JP2003152437A - Antenna unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high performance convenient antenna unit in which reduction of radio wave due to transmission loss of a window glass plate, or the like, for installing an antenna unit can be limited. SOLUTION: The antenna unit comprises a transparent arranging body 5, a body 1 for converging radio wave, a matching body 9 interposed between the arranging body 5 and the converging body 1, a section for receiving a radio wave being converged by the converging body 1, and/or a transmitting section 2 for radiating a radio wave toward the converging body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device, and more particularly to an antenna device in the microwave and millimeter wave range used for communication and broadcasting.

[0002]

2. Description of the Related Art Conventionally, as communication antennas and broadcasting antennas, so-called parabolic antennas are known in which radio waves are focused on a focal point by a reflecting mirror such as a parabolic surface. As the installation means, install a pillar with sufficient thickness so that sufficient strength can be obtained in consideration of the weight of the antenna, wind and snow on the roof of a building or other building, for example, on the roof, The structure is such as fixing a mirror.

Since such an antenna device is exposed to rainwater, it is required to have durability so that the antenna and the pillars will not be rusted, but the antenna device deteriorates quickly and requires maintenance. Further, since the parabola antenna is installed so as to project outside, there is a problem that the appearance of the entire building such as a building is impaired.

Therefore, it is considered that a parabola antenna or the like is installed indoors, or a lens or a diffraction grating for converging the radio waves is installed in the opening of a building to condense the radio waves and increase the energy density for reception. Japanese Patent Laid-Open No. 11-15
Japanese Patent No. 0416 (Antenna: Deutsche Telecom AG) proposes an antenna in which a structure for diffracting electromagnetic signals in the microwave and millimeter wave regions is attached instead of the window or integrated with the window or a part of the window. There is. It is proposed in this publication to attach a visually transparent diffractive structure (eg a Fresnel zone plate) or to integrate this diffractive structure with a window.

Japanese Unexamined Patent Publication No. 4-134909 discloses a diffractive ring formed of a highly transparent transparent conductive thin film on a window glass, and a receiving pickup antenna section disposed at a substantially focal position of the diffractive ring. A diffractive ring antenna composed of In addition, in the publication,
A diffractive ring formed on a transparent conductive thin film is provided on a transparent insulating plate, and this structure is attached to a window glass with an adhesive applied to one surface of the structure in which the diffractive ring and the transparent insulating plate are integrated. The technology to do this is described.

[0006]

However, when the antenna including the diffraction ring for converging the radio wave is attached to the window, sufficient reception performance is obtained due to the loss caused by the multiple reflection between the diffraction ring and the window glass plate. There was a problem that can not be. In particular, since the wavelength becomes shorter in the millimeter wave and microwave bands, there is a problem that multiple reflection between the diffraction ring and the window glass plate has a great influence.

[0007]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and includes an arrangement body having transparency, a converging body for converging radio waves, and the arrangement body and the converging body. Provided is an antenna device, comprising: a matching body provided between the receiving body and a receiving unit that receives a radio wave converged by the converging body and / or a transmitting unit that emits a radio wave toward the converging body. To do.

Further, according to the present invention, the arrangement body is a window glass plate arranged in a building, and the converging body is formed in a flat shape, and the converging body is inclined with respect to the arrangement body. The above antenna device is provided. Further, the present invention provides the above antenna device, wherein the thickness of the arrangement satisfies the following expression (1) with respect to the wavelength of the radio wave and the incident angle of the radio wave.

[0009]

[Equation 3]

In the present invention, simply the wavelength λ of the radio wave is used.
Even in such a case, it means the wavelength when passing through a vacuum. Further, the present invention includes a transparent planar arrangement body, an antenna main body for transmitting and / or receiving radio waves, and a matching body provided between the arrangement body and the antenna main body. An antenna device is provided, wherein the thickness of the arrangement satisfies the following expression (2) with respect to the wavelength of the radio wave and the incident angle of the radio wave. Here, the antenna body includes a converging body for converging radio waves in the antenna device, and a transmitter and / or receiver for transmitting and receiving radio waves.

