JP2661523B2 - Microstrip antenna - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microstrip antenna for circularly polarized waves.

[0002]

2. Description of the Related Art Conventionally, a microstrip antenna of this type has been disclosed in a published patent application (Title of the Invention: Microstrip Antenna, Published Patent Application: Hei 3-145305, Published: June 20, 1991). It is disclosed in). The disclosed microstrip antenna is powered from a microstrip line or slot line. FIG. 20 is a configuration diagram of a microstrip antenna manufactured by the present inventor in accordance with the contents of the specification of this publication. Here, (a) is a front view, (b) is Z1- of (a).
The Z2 cross-sectional view and the ( c ) view are detailed exploded perspective views.

[0003] The microstrip antenna of FIG.
Feed line 57 and the scan Bae - supplying linearly polarized wave of high-frequency electromagnetic field to a feed Patsuchi 53 of the circular conductive plate from the slot line including a slot plate 55 constituting the support 56 and slot 55a. The power supply patch 53 includes a pair of concave portions (partially missing portions of the circular conductive plate) 53a and 53b and a pair of convex portions (area increasing portions of the circular conductive plate) 53d provided on the circumference of the conductive plate.
By the effect of 53d, a right circularly polarized electromagnetic field is generated from the supplied high frequency electromagnetic field. That is, from the direction 58 of the radiated electric field of the linearly polarized high-frequency electromagnetic field, the clockwise direction 4 in FIG.
Concave portions 53a and 53b are provided at 5 ° positions (hereinafter, a line connecting the concave portions 53a and 53b is referred to as a feed patch symmetric axis 59), and a counterclockwise direction of 45 ° from a radiated electric field direction 58.
(That is, perpendicular to the feed patch symmetry axis 59)
When the projections 53d, 53d are provided on the
Radiates a circularly polarized electromagnetic field in the direction of one surface of the opposing circular parasitic patch 51. The passive patch 51 receives the above-mentioned circularly polarized electromagnetic field on one surface and re-radiates the circularly polarized electromagnetic field from the other surface. In this micro-strip antenna, like the feeding patch 53, the concave portion 53
The concave portions 51a, 51b are provided at substantially corresponding positions of the convex portions 53d, 53b.
51d, elliptical polarization (Axial Ratio)
To widen the bandwidth.

[0004] The microstrip antenna shown in FIG.
The non-feeding patch 51, the feeding patch 53, the slot 55a, and the feeding line 57 are formed on PET films 511, 531, 55, and 571 made of a thin polyester copper-clad laminate, respectively. Between the PET films 531 and 55, and between the PET films 55 and 571,
Spacers 52, 54 and 56 made of a foamed polyethylene sheet having a relative dielectric constant of about 1.1 are arranged.
Further, in this microstrip antenna, the PET film 511 (therefore, the parasitic patch 51) is covered with a radome 61 made of a dielectric material, and the PET film 571 is covered with a ground plate 63 with a spacer 62 similar to that described above. Protects the functional elements of the antenna.

The microstrip antenna of FIG. 20 manufactured for measuring the elliptical polarization rate and the return loss has a feeding patch 53 having a circular radius of 37.5 mm and a concave portion 53.
The maximum cutting depth of each of a and 53b is 5.8 mm from the circumferential line, the cutting width is 19.2 mm, and the minimum projecting height of each of the projections 51a and 51b is 5.8 m from the circumferential line.
m, the protrusion width is 19.2 mm. In addition, the radius of the non-feeding patch 51 is 34.5 mm, and the concave portions 51a and 51b are formed.
The maximum depth of cut is 6.8 mm from the circumference and the width of cut is 13.7 mm. In this antenna, the radius of the non-feeding patch 53 is made slightly smaller than that of the feeding patch 51 in order to improve the elliptical polarization rate and the return loss. The thickness of the spacers 52 and 54 is 10 mm and 3 mm, respectively.

FIG. 21 is a diagram showing the measurement results of the elliptical polarization rate and the return loss of the microstrip antenna of FIG.

In this microstrip antenna, the frequency showing the best elliptical polarization rate is about 1.68 GHz and the frequency showing the best return loss is about 1.57 GHz, and there is a difference of about 7% between the two. Assuming that the characteristics required for practical use of the circularly polarized microstrip antenna are an elliptical polarization rate of 4 dB or less and a return loss of 12 dB (mismatch loss of 0.3 dB) or less, this antenna has an elliptical polarization rate and return loss. Although the frequency bands satisfying the required characteristics are each about 80 MHz, the frequencies showing the best characteristics of the two are shifted from each other, so that there is no band satisfying both the required characteristics of the antenna. The deviation of the frequency characteristics between the elliptical polarization rate and the return loss is a characteristic generally found in this type of patch antenna.

