JPH08116211A - Plane antenna system - Google Patents

Abstract

PURPOSE: To realize an antenna in common use for reception of a polarized wave in which layers with thin profile are formed orthogonally by arranging microstrip lines whose feeding directions are orthogonal to both major sides of a 2nd dielectric board. CONSTITUTION: The antenna system is provided with a 1st ground conductor plate 1, a 1st dielectric board 2 provided adjacent the 1st ground plate 1, and a 3rd dielectric board 3 provided on the 1st dielectric board 2 and whose thickness (t) is thinner than that of the 1st dielectric board 2, and also with strip conductors 8, 9 being 1st and 2nd feed lines used to feed power to 1st and 2nd radiation conductors 4, 6. Then Then feeding points 10, 11 of the radiation conductors 4, 6 provided to 1st and 2nd major sides 5, 7 of the 2nd dielectric board 3 are located at positions deviated by an angle of 90 deg. thereby allowing the directions of currents flowing to the surface of the radiation conductors 4, 6 to be orthogonal to each other. Furthermore, plural slits with a prescribed width S are provided to the radiation conductors 4, 6 along the feeding direction with respect to the feeding points 10, 11 and the pattern is formed to be interdigital.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarized dual-purpose planar antenna device used for satellite communication and the like.

[0002]

2. Description of the Related Art Conventionally, there is a planar antenna device of this type shown in FIG. 15, for example. FIG. 15 shows 1992
FIG. 2 is a perspective view showing a dual-polarization planar antenna described in “Spring characteristics of dual-polarized triple-plate-fed planar antenna” published by the Institute of Electronics, Information and Communication Engineers Spring Meeting published here, here, a two-layer triplate-fed patch antenna. Are coupled via a slot and each patch is excited by an independent triplate line. Further, as a conventional method of feeding an array antenna, for example, 1981 1
Monthly IEEE TRANSACTION ON A
NTENNAS AND PROPAGATION, V
OL. A-29, NO. 1 "Microstrip A
In the "rray Technology", corporate feeding is described in which two radiating elements are paired to feed power in a tournament method. Fig. 16 is an explanatory diagram of a feeding method of an array antenna showing corporate feeding.

[0003]

For example, when polarization is shared by a single layer array antenna, it is necessary to feed power to each antenna element from two directions, and two types of feed lines must be connected. When two types of feed lines are formed on the same plane, they must be arranged so that the lines do not contact each other, and generally, a means for sequentially connecting the elements in series as shown in FIG. 16 is used. However, in such a series-type feeding method, since the phase of the feeding signal shifts each time it passes through each radiating element, the feeding signals with different phases are supplied to each radiating element, and the radiation of each radiating element is In the pattern, the polarization directions thereof are slightly deviated from each other, and the cross polarization components leak into each other, which makes it difficult to share the polarization. Further, in order to avoid such a problem, the antenna is made multi-layered as shown in FIG. 15, but it is not necessarily a practical solution for a planar antenna device which is desired to be thin.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to reduce the frequency characteristics of the radiation pattern and to make the polarization sharing possible with less leakage of cross polarization components. The purpose is to obtain a planar antenna device.

[0005]

A planar antenna device according to a first aspect of the present invention is a planar ground conductor plate, and a first dielectric plate provided adjacent to the ground conductor plate, A second dielectric plate laminated on the first dielectric plate and thinner than the thickness of the first dielectric plate, and a first dielectric plate provided on both main surfaces of the second dielectric plate, respectively. And a second radiation conductor plate and power feeding means for feeding power to the first and second radiation conductor plates respectively, and the power feeding directions of these power feeding means are made orthogonal to each other, and the first and second radiation conductor plates are provided. It excites polarized waves orthogonal to the radiation conductor plate.

A planar antenna device according to a second aspect of the present invention is a planar first ground conductor plate, and a first dielectric plate provided adjacent to the first ground conductor plate, A second dielectric plate provided on the first dielectric plate, and between the first dielectric plate and the second dielectric plate, the first and second dielectric plates being provided. A third dielectric plate having a thickness smaller than that of the body plate and conductor patterns having comb teeth on both main surfaces of the third dielectric plate are formed, and the comb teeth extend on both main surfaces. Radiation conductor plates arranged so that their directions are orthogonal to each other, a second ground conductor plate provided adjacent to the second dielectric plate, and the radiation conductor plate are fed to generate orthogonal polarized waves. And a power feeding means for exciting.

According to a third aspect of the present invention, the planar antenna device is such that the length of the comb teeth in the extending direction is half the wavelength of the feed signal fed by the feeding means.

According to a fourth aspect of the present invention, there is provided a planar antenna device comprising a first ground conductor plate having a planar shape, and a first dielectric plate provided adjacent to the first ground conductor plate. A second dielectric plate provided on the first dielectric plate, and between the first dielectric plate and the second dielectric plate, the first and second dielectric plates being provided. A third dielectric plate thinner than the thickness of the body plate, a radiation conductor plate having conductor patterns formed on both main surfaces of the third dielectric plate, and provided adjacent to the second dielectric plate. And a second ground conductor plate having an opening for exposing the conductor pattern of the radiation conductor plate to the outside, and a power feeding means for feeding power to the radiation conductor plate and exciting orthogonal polarized waves. .

