JP2005311524A - Dielectric resonator antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small dielectric resonator antenna having a wide band. <P>SOLUTION: A first dielectric plate 2 having a disk-like hole 20 is provided on a grounding plate 1 having a hole 10, and a columnar dielectric resonator 3 having a columnar cavity 30 is provided thereon. The external surface and internal surface (side surfaces of the cavity 30) of the dielectric resonator 3 are the same in center axis. Since the hole 20 of the first dielectric plate 2 and the cavity 30 of the dielectric resonator 3 are the same in dimension of the bottom surface and one columnar space is formed by these, a conductor mass 4 is filled in the space. Also, a feeding probe 6 consisting of a linear or narrow strip-like conductor is provided parallel to the center axis on the external side surface of the dielectric resonator 3, and a center conductor 51 of a coaxial cable 5 is connected thereto. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a resonator antenna using a dielectric having broadband characteristics.

A configuration of a dielectric resonator antenna 900 according to the prior art is shown in FIG. A cylindrical dielectric resonator 3 having a cylindrical cavity 30 is formed on the ground plate 1, and a feed probe comprising a linear or thin strip conductor parallel to the central axis of the dielectric resonator 3 on the outer periphery thereof. 6 is provided and is fed by the coaxial cable 5. In this technique, by appropriately setting the size of the outer side surface and inner side surface (side surface of the cavity 30) of the dielectric resonator 3, it resonates in the TM _01δ mode at a predetermined resonance frequency, and is equivalent to a monopole antenna. Operates as a directional antenna. Therefore, the TM _01δ mode of the dielectric resonator antenna 900 is referred to as a monopole mode.

The dielectric resonator antenna 900 of FIG. 11 has a problem that the length (height) from the ground plate is shorter (lower) than the monoball antenna, but the volume is large. In order to reduce the size, a dielectric resonator antenna 910 as shown in FIG. 12 has been proposed. A dielectric resonator antenna 910 in FIG. 12 is obtained by filling the cavity portion 30 of the dielectric resonator 3 of the dielectric resonator antenna 900 in FIG. The dielectric resonator antenna 910 shown in FIG. 12 has a TM _01δ that operates in a monopole mode with _respect to the dielectric resonator antenna 900 shown in FIG. 11 by filling the cavity 30 of the dielectric resonator 3 with the conductor block 4. It is possible to reduce the resonance frequency of the mode. Therefore, when operating at the same frequency, the antenna size is reduced. The details of the dielectric resonator antenna 900 in FIG. 11 are given in Patent Document 1, and the details of the dielectric resonator antenna 910 in FIG.
WO 01/31746 A1 RK Mongia, “Small electric monopole mode dielectric resonator antenna,” Electron. Lett., 1996, vol. 32, No. 11, pp. 947-949

In the dielectric resonator antenna 900 shown in FIG. 11 as in Patent Document 1, the size (mainly volume) at the time of resonance in the TM _01δ mode is physically large, and is used for in-vehicle use. Then there was a problem in practical use. In the dielectric resonator antenna 900 shown in FIG. 12 as in Non-Patent Document 1, although the antenna size can be reduced, the resonance bandwidth decreases. For example, depending on the application such as a car phone or a mobile phone, There was a problem of insufficient bandwidth.

  The present invention has been made to solve these problems, and an object of the present invention is to provide a dielectric resonator antenna having a small size and a wide band that can be used in a vehicle.

  According to a first aspect of the present invention, there is provided a first dielectric comprising a ground plate made of a conductor and a first dielectric having a relative dielectric constant of about 2 or less and disposed on a surface of the ground plate. A dielectric resonator comprising a body plate and a columnar second dielectric having a relative permittivity of approximately 10 to approximately 100 and having a columnar cavity portion disposed vertically on the dielectric plate along a central axis thereof; , One end of which is short-circuited to the ground plate through the hole of the first dielectric plate, and a conductor block provided so as to fill at least the columnar cavity of the dielectric resonator, and a power supply means for supplying power to the dielectric resonator And a dielectric resonator antenna. According to a second aspect of the present invention, in the dielectric resonator antenna according to the first aspect, the first dielectric plate is air or other gas or air gap. According to the third aspect of the present invention, the power supply to the dielectric resonator is performed by a conductor coupled linearly in parallel with the central axis of the columnar dielectric resonator on the outer peripheral side surface of the dielectric resonator. It is characterized by.

