WO2012070678A1 - アンテナおよびダイポールアンテナならびにそれらを用いた通信装置 - Google Patents
アンテナおよびダイポールアンテナならびにそれらを用いた通信装置 Download PDFInfo
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- WO2012070678A1 WO2012070678A1 PCT/JP2011/077369 JP2011077369W WO2012070678A1 WO 2012070678 A1 WO2012070678 A1 WO 2012070678A1 JP 2011077369 W JP2011077369 W JP 2011077369W WO 2012070678 A1 WO2012070678 A1 WO 2012070678A1
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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
- H01Q9/06—Details
- H01Q9/065—Microstrip dipole antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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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
- H01Q9/06—Details
-
- 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
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
Definitions
- the present invention relates to an antenna including a strip-shaped conductor, a dipole antenna including the antenna, and a communication device using them.
- antennas for transmitting and receiving electromagnetic waves in a communication device for example, a dipole antenna and a monopole antenna are known as described in JP-A-5-259728.
- a dipole antenna basically requires a conductor having a length of 1 ⁇ 2 wavelength
- a monopole antenna basically requires a conductor having a length of 1 ⁇ 4 wavelength and also requires a ground plane. There was a problem of becoming large.
- the present invention has been devised in view of such problems in the prior art, and an object of the present invention is to reduce the size of the antenna provided with a strip-shaped conductor, the dipole antenna provided with the antenna, and the antenna. It is to provide a used communication device.
- the antenna of the present invention includes a strip-shaped conductor in which a plurality of strip-shaped m-order elements (m is an integer of 3 or more) are sequentially connected, and the n-order elements (n is 2 or more and m or less) constituting the conductor.
- N-1 order elements are divided into p (n is an integer of 3 or more) n order elements, and the p order n order elements are the n-1 order elements.
- a boundary portion between each of the n-order elements is bent along a straight line parallel to a line segment connecting one end and the other end.
- the dipole antenna of the present invention has a first antenna and a second antenna which are antennas of the present invention, and the first antenna and the second antenna have the same shape of the conductors,
- the primary element is linear, and the line segment connecting both ends of each of the conductors is located on the same straight line.
- the dipole antenna of the present invention has a first antenna and a second antenna which are the antennas of the present invention, and the first antenna and the second antenna have a relationship in which the shapes of the conductors are axisymmetric. And the primary elements of the conductors are linear, and the line segments connecting both ends of the conductors are located on the same straight line.
- the communication device of the present invention includes the antenna of the present invention and at least one of a receiving circuit and a transmitting circuit connected to the antenna.
- the communication device of the present invention includes the dipole antenna of the present invention and at least one of a receiving circuit and a transmitting circuit connected to the dipole antenna.
- the angle between the adjacent n-order elements is an angle between a line segment connecting both ends of one adjacent n-order element and a line segment connecting both ends of the other adjacent n-order element. Means the side of less than 180 °.
- an antenna and a dipole antenna that can be miniaturized can be obtained.
- a communication device including these antennas and capable of being downsized can be obtained.
- FIG. 1 It is a perspective view showing typically an example of an embodiment of an antenna (dipole antenna) of the present invention. It is a typical top view of the antenna (dipole antenna) shown in FIG. It is a typical top view for demonstrating the shape of the conductor 20 in the antenna shown to FIG. 1 and FIG. It is a top view which shows typically an example of embodiment of the antenna of this invention. It is a top view which shows typically an example of embodiment of the antenna of this invention. It is a top view which shows typically an example of embodiment of the antenna of this invention. It is a top view which shows typically an example of embodiment of the antenna of this invention. It is an enlarged view for demonstrating the shape of the conductor 320 of the area
- FIG. 1 is a perspective view schematically showing an example of the first embodiment of the antenna of the present invention.
- FIG. 2 is a schematic top view of the antenna shown in FIG.
- FIG. 3 is a schematic plan view for explaining the shape of the conductor 20 in the antenna of this example shown in FIGS. 1 and 2.
