JPH06232627A - Microstrip antenna - Google Patents

Abstract

PURPOSE:To make a band of a circularly polarized wave use microstrip antenna braod by making a frequency band with best elliptic polarization rate coincident with a frequency band with better return loss. CONSTITUTION:The microstrip antenna includes a feeding patch 3 including a circular radiation conductor 3a fed from a microstrip conductor 3b and a parasitic patch 1 of a square conductor plate shape opposite to the feeding patch 3. The feeding patch 3 produces a right circularly polarized wave electromagnetic field by the effect of a couple of recessed parts 3c, 3d provided on the circumference of the radiation conductor 3a. Moreover, the recessed parts 1a, 1b are provided at a couple of vertexes of the square conductor to face each other and are located on a parastic patch symmetrical axis 8 rotated by an angle beta counter clockwise from a feeding patch symmetrical axis 7 and the angle beta depends on a size parameter or the like of a spacer 2 and the recessed parts 1a, 1b or the like.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Heretofore, a microstrip antenna of this type has been disclosed in an open patent publication (invention name: microstrip antenna, patent application publication: Hei 3-145305, publication: June 20, 1991). There is. The disclosed microstrip antenna is fed from a microstrip line or slot line. FIG. 20 is a configuration diagram of a microstrip antenna manufactured by the inventor of the present application in accordance with the contents of the specification of this publication. Here, the figure (a) is a front view, the figure (b) is Z1- of a figure (a).
Z2 sectional drawing and (c) figure are detailed disassembled perspective views.

The microstrip antenna shown in FIG.
A linearly polarized high-frequency electromagnetic field is supplied from the slot line including the power feeding line 57, the spacer 56, and the slot plate 55 forming the slot 55a to the power feeding patch 53 of the circular conductor plate. The power feeding patch 53 includes a pair of concave portions (partially lacking portions of the circular conductor plate) 53a and 53b and a pair of convex portions (area increasing portion of the circular conductor plate) 53c, which are provided on the circumference of the conductor plate.
Due to the effect of 53d, a right circular polarized electromagnetic field is generated from the supplied high frequency electromagnetic field. That is, from the radiated electric field direction 58 of the linearly polarized high-frequency electromagnetic field to the clockwise direction 4 in FIG.
Recesses 53a and 53b are provided at a position of 5 ° (hereinafter, a line connecting both recesses 53a and 53b is referred to as a feeding patch symmetry axis 59), and a counterclockwise direction is 45 ° from a radiated electric field direction 58.
Position on the circumference of (in other words, orthogonal to the feeding patch symmetry axis 59)
When the convex portions 53c and 53d are provided on the
Radiates a circularly polarized electromagnetic field in the direction of one surface of the circular parasitic patch 51 facing each other. The parasitic patch 51 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, the parasitic patch 51 has a recess 53 similar to the feeding patch 53.
The concave portions 51a and 51b are provided at substantially corresponding positions of a and 53b, and the convex portions 51c and 53d are provided at substantially corresponding positions of the convex portions 53c and 53d.
51d is provided, and elliptical polarization rate (Axial Ratio)
We are aiming for a wider band.

The microstrip antenna shown in FIG.
The parasitic patch 51, the feeding patch 53, the slot 55a and the feeding line 57 are formed on the PET films 511, 531, 55 and 571 made of thin polyester copper clad laminates, respectively, and the PET films 511 and 531 Between the PET films 531 and 55, and between the PET films 55 and 571,
Spacers 52, 54 and 56 made of expanded polyethylene sheets each having a relative dielectric constant of 1.1 are arranged.
Further, in this microstrip antenna, the PET film 511 (and thus the parasitic patch 51) is covered with the radome 61 made of a dielectric material, and the PET film 571 is covered with the spacer 62 similar to the above, and is covered with the ground plate 63. It protects the functional elements of the antenna.

