WO2015087974A1 - 誘電体共振器,誘電体フィルタおよび通信装置 - Google Patents
誘電体共振器,誘電体フィルタおよび通信装置 Download PDFInfo
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- WO2015087974A1 WO2015087974A1 PCT/JP2014/082853 JP2014082853W WO2015087974A1 WO 2015087974 A1 WO2015087974 A1 WO 2015087974A1 JP 2014082853 W JP2014082853 W JP 2014082853W WO 2015087974 A1 WO2015087974 A1 WO 2015087974A1
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- conductor
- dielectric
- electrically connected
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- resonator
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators
- H01P1/2086—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators multimode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/10—Dielectric resonators
- H01P7/105—Multimode resonators
Definitions
- the present invention relates to a dielectric resonator, a dielectric filter, and a communication device having excellent electrical characteristics.
- the present invention has been devised in view of such problems in the prior art, and an object thereof is a dielectric resonator having a simple structure and easy to manufacture, a dielectric filter using the same, and a communication Providing a device.
- the dielectric resonator of the present invention includes a dielectric, a first conductor, a second conductor, a third conductor, a fourth conductor, and a fifth conductor, and the dielectric is a first conductor.
- a columnar first portion having a first surface located at an end in a direction and a second surface located at an end in a second direction opposite to the first direction; and perpendicular to the first direction
- a column-shaped second portion having a third surface located at the end in the third direction and a fourth surface located at the end in the fourth direction opposite to the third direction.
- the first portion and the second portion have a shape intersecting each other, and the first conductor accommodates the dielectric in a cavity formed therein, and is spaced from the first conductor.
- the second conductor is provided on the first surface. Electrically connected to the first inner surface, the third conductor is provided on the second surface, and an end in the second direction is electrically connected to the second inner surface,
- the fourth conductor is provided on the third surface, the end in the third direction is electrically connected to the third inner surface, and the fifth conductor is provided on the fourth surface.
- the end in the fourth direction is electrically connected to the fourth inner surface, and the dielectric is a portion of the first portion that is not sandwiched between the second conductor and the third conductor.
- a third portion and a fourth portion that is not sandwiched between the fourth conductor and the fifth conductor in the second portion And it has a.
- the dielectric filter of the present invention includes the dielectric resonator, a tenth conductor, and an eleventh conductor, and the tenth conductor is a linear conductor and has a first end that is one end. And a second end that is the other end, the first end is connected to the second conductor or the third conductor, and the second end is provided on the first conductor.
- Exposed to the outside through the formed first through hole, electromagnetically coupled to the first portion, and the eleventh conductor is a linear conductor, and a third end that is one end; A fourth end that is the other end, the third end is connected to the fourth conductor or the fifth conductor, and the fourth end is provided on the first conductor. It is exposed to the outside through the second through hole and is electromagnetically coupled to the second portion.
- the communication device of the present invention includes an antenna, a communication circuit, and the dielectric filter that connects the antenna and the communication circuit.
- a dielectric resonator having a simple structure and easy to manufacture can be obtained.
- a dielectric filter having a simple structure and easy to manufacture can be obtained.
- a communication apparatus that can be easily manufactured can be obtained.
- FIG. 1 is a perspective view schematically showing a dielectric resonator according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along line A-A ′ of FIG. 1.
- FIG. 2 is a sectional view taken along line B-B ′ of FIG. 1.
- FIG. 2 is a sectional view taken along line C-C ′ of FIG. 1.
- It is a perspective view which shows typically the dielectric material filter of 2nd Embodiment of this invention.
- FIG. 6 is a sectional view taken along line D-D ′ of FIG. 5.
- FIG. 6 is a cross-sectional view taken along line E-E ′ of FIG. 5.
- FIG. 6 is a cross-sectional view taken along the line F-F ′ of FIG. 5.
- FIG. 1 is a perspective view schematically showing a dielectric resonator according to a first embodiment of the present invention.
- 2 is a cross-sectional view taken along the line AA ′ in FIG. 1 (a cut surface parallel to the yz plane including the AA ′ line (a cut surface that bisects the conductor 11 in the + x direction) viewed from the + x direction.
- 3 is a cross-sectional view taken along the line BB ′ of FIG. 1 (a cut surface parallel to the xy plane including the line BB ′ (a cut surface that bisects the conductor 11 in the + z direction) viewed from the + z direction. ).
