JPS6162206A - Array antenna with cylindrical radio wave lens - Google Patents

Abstract

PURPOSE:To improve both the cross polarized wave characteristic and the beam shaping and to attain low cost by combining beams in a vertical plane by means of an array antenna and combining beams in a horizontal plane by means of a cylindrical ratio wave lens. CONSTITUTION:The titled antenna consists of an array antenna 40 of waveguide slot type as a radiator and a cylindrical radio wave lens comprising partial cylindrical radio wave lenses 50, 51, 52. The cylindrical axis of the radio wave lenses 50, 51, 52 is arranged in parallel with the X axis and the entire part is symmetrical with respect to the XZ plane. A focal line 53 is a line near to the X axis and in parallel therewith. The slot provided to the antenna 40 is excited by a current of a waveguide, the amplitude is adjusted mainly by the size S and the relative exciting phase between slots is adjusted mainly by the size L. Thus, in using an element having excellent cross polarized wave identification as each radiation element, no cross polarized are component is included basically in the wave source and beam shaping is attained. Thus, an excellent cross polarized wave characteristic is obtained even when the cross polarized wave component included in the wave source is not cancelled at all.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an array antenna in wireless communication.

In particular, the present invention relates to a shaped beam antenna in which the shape of the radiation beam has a fan-shaped spread in a certain plane, and in a plane orthogonal thereto, the beam shape differs from the plane.

INDUSTRIAL APPLICABILITY The present invention is used for wireless communication between one master station and a plurality of slave stations.

[Conventional technology]

In normal wireless communication, two wireless stations face each other and communicate, so the antennas used generally have high gain and low sidelobe characteristics. However, when communicating between multiple slave stations scattered within a certain area and one master station, the antenna of the master station efficiently covers the area where the slave stations are scattered (
It is necessary to have a so-called shaped beam of irradiation.

FIG. 9 is a plan view in which a master station and a slave station for wireless communication are arranged, and FIGS. 10 and 11 are side views thereof,
The effect of beam shaping will be explained using these. In other words, when station A is the master station and stations B, C1D, and E are slave stations, the beam shape of the antenna of the master station has all the slave stations in the horizontal plane as shown by the broken line 1 in Figure 9. It is desirable to have a fan-shaped spread that covers the station. on the other hand,
In the vertical plane, as shown in Figs. 10 and 11, due to the difference in ground height where the slave stations are placed and the difference in distance from the master station, the beam becomes more symmetrical than the normal pencil beam as shown by the broken line 2 in Fig. 10. It is desirable to have a shaped beam as shown in broken line 3 in FIG.

FIG. 12 is a plan view when the communication ranges of the master station and slave station shown in FIG. 9 are arranged adjacent to each other. In such a case, in order to prevent shaped beams 1 and 1' from interfering, polarized waves orthogonal to each other are used, and the degree of orthogonality of the polarized waves, that is, the quality of the cross-polarized wave characteristics of beams 1 and 1' is determined. This will directly affect the quality of the line.

Conventionally, the method of synthesizing such shaped beams is as follows:
For example, a patent application filed by the same applicant in 1974-1074
A radio wave lens antenna such as No. 41 (unpublished at the time of filing) was considered. FIGS. 13 and 14 show a perspective view and a cross-sectional view on a horizontal plane of this conventional antenna.

In Figure 14, the radio wave lens is located at the center of one lens.
1 and two end portions, and is supplied with power by a -order radiator 12. Radio wave lens 10 both surfaces S in the center.

T1 are both concentric circles centered on point F, and radio lenses 2 and 3 at both ends have central axes P2 and P, respectively.
It is a radio wave lens for focusing radio waves with the central axis as the 15th
This is a part of a radio wave lens formed by rotating the cutting line shown in FIG. 17 around axis P2 or axis P. Therefore, among the radio waves emitted from the -order radiator 12, the radio waves that enter the radio lens 1 in the center pass through the path shown by broken lines 24 and 25, and are radiated in the horizontal plane without being affected by the refraction of the radio lens. .

