JP2007180800A - Method for manufacturing linear array antenna, and linear array antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply manufacture a horizontally polarized wave/horizontal surface non-directional linear array antenna having simple structure and small antenna width. <P>SOLUTION: A conductive plate 5 has a plurality of recessed parts 12 formed on one long side out of two long sides of a rectangular plane conductor and first and second strip plane conductors 3a, 3b branched via a plurality of branches; where the tips of the first strip plane conductor 3a are connected to respective recessed parts 12 one by one and the tips of the second strip plane conductor 3b are connected to the long side which is the opposite side to the connection parts of the first strip plane conductor 3a and the recessed parts 12 respectively one by one. The conductor plate 5 is bent along a plurality of bending lines 6 to 8 previously set in parallel with the long sides, the long side on the side having the recessed parts 12 and the long side on the side having no recessed part are joined with each other on portions having no recessed part to form a polygonal prism, a plurality of slots worked on the positions of the recessed parts 12 in the polygonal prism and two parallel lines present in the polygonal prism, having first and second strip plane conductors and capable of supplying power to the plurality of slots. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an antenna whose horizontal polarization is horizontal plane omnidirectional, and more particularly to a linear array for manufacturing a horizontal polarization horizontal plane omnidirectional antenna used in mobile communication base stations such as mobile phones and PHS. The present invention relates to an antenna manufacturing method and a linear array antenna.

  An antenna for a mobile communication base station may be required to have horizontal polarization non-directionality with horizontal polarization. In general, a plurality of element antennas are arranged vertically to form a linear array antenna, thereby obtaining a high gain antenna. Further, the beam direction is tilted several degrees or several tens of degrees from the horizontal direction according to the user's request. Furthermore, it is desirable that the lateral width of the antenna is as small as possible. Therefore, in many cases, mobile communication base station antennas are provided with a linear array antenna in a cylindrical radome with a small diameter.

  As a device for obtaining horizontal polarization horizontal plane omnidirectionality, there is a cylindrical slot array antenna in which a plurality of slots are fed by a coaxial line (see, for example, Non-Patent Document 1). Some cylindrical slot array antennas are fed by two parallel wires (for example, see Non-Patent Document 2).

1997 IEICE Communication Society Conference, B-1-41, Ando et al. “Examination of Horizontally Polarized Omnidirectional Diversity Antenna” Electronics pp.90-93 Feb. 1947 E. C. Jordan et al. “Slotted-cylinder antenna”

  Among the horizontal polarization horizontal plane omnidirectional antennas described above, the cylindrical slot array antenna fed by the coaxial line has a complicated power distribution configuration in the coaxial line when a large number of slots are provided in order to obtain a high gain. There is a problem that the circuit configuration becomes complicated.

  In addition, the cylindrical slot antenna with two parallel wires has a problem that it is difficult to manufacture.

  The present invention has been made to solve the above-described problems, and a linear array antenna capable of easily manufacturing a horizontal polarization horizontal plane omnidirectional linear array antenna having a simple structure and a small antenna lateral width. The object is to obtain a method and a linear array antenna.

  The method for manufacturing a linear array antenna according to the present invention includes a plurality of concave portions provided on one long side of two long sides of a rectangular planar conductor, and a first strip plane branched through a plurality of branches. A second strip plane conductor branched through a plurality of branches, and a tip of the first strip plane conductor is connected to each of the plurality of recesses, and the second strip A plurality of preset bends parallel to the long sides, each of which is connected to the long side opposite to the connecting portion between the first strip flat conductor and the recess, respectively Bending along the line, joining the long side of the rectangular conductor flat plate on the side having the concave portion and the long side on the side having no concave portion at the portion without the concave portion, A plurality of slots formed in the positions of the recesses in the prisms, the first strip plane conductors and the second strip plane conductors inside the polygonal columns, and the slots It forms a parallel two wire to be fed.

  According to another aspect of the present invention, there is provided a method for manufacturing a linear array antenna, comprising: a plurality of first recesses provided on one long side of two long sides of a rectangular planar conductor; On the other side of the long side, a plurality of second recesses provided at positions facing the first recesses, a first strip planar conductor branched through a plurality of branches, and a plurality of A second strip plane conductor branched through a branch, and a tip end of the first strip plane conductor is connected to each of the plurality of first recesses one by one, and the second strip plane conductor The conductor flat plate having one end connected to each of the plurality of second recesses is bent along a plurality of preset folding lines parallel to the long side, and the first rectangular conductor flat plate is bent. The length of the concave side of And the long side on the side having the second recess are joined to each other at a portion without the first recess and the second recess, so that a polygonal column is formed in the polygonal column. A plurality of slots formed at the positions of the recesses and the second recesses, the first strip plane conductors and the second strip plane conductors inside the polygonal column, and the plurality of slots. And two parallel wires for supplying power to the power source.

