JP2000209024A - Coaxial feeding type array antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an array antenna which can reduce its loss with a lightweight structure and also to provide a plane antenna having the radiation elements in a plane form using the array antenna. SOLUTION: This array antenna consists of a coaxial line 1 including an inner conductor 11 and an outer conductor 13 which is formed on the outer circumference of the conductor 11 via a dielectric 12, plural coupling ropes 2 which are inserted into the dielectric 12 at one of both ends of every rope 2 from the outside of the conductor 13 in the axial direction of the line 1 and with no touch to the conductor 13, the radiation elements 3 which are unified with the ropes 2 or connected to the ropes 2 at the other end of every rope 2 and a feeding part 4 which is added to the line 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aperture antenna fed by a coaxial line, and more particularly to an array antenna in which radiating elements are linearly or planarly arranged. For more information,
The present invention relates to an array antenna having a small and lightweight power supply circuit capable of extremely reducing signal radio wave attenuation and maintaining a high level of antenna characteristics such as directivity.

[0002]

2. Description of the Related Art As a conventional aperture antenna, a parabolic antenna whose surface is formed in a parabolic shape is used, as typified by a parabolic antenna. However, such a parabolic antenna has a three-dimensional structure and a large shape,
Because of the problem that the aperture ratio is poor, a linear or planar array antenna in which radiating elements are arranged in a straight line or in a matrix has recently been put to practical use as an alternative to this parabolic antenna.

Conventionally considered planar array antennas include, for example, a strip line radiator as shown in FIGS. 10A and 10B and a strip line radiator as shown in FIGS. 11A and 11B. A slot type that radiates radio waves from a large number of slits 57 provided on a metal wall forming the cavity 58 has been considered. The strip line radiator is provided with patch antennas 51 arranged in a matrix on a dielectric substrate 52 having a ground plate 53 on the back surface. In order to supply power to each patch antenna 51, a dielectric 54 is further provided on the back of the ground plate 53. A strip line 55 is formed via
Power is supplied from the strip line 55 through the coupling pin 56. In the slot type, power is supplied to a radial waveguide 58 by a coupling pin 59 insulated, and an electromagnetic wave in the cavity is radiated through a slit 57. In addition, as shown in FIG. 11C, a structure in which a part of the radiating element 60 is inserted into the hollow portion 58 without direct radiation from the slit and coupled with an electric field in the hollow portion 58 to extract energy. There are also things. In this case, the radiating element 60 depends on the strength of the electric field in the cavity 58.
By changing the insertion depth, the radiated power is adjusted.

[0004]

The conventional strip line type has a dielectric loss and deteriorates antenna characteristics, so that a high gain and high precision antenna cannot be obtained. In the case of the slot type, a slit is formed in the metal plate. However, the control range of the radiated power from the slit is narrow and there are many design restrictions. , Changes must be made to perform the trial production many times. Even if an optimal design value is obtained, it is difficult to obtain a sufficiently optimum antenna performance due to manufacturing variations.

Further, in the case of using a cavity, since the electric field distribution in the cavity varies depending on the radiating element, the radiated power from the radiating element cannot be easily set to a required value. Furthermore, with these conventional array antennas, it is not possible to precisely adjust the magnitude and phase of each output of each radiating element. Although it is good as an antenna for applications that do not cause inconveniences, for example, as an antenna such as an automatic toll collection system on a highway, where an area where communication should be performed in a narrow area and an area where communication should not be performed are separated, side antennas Strict antenna characteristics such as a radiation pattern with a low lobe level are required, and there is a problem that a conventional array antenna cannot provide an antenna that sufficiently satisfies the requirements.

In order to solve such a problem, the present inventors use a ridge waveguide as a feed circuit to reduce the size of the waveguide, and combine the waveguide with a radiating element to reduce loss. An array antenna having stable antenna characteristics was invented and disclosed in Japanese Patent Application No. 10-124295.
According to the power supply circuit that supplies power using such a ridge waveguide, a low-loss power supply circuit can be realized. However, even with a small-sized waveguide having a ridge structure, the weight of the waveguide is heavy. It is desired to reduce the weight.