According to a fifth aspect of the present invention, there is provided a planar antenna device comprising a first ground conductor plate having a planar shape, and a first dielectric plate provided adjacent to the first ground conductor plate. A second dielectric plate which is laminated on the first dielectric plate and is thinner than the thickness of the first dielectric plate; and a first power feeding means provided on the second dielectric plate, A slot is formed which is laminated on the first power feeding means via a third dielectric plate, is electromagnetically fed in a contactless manner by the first power feeding means, and excites a polarized wave along the power feeding direction. The second ground conductor plate, the fourth dielectric plate provided adjacent to the second ground conductor plate, and the fourth dielectric plate laminated on the fourth dielectric plate. A fifth dielectric plate thinner than the thickness of the plate, a second power feeding means provided on the fifth dielectric plate, and a sixth inductor on the second power feeding means. A third ground conductor plate provided via a body plate and the fifth dielectric plate are provided, and power is supplied by the second power supply means from a direction perpendicular to the power supply direction of the first power supply means. A radiation conductor plate for exciting a polarized wave in a direction orthogonal to the polarized wave excited by the slot is provided.

A planar antenna device according to a sixth aspect of the present invention is a planar ground conductor plate, a first dielectric plate provided adjacent to the ground conductor plate, and the first dielectric body. A second dielectric plate laminated on the plate, a radiating element array provided on both main surfaces of the second dielectric plate, and having a plurality of radiating elements arranged in a matrix, and each main surface In the column direction of the radiating element array, a column-direction feed line connecting adjacent radiating elements in the column direction, a row-direction feed line connecting the column-direction feeding lines adjacent to each other in the row direction, and a main power feeding to the row-direction feeding line. A feed line, and the feed points from the row-direction feed line to the column-direction feed line are set to have the same phase between adjacent radiating elements in the column direction.

According to a seventh aspect of the present invention, there is provided a planar antenna device including a ground conductor plate, a first dielectric plate provided adjacent to the ground conductor plate, and a first dielectric member. A second dielectric plate laminated on the plate; and a radiating element array in which a plurality of radiating elements are arranged on each of the two main surfaces of the second dielectric plate and arranged in a matrix. A plurality of row-direction feed lines that feed power to the radiating elements arranged in each row direction on the main surface of the column, column-direction feed lines that connect adjacent row-direction feed lines, and main feed that feeds the midpoint of the column-direction feed lines. A line, a plurality of column-direction feed lines that feed together radiating elements arranged in each column direction on the other main surface, and a main feed line that feeds the midpoint of adjacent column-direction feed lines. is there.

According to an eighth aspect of the present invention, there is provided a planar antenna device including a first ground conductor plate having a planar shape and a first dielectric plate provided adjacent to the first ground conductor plate. This first
And a radiating element array in which a plurality of radiating elements are arranged on the main surface of the dielectric plate in a matrix, and the radiating element array is stacked on the first dielectric plate, and is arranged in a matrix corresponding to the plurality of radiating elements. A second dielectric plate having a through hole formed therein and a second dielectric plate provided on the main surface of the second dielectric plate on the opposite side to the first ground conductor plate, and the through hole of the second dielectric plate is provided. A second ground conductor plate having a plurality of openings formed correspondingly and a radiating element adjacent to each other in the row direction of the radiating element array are connected to each other to form a pair of radiating elements. A column connecting the feed line, a second row-direction feed line that further connects a pair of radiating elements in the row direction to form a set of radiating elements, and the second row-direction feed line in the column direction Directional feed line and main feed line that feeds this column feed line It is intended.

According to a ninth aspect of the present invention, there is provided a planar antenna device in which the opening of the second ground conductor plate corresponding to a predetermined through hole provided in the second dielectric plate is closed. is there.

[0014]

In the planar antenna device according to the present invention, the first and second radiation conductor plates are provided on both main surfaces of the dielectric plate, and the first and second radiation conductor plates are respectively provided. Since power is fed and the feeding directions are made orthogonal to each other, leakage of cross-polarized components is small and polarized waves are shared.

In the planar antenna device according to the second aspect of the present invention, the feeding means is provided on both main surfaces of the third dielectric plate provided between the first ground conductor plate and the second ground conductor plate. Since the triplate line is provided on the radiating conductor plate, line loss of power feeding to the radiation conductor plate can be suppressed.

In the planar antenna device according to the third aspect of the invention, the pattern of the radiation conductors provided on both main surfaces of the dielectric plate is comb-shaped, and the length in the feeding direction is the feeding signal. Since it is set to be 1/2 wavelength, it is possible to accurately grasp the cross polarization components between the first and second radiation conductor plates provided on both main surfaces of the dielectric plate, and Leakage against waves is unlikely to occur.

In the planar antenna device according to the fourth aspect of the present invention, since the radiation conductors are excited by different powers in a non-contact manner by the power feeding means, unnecessary radiation from the power feeding means is suppressed.

According to the fifth aspect of the present invention, in the planar antenna device, the dielectric plate is laminated on the second ground conductor plate forming the slot antenna, and the radiation conductor and the second feeding means are provided. The radiating conductor functions as an antenna with the second ground conductor plate as the ground, and the coupling between the feed lines is suppressed.

In the planar antenna device according to the present invention as defined in claim 6, since the feeding points from the row-direction feed lines to the column-direction feed lines are set to be in phase between the radiating elements adjacent in the column direction, The feed line can be shortened, and the symmetry of the radiation pattern can be improved.

