing a structure of a general patch antenna,
FIG. 6 is a view for explaining the Y-axis direction length and the Y-axis direction current distribution of the butt floor,
FIG. 7 is a graph showing the simulation result of the relationship between the Y-axis direction length of the ground plate and the gain,
fig. 8 is a diagram for explaining the operation of the antenna device of the present embodiment,
FIG. 9 is a graph showing the results of simulations on the relationship between the height of the side wall portion, the length of the rear surface portion, and the gain,
FIG. 10 is a view showing an effect achieved by providing a side wall portion and a back surface portion,
FIG. 11 is a view showing a modification of the antenna device,
FIG. 12 is a view showing a modified example of the ground pattern,
FIG. 13 is a view showing a modified example of the ground pattern,
FIG. 14 is a view showing a modification of the antenna device,
figure 15 is a rear view of the antenna device shown in figure 14,
FIG. 16 is a view showing a modification of the antenna device,
fig. 17 is a diagram showing a modification of the antenna device.
Detailed Description
[ embodiment ]
Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The antenna device 100 of the present embodiment is configured to transmit and receive circularly polarized waves of a predetermined frequency in a simple manner by the same operation principle as that of a known patch antenna. Of course, the antenna device 100 may be used for only one of transmission and reception.
A radio wave to be transmitted/received (hereinafter, referred to as a target radio wave) may be appropriately designed, and here, a radio wave of 1.575GHz is used as an example. Of course, the target radio wave may be appropriately designed, and other radio waves such as 300MHz, 760MHz, 900MHz, and 5.9GHz may be used. Hereinafter, the frequency of the target radio wave is referred to as a target frequency, and the wavelength of the target radio wave is also referred to as a target wavelength.
The antenna apparatus 100 is connected to a radio device, not shown, via a coaxial cable, for example, and signals received by the antenna apparatus 100 are sequentially output to the radio device. The antenna device 100 converts an electric signal input from a wireless device into an electric wave and radiates the electric wave into a space. The wireless device uses the signal received by the antenna device 100 and supplies high-frequency power corresponding to the transmission signal to the antenna device 100. The antenna device 100 and the radio equipment may be connected via a known matching circuit, a filter circuit, or the like, in addition to the coaxial cable.
Hereinafter, a specific configuration of the antenna device 100 will be described. As shown in fig. 1 to 4, the antenna device 100 includes a patch pattern 10, a ground pattern 20, and a power feeding unit 30. Fig. 1 is a view showing an external appearance when the antenna device 100 is viewed from an oblique upper direction (in other words, a bird's eye view), and fig. 2 is a view showing an external appearance when the antenna device 100 is viewed from an oblique lower direction (in other words, a bird's eye view). The upward direction of the antenna device 100 is a direction from the ground pattern 20 toward the patch pattern 10.
The patch pattern 10 is a plate-like conductor member made of a conductor such as copper. The plate shape here also includes a film shape such as a foil, for example. The patch pattern 10 is disposed so as to face the ground pattern 20 with a support member not shown interposed therebetween. The support member may be realized by using a dielectric such as a resin. The support member may have a plate shape, or may be a plurality of posts that support the ground pattern 20 and the patch pattern 10 so as to face each other with a predetermined gap therebetween.
The patch pattern 10 has a shape in plan view (hereinafter referred to as a planar shape) in which notches 11 are provided at 1 pair of corners of a square. The notch 11 is a structure for radiating a circularly polarized wave, and corresponds to a known degeneracy separator or perturbation element. The area of the portion cut out from the original square by the notch 11 may be determined by a known degenerate separation method. In the present embodiment, the patch pattern 10 is configured to be able to transmit and receive circularly polarized waves by providing the notch 11, but may be configured to be able to transmit and receive circularly polarized waves by providing a feed point at 2 (so-called two-point feed method) as another method.
The length Lp of 1 side of the patch pattern 10 is about half of the target wavelength in electrical terms. The electrical length here is an effective length in consideration of the fringe electric field, the wavelength shortening effect by the dielectric, and the like. If the wavelength of the target radio wave is shortened by a support member not shown, the length may be half the shortened wavelength. The length of 1 side of the patch pattern 10 is the shape in which the notch 11 is omitted, that is, the length of 1 side of the square.
Here, as an example, the electrical length of the target wavelength (hereinafter, λ) is 50mm by virtue of the wavelength shortening effect of the support member. The length Lp of 1 side of the patch pattern 10 is set to a value (for example, 23mm) slightly shorter than 25mm, which is a half wavelength (in other words, λ/2) of the target radio wave, in consideration of the influence of the fringe field or the like.
In the present embodiment, the planar shape of the patch pattern 10 is formed in a square shape provided with the cutout 11, but the invention is not limited thereto. As another configuration, the planar shape of the patch pattern 10 may be a rectangle, or may be a shape other than a rectangle (for example, a circle, an octagon, or the like).