- the antenna of this example includes a dielectric substrate 10 and a strip-shaped conductor 20 having a predetermined shape disposed on the upper surface of the dielectric substrate. Further, the strip-like conductor 20 is divided into a conductor 20a and a conductor 20b at the center, and a terminal portion 30 including terminals 30a and 30b is provided at the divided portions. The conductor 20 is fed to the terminal portion 30 and functions as a dipole antenna having the conductors 20a and 20b as elements.
- the conductor 20 is not divided into the conductor 20a and the conductor 20b but is connected to each other.
- FIG. 3 shows the primary element 41 on the left side, secondary elements 42a to 42d in the center, and tertiary elements 43a to 43s on the right side.
- the pattern design method of the conductor 20 is schematically disassembled.
- the primary element 41 is divided into four secondary elements 42a to 42d. Further, since each of the four secondary elements is divided into four tertiary elements, a total of 16 tertiary elements 43a to 43s are formed. As a result, the conductor 20 in the antenna of this example has a structure formed by sequentially connecting 16 band-like tertiary elements 43a to 43s.
- the linear primary element 41 is divided into four secondary elements 42a to 42d. Then, the boundary portions of the secondary elements 42a to 42d are bent along a straight line parallel to the line segment connecting the one end 41w and the other end 41x of the primary element 41 (illustrated by dotted lines, 52w to 52x). It has a shape. In other words, the boundary portions of the secondary elements 42a to 42d are bent so that the direction of the vector from the one end to the other end of the primary element 41 does not change.
- each of the secondary elements 42a to 42d is divided into four tertiary elements.
- the boundary portions of the tertiary elements 43a to 43d are bent along a straight line (illustrated by a dotted line) parallel to a line segment connecting one end and the other end of the secondary element 42a. ing.
- the boundary portions of the respective tertiary elements 43a to 43s are bent so that the direction of the vector from one end to the other end of each of the secondary elements 42a to 42d does not change.
- the primary element 41 is linear, and the primary element 41 is divided into four secondary elements 42a to 42d having the same length, and adjacent secondary elements 42a to 42d.
- the boundary portions of the secondary elements 42a to 42d are sequentially bent in the opposite direction so that the angle becomes 90 °.
- the secondary elements 42a to 42d are divided into four tertiary elements having the same length, and the secondary elements 42a to 42d are arranged such that the angle between adjacent tertiary elements is 90 °.
- the boundary of each tertiary element is bent in the opposite direction.
- the length of the primary element 41, the length of the secondary shape 52 in which four secondary elements are connected, and the length of the tertiary shape 53 in which 16 tertiary elements are connected are All are equal.
- the secondary shape 52 is 2 ⁇ 1/2 times the primary element 41
- the tertiary shape 53 is 2 ⁇ 1/2 times the secondary shape 52. Therefore, the tertiary shape 53 is 1 ⁇ 2 of the primary element 41. That is, according to the antenna of this example, the length in the longitudinal direction (z direction in the drawing) is reduced to 1 ⁇ 2 compared to a basic antenna having a linear conductor such as the primary element 41. A small antenna can be obtained.
- the following procedure may be performed so that the length in the longitudinal direction (z direction in the figure) becomes a desired length.
- a linear primary element is divided into four secondary elements of equal length, and the boundary between each secondary element is 90 ° so that the angle between adjacent secondary elements is 90 °. Bend sequentially in the opposite direction. At this time, the straight line connecting both ends of the primary element before bending and the straight line connecting both ends of the primary element after bending are made parallel.
- each secondary element is divided into four tertiary elements of equal length, and the boundary part of each tertiary element is bent so that the angle formed by the adjacent tertiary elements is 90 °. At this time, each secondary element is bent in the reverse direction sequentially, and in each secondary element, a straight line connecting both ends before bending and a straight line connecting both ends after bending are made parallel to each other. .
- Procedure 4 If necessary, repeat the operation of Procedure 3 until the order of the elements reaches the desired order.