[0011]

[Equation 4]

The radio wave in the present invention is preferably a radio wave in the microwave or millimeter wave region. Here, the microwave refers to a radio wave with a frequency of about 1 GHz to 3 THz, and the millimeter wave refers to a radio wave with a frequency of about 30 GHz to 300 GHz. Millimeter waves form part of the microwave band. Further, the converging body refers to one that converges, diffracts, enhances, or deflects a radio wave.

It should be noted that any one of the above antenna devices is
The radio wave reception function will be mainly described. However, the present invention utilizes the reversibility of transmission and reception of radio waves to diffract or deflect the radio waves transmitted from the transmission unit into plane waves and transmit the radio waves in a predetermined direction. It may be a device. Further, the equation (1) and the equation (2) are the same.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.
Hereinafter, the present invention will be described based on the first aspect and the second aspect. First, the first aspect of the present invention will be described. The antenna device according to the first aspect of the present invention is
An arrangement having transparency and a converging body for converging radio waves,
A matching body provided between the disposing body and the converging body, a receiving unit for receiving the radio wave converged by the converging body, and / or
Alternatively, it includes a transmitter that emits a radio wave toward the converging body.

Next, the second aspect of the present invention will be described. An antenna device according to a second aspect is a transparent planar arrangement body, an antenna main body for transmitting and / or receiving radio waves, and a matching element provided between the arrangement body and the antenna main body. An antenna device comprising a body, and the thickness of the arrangement body satisfies the formula (2) with respect to the wavelength of the radio wave and the incident angle of the radio wave.

That is, the antenna body in the second aspect may be either an aperture plane antenna or a plane antenna. In addition, the transmission loss can be reduced by satisfying the formula (2) with respect to the wavelength of the radio wave and the incident angle of the radio wave. Further, the converging body 1 and the transmitting unit and / or the receiving unit may be integrated to form an antenna body. The antenna body may or may not include the converging body.

The first mode and the second mode will be described below, but unless otherwise stated, they are common matters and conditions to the first mode and the second mode. The present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a side surface of an antenna device showing a first aspect and a second aspect of the present invention. In FIG. 1, the window glass plate 4 is supported by the window frame 6 and is arranged so as to be divided into an outdoor side to which the radio wave 3 arrives and an indoor side that is the opposite side.

For example, the converging body 1 in which the Fresnel zone portion is formed on the window glass plate side is arranged substantially parallel to the window glass plate 4. There is a thickness g between the window glass plate 4 and the converging body 1.
The matching body 9 of is arranged. The transmitting unit and / or the receiving unit 2 is
It is arranged at the focus position of the converging body 1. The radio wave 3 passes through the window glass plate 4, is converged by the converging body 1, and is converged on the transmitting unit and / or the receiving unit 2. The converging body 1 and the transmitting unit and / or the receiving unit 2 form an antenna body according to the second aspect of the present invention.

The first aspect of the present invention provides an antenna device in which the influence of the transmission loss can be reduced very easily by providing or arranging a matching body between the arrangement body and the converging body. A second aspect of the present invention provides an antenna device in which the influence of the transmission loss can be reduced very easily by providing or arranging a matching body between the arrangement body and the antenna body.

In the first aspect, it is preferable that the thickness L of the arrangement satisfies the formula (1) with respect to the wavelength λ of the radio wave and the incident angle θ. Further, in the second aspect, the thickness L of the arrangement satisfies the formula (2) with respect to the wavelength λ of the radio wave and the incident angle θ.

The arranging body is a visually transparent object or structure which is arranged at a predetermined angle or position with respect to radio waves, and is specifically attached to a building or a vehicle such as an automobile. A glass plate, a plastic film, a plastic plate, or the like.