The microstrip antenna of FIG. 20 manufactured for measuring the elliptic polarization rate and the return loss has a feeding patch 53 with a circle radius of 37.5 mm and a recess 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 protruding height of each of the protrusions 51a and 51b is 5.8 m from the circumferential line.
m, the protrusion width is 19.2 mm. Further, the circular radius of the parasitic patch 51 is 34.5 mm, and the concave portions 51a and 51b are
The maximum cutting depth of each is 6.8 mm from the circumferential line, and the cutting width is 13.7 mm. In this antenna, the radius of the parasitic patch 53 is made slightly smaller than that of the feeding patch 51 in order to improve the elliptic polarization rate and the return loss. The spacers 52 and 54 have a thickness of 10 mm and 3 mm, respectively.

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

In this microstrip antenna, the frequency showing the best elliptic polarization rate is about 1.68 GHz and the frequency showing the best return loss is about 1.57 GHz, and there is a deviation of about 7% between them. If the characteristics required for practical use of the circular polarization microstrip antenna are elliptical polarization rate of 4 dB or less and return loss of 12 dB (mismatch loss of 0.3 dB) or less, this antenna is Even though each has a frequency band satisfying the required characteristics of about 80 MHz, since the frequencies exhibiting the best characteristics of both antennas are deviated, there is no bandwidth that satisfies both the antenna required characteristics. The deviation between the frequency characteristics of the elliptic 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 method of feeding the antenna does not represent a significant difference in the frequency characteristics of the elliptic polarization rate and the return loss.

[0009]

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

[0010]

A circularly polarized microstrip antenna according to the present invention includes a feeding patch for receiving a high-frequency power and radiating a circularly polarized electromagnetic field from one surface of a circular conductor plate. Circularly polarized wave provided with a power feeding means for supplying the high frequency power to the power feeding patch, and a parasitic patch for receiving the circularly polarized electromagnetic field from the feeding patch on one surface and re-radiating the circularly polarized electromagnetic field from the other surface. In the microstrip antenna described above, the feeding patch is 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 on the circumference of the circular conductor plate. A pair of concave portions formed at any of approximately 45 ° positions, or a same convex portion, or a pair of concave portions and a pair of concave portions formed at approximately 45 ° positions in the clockwise and counterclockwise directions, respectively. A pair of convex portions, having any one, the parasitic patch is a rectangular conductor plate provided facing one surface of the circular conductor plate, the rectangular conductor plate, It has either a pair of concave portions formed in a pair of apexes facing each other, a pair of convex portions same as the above, or a pair of concave portions and a pair of convex portions formed in two pairs of apexes facing each other. The concave portion of the power feeding patch corresponds to the concave portion of the parasitic patch, and the convex portion of the feeding patch corresponds to the convex portion of the parasitic patch.

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 symmetry connecting a pair of the convex portion or the concave portion of the rectangular conductor plate. The axis is rotated counterclockwise with reference to the symmetry axis of the feeding patch connecting a pair of concave or convex portions of the feeding patch, and the circularly polarized electromagnetic field radiated by the feeding patch is a left circularly polarized electromagnetic field. In some cases, the parasitic patch symmetry axis connecting the pair of convex portions or concave portions of the rectangular conductor plate is rotated clockwise with respect to the feeding patch symmetry axis connecting the pair of concave portions or convex portions of the power feeding patch. There is.

Further, in one mode of the feeding patch and the non-feeding patch in the microstrip antenna, the feeding patch is such that the feeding end of the high frequency power and the circular conductor plate are provided on the circumference of the circular conductor plate. A pair of recesses formed at positions of approximately 45 ° either clockwise or counterclockwise with respect to the direction of the straight line connecting the center and a feed patch symmetry line connecting the pair of recesses, and passing through the center of the antenna. A pair of convex portions formed on a line, the parasitic patch is a rectangular conductor plate provided to face one surface of the circular conductor plate, the rectangular conductor plate, A pair of concave portions formed in a pair of apexes facing each other corresponding to a pair of concave portions of the power feeding patch, and a pair of concave portions formed in another pair of apexes facing each other corresponding to a pair of convex portions of the power feeding patch. And a convex portion.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a constitutional view of a first embodiment of the present invention, in which (a) is a front view and (b) is (a) X1-X.
2 is a cross-sectional view, and (c) is an exploded perspective view.