  The linear array antenna according to the present invention includes a plurality of concave portions provided on one long side of two long sides of a rectangular planar conductor, and a first strip planar conductor branched via a plurality of branches. And a second strip plane conductor branching through a plurality of branches, and a tip of the first strip plane conductor is connected to each of the plurality of recesses one by one, and the second strip plane conductor A plurality of preset bends, each of which is formed of a conductor flat plate having one end connected to each of the long sides opposite to the first strip plane conductor and the connecting portion of the concave portion, parallel to the long sides. A polygonal column formed by bending along the line and joining the long side on the side with the concave portion and the long side on the side without the concave portion at the portion without the concave portion, and a space in the polygonal column Et A plurality of slots formed at the positions of the recesses, and a plurality of slots in the polygonal column, having the first strip plane conductor and the second strip plane conductor, and supplying power to the plurality of slots. With a line.

  Furthermore, a linear array antenna according to another invention includes a plurality of first concave portions provided on one long side of two long sides of the rectangular planar conductor, and the two long sides of the rectangular planar conductor. A plurality of second recesses provided at positions opposite to the first recesses, a first strip planar conductor branched through a plurality of branches, and a plurality of branches. A second strip plane conductor that is branched, and one end of each of the first strip plane conductors is connected to each of the plurality of first recesses, and the end of the second strip plane conductor is The conductive plate is connected to each of the plurality of second recesses one by one, bent along a plurality of preset fold lines parallel to the long side, and the length on the side having the first recess Side and side with second recess A polygonal column formed by joining the long side at a portion without the first recess and the second recess, and the first recess and the second recess formed in the polygonal column. A plurality of slots formed at positions, and parallel two wires that are inside the polygonal column and have the first strip plane conductor and the second strip plane conductor and feed the plurality of slots. It is provided.

  According to this invention, the conductor flat plate is bent along a plurality of preset folding lines parallel to the long side, and the long side on the concave side and the long side on the non-recessed side of the rectangular conductive flat plate are formed. A slot array antenna fed by two parallel wires can be manufactured by joining at a portion having no recess, and a horizontal polarization horizontal plane omnidirectional linear array antenna having a simple structure and a small antenna width can be easily manufactured. be able to.

Embodiment 1 FIG.
A linear array antenna and a manufacturing method thereof according to Embodiment 1 of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view showing a configuration of a linear array antenna according to Embodiment 1 of the present invention, and FIG. 2 is a diagram illustrating a method for manufacturing a linear array antenna according to Embodiment 1 of the present invention. FIG. 3 is a diagram in which the conductor flat plate shown in FIG. 2 is bent, FIG. 4 is a diagram in which the conductor flat plate shown in FIG. 3 is further bent, and FIG. 5 is joined to the conductor flat plate shown in FIG. FIG. 6 is a perspective view showing a configuration of a linear array antenna manufactured by bending the conductor flat plate shown in FIG. 5, and FIG. 7 is a linear view when the slot shape is a dogbone shape. It is a perspective view which shows the structure of an array antenna. In addition, in each figure, the same code | symbol shows the same or equivalent part.

  As shown in FIG. 1, the linear array antenna according to the first embodiment includes a rectangular columnar conductor 1 having a rectangular cross section (xy plane), a plurality of slots 2 formed in the rectangular columnar conductor 1, Parallel two wires 3 for supplying power to the slot 2 are provided. The square columnar conductor 1 is hollow. Each of the plurality of slots 2 operates as a slot antenna. Here, in the coordinate system shown in FIG. 1, the xy plane is a horizontal plane. In addition, a polarization whose electric field is parallel to the xy plane is a horizontal polarization.