The shape and use of the arrangement are not particularly limited, and include, for example, 1) a transparent glass plate made of a soda lime glass plate, a window glass plate such as a frosted glass plate,
2) Window glass plates for vehicles such as automobiles, 3) plastic films such as PET, 4) plastic plates made of acrylic resin, etc. 5) glass plate windows and plastic windows such as measuring instruments.

For example, a window glass plate is used as the arrangement,
The thickness of the arrangement body will be described as the thickness of the window glass plate.
When the relative permittivity of the window glass plate is ε _r , the wavelength of the radio wave is λ, and the incident angle of the radio wave with respect to the window glass plate is θ, the thickness L of the window glass plate is expressed by equation (3). , The transmission loss of radio waves in the arrangement is reduced. When Expression (3) is satisfied, the transmission / reception characteristics can be improved. In the formula (3), the window glass plate has a small dielectric loss and is ignored, and n ₁ is a natural number.

[0024]

[Equation 5]

The converging body in the first mode and the converging body in the mode in which the antenna main body in the second mode includes the converging body are not particularly limited and may have any known structure. As an example, a configuration in which radio waves are converged by a plane diffraction ring, particularly a configuration of a Fresnel zone plate will be described below, but the present invention is not limited to these configurations.

The converging body is preferably formed in a planar shape, but it does not necessarily have to be a flat surface. For example, the converging body may have a three-dimensional shape as a Fresnel lens and may be formed in the thickness direction of a transparent body such as a glass plate. It may be a radio wave converging body that forms radio wave diffractive elements in a stepwise manner to correct the phase difference of the radio wave, or a radio wave converging body of a phase correction type configuration in which dipoles are adjusted and arranged for each zone.

To form the radio wave diffractive element in a stepwise manner in the thickness direction of the glass plate, the glass plate may be formed by etching a plurality of times, or the glass plate may be cut using a grindstone or the like. Good.

The Fresnel zone plate may be simply referred to as a zone plate or a Fresnel (ring) strip plate (for example, see Riki Ogawa and Moriaki Wakaki, "Introduction to Optical Engineering", Practical Publisher),
The Fresnel zone portion is formed on the substrate. The Fresnel zone portion has the following effects.

As shown in FIG. 2, a plane S passing a point C on the way, where A is a radio wave (light) transmitting point of wavelength λ and B is a receiving point.
A concentric circle centered on the point C and having radii r ₁ , r ₂ , ... R _m is provided on the substrate. In this case, the points C ₁ , C on this concentric circle
₂ , ... C _m (m is a natural number) and the radius r of the concentric circles are determined so that the distance between the point B and the distance between CB is λ / 2, λ, ..., Mλ / 2, respectively. In the electric field passing through the annular region, which is a zone sandwiched between the concentric circles, the propagation distances of two adjacent zones differ from each other by λ / 2, so that the phases of the radio waves appear at the receiving point B in an alternating manner. In the Fresnel zone portion, an annular portion formed by the plurality of concentric circles is alternately used as a radio wave transmission / non-transmission portion, and the radio wave of the wavelength λ transmitted from the transmission point A is diffracted on the plane S at the point C on the way. , Converge to the reception point B.

Therefore, the pattern in which the annular portions surrounded by a plurality of concentric circles are alternately configured as the radio wave transmitting portion and the radio wave non-transmitting portion has positive and negative focal lengths with respect to the radio wave of the wavelength λ. It can be used as a converging element. Figure 3 shows one of the Fresnel zone patterns.
Here is an example:

The example of FIG. 3 shows a pattern of Fresnel zones formed on the same plane of a transparent substrate. A ring group having a plurality of ring-shaped portions alternately serving as radio wave transmitting portions and radio wave transmitting portions, Alternatively, the elliptic ring groups described below do not have to be formed on the same plane, and may be formed on a plurality of different planes as long as radio waves converge.