According to a seventh aspect of the present invention, there is provided a planar antenna device in which the lengths of the two divided lines are made equal to each other and the lengths of the two divided lines are changed. Since the feeding method 2 for feeding the radiating element in the same phase is arranged on the same plane, the space of the feeding line can be reduced,
Moreover, the frequency characteristics of the radiation pattern of each radiating element are small, and the orthogonality of polarized waves is good.

According to the eighth aspect of the present invention, in a planar antenna device, a dielectric plate and a ground conductor plate are provided on a plurality of radiation elements arranged in a matrix, and the dielectric plate and the ground conductor plate are provided. Since the matrix-shaped through holes and openings corresponding to the radiating elements are formed, line loss of power feeding to the radiating conductor is suppressed, and power feeding efficiency to each radiating element is improved.

In the planar antenna device according to the ninth aspect of the present invention, since the opening of the second ground conductor plate corresponding to the predetermined through hole provided in the dielectric plate is closed, radiation can be performed with a simple structure. The pattern has low side lobes, and the amplitude distribution is uniform.

[0023]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1 is a configuration diagram showing a planar antenna device according to an embodiment of the present invention, for example, a single patch antenna that is a part of an array antenna that excites a plurality of patch antennas on independent lines. 1A is a perspective view, FIG. 1B is a top view, and FIG. 1C is a sectional view taken along line AA in FIG. 1A to 1C, 1 is a first ground conductor plate, 2 is a first dielectric substrate provided adjacent to the first ground conductor plate, and 3 is a first dielectric body. It is a second dielectric substrate provided on the plate 2, and is set to a predetermined thickness t smaller than that of the first dielectric substrate 2. Further, 4 is a first radiation conductor provided on the first main surface 5 of the second dielectric substrate 3, and 6 is a second radiation conductor provided on the second main surface 7 of the second dielectric substrate 3. Radiation conductor of
A strip conductor 8 is provided on the first main surface 5 and is a first feed line that feeds the first radiation conductor, and 9 is provided on the second main surface 7 and feeds the second radiation conductor. The strip conductors 10 and 11 which are the second feeding lines are feeding points of the radiation conductors 4 and 6, respectively. The radiation conductor 4
And 6 are provided such that their feeding points 10 and 11 are displaced from each other by 90 °, and the current directions on the surfaces of the radiation conductors 4 and 6 are orthogonal to each other. Furthermore, the radiation conductor 4
A plurality of slits having a predetermined width s are provided on the electrodes 6 and 6 along the feeding direction with respect to the feeding points 10 and 11, and the pattern shape thereof is formed in a comb tooth shape. In such a configuration, the first microstrip antennas 12, 1, 2, 3, 8 are configured by the first microstrip antennas 12, 1, 2, 3, 8, and the second microstrip lines are configured by the first microstrip lines 13, 1, 2, 5, respectively. 2nd by strip antenna 14, 1, 2, 9
The microstrip lines 15 of are respectively configured.

Next, the shapes and dimensions of these microstrip antennas will be described. First, the radiation conductors 4 and 6 may have various shapes such as a square, a rectangle, and a circle. Generally, the polarized wave excited on the radiation conductor is the size of the radiation conductor and the feed signal. Since the frequency changes depending on the input wavelength, when it is desired to share polarized waves of different frequencies for transmission and reception such as satellite communication, it is desirable that the radiation conductor has a rectangular shape with the same input wavelength. In this way, two types of polarized waves having different frequencies can be obtained and used independently for transmission and reception. In the present invention, for simplicity of description, a square shape will be described.

Further, the dimensions of the radiation conductors 4 and 6, particularly the width N in the feeding direction with respect to the feeding points 10 and 11, are 1/2 of the wavelength: λ of the feeding signal fed to the feeding points 10 and 11.
It is necessary to set the length of each. That is,
The planar antenna device of the present invention is premised on obtaining a dual-polarized antenna, and in such a planar antenna device, polarized waves excited on the respective microstrip antennas do not interfere with each other and function as independent antennas. In this embodiment, the feeding points 10 and 11 are displaced 90 ° from each other so that the cross polarization components do not affect each other, and the polarizations are orthogonal to each other. However, strictly speaking, this is sufficient. First, what kind of mode the polarized wave is excited on this microstrip antenna becomes a big problem.

FIG. 2 shows the width N of the radiation conductors 4 and 6 of the patch antenna shown in FIG. 1 in the feeding direction as 1 / the input wavelength: λ.
FIG. 3 is an explanatory diagram showing a magnetic current distribution and an electromagnetic field distribution when a length of 2 is set and a power supply signal of λ is supplied to excite polarized waves on a microstrip antenna. The width N of the radiation conductors 4 and 6 in the feeding direction is set to 1 / wavelength of the feeding signal: λ
When the length is set to 2, the electromagnetic field distribution becomes as shown in FIG. 2, the cross polarization components of the polarized waves are small, and the polarized waves are orthogonal polarized waves having a small influence on each other. A mode having a magnetic current distribution and an electromagnetic field distribution as shown in FIG. 2 is a basic mode of TM ₁₀ mode, and when changing the input wavelength λ of the feeding signal or the shape of the radiation conductor, as shown in FIG. It is necessary to ensure that various fundamental modes are excited.