- the antenna of this example includes a strip-shaped conductor 20 in which a plurality of strip-shaped m-order elements (m is an integer of 3 or more) are sequentially connected, and an n-order element (n Is an integer of 2 or more and m or less), and n-1 order elements are divided into p pieces (p is an integer of 3 or more). Then, the n-order element divided into p pieces is bent along the straight line parallel to the line segment connecting one end and the other end of the n-1 order element. It has a shape. In other words, each n-order element has a bent shape so that the direction of the vector from one end to the other end of the n-1 order element does not change.
- a straight line connecting both ends of the n ⁇ 1 order element before bending and a straight line connecting both ends after bending the n order elements obtained by dividing the n ⁇ 1 order element into p pieces are parallel to each other.
- the maximum order m corresponds to 3
- the division number p corresponds to 4.
- the antenna of this example having such a configuration, since the boundary portion of each n-order element is bent so that the direction of the vector from one end of the n ⁇ 1-order element to the other end does not change, The vector sum of the currents flowing through the m-th order element is substantially equal to the vector from the one end 53w of the conductor 20 toward the other end 53x. That is, the direction of the vector sum of the currents flowing through the individual m-th order elements is almost equal to that of the currents flowing through the conductor 20 consisting only of the primary elements 41 as vectors. Therefore, according to the antenna of this example, compared with the linear antenna having the conductor 20 made of only the original primary element 41, the antenna characteristic is maintained substantially the same including the directivity, and the size is reduced. Antenna can be obtained. Therefore, it is small, high performance, and easy to design.
- the p-order n-order elements are all equal in length, and satisfy the condition that the angles formed by adjacent n-order elements in each n-1 order element are all equal. Is desirable. With this configuration, the symmetry of the antenna is increased, so that it is easy to design an antenna that satisfies desired characteristics.
- the dipole antenna of this example has two, a first antenna (conductor 20a) and a second antenna (conductor 20b) having the same shape. These antennas are antennas having the above-described configuration of the present invention. A line segment connecting both ends of the first antenna (conductor 20a) and a line segment connecting both ends of the second antenna (conductor 20b) are located on the same straight line.
- the antenna according to an embodiment of the present invention which is designed to be reduced in size while maintaining the characteristics as primary element 41 ⁇ secondary shape 52 ⁇ tertiary shape 53, is at the center in the length direction.
- the antenna is divided into two equal parts and the dipole antenna is configured by feeding power to the divided part. Therefore, according to the dipole antenna of this example, it is divided at the central portion of the linear primary element 41 and has almost the same characteristics including directivity as compared with the dipole antenna having a feeding point in this divided portion.
- a dipole antenna that is maintained and further miniaturized can be easily obtained without using electromagnetic field simulation.
- the dielectric substrate 10 has a relative dielectric constant of, for example, about 2 to 20.
- the material of the dielectric substrate 10 is not particularly limited, and a resin such as glass epoxy can be used. Note that it is desirable to use dielectric ceramics from the viewpoints of accuracy in manufacturing the dielectric substrate 10 and ease of manufacture.
- the conductor 20 is made of a highly conductive metal such as gold, silver, copper, and alloys thereof, and the thickness thereof is, for example, about 3 ⁇ m to 50 ⁇ m. You may form using any methods, such as thick film methods, such as printing, and thin film methods, such as PVD method and CVD method.
- FIG. 4 is a top view schematically showing the antenna of the example of the second embodiment of the present invention.
- the overlapping description is abbreviate
- the maximum degree m is 4 and the number of sections p is 4.
- the conductor 120 of the antenna of this example is provided on a dielectric substrate 110, and is formed by sequentially connecting 64 strip-like quaternary elements.
- These quaternary elements are divided into four quaternary elements having the same length as the quaternary elements 43a to 43s of the ternary shape 53 shown in FIG.
- the boundary of each quaternary element in each of the quaternary elements 43a to 43s so that the direction of the vector from one end to the other end of the quaternary element does not change and the angle between adjacent quaternary elements is 90 °.