The patch pattern 10 is directly or indirectly connected to the inner conductor of the coaxial cable via the power supply unit 30. The indirectly connected structure includes a structure connected via an impedance matching circuit, a filter circuit, or the like, and a structure connected by electromagnetic coupling. In short, the patch pattern 10 may be electrically connected to the inner conductor of the coaxial cable. The patch pattern 10 corresponds to a radiating element.
For convenience, the following description will be given of the structure of the antenna device 100 by introducing a concept of a three-dimensional coordinate system having X, Y, Z axes orthogonal to each other as appropriate. The X axis is an axis parallel to one side of the patch pattern 10, and the Y axis is an axis orthogonal to the X axis in a plane parallel to the patch pattern 10 including the X axis. The Z axis is an axis orthogonal to the X axis and the Y axis, and the direction from the ground pattern 20 to the patch pattern 10 is a positive direction.
The ground pattern 20 is implemented using a conductor such as copper. The ground pattern 20 is electrically connected to an outer conductor of the coaxial cable, and provides a ground potential (in other words, a ground potential) of the antenna device 100.
The ground pattern 20 includes: a flat plate-like patch facing portion 21 facing the patch pattern 10, a side wall portion 22 standing from a part of an edge portion of the patch facing portion 21 toward a side where the patch pattern 10 is not present, and a back surface portion 23 arranged to face the patch facing portion 21 with the side wall portion 22 interposed therebetween. A connection point to the coaxial cable is provided in the patch facing portion 21. Therefore, the patch facing portion 21 corresponds to a flat plate portion.
In addition, the direction in which the patch pattern 10 is not present corresponds to the negative direction of the Z axis with respect to the patch opposing portion 21. Since the side wall portion 22 is perpendicular to the patch facing portion 21 and the rear surface portion 23 is provided so as to overlap the patch facing portion 21 in a plan view, the area of the ground pattern 20 (hereinafter referred to as a ground area) when the antenna device 100 is viewed from above coincides with the area of the patch facing portion 21.
As shown in fig. 4, the patch facing portion 21 is formed in a rectangular shape having an edge portion parallel to the X axis and an edge portion parallel to the Y axis. The length Lx in the X-axis direction may be set to λ/2 or more electrically. Here, as an example, the length Lx in the X-axis direction is set to λ/2 (in other words, 25mm) electrically. The length Ly in the Y-axis direction is set to a value (for example, 18mm) electrically shorter than λ/2.
For convenience, the edge parallel to the X axis among the 4 edges of the rectangular patch facing portion 21 is hereinafter referred to as a long edge, and the edge parallel to the Y axis is hereinafter referred to as a short edge. Since they correspond to the long and short sides of the rectangle, respectively. The patch facing portion 21 includes 2 long edge portions facing each other and 2 short edge portions facing each other. Of the 2 long edge portions, the long edge portion located on the negative X-axis direction side is referred to as the 1 st long edge portion, and the long edge portion located on the positive X-axis direction side is referred to as the 2 nd long edge portion.
The 1 st and 2 nd long edges correspond to the 2 ends parallel to the axis of symmetry forming the narrowed width region described in the claim, respectively. The entire area of the patch facing portion 21 corresponds to the width narrowing area described in the claims. The 1 st and 2 nd long edge portions also correspond to the 1 st and 2 nd edge portions described in the claims.
The ground pattern 20 is disposed such that the center of the patch facing portion 21 overlaps the center of the patch pattern 10 in a plan view. The patch facing portion 21 is formed longer than the patch pattern 10 in the X axis direction and shorter than the patch pattern 10 in the Y axis direction, and therefore, in a plan view, only the end portion in the X axis direction of the patch facing portion 21 protrudes from the patch pattern 10. Of the 2 surfaces provided in the patch facing portion 21, the surface facing the patch pattern 10 is referred to as a patch facing surface, and the surface opposite thereto is referred to as an inner surface.
In the present embodiment, the shape of the patch facing portion 21 in a plan view (hereinafter, referred to as a planar shape) is a rectangular shape, but the shape is not limited thereto. The patch facing portion 21 may have a line-symmetric shape such as a diamond shape, a circular shape, a regular hexagonal shape, or a regular octagonal shape. Here, circular also encompasses elliptical. The patch facing portion 21 may be substantially line-symmetric. Therefore, the shape in which the notch, the convex portion, the zigzag-shaped contour, and the like are provided at the outer edge portion of the various line-symmetrical shapes described above is also included in the line-symmetrical shape.
The side wall portion 22 is a rectangular plate-shaped conductive member that is provided to rise from the long edge portion of the chip facing portion 21 toward the Z-axis negative direction along the long edge portion. The side wall 22 is disposed at each of the 1 st and 2 nd long edge portions. For convenience, the side wall 22 disposed along the 1 st long edge portion and the side wall 22 disposed along the 2 nd long edge portion are referred to as the 1 st side wall portion 22A and the 2 nd side wall portion 22B, respectively. The 1 st side wall portion 22A is a side wall portion 22 arranged along the 1 st long edge portion, and the 2 nd side wall portion 22B is a side wall portion 22 arranged along the 2 nd long edge portion.