In this type of microstrip antenna, it is considered that the difference in the feeding method to the antenna does not represent a significant difference in the frequency characteristics of the elliptical polarization rate and the return loss.

[0009]

As described above, in the conventional microstrip antenna, the frequency showing the best elliptical polarization rate and the frequency showing the best return loss (VSWR) are different from each other. There has been a problem that a frequency band that satisfies both the loss and radiation characteristics cannot be widened, and the usable antenna band is substantially narrow.

[0010]

According to the present invention, there is provided a microstrip antenna for circular polarization, which receives a high-frequency power and radiates a circularly polarized electromagnetic field from one surface of a circular conductor plate. A power supply means for supplying the high-frequency power to the power supply patch; and a parasitic power supply patch which receives the circularly polarized electromagnetic field from the power supply patch on one surface and re-radiates the circularly polarized electromagnetic field from the other surface. In the microwave microstrip antenna, the feeding patch is clockwise on a circumference of the circular conductive plate with respect to a direction of a straight line connecting a feeding end of the high-frequency power and a center of the circular conductive plate. Or a pair of recesses formed at approximately 45 ° in any of the counterclockwise directions, or a pair of convex portions as described above, or a pair of recesses formed in approximately 45 ° positions in the clockwise and counterclockwise directions, respectively. One of a pair of convex portions, wherein the parasitic patch is a rectangular conductor plate provided to face one surface of the circular conductor plate, and the rectangular conductor plates are It has either a pair of concave portions formed on a pair of opposing vertices, a pair of convex portions same as above, or a pair of concave portions and a pair of convex portions respectively formed on two pairs of opposing vertices. , The rectangular conductive plate body,
Non-powered pad connecting a pair of concave or convex parts of a rectangular conductive plate
A pair of a symmetric axis and the concave or convex portion of the power supply patch.
The angle between the feed patch symmetry axis connecting the
Best return loss and elliptical polarization of trip antenna
Rotate and take a predetermined angle so that the frequency bands match.
It is attached.

In this microstrip antenna, when the circularly polarized electromagnetic field radiated by the feeding patch is a right circularly polarized electromagnetic field, a parasitic patch symmetrical connecting a pair of the convex portions or the concave portions of the rectangular conductor plate. The axis is rotated counterclockwise with respect to a feeding patch symmetric axis connecting a pair of concave or convex portions of the feeding patch, and the circularly polarized electromagnetic field emitted by the feeding patch is a left circularly polarized electromagnetic field. In some cases, the passive patch symmetric axis connecting the pair of the convex portions or the concave portions of the rectangular conductor plate is rotated clockwise with reference to the power supply patch symmetric axis connecting the pair of the concave portions or the convex portions of the power supply patch. I have.

In one aspect of the power supply patch and the non-power supply patch in the microstrip antenna, the power supply patch includes a power supply end of the high-frequency power and a power supply end of the circular conductor plate on a circumference of the circular conductor plate. A pair of recesses formed at approximately 45 ° clockwise or counterclockwise with respect to the direction of a straight line connecting the center, and a feed patch symmetry line that connects the pair of recesses and that is perpendicular to the antenna center Having a pair of convex portions formed on a line, the parasitic patch is a rectangular conductive plate provided to face one surface of the circular conductive plate, and the rectangular conductive plate is One pair of recesses formed on a pair of vertices facing each other corresponding to a pair of recesses of the power supply patch, and another pair of vertices formed on a pair of vertices facing each other corresponding to a pair of protrusions of the power supply patch. And a convex portion.

[0013]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a first embodiment of the present invention. FIG. 1A is a front view, and FIG.
2 is a cross-sectional view, and ( c ) is an exploded perspective view.