In addition, the radio waves incident on the radio wave lenses 2 and 3 at both ends pass through the radio wave paths shown by broken lines 26.27 and 28.29.
They are emitted as plane waves traveling in the directions of central axes P2 and P3, respectively.

Therefore, the overall radiation characteristics are almost flat in the horizontal plane within the range of the divergence angle of the radio wave lens 1, and at both ends of the divergence angle, energy is concentrated at both ends, and energy is concentrated at both ends of the divergence angle. A shaped beam with reduced unnecessary radiation can be synthesized. 15 to 17 are diagrams illustrating the specific structure of the lenses at both ends, and each of these diagrams shows a cutting line taken by a plane including the vertical axis and the central axis P2 in FIG. 14. In either case, this is an example of a radio wave focusing lens that converts a spherical wave arriving from point F into a plane wave traveling in the direction of its central axis P2, and broken lines 30 and 31 indicate examples of radio wave paths.

The example shown in FIG. 15 is a so-called elliptical lens, the surface S2 is an arc centered on point F, and the surface T2 is determined by equation (1). Similarly, the example shown in FIG. 16 is a so-called hyperbolic lens, and the surface S2 is a straight line perpendicular to the central axis P2 according to equation (2). FIG. 17 shows a so-called two-surface lens that utilizes refraction at both surfaces SZ and T2, and both surfaces are determined by equation (3). However, in formulas (1) to (3), ε is the refractive index, f
represents the focal length.

Surface T2 in Figure 7 r= f (g 71) / (a cosθ)
-(11 Surface S2 in FIG. 8 γ=(ε-1)f/(εcosθ-1> -421 Surface Sz, Tz in FIG. 9 γ dθ εcos(θ-θ')-1.

The radio lenses 2 and 3 at both ends are constructed by using parts of the lenses shown in FIGS. 15 to 17, which are rotated around central axes P2 and P3. Central radio lens 1
is the cut 1! shown in Figures 15 to 17! It is constructed by rotating the Ji line around a vertical axis, or it is constructed by rotating a cutting line as shown in FIGS. 18 and 20 around a vertical axis.

In the former case, since the entire lens has a symmetric structure with respect to the horizontal plane, only beams that are symmetrical with respect to the horizontal plane, as shown by the solid line 21 in FIG. 20, can be synthesized in the vertical plane.

In the latter case, as will be described later, the beam shape in the vertical plane can be shaped to be asymmetrical with respect to the horizontal axis, but the shape of the entire lens becomes asymmetrical with respect to the horizontal plane.

In FIG. 18, the cutting line is constituted by partial radio lenses 4.5 and 6. Each part of the radio lens is the 15th
Cut the radio wave focusing lens shown in the figure! A portion of the Jr line is mirror-shaped so that they share a focal point F, and their respective central axes are oriented toward the lens axis P and the direction P, respectively.

Therefore, the spherical wave radiated from the focal point F is represented by the broken line 33.3
The radio waves travel in the direction of the center axis of each radio lens with 4.35 as the radio wave path.

Therefore, the radiation characteristic in the vertical plane becomes a beam shape that is asymmetrical with respect to the horizontal plane, as shown by the solid line 23 in FIG.

In the configuration example shown in FIG. 19, the cutting line is composed of partial radio lenses 4 and 7. The partial radio wave lens 4 is a part of the cutting line of the radio wave focusing lens shown in FIG. 15, and its central axis coincides with the lens axis.

Therefore, the radio waves passing through this part are, for example, broken line 33.
It becomes a radio wave that travels by ;) 1 in the direction parallel to the lens axis, as shown in g. Both surfaces S7 and T of the partial radio wave lens 7? The idea is to radiate a desired amount of energy in a desired direction using refraction at can be used to determine surfaces S7 and T7.