  According to a fourth aspect of the present invention, there is provided a second dielectric plate comprising a third dielectric body disposed on the back surface of the ground plate and having a slot at the lower portion of the dielectric resonator, and the second dielectric plate. A conductor line that forms a strip line in combination with a ground plate provided on the surface, and the power supply to the dielectric resonator is due to electromagnetic coupling through the slot from the strip line To do. According to a fifth aspect of the present invention, in the dielectric resonator antenna according to the fourth aspect, the slot is formed in an annular shape. According to a sixth aspect of the present invention, there is provided the dielectric resonator antenna according to the fourth or fifth aspect, wherein the means is disposed at a lower portion of the dielectric resonator, has a ring shape, and is formed of the second dielectric. A fourth dielectric having a relative permittivity equal to or greater than the relative permittivity, wherein the feed to the dielectric resonator is electromagnetically coupled through the slot from the stripline and the fourth dielectric And the slot is located below the fourth dielectric.

The means described in claim 7 is characterized in that the dielectric resonator has a cylindrical shape having a cylindrical cavity portion, and is designed to have a resonance mode of TM _01δ with _respect to a desired frequency.

  The resonance of the dielectric resonator antenna is determined by a loop formed by a magnetic field along a columnar shape having a hollow portion of a dielectric resonator composed of a second dielectric having a high relative dielectric constant. . Filling the cavity of the dielectric resonator with the conductor mass increases the circumference of the loop, which causes a decrease in the resonance frequency. Further, by inserting the first dielectric plate having a low relative dielectric constant between the dielectric resonator and the ground plate, the resonance Q value is lowered, and as a result, the band is widened. This means that the resonance frequency is greatly reduced as compared with a conventional monopole mode dielectric resonator antenna that resonates at approximately the same size (volume). As a result, the size can be greatly reduced compared to a monopole mode dielectric resonator antenna that resonates at the same frequency. Further, narrowing the bandwidth has become a problem simply by filling the conductor in the center of the dielectric resonator. However, according to the present invention, both downsizing and widening of the bandwidth can be achieved.

  Hereinafter, specific examples of the configuration of the present invention and simulation results will be described with reference to the drawings. In addition, this invention is not limited to the Example shown below. In addition, it is assumed that the dielectric plate has a hole and the conductor block is filled therewith. However, if the dielectric plate is air or other gas or a simple gap, the hole is substantially Naturally, there is only a conductor block having the size of the assumed hole.

  FIG. 1 shows a configuration of a dielectric resonator antenna 100 according to a first specific example of the present invention. FIG. A is a perspective view showing the configuration of the dielectric resonator antenna 100, FIG. B is a cross-sectional view showing the configuration of the dielectric resonator antenna 100. FIG. A first dielectric plate 2 having a disk-shaped hole 20 is provided on a ground plate 1 having a hole 10, and a columnar dielectric resonator 3 having a columnar cavity 30 is provided thereon. Provide. The center axis of the outer side surface 31 and the inner side surface 30 (side surface of the hollow portion 30) of the cylindrical dielectric resonator 3 coincides. The disk-shaped hole 20 of the first dielectric plate 2 and the columnar cavity 30 of the dielectric resonator 3 have the same diameter at the bottom, thereby forming one columnar space. . The conductor lump 4 is filled into the disk-shaped hole 20 of the first dielectric plate 2 and the columnar cavity 30 of the dielectric resonator 3. A feeding probe 6 made of a linear or thin strip conductor is provided on the outer surface of the cylindrical dielectric resonator 3 in parallel to the central axis, and a central conductor 51 of the coaxial cable 5 is connected thereto. The outer conductor 52 of the coaxial cable 5 is connected to the ground plate 1, and the insulator sheath 53 of the coaxial cable 5 fills the hole 10 of the ground plate 1 so that the central conductor 51 does not contact the ground plate 1.

The simulation results of the dielectric resonator antenna 100 shown in FIG. 1 are shown in FIGS. The simulation conditions were as follows. The first dielectric plate 2 has a relative dielectric constant ε _r2 of 1.0 and a thickness of 2.0 mm, and the dielectric resonator 3 has a relative dielectric constant ε _r3 of 21, a height of 15 mm, an outer diameter of 47 mm, an inner diameter ( The outer diameter of the cavity 30) was 14 mm. The relative dielectric constant ε _r2 of 1.0 is assumed to be a vacuum (gap) as the first dielectric plate.