Next, the thickness t of the second dielectric substrate 3 provided with the radiation conductors 4 and 6 will be described. FIG. 3 shows cross polarization components [d] between the respective microstrip antennas when the fundamental mode as shown in FIG. 2, TM ₁₀ mode polarization is excited in the patch antenna shown in FIG.
It is a characteristic view showing B]. In FIG. 3, the horizontal axis represents the ratio of the input wavelength λ of the feed signal to the thickness t of the second dielectric substrate 3, and the vertical axis represents the cross polarization component with respect to the change in the ratio. It can be said that the smaller the component, the less coupling between the antennas. Therefore, the second dielectric substrate 3
When the input wavelength of the feed signal: λ is constant,
It may be set so that the cross polarization component is equal to or less than a predetermined value. For example, in the case of satellite communication, the frequency of the signal to be handled is as high as 1 to 50 [GHz], and if it is set to about -20 [dB], there will be no influence on the excitation of mutual polarized waves during transmission and reception, and signal deterioration will occur. It is possible to obtain a difficult and thin flat antenna device. Further, although polarization can be shared even in the higher-order mode instead of the fundamental mode, in the case of the higher-order mode, the characteristic of the cross-polarized component shown in FIG. In order to reduce the wave component or less, the plate thickness t becomes thicker than in the case of the basic mode,
The basic mode is still desirable in a planar antenna device that is required to be thin.

Next, the operation will be described. In the present embodiment, the microstrip antenna 12 and the microstrip antenna 14 have the ground conductor plate 1 in common and the feeding directions are orthogonal to each other, so that the coupling between the antennas is small, and they operate as independent antennas. Then
It becomes an antenna with excellent cross polarization characteristics. Therefore, one polarized wave is transmitted / received by the first microstrip antenna 12, and the other polarized wave orthogonal thereto is transmitted / received by the second microstrip antenna 14.
Polarization can be shared by two antennas.

Further, in the present embodiment, the pattern shapes of the radiation conductors 4 and 6 are comb-shaped, and each of them is the second.
The dielectric substrate 3 is provided on both main surfaces of the second dielectric substrate so as to face each other with a 90 ° offset therebetween. This is between the microstrip antennas 12 and 14 described above. Of course, the purpose is to suppress the relative amount of electrical coupling of the radiation conductors. However, from the viewpoints other than this, there is an advantage in that the pattern shape of the radiation conductor is comb-shaped. That is, the thickness t of the second dielectric substrate 3 is obtained by calculating the cross polarization component between the first radiation conductor 4 and the second radiation conductor 6 in advance as shown in FIG. , It is necessary to set an appropriate plate thickness from this characteristic, but in general, when calculating the coupling amount between microstrip antennas, considering surface contact, due to various factors,
A large error occurs between the actually created one and the one obtained by calculation, which is extremely difficult in reality. Therefore, if the pattern shape of the radiation conductors is comb-shaped like in this embodiment, it is considered that the radiation conductors are electrically in point contact with each other.
For example, it is possible to obtain the coupling amount between the radiation conductors 4 and 6 accurately with an existing technique such as the Wiregrid method, and to obtain a very practical thin planar antenna device. The closer the contact portion is to the point, the higher the accuracy is obtained.

Further, the coupling amount in the case of surface contact is predicted from the supply characteristic between the radiation conductors obtained by the Wiregrid model, or the coupling amount in the case of surface contact is obtained by another method. If the characteristics are accurately obtained, it is possible to obtain a planar antenna device using a mere square or rectangular radiating conductor. FIG. 4 is a configuration diagram of a patch antenna in which a radiation conductor having a simple square pattern is provided on both main surfaces of the second dielectric substrate 3, and FIGS. 4 (a), 4 (b), and FIG. 4C shows a perspective view, a top view, and an AA cross-sectional view, respectively. In FIG.
1b is a first radiation conductor provided on the first major surface 5 of the second dielectric 3, and 17 is a second radiation conductor provided on the second major surface 7.
Radiation conductors 16 and 17 of the second
Are in surface contact with each other via the dielectric substrate 3. In addition, in FIG. 4, the first microstrip antennas 18, 1, 2, and 17 constitute the second microstrip antenna 19, respectively.

Next, the operation of the patch antenna shown in FIG. 4 will be described. First microstrip antenna 18
Since the second microstrip antenna 19 and the second microstrip antenna 19 have the first ground conductor plate 1 in common and have feeding directions orthogonal to each other, orthogonal polarized waves can be generated. Generally, the fundamental mode of a rectangular microstrip antenna is T
In the M10 mode, the patch antenna of FIG.
The polarized wave of the electromagnetic field distribution as shown in is excited.

Example 2. Next, a case will be described in which a plurality of patch antennas as described above are arranged in a matrix to form an array antenna and power is supplied to these plurality of patch antennas. FIG. 5 is a configuration diagram showing a feeding means for an array antenna in which a plurality of patch antennas are arranged in a matrix. In FIG. 5, 20 is a patch antenna and 21 is an end portion of each radiation conductor between the two patch antennas. Connected first feed lines, 22 are in-phase feed points fed from the first feed line 21, 23 is a reverse-phase feed point provided at a position 180 degrees symmetrical with the in-phase feed point 22, and 24 is a feed position Two feeding points 22 with different 180 degrees
And 23 to feed the same phase, the first feed line 2
The second feed line is connected to a predetermined position of 2, and the feed lines of other patch antennas are also connected in such a positional relationship. Reference numeral 25 is a main power feeding line fed from a power feeding unit (not shown).