- the parts are bent sequentially in the opposite direction.
- the antenna of this example compared with a basic antenna having a linear conductor like the primary element 41 in FIG. A small antenna whose length in the z direction is shortened to 2 ⁇ 3/2 times can be obtained.
- the antenna conductor 120 may be divided into two equal parts at the center in the length direction, and feeding points 130a and 130b may be provided in the divided part 130 to form a dipole antenna.
- a line segment connecting both ends of the first antenna (side where the feed point 130a exists) and a line segment connecting both ends of the second antenna (side where the feed point 130b exists) are located on the same straight line. This can be regarded as an embodiment of the dipole antenna of the present invention.
- FIG. 5 is a top view schematically showing the antenna of the example of the third embodiment of the present invention.
- the maximum degree m is 5 and the division number p is 4.
- the antenna conductor 220 of this example is provided on a dielectric substrate 210, and is formed by sequentially connecting 256 strip-like quintic elements. These quintic elements are divided into four quintic elements of the antenna conductor 120 shown in FIG. 4, each quaternary element having an equal length, from one end to the other end of each quaternary element. A shape in which the boundary of each quintic element is sequentially bent in the opposite direction in each quaternary element so that the direction of the vector to be directed does not change and the angle between adjacent quintic elements is 90 °. It has become.
- the antenna of this example compared with a basic antenna having a linear conductor like the primary element 41 in FIG. It is possible to obtain a small antenna whose length in the z direction is reduced to 1/4 times.
- the antenna conductor 220 may be divided into two equal parts at the center in the length direction, and feeding points 230a and 230b may be provided in the divided part 230 to form a dipole antenna.
- the line segment connecting both ends of the first antenna (side where the feed point 230a exists) and the line segment connecting both ends of the second antenna (side where the feed point 230b exists) are located on the same straight line. This can be regarded as an embodiment of the dipole antenna of the present invention.
- FIG. 6 is a top view schematically showing the antenna of the example of the fourth embodiment of the present invention.
- FIG. 7 is an enlarged view showing the state of the conductor in region A of FIG.
- this example parts different from the example of the embodiment described above will be described, and overlapping description of similar elements will be omitted.
- the maximum degree m is 6 and the division number p is 4.
- the conductor 320 of the antenna of this example is provided on a dielectric substrate 310, and is formed by sequentially connecting 1024 strip-like sixth elements.
- These sixth-order elements are divided into four sixth-order elements each having the same length as the fifth-order elements of the conductor 220 of the antenna shown in FIG. 5, from one end to the other end of each fifth-order element.
- a shape in which the boundary portion of each sixth-order element is sequentially bent in the opposite direction in each fifth-order element so that the direction of the vector to go does not change and the angle between adjacent sixth-order elements is 90 ° It has become.
- the antenna of this example compared with a basic antenna having a linear conductor like the primary element 41 in FIG. A small antenna whose length in the z direction is shortened to 2 ⁇ 5/2 times can be obtained.
- the antenna conductor 320 may be divided into two equal parts at the center in the length direction, and feeding points 330a and 330b may be provided in the divided part 330 to form a dipole antenna.
- a line segment connecting both ends of the first antenna (side where the feed point 330a exists) and a line segment connecting both ends of the second antenna (side where the feed point 330b exists) are located on the same straight line. This can be regarded as an embodiment of the dipole antenna of the present invention.
- FIG. 8 is a schematic plan view for explaining a modification of the shape of the conductor.
- the maximum degree m is 3 and the division number p is 5.
- the angle between adjacent n-th elements is 90 °.
- the primary element 440 is divided into five secondary elements 441a to 441e. Furthermore, since each of the five secondary elements is divided into five tertiary elements, there are a total of 25 tertiary elements 442a to 442z. As a result, the conductor in the antenna of this example has a structure in which 25 band-shaped tertiary elements 442a to 442z are sequentially connected.