- FIG. 4 is a cross-sectional view taken along the line CC ′ of FIG. 1 (a cut surface parallel to the xz plane including the CC ′ line (a cut surface that bisects the conductor 11 in the + y direction) viewed from the + y direction. ). Note that FIG. 1 shows a state in which the conductor 11 is seen through in order to make the structure easy to understand.
- the dielectric resonator includes a dielectric 50, a conductor 11, a conductor 12, a conductor 13, a conductor 14, a conductor 15, a conductor 16, and a conductor. 17, a conductor 18, and a conductor 19.
- the dielectric 50 has a shape in which the first portion 51 and the second portion 52 intersect each other.
- the first portion 51 is a columnar portion extending in the first direction (+ z direction), the surface 21 located at the end of the first direction (+ z direction), and the second direction (the direction opposite to the first direction). And a surface 22 located at the end in the ⁇ z direction).
- the second portion 52 is a columnar portion extending in the third direction (+ x direction) perpendicular to the first direction, and the surface 23 located at the end of the third direction (+ x direction) and the direction opposite to the third direction And a surface 24 located at the end in the fourth direction ( ⁇ x direction).
- dielectric materials such as dielectric ceramics can be used.
- a dielectric ceramic material containing BaTiO 3 , Pb 4 Fe 2 Nb 2 O 12 , TiO 2 or the like can be preferably used.
- a resin such as an epoxy resin may be used.
- the case where the first portion 51 and the second portion 52 are quadrangular prisms is shown, but other shapes such as hexagonal prisms and cylinders may be used.
- the conductor 11 has a rectangular parallelepiped box shape.
- the conductor 11 houses the dielectric 50 in a cavity 45 formed therein, and is disposed so as to surround the dielectric 50 with a gap.
- the conductor 11 includes an inner surface 31 that faces the surface 21 of the dielectric 50, an inner surface 32 that faces the surface 22 of the dielectric 50, an inner surface 33 that faces the surface 23 of the dielectric 50, and the surface of the dielectric 50. 24 and an inner surface 34 opposite to it.
- the case where the outer shape of the conductor 11 is a rectangular parallelepiped shape is shown, but other shapes such as a sphere or a dodecahedron may be used.
- the conductor 12 is a columnar conductor extending in the + z direction.
- the conductor 12 is provided on the surface 21 of the dielectric 50.
- the end of the conductor 12 in the first direction (+ z direction) is electrically connected to the inner surface 31 of the conductor 11 by joining or contacting the inner surface 31 of the conductor 11.
- the conductor 13 is a columnar conductor extending in the + z direction.
- the conductor 13 is provided on the surface 22 of the dielectric 50.
- the end portion of the conductor 13 in the second direction ( ⁇ z direction) is electrically connected to the inner surface 32 of the conductor 11 by joining or contacting the inner surface 32 of the conductor 11.
- the conductor 14 has a rectangular parallelepiped shape.
- the conductor 14 is disposed between the conductor 12 and the conductor 11 in the fifth direction (+ y direction) perpendicular to the first direction and the third direction.
- An end portion of the conductor 14 in the fifth direction (+ y direction) is electrically connected to the conductor 11 by joining or contacting the conductor 11.
- An end portion of the conductor 14 in the direction opposite to the fifth direction ( ⁇ y direction) is electrically connected to the conductor 12 by joining or contacting the conductor 12.
- An end portion of the conductor 14 in the first direction (+ z direction) is electrically connected to the conductor 11 by joining or contacting the inner surface 31 of the conductor 11.
- the conductor 15 has a rectangular parallelepiped shape.
- the conductor 15 is disposed between the conductor 13 and the conductor 11 in the fifth direction (+ y direction).
- An end portion of the conductor 15 in the fifth direction (+ y direction) is electrically connected to the conductor 11 by joining or contacting the conductor 11.
- the end portion of the conductor 15 in the direction opposite to the fifth direction ( ⁇ y direction) is electrically connected to the conductor 13 by joining or contacting the conductor 13.
- An end portion of the conductor 15 in the second direction ( ⁇ z direction) is electrically connected to the conductor 11 by joining or contacting the inner surface 32 of the conductor 11.
- the conductor 16 is a columnar conductor extending in the + x direction.
- the conductor 16 is provided on the surface 23 of the dielectric 50.
- the end of the conductor 16 in the third direction (+ x direction) is electrically connected to the inner surface 33 of the conductor 11 by joining or contacting the inner surface 33 of the conductor 11.
- the end portion of the conductor 16 in the fourth direction ( ⁇ x direction) is bonded or in contact with the surface 23 of the dielectric 50.
- the conductor 17 is a columnar conductor extending in the + x direction.