In this case as well, the radiation characteristic in the vertical plane becomes a beam shape that is asymmetrical with respect to the horizontal plane, as shown by the solid line 23 in FIG. Note that in FIGS. 20 and 21, the cross-polarization characteristics are shown by solid lines 22 and 23', respectively, and this difference in characteristics occurs for the reasons described below.

As is well known, the radiation characteristic of a radio wave lens is that the electromagnetic field vector of the radio wave arriving from the primary radiator 12 passes through the radio wave lens.
- the surface opposite the secondary radiator (e.g. surface T1 in FIG. 14);
~T3) and the electromagnetic field vector E and 1 (from equation (4)
It is determined by using the equivalent electromagnetic current vectors M and J determined by as wave sources.

M=EXn, J=nXH-4
4, where n is the unit normal vector on the surface described above.

Here, E and ■ (and n each have three components in the rectangular coordinate system because the incident incoming wave is a spherical wave and the lens configuration is as described above, so M and J also have three components. 1, which defines the radiation characteristics of the lens.
, 11 and J themselves contain cross-polarized components, and the amount of main polarization and the amount of cross-polarized waves of the radiation characteristics are proportional to the magnitude of each component of J and M, respectively.

As mentioned above, the configuration of the radio wave lens antenna with the characteristics shown in FIG. 20 is symmetrical with respect to the horizontal plane, so even if J
Even if and M contain cross-polarized components, they cancel each other out on the horizontal plane, which is the plane of symmetry, and do not produce cross-polarized waves. However, since symmetry cannot be maintained on surfaces other than the horizontal plane, cross-polarized components remain. In the end, the characteristic becomes as shown by the solid line 22 in FIG. 20.

Furthermore, since the configuration of the radio wave lens antenna whose characteristics are shown in FIG. 21 is originally not symmetrical with respect to the horizontal plane, the cross-polarized components do not cancel each other out, making it impossible to obtain good characteristics as shown by the solid line 23.

[Problem to be Solved by the Invention 3] As explained above, in conventional radio wave lens antennas, when trying to improve cross-polarization characteristics in the horizontal plane, there are significant restrictions on beam shaping in the vertical plane; If an attempt is made to improve the beam shaping in the horizontal plane, there is a drawback that cross-polarization characteristics in the horizontal plane cannot be improved, and this poses a major problem in line design as shown in FIGS. 9 to 13.

Furthermore, even if cross-polarization characteristics as shown by the solid line 22 in FIG. 20 are achieved, the characteristics will deteriorate rapidly in areas other than the horizontal plane.
'When selecting a station, if there is a large difference in ground height between each station, it may become impossible to select a station if the difference in height of the actual terrain or buildings is considered, or a special tower must be installed separately. Other problems also arise.

Furthermore, creating a mirror surface with the configuration shown in Figures 13 to 15 is technically difficult, as it is difficult to form a complex three-dimensional surface, and the purpose of -j'' is to use expensive jigs and tools. In addition, the molding process itself requires a large amount of man-hours, making the antenna as a whole expensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide an antenna with a new structure that has good beam shaping characteristics and cross-polarization characteristics. An object of the present invention is to provide an inexpensive antenna that does not require special jigs and tools for manufacturing, requires a small number of manufacturing steps, and is inexpensive.

[Means for solving problems]

In the present invention, beam shaping in the vertical plane is synthesized by an array antenna without using a radio wave lens, and beam shaping in the horizontal plane is synthesized by a cylindrical radio wave lens placed in the radiation path of the radiating element of the array antenna. The antenna is characterized in that it utilizes the radiation characteristics of the antenna and the characteristics of the cylindrical radio wave lens to obtain an antenna with good cross-polarization characteristics and beam shaping.