This microstrip antenna is formed by a microstrip conductor comprising a microstrip conductor 3b, a spacer 4 and a ground plate 5 included in the power supply patch 3, and a circular conductor included in the power supply patch 3. A linearly polarized high-frequency electromagnetic field is supplied to the radiation conductor 3a of the plate. The feed patch 3 generates a right-handed circularly polarized electromagnetic field from the supplied high-frequency electromagnetic field due to the effect of the pair of recesses 3d, 3d provided on the conductor circumference of the radiation conductor 3a. That is, the concave portion 53 of FIG. 20 is placed at a position 45 ° clockwise (angle α) from the direction 6 of the radiated electric field of the linearly polarized high-frequency electromagnetic field.
The recesses 3d, 3d similar to those a and 53b are provided (hereinafter, a line connecting the recesses 3d and 3d with the antenna center 9 which is the center of the feeding patch 3 and the parasitic patch 1 is referred to as a feeding patch symmetric axis 7). The feeder patch 3 radiates a circularly polarized electromagnetic field in one surface direction of the parasitic feeder 1 made of an opposing square conductor plate via the dielectric spacer 2 made of the foamed polyethylene sheet or the like. I do. The passive patch 1 which is a constituent element of the present invention receives the circularly polarized electromagnetic field on one surface and re-radiates the circularly polarized electromagnetic field from the other surface.

In this microstrip antenna, concave portions 1a and 1b in which a portion of the apexes of the rectangular conductors of the rectangular conductor of the parasitic patch 1 are opposed to each other are provided, so that the elliptical polarization rate can be broadened, and The best frequency of the return loss and the best frequency of the elliptic polarization are matched. The recesses 1a, 1b are provided with the recesses 3c, 3 of the power supply patch.
The positions of the recesses 1a and 1b are on a parasitic patch symmetry axis 8 rotated counterclockwise from the feed patch symmetry axis 7 by an angle β. This feed patch symmetry axis 7
The angle β between the power supply patch and the axis of symmetry 8 depends on the dimensional parameters of the spacer 2, the recesses 1a and 1b, and the like. As an example, it is necessary to increase the angle β as the thickness of the spacer 2 increases. Conversely, if the thickness of the spacer 2 is close to zero, the angle β may be almost zero.

FIG. 1 shows a microstrip antenna for right-hand circular polarization. In order to use left-hand circular polarization, as is well known, the feeding patch symmetric axis 7 is opposite to the radiated electric field direction 6 in FIG. The recesses 3c and 3d are formed so as to be on the sides. Therefore, the recesses 1a and 1b of the parasitic patch 1 are also formed on the same side as the recesses 3c and 3d. At this time, the non-feeding patch symmetric axis 8 is rotated clockwise from the feeding patch symmetric axis 7.

Further, the components of the microstrip antenna may be composed of different parts, respectively.
( C ) As shown in the figure, the passive patch 1 and the spacer 2
And an integral dielectric substrate, and a power supply patch 3 and a spacer 4
The ground and the ground 5 may be constituted by separate integrated substrates.

FIG. 2 is a block diagram of a second embodiment of the present invention. FIG. 2A is a front view, and FIG.
FIG. FIG. 3 is an exploded perspective view showing this embodiment in further detail.

Referring to FIG. 2 and FIG. 3, this microstripton antenna, except for the parasitic patch 21,
It almost corresponds to the microstrip antenna of FIG.

That is, the spacers 22, 24, and 26, the slot plate 25, the feed line 27, the radome 31, the spacer 32, and the ground plate 33, which are the components of the antenna of this embodiment, are connected to the spacers 52, 54, and 56, respectively. It is the same as the plate 55, the feed line 27, the radome 31, the spacer 32, and the ground plate 33, and the radiated electric field direction 28 and the feed patch symmetric axis 29 also have the same meaning as the radiated electric field direction 58 and the feed patch symmetric axis 59.
Here, the dimensions of the power supply patch 23 are such that the circular radius of the conductor plate is substantially the same as that of the power supply patch 53,
The maximum cutting depth of each of a and 23b is 8.8 mm from the circumferential line, the cutting width is 17.6 mm, and the minimum protruding height of each of the projections 21a and 21b is 8.8 m from the production line.
m, the protrusion width is changed to 17.6 mm. However, the operation of generating the circularly polarized electromagnetic field by the feeding patch 23 is described in FIG.
0 of the microstrip antenna according to the prior art.

The parasitic patch 21 is a rectangular conductor plate that receives a circularly polarized electromagnetic field from one surface of the power supply patch 23, and corresponds to the concave portions 23 a and 23 b of the power supply patch 23. Recesses 21a and 21b are formed on a pair of opposing vertices (a line connecting the recesses 21a and 21b and the antenna center 31 is referred to as a parasitic symmetric axis 30 of the parasitic patch). The parasitic patch 21 has another pair of vertexes (a conductor area increasing portion at the apex portion) 21c at the apexes of the rectangular conductor plate on the axis orthogonal to the parasitic patch symmetry axis 30.
And 21d.