- the conductor 17 is provided on the surface 24 of the dielectric 50.
- the end portion of the conductor 17 in the fourth direction ( ⁇ x direction) is electrically connected to the inner surface 34 of the conductor 11 by joining or contacting the inner surface 34 of the conductor 11.
- the conductor 18 has a rectangular parallelepiped shape.
- the conductor 18 is disposed between the conductor 16 and the conductor 11 in a sixth direction ( ⁇ y direction) perpendicular to the first direction and the third direction.
- the end portion of the conductor 18 in the sixth direction ( ⁇ y direction) is electrically connected to the conductor 11 by joining or contacting the conductor 11.
- the end of the conductor 18 in the direction opposite to the sixth direction (+ y direction) is electrically connected to the conductor 16 by joining or contacting the conductor 16.
- the end portion of the conductor 18 in the third direction (+ x direction) is electrically connected to the inner surface 33 of the conductor 11 by joining or contacting the inner surface 33 of the conductor 11.
- the conductor 19 has a rectangular parallelepiped shape.
- the conductor 19 is disposed between the conductor 17 and the conductor 11 in the sixth direction ( ⁇ y direction).
- the end portion of the conductor 19 in the sixth direction ( ⁇ y direction) is electrically connected to the conductor 11 by joining or contacting the conductor 11.
- the end of the conductor 19 in the direction opposite to the sixth direction (+ y direction) is electrically connected to the conductor 17 by joining or contacting the conductor 17.
- the end portion of the conductor 19 in the fourth direction ( ⁇ x direction) is electrically connected to the inner surface 34 of the conductor 11 by joining or contacting the inner surface 34 of the conductor 11.
- the dielectric 50 has a third portion 53 and a fourth portion 54.
- the third portion 53 is a portion that is not sandwiched between the conductor 12 and the conductor 13 in the first portion 51, and is located on the opposite side ( ⁇ y direction) to the fifth direction in the first portion 51.
- the fourth portion 54 is a portion that is not sandwiched between the conductor 16 and the conductor 17 in the second portion 52, and is located in a direction opposite to the sixth direction (+ y direction side) in the second portion 52.
- a groove 55 is formed in the dielectric 50.
- the groove 55 is formed at a portion where the first portion 51 and the second portion 52 intersect, and is formed over the entire + y direction.
- Such a groove 55 has a function of degenerating the two resonance modes, and the shape of the groove 55 is appropriately adjusted according to desired characteristics.
- the conductor 12, the conductor 13, the conductor 16, and the conductor 17 are quadrangular prisms. However, other shapes such as hexagonal prisms and cylinders may be used. However, it is desirable that the conductor 12 and the conductor 13 have the same cross-sectional shape as that of the first portion 51 other than the third portion 53 when cut along a plane perpendicular to the + z direction.
- the conductor 16 and the conductor 17 desirably have the same cross-sectional shape as that of the second portion 52 other than the fourth portion 54 when cut along a plane perpendicular to the + x direction.
- the portions where the conductors 11 to 19 are electrically in contact with each other are electrically in contact with each other.
- it is desirable to be joined in terms of reliability.
- it since it is necessary to join so that it may become electrically conductive, it may join using solder and a conductive adhesive, and may join using a screw, a volt
- all or part of the conductors 11 to 19 may be integrally formed.
- all or part of the conductors 11 to 19 may be formed of a plurality of components. 1 to 4, the conductor 12 and the conductor 14 are integrally formed, the conductor 13 and the conductor 15 are integrally formed, the conductor 16 and the conductor 18 are integrally formed, and the conductor 17 And the conductor 19 are formed integrally.
- each of the conductor 12, the conductor 13, the conductor 16, and the conductor 17 and the dielectric 50 may be electrically in contact with each other, but is preferably joined in terms of reliability.
- Each of the conductor 12, the conductor 13, the conductor 16, and the conductor 17 and the dielectric 50 can be bonded using, for example, a conductive adhesive.
- the first plate conductor is baked on the surface 21 of the dielectric 50
- the second plate conductor is baked on the surface 22 of the dielectric 50
- the third plate conductor is baked on the surface 23 of the dielectric 50.
- the fourth plate-like conductor is baked onto the surface 24 of the dielectric 50
- the first columnar conductor is joined to the first plate-like conductor with solder or the like
- the second plate-like conductor is joined to the second plate-like conductor.
- the third columnar conductor may be joined to the third plate conductor by solder or the like
- the fourth columnar conductor may be joined to the fourth plate conductor by solder or the like.