That is, the present invention includes an array antenna in which a plurality of radiating elements are arranged on a rectangular plane, and a radio wave lens disposed in the radiation path of the radiating element of this array antenna, and the radio wave lens is provided with a cylindrical portion. In the array antenna with a cylindrical radio wave lens constructed by the structure,
9g) With the center of the rectangle of the array antenna as the origin, Y in the longitudinal direction of the rectangle.
Determine the axis, and define the Y-axis in the direction perpendicular to the rectangular plane, passing through the origin and approaching the cylindrical radio lens, and passing through the origin and Y
When the Y-axis is set in a direction perpendicular to the Y-axis and the Y-axis, the cylindrical radio lens has a cylindrical axis parallel to the Y-axis, symmetrical with respect to the XZ plane, and a curved shape convex in the Z-axis direction. , The radiating element of the array antenna has an excitation amplitude of YZ
The radiation element of the array antenna is arranged such that it is symmetrical with respect to a plane and its excitation phase is antisymmetrical with respect to the YZ plane. It is characterized in that it is arranged so as to be symmetrical with respect to the Y-axis on the XZ plane and asymmetrical with respect to the Y-axis on the XZ plane. - The cylindrical radio lens preferably includes a mounting structure for mounting on the array antenna.

[For production]

The array antenna and the radio lens that shapes this radiation beam make it possible to obtain a radiation beam that is symmetrical in the horizontal direction and asymmetrical in the vertical direction.

〔Example〕

FIG. 1 is a perspective view showing the structure of an apparatus according to an embodiment of the present invention. In this embodiment, a waveguide slot type array antenna 40 and a partially cylindrical radio wave lens 50, 51, 52 are used as radiators.
It is made up of a cylindrical radio wave lens.

The array antenna 40 has a rectangular surface on which the radiating elements are arranged, and a terminator 41 is connected to one end of the rectangular surface. The orthogonal coordinate axes x, y, and z each have their origin at the center of the aperture surface where the slot of the array antenna is provided. The Y-axis is defined in a direction perpendicular to the Y-axis.

The partial cylindrical radio wave lens 50, 51, 52 has its cylindrical axis, that is, the axis along which the cutting lines of each part of the radio wave lens on a plane perpendicular to this axis are always the same, arranged parallel to the Y axis, and the entire cylinder The shaped radio lens is symmetrical with respect to the XZ plane. The straight line 53 is a line close to and parallel to the Y axis.

Figure 3 is an enlarged view of a part of an array antenna, in which a plurality of elliptical slots as shown in the figure are provided on the so-called magnetic interface of the waveguide parallel to the tube axis, that is, the longitudinal direction. The radio waves traveling through the waveguide are radiated from each slot.

Each slot is excited by a current in the Y-axis direction flowing through the inner wall of the waveguide, and its amplitude mainly depends on the dimension in the X-direction between the slots as shown in Figure 3, and the relative excitation phase between each slot is It is mainly adjusted by the dimension S between the slot and the X axis shown in FIG.

For example, in FIG. 1, if the yz plane is a horizontal plane and the XZ plane is a vertical plane, the solid line 60 shown in FIG.
To explain the case where asymmetrical beams are synthesized around two axes, that is, the 0 degree axis in Fig. 5, the excitation amplitude of each slot is symmetrical with respect to the YZ plane, but the The phase is antisymmetric with respect to the YZ plane. Here, antisymmetric means that the absolute value of the phase is the same but the sign is reversed.

In the example of FIG. 5, the total number of lofts is 21, the amplitude and phase are as shown in the table up to the upper 10th slot, assuming that the excitation amplitude of the central slot is 1 and the excitation phase is 0 degrees.

Up to the 10th slot at the bottom of the table, only the phase of the values in the table is reversed in sign. In addition, the numerical example above is an example showing that beam shaping can be realized with an array antenna.
Other excitations are also possible. In this way, the solid line 60 in FIG.
When combining such beams, the excitation amplitude becomes symmetrical and the excitation phase becomes antisymmetrical with respect to the YZ plane.

FIG. 4 is a diagram showing another example of the configuration of the array antenna.

This example is an example using a printed array antenna.