The distance from the transmission point A to the point C and the distance from the reception point B to the point C shown in FIG.
Assuming ₁ and d ₂ , the radius r _m of the m-th zone is expressed by the following equation (4). In formula (4), m is 1, 2,
3 ... m.

[0033]

[Equation 6]

That is, the Fresnel zone pattern is
It is a plurality of annular patterns divided into concentric circles having a radius proportional to the square root of the number m of the concentric circles counted from the center and the product of the wavelength λ.

The shape of the Fresnel zone pattern is designed according to the usage conditions. The above description is for the case where a radio wave is perpendicularly incident on the plane S, and in the Fresnel zone pattern described above, the radio wave transmission portion and the radio wave non-transmission portion are continuous in a plurality of annular shapes from the center toward the outside. It will be a group of concentric circles formed alternately.

When the radio wave has an inclination with respect to the plane S, the Fresnel zone pattern becomes an elliptic ring group. For example, when a radio wave enters the S surface with an elevation angle as shown by the line A′B ′ in FIG. 2, it becomes an ellipse group having a long axis passing through the point C in the up and down direction on the S surface, and the radio wave is transmitted. The portions and the radio wave opaque portions are continuously and alternately formed in a plurality of elliptical rings. The wavelength of the radio wave may be one specific wavelength such as λ, or may be a wavelength having a bandwidth.

As the Fresnel zone portion formed on the converging body, a metal foil or the like in which a metal foil such as aluminum or silver is attached to the surface of a transparent substrate such as a glass plate or plastic is formed. Examples thereof include a soret type (a type in which metal films and the like are arranged in a concentric pattern). The metal foil or the like may be provided on any flat surface of the transparent substrate, but it is environmentally preferable to provide it on the surface on the side of the arrangement body.

Features of the antenna device of the first aspect and the second feature
The feature of the aspect in which the antenna main body in the above aspect includes the converging body is that the antenna body has a matching body between the arrangement body and the converging body. In order to minimize the transmission loss of the above-mentioned arrangement, it is preferable to properly set the thickness of the matching body and the relative permittivity of the matching body.

Thickness L of arrangement body, thickness L of matching body₁, Radio wave
Angle of incidence θ, relative permittivity ε of the arrangement _rAnd matchmaking
Electricity ε_r1It is better to satisfy the following equation (5) between
This is preferable because the transmission loss of the above-mentioned arrangement can be reduced. Less than
In the equation (5) of, m is a natural number.

[0040]

[Equation 7]

In the equation (5), the dielectric loss of the disposing body and the dielectric loss of the matching body are small, so they are ignored, and the difference between the relative permittivity ε _r and the relative permittivity ε _r1 is 5 or less. . Further, when the preferable range of L ₁ is determined in consideration of the allowable value from the expression (5), the following expression (6) is derived.

[0042]

[Equation 8]

Any material can be used as the material of the matching body as long as it is a dielectric such as glass, synthetic resin and ceramics. The sum of the thickness of the matching body (in the case where the converging body is inclined relative to the arrangement body, the maximum distance between the arrangement body and the converging body) and the thickness of the converging body is the antenna of the present invention. In order to make the device thin, 200 mm or less is preferable and 10
0 mm or less is more preferable, and 50 mm or less is particularly preferable.

The aligning body may be attached to the disposing body with an adhesive, and the converging body may be attached to the aligning body with an adhesive. However, the present invention is not limited to this means, and the arrangement body, the matching body, and the converging body may be fixed by mechanical means such as metal fittings.
Further, the converging body and the disposing body may be provided substantially in parallel with each other with the matching body sandwiched therebetween, or may be provided not in parallel.

When the Fresnel zone portion of the converging body and the disposing body are not parallel to each other, the preferable range of the inclination angle of the converging body with respect to the disposing body is -10 to +10 degrees, and more preferably. -5 degrees to +5 degrees, particularly preferably-
It is 2 degrees to +2 degrees. Only one of the inclination angle and the interval may be provided, or both of them may be provided.