For the dielectric resonator antenna 100, the TM _01δ mode resonance frequency was calculated to be 1.5 GHz. The dielectric resonator antenna 900 shown in FIG. 11 has a configuration in which the conductor resonator 4 is excluded from the configuration of the dielectric resonator antenna 100 and the dielectric resonator 3 is provided on the ground plate 1 except for the first dielectric plate 2. For, the resonance frequency of the TM _01δ mode was calculated to be 2.0 GHz. Furthermore, the dielectric resonator antenna of FIG. 12 is configured as described above except that the dielectric resonator 3 is provided on the ground plate 1 except for the first dielectric plate 2 from the configuration of the dielectric resonator antenna 100. For 910, the TM _01δ mode resonance frequency was calculated to be 1.28 GHz.

In FIG. 2, the dielectric resonator antenna 100 of FIG. 1, the dielectric resonator antenna 900 of FIG. 11, and the dielectric resonator antenna 910 of FIG. 12 are fed by a coaxial cable having a characteristic impedance of 50Ω under the above conditions. In this case, the frequency characteristic of the input reflection characteristic S ₁₁ is shown. The position of the resonance frequency of the TM _01δ mode is _{indicated by the} symbol a for the dielectric resonator antenna 100 of FIG. 1, the symbol b for the dielectric resonator antenna 900 of FIG. 11, and the symbol c for the dielectric resonator antenna 910 of FIG. It showed in. Since the dielectric resonator antenna 910 of FIG. 12 has the conductor block 4, the resonance frequency is lowered by about 36% compared to the dielectric resonator antenna 900 of FIG. That is, the dielectric resonator antenna 910 of FIG. 12 can be downsized to about 65% of the dielectric resonator antenna 900 of FIG. However, the fractional bandwidth of the input reflection characteristic S ₁₁ equal to or less than -10dB is only 1% relative to 0.1GHz about the center frequency 1.28GHz. The “ratio band” indicates the ratio of the bandwidth to the resonance frequency.

On the other hand, the dielectric resonator antenna 100 of FIG. 1 which is an embodiment of the present invention has a resonance frequency reduced by about 25% compared to the dielectric resonator antenna 900 of FIG. Is possible. In addition to this, it can be seen that the ratio band where the input reflection characteristic S ₁₁ is −10 dB or less is about 0.16 GHz, which is a wide band of 11% with respect to the center frequency of 1.5 GHz. This is comparable to the 15% specific band characteristic of a monopole antenna. Also, the height of the antenna has been lowered to about 34% compared to the monopole. As described above, according to the present invention, it is possible to configure a very useful dielectric resonator antenna that achieves both miniaturization (volume and height) and wideband characteristics.

  FIG. 3 shows the frequency of the polarization perpendicular to the ground plate in the plane perpendicular to the ground plate 1 with the rotational symmetry axis direction of the dielectric resonator 3 of the dielectric resonator antenna 100 of FIG. An example of the directivity pattern used as a parameter is shown. The simulation was performed such that the rotational symmetry axis of the dielectric resonator 3 passes through the center of the square ground plate 1 of 200 mm × 200 mm. It can be seen that the dielectric resonator antenna 100 of FIG. 1 exhibits a directivity pattern similar to that of the monopole antenna.

  In this embodiment, the thickness of the first dielectric plate 2 is 2 mm (about 1/100 of the wavelength λ of the radio wave at the resonance frequency) and the relative dielectric constant is 1 (equivalent to air). Similar characteristics can be realized if the dielectric constant is small and the relative dielectric constant is smaller than about 2.

[Comparative example]
As another consideration, the dielectric resonator antenna having the configuration as shown in FIG. 4 is configured, and how the band in which the input reflection characteristic S ₁₁ is −10 dB or less with respect to the radius a of the first dielectric plate 2 is determined. It was simulated whether it changed to. Here, under the same conditions as in the above simulation, the thick portion of the ground plate 1 is not the first dielectric plate 2 but the thick portion of the ground plate 1 in the portion far from the radius a from the rotational symmetry axis of the dielectric resonator 3. It was assumed that it was in direct contact with the resonator 3. That is, in the configuration of FIG. 1, the first dielectric plate 2 is replaced with a doughnut-shaped dielectric plate 2 having a hole 20 and an outer peripheral radius a and a conductor on the outer periphery thereof.