In this microstoip antenna, a microstrip line composed of a microstrip conductor 3b included in the feeding patch 3, a spacer 4 and a ground plate 5 is linearly connected to a radiation conductor 3a of a circular conductor plate included in the feeding patch 3. Supply a polarized high-frequency electromagnetic field. The feeding patch 3 produces a right-handed circularly polarized electromagnetic field from the supplied high-frequency electromagnetic field due to the effect of the pair of recesses 3c and 3d provided on the conductor circumference of the radiation conductor 3a. That is, in the feeding patch 3, the concave portion 53 of FIG. 20 is provided at a position (angle α) of 45 ° in the clockwise direction from the radiating electric field direction 6 of the linearly polarized high-frequency electromagnetic field.
The recesses 3c and 3d similar to a and 53b are provided (hereinafter, the line connecting these recesses 3c and 3d to the antenna center 9 which is the center of the feeding patch 3 and the parasitic patch 1 is referred to as the feeding patch symmetry axis 7). The feeding patch 3 radiates a circularly polarized electromagnetic field in one direction of the parasitic patch 1 made of opposing rectangular conductor plates through the dielectric spacer 2 far from the foamed polyethylene sheet. The parasitic 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 part of the conductors at the vertices are cut are provided at a pair of vertices of the rectangular conductor of the parasitic patch 1 which are opposed to each other, so that the elliptic polarizability is widened, and The best frequency of return loss and the best frequency of this elliptic polarization are matched. These recesses 1a and 1b are recesses 3c and 3 of the power feeding patch.
Corresponding to d, the positions of the recesses 1a and 1b are on the parasitic patch symmetry axis 8 rotated from the feeding patch symmetry axis 7 by the angle β in the counterclockwise direction. This feeding patch symmetry axis 7
The angle β formed by the non-feed patch symmetry axis 8 differs depending on the dimension parameters of the spacer 2, the recesses 1a, 1b, and the like. As an example, it is necessary to increase the angle β as the thickness of the spacer 2 increases. On the contrary, if the thickness of the spacer 2 is close to 0, the angle β may be almost 0.

Note that FIG. 1 shows a microstrip antenna for right-handed circularly polarized waves. For left-handed circularly polarized waves, as is well known, the feeding patch symmetry axis 7 is opposite to the radiation field direction 6 in this figure. The concave portions 3c and 3d are formed so as to be on the side. 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 parasitic patch symmetry axis 8 is rotated clockwise from the feeding patch symmetry axis 7.

Further, the constituent elements of the microstrip antenna may be composed of separate parts,
(C) The parasitic patch 1 and the spacer 2 as shown in FIG.
Integrated dielectric substrate, and power feeding patch 3 and spacer 4
The ground and the ground 5 may be formed of different integrated boards.

FIG. 2 is a constitutional view of a second embodiment of the present invention, in which (a) is a front view and (b) is Y1-Y in (a).
It is 2 sectional drawing. FIG. 3 is an exploded perspective view showing this embodiment in more detail.

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

That is, the spacers 22, 24, 26, the slot plate 25, the feed line 27, the radome 31, the spacer 32, and the ground plate 33, which are the constituent elements of the antenna of this embodiment, are spacers 52, 54, 56, and a slot, respectively. It is the same as the plate 55, the feeding line 27, the radome 31, the spacer 32, and the ground plate 33, and the radiation field direction 28 and the feeding patch symmetry axis 29 also have the same meanings as the radiation field direction 58 and the feeding patch symmetry axis 59.
Here, the size of the power feeding patch 23 is such that the circular radius of the conductor plate is substantially the same as that of the power feeding patch 53, but the recess 23
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 protrusions 21a and 21b is 8.8 m from the performance line.
m, the protrusion width is changed to 17.6 mm. However, the operation of generating the circularly polarized electromagnetic field by the power feeding patch 23 is as shown in FIG.
It can be considered almost the same as the microstrip antenna according to the related art of No. 0.