In the aspect in which the antenna device of the first aspect and the antenna body of the second aspect include the converging body,
It has a transmitter and / or a receiver arranged at a position where radio waves are converged. The structure of the transmission unit and / or the reception unit is not limited, but both transmission and reception may be performed, or transmission and reception may be performed independently. Any of commercially available ones and known ones may be used. As an example, the one shown in FIG. 1 is composed of a radiator 7 and a converter 8.

The transmitting unit and / or the receiving unit 2 is supported / mounted on a mounting table whose angle and height can be changed within a desired range.
It is preferably fixed. Arrangement 5 is window glass plate 4
In this case, the mounting table may be provided on the support arm fixed to the window frame 6. Although the radiator 7 shown in FIG. 1 is shown as a horn structure, it may be composed of a spiral, a dipole, a strip line, a slot, or the like.

The antenna main body in the second mode may be an antenna of any known structure, and for example, an aperture plane antenna having a substantially plane aperture plane, for example, a reflector antenna, a horn antenna, the first antenna described above. A lens antenna or the like that transmits and receives radio waves by using the converging body in the aspect is included. In addition to the above-mentioned antenna, for example, a planar structure in which a slot array antenna or a microstrip antenna having a planar structure configured by a slot array formed on a conductor wall surface of a waveguide or a strip line is arrayed in a planar shape using an element is used. A planar antenna such as an array antenna can be used. Further, the converging body 1 and the transmitting unit and / or the receiving unit 2 in the example of FIG. 1 may be integrated to form an antenna body. That is, the antenna body may include a converging body. An aperture plane antenna, a plane antenna, etc. are used for the antenna main body in the second aspect.

The above description will be described with reference to the drawings.
FIG. 4 shows that when the window glass plate is a soda lime window glass plate (relative permittivity ε _r = 7.0) and the incident angle θ of the radio wave is 0 °, the transmission loss of the soda lime window glass plate is It is a characteristic view showing how it changes with respect to the thickness L of the lime window glass plate.

Here, the horizontal axis of the characteristic diagram in FIG. 4 is normalized by dividing the thickness L of the soda window glass plate by the wavelength λ _d of the radio wave when the radio wave passes through the soda window glass plate. Represents a value. In such FIG. 4, the transmission loss of the soda lime window glass plate shows the characteristic of curve C. According to the characteristic of the curve C, the value of L / λ _d is 0, 0.5,
1.5, ... That is, when it is approximately n ′ / 2 (n ′ is an integer of 0 or more), the value of this transmission loss takes a minimum value.

When the value of L / λ _d gradually deviates from the vicinity of n ′ / 2, the change in the value of this transmission loss gradually increases according to the value of L / λ _d , and eventually the value of this transmission loss becomes smaller. The change is largest and forms a peak. Further, as the value of L / λ _d increases, the change in the value of this transmission loss becomes smaller, and
It decreases until the value of / λ _d becomes (n ′ + 1) / 2.
After this, the value of this transmission loss repeats the change according to the curve C according to the value of L / λ _d .

It can be seen that when the thickness L of the soda lime window glass plate, the wavelength λ _d of the radio wave and the incident angle θ of the radio wave satisfy the above equation (3), the influence of the transmission loss is reduced. This change in the value of the transmission loss has a similar tendency even when a dielectric material other than the soda lime window glass plate is used as the disposing body.

When the thickness L of the soda lime window glass plate takes a value near the expression (3), there are few problems caused by this transmission loss, and good transmission and reception can be performed. By arranging the matching body between the arrangement body and the antenna body, the influence of this transmission loss can be reduced, but the thickness L of the soda lime window glass plate is in the vicinity of the thickness represented by the formula (3). When the value of is taken, it is difficult to reduce the influence of the transmission loss even if the matching body is arranged between the arrangement body and the antenna body.