H shown in fig. 3 indicates the length (in other words, height) of the side wall portion 22 in the Z-axis direction. The height H of the side wall portion 22 may be appropriately designed in accordance with the length γ of the back surface portion 23 in the Y axis direction.
For convenience, a portion of the side wall portion 22 that is joined to the patch facing portion 21 is referred to as an upper end portion. In the side wall portion 22, an end portion on the Z-axis negative direction side (in other words, an end portion on the relatively lower side) is referred to as a lower end portion. Since the side wall portion 22 is a rectangular plate-like member in a side view, the lower end portion is also parallel to the patch facing portion 21.
The back surface portion 23 is a plate-like conductive member extending from the lower end of the side wall portion 22 and disposed to face the inner surface of the patch facing portion 21. Rear surface portion 23 is formed in a rectangular shape along a lower end portion of side wall portion 22. The back surface portion 23 is disposed at the lower end portions of the 1 st side wall portion 22A and the 2 nd side wall portion 22B, respectively.
For convenience, the rear surface portion 23 disposed along the lower end portion of the 1 st side wall portion 22A and the rear surface portion 23 disposed along the lower end portion of the 2 nd side wall portion 22B are referred to as a 1 st rear surface portion 23A and a 2 nd rear surface portion 23B, respectively.
The 1 st back surface portion 23A is a back surface portion 23 formed from the lower end of the 1 st side wall portion 22A toward the lower end of the 2 nd side wall portion 22B. In the 1 st back surface portion 23A, the end portion on the Y-axis positive direction side is not connected to any member, and is an open end. The 2 nd back surface portion 23B is a back surface portion 23 formed from the lower end of the 2 nd side wall portion 22B toward the lower end of the 1 st side wall portion 22A. In the 2 nd back surface portion 23B, the end portion on the Y axis negative direction side is not connected to any member, and is an open end.
The length of the back surface portion 23 in the X axis direction is equal to the length Lx of the side wall portion 22 and the patch facing portion 21 in the X axis direction. As described above, the length γ of the back surface portion 23 in the Y axis direction may be determined by experiments or the like so as to meet the height H of the side wall portion 22.
The sum of the length Ly of the patch opposing portion 21 in the Y axis direction and the value obtained by multiplying the height H of the side wall portion 22 by 2 is set to be shorter than the half wavelength of the target radio wave (in other words, λ/2). The total value (hereinafter, referred to as the total length) of the length Ly of the patch facing portion 21 in the Y axis direction, the value obtained by multiplying the height H of the side wall portion 22 by 2, and the value obtained by multiplying the length γ of the back surface portion 23 by 2 is set to be longer than λ/2 of the target radio wave. In other words, Ly, H, γ are set to satisfy the following expression. (formula) Ly + Hx 2 < lambda/2 < Ly + Hx 2+ gamma x2
Here, the height H is set to 2mm as an example. The length γ is set to 6 mm. That is, the total length of the present embodiment is set to 34 mm. The total length corresponds to a length (in other words, a circumferential length) along the surface of the ground pattern 20 from the open end of the 1 st back surface portion 23A to the open end of the 2 nd back surface portion 23B. The total length corresponds to the circumferential length described in the claims.
In the present embodiment, the side wall portion 22 and the back surface portion 23 are provided on both of the 2 long edge portions provided in the patch facing portion 21 as an example, but the side wall portion 22 and the back surface portion 23 may be provided as only one as in modification 7.
The power feeding unit 30 is configured to electrically connect the inner conductor of the coaxial cable to the patch pattern 10. In the present embodiment, the power supply unit 30 is implemented using a conductive pin (hereinafter, referred to as a power supply pin) 31, as an example. The power feeding pin 31 is electrically connected to the center of the patch pattern 10 through a hole, not shown, provided at the center of the patch facing portion 21 provided in the ground pattern 20.
The connection point between the feed pin 31 and the patch pattern 10 (hereinafter referred to as a feed point) may be provided at a position where impedance matching between the coaxial cable and the antenna device 100 can be achieved at a target frequency. In the present embodiment, the feeding point is provided at the center of the patch pattern 10, but the feeding point may be provided at another location. The state of matching the impedances is not limited to the perfect matching state, and includes a state in which the loss due to the mismatch of the impedances falls within a predetermined allowable range.
Further, the ground pattern 20 is kept electrically disconnected from the power feeding pins 31 by the holes provided in the patch opposing portion 21. A connection point (hereinafter, referred to as a ground point) between the outer conductor of the coaxial cable and the ground pattern 20 is provided in the vicinity of a hole portion through which the power feeding pin 31 provided in the patch opposing portion 21 passes. In the present embodiment, a direct coupling feeding method is adopted as a method of feeding power to the antenna device 100, but an electromagnetic coupling feeding method using a microstrip line or the like may be adopted as another method.