In the microstrip antennas of FIGS. 2 and 3 as well, the positions of the recesses 21a and 21b are on the parasitic patch symmetric axis 30 rotated by an angle 7 counterclockwise from the feed patch corresponding axis 29. The angle γ formed between the feeding patch symmetric axis 29 and the non-feeding patch symmetric axis 30 also varies depending on the dimensional parameters of the spacer 22, the recesses 21a and 21b, and the like. FIG. 1 shows how the angle γ changes and the direction of rotation of the parasitic symmetry axis 30 due to the direction of the circularly polarized electromagnetic field.
This is the same as the embodiment.

Further, the components of the microstrip antenna may be composed of different parts as shown in FIG.
Needless to say, the power supply patch 23 and the spacer 24, and the slot plate 25, the spacer 26, and the ground 5 may be formed as separate integrated substrates.

FIG. 4 is a diagram showing the measurement results of the elliptical polarization rate and the return loss of the second embodiment shown in FIGS. 2 and 3. In the microstrip antenna used for this measurement, the parasitic patch 23 has a rectangular conductor plate with one side of 61 mm and the concave portions 21a and 21b.
Is connected to two points 14 mm apart from the apex of the rectangular conductor to cut the conductor plate, and the protrusions 21c and 21d are formed by expanding the conductor plate by 16.2 mm in width from the apex. In addition, the rotation angle γ of the non-feeding patch symmetric axis 30 with respect to the feeding patch symmetric axis 29 is set to 30 °.

This measurement microstrip antenna
The frequency showing the best elliptical polarization is approximately 1.59 GHz,
The center of the frequency exhibiting a good return loss is also substantially the same, and both frequencies are substantially the same. A frequency band with an elliptical polarization ratio of 4 dB or less has a frequency of about 90 MHz, and a frequency band with a return loss of −12 dB or less has a wider 180 MHz. Therefore, the frequency band that satisfies the required characteristics of this antenna is almost determined by the frequency band that satisfies the elliptical polarization ratio of 4 dB or less, and there is no limitation on the use band due to the restriction of the return loss unlike the conventional microstrip antenna. .

FIG. 5 shows a third embodiment of the present invention.
(A) is a front view, (b) is a cross-sectional view along X1-X2, and ( c ) is an exploded perspective view. The configuration of this microstrip antenna is the same as that of the first embodiment. However, the feedless patch symmetric axis of 8 overlaps the feed patch symmetric axis of 7,
Power supply means using pins 10 is provided. A high-frequency electromagnetic field is supplied from a microstrip line composed of the microstrip line 3b, the spacer 4 and the ground plate 5 to the power supply patch through the pin 10.

FIG. 6 shows a fourth embodiment of the present invention.
(A) is a front view, (b) is a cross-sectional view of X1-X2, ( c )
Is an exploded perspective view. The configuration of this microstrip antenna is the same as that of the first embodiment. However, the power supply method is power supply by the pin 10.

FIG. 7 shows a fifth embodiment of the present invention.
(A) is a front view, (b) is a cross-sectional view of X1-X2, ( c )
Is an exploded perspective view. The configuration of this microstrip antenna is the same as that of the first embodiment. However, the power supply method is based on the slot 11.

FIG. 8 is an exploded perspective view of a sixth embodiment of the present invention. This microstrip antenna is the same as that of the fifth embodiment. Films and spacers are used for the antenna material.

FIG. 9 is an exploded perspective view of a seventh embodiment of the present invention. This microstrip antenna is the same as that of the sixth embodiment, but the feeding method is the slot plate 25, the spacer 26, the feeding line 27, the spacer 32, and the ground plate 33.
And a radome 31 is used to protect the antenna.

FIG. 10 shows an eighth embodiment of the present invention, in which (a) is a front view, (b) is a sectional view taken along line X1-X2, and ( c ).
Is an exploded perspective view. The configuration of this microstrip antenna is the same as that of the second embodiment. However, pin 10
Power supply means. The obtained electric characteristics and the like are the same as those of the second embodiment.