  The length of the side a of the square columnar conductor 1 is smaller than the length of the side b. The lengths of the side a and the side b may be, for example, a = about 0.04 wavelength and b = about 0.2 wavelength. The slot 2 is installed on a surface having a length of one side of the square columnar conductor 1 of a. The length L of the slot 2 is generally half to one wavelength, and the width W of the slot 2 is sufficiently smaller than the wavelength. The parallel two lines 3 have a plurality of distributors (combiners), and a desired excitation amplitude and excitation phase are given to the plurality of slots 2. The parallel two wires 3 are constituted by two conductor plates, and the two conductor plates are respectively connected to the two length L sides of the slot 2.

  When the slot 2 is fed by the parallel two wires 3, an electric field is generated in parallel with the side of the width W. Since the back side (+ y direction) of the slot 2 is shielded by the conductor, radiation is generated only on the front side (−y direction) of the slot 2. At this time, radiation from the slot 2 can be regarded as radiation from a magnetic current parallel to the length L side of the slot 2. Accordingly, horizontal polarization is excited.

  In general, the half-power width of the beam from the antenna is proportional to (wavelength / antenna aperture diameter). In the linear array antenna according to the first embodiment, the case where the width W of the slot 2 is sufficiently smaller than the wavelength as described above is illustrated, and the width W of the slot 2 through which the magnetic current flows is sufficiently larger than the wavelength. When it is small, a radiation pattern in which the horizontal polarization is almost omnidirectional in the horizontal plane can be obtained.

  The linear array antenna according to the first embodiment can be manufactured by bending a conductor flat plate 5 as shown in FIG. In FIG. 2, the conductor flat plate 5 includes a plurality of recesses 12 provided on one long side of two long sides of a rectangular planar conductor, and a first strip plane conductor 3a branched through a plurality of branches. And a second strip plane conductor 3b branched through a plurality of branches, and the tips of the first strip plane conductors 3a are connected to the plurality of recesses 12 one by one, respectively. One end of each conductor 3b is connected to the long side opposite to the connecting portion between the first strip plane conductor 3a and the recess 12 one by one.

  The conductor flat plate 5 shows a plurality of preset folding lines 6, 7, 8 parallel to the long side, and the conductor flat plate 5 is bent along the folding lines 6, 7, 8 to form a rectangular conductor The rectangular columnar conductor 1 as a polygonal columnar conductor is formed by joining the long side of the flat plate 5 on the side having the concave portion 12 and the long side on the side having no concave portion 12 at the portion without the concave portion 12 (joining portion 4); A plurality of slots 2 formed in the positions of the recesses 12 formed in the quadrangular columnar conductor 1, and a first strip plane conductor 3a and a second strip plane conductor 3b inside the quadrangular columnar conductor 1, A linear array antenna having parallel two wires 3 feeding power to a plurality of slots 2 can be manufactured.

  That is, when the conductor flat plate 5 shown in FIG. 2 is bent at a right angle along the fold line 6, the result is as shown in FIG. Further, when the fold line 7 is bent at a right angle, the result is as shown in FIG. 4. Finally, when the fold line 8 is bent at a right angle, the linear array antenna shown in FIG. 1 can be obtained.

  The joining portion 4 shown in FIG. 1 is joined by welding, adhesive tape, or the like. Therefore, as shown in FIGS. 5 and 6, a joining margin 9 may be added to the conductor flat plate 5. The conductor flat plate 5 is manufactured by, for example, sheet metal punching or chemical etching. In addition, although the terminal part of the + z-axis direction of the square columnar conductor 1 may be left as it is, it is conceivable to close it with a flat conductor or an absorption band.

  Here, the configuration of the parallel two wires 3 is appropriately designed according to the input impedance of each slot antenna and the desired excitation amplitude / phase, and is not limited to the shape shown in FIG.

  The input impedance of the slot antenna can be adjusted by changing the feeding position of the parallel two wires 3, the length L of the slot 2, and the width W of the slot 2. In general, when the feeding position of the parallel wires 3 is moved from the midpoint of the length L side of the slot 2 to the end of the length L side, the real part of the input impedance becomes smaller. Further, as the length L of the slot 2 is increased, the real part of the input impedance is reduced. Further, when the width W of the slot 2 is increased, the real part of the input impedance is increased.

  Although the case where the slot 2 is rectangular has been described here, the shape of the slot 2 is not limited to a rectangle, and various shapes such as a dog horn shape and an elliptical shape as shown in FIG. 7 are conceivable.