Next, the reason why the reduction in gain can be suppressed while reducing the floor area according to the present embodiment by using the conventional patch antenna 100X shown in fig. 5 will be described. The conventional patch antenna 100X is configured by removing the side wall portion 22 and the back surface portion 23 from the antenna device 100 of the present embodiment, and includes a patch portion 10X and a ground plate 20X.
The patch part 10X is a member corresponding to the patch pattern 10 of the present embodiment, and is formed to have the same size as the patch pattern 10. The ground plate 20X is a flat plate-like member connected to the outer conductor of the coaxial cable. The length of the ground plate 20X in the X axis direction is λ/2 of the target radio wave, as in the present embodiment.
A dotted line denoted by reference sign Ln1 in the drawing is a straight line parallel to the Y axis passing through the center of the ground plate 20X, and a point denoted by reference sign M denotes an intersection between the straight line L1 and an edge portion parallel to the Y axis (hereinafter, referred to as a Y-axis parallel edge portion). The intersection M corresponds to the midpoint of the parallel edge portion of the Y-axis. L α in the drawing indicates the length of the ground plate 20X in the Y-axis direction.
Fig. 6 (a) is a graph schematically showing the current distribution at the Y-axis parallel edge portion. As shown in fig. 6, standing waves are generated around the midpoint M at the Y-axis parallel edge portions. Here, as shown in fig. 6 (B-1), when the length L α in the Y axis direction is shorter than λ/2, a current corresponding to an area denoted by reference numeral Im (hereinafter referred to as an overflow component) in fig. 6 (a) becomes a reverse phase current. The overflow component Im acts to radiate radio waves to the inside of the ground plate 20X. In other words, when the length L α in the Y axis direction is less than λ/2, the overflow component Im acts as a reverse phase current, and thus the gain of the antenna is reduced.
On the other hand, when the length L α in the Y-axis direction becomes λ/2, the end of the Y-axis parallel edge portion is aligned with the node of the standing wave, and therefore, the anti-phase current is less likely to be generated. In other words, a decrease in gain is not easily generated. Therefore, as shown in fig. 7, at least 1 side of the ground plate 20X is designed to be λ/2 or more. Fig. 7 shows a result of simulation of a change in gain when the length L α in the Y-axis direction is changed in a state where the length of the ground plate 20X in the X-axis direction is set to λ/2.
On the other hand, in the configuration of the present embodiment, the circumference (in other words, the total length) from the open end of the 1 st back surface portion 23A to the open end of the 2 nd back surface portion 23B is set to be longer than λ/2. Therefore, as shown in fig. 8, current flows not only through the patch facing portion 21 but also through the side wall portion 22 and the back surface portion 23. Specifically, the overflow component Im is distributed from the side wall portion 22 to the middle of the back surface portion 23. In addition, In is distributed as an inversion phase component In the remaining region of back surface portion 23.
Here, when the component Ima distributed In the back surface portion 23 In the overflow component Im and the inverted-phase component In are equal In size, they cancel each other, and the current distribution is substantially as shown In fig. 8 (C). In other words, there is no current in the reverse phase with respect to the current distributed to the patch opposing part 21.
Therefore, by adjusting the height H of the side wall portion 22 and the length γ of the back surface portion 23, the length Ly in the Y-axis direction can be made smaller than λ/2, and a decrease in gain can be suppressed. Fig. 9 shows the simulation results of the gain when the length γ of the back surface portion 23 was changed from 0mm to 9mm in the configuration in which the height H of the side wall portion 22 was set to 1mm, 2mm, and 3mm, respectively. The long dashed line in fig. 9 indicates the simulation result of the configuration set to H1 mm, the one-dot chain line indicates the simulation result of the configuration set to H2 mm, and the two-dot chain line indicates the simulation result of the configuration set to H3 mm.
In addition, the broken line indicates a simulation result when the length L α of the ground plane 20X in the Y-axis direction is set to λ/2 in the patch antenna 100X shown in fig. 5. In other words, the broken line indicates a simulation result in the conventional (in other words, basic) patch antenna 100X (hereinafter, referred to as a basic patch antenna) including the ground plane 20X having a sufficient size.
The short dashed line indicates a simulation result when the size of the ground plane 20X is set to the same size (L α ═ Ly ═ 18mm) as the patch facing portion 21 included in the antenna device 100 of the present embodiment. The patch antenna 100X in which the size of the ground plate 20X is set to be the same size as the patch facing portion 21 corresponds to a configuration in which the side wall portion 22 and the rear surface portion 23 are removed (hereinafter, a configuration without a side wall portion rear surface portion) in the antenna device 100 of the present embodiment.
As shown in fig. 9, even when γ is assumed to be 0 (in other words, there is no rear surface portion), a gain higher than that of the configuration without the side wall portion indicated by the short dashed line can be obtained in any H. In other words, if the side wall portion 22 is provided, the gain can be improved as compared with a configuration without a side wall portion rear surface portion.