In the figure, numerals 43, 46, and 47 are metal strips on the dielectric substrate 44, and numeral 45 is a gold attenuator. In the figure, the square strip 43 is a radiating element, and the metal strips 46, 47 are connected to this radiating element 1.1. j
This is a feeder line for feeding two orthogonal polarized waves. The metal strip IJ tube 46 is a power supply line whose electric field component is polarized in the X-axis direction, and the metal strip 47 is a power supply line whose electric field component is polarized in the Y-axis direction.
fFf 151'A. These are connected to connectors 48 and 49 whose input and output ends are fixed to the metal conductor 45, respectively. Connectors 48 and 49 each have four coaxial outer bodies connected to metal wings 45 and center conductors connected to metal strips 46 and 47.
It is connected to Uε and electrically coupled to the power supply line.

In this structure, the excitation amplitude and phase to each radiating element can be controlled by changing the strip widths of metal strips 46 and 47 and the line length.

The characteristics of hem forming using the above array antenna are as follows.
Unlike shaping using a mirror surface as explained in the figure, if elements with good cross-polarization discrimination are used as each radiating element, the wave source basically does not contain cross-polarization components, and beam shaping becomes possible. Therefore, as described in the explanation of FIGS. 16 and 17, good cross-polarization characteristics can be obtained even if the cross-polarization components contained in the wave source are not canceled using the symmetry of the main reflector. It has the great feature of being able to

Note that the present invention can be practiced using radiating elements such as dipole arrays and crossed dipole arrays in addition to the configurations shown in FIGS. 3 and 4 as the configuration of the array antenna.

FIG. 6 is a cutaway view on the YZ plane of the embodiment shown in FIG. 1, and FIG. 7 is a diagram illustrating radiation characteristics in the horizontal plane. In the example of FIG. 6, the screen of the partially cylindrical radio wave lens 50 is cut WA.
Ss. ,T. are both circular arcs centered on point Q, and the partially cylindrical radio wave lenses 51 and 52 have the point Q as the focal point and the first
This is a radio wave lens for focusing radio waves having a cutting line similar to that shown in Fig. 5. However, in FIG. 6, the central axis P of the partially cylindrical radio lenses 51 and 52. , P5□ are different from the Z axis and are set symmetrically with respect to the Z axis, and the point Q is the intersection of the straight line 53 and the YZ plane. Therefore, the partially cylindrical radio wave lens 50 is a concentric cylindrical ring having the straight line 53 as its center, and numerals 51 and 52 are cylindrical radio wave lenses for focusing radio waves whose focal line is the straight line 53.

Point Q often coincides with the origin, but specifically the phase center point of the radiation wave of the waveguide slot is selected. However, − is emitted from the waveguide slot j,,,l
Among the radio waves, the radio waves incident on the partially cylindrical radio wave lens 50 are radiated without being affected by the refraction of the lens, as shown by broken lines 70 and 71, and the radio waves enter the partially cylindrical radio wave lenses 51 and 52. and are incident on the dashed line 72, respectively.
．． 73 or 74.75, they are radiated in the direction of their respective central axes, and the overall radiation characteristics are determined as a composite wave of these waves.

On the YZ plane, the radio waves radiated through the path indicated by broken lines 70 and 71 have a concentric wavefront starting from point Q, and the maximum radiation direction is in the Z-axis direction. In general, radiation waves from a slot or a minute wave source such as the radiating element 43 in FIG. 4 exhibit radiation characteristics with a wide beam width within the same plane. On the other hand, since the wave front of the radio waves transmitted through the partially cylindrical radio lenses 51 and 52 is aligned in the direction of the central axis as described above, the beam width has a narrowed radiation characteristic in that direction. Furthermore, the antenna is
Considering that it is symmetrical with respect to the Z plane, j, &, then YZ
The in-plane radiation characteristic has a fan-shaped spread as shown by the solid line 61 in FIG. 7, resulting in a shaped beam that is symmetrical about the Z axis, that is, the angle of 0 degrees in the figure.

