JP2003152441A - Planar circular polarization waveguide slot and array antennas, and planar waveguide slot and array antennas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide planar circular polarization waveguide slot and array antennas that can stably radiate circular polarization waves by standing wave excitation. SOLUTION: An antenna 10 composes a planar waveguide array antenna by a plurality of waveguides 3 for radiation having a plurality of slot elements 5 and a waveguide 2 for feeding power that becomes a feeding means to the waveguides 3 for radiation. The slot element 5 is composed of a pair of slots 6 and 7 that are positioned in an L or inverse L shape and has different length's. One of the slots is along a tube axial on the wide wall surface of the waveguide 3 for radiation, and at the same time the L-shaped and inverse-L-shaped slot elements are alternately arranged along the tube axial of the waveguide 3 for radiation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar circular polarization waveguide slot antenna, a planar circular polarization waveguide array antenna, a planar waveguide slot antenna and a planar waveguide array antenna, and is particularly arbitrary. The present invention relates to those suitable for applications such as wireless communication and radar using circularly polarized waves or linearly polarized waves.

[0002]

2. Description of the Related Art A planar waveguide slot antenna is a wide wall surface of a rectangular waveguide for radiation (hereinafter, referred to as a flat waveguide slot antenna) having one end short-circuited or match-terminated.
It is called the H side. ) Are provided with a plurality of slot elements, and various proposals have been made regarding the shape and arrangement of the slots with respect to the properties of the polarized waves radiated from the slots.
The same applies to a planar waveguide array antenna configured by arranging a plurality of planar waveguide slot antennas in a direction orthogonal to the tube axis of the H plane.

Conventionally, for example, as in an antenna 20 shown in FIG. 1, by arranging the slots 21 and 22 of a pair at 45 ° and −45 ° with respect to the propagation direction and crossing them in an X-shape, they are combined. A technique for making these slot pairs 21 and 22 act as an element antenna that generates circularly polarized waves has been put into practical use. That is, it is known that various characteristics as an antenna can be exhibited depending on the formation state of the slot pair. In the figure, reference numeral 23 is a waveguide, 24 is a feeding opening, and 25 is a feeding waveguide guide portion.

However, the conventional planar waveguide slot antenna and planar waveguide array antenna techniques are insufficient in terms of radiation of stable circularly polarized waves or linearly polarized waves due to standing wave excitation. There is a need for improvement in this respect.

Therefore, for example, as an antenna 30 shown in FIG. 2, an antenna which has a phase difference of 90 degrees and is circularly polarized by changing the lengths of the slots 31 and 32 of the pair to be crossed has been proposed. There is. Antenna 2 shown in FIG.
0 uses the traveling wave to obtain a phase difference of 90 degrees,
The antenna 30 shown in FIG. 2 can be used for standing wave excitation because the difference in length between the slots 31 and 32 is used. In the antenna 30 of FIG. 2, the lower right part of the waveguide 33 in the figure is short-circuited, but when a traveling wave is used, it is terminated by using a matching load. In the figure, λg indicates the in-tube wavelength.

However, there is a problem that it is difficult to form the antenna 30 of FIG. 2 into multiple elements in order to obtain a high gain. That is, considering the antenna 30 of FIG. 2 as one element,
When multiple elements are used and a plurality of elements are used to emit radio waves of the same phase from each element, the antenna 30 of FIG.
Must be arranged at intervals of the in-tube wavelength λg, but since the in-tube wavelength λg of the waveguide 33 is longer than one wavelength λ in the free space, a grating lobe occurs.

[0007]

In order to solve the above-mentioned problems, a planar circular polarization waveguide slot antenna according to claim 1 of the present invention comprises a plurality of slot elements, and one end thereof is short-circuited and terminated. The slot element is composed of a radiation waveguide and a power feeding means to the radiation waveguide, and the slot element has a V-shape or an inverted C-shape with the tube axis sandwiched on the wide wall surface of the radiation waveguide. It is characterized in that it is composed of a pair of slots having different lengths, and the above-mentioned C-shaped slot elements and the above-mentioned inverted C-shaped slot elements are alternately arranged along the tube axis.