Next, the operation will be described. In order to feed all the radiating conductors in the same phase, two patch antennas are paired and one patch antenna feeds from a normal in-phase feeding point 22, and the other patch antenna feeds a point 23 of 180 degrees symmetry of one patch antenna. Power is supplied from. Symmetric point 2
When the power is supplied from 3, the microstrip antenna is supplied with a 180-phase shift, so this is compensated so as to be in phase with the length ratio of the first line 21. By feeding power from the opposite phase, the line arrangement becomes a compact antenna, and the feed line arrangement of the dual polarization antenna becomes easy. Although the present embodiment has described the case of only one surface, when the array antenna is configured by the patch antenna as shown in the first embodiment, the first and second main parts of the second dielectric substrate 3 are formed. It is necessary to place them on the surface so that they are offset from each other by 90 °.

Example 3. Next, another feeding means for the array antenna will be described. FIG. 6 is a configuration diagram showing another feeding means for the array antenna of the present invention.
In FIG. 6, reference numeral 26 is a first power feeding method in which the lengths of the two-divided lines are made equal, and 27 is a second power feeding method in which the lengths of the two-divided lines are changed and power is fed to the radiating element in the same phase.

Next, the operation will be described. Generally, when an electric wave is radiated as an array antenna perpendicularly to the plane on which the antennas are arranged, it is necessary to feed all the radiating conductors in the same phase. In FIG. 6, by changing the lengths of the first and second feeding systems 26 in which the lengths of the two-divided lines are made equal,
For example, by arranging the second feeding method 27 for feeding the radiating element in the same phase by changing the length of the line by an amount corresponding to the phase of one wavelength, a compact feeding circuit can be configured and Multilayering can be facilitated.
Thereby, a dual polarization antenna can be obtained.

Example 4. In an array antenna composed of such a plurality of patch antennas, the amplitude distribution of the antenna device as a whole varies, and a uniform amplitude distribution may not be obtained. FIG. 7 shows an embodiment for making such an amplitude distribution uniform. In FIG. 7, 28 is a radiating conductor forming a patch antenna, 29 is a feeding line for feeding each radiating conductor 28,
Reference numeral 30 denotes a dielectric substrate provided on the radiation conductor 28 and the feeding line 29, 31 denotes a second ground conductor plate provided on the main surface of the dielectric substrate 30, and 32 denotes a dielectric substrate corresponding to the radiation conductor 28. An aperture formed of a through hole provided in 30 and an opening formed in the second ground conductor plate 31 corresponding to the through hole, and 33 is an aperture that shields the through hole and the opening 32.

Next, the operation will be described. If the shielded aperture 33 is provided as shown in FIG. 7, the amplitude distribution of the entire array antenna can be weighted. For example, if the shielded aperture 33 is provided at a predetermined position, a uniform amplitude distribution can be obtained. . As described above, in the array antenna, the amplitude distribution varies because side lobes are generated in the polarized waves excited by the radiating conductors 28, and each side lobe is low, but as shown in FIG. This is because the side lobes are accumulated by arranging them and forming an array antenna. In contrast,
It is conceivable to suppress each side lobe of the radiating conductor to suppress the variation in the overall amplitude distribution, but this is very troublesome and it is difficult to obtain uniformity as a whole. With such a configuration, it is possible to efficiently suppress variations in the amplitude distribution of the entire array antenna.

Embodiment 5 FIG. Next, another embodiment relating to the planar antenna device of the present invention will be described. 8A and 8B are configuration diagrams showing a single patch antenna of an array antenna configured by arranging a plurality of patch antennas in a matrix form. FIG. 8A is a perspective view and FIG. -A sectional drawing is each shown. Note that in FIG. 8A, the dielectric substrate adjacent to the first and second ground conductor plates is omitted for easy understanding of the positional relationship of the radiation conductors. FIG.
34 is a third dielectric substrate laminated on the second dielectric substrate 3 of the patch antenna shown in FIG. 1 of the first embodiment, and 35 is provided adjacent to the third dielectric substrate 34. A second ground conductor plate 36 is an aperture which is an opening provided in the second ground conductor plate 35. This aperture 3
6 is the first and the second as shown in FIGS.
The feed lines 8 and 9 are provided on the second ground conductor 35 so as to form a triplate line. In addition, 4 is a 1st radiation conductor which has a slit of the same direction as a polarization direction, and comprises the 1st microstrip antenna from 1,2,3. Reference numeral 6 is a second radiating conductor having a slit in the same direction as the polarization direction.
Of the microstrip antenna.

Next, the operation will be described. The first radiation conductor 4 is composed of the first ground conductor 1 and the dielectric substrate that sandwiches the first ground conductor 1 and the first ground conductor 1.
Of the strip conductor 8 in the same plane as the radiating conductor 4 and the first ground conductor plate 1 and the second ground conductor plate 35 which are formed of a dielectric substrate. It composes the track.
A microstrip antenna is excited by this triplate-type strip line and emits linearly polarized radio waves.
The second microstrip antenna having a polarization orthogonal to the first microstrip antenna is composed of the first ground conductor plate 1 and the second radiation conductor 6. Similarly, the power feeding circuit forms a triplate-type strip line by the strip conductor 9, which is in the same plane as the radiation conductor 6, the first ground conductor 1, and the second ground conductor 35. Therefore, the triplate line suppresses unnecessary radiation from the feed line and one polarized wave is transmitted / received by the first microstrip antenna, and the other polarized wave orthogonal thereto is transmitted / received by the second microstrip antenna. Polarization can be shared by one antenna.