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

Also in the microstrip antennas of FIGS. 2 and 3, the positions of the recesses 21a and 21b are on the parasitic patch symmetry axis 30 rotated counterclockwise by the angle 7 from the feeding patch corresponding axis 29. The angle γ formed by the symmetry axis 29 of the feeding patch and the symmetry axis 30 of the non-feeding patch also varies depending on the dimension parameters of the spacer 22, the recesses 21a, 21b, and the like. The manner in which this angle γ changes and the rotation direction of the parasitic patch symmetry axis 30 depending on the direction of the circularly polarized electromagnetic field are also shown in FIG.
It is similar to the embodiment of.

Further, the constituent elements of the microstrip antenna may be composed of separate parts as shown in FIG. 3, and the parasitic patch 21 and the spacer 22 are also included.
It is needless to say that the power supply patch 23 and the spacer 24, and the slot plate 25, the spacer 26, and the ground 5 may be configured by different integrated substrates.

FIG. 4 is a diagram showing the results of measuring the elliptic polarization rate and the return loss for 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 a side of 61 mm, and the recesses 21a and 21b.
Cuts the conductor plate by connecting two points 14 mm apart from the apex of the rectangular conductor, and the projections 21c and 21d are formed by expanding the conductor plate by a width of 16.2 mm from the apex. The rotation angle γ of the parasitic patch symmetry axis 30 with respect to the feeding patch symmetry axis 29 is set to 30 °.

This measurement microstrip antenna is
The frequency that shows the best elliptic polarization is approximately 1.59 GHz,
The center of the frequency showing a good return loss is almost the same frequency, and both frequencies are almost the same. Further, about 90 MHz is obtained for the frequency band having an elliptic polarization rate of 4 dB or less, and 180 MHz is obtained for the frequency band having a return loss of -12 dB or less. Therefore, the frequency band satisfying the required characteristics of this antenna is substantially determined by the frequency band satisfying the elliptic polarization ratio of 4 dB or less, and there is no limitation of the use band due to the limitation of return loss unlike the conventional microstrip antenna. .

FIG. 5 shows a third embodiment of the present invention,
(A) A front view, (b) is a sectional view of X1-X2, and (c) is an exploded perspective view. The structure of this microstrip antenna is the same as that of the first embodiment. However, the symmetrical axis of the parasitic patch of 8 overlaps the symmetrical axis of the patch of 7
The power supply means by the pin 10 is used. A high-frequency electromagnetic field is supplied from the microstrip line 3b, the spacer 4, and the ground plate 5 to the feeding patch through the pin 10 from the microstrip line.

FIG. 6 shows the fourth embodiment of the present invention.
(A) is a front view, (b) is a sectional view of X1-X2, (c)
FIG. 3 is an exploded perspective view. The structure of this microstrip antenna is the same as that of the first embodiment. However, the power feeding method is power feeding through the pin 10.

FIG. 7 shows a fifth embodiment of the present invention,
(A) is a front view, (b) is a sectional view of X1-X2, (c)
FIG. 3 is an exploded perspective view. The structure of this microstrip antenna is the same as that of the first embodiment. However, the power feeding method is based on the slot 11.

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

FIG. 9 is an exploded perspective view of the seventh embodiment of the present invention. This microstrip antenna is the same as 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.
Has a triplate structure and uses a radome 31 to protect the antenna.

FIG. 10 shows an eighth embodiment of the present invention, (a) is a front view, (b) is a sectional view taken along line X1-X2, and (c).
FIG. 3 is an exploded perspective view. The structure of this microstrip antenna is the same as that of the second embodiment. But pin 10
The power supply means is taken by. The obtained electrical characteristics and the like are the same as in Example 2.