A plane circular polarization waveguide array antenna according to a second aspect of the present invention is to solve the above-mentioned problems.
It is composed of a plurality of radiation waveguides having a plurality of slot elements, one end of which is short-circuited and terminated, and a power feeding means to the radiation waveguides. A pair of slots having different lengths, which are arranged adjacent to each other in a direction orthogonal to the above, and in which the slot elements are positioned in a V shape or an inverted C shape with the tube axis sandwiched on the wide wall surface of the radiation waveguide. The slot elements having the V-shape and the slot elements having the inverted C-shape are alternately arranged along the pipe axis, and are also arranged alternately in a direction orthogonal to the pipe axis. It is characterized by

According to a third aspect of the present invention, there is provided a planar circular polarization waveguide slot antenna, wherein a plurality of planar circular polarization waveguide slot antennas are arranged in an even number array in order to solve the above problems. And a radiation waveguide whose both ends are short-circuited, and a power feeding means to the radiation waveguide,
The slot element is composed of a pair of slots having different lengths, which are positioned in a C shape or an inverted C shape across the tube axis of each row on the wide wall surface of the radiation waveguide. Slot elements and the inverted C-shaped slot elements are alternately arranged along the tube axis of each row, and a power feeding opening of the power feeding means is provided at a central position on the wide wall surface of the radiation waveguide. It is characterized by being arranged.

In order to solve the above-mentioned problems, a planar circular polarization waveguide array antenna according to a fourth aspect of the present invention is provided.
It is composed of an even number of radiation waveguides having a plurality of slot elements, both ends of which are short-circuited, and a feeding means for feeding the radiation waveguides. Adjacently arranged along the direction orthogonal to the axis, the slot element,
It consists of a pair of slots of different lengths located in a V shape or an inverted C shape across the tube axis on the wide wall of the radiation waveguide, and the slot element of the C shape and the inverted C shape. The slot elements and are alternately arranged along the tube axis,
Also, the power supply openings of the power supply means are arranged alternately along the direction orthogonal to the tube axis, and the power supply openings of the power supply means are arranged at the center positions on the surface formed by the wide wall surfaces of the plurality of radiation waveguides. Characterize.

In order to solve the above-mentioned problems, a planar waveguide slot antenna according to a fifth aspect of the present invention is provided with a plurality of slot elements arranged in an even numbered array, and the radiation is short-terminated at both ends. A waveguide for radiation and a power feeding means to the waveguide for radiation, wherein the slot element comprises a slot parallel to the tube axis of each row on the wide wall surface of the waveguide for radiation. The two slots adjacent to each other along the tube axis of each row are alternately located on opposite sides of the tube axis, and the two slots are adjacent to each other in the vicinity of the central position on the wide wall surface of the radiation waveguide. The slots are positioned close to each other, and the power feeding opening of the power feeding means is arranged at a central position between the adjacent slots.

In order to solve the above problems, a planar waveguide array antenna according to a sixth aspect of the present invention is provided with a plurality of slot elements, and an even number of radiation waveguides having both ends short-circuited and terminated. And a power supply means to the radiation waveguide,
The plurality of radiation waveguides are arranged adjacent to each other along a direction orthogonal to their tube axes, and the slot element comprises a slot parallel to the tube axis on a wide wall surface of the radiation waveguide, The slots adjacent to each other along the tube axis are alternately located on opposite sides of the tube axis, and the two slots adjacent to each other in the vicinity of the central position on the surface formed by the wide wall surfaces of the plurality of radiation waveguides are adjacent to each other. The slots are located close to each other, and a power supply opening of the power supply means is arranged at a central position between the slots located close to each other.

In order to solve the above-mentioned problems, a planar waveguide array antenna according to a seventh aspect of the present invention includes a plurality of slot elements, and a radiation waveguide whose one end is short-circuited and terminated. The slot element is composed of a pair of slots having different lengths located in an L-shape or an inverted L-shape, and one of the slots is a wide part of the radiation waveguide. A planar circular polarization waveguide slot characterized in that the L-shaped slot elements and the inverted L-shaped slot elements are alternately arranged on the wall surface along the tube axis and along the tube axis. antenna.