Embodiment 6 FIG. FIG. 9 is a configuration diagram of a patch antenna of a planar antenna device showing another embodiment of the present invention. In FIG. 9, 37 is a feed line provided on the second main surface 7 of the second dielectric substrate 3 for electromagnetically exciting the first radiation conductor 16 in a non-contact manner. This feeder line 3
Numeral 7 extends to almost the central portion of the first radiating conductor 16 and the first ground conductor plate 1 and the second ground conductor plate 35 form the first ground conductor plate 1 through the dielectric substrates 2 and 34, respectively. A triplate line is configured similarly to the power feed line 8. According to the present embodiment, the first radiation conductor 16 is electromagnetically fed by the feeding line 37 in a non-contact manner to excite one radiation conductor in two directions and share polarized waves. It also has the effect of suppressing unnecessary radiation from the power supply line.

Example 7. FIG. 10 is a configuration diagram of a patch antenna of a planar antenna device showing another embodiment of the present invention. In FIG. 10, 38 is a radiation conductor provided on the same plane as the second ground conductor plate 35. Next, the operation will be described. In this embodiment, the radiation conductors 38 are provided in the same plane as the second ground conductor plate 35 on both main surface tables 5 and 7 of the second dielectric substrate 3 according to the same principle as in the sixth embodiment. Since the first and second feed lines 39 and 40 are electromagnetically excited in a non-contact manner and radiate two polarized waves that are orthogonal to each other, a dual-polarization antenna with less radiation from the feed lines can be obtained.

Example 8. FIG. 11 is a block diagram of a patch antenna of a planar antenna device showing another embodiment of the present invention. In FIG. 11, 41 is a strip conductor and 42 is a third conductor.
Slot formed in the second ground conductor plate 35 provided adjacent to the dielectric substrate 34, 43 to 45 are dielectric substrates laminated on the second ground conductor plate 35, and 46 is a dielectric substrate. A third ground conductor plate, which is provided adjacent to, is a through hole penetrating the dielectric substrate 44. Next, the operation will be described. One polarization is slot 4 from strip conductor 41
2 is electromagnetically fed and excited in a contactless manner, and a polarized wave parallel to the strip line is radiated from the slot 42. On the other hand, for the other polarized wave, by exciting the radiation conductor 4 with the strip line 8, it is possible to obtain a polarized wave common antenna in which the coupling between the feed lines is small and the isolation between the polarized waves is taken.

Embodiment 9 FIG. FIG. 12 is a configuration diagram of a patch antenna of a planar antenna device showing another embodiment of the present invention. In FIG. 12, reference numeral 48 is a printed dipole that is electromagnetically excited by a strip line 49 in a non-contact manner.
Next, the operation will be described. According to the same principle as in Example 8,
One polarization is slot 4 from the first strip conductor 41.
2 is electromagnetically fed and excited in a contactless manner, and a polarized wave parallel to the strip line 41 is radiated from the slot 42. Meanwhile, another one
The two polarized waves are electromagnetically excited by the printed dipole 48 from the strip line 49, so that a polarized wave common antenna in which the coupling between the feed lines is small and the polarized waves are isolated from each other can be obtained.

Example 10. FIG. 13 is a configuration diagram of a patch antenna of a planar antenna device showing another embodiment of the present invention. In FIG. 13, reference numeral 50 denotes a radiating conductor formed so that the strip conductor 51 is connected at its central portion.
The strip conductor 51 is drawn to the center of the radiation conductor 50 by the slit 52 of the book, and the feeding point 53 is provided at the center. According to the present embodiment, it is possible to directly excite the radiation conductor 50 by the strip conductor 51, and at this time, the slit 52 parallel to the strip conductor 51 lowers the input impedance of the microstrip antennas 1, 2, 3, 50, thereby achieving matching. An easy-to-use dual polarization antenna can be obtained. That is, when the feeding point of the radiation conductor 50 is provided not at the central portion but at the end portion, the feeding signal is reflected and the input impedance becomes high. In general, the amount of reflection from the radiation conductor is the smallest at the central portion, and becomes larger as the distance from the end portion increases. Matching is easy if the impedance is low, and it is desirable to provide the feeding point near the center.

Example 11. FIG. 14 is a configuration diagram of a patch antenna of a planar antenna device showing another embodiment of the present invention. In FIG. 14, 12c is a slit orthogonal to the radiation conductor. Reference numeral 54 denotes a radiation conductor that is folded short, and has a slit 55 that is parallel to the feeding direction.
According to the present embodiment, on the same principle as that of the tenth embodiment, the slot 42 is electromagnetically fed and excited by the strip conductor 54 in a non-contact manner, and the polarized wave parallel to the strip line 54 is radiated from the slot 42. It is possible to obtain a dual-polarization antenna that is compactly assembled.

[0046]

According to the planar antenna device of claim 1,
Since the microstrip antennas orthogonal to each other in the feeding direction are arranged on both main surfaces of the second dielectric substrate, there is an effect that an antenna for dual polarization can be obtained with a thin layer structure.