FIG. 5 shows the simulation results. When the radius a of the outer periphery of the donut plate-like dielectric plate 2 coincides with the conductor block 4, that is, there is no donut plate-like dielectric plate 2 and the case of the dielectric resonator antenna 910 of the conventional example of FIG. This is increased in order until the radius a ₀ of the outer periphery of the dielectric resonator 3 is sufficiently exceeded. When the radius a of the outer periphery of the doughnut-shaped dielectric plate 2 is sufficiently smaller than the radius a ₀ of the outer periphery of the dielectric resonator 3, that is, when the ground plate 1 is in contact with the dielectric resonator 3, the dielectric resonance The bandwidth of the antenna is narrow and there is not much change. As the radius a of the outer periphery of the doughnut-shaped dielectric plate 2 approaches the radius a ₀ of the outer periphery of the dielectric resonator 3, the specific band suddenly increases. When the radius a of the outer periphery of the doughnut-shaped dielectric plate 2 is larger than the radius a ₀ of the outer periphery of the dielectric resonator 3, the specific band becomes wider. When the radius a of the outer periphery of the doughnut-shaped dielectric plate 2 is sufficiently larger than the radius a ₀ of the outer periphery of the dielectric resonator 3, the specific band is constant. Thus, it is preferable that the dielectric resonator 3 is not in contact with, for example, the ground plate 1 except for the conductor block 4.

  In the first embodiment, when the first dielectric plate 2 is “air or other gas or void”, the dielectric plate 2 is removed from the configuration of FIG. At this time, the conductor lump 4 may be used to support the dielectric resonator 3, or an insulator that supports the dielectric resonator 3 may be provided at an arbitrary position.

  FIG. 6 shows a configuration of a dielectric resonator antenna 200 according to a second specific example of the present invention. FIG. FIG. 6A is a perspective view showing the configuration of the dielectric resonator antenna 200, FIG. B is a cross-sectional view showing the configuration of the dielectric resonator antenna 600. FIG. The dielectric resonator antenna 200 of FIG. 6 has the same configuration as the dielectric resonator antenna 100 of FIG. 1 except that the first dielectric plate 2 exists only below the dielectric resonator 3. . According to this configuration, for example, when the relative dielectric constant of the first dielectric plate 2 is smaller than about 2, the same effect as that of the first embodiment can be obtained. Further, since only a small amount of the dielectric plate 2 is required, the cost can be reduced.

  FIG. 7 shows the configuration of a dielectric resonator antenna 300 according to a specific third embodiment of the present invention. FIG. FIG. 7A is a sectional view showing the configuration of the dielectric resonator antenna 300, FIG. B is a plan view showing the positional relationship between the ground plate 1 (shown by a solid line), which is a part of the configuration of the dielectric resonator antenna 300, and other components (shown by a broken line). Since the dielectric resonator antenna 300 of FIG. 7 performs a power feeding method using a microstrip line as compared with the dielectric resonator antenna 100 of FIG. 1, the second dielectric plate 7 on the back surface of the ground plate 1, The difference is that a microstrip 8 is provided and a rectangular slot 10 s is provided in the ground plate 1. The microstrip 8 and the ground plate 1 form a microstrip line across the second dielectric plate 7. Power is fed from the microstrip line to the dielectric resonator 3 by electromagnetic coupling through the microstrip 8 and the rectangular slot 10 s of the ground plate 1. According to the present embodiment, a simple power supply means that is plate-shaped and does not have a connection point can be realized. In the present embodiment, it is assumed that the thickness of the ground plate 1 is very small compared to the wavelength (the thickness is less than one thousandth of the wavelength at the operating frequency), but the thickness of the ground plate 1 is thick. The slot 10s may be filled with a dielectric material having a high relative dielectric constant.

  FIG. 8 shows the configuration of a dielectric resonator antenna 400 according to a fourth specific example of the present invention. FIG. FIG. 8A is a sectional view showing the configuration of the dielectric resonator antenna 400, FIG. B shows the positional relationship between the first dielectric plate 2 and the annular dielectric 9 (both shown by solid lines), which are part of the configuration of the dielectric resonator antenna 400, with other components (shown by broken lines). FIG. The dielectric resonator antenna 400 of FIG. 8 is compared with the dielectric resonator antenna 300 of FIG. 7 in the region where the annular portion of the first dielectric plate 2 passes through the upper portion of the slot 10s. 1 except that it is replaced by an annular dielectric 9 made of a dielectric having a dielectric constant higher than that of the dielectric plate 2. For example, the ground plate 1 is shown in FIG. B is configured. In the dielectric resonator antenna 400 of FIG. 8, power is fed from the microstrip line to the dielectric resonator 3 by electromagnetic coupling via the microstrip 8, the rectangular slot 10 s of the ground plate 1 and the annular dielectric 9. Done. By making the relative dielectric constant of the annular dielectric 9 larger than the relative dielectric constant of the first dielectric plate 2, electromagnetic coupling can be strengthened. In this embodiment, the dielectric 9 is annular, but it may be in the form of a slice that exists only in the upper part of the slot. In the present embodiment, it is assumed that the thickness of the ground plate 1 is very small compared to the wavelength (the thickness is less than one thousandth of the wavelength at the operating frequency), but the thickness of the ground plate 1 is thick. The slot 10s may be filled with a dielectric material having a high relative dielectric constant.