The beam shaping of the main polarization component has been explained above, and now the cross polarization characteristics will be explained.

As mentioned in the explanation of the cross-polarization discrimination of the prior art, after passing through each partially cylindrical radio wave lens, the electromagnetic field vectors E and I induced on the lens surface on the opposite side of the array antenna (are expressed by equation (4) Equation (4) is determined by x, y, and z, respectively.
Components, Jx, Jy, Jz and M, ,M, ,M,
Expression (5) is obtained.

J,=nYH2-n,H.

Jv = nz Hx - nx Hz Jz”nx Hv ny Hx MX=E, n2-E2n.

Mv=E2nX−EXn2 Mz = Ex ny - Ey nX ・・・－・・・－・・・(5) However, nx s ny, nz are the X and Y of n.

2 ingredients.

Furthermore, since the magnetic field vector H and the electric field vector E are in an orthogonal relationship, for example, if a radio wave whose main polarization is so-called vertical polarization, that is, whose electric field vector is oriented in the X-axis direction, is radiated from the array antenna, The incident electric field vector to each partial cylindrical radio wave lens has an E component, and the human electromagnetic field hector mainly has an EX component. This is because, as mentioned in the explanation of FIG. 5, the radiation waves from the array antenna originally have good cross-polarization characteristics.

On the other hand, the normal vector n of each partially cylindrical radio lens is characterized in that the n component is zero, as is clear from its composition.

Therefore, in this case, the induced current is JX=-n, H2-n2 I-r.

Jy = (12H, 嬌O J,=nXH1l#Q MX = E, n-En, = O My=EXn2 M2=EXn.

11------・-(6) becomes.

As is clear from this second (6), the current induced in the radio wave lens is mainly composed of the Y component of the main polarization, and the magnetic current is mainly composed of the X and Z components orthogonal to the Y component of the generated wave. Here, since the magnetic current source emits an electric field vector orthogonal to the wave source, the main component of the radiated wave source may be the main polarization component. Comparing this result with the explanation of antenna cross-polarization characteristics in the prior art, it is clear that an improvement in cross-polarization characteristics is expected. Furthermore, it can be explained that the cross-polarized wave characteristics when the main polarized wave is so-called vertically polarized wave, that is, the electric field vector is oriented in the X-axis direction, are also good based on the equation (6) and the same precept.

In addition, as an example of the method for beam shaping in the horizontal plane, the partially cylindrical radio wave lens is made into a cylindrical ring shape, but this is not a necessary condition of the present invention.
. It is also possible to use a bent line symmetrical about the Z-axis or a cut line of a radio wave focusing lens as the shape of the lens.Furthermore, as a radio wave focusing lens, not only the example shown in Fig. 15 but also the example shown in Figs. The example shown in the figure can also be used, and the number is not limited to the two shown in FIG. 6, but can be increased to three or more to increase the degree of freedom in beam shaping.
FIG. 8 is a perspective view showing another embodiment of the present invention, in which the cylindrical radio wave lens and array antenna of the embodiment of FIG. 55, which are connected at the left and right ends and the top and bottom ends, respectively. This example electrically physically shields unnecessary radiation waves from the array antenna in the horizontal and vertical directions to improve wide-angle radiation characteristics, and structurally supports the cylindrical radio wave lens. It has the effect of increasing its strength.

The above explanation uses the word "radiation" and is explained as if it were a transmitting antenna, but since the antenna of the present invention is reversible in the direction of propagation of radio waves, it can be applied to both transmitting antennas and receiving antennas. be able to.