If the length L of the slot 2 is increased, the real part of the input impedance can be reduced. However, when the beam is directed to a plane inclined by θ ₀ degrees from the horizontal plane, the element spacing (see FIG. 1, the distance between the midpoint of the side of the length L of the slot 2 and the midpoint of the side of the length L of the adjacent slot 2 is represented by {wavelength / (1+ | sinθ ₀ |)}. It needs to be small. Therefore, when the slot 2 is rectangular, its length L is limited to less than {wavelength / (1+ | sin θ ₀ |)}. Here, when the slot 2 has a dog horn shape, the length (L ₂ + L ₃ ) of the entire slot can be adjusted while the length L ₂ of the dog horn shape slot 2 shown in FIG. 7 is kept constant. . Therefore, there is an effect that the degree of freedom in adjusting the input impedance is increased.

  As described above, according to the first embodiment, the conductor flat plate 5 is bent along a plurality of preset folding lines 6, 7, 8 parallel to the long sides, and the side of the rectangular conductor flat plate on which the concave portion is provided. The slot array antenna fed by the parallel two wires 3 can be manufactured by joining the long side and the long side on the side without the concave portion at the portion without the concave portion, and the horizontal structure with a simple structure and a small antenna lateral width can be manufactured. There is an effect that a method for easily manufacturing a polarization horizontal plane omnidirectional linear array antenna can be obtained.

Embodiment 2. FIG.
FIG. 8 is a perspective view showing the configuration of the linear array antenna according to Embodiment 2 of the present invention. FIG. 9 is a developed view of a conductor flat plate for explaining a method for manufacturing a linear array antenna according to Embodiment 2 of the present invention. The second embodiment exemplifies a case where the position of the joint portion 4 of the rectangular columnar conductor 1 of the linear array antenna shown in the first embodiment is changed.

  The linear array antenna according to the second embodiment can be manufactured by bending a conductor flat plate 5 as shown in FIG. In FIG. 9, a conductor flat plate 5 has a plurality of recesses 12 provided on one of two long sides of a rectangular planar conductor (hereinafter, the recesses 12 are referred to as first recesses 12 in the second embodiment). And a plurality of second recesses 13 provided at positions opposite to the first recesses 12 on the other side of the two long sides of the rectangular planar conductor, and a second branching through a plurality of branches. One strip plane conductor 3a and a second strip plane conductor 3b branched through a plurality of branches. One end of the first strip plane conductor 3a is provided in each of the plurality of first recesses 12. The tips of the second strip plane conductors 3b are connected to the plurality of second recesses 13 one by one.

  The conductor flat plate 5 shows a plurality of preset folding lines 6, 7, 8 parallel to the long side, and the conductor flat plate 5 is bent along the folding lines 6, 7, 8 to form a rectangular conductor The long side of the flat plate 5 on the side having the first concave portion 12 and the long side on the side having the second concave portion 13 are joined at a portion where the first concave portion 12 and the second concave portion 13 are not present (joining portion 4). By doing so, the rectangular columnar conductor 1 as a polygonal columnar conductor, the plurality of slots 2 formed at the positions of the first concave portion 12 and the second concave portion 13 that are vacated in the rectangular columnar conductor 1, and the rectangular columnar conductor 1 It is possible to manufacture a linear array antenna that is inside and has a first strip plane conductor 3 a and a second strip plane conductor 3 b and formed with two parallel wires 3 that feed power to the plurality of slots 2.

  That is, the linear array antenna shown in FIG. 8 can be obtained by bending the conductor flat plate 5 shown in FIG. 9 at right angles along the folding lines 6, 7, and 8.

  As described above, according to the second embodiment, the conductor flat plate 5 is bent along a plurality of preset folding lines 6, 7, 8 parallel to the long sides, and the two long sides of the rectangular conductor flat plate are A slot array antenna fed by parallel two wires 3 can be manufactured by joining together at a portion without a recess, and a horizontal polarization horizontal plane omnidirectional linear array antenna with a simple structure and a small antenna lateral width can be simplified. This produces an effect that a method of manufacturing can be obtained.

Embodiment 3 FIG.
FIG. 10 is a perspective view showing a configuration of a linear array antenna according to Embodiment 3 of the present invention. The third embodiment exemplifies a case where a plurality of holes 10 that are sufficiently smaller than the wavelength are formed on the surface of the rectangular columnar conductor 1 of the linear array antenna shown in the first and second embodiments.