The present invention has been made to solve such a problem, and an object of the present invention is to provide an array antenna having a light weight structure while reducing a loss.

Another object of the present invention is to provide an array antenna capable of reliably coupling an electric field to each radiating element while adjusting the spacing between the radiating elements according to antenna characteristics.

It is still another object of the present invention to provide a planar antenna having a planar radiating element using the array antenna.

Still another object of the present invention is to transmit and receive orthogonally polarized signals such as right-handed and left-handed polarized waves or horizontal and vertical polarized waves with one antenna. It is another object of the present invention to provide a planar array antenna which can transmit and receive signals of different frequency bands with one antenna.

[0011]

An array antenna according to the present invention comprises: a coaxial line comprising an inner conductor and an outer conductor provided on the outer periphery thereof through a dielectric; and a coaxial line extending from the outside of the outer conductor in the axial direction of the coaxial line. A plurality of coupling probes each having one end inserted into the dielectric so as not to contact the outer conductor; a radiating element provided integrally with or connected to the other end of the coupling probe; It consists of a feeder provided on the line.

[0012] With this configuration, since the coupling probe is inserted into the coaxial line in which a dielectric is interposed between the inner conductor and the outer conductor, a thick metal such as a waveguide is used. It is not necessary to use a plate, and a very lightweight array antenna can be obtained. Moreover, the coaxial line has a loss as small as that of the waveguide, and the coupling probe can be coupled at a place where the electric field of the standing wave formed in the coaxial line is strong. Thus, a low-loss array antenna can be obtained.

[0013] The plurality of coupling probes are provided so as to be located at the peaks of the standing wave formed on the coaxial line, and the permittivity of the dielectric is adjusted to adjust the coupling probe. By setting the interval,
The distance between the radiating elements according to the desired antenna characteristics can be set while the coupling is performed at a strong electric field in the coaxial line.

A conductor (conductor piece) is provided at the one end of the coupling probe, and the degree of coupling can be adjusted by adjusting the size of the conductor. Here, the conductor (conductor piece) means a conductive column attached to one end of the coupling probe or a conductive disk attached to the tip of the coupling probe, and changes its outer diameter. Thereby, the degree of coupling can be adjusted.

By bringing one end of the coupling probe into contact with the inner conductor of the coaxial line, the frequency of the transmission / reception signal is increased, and even if the characteristics change due to a slight dimensional change such as the insertion depth, A stable coupling degree can be obtained. In this case, by adjusting the thickness of the inner conductor at the portion where one end of the power supply probe contacts,
The degree of coupling can be adjusted.

A plurality of coaxial lines are arranged in parallel, and a second coaxial line extending in a direction intersecting with the plurality of coaxial lines arranged in parallel to supply power to each feeder of the plurality of coaxial lines. A plurality of second coupling probes provided on the second coaxial line are directly provided as feed portions of the plurality of coaxial lines, or are respectively connected to the feed portions; By providing the line with the second feeder which can be connected to an external circuit, a planar antenna can be obtained.

A radiating element coupled to the plurality of coaxial lines is formed for transmitting / receiving a signal of a first polarization or a first frequency band, and a polarization or a second frequency band orthogonal to the polarization. A plurality of third coaxial lines to which a second radiating element capable of transmitting and receiving the third coaxial line is coupled, the first coaxial line and the third coaxial line are alternately arranged, and the third coaxial line is arranged. Fourth coaxial lines for supplying power to the lines are provided so as to extend in a direction intersecting with the plurality of third coaxial lines, thereby transmitting and receiving signals of a plurality of polarizations or signals of a plurality of frequency bands. The resulting planar antenna can be configured using a low-loss coaxial line. The orthogonal polarization may be, for example, a combination of right-handed circular polarization and left-handed circular polarization in circular polarization, or a combination of horizontal polarization and vertical polarization in linear polarization. As the first and second frequency bands, for example, a system for transmitting (12 GHz) and receiving (14 GHz) of a communication satellite small earth station (VSAT) and a system for transmitting and receiving signals differently from a subscriber wireless access system are used. And so on.