According to the planar antenna device of the second aspect, by providing the second ground conductor plate in which the through hole penetrating the second dielectric substrate is provided on the second dielectric substrate, it is possible to reduce the thickness. An effect is obtained in which a dual-polarized antenna that has a layered structure and suppresses unnecessary radiation from the line is obtained.

According to the planar antenna device of the third aspect, since the pattern of the radiation conductor is comb-shaped and the length in the feeding direction is 1/2 of the input wavelength of the feeding signal: λ, a thin layer structure is provided. The effect of obtaining a dual-polarization antenna with good cross polarization characteristics is obtained.

According to the flat antenna device of claim 4, 1
Since two radiating conductors are shared and one side is electromagnetically excited, an effect is obtained that has a simple configuration and that can be used for polarized waves that suppresses unnecessary radiation from a thin line.

According to the plane antenna device of the fifth aspect, the first radiating element is electromagnetically fed in a non-contact manner, and the second radiating element is fed directly. It is possible to obtain an antenna that is small in size and has polarization isolation with orthogonal polarization isolation.

According to the planar antenna device of the sixth aspect, at least one pair of radiating conductors arranged adjacent to each other is provided,
The power supply positions to the paired radiating elements are symmetrically arranged about 180 °, and the power supply phase is set to the same phase by changing the length of the line, and the microstrip antenna is fed in the same phase. By arranging these pairs on the same plane, it is possible to suppress unnecessary parallel plate modes or higher-order modes, and it is possible to obtain a dual-polarization antenna having a radiation pattern with good symmetry.

According to the planar antenna device of claim 7, 2
The same plane is used for the first feeding method in which the lengths of the distributed lines are made equal to feed the radiating element in the same phase and the second feeding method in which the length of the divided lines is changed and the radiating element is fed in the same phase. By arranging the antenna in a space, the space for the feed line can be reduced, and an effect can be obtained in which a dual-polarization antenna having a radiation pattern with a small frequency characteristic is obtained.

According to the planar antenna device of the eighth aspect, since the feeding means for each patch antenna constituting the array antenna constitutes an independent triplate line, unnecessary radiation from the feeding means is suppressed, and As a whole, it is possible to obtain a dual-polarization antenna that can significantly reduce line loss.

According to the planar antenna device of the ninth aspect, the second ground conductor plate on the upper part of the radiating element is provided with a hole substantially above the radiating element and a holeless hole. It is possible to obtain a dual polarization antenna with a simple structure and a low side lobe.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a pair of patch antennas of a planar antenna device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating a pair of patch antennas shown in FIG.
It is a magnetic current and electric field distribution map when a mode is excited.

FIG. 3 is a cross polarization characteristic diagram of the pair of patch antennas shown in FIG.

FIG. 4 is a configuration diagram showing a pair of patch antennas of a planar antenna device according to another embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a power feeding system of the planar antenna device according to another embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a power feeding system of a planar antenna device according to another embodiment of the present invention.

FIG. 7 is a configuration diagram showing an array antenna according to another embodiment of the present invention.

FIG. 8 is a configuration diagram showing a pair of patch antennas of a planar antenna device according to another embodiment of the present invention.

FIG. 9 is a configuration diagram showing a pair of patch antennas of a planar antenna device according to another embodiment of the present invention.

FIG. 10 is a configuration diagram showing a pair of patch antennas of a planar antenna device according to another embodiment of the present invention.

FIG. 11 is a perspective view showing a pair of patch antennas of a planar antenna device according to another embodiment of the present invention.

FIG. 12 is a perspective view showing a pair of patch antennas of a planar antenna device according to another embodiment of the present invention.

FIG. 13 is a perspective view showing a pair of patch antennas of a planar antenna device according to another embodiment of the present invention.

FIG. 14 is a perspective view showing a pair of patch antennas of a planar antenna device according to another embodiment of the present invention.

FIG. 15 is a perspective view showing an array antenna which is a conventional planar antenna device.

FIG. 16 is an explanatory diagram showing a power feeding system of a conventional planar antenna device.

[Explanation of symbols]

1 first ground conductor plate, 2 first dielectric substrate, 3 second
Dielectric substrate, 4 first radiation conductor, 5 first major surface, 6 second radiation conductor, 7 second major surface, 8 first strip conductor, 9 second strip conductor, 10 first Feeding point, 11 second feeding point, 12 first microstrip antenna, 13 first microstrip line, 14 second microstrip antenna, 1
5 2nd microstrip line, 20 patch antenna, 21 1st feed line, 22 common-mode feed point, 23
Anti-phase feeding point, 24 Second feeding line, 25 Main feeding line, 30 Dielectric substrate, 31 Second ground conductor plate, 32
Aperture, 33 shielded aperture.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yonehiko Sunahara 5-1-1 Ofuna, Kamakura-shi Electronic Systems Research Center, Mitsubishi Electric Corporation

Claims (9)