  When the parallel two wires 3 are installed in the quadrangular columnar conductor 1, a coaxial mode in which the two conductor plates constituting the parallel two wires 3 are the central conductor and the quadrangular columnar conductor 1 is the outer conductor may occur. Therefore, as shown in FIG. 10, when a plurality of holes 10 that are sufficiently smaller than the wavelength are formed on a surface other than the surface having the slot 2 of the rectangular columnar conductor 1, the rectangular columnar conductor 1 is equivalent at a certain frequency. To act as a magnetic wall. Therefore, the current flowing on the surface of the rectangular columnar conductor 1 is suppressed, and the coaxial mode can be suppressed.

  In addition, the shape of the plurality of holes 10 may be a circle, a square, a triangle, or the like.

  As described above, according to the third embodiment, the coaxial mode can be suppressed by bending the conductor flat plate 5 having a plurality of holes 10 sufficiently smaller than the wavelength on the surface, and power is fed by the parallel wires 3. The effect is that the slot array antenna to be manufactured can be manufactured.

Embodiment 4 FIG.
FIG. 11 is a perspective view showing the configuration of a linear array antenna according to Embodiment 4 of the present invention. The fourth embodiment exemplifies a case where a dielectric 11 is placed in the rectangular columnar conductor 1 of the linear array antenna shown in the first and second embodiments.

The plurality of slots 2 constitute a linear array antenna, and the element spacing (distance between the midpoint of the side of the length L of the slot 2 and the midpoint of the side of the length L of the adjacent slot 2) It is desirable that the dimension be such that no grating lobe is generated. For example, when the beam is directed to the horizontal plane, the element interval is made smaller than one wavelength. In addition, when the beam is swung from a horizontal plane to a plane inclined by θ ₀ degrees, the element spacing is made smaller than {wavelength / (1+ | sin θ ₀ |)}.

However, if the inside of the rectangular columnar conductor 1 is a cavity (air), when the beam is swung to a plane inclined by θ ₀ degrees from the horizontal plane, the length S of the parallel two wires 3 shown in FIG. 1+ | sin θ ₀ |)}, and it is necessary to feed power to each slot 2 with a phase difference. In this case, since the length S of the parallel two wires 3 and the element intervals of the plurality of slots 2 are the same length, a grating lobe is generated.

Therefore, when the dielectric 11 is filled in the rectangular columnar conductor 1, the wavelength of the wave propagating through the parallel two wires 3 is equivalently reduced. Therefore, the length S of the parallel two wires 3 can be made smaller than {wavelength / (1+ | sin θ ₀ |)}, and no grating lobe is generated.

  In FIG. 11, the dielectric 11 is filled in the rectangular columnar conductor 1, but the dielectric 11 may be installed only in a part of the rectangular columnar conductor 1. For example, it is also conceivable to install the dielectric 11 between two conductor plates constituting the parallel two wires 3. Of course, the fourth embodiment can be applied to the linear array antenna shown in the third embodiment.

  In the first to fourth embodiments described above, the case where the linear array antenna is configured by the rectangular columnar conductor 1 whose cross section (xy plane) is rectangular has been described. However, the cross section (xy plane) of the square columnar conductor 1 is a parallelogram. Other squares such as a trapezoid may be used. Further, instead of the quadrangular columnar conductor 1, a polygonal column conductor such as a triangular columnar conductor may be used.

It is a perspective view which shows the structure of the linear array antenna which concerns on Embodiment 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a development view of a conductor flat plate for explaining a method for manufacturing a linear array antenna according to a first embodiment of the present invention. It is the figure which bent the conductor flat plate shown in FIG. It is the figure which further bent the conductor flat plate shown in FIG. It is the figure which added the margin for joining to the conductor flat plate shown in FIG. It is a perspective view which shows the structure of the linear array antenna manufactured by bending the conductor flat plate shown in FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view illustrating a configuration of a linear array antenna in a case where a slot shape is a dogbone shape, for describing a method for manufacturing a linear array antenna according to a first embodiment of the present invention. It is a perspective view which shows the structure of the linear array antenna which concerns on Embodiment 2 of this invention. It is for developing the manufacturing method of the linear array antenna which concerns on Embodiment 2 of this invention, and is an expanded view of a conductor flat plate. It is a perspective view which shows the structure of the linear array antenna which concerns on Embodiment 3 of this invention. It is a perspective view which shows the structure of the linear array antenna which concerns on form 4 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Square columnar conductor, 2 slots, 3 parallel 2 wires, 3a 1st strip plane conductor, 3b 2nd strip plane conductor, 4 junction part, 5 conductor flat plate, 6-8 fold line, 9 bonding margin, 10 Hole, 11 dielectric, 12 recess (first recess), 13 second recess.