[0018]

Next, an array antenna of the present invention will be described with reference to the drawings.

FIG. 1A is a perspective view showing an example of a linear array antenna in which radiating elements 1 are arranged in a line, and FIGS. 1B to 1C show the BB line. , C
As shown in the sectional explanatory view of a part of the -C line,
A coaxial line 1 having an inner conductor 11 and an outer conductor 13 provided on the outer periphery thereof via a dielectric 12, and an inner conductor 11 is provided so as not to contact the outer conductor 13 from outside the outer conductor 13 in the axial direction of the coaxial line 1. , A radiating element 3 provided integrally with the coupling probe 2 or connected to the other end thereof, and a feeder 4 provided on the coaxial line 1. It consists of

The coaxial line 1 includes a normal inner conductor 11 and an outer conductor.
13 are provided concentrically at regular intervals via the dielectric 12.
Fig. 1 shows a cross section of a square shape.
Things are shown, but polygons that are circular or larger than squares
Shape may be sufficient. The inner conductor 11 is, for example, an aluminum rod.
(Wires) and materials with good electrical conductivity such as copper rods (wires)
The cross-sectional shape is determined according to the cross-sectional shape of the outer shape.
Things are used. The outer conductor 13 is also made of aluminum or copper.
Any plate or coating can be used. Dielectric 12
Is similar to ordinary coaxial lines, for example, Teflon or poly
Ethylene or the like can be used. It may be air,
In order to hold the inner conductor 11 firmly
Is preferred because the dielectric 12 is more stable.
No. The relationship between the inner conductor 11 and the outer conductor 13 is based on this coaxial line.
1 characteristic impedance Z₀Affects the outside of the inner conductor 11
A circular section between dimension C and inner dimension B of the outer conductor
Assuming that₀= 138 · (ε_r ^-1/2) · Log
(B / C). Also, the cutoff frequency of the higher order mode
Number f_cAnd the cutoff wavelength corresponding to the cutoff frequency is λ
_c, The relative permittivity of the dielectric 12_rThen, B + C = λ
_c/ 2 · ε_r ^-1/2Relationship exists. Therefore,
Characteristic impedance Z₀And send and receive
The frequency f of the signal is f <f_cB + C is determined so that
Can be Relative dielectric constant ε of this dielectric 12_r(If it is air
1.0, 2.0 if Teflon mentioned above, coaxial line
Wavelength λ in road_gGives the wavelength in free space as λ₀Then
λ_g= Ε _r ^-1/2・ Λ₀To be transmitted.

As a specific dimension, in the case of a square shape as shown in FIG. 1, for example, the cutoff wavelength λ _c is 3.9 G
Hz, B = 21 mm, C = 6 mm, and Z ₀ = 49
Ω is formed. Also, the relative permittivity ε _{r of the} dielectric 12
Is the wavelength λ in the coaxial line so that the position of the interval between the desired radiating elements is a portion where the electric field of the standing wave is high as described later.
_The setting is made so that _g can be adjusted, and the material of the dielectric 12 is selected so as to have the dielectric constant.

The radiating element 3 is formed of metal in an antenna shape, and as shown in FIGS. 4A to 4D, a curl element, a spiral element, a helical element, a zigzag element (in a plane). (Returned antenna element). Various radiating elements for right-handed circularly polarized light, left-handed circularly polarized light, and linearly polarized light can be obtained depending on the shape. The radiating element 3 is integrated with the coupling probe 2 or connected to the coupling probe 2 and is coupled to the coaxial line 1 via the coupling probe 2 having one end inserted into the coaxial line 1. ing. The coupling probe 2 is made of phosphor bronze, for example, and as shown in FIG.
It is provided in a place where the electric field of W is strong, and the degree of coupling changes depending on the insertion depth A. The deeper the insertion, the stronger the coupling. On the one hand, the distance L between the coupling probes 2 is regulated by the period of the standing wave, and on the other hand, as described later, the distance between the radiating elements 3 is determined by antenna characteristics. Means for positioning the coupling probe 2 at a location where the electric field of the standing wave SW is strong while obtaining the interval between the radiation elements 3 according to the antenna characteristics will be described later.