FIG. 11 shows a ninth embodiment of the present invention, in which (a) is a front view, (b) is a cross-sectional view taken along X1-X2, and ( c ).
Is an exploded perspective view. This microstrip antenna includes a microstrip conductor 3 included in the feeding patch 3.
A high-frequency electromagnetic field on a linearly polarized wave is supplied from a microstrip line consisting of a b, a spacer 4 and a ground plate 5 to the radiation conductor 3a of the first rectangular conductor plate included in the power supply patch 3. The power supply patch 3 generates a right-handed circularly polarized electromagnetic field from the supplied high frequency electromagnetic field due to the effect of the pair of recesses 3d, 3d provided on the outer periphery of the radiation conductor 3a. That is, the direction of the radiated electric field 6 of the linearly polarized high-frequency electromagnetic field is
A recess 3d, 3d similar to the recesses 53a, 53b in FIG. 20 is provided at a position (angle α) in a clockwise direction of 45 ° (hereinafter referred to as the recesses 3d, 3d and the center of the feeding patch 3 and the passive feeding patch 1). A line connecting to a certain antenna center 9 is referred to as a feeding patch symmetric axis 7). A circularly polarized electromagnetic field is emitted in one direction of the parasitic patch 1 made of a conductive plate. The passive patch 1 receives the above-mentioned circularly polarized electromagnetic field on one side and re-radiates the circularly polarized electromagnetic field from the other side.

In this microstrip antenna, concave portions 1a and 1b, in which a part of the apexes of the rectangular conductors are missing, are provided at a pair of opposing apexes of the rectangular conductor of the parasitic patch 1, so that the elliptical polarization rate is broadened and the return loss is increased. And the best frequency of the elliptical polarization rate are matched. The recesses 1a and 1b correspond to the recesses 3c and 3d of the feeding patch, and the positions of the recesses 1a and 1b are on the parasitic patch symmetric axis 8 rotated by an excessive β counterclockwise from the feeding patch symmetric axis 7. It is in. The angle β between the feeding patch symmetric axis 7 and the parasitic feeding patch symmetric axis 8 is
It depends on dimensional parameters such as a and 1b. As an example, it is necessary to increase the angle β as the thickness of the spacer 2 increases. Conversely, if the thickness of the spacer 2 is close to zero, the angle may be almost zero.

FIG. 11 shows a microstrip antenna for right-handed circular polarization. In order to use left-handed circularly polarized light, the feeding patch symmetric axis 7 is aligned with the direction of the radiated electric field 6 as is well known. Concave portions 3d and 3d are formed to be on opposite sides. Therefore, the concave portions 1a and 1b of the passive patch 1 are also formed on the same side as the concave portions 3d and 3d. At this time, the non-feeding patch symmetry axis 8 is rotated clockwise from the feeding patch symmetry axis 7. Furthermore, the components of this microstrip antenna may be composed of different parts, respectively.
( C ) As shown in the figure, the passive patch 1 and the spacer 2
And an integral dielectric substrate, and a power supply patch 3 and a spacer 4
The ground and the ground 5 may be constituted by separate integrated substrates.

FIGS. 12A and 12B are configuration diagrams of a tenth embodiment of the present invention. FIG. 12A is a front view, and FIG.
FIG. FIG. 13 is an exploded perspective view showing this embodiment in further detail. Referring to FIG. 12 and FIG. 13, this microstrip antenna
With the exception of 3, it almost corresponds to the microstrip antenna of FIG. That is, the spacers 22, 24, and 26, the slot plate 25, the feed line 27, the radome 31, the spacer 32, and the ground plate 33, which are the components of the antenna of this embodiment, are exactly the same as those in FIG. The direction 28 and the feeding patch symmetry axis 29 have the same meaning as in FIG.

Here, the size of the power supply patch 23 is such that one side of the rectangular upper conductive plate is 68.5 mm, and the concave portions 23a and 23
b is 2 which is 17.95 apart from the top of the square conductor
The conductive plate is broken by connecting the two
And 23d are those obtained by expanding the above-mentioned conductor plate from the apex by a width of 23.7 mm. However, it can be considered that the operation of generating the circularly polarized electromagnetic field by the feeding patch 23 is almost the same as that of the microstrip antenna according to the prior art shown in FIG. The passive patch is the same as that in FIG. Further, the components of this microstrip antenna may be composed of different components as shown in FIG.

The measurement results of the elliptical polarization rate and the return loss for the tenth embodiment shown in FIG. 12 are exactly the same as the results shown in FIG. The frequency bands indicating the loss match.

FIG. 14 shows an eleventh embodiment of the present invention, in which (a) is a front view, (b) is a sectional view taken along line X1-X2, and ( c ) is an exploded perspective view. The configuration of this microstrip antenna is the same as that of the ninth embodiment, however, the feeding patch symmetric axis 8 of 7 overlaps, and the feeding means by the pin 10 is used.

FIG. 15 shows a twelfth embodiment of the present invention.
(A) is a front view, (b) is a cross-sectional view of X1-X2, ( c ).
Is an exploded perspective view. The configuration of this microstrip antenna is the same as that of the ninth embodiment. However, the power supply method is power supply by the pin 10.