- the linear primary element 440 is divided into five secondary elements 441a to 441e. Then, the boundary portions of the secondary elements 441a to 441e are bent along a straight line parallel to the line segment connecting the one end 440w and the other end 440x of the primary element 440 (illustrated by dotted lines, 451w to 451x). It has a shape. In other words, the boundary portions of the secondary elements 441a to 441e are bent so that the direction of the vector from the one end to the other end of the primary element 440 does not change.
- each of the five secondary elements 441a to 441e is divided into five tertiary elements.
- each boundary portion of the tertiary elements 442a to 442e is bent along a straight line parallel to a line segment connecting one end and the other end (illustrated by a dotted line).
- the remaining four secondary elements 441b to 441e have shapes in which the boundary portions of the corresponding tertiary elements are bent.
- each of the secondary elements 441a to 441e has a shape in which the boundary part of each of the tertiary elements 442a to 442z is bent so that the direction of the vector from one end to the other end does not change.
- FIG. 9 is a schematic plan view for explaining a modification of the shape of the conductor.
- a different part from the example of 1st Embodiment mentioned above using FIG. 3 is demonstrated, and the overlapping description is abbreviate
- the maximum degree m is 3 and the number of sections p is 4, which is the same as the example of the first embodiment in this respect, but the angle between adjacent n-order elements. Is different from the example of the first embodiment in that the angle is larger than 90 °.
- the primary element 540 is divided into four secondary elements 541a to 541d. Further, since each of the four secondary elements is divided into four tertiary elements, there are a total of 16 tertiary elements 542a to 542s. As a result, the conductor in the antenna of this example has a structure formed by sequentially connecting 16 band-shaped tertiary elements 542a to 542s.
- the angle formed between adjacent elements is larger than 90 °.
- the angles formed by adjacent elements of the tertiary elements 542a to 542s are larger than 90 °.
- the antennas shown in the modification examples 1 and 2 in FIG. 8 or FIG. 9 are both longer in the longitudinal direction than the antenna having the linear conductor shown in each primary element ( The length in the z direction in the figure is shortened. And since the effect of the antenna of this invention demonstrated already is show
- FIG. 10 shows a modification of the dipole antenna of the present invention.
- the first antenna conductor 620a and the second antenna conductor 620b have a line-symmetric relationship with respect to each other about a straight line passing through the feeding point 630 of the dipole antenna.
- the primary element of each conductor is linear, and two line segments connecting both ends of each conductor are located on the same straight line.
- the line-symmetric symmetry axis is orthogonal to this straight line.
- the dipole antenna having such a configuration, in the two conductors 620 (620a, 620b), the magnitudes of the currents flowing through the m-th order element equidistant from the feeding point are equal, and the line segment connecting both ends of the conductor 620 is used. The component in the direction perpendicular to is reversed. Therefore, since the current component in the direction perpendicular to the line segment connecting both ends of the conductor 620 (620a, 620b) cancels out between the two conductors 620a, 620b, the vector sum of the currents flowing through the portions of the two conductors 620a, 620b.
- This direction coincides with the direction of the vector from one end of the conductor 620 (620a, 620b) to the other end. Therefore, according to the dipole antenna having such a configuration, it is possible to obtain a dipole antenna that has almost the same antenna characteristics including directivity as the dipole antenna having a linear conductor and is miniaturized. .
- FIG. 11 is a perspective view schematically showing a modification of the antenna of the present invention.
- the antenna of this example is the same as the antenna of the first embodiment shown in FIGS. 1 and 2, but the conductor 720 and the dielectric substrate 710 are connected to one end and the other end of the conductor 720. It is bent about a straight line parallel to the connecting straight line. This axis is parallel to the z axis shown in each figure.
- the size in the width direction can be reduced in addition to the length direction, so that a smaller antenna can be obtained.
- the conductor 720 is bent with a straight line parallel to a straight line connecting one end and the other end of the conductor 720 as an axis, the one end and the other end of the conductor 720 of the current flowing through the corner of the conductor 720 are connected. A state in which components perpendicular to the connecting straight line cancel each other is stored. Therefore, the antenna characteristics including directivity are hardly changed compared to before bending. That is, according to the antenna of this example, a small, high-performance, easy-to-design antenna with reduced dimensions in both the length and width directions with almost no change in antenna characteristics including directivity. Can be obtained.