In order to solve the above-mentioned problems, a planar waveguide array antenna according to an eighth aspect of the present invention includes a plurality of waveguides for radiation which are provided with a plurality of slot elements and whose one end is short-circuited and terminated. A plurality of radiation waveguides are arranged adjacent to each other along a direction orthogonal to the tube axes, and the slot element is L-shaped or inverted L-shaped. A pair of slots having different lengths, one of the slots extending along the tube axis on the wide wall surface of the radiation waveguide, and the L-shaped slot element and the inverted L-shaped slot element.
The character-shaped slot elements are arranged alternately along the tube axis, and also arranged alternately along the direction orthogonal to the tube axis.

In order to solve the above problems, a planar waveguide array antenna according to a ninth aspect of the present invention is provided with a plurality of slot elements arranged in one or more rows, and both ends are short-circuited and terminated. A radiation waveguide and a feeding means for feeding the radiation waveguide, and the slot element is L-shaped or inverted L-shaped.
It consists of a pair of slots with different lengths that are located in a letter shape,
One of the slots is arranged along the tube axis on the wide wall surface of the radiation waveguide, and the L-shaped slot element and the inverted L-shaped slot element are alternately arranged along the tube axis. The power feeding opening of the power feeding means is arranged at a position other than a portion in the vicinity of the outer periphery of the surface of the radiation waveguide that faces the wide wall surface on which the slot element is formed.

In order to solve the above problems, a planar waveguide array antenna according to a tenth aspect of the present invention is provided with a plurality of slot elements and a plurality of radiating waveguides whose both ends are short-circuited and terminated. And a feeding means to the radiation waveguide, the radiation waveguides are arranged adjacent to each other along a direction orthogonal to the tube axes, and the slot element is L-shaped or inverted L-shaped. A pair of slots of different lengths located in an L shape, one of the slots along the tube axis on the wide wall of the radiating waveguide, and the L-shaped slot element and the inverted L-shaped slot element And alternately arranged along the tube axis, and also alternately arranged along the direction orthogonal to the tube axis, and the wide wall surface forming the slot element of the plurality of radiation waveguides and Above the outer surface of the opposing surface Characterized by comprising arranging the feeding opening of the feeding means.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. For convenience of description, the antenna according to the present invention will be described as a transmitting antenna, but it is clear that the antenna for receiving simply operates in reverse due to the reciprocity theorem, and therefore the description for receiving antenna will be omitted. Further, regarding the number of waveguides, the number of slot elements, and the like, those shown in the drawings are merely examples, and the present invention is not limited to those described or shown below.

FIG. 3 is a top view (A) conceptually showing one embodiment of a planar circular polarization waveguide slot antenna and a planar circular polarization waveguide array antenna using the same according to the present invention.
And (B) is a main part explanatory view, and the H surface of each waveguide is shown. In the figure, 1 is a feeding opening, 2 is a feeding waveguide, 3 ...
Are radiation waveguides, 4 ... The antenna 10 of the present embodiment is of a type referred to as a one-layer structure in which one power feeding waveguide 2 and a plurality of radiation waveguides 3 are arranged on the same plane. 2 is a radiation waveguide 3
Are arranged orthogonal to the tube axis direction. Various known means may be used for power feeding from the power feeding opening 1, and therefore description and illustration thereof are omitted. Further, one end of the radiation waveguide 3 is a short-circuit termination or a matching termination.

The feeding waveguide 2 is provided with four pairs of slot elements 5 in the illustrated example, and each radiation waveguide 3 is similarly provided with three pairs of slot elements 5. Each slot element 5 has a configuration in which a pair of slots 6 and 7 are arranged in a V shape with the tube axis of each waveguide sandwiched in the center, and is excited by a current of a component orthogonal to the axes of the slots 6 and 7. Each slot 6, 7
It radiates polarized waves in the direction of the electric field vector orthogonal to the axis of.

The slots 6 and 7 have different axial lengths in order to adjust the weight of radiation from each of them so that standing wave excitation can be performed (this is important for an array antenna). , Slot 6 is short and slot 7 is long. That is, the radiation wave from the short slot 6 has a fast phase, and the radiation wave from the long slot 7 has a slow phase.
Radiation is maximum when the magnetic field lines are parallel to the slot, and minimum when the magnetic field lines are perpendicular. Therefore, as shown in FIG. 3C, when the slots 6a and 7a having the same length are cut at the positions shown by the dotted lines, the amount of radiation becomes larger than when they are cut at the positions shown by the solid lines.