FIG. 11 shows a ninth embodiment of the present invention. (A) is a front view, (b) is a sectional view taken along line X1-X2, (c).
FIG. 3 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 the microstrip line composed of b, the spacer 4, and the ground plate 5 to the radiation conductor 3a of the first rectangular conductor plate included in the feeding patch 3. The feeding patch 3 produces a right-handed circularly polarized electromagnetic field from the supplied high-frequency electromagnetic field due to the effect of the pair of recesses 3c and 3d provided on the outer circumference of the conductor of the radiation conductor 3a. In other words, the radiation field direction 6 of the linearly polarized high-frequency electromagnetic field is applied to the feeding patch 3.
20 is provided at a position (angle α) in the clockwise direction of 45 ° from the recesses 3c and 3d similar to the recesses 53a and 53b of FIG. A line connecting to a certain antenna center 9 is defined as a feed patch symmetry axis 7. This feed patch 3 is composed of a second rectangular conductor plate facing each other through a dielectric spacer 2 made of the foamed polyethylene sheet or the like. A circularly polarized electromagnetic field is radiated in one direction of the parasitic patch 1. The parasitic patch 1 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, recesses 1a and 1b in which a part of the conductors at the vertices are removed are provided at a pair of vertices of the rectangular conductors of the parasitic patch 1 which are opposed to each other, thereby widening the elliptic polarization rate and returning loss. The best frequency of is matched with the best frequency of this elliptic polarization. The concave portions 1a and 1b correspond to the concave portions 3c and 3d of the feeding patch, and the positions of the concave portions 1a and 1b are on the parasitic patch symmetry axis 8 which is rotated counterclockwise from the feeding patch symmetry axis 7 by excessive β. It is in. The angle β formed between the feeding patch symmetry axis 7 and the parasitic patch symmetry axis 8 is determined by the spacer 2 and the recess 1.
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. On the contrary, if the thickness of the spacer 2 is close to 0, the angle may be almost 0.

FIG. 11 shows a microstrip antenna for right-handed circularly polarized waves. For left-handed circularly polarized waves, the feed patch symmetry axis 7 is opposite to the radiation field direction 6 in this figure, as is well known. The concave portions 3c and 3d are formed so that 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 parasitic patch symmetry axis 8 is rotated clockwise from the feeding patch symmetry axis 7. Furthermore, the constituent elements of this microstrip antenna may be composed of separate parts,
(C) The parasitic patch 1 and the spacer 2 as shown in FIG.
Integrated dielectric substrate, and power feeding patch 3 and spacer 4
The ground and the ground 5 may be formed of different integrated boards.

FIG. 12 is a constitutional view of a tenth embodiment of the present invention, in which (a) is a front view and (b) is Y1-Y in (a).
It is 2 sectional drawing. FIG. 13 is an exploded perspective view showing this embodiment in more detail. Referring to FIG. 12 and FIG. 13, this microstrip antenna has a feeding patch 2
It corresponds to the microstrip antenna of FIG. 2 except for 3. That is, the spacers 22, 24, 26, the slot plate 25, the feed line 27, the radome 31, the spacer 32, and the ground plate 33, which are the constituent elements of the antenna of this embodiment, are exactly the same as those in FIG. The direction 28 and the feeding patch symmetry axis 29 also have the same meanings as in FIG.

Here, the size of the feeding patch 23 is such that one side of the rectangular upper conductor plate is 68.5 mm, and the recesses 23a and 23 are formed.
b is 2 which is 17.95 from the top of the rectangular conductor.
The conductor plate is broken by connecting two points, and the convex portion 23c
And 23d are obtained by expanding the conductor plate by a width of 23.7 mm from the apex. 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 conventional microstrip antenna shown in FIG. The parasitic patch is the same as that of FIG. 2 regarding the configuration, the positional relationship with the feeding patch, and the dimensions of each shape portion. Further, the constituent elements of the microstrip antenna may be composed of separate parts as shown in FIG.

The measurement results of the elliptic polarization rate and the return loss for the tenth embodiment shown in FIG. 12 are exactly the same as the results shown in FIG. 4, and the frequency band showing the best elliptical polarization rate and a good return. The frequency bands indicating the loss match.

FIG. 14 is an eleventh embodiment of the present invention, (a) is a front view, (b) is a 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 ninth embodiment, but the feeding patch symmetry axis 7 of 7 is overlapped, and the feeding means by the pin 10 is taken.

FIG. 15 shows a twelfth embodiment of the present invention.
(A) is a front view, (b) is a cross-sectional view taken along line X1-X2, (c).
FIG. 3 is an exploded perspective view. The structure of this microstrip antenna is the same as that of the ninth embodiment. However, the power feeding method is power feeding through the pin 10.