As described above, the radiation power of the radiating element 3 is determined by its insertion depth A, and one element of the antenna characteristic is determined. As another element that determines the antenna characteristic, the initial phase of each radiating element is desired. Must be adjusted to obtain the antenna characteristics of For example, by matching all of the initial phases, a sharp beam is obtained.
When a right-handed circularly polarized antenna is formed using a curl element, as shown in a top view in FIG. 3, by sequentially changing the angle at which the adjacent radiating element 3 starts to rotate from the coupling probe 2, The initial phase can be changed sequentially. Even if it is not a curl element, the aforementioned spiral element,
Similarly, in a helical element or the like, the phase can be changed by sequentially changing the first folded portion.

As described above, the interval between the radiating elements 3 is set according to the antenna characteristics. That is, for example narrow when used to communicate with such a range, approximately 0.5～0.7Ramuda ₀ spacing of the radiating elements 3 in order to reduce the side lobes of the radiation pattern of the antenna (lambda ₀ is the free space wavelength ). On the other hand, it is preferable that the coupling probe 2 connected to the radiating element 3 is inserted in a place where the electric field of the standing wave is strong in the waveguide. Insertion into a place where the electric field is weak is not preferable because the insertion depth of the coupling probe 2 must be increased, and the impedance in the coaxial line is disturbed. The standing wave described above has a wavelength λ _g in the coaxial line.
When, for example, Teflon is used for the dielectric layer 12, since ε _r = 2, λ _g = 0.707
lambda _0, and the or to insert lambda _g become for every two peaks of the standing wave interval, by adjusting the relative permittivity of the dielectric layer 12, can be adjusted to a desired spacing.

In the example shown in FIG. 1, a connector is provided at one end of the coaxial line 1 to serve as a power supply unit 4. The inner axis of this connector is attached so as to be connected to the inner conductor 11, and a coaxial cable is connected to the connector so that a signal for transmission is supplied to the array antenna or received by the array antenna. The signal can be transmitted to the processing circuit side.

In the example shown in FIG. 2, the coupling probe 2 is inserted shallowly into a place where the electric field of the standing wave is strong. Since the reflection by the coupling probe can be reduced by such a shallow insertion in a place where the electric field is strong, the electric field is preferably not disturbed. However, as the frequency band becomes higher, the dimensions become smaller, and the degree of coupling changes greatly even with a slight deviation of the insertion depth. In order to solve such a problem, for example, as shown in FIG. 5, another example of a coupling method of a coupling probe is shown (in FIG. 5, for convenience, different coupling methods are successively written on one coaxial line). A conductor (conductor piece) such as a conductive disk 21 or a conductive cylinder 22 is provided at one end on the insertion side of the coupling probe, and the area of the coupling portion is increased to increase the electric field. If the connection is made at a weak point, the connection is made over a wide area, so that even if a slight positional shift occurs, a change in the degree of connection does not appear so much. In this case, the degree of coupling can be adjusted by changing the size (outer diameter) of the disk 21 and the thickness of the cylindrical body 22.

Further, one end of the coupling probe 2 may be brought into contact with the inner conductor for coupling. Such contact eliminates the problem that the degree of coupling varies depending on the insertion depth. As a method of adjusting the degree of coupling in this case, as shown in FIG. 6 (in FIG. 6, radiating elements are written at a small interval for explanation, but actually provided at a predetermined interval). By changing the thickness of the conductor 11, the degree of coupling can be changed even in the same contact state. That is, when the thickness of the inner conductor 11 changes,
The characteristic impedance of the coaxial line at each stage changes,
The degree of coupling can be adjusted. By making such contact, the coupling state can be stabilized, and a very stable coupling degree can be obtained even when the frequency band becomes higher. In FIG. 5, reference numeral 23 denotes an insulator for preventing the coupling probe 2 from contacting the outer conductor 13. In FIGS. 5 and 6, the same parts as those shown in FIG. It is. Further, various coupling methods shown in FIG. 5 can be used in combination.