That is, the antenna 10 of the present embodiment is operated by a standing wave and the lengths of the slots 6 and 7 are changed to 9
The point that a circularly polarized wave is formed by giving a phase difference of 0 degree is the same as the antenna 30 shown in FIG. 2, but the slots 6 and 7 forming the antenna element are not crossed but are suitable for an array antenna. It is characterized in that it is formed in a V shape and that adjacent antenna elements have different shapes depending on the directions of the C shapes formed by the slots 6 and 7.

It should be noted that a pair of C-shaped slot pairs can also operate with a standing wave, and four pairs of C-shaped slots 6 and 7 may be arranged as shown in FIG.

FIG. 5 is a diagram showing changes in the amplitude and phase of the radiated electric field due to changes in the slot length. The solid line in the figure shows the amplitude,
The dotted line shows the phase. In standing wave excitation, the currents are all in phase, so if the ratio of the slot length to the free space wavelength is chosen such that the power delivered has the same amplitude and the phases are 90 degrees out of phase, circular polarization is produced. .

For example, for the ratio L1 of the length of the slot 6 to the free space wavelength, a point a of L1 = 0.43, which is 3 dB smaller than the peak of the amplitude waveform shown by the solid line, is taken, and the corresponding point on the phase waveform (point The phase of the point b) where the perpendicular drawn from a to the horizontal axis intersects the phase waveform is + 45 °, and then
Point c where a line drawn horizontally from the point a on the horizontal axis intersects the amplitude waveform
The length of the other slot 7 is selected so that the phase of the point on the phase waveform corresponding to (the point d where the perpendicular drawn from the point c to the horizontal axis intersects the phase waveform) is -45 ° (the example shown in the figure). Then, the ratio L2 between the length of the slot 7 and the free space wavelength is 0.52.). By doing so, circularly polarized waves can be generated, and the same as the patch antenna can be obtained. In the illustrated example, a right-handed circularly polarized wave is emitted.
Of course, in order to radiate the left-handed circularly polarized wave, the front and back sides of the drawing may be reversed.

FIG. 6 is a top view conceptually showing the second embodiment of the planar circular polarization waveguide slot antenna according to the present invention, in which the H surface of the waveguide is shown. In the following embodiments, the same parts as those in the previous embodiment will be described with the same reference numerals.

In this embodiment, a pair of waveguides having a structure similar to that of the radiation waveguide 3 of the previous embodiment is obtained by partitioning the inside of the radiation waveguide 50 whose both ends are short-circuited with a partition wall 51. The parts 52, 52 are formed, and each waveguide part 52 is provided with three pairs of slot elements 5. Further, the central portion of the partition wall 51 is cut, and the bottom surface portion facing the H surface on which the slot element 5 is formed is cut out to supply the power supply opening 53 to the waveguide portion 52.
Has been formed. The configurations of the slots 6 and 7 of the slot element 5 are the same as those in the previous embodiment, and thus the description thereof is omitted. Seeing this planar circular polarization waveguide slot antenna as one antenna element, for example, by arranging them in a matrix and feeding them to each other, a planar circular polarization waveguide array antenna can be constructed. As described above, the weight adjustment of the radiation from each important antenna element in the array antenna can be easily performed. In the present embodiment, the power supply opening 53 is provided at the center position of the bottom surface portion facing the H surface, but the present invention is not limited to this, and is provided at a portion corresponding to the outer circumference of the H surface or its vicinity. If not. Further, the numbers of the slot elements 5 and the waveguide portions 52 are not limited to the examples shown in the figures, and the slot elements 5 may be two or more in number and the waveguide portions 52 may be one or more in number.

FIG. 7 is a top view conceptually showing a modification of the embodiment shown in FIG. In this example, the overall length of each waveguide portion 52 is shortened so that the planar shape is a square. In addition, the position of the feeding opening 53, the slot element 5 and the waveguide portion 52 are also included. The configuration and operation are the same as those of the previous embodiment.