As shown in fig. 9, even if the height H of the side wall portion 22 is set to be short, the length γ of the back surface portion 23 is increased, thereby increasing the gain. Even in any H, by adjusting γ, a gain equal to or higher than that of the basic patch antenna can be realized. For example, when H is set to 1mm and γ is set to 8mm, the same gain as that of the basic patch antenna can be achieved. When H is set to 2mm, γ is set to 6mm, thereby achieving a higher gain than the basic patch antenna. When H is set to 3mm, γ is set to 2 to 5mm, thereby achieving a gain equivalent to that of the basic patch antenna.
Fig. 10 shows the result of comparing the radiation directivity of the antenna device 100 of the present embodiment with the structure of the rear surface portion without a sidewall portion. In fig. 10, a solid line indicates the radiation directivity of the antenna device 100 according to the present embodiment, and a broken line indicates the radiation directivity of the structure without the rear surface portion of the sidewall portion. As shown in fig. 10, by providing the side wall portion 22 and the rear surface portion 23, radiation of the electric wave in the Z-axis negative direction (in other words, the rear side of the antenna) can be suppressed, and the gain in the Z-axis positive direction can be passed.
In the above configuration, by adding the side wall portion 22 and the back surface portion 23 to the chip opposing portion 21, it is possible to suppress a decrease in gain even if the length Ly of the chip opposing portion 21 in the Y axis direction is set to less than half of the target wavelength. In addition, by adjusting the height H of the side wall portion 22 and the length γ of the back surface portion 23, the gain can be improved as compared with the basic patch antenna.
The ground area of the above structure corresponds to the area of the patch facing portion 21. According to the above configuration, the length Ly of the patch opposing portion 21 in the Y axis direction can be reduced by about 7mm as compared with the basic patch antenna. That is, according to the above configuration, the area can be reduced by about 28% as compared with the basic patch antenna. Further, since other components can be disposed in the reduced space, an increase in the antenna area due to the disposition of additional components can be suppressed.
The patch facing portion 21, the side wall portion 22, and the back surface portion 23 constituting the ground pattern 20 may be formed by bending one metal plate. Alternatively, the side wall portion 22 and the back surface portion 23 may be formed of a metal plate, and the side wall portion 22 and the back surface portion 23 may be soldered to the chip opposing portion 21. The patch facing unit 21 may be patterned on the surface of the printed circuit board by a known method such as an additive method or a subtractive method.
[ modification 1]
The side wall portion 22 may be formed by arranging a plurality of conductive pins in a row. When the chip facing portion 21 is formed on one layer (for example, the front surface) of the printed circuit board and the back surface portion 23 is formed on the other layer, the side wall portion 22 may be formed by arranging a plurality of through via holes connecting these 2 layers in a row along the edge portion of the chip facing portion 21.
[ modification 2]
As shown in fig. 11, the ground pattern 20 may not include the back surface portion 23. In other words, the ground pattern 20 may include the patch facing portion 21 and the side wall portion 22. The height H of the side wall 22 may be appropriately designed. As long as the side wall portion 22 is provided, it is confirmed by simulation that a higher gain can be obtained as compared with a hypothetical structure without the side wall portion 22.
Further, the length (so-called circumferential length) along the surface of the ground pattern 20 from the end portion on the Z-axis negative direction side of the 1 st side wall portion 22A to the end portion on the Z-axis negative direction side of the 2 nd side wall portion 22B is preferably λ/2 of the target radio wave. The circumference of modification 2 is Ly + H × 2. In other words, Ly and H are preferably set so that Ly + hx 2 electrically matches λ/2. The matching state is not limited to complete matching, and includes substantially matching. The substantially uniform range corresponds to a range in which a sufficient gain can be obtained as the antenna device 100, and may be, for example, about ± 25%.
[ modification 3]
In the above, the length of the entire region of the patch facing portion 21 in the Y axis direction is set to be less than λ/2, but the present invention is not limited thereto. As shown in fig. 12, it is also possible to form only a part less than a half wavelength. The ground pattern 20 shown in fig. 12 is configured such that the length from the end on the negative Y-axis direction side to the end on the positive Y-axis direction side near the center in the X-axis direction is set shorter than λ/2 of the target radio wave. The patch opposing portion 21 is formed to be line-symmetrical with a broken line Ln2 as an axis of symmetry. In fig. 12, a hatched area Ar of the dot pattern corresponds to the width narrowed area described in the claim. In fig. 12, the width-narrowed area Ar is clearly shown, and therefore, the 1 st side wall portion 22A is transmitted.
In fig. 12, Ly1 indicates the length of the entire patch facing portion 21 in the Y axis direction, and is set to Ly1 ═ λ/2, for example. Ly2 represents the length of the narrowed region Ar in the Y axis direction, and is set to Ly2 < λ/2. Ly2 may be formed, for example, at 0.36. lambda.