On the other hand, when the thickness L of the window glass plate takes a value outside the vicinity of the expression (3), the influence of this transmission loss becomes large. If the value of this transmission loss is less than 1 dB, good transmission / reception can be realized and there is almost no hindrance in communication. In other words, when the value of the transmission loss is 1 dB or more, the influence of the transmission loss can be reduced by disposing the matching body between the arrangement body and the antenna body.

The thickness L of the soda-lime window glass plate which can reduce the influence of the transmission loss by disposing the matching body between the disposing body and the antenna body.
And the wavelength λ _d are determined by the intersection of the straight line Q and the curve C where the value of the transmission loss is 1 dB in FIG. That is, the corresponding range is between points a and b and between points c and d shown in FIG.

Here, on the horizontal axis in FIG. 4, the value at point a is (1 / 4-1 / 5) = 0.05, and the value at point b is (1
/4+1/5)=0.45, and the value at point c is (3 / 4-1 /
5) = 0.55, and the value at point d is (3/4 + 1/5) = 0.
The value at point 95 and point e is (5 / 4-1 / 5) = 1.05. The ranges between the points a and b and between the points c and d are almost determined by the equation (1) or the equation (2).

When the radio wave is greatly affected by the transmission loss, such as between points a and b and between points c and d, the material, thickness, etc. of the matching member are reduced so that the transmission loss is less affected. Is preferably selected.

The window glass plate 4 and the converging body 1 are not substantially parallel to each other and the window glass plate 4 and the converging body 1 have an inclination angle. The effect of this transmission loss can be reduced by arranging.

[0059]

EXAMPLES The present invention will be described below with reference to examples.
The present invention is not limited to these examples, and various improvements and modifications are included in the present invention as long as they do not impair the gist of the present invention.

Example 1 The antenna device shown in FIG. 1 was manufactured by using a commercially available circular waveguide probe as the transmitter and / or receiver 2. A commercially available soda-lime window glass plate 4 having a thickness of 3.2 mm (relative permittivity ε _r
= 7.0) was used.

Aluminum foil was attached to the surface of a commercially available soda-lime glass plate 4 having a thickness of 2.4 mm with the structure shown in FIG. 3 and the following dimensions to prepare a converging body 1 which is a Fresnel zone plate. The zone portion is arranged facing the transmitting unit and / or the receiving unit 2 side. In addition, the hatched portion in FIG. 3 is the portion to which the aluminum foil is attached. The distance f between the converging body 1 and the transmitter and / or receiver 2 was 100 mm.

2r ₁ = 69 mm, 2r ₂ = 99 mm, 2r ₃ = 123 mm, 2r ₄ = 143 mm, 2r ₅ = 162 mm, 2r ₆ = 180 mm, 2r ₇ = 197 mm.

The frequency of the radio wave was set to 26.000 GHz (wavelength λ = 11.5 mm), and the incident angle to the arrangement body 5 in the azimuth direction was set to 0 °. The material of the matching body 9 was changed, and the output of the antenna body was measured. The relative values of received power shown in Table 1 are based on the case where the window glass plate is not provided, and the same applies to the following tables.

[0064]

[Table 1]

The value of L / λ _d is 0.73, which is a range obtained by dividing the range represented by the above formula (1) by the wavelength λ _d , that is, within the range of 0.55 <L / λ _d <0.95. It is in.

Example 2 Using the commercially available circular waveguide probe as the transmitter and / or receiver 2, the antenna device shown in FIG. 1 was manufactured. A commercially available soda-lime window glass plate 4 having a thickness of 3.2 mm (relative permittivity ε _r
= 7.0) was used.