FIG. 8 is a top view conceptually showing another modification of the embodiment shown in FIG. In this example, each waveguide section 5
Each pair of slots 6 and 7 in 2 is divided by a partition wall 54, and a power feeding window 55 is formed at the center of the partition wall 54. The position and other configurations and operations of the power supply opening 53 are the same.

FIG. 9 is a top view conceptually showing the third embodiment of the planar circular polarization waveguide slot antenna according to the present invention, and the H surface of the waveguide is shown. In the present embodiment, the inside of the radiation waveguide 60 whose both ends are short-circuited is divided by partition walls 51 ... And the radiation waveguide 3 of the previous embodiment.
.. having the same structure as the above, and three pairs of slot elements 5 are arranged in each of the waveguide sections 52. Further, the central portion of the central partition wall 51 is cut to form a power supply opening 53 to the waveguide portion 52.
Further, each slot element 5 in each waveguide portion 52 is divided by a partition wall 54, and a power feeding window 55 is formed at the center of the partition wall 54. However, in order to make the propagation of the magnetic field smooth, the partition wall 51 is not provided at the portion corresponding to the power supply opening 53 in the direction orthogonal to the tube axis, but a partition wall with an opening may be provided like the other portions. .

Similar to the embodiment of FIG. 6, the planar circular polarization waveguide slot antenna is regarded as one antenna element, and the antenna elements are arranged in a matrix, for example, and are fed to each to form a planar shape. A circular polarization waveguide array antenna can be constructed, and the weight of radiation from each antenna element can be easily adjusted. In this example as well, other than that, the configuration and operation are the same as those of the previous embodiment, including the position of the power feeding opening 53, the slot element 5, and the waveguide section 52.

FIG. 10 is a top view conceptually showing the fourth embodiment of the planar waveguide slot antenna according to the present invention, in which the H surface of the waveguide is shown. This embodiment is shown in FIG.
Similar to the modified example, the overall length of the waveguide is shortened so that the planar shape is a square, and the structure other than the slot element is the same as the example of FIG. It is composed of one slot 70 formed linearly along the tube axis direction of the portion 52. Regarding the intervals between the slots 70 adjacent to each other in the direction orthogonal to the tube axis direction, those at positions sandwiching the power feeding opening 53 are provided closer to the partition wall 51 of the waveguide section 52 to narrow the intervals, and the other slots are provided at the waveguide section 52. It is provided on the outer wall side of the and has a wide interval. Although illustration is omitted, it is needless to say that an antenna having a rectangular H-plane shape as in the embodiment of FIG. 6 can be configured in the same manner as in the present embodiment while using a linear slot along the tube axis direction. . In this example as well, the power supply opening 53 is provided at the center position of the bottom surface portion facing the H surface, but the present invention is not limited to this, and it must be provided at a portion corresponding to the outer circumference as the H surface or its vicinity. Good. Also, the number of slot elements and waveguide portions 52 is not limited to the example shown in the figure, and it is sufficient that the number of slot elements is two or more and the number of waveguide portions 52 is one or more.

FIG. 11 is a diagram showing a modification of the embodiment shown in FIG. In this example, the slot 70 is connected to the waveguide section 52.
It is provided along the direction orthogonal to the tube axis direction. In this example as well, other than that, the configuration and operation are the same as those of the previous embodiment, including the position of the power feeding opening 53, the slot element 5, and the waveguide section 52.

FIG. 12 is a top view conceptually showing the fifth embodiment of the planar circular polarization waveguide slot antenna according to the present invention, in which the H surface of the waveguide is shown. This embodiment has a basic configuration similar to that of the embodiment shown in FIG. 9, but the slots 6 and 7 of the slot element 5 arranged in each waveguide part 52.
Are arranged in an L-shape or an inverted L-shape. That is, this configuration has an advantage that the slot 6 (or the slot 7) is parallel to the wall and radiates radio waves more easily than the above-described embodiments. There is also an advantage that the arrangement of the slots 6 and 7 is very simple.

Also in the planar circular polarization waveguide slot antenna of this embodiment, similar to the embodiment of FIG. 6, it is regarded as one antenna element, and these are arranged side by side, for example, in a matrix form, and are fed to each. For example, a planar circular polarization waveguide array antenna can be constructed, and the weight of radiation from each antenna element can be easily adjusted.