[Claims] 1. A planar ground conductor plate, a first dielectric plate provided adjacent to the ground conductor plate, and a first dielectric plate laminated on the first dielectric plate to form the first dielectric plate. A second dielectric plate thinner than the thickness of the plate, first and second radiation conductor plates respectively provided on both main surfaces of the second dielectric plate, and first and second radiation plates of these. A planar antenna device comprising: power feeding means for exciting orthogonally polarized waves by feeding power to the conductor plates and making their power feeding directions orthogonal to each other. 2. A planar first ground conductor plate, a first dielectric plate provided adjacent to the first ground conductor plate, and a first dielectric plate provided on the first dielectric plate. A second dielectric plate, a third dielectric plate provided between the first dielectric plate and the second dielectric plate, the third dielectric plate being thinner than the first and second dielectric plates.
And a conductor pattern having comb teeth on both main surfaces of the third dielectric plate, and the conductor patterns are arranged so that the extending directions of the comb teeth on both main surfaces are orthogonal to each other. A radiation conductor plate, a second ground conductor plate provided adjacent to the second dielectric plate, and a feeding means for feeding power to the radiation conductor plate and exciting orthogonal polarized waves. A planar antenna device. 3. The planar antenna device according to claim 2, wherein the length of the comb tooth-shaped piece in the extending direction is ½ wavelength of a feed signal fed by the feeding means. 4. A planar first ground conductor plate, a first dielectric plate provided adjacent to the first ground conductor plate, and a first dielectric plate provided on the first dielectric plate. A second dielectric plate, a third dielectric plate provided between the first dielectric plate and the second dielectric plate, the third dielectric plate being thinner than the first and second dielectric plates.
Dielectric plate, a radiation conductor plate having conductor patterns formed on both main surfaces of the third dielectric plate, and a conductor pattern of the radiation conductor plate provided adjacent to the second dielectric plate. A planar antenna device, comprising: a second ground conductor plate having an opening for exposing the antenna to the outside; and power feeding means for feeding power to the radiation conductor plate to excite orthogonal polarized waves. 5. A planar first ground conductor plate, a first dielectric plate provided adjacent to the first ground conductor plate, and laminated on the first dielectric plate, A second dielectric plate that is thinner than the thickness of the first dielectric plate, a first power supply means provided on the second dielectric plate, and a third dielectric plate on the first power supply means. A second ground conductor plate, which is laminated via a body plate, is electromagnetically fed with power by the first power feeding means in a contactless manner, and has a slot for exciting polarized waves along the power feeding direction; A fourth dielectric plate provided adjacent to the second ground conductor plate, and laminated on the fourth dielectric plate to form the fourth dielectric plate.
A fifth dielectric plate thinner than the thickness of the second dielectric plate, a second power supply means provided on the fifth dielectric plate, and a second power supply means.
A third dielectric provided on the power feeding means of the second dielectric plate through a sixth dielectric plate.
And a polarized wave which is provided on the fifth dielectric plate, is fed by the second feeding means from a direction perpendicular to the feeding direction of the first feeding means, and is excited by the slot. A planar antenna device comprising: a radiation conductor that excites polarized waves in orthogonal directions. 6. A planar ground conductor plate, a first dielectric plate provided adjacent to the ground conductor plate, and a second dielectric plate laminated on the first dielectric plate. And a radiating element array provided on both main surfaces of the second dielectric plate and having a plurality of radiating elements arranged in a matrix, and adjacent to each other on each main surface in the column direction of the radiating element array. The row-direction power supply line includes a column-direction power supply line that connects the radiating elements, a row-direction power supply line that connects the column-direction power supply lines adjacent to each other in the row direction, and a main power-supply line that supplies power to the row-direction power supply line. The planar antenna device is characterized in that the feeding points from the column feeding line to the column feeding line are set to have the same phase between adjacent radiating elements in the column direction. 7. A planar ground conductor plate, a first dielectric plate provided adjacent to the ground conductor plate, and a second dielectric plate laminated on the first dielectric plate. And a radiating element array having a plurality of radiating elements arranged in a matrix on both main surfaces of the second dielectric plate, and a radiating element arranged in each row direction on one main surface. A plurality of row-direction feed lines that feed power, a column-direction feed line that connects adjacent row-direction feed lines, a main feed line that feeds the midpoint of the column-direction feed line, and the other main surface that is arranged in each column direction. A planar antenna device comprising: a plurality of column-direction feed lines that feed the radiation elements together; and a main feed line that feeds a midpoint of adjacent column-direction feed lines. 8. A planar first ground conductor plate, a first dielectric plate provided adjacent to the first ground conductor plate, and a plurality of main dielectric plates on a main surface of the first dielectric plate. A radiating element array in which a number of radiating elements are arranged in a matrix and a second radiating element laminated on the first dielectric plate and having through holes formed in a matrix corresponding to the plurality of radiating elements. A dielectric plate,
A second dielectric plate provided on the main surface of the second dielectric plate opposite to the first ground conductor plate and having a plurality of openings formed corresponding to the through holes of the second dielectric plate; The second ground conductor plate, the first row-direction feed line for connecting the adjacent radiating elements in the row direction of the radiating element array to each other to form a pair of radiating elements, and the pair of radiating elements in the row direction. A second row-direction power supply line that is connected to form a set of radiating elements, a column-direction power supply line that connects the second row-direction power supply line in the column direction, and a main power supply that supplies power to the column-direction power supply line. A planar antenna device comprising a feed line. 9. The planar antenna according to claim 7, wherein an opening portion of the second ground conductor plate corresponding to a predetermined through hole provided in the second dielectric plate is closed. apparatus.