FIG. 5 is a front view showing a phase compensation type Fresnel lens used as the converging body 1, and FIG. 6 is a sectional view showing the phase compensation type Fresnel lens. In this embodiment, the thickness is 20
A commercially available acrylic plate having a diameter of 300 mm was manufactured as the phase-compensating Fresnel lens 10 having a diameter of 300 mm and having a three-dimensional shape as shown in FIG. The Fresnel zone portion was arranged toward the soda lime window glass plate 4 side. The distance f between the converging body 1 and the transmitter and / or receiver 2 is 100 mm.
And

This phase-compensating Fresnel lens 10 is a group of six sub-zones in which the thickness is adjusted by providing a stepwise recess in the thickness direction of the acrylic plate, that is, the second to fourth sub-zones 12 to 14, 6th-8th subzone 16-
18, the 10th to 12th subzones 20 to 22 are the 9th, 14th to 16th subzones 24 to 26, the 18th to 20th subzones 28 to 30 and the 22nd to 24th subzones 32.
~ 34 subgroups of 6 are provided. Each of these groups includes a fifth sub-zone 1 between a first sub-zone 11 and a fifth sub-zone 15 having the thickness of the acrylic plate before the formation of the sub-zone.
Between the fifth sub-zone 19 and the ninth sub-zone 19
And the thirteenth subzone 23, the thirteenth subzone 2
It is provided between the 3rd and 17th subzones 27, between the 17th subzone 27 and the 21st subzone 31, and between the 21st subzone 31 and the 25th subzone 35.

These subzones serve as radio wave diffractive elements utilizing the thickness of the acrylic plate, which is a dielectric, and constitute a converging body for correcting the phase of radio waves. The dimensions of each part of the Fresnel lens 10 of the present embodiment can be obtained by the following formula (5), where λ is the wavelength of the radio wave and F is the focal length. In the equation (7), k is a natural number.

[0070]

[Equation 9]

The dimensions of each part of the Fresnel lens 10 obtained by the above equation (7) are as follows. Although R _{5 to} R ₂₂ are not shown, the distance (radius) from the center 100 to each step is R ₁ and R, respectively, for the steps that are sequentially arranged from the center 100 of the Fresnel lens 10 toward the outside. _2, and the _{R 3 · · · · R 24} .

2R₁ = 48.0 mm, 2R₂ = 68.4
mm, 2R₃ = 84.4 mm, 2R _Four = 98.2 mm,
2R_Five = 110.4 mm, 2R₆ = 121.8 mm, 2
R₇= 132.4 mm, 2R₈ = 142.4 mm, 2R₉
 = 152.0mm, 2R_Ten= 161.4 mm, 2R₁₁
= 170.2 mm, 2R₁₂= 179.0 mm, 2R₁₃=
187.4 mm, 2R₁₄= 195.6 mm, 2R₁₅= 2
03.6 mm, 2R₁₆= 211.6 mm, 2R₁₇= 21
9.4 mm, 2R₁₈= 227.0 mm, 2R₁₉= 23
4.6 mm, 2R₂₀= 242.0 mm, 2R_{twenty one}= 24
9.4 mm, 2R_{twenty two}= 256.6 mm, 2R_{twenty three}= 26
3.8 mm, 2R_{twenty four}= 270.8 mm.

The frequency of the radio wave was set to 26.000 GHz (wavelength λ = 11.5 mm), and the incident angle to the arrangement body 5 in the azimuth direction was set to 0 °. The material of the matching body 9 was changed, and the output of the antenna main body was measured.

[0074]

[Table 2]

The value of L / λ _d is 0.73, which is the range obtained by dividing the range represented by the above formula (1) by the wavelength λ _d , that is, 0.55 <L / λ _d <0.95. Within range.