[0035]

As described above, the plane circular polarization waveguide slot antenna and the plane circular polarization waveguide array antenna according to the present invention can emit stable circular polarization by standing wave excitation. It will be possible.

[Brief description of drawings]

FIG. 1 is a perspective view showing a conventional planar circular polarization waveguide slot antenna.

FIG. 2 is a perspective view showing another conventional circular polarization waveguide slot antenna.

FIG. 3 is a top view (A) conceptually showing an embodiment of a planar circular polarization waveguide slot antenna according to the present invention and a planar circular polarization waveguide array antenna using the same, and an explanatory view of main parts. FIG. 6B is an explanatory view of the weight of radiation and FIG.

FIG. 4 is a top view conceptually showing another embodiment of the planar circular polarization waveguide slot antenna according to the present invention.

FIG. 5 is a diagram showing changes in amplitude and phase of a radiated electric field due to changes in slot length.

FIG. 6 is a top view conceptually showing a second embodiment of a planar circular polarization waveguide slot antenna according to the present invention.

FIG. 7 is a top view conceptually showing a modified example of the embodiment shown in FIG.

FIG. 8 is a top view conceptually showing another modification of the embodiment shown in FIG.

FIG. 9 is a top view conceptually showing a third embodiment of a planar circular polarization waveguide slot antenna according to the present invention.

FIG. 10 is a top view conceptually showing a fourth embodiment of the planar waveguide slot antenna according to the present invention.

11 is a top view conceptually showing a modified example of the embodiment shown in FIG.

FIG. 12 is a top view conceptually showing a fifth embodiment of the planar waveguide slot antenna according to the present invention.

[Explanation of symbols]

1,53 feeding opening 2 Waveguide for power feeding 3,50,60 Radiation waveguide 4,55 power supply window 5 slot elements 6, 7, 70 slots 10 antennas 51, 54 partition walls 52 Waveguide section

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5J021 AA01 AA09 AB05 CA02 FA32                       GA05 HA04 JA06                 5J045 AA13 AA26 BA02 CA04 DA04                       FA02 FA07 GA01 HA01 JA03                       JA15 NA07                 5J070 AD03 AD08 AD16 AK08 AK22

Claims (10)