Lx1 represents the length of the entire patch facing portion 21 in the X axis direction, and is set to Lx1 ═ λ/2, for example. Lx2 represents the length of the width narrowing region Ar in the X axis direction, and a specific value of Lx2 may be appropriately designed. However, the larger Lx2 is, the larger the amount of reduction in floor area can be. In other words, the larger Lx2 is preferred. Of course, the upper limit of Lx2 is Lx 1. The structure in which Lx 2-Lx 1 is formed corresponds to the ground pattern 20 described in modification 2. The back surface portion 23 may be provided on the side wall portion 22 shown in modification 3.
[ modification 4]
In the above, the configuration in which 2 side wall portions 22 are provided so as to face each other has been disclosed, but the present invention is not limited to this. As shown in fig. 13, the patch facing portion 21 may be formed in a T-shape, and a 3 rd side wall portion (hereinafter, 3 rd side wall portion) 22C may be provided in addition to the 1 st side wall portion 22A and the 2 nd side wall portion 22B.
With this configuration, the length Lx in the X-axis direction can be reduced with respect to the basic patch antenna. In addition, reference numeral Ln2 in the figure denotes an axis of symmetry of the patch opposing part 21. The patch opposing portion 21 is formed to be line-symmetrical with a broken line Ln2 as an axis of symmetry. The back surface portion 23 may be provided on each of the side wall portions 22 shown in modification 4.
[ modification 5]
As shown in fig. 14 and 15, the patch facing portion 21 may be formed in a rectangular shape, and side wall portions 22 may be provided at 4 edge portions of the patch facing portion 21. In other words, the ground pattern 20 may include the 1 st side wall 22A, the 2 nd side wall 22B, the 3 rd side wall 22C, and the 4 th side wall 22D.
For the 1 st side wall part 22A, the 2 nd side wall part 22B and the 4 th side wall part 22D are respectively adjacent side wall parts 22. CL shown in fig. 15 indicates the separation between the 1 st and 2 nd side wall parts 22A and 22B, and between the 1 st and 4 th side wall parts 22A and 22D. A predetermined distance CL is provided between the 1 st side wall portion 22A and the 2 nd side wall portion 22B, and between the 1 st side wall portion 22A and the 4 th side wall portion 22D so as not to electromagnetically couple these. The other side wall portions 22 are also the same.
Further, if one side wall portion 22 is electromagnetically coupled to another side wall portion 22, the path of the current changes, and the above-described effect cannot be obtained. The interval CL may be equal to or more than one percent of the wavelength of the target radio wave.
With this configuration, the length Lx of the patch facing portion 21 in the X axis direction can be reduced as compared with modification 4. In such a configuration, the entire area of the patch facing portion 21 corresponds to the width narrowing area Ar.
[ modification 6]
As shown in fig. 16, a combination of the side wall portion 22 and the back surface portion 23 may be provided on each of 4 sides of the patch facing portion 21 formed in a rectangular shape. In other words, the ground pattern 20 may include the 1 st rear surface portion 23A, the 2 nd rear surface portion 23B, the 3 rd rear surface portion 23C, and the 4 th rear surface portion 23D. Each rear surface portion 23 is formed to have a predetermined interval CL with respect to the adjacent rear surface portion 23. Each rear surface portion 23 may be formed in an isosceles trapezoid shape, for example.
[ modification 7]
As shown in fig. 17, the number of the side wall portions 22 and the rear surface portion 23 of the antenna device 100 may be one. Further, the back surface portion 23 may not be provided, and only one side wall portion 22 may be provided along one edge portion of the patch facing portion 21 formed in a rectangular shape.
[ modification 8]
The side wall portion 22 may not be provided at an edge portion parallel to the axis of symmetry of the line-symmetric pattern. For example, the patch facing portion 21 shown in modification 4 is not line-symmetric in the direction parallel to the Y axis. However, in the patch facing portion 21 shown in modification 4, only the 3 rd side wall portion 22C may be provided without providing the 1 st side wall portion 22A and the 2 nd side wall portion 22B. With this configuration, the reduction in the floor area and the maintenance of the gain can be achieved at the same time.
In the example shown in fig. 13, 2 edge portions parallel to the Y axis and facing each other also correspond to the 1 st edge portion and the 2 nd edge portion described in the claims. Further, the side wall portion 22 may be provided at an edge portion on the X-axis negative direction side of the edge portions parallel to the Y axis. In other words, the side wall portion may be provided only at either the 1 st edge portion or the 2 nd edge portion, or both of them. In the antenna device 100 disclosed as this modification 8, the patch facing portion 21 does not need to have a line-symmetric pattern, but may have a shape having 1-pair of linear outer edge portions facing each other.
Further, when the side wall portions are provided at both the 1 st outer edge portion and the 2 nd outer edge portion, which are the outer edge portions on the straight lines opposed to each other, as described in modification 2, it is preferable that the circumferential length from the end portion on the Z-axis negative direction side of the side wall portion provided at the 1 st outer edge portion to the end portion on the Z-axis negative direction side of the side wall portion provided at the 2 nd outer edge portion be λ/2 of the target radio wave.