FIG. 16 shows a thirteenth embodiment of the present invention.
(A) is a front view, (b) is a cross-sectional view of X1-X2, ( c ).
Is an exploded perspective view. The configuration of this microstrip antenna is the same as that of the ninth embodiment. However, the power supply method is based on the slot 11.

FIG. 17 is an exploded perspective view of a fourteenth embodiment of the present invention. This microstrip antenna is the thirteenth
This is the same as the embodiment. Films and spacers are used for the antenna material.

FIG. 18 is an exploded perspective view of a fifteenth embodiment of the present invention. This microstrip antenna is
The power supply method is the same as that of the embodiment, but has a triplate structure using a slot plate 25, a spacer 26, a power supply line 27, a spacer 32, and a ground van 33, and uses a radome 31 to protect the antenna surface. ing.

FIG. 19 shows a sixteenth embodiment of the present invention, in which (a) is a front view, (b) is a cross-sectional view taken along line X1-X2, and ( c ).
Is an exploded perspective view. The structure of this microstrip antenna is the same as that of the tenth embodiment, but the feeding means by the pin 10 is used. The obtained electrical characteristics etc.
This is the same as the embodiment.

[0045]

As described above, the present invention relates to a microstrip antenna for circularly polarized waves for widening the elliptical polarization rate by using a parasitic patch. A rectangular conductor plate having a concave portion or a convex portion formed at the apex corresponding to the concave portion or the convex portion is used, and the symmetry axis of the feeding patch and the symmetry axis of the non-feeding patch are determined according to the parameters of the antenna. since the angle of being rotated, elliptical polarization rate and Rita - not the frequency band of each respective Nrosu only can a wide band, the elliptically polarized wave ratio and Rita - match the frequency band of good characteristics can be obtained with Nrosu As a result, there is an effect that a practically wide band microstrip antenna can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention, and (a)
The figure is a front view, the figure (b) is a sectional view taken along the line X1-X2 of the figure (a),
( C ) is an exploded perspective view.

FIG. 2 is a configuration diagram of a second embodiment of the present invention, and (a)
The figure is a front view, and the figure (b) is a sectional view taken along line Y1-Y2 of the figure (a).

FIG. 3 is an exploded perspective view showing the embodiment of FIG. 2 in further detail;

FIG. 4 is a diagram showing measurement results of the elliptical polarization rate and the return loss of the second embodiment.

FIG. 5 is a configuration diagram of a third embodiment of the present invention, wherein (a)
The figure is a front view, the figure (b) is a sectional view taken along the line X1-X2 of the figure (a),
( C ) is an exploded perspective view.

FIG. 6 is a configuration diagram of a fourth embodiment of the present invention, wherein (a)
The figure is a front view, the figure (b) is a sectional view taken along the line X1-X2 of the figure (a),
( C ) is an exploded perspective view.

FIG. 7 is a configuration diagram of a fifth embodiment of the present invention, wherein (a)
The figure is a front view, the figure (b) is a sectional view taken along the line X1-X2 of the figure (a),
( C ) is an exploded perspective view.

FIG. 8 is an exploded perspective view of a sixth embodiment of the present invention.

FIG. 9 is an exploded perspective view of a seventh embodiment of the present invention.

FIG. 10 is a configuration diagram of an eighth embodiment of the present invention;
(A) is a front view, (b) is an X1-X2 cross-sectional view of (a), and ( c ) is an exploded perspective view.

FIG. 11 is a configuration diagram of a ninth embodiment of the present invention;
(A) is a front view, (b) is an X1-X2 cross-sectional view of (a), and ( c ) is an exploded perspective view.

FIG. 12 is a configuration diagram of a tenth embodiment of the present invention;
(A) is a front view, and (b) is a sectional view taken along line Y1-Y2 of (a).

FIG. 13 is an exploded perspective view showing the embodiment of FIG. 12 in further detail.

FIG. 14 is a configuration diagram of an eleventh embodiment of the present invention;
(A) is a front view, (b) is an X1-X2 cross-sectional view of (a), and ( c ) is an exploded perspective view.

FIG. 15 is a configuration diagram of a twelfth embodiment of the present invention;
(A) is a front view, (b) is an X1-X2 cross-sectional view of (a), and ( c ) is an exploded perspective view.

FIG. 16 is a configuration diagram of a thirteenth embodiment of the present invention;
(A) is a front view, (b) is an X1-X2 cross-sectional view of (a), and ( c ) is an exploded perspective view.