  FIG. 9 shows the configuration of a dielectric resonator antenna 500 according to a fifth specific embodiment of the present invention. FIG. FIG. 9A is a sectional view showing a configuration of a dielectric resonator antenna 500, FIG. B is a plan view showing a positional relationship between the ground plate 1 (shown by a solid line), which is a part of the configuration of the dielectric resonator antenna 500, and other components (shown by a broken line). The dielectric resonator antenna 500 of FIG. 9 is the same as the dielectric resonator antenna 300 of FIG. 7 except that the rectangular slot 10s of the ground plate 1 is an annular slot 10sr. In the dielectric resonator antenna 500 of FIG. 9, power is fed from the microstrip line to the dielectric resonator 3 by electromagnetic coupling via the microstrip 8 and the annular slot 10 sr of the ground plate 1. In the present embodiment, it is assumed that the thickness of the ground plate 1 is very small compared to the wavelength (the thickness is less than one thousandth of the wavelength at the operating frequency), but the thickness of the ground plate 1 is thick. The annular slot 10sr may be filled with a dielectric material having a high relative dielectric constant.

  FIG. 10 shows a configuration of a dielectric resonator antenna 600 according to a sixth specific example of the present invention. FIG. 10A is a cross-sectional view showing the configuration of a dielectric resonator antenna 600, FIG. B shows the positional relationship between the first dielectric plate 2 and the annular dielectric 9 (both shown by solid lines), which are part of the configuration of the dielectric resonator antenna 600, with other components (shown by broken lines). FIG. The dielectric resonator antenna 600 of FIG. 10 is the same as the dielectric resonator antenna 400 of FIG. 8 except that the rectangular slot 10s of the ground plate 1 is an annular slot 10sr. Also, the dielectric resonator antenna 600 of FIG. 10 passes through a part of the annular shape of the first dielectric plate 2 above the annular slot 10sr, as compared with the dielectric resonator antenna 500 of FIG. The area is the same except that it is replaced with an annular dielectric 9 made of a dielectric having a dielectric constant higher than that of the first dielectric plate 2. For example, the ground plate 1 is shown in FIG. B is configured. In the dielectric resonator antenna 600 of FIG. 10, power is fed from the microstrip line to the dielectric resonator 3 by electromagnetic coupling via the microstrip 8, the annular slot 10 sr of the ground plate 1 and the annular dielectric 9. Is called. By making the relative dielectric constant of the annular dielectric 9 larger than the relative dielectric constant of the first dielectric plate 2, electromagnetic coupling can be strengthened.

  In the third and fourth embodiments, when the first dielectric plate 2 is “air or other gas or void”, FIG. A and FIG. The dielectric plate 2 is removed from the configuration of A. At this time, the conductor lump 4 may be used to support the dielectric resonator 3, or an insulator that supports the dielectric resonator 3 may be provided at an arbitrary position. In the fifth and sixth embodiments, when the first dielectric plate 2 is “air or other gas or air gap”, FIG. A and FIG. The dielectric plate 2 is removed from the configuration of A. At this time, the conductor lump 4 and / or the annular dielectric 9 may be used to support the dielectric resonator 3, or another insulator that supports the dielectric resonator 3 may be provided at an arbitrary position. good.

  In the above embodiment, assuming that the dielectric resonator 3 is supported by the conductor mass 4 when the first dielectric plate 2 is “air or other gas or air gap”, the conductor mass 4 is Although it has a longer cylindrical configuration having the same radius as the cavity 30 of the body resonator 3, the conductor lump 4 only needs to be sufficiently grounded, for example, the cavity of the dielectric resonator 3 30 and may be electrically connected to the ground plate 1 with a smaller volume.

  The present invention is a transmission / reception antenna suitable for use in, for example, a car phone or a mobile phone mounted on a vehicle.