- the dipole antenna is exactly the same, with a straight line parallel to the straight line where the line segment connecting both ends of the first antenna conductor 720a and the second antenna conductor 720b is located. It can be folded.
- FIG. 11 shows an example in which the conductor 720 is bent only once at a predetermined angle about a straight line parallel to a straight line connecting one end and the other end of the conductor.
- the angle of bending may be small or large, and a plurality of angles may be bent. Further, it may be bent gently, or may be bent into a cylindrical shape or a spiral shape. Further, there may be any number of shafts when bent.
- the antenna of the present invention (dipole antenna) on a flexible substrate made of a material such as polyimide, the predetermined axis described above (for example, a straight line parallel to a straight line connecting one end and the other end of the conductor)
- a small communication device such as a mobile phone which is a communication device having a limited internal volume
- FIG. 12 schematically shows an example of the embodiment of the communication apparatus of the present invention in a block diagram.
- the communication apparatus of this example includes the antenna 81 of the present invention, and a reception circuit 83 and a transmission circuit 84 connected to the antenna 81 via the antenna duplexer 82.
- the antenna 81 of the present invention can be applied to any of the antennas and dipole antennas described above.
- the communication signal is transmitted and received using the antenna 81 of the present invention that is small and excellent in electrical characteristics. Obtainable.
- the dipole antenna is described as an example.
- the present invention is not limited to this.
- a monopole antenna may be configured such that power is supplied to one end of the conductor.
- belt-shaped 6th element was shown, it is not limited to this. By further increasing the order of the elements, an antenna having a smaller conductor can be obtained.
- the n ⁇ 1 order element may be divided into 3 or more. Moreover, it does not need to be divided equally.
- the boundary part of the adjacent n-th order element is sequentially bent in the reverse direction is shown, the present invention is not limited to this, and the boundary part of the adjacent n-th order element is not sequentially bent in the reverse direction. It doesn't matter.
- the angle at which the pattern is bent has been described as an example of 90 ° or more, it may be smaller than this angle or may be gently bent.
- the radiation characteristics of a linear dipole antenna provided with a linear conductor 20 like the primary element 41 in FIG. 3 were also simulated.
- the relative permittivity of the dielectric substrate 10 was set to 1
- the width of the conductor 20 was set to 0.2 mm
- the total length of the conductor 20 was set to 750 mm
- the center frequency was set to 200 MHz.
- FIG. 13 The coordinate system in these simulations is shown in FIG. 13, and the simulation results are shown in FIGS. 14 shows a radiation pattern of directivity gain in the xy plane, FIG. 15 shows a radiation pattern of directivity gain in the zx plane, and FIG. 16 shows a radiation pattern of directivity gain in the zy plane.
- FIGS. 9 to 11 the radiation pattern of the directivity gain of the antenna of the example is shown by a solid line, and the radiation pattern of the directivity gain of the antenna of the comparative example is shown by a broken line.
- the solid line and the broken line show almost the same trajectory, and the antenna of the example has a length in the longitudinal direction (z direction in the figure) as compared with the antenna of the comparative example. Although it is 1/4, it can be seen that it has almost the same radiation characteristics as the antenna of the comparative example including the directivity.
- the radiation characteristic with the antenna bent 90 ° with respect to the axis parallel to the z-axis was calculated by simulation.
- the dielectric constant of the dielectric substrate 10 was set to 1
- the width of the conductor 20 was set to 0.2 mm
- the total length of the conductor 20 was set to 750 mm
- the center frequency was set to 270 MHz.
- the coordinate system in these simulations is the same as that in FIG.
- FIG. 17 is a radiation pattern of directivity gain in the zy plane.