[Claims] 1. A radiation waveguide comprising a plurality of slot elements, one end of which is short-circuit terminated, and a feeding means for feeding the radiation waveguide, wherein the slot element comprises the radiation waveguide. It consists of a pair of slots of different lengths that are located in a V shape or an inverted C shape across the tube wall on the wide wall surface of the pipe.The slot element of the C shape and the slot element of the inverted C shape are connected to each other. A planar circular polarization waveguide slot antenna characterized by being arranged alternately along the tube axis. 2. A plurality of radiating waveguides comprising a plurality of radiating waveguides having a plurality of slot elements, one end of which is short-circuited and terminated, and a feeding means for feeding the radiating waveguides. Are arranged adjacent to each other along a direction orthogonal to their tube axes, and the slot element has a pair of C-shaped or inverted C-shaped positions on both sides of the tube axis on the wide wall surface of the radiation waveguide. The slot elements having different lengths are arranged alternately along the tube axis, and the inverted C-shaped slot elements are arranged alternately along the direction orthogonal to the tube axis. A planar circular polarization waveguide array antenna, which is characterized in that it is arranged in 3. A radiation waveguide having a plurality of slot elements arranged in a row of at least one row and having both ends short-circuited and terminated.
The slot element is arranged in a V-shape or an inverted C-shape on both sides of the tube axis of each row on a wide wall surface of the radiation waveguide. A pair of slots having different lengths, the C-shaped slot elements and the inverted C-shaped slot elements are alternately arranged along the tube axis of each row, and the radiation waveguide A planar circular polarization waveguide slot antenna, wherein a feeding opening of the feeding means is arranged at a position other than a portion near an outer periphery of a surface facing the wide wall surface on which the slot element is formed. 4. A plurality of radiating waveguides comprising a plurality of radiating waveguides having a plurality of slot elements, both ends of which are short-circuited and terminated, and a feeding means for feeding the radiating waveguides. A pair of tubes are arranged adjacent to each other along a direction orthogonal to their tube axes, and the slot elements are arranged in a V-shape or an inverted C-shape on the wide wall surface of the radiating waveguide with the tube axis therebetween. Of slots having different lengths, the C-shaped slot elements and the inverted C-shaped slot elements are alternately arranged along the tube axis, and also along a direction orthogonal to the tube axis. The power supply openings of the power supply means are arranged alternately, and the power supply openings of the power supply means are arranged at positions other than the vicinity of the outer periphery of the surface of the plurality of radiation waveguides facing the wide wall surface on which the slot elements are formed. Planar circular polarization waveguide array antenna. 5. A radiation waveguide having a plurality of slot elements arranged in a row of one or more rows and having both ends short-circuited and terminated.
The slot element comprises a slot parallel to or orthogonal to the tube axis of each row on the wide wall surface of the radiation waveguide, and the radiation conductor is provided to the radiation waveguide. A planar waveguide slot antenna, characterized in that a feeding opening of the feeding means is arranged at a position other than a portion near the outer periphery of the surface of the wave tube facing the wide wall surface on which the slot element is formed. 6. An even number of radiation waveguides having a plurality of slot elements, both ends of which are short-circuited and terminated, and a feeding means for feeding the radiation waveguides, wherein the plurality of radiation waveguides are provided. The tubes are arranged adjacent to each other along a direction orthogonal to their tube axes, and the slot element is composed of slots parallel or orthogonal to the tube axis on the wide wall surface of the radiating waveguide. 2. A planar waveguide array antenna, characterized in that a feed opening of the feed means is arranged at a position other than a portion near an outer periphery of a surface of the waveguide facing the wide wall surface on which the slot element is formed. 7. A radiation waveguide comprising a plurality of slot elements, one end of which is short-circuit terminated, and a power feeding means for feeding the radiation waveguide, wherein the slot element is L-shaped or inverted L-shaped. It is composed of a pair of slots of different lengths, one of the slots extending along the tube axis on the wide wall of the radiation waveguide, and the L-shaped slot element and the inverted L-shaped slot element.
A planar circular polarization waveguide slot antenna, characterized in that character-shaped slot elements are arranged alternately along the tube axis. 8. A plurality of radiation waveguides comprising a plurality of radiation waveguides having a plurality of slot elements, one end of which is short-circuited and terminated, and a means for feeding the radiation waveguides. Are arranged adjacent to each other along a direction orthogonal to their tube axes, and the slot element comprises a pair of slots having different lengths located in an L-shape or an inverted L-shape, and one of the slots is provided with the waveguide for radiation. On the wide wall surface of the pipe, along the pipe axis, the L-shaped slot elements and the inverted L-shaped slot elements are alternately arranged along the pipe axis, and along the direction orthogonal to the pipe axis. A planar circular polarization waveguide array antenna characterized in that the two are also arranged alternately. 9. A radiation waveguide having a plurality of slot elements arranged in a row of one row or more and having both ends short-circuited and terminated.
The slot element is composed of a pair of slots having different lengths located in an L-shape or an inverted L-shape, and one of the slots of the radiation waveguide is provided. On the wide wall surface, along the tube axis, the L-shaped slot elements and the inverted L-shaped slot elements are alternately arranged along the tube axis, and the slot elements of the radiation waveguide are formed. A planar circular polarization waveguide slot antenna, characterized in that the feeding opening of the feeding means is arranged at a position other than a portion near the outer periphery of the surface facing the wide wall surface. 10. A plurality of radiating waveguides comprising a plurality of radiating waveguides having a plurality of slot elements, both ends of which are short-circuited and terminated, and a feeding means to the radiating waveguides. The tubes are arranged adjacent to each other along a direction orthogonal to their tube axes, and the slot element is composed of a pair of slots of different lengths located in an L-shape or an inverted L-shape, one of the slots being for the radiation guide. On the wide wall of the wave tube along the tube axis and above L
The slot elements having a V-shape and the slot elements having an inverted L shape are alternately arranged along the tube axis, and are also alternately arranged along a direction orthogonal to the tube axis, and the plurality of waveguides for radiation are radiated. A planar circular polarization waveguide array antenna, wherein a feed opening of the feed means is arranged at a position other than a portion near an outer periphery of a surface of the tube facing the wide wall surface on which the slot element is formed.