Next, an example in which a two-dimensional planar antenna is formed using the coaxial feed type array antenna will be described. FIG. 7A is a perspective explanatory view of one embodiment, and FIG. 7B is a sectional explanatory view taken along the line BB.

In this example, the linear array antennas using the coaxial lines shown in FIG. 1 are arranged in parallel. In this example, the outer conductor portion on the upper surface of the coaxial line 1 is removed, and the coaxial line is shared by a plurality of coaxial lines. The outer conductor on the upper surface is removed from the back surface of the metal plate 15 so as to be closed by one metal plate 15 of the first type.
A plurality of coaxial lines 1 are attached in parallel. Further, a through hole is provided in a mounting portion of the radiating element 3 of the metal plate 15, one end of the coupling probe 2 is inserted into the dielectric layer 12 of the coaxial line 1, and the other end of the coupling probe 2 is radiated. An element 3 is provided. Therefore, the structure of the part of the array antenna in which the radiating element 3 is coupled to one coaxial line 1 is the same as the example shown in FIG. 1 described above. In this example, a plurality of the array antennas are arranged in parallel. And a second coaxial line 5 on the back side of the first coaxial line 1, for example, a first coaxial line so that power can be supplied to the plurality of coaxial lines 1. 1 is provided so as to cross (orthogonalize) the central portion. The power supply unit 4 including a connector is provided at one end of the second coaxial line 5. Then, a second coupling probe 22 is provided so as to be connected to the dielectric layers 12 of the first and second coaxial lines 1 and 5, so that the power is supplied to the first coaxial line 1. Has become.

That is, power is supplied from an external circuit via the power supply unit 4 and is coupled to the second coaxial line 5, and a plurality of lines are provided between the second coaxial line 5 and the plurality of first coaxial lines 1. Second
Are respectively bound by the binding probes 22 of
Is supplied to the coaxial line 1. The strength of this connection can also be freely set by adjusting the penetration depth of the second connection probe 22. As a result, the first
A signal can be radiated or received from a radiating element 3 provided in combination with each of the coaxial lines 1.

In the example shown in FIG. 7, the radiating elements 3 are provided side by side on the metal plate 15, but by covering the periphery of each radiating element 3 with a rectangular or circular metal wall (not shown). As a cavity, the radiating element 3 is present in the cavity, and becomes a propagation mode in the waveguide, so that the electromagnetic field distribution on the cavity opening surface becomes uniform. That is, in an element antenna utilizing a phase change depending on the rotation direction of a curl element or the like, there is a problem that the characteristics in the θ direction fluctuate from the direction of the coupling probe, but a metal wall is provided around the radiation element 3. As a result, the individual characteristics of the radiating elements become constant, and the amplitude and phase of the individual radiating elements 3 become constant regardless of the elevation angle.
Further, there is no interaction between the adjacent radiating elements 3, and the antenna characteristics are greatly improved.

Although FIG. 7 shows a diagram in which four coaxial lines are juxtaposed, n coaxial lines can be juxtaposed so that the required antenna characteristics can be obtained. Further, a matching circuit (not shown) is provided on the power supply unit 4 side in the same manner as described above.

By using a coaxial line as a feed circuit to the radiating element, the distance between the radiating elements 3 can be freely set by adjusting the relationship between the inner conductor and the outer conductor and the permittivity of the dielectric. Therefore, the spacing between the radiating elements provided on the coaxial lines arranged side by side can be freely adjusted in accordance with desired antenna characteristics. As a result, the spacing between the radiating elements can be set according to the antenna characteristics, and the power of each radiating element can be freely set by adjusting the insertion depth of each coupling probe. The initial phase between the radiating elements can be adjusted by the mounting angle of the radiating elements. As a result, a planar antenna having desired antenna characteristics can be obtained.