FIG. 17 is an exploded perspective view of a fourteenth embodiment of the present invention.

FIG. 18 is an exploded perspective view of a fifteenth embodiment of the present invention.

FIG. 19 is a configuration diagram of a sixteenth embodiment of the present invention;
(A) is a front view, (b) is an X1-X2 cross-sectional view of (a), and ( c ) is an exploded perspective view.

FIGS. 20A and 20B are configuration diagrams of a microstrip antenna according to the related art, where FIG. 20A is a front view and FIG.
The figure is a sectional view taken along the line Z1-Z2, and the figure ( c ) is a detailed exploded perspective view.

FIG. 21 is a diagram showing the measurement results of the elliptical polarization and the return loss of the microstrip antenna of FIG. 20;

Claims (8)

(57) [Claims] 1. A power supply patch for receiving a supply of high-frequency power and radiating a circularly polarized electromagnetic field from one surface of a circular conductor plate, power supply means for supplying the high-frequency power to the power supply patch, and a power supply patch. A passive patch that receives the circularly polarized electromagnetic field on one surface and re-radiates the circularly polarized electromagnetic field from the other surface; and a circularly polarized microstrip antenna, wherein the power supply patch is formed of the circular conductor plate. On a circumference, a pair of recesses formed at approximately 45 ° clockwise or counterclockwise with respect to the direction of a straight line connecting the feeding end of the high-frequency power and the center of the circular conductor plate, or Wherein the parasitic patch is a rectangular conductive plate provided on one surface of the circular conductive plate, and the rectangular conductive plate has Formed in pairs The rectangular conductor plate has either a pair of concave portions or a pair of convex portions of the same, and the rectangular conductor plate has a target axis for a parasitic patch connecting the pair of concave portions or convex portions of the rectangular conductor plate and a concave portion of the power supply patch. Or it is characterized in that the microstrip antenna is attached by being rotated by a predetermined angle so that the angle formed by the feeding patch symmetric axis connecting the pair of convex portions matches the return loss of the microstrip antenna and the best frequency band of the elliptical polarization rate. Microstrip antenna for circular polarization. 2. When the circularly polarized electromagnetic field radiated by the feeding patch is a right-handed circularly polarized electromagnetic field, a passive patch symmetric axis connecting a pair of the convex portions or the concave portions of the rectangular conductor plate is: When the feeding patch is rotated counterclockwise with respect to a feeding patch symmetry axis connecting a pair of concave or convex portions, and the circularly polarized electromagnetic field emitted by the feeding patch is a left-handed circularly polarized electromagnetic field. The passive patch symmetric axis connecting the pair of the convex portions or the concave portions of the rectangular conductor plate is rotated clockwise with reference to the power supply patch symmetric axis connecting the pair of the concave portions or the convex portions of the power supply patch. The microstrip antenna according to claim 1, wherein: 3. A power supply patch that receives a supply of high-frequency power and radiates a circularly polarized electromagnetic field from one surface of a circular conductor plate, a power supply unit that supplies the high-frequency power to the power supply patch, and a power supply patch. A passive patch that receives the circularly polarized electromagnetic field on one surface and re-radiates the circularly polarized electromagnetic field from the other surface; and a circularly polarized microstrip antenna, wherein the power supply patch is formed of the circular conductor plate. A pair of recesses formed on the circumference at approximately 45 ° either clockwise or counterclockwise with respect to the direction of a straight line connecting the feeding end of the high-frequency power and the center of the circular conductor plate; A pair of projections that are perpendicular to a feeder patch symmetrical line connecting the pair of recesses and are formed on a line passing through the center of the antenna, wherein the parasitic patch is provided to face one surface of the circular conductive plate. Was A rectangular conductor plate, wherein the rectangular conductor plate corresponds to a pair of concave portions formed at a pair of vertexes facing each other corresponding to a pair of concave portions of the power supply patch, and corresponds to a pair of convex portions of the power supply patch. And a pair of protrusions formed in another pair of vertices facing each other, and when the circularly polarized electromagnetic field radiated by the feeding patch is a right circularly polarized electromagnetic field,