〔Effect of the invention〕

As described above, by implementing the present invention, it is possible to realize an antenna with a good degree of beam forming and an excellent degree of cross-polarization discrimination. Furthermore, since the lens is cylindrical, it has the advantage that it can be manufactured at a lower cost than the complicated lenses of the prior art. The present invention can be used to great effect in antennas of master stations that need to perform wireless communications with a plurality of stations scattered in a certain area.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the structure of an apparatus according to an embodiment of the present invention. FIG. 2 is a front view of the above embodiment. FIG. 3 is an enlarged view of a portion of the array antenna. FIG. 4 is a perspective view of another structural example of the array antenna. FIG. 5 is an explanatory diagram of the radiation characteristics in the vertical plane of the antenna according to the above embodiment. FIG. 6 is a horizontal sectional view of the above embodiment. FIG. 7 is an explanatory diagram of radiation characteristics in the horizontal plane of the antenna according to the above embodiment. FIG. 8 is a perspective view of another embodiment of the invention. FIG. 9 is a plan layout diagram of a master station and slave stations that perform wireless communication. FIG. 1O is a vertical cross-sectional view of FIG. 9 using a pencil beam. FIG. 11 is a vertical cross-sectional view of FIG. 9 using a shaped beam. FIG. 12 is a plan layout diagram when the communication areas shown in FIG. 9 are adjacent to each other. FIG. 13 is a perspective view of a shaped beam antenna having a conventional structure. FIG. 14 is a horizontal sectional view of the conventional example. FIG. 15 is an explanatory diagram (first example) of a method for configuring a 7ili part or a central part lens. FIG. 16 is an explanatory diagram (second example) of a method of configuring the lens at the end or the center. FIG. 17 is an explanatory diagram (second example) of a method for configuring end or center lenses. FIG. 18 is an explanatory diagram (fourth example) of a method for configuring the central lens. FIG. 19 is an explanatory diagram (fifth example) of a method for configuring the central lens. FIG. 20 is an explanatory diagram of the radiation characteristics in the vertical plane of the conventional antenna (example of symmetrical waveform). FIG. 21 is an explanatory diagram of the radiation characteristics in the vertical plane of the conventional antenna (an example of an asymmetric waveform). 1-7...Partial radio lens, 10.10', 1
1.11', 21.22.23.23', 60.6
1...Radiation characteristics, 24-31.34-37.70-7
5...Radio wave path, 12...-order radiator, 40...
・Array antenna with waveguide slot, 41...
Terminator, 43.46.47...Metal strip knob, 4
4... Dielectric substrate, 45... Metal conductor, 48.49
... Connector, 50-52 ... Partial cylindrical radio wave lens, 53 ... Focal line, 54.55 ... Conductor side plate, pz
,P, ,l), ,P, ... center of lens @It
, sl~S3, S7, S,. , T I-T s, T7,
T. ...-Lens cutting °Ci), A, A' ... Master station, B,, B', C,, C', D,, D', E,, B'
...Slave station, FSQ...Lens focus, S,,L...
・Dimensions indicating slot spacing and position.

Claims (2)

[Claims] (1) An array antenna in which a plurality of radiating elements are arranged on a rectangular plane, and a radio wave lens arranged in a radiation path of the radiating elements of this array antenna, The radio wave lens has a cylindrical partial structure. In the array antenna with a cylindrical radio wave lens configured by, the center of the rectangle of the array antenna is the origin, the X axis is defined in the longitudinal direction of the rectangle, and the cylindrical radio wave is perpendicular to the plane of the rectangle and passes through the origin. If the Z-axis is set in the direction approaching the lens, and the Y-axis is set in the direction passing through the origin and perpendicular to the It has a symmetrical curved shape convex in the Z-axis direction, and the radiating element of the array antenna has an excitation amplitude of YZ
The radiation element of the array antenna is arranged so that it is symmetrical with respect to a plane and its excitation phase is antisymmetrical with respect to the YZ plane. 1. An array antenna with a cylindrical radio wave lens, characterized in that it is arranged so as to be symmetrical with respect to the Z-axis on the XZ plane and asymmetrical with respect to the Z-axis on the XZ plane. (2) The array antenna with a cylindrical radio wave lens according to claim (1), wherein the cylindrical radio wave lens includes a mounting structure for attaching it to the array antenna.