As described above, the back surface portion 23 may be provided in the side wall portion 22. When the side wall portion 22 and the back surface portion 23 are provided at the 1 st outer edge portion and the 2 nd outer edge portion, respectively, it is preferable that the circumferential length from the end portion of one back surface portion to the other back surface portion is equal to or greater than λ/2 of the target radio wave, as in the above-described embodiment.
[ modification 9]
The above discloses an embodiment in which the present disclosure is applied to a patch antenna, but the present disclosure is not limited thereto. For example, the present disclosure may also be applied to a monopole antenna. In other words, the linear conductor member as the radiation element may be applied to a structure in which the ground pattern 20 is erected. In this case, the side wall portion 22 may be provided along a part of an edge portion of the flat plate-shaped conductor member (hereinafter, flat plate portion) corresponding to the patch facing portion 21 so as to face the opposite side of the linear conductor member. The present disclosure can be applied to an unbalanced feed type antenna using a flat plate-shaped conductor that supplies a ground potential.
The present disclosure has been described based on the embodiments, but the present disclosure should not be construed as being limited to the embodiments and the structures. The present disclosure also includes various modifications and modifications within the equivalent range. In addition, various combinations and forms including only one element, and other combinations and forms including one or more elements or one element at a time are also within the scope and spirit of the present disclosure.
Claims (11)
1. An antenna device is provided with:
a radiating element (10) as a conductor member electrically connected to the inner conductor of the coaxial cable, and
a flat plate portion (21) as a flat plate-shaped conductor member electrically connected to the outer conductor of the coaxial cable,
the radiation element is disposed to face the flat plate portion with a predetermined gap therebetween,
the flat plate portion is formed in a line-symmetric shape and has a width-narrowed region having a length from one end to an end located on the opposite side with respect to the axis of symmetry, which is set to be shorter than a half-wave of a radio wave to be transmitted/received,
at least one of 2 end portions parallel to the symmetry axis, at which the width narrowed region is formed, is provided with a side wall portion (22) as a conductor member along the end portion in a direction in which the radiation element is not present when viewed from the flat plate portion.
2. The antenna device of claim 1,
the side wall portions are formed as a 1 st side wall portion and a 2 nd side wall portion, respectively, at both of 2 end portions parallel to the axis of symmetry where the width narrowed region is formed.
3. The antenna device of claim 2,
the length of the 1 st side wall portion and the 2 nd side wall portion in the direction perpendicular to the flat plate portion is set so that the circumference from the end portion of the 1 st side wall portion not connected to the flat plate portion to the end portion of the 2 nd side wall portion not connected to the flat plate portion coincides with a half wavelength of the radio wave.
4. The antenna device of claim 1,
a back surface portion (23) which is a flat plate-shaped conductor member is provided on the end portion of the side wall portion which is not connected to the flat plate portion, in a direction orthogonal to the planar direction of the flat plate portion, so as to face the flat plate portion.
5. The antenna device of claim 4,
the side wall portions are formed as a 1 st side wall portion and a 2 nd side wall portion respectively at both of 2 end portions parallel to the axis of symmetry where the width narrowed region is formed,
the back surface portion is provided as a 1 st back surface portion and a 2 nd back surface portion in the 1 st side wall portion and the 2 nd side wall portion, respectively.
6. The antenna device of claim 5,
the width-narrowed area, the 1 st side wall portion, and the 2 nd side wall portion are formed so that a circumferential length from an end portion of the 1 st side wall portion not connected to the flat plate portion to an end portion of the 2 nd side wall portion not connected to the flat plate portion is shorter than a half wavelength of the electric wave.
7. The antenna device of claim 6,
the circumference of the section from the end on the side where the 2 nd side wall portion exists in the 1 st rear surface portion as the rear surface portion provided in the 1 st side wall portion to the end on the side where the 1 st side wall portion exists in the 2 nd rear surface portion as the rear surface portion provided in the 2 nd side wall portion is larger than the half wavelength of the radio wave.
8. The antenna device according to any one of claims 1 to 7,
the flat plate portion is formed in a rectangular shape having sides whose length is set to less than a half wavelength of the radio wave,
the side wall portions are provided on respective sides of the flat plate portion,
a predetermined partition is provided between a certain side wall portion and the side wall portion adjacent to the side wall portion.
9. An antenna device is provided with:
a radiating element (10) as a conductor member electrically connected to the inner conductor of the coaxial cable, and
a flat plate portion (21) as a flat plate-shaped conductor member electrically connected to the outer conductor of the coaxial cable,
the radiation element is disposed to face the flat plate portion with a predetermined gap therebetween or to be erected from the flat plate portion,
the flat plate portion has a shape having a 1 st edge portion and a 2 nd edge portion which are linear and face each other,
the distance between the 1 st edge and the 2 nd edge is set shorter than the half wavelength of the electric wave which is the object of transmitting and receiving signals,
at least one of the 1 st edge portion and the 2 nd edge portion is provided with a side wall portion (22) as a conductor member along the edge portion in a direction in which the radiation element is not present when viewed from the flat plate portion.