The passive patch symmetric axis connecting the pair of convex portions or concave portions of the rectangular conductor plate has a counterclockwise direction with respect to the feed patch symmetric axis connecting the pair of concave portions or convex portions of the power supply patch. Rotation is performed to match the best frequency band of the return loss and the elliptical polarization rate, and when the circularly polarized electromagnetic field radiated by the feeding patch is a left-handed circularly polarized electromagnetic field, the rectangular conductor plate The symmetric axis of the parasitic patch connecting the pair of convex portions or concave portions is formed such that the return loss and the elliptical polarization of the microstrip antenna are clockwise with respect to the symmetric axis of the feeding patch connecting the pair of concave portions or convex portions of the feed patch. A microstrip antenna for circularly polarized waves, which is rotated so as to coincide with the best frequency band. 4. The power feeding means is a slot line electromagnetically connected to the other surface of the circular conductor plate, and the feeding patch, the non-feeding patch, and the slot surrounding conductor of the slot line are formed of a dielectric film. 4. The microstrip antenna according to claim 3 , wherein the microstrip antenna is formed thereon. 5. A power supply patch that receives a supply of high-frequency power and radiates a circularly polarized electromagnetic field from one surface of the first rectangular conductor plate, a power supply unit that supplies the high-frequency power to the power supply patch, and the power supply. A passive patch that receives the circularly polarized electromagnetic field from one side of the patch and re-radiates the circularly polarized electromagnetic field from the other side; and a circularly polarized microstrip antenna, It has either a pair of concave portions or a pair of convex portions formed in a pair, wherein the parasitic patch is the first rectangular conductor plate, and the second rectangular conductor plate has a pair of vertexes opposed to each other. And the first rectangular conductor plate is connected to a pair of the concave or convex portions of the first rectangular conductor plate. Patch symmetry axis and the feeding patch The microstrip antenna is attached by being rotated by a predetermined angle so that the angle formed between the feeding patch symmetrical axis connecting a pair of the concave portions or the convex portions and the best frequency band of the return loss and the elliptical polarization of the microstrip antenna coincide with each other. Microstrip antenna for circular polarization. 6. A parasitic patch symmetrical connecting a pair of said convex portions or concave portions of said second rectangular conductor plate when said circularly polarized electromagnetic field emitted by said feeding patch is a right-handed circularly polarized electromagnetic field. The axis is rotated in a counterclockwise direction with respect to an axis of symmetry of the feeding patch connecting a pair of concave or convex portions of the parasitic patch, and a circularly polarized electromagnetic field emitted by the feeding patch is a left-handed circularly polarized electromagnetic field. In this case, the non-feeding patch symmetric axis connecting the pair of the convex portions or the concave portions of the second rectangular conductor plate is clockwise with respect to the feeding patch symmetric axis connecting the pair of the concave portions or the convex portions of the feeding patch. The microstrip antenna according to claim 5 , wherein the microstrip antenna is rotated. 7. A power supply patch for receiving a supply of high-frequency power and radiating a circularly polarized electromagnetic field from one surface of the first rectangular conductor plate, a power supply means for supplying the high-frequency power to the power supply patch, A microstrip antenna for circular polarization, comprising: a parasitic patch that receives the circularly polarized electromagnetic field on one surface from a power supply patch and re-radiates the circularly polarized electromagnetic field from the other surface. A pair of concave portions formed on a pair of apexes, and a pair of convex portions formed on a pair of another apex, wherein the parasitic patch is provided to face one surface of the first rectangular conductor plate. A second rectangular conductor plate, wherein the second rectangular conductor plate has a pair of recesses formed at a pair of vertices opposed to each other corresponding to the pair of recesses of the power supply patch, and a pair of recesses formed of the power supply patch. Corresponding to a pair of protrusions A pair of convex portions formed in another pair of facing vertices, and when the circularly polarized electromagnetic field emitted by the power supply patch is a right-handed circularly polarized electromagnetic field, the second rectangular conductor plate The return loss and the elliptically polarized wave of the microstrip antenna in a counterclockwise direction with respect to the feeding patch symmetric axis connecting the pair of the concave portions or the projecting portions of the feeding patch. Is rotated so as to match the best frequency band of the ratio, and when the polarized electromagnetic field emitted from the feeding patch is a left-handed circularly polarized electromagnetic field, the convex portion of the second rectangular conductor plate or The passive patch symmetric axis connecting the pair of concave portions has a return loss and an elliptical polarization rate of the microstrip antenna clockwise with respect to the feed patch symmetric axis connecting the concave portion or the convex portion of the feed patch. Microstrip antenna for circularly polarized wave, characterized in that it is rotated to match the best frequency band. 8. The power supply means is a slot line electromagnetically connected to the other surface of the first rectangular conductor plate, and the power supply patch, the non-power supply patch, and the slot surrounding conductor of the slot line are: 8. The microstrip antenna according to claim 7, wherein the antenna is formed on a dielectric film.