1. 1A is a perspective view illustrating a configuration of a dielectric resonator antenna 100 according to a first embodiment; B is also a cross-sectional view. The graph which shows the reflective characteristic of the dielectric resonator antenna 100. FIG. The graph which shows the directivity pattern of the dielectric resonator antenna. Sectional drawing which shows the structure of the dielectric resonator antenna which concerns on a comparative example. The graph which shows the specific band characteristic of the dielectric resonator antenna which concerns on a comparative example. 6). 5A is a perspective view illustrating a configuration of a dielectric resonator antenna 200 according to a second embodiment, and FIG. B is also a cross-sectional view. 7). 6A is a cross-sectional view showing the configuration of a dielectric resonator antenna 300 according to a third embodiment, and FIG. B is a plan view showing the shape of the ground plate 1 and the positional relationship with other components. 8). 7A is a cross-sectional view showing a configuration of a dielectric resonator antenna 400 according to a fourth embodiment, and FIG. B is a plan view showing the shape of the first dielectric plate 2 and the annular dielectric 9 and the positional relationship with other components. 9. FIG. 8A is a cross-sectional view showing the configuration of a dielectric resonator antenna 500 according to a fifth embodiment; B is a plan view showing the shape of the ground plate 1 and the positional relationship with other components. 10. 10A is a cross-sectional view showing a configuration of a dielectric resonator antenna 600 according to a fifth embodiment; B is a plan view showing the shape of the first dielectric plate 2 and the annular dielectric 9 and the positional relationship with other components. 11. FIG. 11A is a perspective view illustrating a configuration of a conventional dielectric resonator antenna 900; B is also a cross-sectional view. 12 11A is a perspective view showing a configuration of another conventional dielectric resonator antenna 910, and FIG. B is also a cross-sectional view.

Explanation of symbols

1: Ground plate 10: Hole portion of ground plate 10s: Slot formed in ground plate 10sr: Slot formed in ring 2: First dielectric plate (or gap)
20: Hole portion of first dielectric plate 3: Dielectric resonator 30: Cavity portion and side surface of dielectric resonator (inner surface of dielectric resonator)
31: Dielectric resonator (outer surface of dielectric resonator)
4: Conductor block 5: Coaxial cable 51: Coaxial cable central conductor 52: Coaxial cable outer conductor 53: Coaxial cable insulator sheath 6: Feed probe 7: Second dielectric plate 8: Microstrip 9: Ring dielectric body

Claims (7)

A ground plate made of a conductor;
A first dielectric plate disposed on the surface of the ground plate and made of a first dielectric having a relative dielectric constant of about 2 or less and having a hole;
A dielectric resonator comprising a columnar second dielectric having a relative permittivity of approximately 10 to approximately 100 and having a columnar cavity portion disposed vertically on the dielectric plate and having a columnar cavity along its central axis;
One end of which is short-circuited to the ground plate through the hole of the first dielectric plate, and is provided so as to fill at least the columnar cavity of the dielectric resonator;
A dielectric resonator antenna, comprising: a power feeding means for feeding power to the dielectric resonator. 2. The dielectric resonator antenna according to claim 1, wherein the first dielectric plate is air or other gas or air gap. The power supply to the dielectric resonator is performed by a conductor coupled linearly in parallel with the central axis of the columnar dielectric resonator on the outer surface of the dielectric resonator. The dielectric resonator antenna according to claim 1 or 2. A second dielectric plate disposed on the back surface of the ground plate, made of a third dielectric, and having a slot below the dielectric resonator;
A conductor line provided on the second dielectric plate surface, which forms a strip line in combination with the ground plate;
4. The dielectric resonator according to claim 1, wherein power feeding to the dielectric resonator is performed by electromagnetic coupling through the slot from the strip line. 5. antenna. The dielectric resonator antenna according to claim 4, wherein the slot is formed in an annular shape. A fourth dielectric disposed at a lower portion of the dielectric resonator and having a relative dielectric constant equal to or greater than a relative dielectric constant of the second dielectric;
The power supply to the dielectric resonator is by electromagnetic coupling through the slot from the strip line and the fourth electric body, and the slot is positioned below the fourth dielectric. 6. The dielectric resonator antenna according to claim 4 or 5, wherein: _{7. The dielectric} resonator according to claim 1, wherein the dielectric resonator has a cylindrical shape having a cylindrical cavity, and is designed to have a TM _01δ resonance mode at a desired frequency. 2. The dielectric resonator antenna according to claim 1.

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