10. The antenna device of claim 9,
a back surface portion (23) which is a flat plate-shaped conductor member is provided on the end portion of the side wall portion which is not connected to the flat plate portion, in a direction orthogonal to the planar direction of the flat plate portion, so as to face the flat plate portion.
11. The antenna device according to any one of claims 1 to 7 and 9,
the radiating element is arranged parallel to the slab portion,
the antenna device is configured to function as a patch antenna.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016207044A JP6589815B2 (en) | 2016-10-21 | 2016-10-21 | Antenna device |
| JP2016-207044 | 2016-10-21 | ||
| PCT/JP2017/030230 WO2018074056A1 (en) | 2016-10-21 | 2017-08-24 | Antenna device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109196718A CN109196718A (en) | 2019-01-11 |
| CN109196718B true CN109196718B (en) | 2020-09-01 |
Family
ID=62019472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780033025.3A Expired - Fee Related CN109196718B (en) | 2016-10-21 | 2017-08-24 | Antenna device |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP6589815B2 (en) |
| KR (1) | KR102099162B1 (en) |
| CN (1) | CN109196718B (en) |
| SG (1) | SG11201808505YA (en) |
| WO (1) | WO2018074056A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023120146A1 (en) * | 2021-12-24 | 2023-06-29 | 株式会社ヨコオ | Patch antenna and antenna device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004112391A (en) * | 2002-09-19 | 2004-04-08 | Nippon Soken Inc | Antenna |
| JP3683422B2 (en) * | 1998-10-30 | 2005-08-17 | 三菱電機株式会社 | Microstrip antenna and microstrip antenna substrate |
| JP2010226633A (en) * | 2009-03-25 | 2010-10-07 | Mitsubishi Electric Corp | Microstrip antenna |
| CN202308266U (en) * | 2011-08-17 | 2012-07-04 | 黄新勇 | Dual-polarized antenna radiation unit |
| DE112012000716T5 (en) * | 2011-02-08 | 2013-12-12 | Denso Corporation | Antenna for a radio device |
| US9203146B2 (en) * | 2011-05-24 | 2015-12-01 | Taiwan Semiconductor Manufacturing Company, Ltd. | Antenna using through-silicon via |
| CN105390821A (en) * | 2015-12-17 | 2016-03-09 | 京信通信技术(广州)有限公司 | Antenna and antenna relation plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2606521Y2 (en) * | 1992-02-27 | 2000-11-27 | 株式会社村田製作所 | Antenna device |
| JP2803583B2 (en) * | 1994-11-15 | 1998-09-24 | 日本電気株式会社 | Patch antenna |
| JPH11284429A (en) * | 1998-03-27 | 1999-10-15 | Japan Radio Co Ltd | Diffraction wave suppression type microstrip antenna |
| US6850196B2 (en) * | 2003-01-06 | 2005-02-01 | Vtech Telecommunications, Limited | Integrated inverted F antenna and shield can |
| KR20130077133A (en) * | 2011-12-29 | 2013-07-09 | 한국단자공업 주식회사 | Patch antenna module |
-
2016
- 2016-10-21 JP JP2016207044A patent/JP6589815B2/en not_active Expired - Fee Related
-
2017
- 2017-08-24 WO PCT/JP2017/030230 patent/WO2018074056A1/en active Application Filing
- 2017-08-24 KR KR1020187034973A patent/KR102099162B1/en active IP Right Grant
- 2017-08-24 CN CN201780033025.3A patent/CN109196718B/en not_active Expired - Fee Related
- 2017-08-24 SG SG11201808505YA patent/SG11201808505YA/en unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3683422B2 (en) * | 1998-10-30 | 2005-08-17 | 三菱電機株式会社 | Microstrip antenna and microstrip antenna substrate |
| JP2004112391A (en) * | 2002-09-19 | 2004-04-08 | Nippon Soken Inc | Antenna |
| JP2010226633A (en) * | 2009-03-25 | 2010-10-07 | Mitsubishi Electric Corp | Microstrip antenna |
| DE112012000716T5 (en) * | 2011-02-08 | 2013-12-12 | Denso Corporation | Antenna for a radio device |
| US9203146B2 (en) * | 2011-05-24 | 2015-12-01 | Taiwan Semiconductor Manufacturing Company, Ltd. | Antenna using through-silicon via |
| CN202308266U (en) * | 2011-08-17 | 2012-07-04 | 黄新勇 | Dual-polarized antenna radiation unit |
| CN105390821A (en) * | 2015-12-17 | 2016-03-09 | 京信通信技术(广州)有限公司 | Antenna and antenna relation plate |
Also Published As
| Publication number | Publication date |
|---|---|
| SG11201808505YA (en) | 2018-10-30 |
| KR20190002665A (en) | 2019-01-08 |
| WO2018074056A1 (en) | 2018-04-26 |
| KR102099162B1 (en) | 2020-04-09 |
| JP2018067882A (en) | 2018-04-26 |
| JP6589815B2 (en) | 2019-10-16 |
| CN109196718A (en) | 2019-01-11 |
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