FIG. 16 shows a thirteenth embodiment of the present invention,
(A) is a front view, (b) is a cross-sectional view taken along line X1-X2, (c).
FIG. 3 is an exploded perspective view. The structure of this microstrip antenna is the same as that of the ninth embodiment. However, the power feeding method is based on the slot 11.

FIG. 17 is an exploded perspective view of the fourteenth embodiment of the present invention. This microstrip antenna is the thirteenth
Is the same as the embodiment described above. A film and a spacer are used for the antenna material.

FIG. 18 is an exploded perspective view of the fifteenth embodiment of the present invention. This microstrip antenna is the 14th
As in the embodiment, the feeding method is a triplate structure using the slot plate 25, the spacer 26, the feeding line 27, the spacer 32, and the ground van 33, and the radome 31 is used to protect the antenna surface. ing.

FIG. 19 shows a sixteenth embodiment of the present invention, (a) is a front view, (b) is a sectional view taken along line X1-X2, (c).
FIG. 3 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 adopted. The obtained electrical characteristics are the second
It is similar to the embodiment of.

[0045]

As described above, according to the present invention, in the microstrip antenna for circular polarization, which uses the parasitic patch to widen the band of the elliptic polarization rate, the parasitic patch or the concave portion of the feeding patch can be used as the parasitic patch. A rectangular conductor plate with concaves and convexes formed at the vertices corresponding to the convexes is used, and the angle between the symmetry axis of the feeding patch and the symmetry axis of the parasitic patch is rotated according to the parameters of this antenna. As a result, not only can the frequency bands of the elliptic polarization rate and the return loss ratio be widened, but the frequency bands in which the good characteristics of the elliptical polarization rate and the return loss can be obtained can be matched. As a result, there is an effect that a practical wideband microstrip antenna can be provided.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention, (a)
The figure is a front view, (b) is a sectional view taken along line X1-X2 of (a),
FIG. 7C is an exploded perspective view.

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

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

FIG. 4 is a diagram showing measurement results of elliptic polarizability and return loss of the second embodiment.

FIG. 5 is a configuration diagram of a third embodiment of the present invention, (a)
The figure is a front view, (b) is a sectional view taken along line X1-X2 of (a),
FIG. 7C is an exploded perspective view.

FIG. 6 is a configuration diagram of a fourth embodiment of the present invention, (a)
The figure is a front view, (b) is a sectional view taken along line X1-X2 of (a),
FIG. 7C is an exploded perspective view.

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

FIG. 12 is a configuration diagram of a tenth embodiment of the present invention,
7A is a front view, and FIG. 6B is a cross-sectional view taken along line Y1-Y2 of FIG.

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

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

20A and 20B are configuration diagrams of a microstrip antenna according to a conventional technique, in which FIG. 20A is a front view and FIG.
Z1-Z2 sectional drawing of a figure and (c) figure are detailed disassembled perspective views.

FIG. 21 is a diagram showing measurement results of elliptic polarizability and return loss of the microstrip antenna of FIG. 20.

[Explanation of symbols]

1, 21, 51 Parasitic patch 1a, 1b, 21a, 21b, 51a, 51b Recessed portion 21c, 21d, 51c, 51d Convex portion 2, 4, 22, 24, 26, 32, 52, 54, 56,
62 Spacer 3,23,53 Feeding patch 3a Radiating conductor 3b Microstrip conductor 3c, 3d, 21a, 21b, 53a, 53b Recess 23c, 23d, 53c, 53d Convex part 5, 33, 63 Ground plate 6, 28, 58 Radiating Electric field direction 7.29,59 Feed patch symmetry axis 8,30 Parasitic patch 9,30 Antenna center 25 Slot plate 25a Slot 31,61 Radome 211, 231, 271, 511, 531, 571
PET film 10 pins 10a Feed point 11 slots

Claims (16)