- the radiation pattern of the directional gain of the antenna bent at 90 ° is shown by a solid line
- the radiation pattern of the directional gain of the antenna shown in FIG. 4 that is not bent is shown by a broken line.
- the solid line and the broken line overlap with each other in the same locus, and it can be seen that the radiation characteristics hardly change including the directivity before and after the folding.
- Dielectric substrate 20 Conductor 41: Primary element 42a to 42d: Secondary element 43a to 43s: Tertiary element 81: Antenna 83: Receiver circuit 84: Transmitter circuit
Abstract
Description
図1は、本発明のアンテナの第1の実施形態の例を模式的に示す斜視図である。図2は、図1に示すアンテナの模式的な上面図である。図3は、図1および図2に示した本例のアンテナにおける導体20の形状を説明するための模式的な平面図である。
図4は、本発明の第2の実施形態の例のアンテナを模式的に示す上面図である。なお、本例においては、前述した第1の実施形態の例と異なる部分について説明し、同様の要素については重複する説明を省略する。本例を一般化した表現で表わすと、最大次数のmは4、区分数pは4である。
図5は、本発明の第3の実施形態の例のアンテナを模式的に示す上面図である。なお、本例においては、前述した実施形態の例と異なる部分について説明し、同様の要素については重複する説明を省略する。本例を一般化した表現で表わすと、最大次数のmは5、区分数pは4である。
図6は、本発明の第4の実施形態の例のアンテナを模式的に示す上面図である。また、図7は図6の領域Aの導体の状態を示す拡大図である。なお、本例においては、前述した実施形態の例と異なる部分について説明し、同様の要素については重複する説明を省略する。本例を一般化した表現で表わすと、最大次数のmは6、区分数pは4である。
以上の実施形態の説明では、区分数pを4とし、隣り合うn次要素同士の角度が90°であるとして説明したが、これに限るものではない。図8は、導体の形状の変形例を説明するための模式的な平面図である。なお、本例においては、図3を用いて前述した第1の実施形態の例と異なる部分について説明し、同様の要素については重複する説明を省略する。本例を一般化した表現で表わすと、最大次数のmは3、区分数pは5である。また、隣り合うn次要素同士の角度は90°である。
図9は、導体の形状の変形例を説明するための模式的な平面図である。なお、本例においては、図3を用いて前述した第1の実施形態の例と異なる部分について説明し、同様の要素については重複する説明を省略する。本例を一般化した表現で表わすと、最大次数のmは3、区分数pは4であり、この点では第1の実施形態の例と同じであるが、隣り合うn次要素同士の角度は90°より大きい角度となっている点が第1の実施形態の例と異なる。
次に、ダイポールアンテナの変形例について説明する。前述した第1~第4の実施形態の例においては、導体の中央部を分割して給電点とすることにより、同一形状の第1のアンテナと第2のアンテナを設け、第1のアンテナの両端を結ぶ線分と第2のアンテナの両端を結ぶ線分が同一の直線上に位置するようにして、ダイポールアンテナを構成した例を示したが、これに限定されるものではない。
図11は本発明のアンテナの変形例を模式的に示す斜視図である。本例のアンテナは、図11に示すように、図1,図2に示した第1の実施形態の例のアンテナにおいて、導体720および誘電体基板710が、導体720の一端と他端とを結ぶ直線に平行な直線を軸として曲げられたものである。この軸は各図で示したz軸に対して平行な軸である。
20:導体
41:1次要素
42a~42d:2次要素
43a~43s:3次要素
81:アンテナ
83:受信回路
84:送信回路
Claims (8)
- 複数の帯状のm次要素(mは3以上の整数)が順次接続されてなる帯状の導体を備え、
前記導体を構成するn次要素(nは2以上m以下の全ての整数)は、n-1次要素がp個(pは3以上の整数)の前記n次要素に区分されて、前記p個に区分されたn次要素が、前記n-1次要素の一端と他端とを結ぶ線分と平行な直線に沿って、各々の前記n次要素同士の境界部で屈曲した形状を有する、アンテナ。 - 前記p個に区分されたn次要素がいずれも等しい長さであり、各々の前記n-1次要素内において隣り合う前記n次要素同士がなす角度がいずれも等しい、請求項1に記載のアンテナ。
- 請求項1または請求項2に記載のアンテナを複数備えるダイポールアンテナであって、