Example 3 An antenna device was constructed by using a commercially available Cassegrain antenna, which is one type of reflector antenna, as the antenna body. FIG. 7 is a schematic diagram showing a Cassegrain antenna used in the antenna device of this embodiment. The Cassegrain antenna has a main reflector 40 having a parabolic surface 40a, a primary radiator 41 corresponding to the transmitter and / or receiver 2, and a sub-reflector 42 having a hyperboloid 42a. The paraboloid 40a of 40 and the hyperboloid 42a of the sub-reflecting mirror 42 are arranged to face each other. In FIG. 7, G is the thickness of the matching body. Commercially available soda lime window glass plate 4 having a thickness of 3.2 mm as the arrangement body 5.
(Relative permittivity ε _r = 7.0) was used.

The frequency of the radio wave was set to 26.000 GHz (wavelength λ = 11.5 mm), and the incident angle to the arrangement body 5 in the azimuth direction was set to 0 °. The material of the matching body 9 was changed, and the output of the antenna main body was measured.

[0078]

[Table 3]

The value of L / λ _d is 0.73, which is the range obtained by dividing the range represented by the above formula (1) by the wavelength λ _d , that is, 0.55 <L / λ _d <0.95. Within range.

[0080]

Since the antenna device of the present invention has the matching body, the matching body can reduce the influence of the transmission loss of the arrangement body such as the window glass plate. Therefore, high reception performance can be obtained with a simple device. Also, when using a converging body of radio waves, any structure can be used, so it is possible to easily set it inside a building or the like and realize a durable antenna device that is not affected by deterioration due to wind and snow. Microwave wireless communication, for example, FW, which can be used as an antenna device having high convergence efficiency without damaging the appearance of a building.
It can be suitably used for A (Fixed wireless access) and the like.

[Brief description of drawings]

FIG. 1 is a schematic view showing a side surface of an antenna device of the present invention.

FIG. 2 is a schematic diagram illustrating a Fresnel zone.

FIG. 3 is a plan view of the converging body of FIG.

FIG. 4 is a soda-lime window glass plate (relative permittivity ε _r = 7.0), and when the incident angle θ of radio waves is 0 °, the transmission loss of the soda-lime window glass plate is The characteristic view showing how it changes with respect to the thickness L of the lime window glass plate.

5 is a front view showing a phase compensation type Fresnel lens used in Example 2. FIG.

FIG. 6 is a sectional view showing a phase compensation type Fresnel lens used in Example 2;

FIG. 7 is a schematic diagram showing a Cassegrain antenna used in the antenna device of Example 3;

[Explanation of symbols]

1: Converging body 2: Transmitter and / or receiver 3: Radio wave 4: Window glass plate 5: Arrangement 6: Window frame 7: radiator 8: Converter 9: Matching body 10: Phase compensation type Fresnel lens 11: First subzone 12 to 14: 2nd to 4th subzones 15: 5th subzone 16-18: 6th-8th subzones 19: 9th subzone 20-22: 10th-12th subzones 23: 13th subzone 24-26: 14th-16th subzones 27: 17th subzone 28-30: 18th-20th subzones 31: 21st subzone 32-34: 22nd-24th subzones 35: 25th subzone 40: Main reflector 41: Primary radiator 42: Sub-reflector

Claims (4)

[Claims] 1. A transparent arrangement body, a converging body for converging radio waves, a matching body provided between the arrangement body and the converging body, and a radio wave converged by the converging body. An antenna device comprising: a receiving unit for receiving and / or a transmitting unit for radiating a radio wave toward the converging body. 2. The arranging body is a window glass plate disposed in a building, the converging body is configured in a flat shape, and the converging body is inclined with respect to the arranging body. The antenna device according to 1. 3. The antenna device according to claim 1, wherein the thickness of the arrangement satisfies the following expression (1) with respect to the wavelength of the radio wave and the incident angle of the radio wave. [Equation 1] 4. A transparent planar arrangement, an antenna body for transmitting and / or receiving radio waves, and a matching body provided between the arrangement and the antenna body. An antenna device, wherein the thickness of the arrangement satisfies the following expression (2) with respect to the wavelength of the radio wave and the incident angle of the radio wave. [Equation 2]