[Claims] 1. A power feeding patch which receives a high frequency power and radiates a circularly polarized electromagnetic field from one surface of a circular conductor plate, and a power feeding means which supplies the high frequency power to the power feeding patch.
In a circularly polarized microstrip antenna comprising a parasitic patch that receives the circularly polarized electromagnetic field from the feeding patch on one surface and re-radiates the circularly polarized electromagnetic field from the other surface, the feeding patch is the circular A pair formed on the circumference of the shaped conductor plate at approximately 45 ° either clockwise or counterclockwise with respect to the direction of the straight line connecting the feeding end of the high-frequency power and the center of the circular conductor plate. The concave patch, or the same convex portion, the parasitic patch is a rectangular conductor plate provided facing one surface of the circular conductor plate, the rectangular conductor plate, It has one of a pair of concave portions formed in a pair of facing vertices, or a pair of convex portions of the same, and the concave portion of the feeding patch corresponds to the concave portion of the parasitic patch, or the convex portion of the feeding patch. Is the unpowered part Microstrip antenna for circularly polarized waves characterized in that it corresponds to the convex portion of the switch. 2. When the circularly polarized electromagnetic field radiated by the feeding patch is a right-handed circularly polarized electromagnetic field, a parasitic patch symmetry axis connecting the pair of convex portions or concave portions of the rectangular conductor plate, When the circularly polarized electromagnetic field radiated by the feeding patch is a left-handed circularly polarized electromagnetic field, the circularly polarized electromagnetic field radiated by the feeding patch is rotated counterclockwise with respect to the symmetrical axis of the feeding patch connecting a pair of concave or convex portions of the feeding patch. , The parasitic patch symmetry axis connecting the pair of convex portions or concave portions of the rectangular conductor plate is rotated clockwise with respect to the symmetrical axis of the power feeding patch connecting the pair of concave portions or convex portions of the power feeding patch. The microstrip antenna according to claim 1, wherein: 3. The microstrip antenna according to claim 2, wherein the power feeding means is a microstrip line connected to the circular conductor plate of the power feeding patch. 4. The microstrip antenna according to claim 2, wherein the power feeding means is a slot line electromagnetically connected to the other surface of the circular conductor plate. 5. The microstrip antenna according to claim 4, wherein the feeding patch, the non-feeding patch, and the slot surrounding conductor of the slot line are formed on a dielectric film. 6. The microstrip antenna according to claim 5, wherein the slot line is covered with a ground plate via a dielectric material. 7. A power feeding patch for receiving a high frequency power and radiating a circularly polarized electromagnetic field from one surface of a circular conductor plate, and a power feeding means for supplying the high frequency power to the power feeding patch.
In a circularly polarized microstrip antenna comprising a parasitic patch that receives the circularly polarized electromagnetic field from the feeding patch on one surface and re-radiates the circularly polarized electromagnetic field from the other surface, the feeding patch is the circular A pair of pairs formed on the circumference of the shaped conductor plate at positions of approximately 45 ° either clockwise or counterclockwise with respect to the direction of the straight line connecting the feeding end of the high-frequency power and the center of the circular conductor plate. A concave portion and a pair of convex portions formed on a line that passes through the center of the antenna and is perpendicular to the symmetry line of the feeding patch connecting the pair of concave portions, and the parasitic patch is provided on one surface of the circular conductor plate. A pair of recesses formed in a pair of opposing apexes corresponding to the pair of recesses of the power feeding patch; A pair of When the circularly polarized electromagnetic field radiated by the feeding patch is a right circularly polarized electromagnetic field, there is a pair of convex portions formed in another pair of apexes facing each other corresponding to the convex portion. The parasitic patch symmetry axis connecting the pair of convex portions or concave portions of the shaped conductor plate is rotated counterclockwise with reference to the symmetry axis of the feeding patch connecting the pair of concave portions or convex portions of the feeding patch. When the circularly polarized electromagnetic field radiated by the patch is a left circularly polarized electromagnetic field, the parasitic patch symmetry axis connecting the pair of convex portions or concave portions of the rectangular conductor plate is the concave portion or convex portion of the feeding patch. A microstrip antenna for line polarization, which is rotated clockwise with respect to a symmetry axis of a feeding patch connecting a pair of parts. 