Claims (10)

A plurality of concave portions provided on one of the two long sides of the rectangular planar conductor, a first strip planar conductor branched through a plurality of branches, and a branching through a plurality of branches A second strip plane conductor, and a tip end of the first strip plane conductor is connected to each of the plurality of recesses, and a tip end of the second strip plane conductor is the first strip plane conductor. And bending the conductor flat plates connected one by one to the long side opposite to the connecting portion of the recess along a plurality of preset fold lines parallel to the long side,
By joining the long side of the rectangular conductor flat plate on the side having the concave portion and the long side on the side without the concave portion at a portion without the concave portion, a polygonal column is formed in the polygonal column, and the polygonal column is opened. A plurality of slots formed at the positions of the recesses, and parallel two wires inside the polygonal column, having the first strip plane conductor and the second strip plane conductor, and supplying power to the plurality of slots And a method of manufacturing a linear array antenna. A plurality of first recesses provided on one of the two long sides of the rectangular planar conductor, and the first recess on the other side of the two long sides of the rectangular plane conductor. A plurality of second recesses provided at positions opposite to each other, a first strip plane conductor branched through a plurality of branches, and a second strip plane conductor branched through a plurality of branches. Each of the first strip plane conductors is connected to each of the plurality of first recesses, and each of the second strip plane conductors is connected to the plurality of second recesses. Bending the connected conductor flat plate along a plurality of preset fold lines parallel to the long side,
The long side of the rectangular conductor plate on the side having the first concave portion and the long side on the side of the second concave portion are joined at a portion without the first concave portion and the second concave portion. A plurality of slots formed in positions of the first recess and the second recess formed in the polygonal column, and the first strip in the polygonal column. A method of manufacturing a linear array antenna having a planar conductor and the second strip planar conductor, and forming parallel two wires that feed power to the plurality of slots. The method for manufacturing a linear array antenna according to claim 1, wherein the polygonal column is a quadrangular column. The method for manufacturing a linear array antenna according to any one of claims 1 to 3, wherein a plurality of holes that are sufficiently smaller than a wavelength are formed in the polygonal column. The method for manufacturing a linear array antenna according to any one of claims 1 to 4, wherein a dielectric is placed inside the polygonal column. A plurality of concave portions provided on one of the two long sides of the rectangular planar conductor, a first strip planar conductor branched through a plurality of branches, and a branching through a plurality of branches A second strip plane conductor, and a tip end of the first strip plane conductor is connected to each of the plurality of recesses, and a tip end of the second strip plane conductor is the first strip plane conductor. And a conductive flat plate connected to each of the long sides opposite to the connecting portion of the concave portion, bent along a plurality of preset folding lines parallel to the long side, and the side having the concave portion A polygonal column formed by joining the long side and the long side on the side without the concave portion at a portion without the concave portion,
A plurality of slots formed in the positions of the recesses in the polygonal column;
A linear array antenna provided inside the polygonal column and having the first strip plane conductor and the second strip plane conductor, and parallel two wires for feeding power to the plurality of slots. A plurality of first recesses provided on one of the two long sides of the rectangular planar conductor, and the first recess on the other side of the two long sides of the rectangular plane conductor. A plurality of second recesses provided at positions opposite to each other, a first strip plane conductor branched through a plurality of branches, and a second strip plane conductor branched through a plurality of branches. Each of the first strip plane conductors is connected to each of the plurality of first recesses, and each of the second strip plane conductors is connected to the plurality of second recesses. It is a conductive flat plate connected, bent along a plurality of preset fold lines parallel to the long side, the long side on the side having the first recess and the side on the side having the second recess The long side, the first recess and the second recess A polygonal column which is formed by joining the free portion,
A plurality of slots formed in positions of the first recess and the second recess formed in the polygonal column;
A linear array antenna provided inside the polygonal column and having the first strip plane conductor and the second strip plane conductor, and parallel two wires for feeding power to the plurality of slots. The linear array antenna according to claim 6, wherein the polygonal column is a quadrangular column. The linear array antenna according to claim 6, wherein a plurality of holes sufficiently smaller than a wavelength are formed in the polygonal column. The method for manufacturing a linear array antenna according to claim 6, wherein a dielectric is placed inside the polygonal column.

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