前記複数のアンテナは、第1のアンテナおよび第2のアンテナを有し、
前記第1のアンテナおよび第2のアンテナは、前記導体の相互の形状が線対称の関係を有するとともに前記導体の1次要素が直線状であって、それぞれの前記導体の両端を結ぶ線分が同一の直線上に位置している、ダイポールアンテナ。 - 請求項1または請求項2に記載のアンテナを複数備えるダイポールアンテナであって、
前記複数のアンテナは、第1のアンテナおよび第2のアンテナを有し、
前記第1のアンテナおよび第2のアンテナは、前記導体の相互の形状が等しく、それぞれの前記導体の両端を結ぶ線分が同一の直線上に位置している、ダイポールアンテナ。 - 前記導体が、該導体の一端と他端とを結ぶ直線に平行な直線を軸として曲げられた構造を有している、請求項1または請求項2に記載のアンテナ。
- 前記第1のアンテナおよび第2のアンテナを構成する前記導体が、該第1のアンテナおよび第2のアンテナのそれぞれの前記導体の両端を結ぶ線分が位置している直線に平行な直線を軸として屈曲した構造を有している、請求項3または請求項4に記載のダイポールアンテナ。
- 請求項1、請求項2および請求項5のいずれかに記載のアンテナと、
該アンテナに接続された、受信回路および送信回路の少なくとも一方とを備える、通信装置。 - 請求項3、請求項4および請求項6のいずれかに記載のダイポールアンテナと、
該ダイポールアンテナに接続された、受信回路および送信回路の少なくとも一方とを備える、通信装置。
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US13/989,636 US20130249759A1 (en) | 2010-11-26 | 2011-11-28 | Antenna, dipole antenna, and communication apparatus using the same |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2003521146A (ja) * | 2000-01-19 | 2003-07-08 | フラクトゥス・ソシエダッド・アノニマ | 小型空間充填アンテナ |
JP2006157209A (ja) * | 2004-11-26 | 2006-06-15 | Dx Antenna Co Ltd | 放射器および放射器を備えるアンテナ |
WO2006098004A1 (ja) * | 2005-03-15 | 2006-09-21 | Fujitsu Limited | アンテナ、及びrfidタグ |
JP2010263329A (ja) * | 2009-04-30 | 2010-11-18 | Harada Ind Co Ltd | 空間充填曲線を用いる車両用アンテナ装置 |
Family Cites Families (2)
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US6452553B1 (en) * | 1995-08-09 | 2002-09-17 | Fractal Antenna Systems, Inc. | Fractal antennas and fractal resonators |
US7190319B2 (en) * | 2001-10-29 | 2007-03-13 | Forster Ian J | Wave antenna wireless communication device and method |
-
2011
- 2011-11-28 WO PCT/JP2011/077369 patent/WO2012070678A1/ja active Application Filing
- 2011-11-28 JP JP2012545816A patent/JPWO2012070678A1/ja active Pending
- 2011-11-28 US US13/989,636 patent/US20130249759A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2003521146A (ja) * | 2000-01-19 | 2003-07-08 | フラクトゥス・ソシエダッド・アノニマ | 小型空間充填アンテナ |
JP2006157209A (ja) * | 2004-11-26 | 2006-06-15 | Dx Antenna Co Ltd | 放射器および放射器を備えるアンテナ |
WO2006098004A1 (ja) * | 2005-03-15 | 2006-09-21 | Fujitsu Limited | アンテナ、及びrfidタグ |
JP2010263329A (ja) * | 2009-04-30 | 2010-11-18 | Harada Ind Co Ltd | 空間充填曲線を用いる車両用アンテナ装置 |
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JPWO2012070678A1 (ja) | 2014-05-19 |
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