8. The feeding means is a slot line electromagnetically connected to the other surface of the circular conductor plate, and the feeding patch, the parasitic patch and the slot surrounding conductor of the slot line are dielectric films. The microstrip antenna according to claim 7, wherein the microstrip antenna is formed on the top. 9. A power feeding patch for receiving a high frequency power and radiating a circularly polarized electromagnetic field from one surface of the first rectangular conductor plate, a power feeding means for feeding the high frequency power to the power feeding patch, and the power feeding. In a circularly polarized microstrip antenna including a parasitic patch that receives the circularly polarized electromagnetic field from a patch on one surface and re-radiates this circularly polarized electromagnetic field from the other surface, in the apex at which the feeding patches face each other It has either a pair of concave portions or a pair of convex portions formed in a pair, the parasitic patch is the first rectangular conductor plate, and the second rectangular conductor plate is a pair of apexes facing each other. Or a pair of concave portions formed on the same, the concave portion of the power feeding patch corresponds to the concave portion of the parasitic patch, or the convex portion of the power feeding patch is convex of the parasitic patch. Corresponding to department A microstrip antenna for circular polarization, which is characterized by 10. When the circularly polarized electromagnetic field radiated by the feeding patch is a right-handed circularly polarized electromagnetic field, a parasitic patch symmetry connecting the pair of the convex portion or the concave portion of the second rectangular conductor plate. The axis is rotated counterclockwise with reference to the symmetrical axis of the feeding patch connecting a pair of concave or convex portions of the parasitic patch, and the circularly polarized electromagnetic field radiated by the feeding patch is a left-handed circularly polarized electromagnetic field. When, the parasitic patch symmetry axis connecting the pair of convex portions or concave portions of the second rectangular conductor plate is clockwise with respect to the feeding patch symmetry axis connecting the pair of concave portions or convex portions of the power feeding patch. The microstrip antenna according to claim 9, wherein the microstrip antenna is rotated in the direction of the arrow. 11. The microstrip antenna according to claim 10, wherein the power feeding means is a microstrip line connected to the first rectangular conductor plate of the power feeding patch. 12. The microstrip antenna according to claim 10, wherein the power feeding means is a slot line electromagnetically connected to the other surface of the first rectangular conductor plate. 13. The microstrip antenna according to claim 12, wherein the feeding patch, the non-feeding patch, and the conductor around the slot of the slot line are formed on a dielectric film. 14. The slot line is covered with a ground plate via a dielectric material.
The described microstrip antenna. 15. A power feeding patch for receiving a high frequency power and radiating a circularly polarized electromagnetic field from one surface of a first rectangular conductor plate, a power feeding means for supplying the high frequency power to the power feeding patch, and In a circularly polarized micro-slip antenna including a parasitic patch that receives the circularly polarized electromagnetic field from a feeding patch on one surface and re-radiates the circularly polarized electromagnetic field from the other surface, the feeding patches are mutually It has a pair of concave portions formed in a pair of facing vertices and a pair of convex portions formed in another pair of apexes, and the parasitic patch faces one surface of the first rectangular conductor plate. A pair of recesses formed in a pair of apexes facing each other corresponding to the pair of recesses of the power feeding patch, and the power feeding patch. Corresponding to a pair of convex parts of A pair of convex portions formed on another pair of facing vertices, and when the circularly polarized electromagnetic field radiated by the feeding patch is a right-handed circularly polarized electromagnetic field, the second rectangular conductor plate The non-feed patch symmetry axis connecting the pair of convex portions or concave portions of is rotated counterclockwise with respect to the feed patch symmetry axis connecting the pair of concave portions or convex portions of the power feeding patch, and the radiation of the power feeding patch is emitted. When the polarization electromagnetic field is a left-handed circularly polarized electromagnetic field, the parasitic patch symmetry axis connecting the pair of convex portions or concave portions of the second rectangular conductor plate is the concave or convex portion of the feeding patch. A microstrip antenna for circularly polarized waves, which is characterized by being rotated clockwise with respect to a symmetry axis of a feeding patch connecting a pair. 16. The feeding means is a slot line electromagnetically connected to the other surface of the first rectangular conductor plate, and the feeding patch, the parasitic patch, and the slot surrounding conductor of the slot line, The microstrip antenna according to claim 15, wherein the microstrip antenna is formed on a dielectric film.