FIG. 8 is an explanatory view similar to FIG. 7A of still another embodiment of the planar antenna. This example is an example in which antennas having different polarization planes are provided so that, for example, both right-handed and left-handed polarized waves can be transmitted or received. In this case, the right-handed circularly polarized wave is 12 GHz,
The left circularly polarized wave may be in a band different from 14 GHz. That is, for example, a right-handed antenna array in which radiating elements 3 for right-handed circular polarization are arranged in the first coaxial line 1,
A left-handed array antenna in which radiating elements 9 for left-handed circular polarization are arranged and coupled to the third coaxial line 7 is arranged alternately. A second coaxial line 5 for supplying power to the first coaxial line 1 and a fourth coaxial line 8 for supplying power to the third coaxial line 7 are connected to the first and third coaxial lines 2, respectively. 7 is provided so as to be orthogonal. Although not shown, the second and fourth coaxial lines 5 and 8 are provided with connectors as described above, so that power can be supplied to an external circuit.

In the present invention, since the coaxial line is used, the cutoff frequency and the wavelength in the coaxial line can be adjusted by adjusting the inner conductor, the outer conductor, and the dielectric layer therebetween. As a result, for example, even if the left-handed and right-handed are alternately arranged in this way,
It can be arranged at intervals of 0.7～0.9Ramuda ₀ right旋用between each independently. In this configuration, particularly in the case of an antenna for receiving satellite broadcasts, characteristics such as side lobes do not cause much problem, and the antenna for which only gain is required does not need to be so narrow in the interval. It is effective.

In the example shown in FIG. 8, the right-handed radiating element 3 and the left-handed radiating element 9 are arranged so as to be shifted from each other. As shown in FIG. 8, it is preferable that the right-handed and left-handed ones are shifted from each other because the distance between the radiating elements is increased and the mutual influence can be reduced. Therefore, the second and fourth coaxial lines 5 and 8 for power supply can also supply power to the central portions of the first and third coaxial lines 1 and 7 while being arranged side by side as shown in FIG.

In the above-described example, the transmission and reception of orthogonal circular polarizations for right-handed circular polarization and left-handed circular polarization are performed. However, for horizontal polarization and linear polarization of linear polarization, etc. Antenna for orthogonal polarization. The first for the same polarization
The radiating elements 3 and 9 of the third coaxial line can be used for different frequency bands. Further, in the example shown in FIG. 8 as well, the radiating elements 3 and 9 are not surrounded by a metal wall, but each radiating element is surrounded by a metal wall as described above to eliminate the influence of the mutual radiating elements. Can be done,
The problem associated with the asymmetry of the radiation characteristic with respect to the inclination angle of the radiating element from the normal direction can be solved.

Further, in the above-described example, power is supplied to the first or third coaxial lines 1 and 7 at the centers thereof. it can.

In each of the above embodiments, the radiating element 3 is provided only on one surface of the coaxial line having a rectangular cross section.
As shown in (a) and (b), for example, the radiating element 3 can be provided on two or more surfaces of the rectangular coaxial line 1. By providing each surface in this manner, it is possible to transmit radio waves in all directions and receive radio waves from all directions. Also, the cross-sectional shape of the coaxial line is not limited to a square shape, but may be formed in another square shape such as an octagonal shape, or may be circular. Even when the cross-sectional shape is circular, the radiating elements 3 can be provided in various circumferential directions as shown in FIG. 9C.

[0040]

According to the present invention, since a coaxial line is used, a very small and lightweight array antenna can be constructed. Moreover, since the transmission line is a coaxial line, the power supply circuit can be configured with low loss. Therefore, with high characteristics,
In addition, a small and lightweight aperture antenna can be obtained.
As a result, for example, an antenna having a small side lobe, a high gain, and a radiation pattern with good directivity is obtained, and is applied with high reliability to transmission and reception in a narrow range such as an automatic toll collection system by an unmanned highway car. be able to.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of one embodiment of an array antenna of the present invention.

FIG. 2 is an explanatory diagram of an insertion position of a coupling probe when coupling a coaxial line and a radiating element.

FIG. 3 is an example of a shape when curl elements as an example of a radiation element are arranged.

FIG. 4 is a diagram showing an example of the shape of a radiating element.

FIG. 5 is an explanatory diagram showing another example of a method of coupling a coupling probe.

FIG. 6 is an explanatory diagram of a method of adjusting a coupling degree when a coupling probe is brought into contact with an inner conductor of a coaxial line.

FIG. 7 is an explanatory diagram of an example in which a planar antenna is configured using the array antenna of FIG. 1;

FIG. 8 is an explanatory diagram showing another example of the configuration of the planar antenna.

FIG. 9 is an explanatory cross-sectional view of another embodiment of the array antenna of the present invention.

FIG. 10 is a diagram showing an example of a planar array antenna using a conventional patch element.

FIG. 11 is a diagram illustrating an example of a planar array antenna using a conventional cavity.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coaxial line 2 Coupling probe 3 Radiating element 4 Feeding part 11 Inner conductor 12 Dielectric 13 Outer conductor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mitsuhiro Suzuki 7-5-11 Takinogawa, Kita-ku, Tokyo Inside Yokoo Corporation (72) Inventor Hironori Okado 7-5-11, Takinogawa, Kita-ku, Tokyo Stock Association (72) Inventor Migiwa Beniya 7-5-11 Takinogawa, Kita-ku, Tokyo F-term (reference) 5J021 AA05 AA07 AA09 AB02 CA01 FA00 JA07

Claims (8)

[Claims] 1. A coaxial line comprising an inner conductor and an outer conductor provided on the outer periphery thereof with a dielectric interposed therebetween, and said coaxial line extending from the outside of said outer conductor in the axial direction of said coaxial line so as not to contact said outer conductor. Coaxial power supply comprising: a plurality of coupling probes, one ends of which are inserted into the coupling probe; a radiating element provided integrally with or connected to the other end of the coupling probe; and a power supply unit provided on the coaxial line. Type array antenna. 2. The coupling probe according to claim 1, wherein the plurality of coupling probes are provided at a peak of a standing wave formed on the coaxial line, and the coupling is performed by adjusting a dielectric constant of the dielectric. 2. The array antenna according to claim 1, wherein an interval between the probes is set. 3. The array antenna according to claim 1, wherein a conductor is provided at the one end of the coupling probe, and the degree of coupling is adjusted by adjusting the size of the conductor. 4. The coaxial feed array antenna according to claim 1, wherein one end of the coupling probe is brought into contact with an inner conductor of the coaxial line. 5. The coaxial feed type array antenna according to claim 4, wherein the degree of coupling is adjusted by adjusting the thickness of the inner conductor at a portion where one end of the power supply probe contacts. 6. A plurality of coaxial lines are arranged in parallel,
A second coaxial line extending in a direction intersecting with the plurality of coaxial lines arranged in parallel is provided to supply power to each of the power supply units of the plurality of coaxial lines, and is provided on the second coaxial line. A plurality of second coupling probes are directly provided as feed sections for the plurality of coaxial lines, or are connected to the feed sections, respectively, and the second coaxial line is provided with a second feed section which can be connected to an external circuit. The array antenna according to claim 1, wherein the array antenna is formed as a planar antenna. 7. A radiating element coupled to the plurality of coaxial lines is formed for transmitting and receiving a signal of a first polarization, and a second radiation capable of transmitting and receiving a signal of a polarization orthogonal to the polarization. A plurality of third coaxial lines to which elements are coupled are formed,
And a third coaxial line are alternately arranged, and a fourth coaxial line for supplying power to each of the third coaxial lines extends in a direction intersecting the plurality of third coaxial lines. The array antenna according to claim 6, which is provided. 8. A radiating element coupled to the plurality of coaxial lines is formed for transmitting and receiving signals in a first frequency band, and transmits and receives signals in a second frequency band different from the first frequency band. A plurality of third coaxial lines to which the obtained second radiating elements are coupled are formed, the first coaxial lines and the third coaxial lines are alternately arranged, and power is supplied to each of the third coaxial lines. 7. The array antenna according to claim 6, wherein a fourth coaxial line is provided to extend in a direction intersecting the plurality of third coaxial lines.