- the composite of the first plate-shaped conductor and the first columnar conductor corresponds to the conductor 12 in the present embodiment
- the composite of the second plate-shaped conductor and the second columnar conductor is the main.
- the composite of the third plate-like conductor and the third columnar conductor corresponds to the conductor 16 in the present embodiment
- the fourth plate-like conductor and the fourth columnar conductor corresponds to the conductor 17 in the present embodiment.
- the conductors 11 to 19 can be formed using various known conductive materials such as metal and non-metal conductive materials.
- conductive materials such as metal and non-metal conductive materials.
- Ag In order to improve the characteristics of the dielectric resonator, for example, Ag, It is desirable to use a conductive material mainly composed of an Ag alloy such as Ag—Pd or Ag—Pt, or a Cu-based, W-based, Mo-based, or Pd-based conductive material.
- the inside of the cavity 45 is filled with air, it may be a vacuum or may be filled with a gas other than air.
- the dielectric resonator according to the present embodiment having such a configuration includes the third portion 53 and the second portion 52 in which the dielectric 50 is not sandwiched between the conductor 12 and the conductor 13 in the first portion 51.
- the fourth portion 54 is a portion not sandwiched between the conductor 16 and the conductor 17.
- the resonance frequency of the third resonance mode can be brought close to the resonance frequency of the first resonance mode and the resonance frequency of the second resonance mode to function as a triple mode resonator.
- the first resonance mode and the second resonance mode are modes in which an electric field directed in the + z direction or ⁇ z direction is generated in the first portion 51 and an electric field directed in the + x direction or ⁇ x direction is generated in the second portion 52.
- the third resonance mode is a mode in which an electric field directed in the + y direction or the ⁇ y direction is generated in the dielectric 50.
- the dielectric resonator of the present embodiment has a spurious mode resonance frequency having the lowest resonance frequency as compared with the conventional dielectric resonator having no conductors 12 to 19 as described in Patent Document 1. Therefore, it is possible to obtain a dielectric resonator having good electrical characteristics with a wide interval between the resonance frequency of the fundamental mode and the resonance frequency of the spurious mode.
- the dielectric resonator of the present embodiment is different from the conventional dielectric resonator in the spurious mode having the lowest resonance frequency, and it is considered that this effect is obtained by changing the resonance mode.
- the dielectric resonator of the present embodiment includes the conductor 14 and the conductor 15, the Q value in the fundamental mode resonance is increased as compared with the case where the conductor 14 and the conductor 15 are not included. Can do.
- the conductor 14 and the conductor 15 are not provided, current loss occurs in the conductor 12 and the conductor 13 due to the magnetic fields generated so as to surround the conductor 12 and the conductor 13, respectively, and the Q value is lowered by this action.
- the magnetic field generated so as to surround the conductor 12 and the conductor 13 can be reduced by the conductor 14 and the conductor 15, respectively. The value is estimated to improve.
- the dielectric resonator of the present embodiment includes the conductor 18 and the conductor 19, the Q value in the fundamental mode resonance is increased as compared with the case where the conductor 18 and the conductor 19 are not included. be able to.
- the conductor 18 and the conductor 19 are not provided, a current loss occurs in the conductor 16 and the conductor 17 due to the magnetic field generated so as to surround the conductor 16 and the conductor 17, respectively, and the Q value is lowered by this action.
- the magnetic field generated so as to surround the conductor 16 and the conductor 17 can be reduced by the conductor 18 and the conductor 19, so that the current loss in the conductor 16 and the conductor 17 is reduced and the Q value is reduced. Is estimated to improve.
- the conductor 14 is between the conductor 12 and the conductor 11 on the fifth direction (+ y direction) side of the conductor 12 and is a surface in the first direction (+ z direction). It is desirable to exist over the entire region between 21 and the inner surface 31.
- the conductor 15 is a region between the conductor 13 and the conductor 11 on the fifth direction (+ y direction) side of the conductor 13 and between the surface 22 and the inner surface 32 in the first direction (+ z direction). It is desirable to exist throughout. As a result, the magnetic fields generated so as to surround the conductor 12 and the conductor 13 can be further reduced, so that the current loss in the conductor 12 and the conductor 13 can be further reduced and the Q value can be further improved.
- the conductor 18 is between the conductor 16 and the conductor 11 on the sixth direction ( ⁇ y direction) side of the conductor 16, and in the third direction (+ x direction). It is desirable to exist over the entire area between the surface 23 and the inner surface 33.
- the conductor 19 is between the conductor 17 and the conductor 11 on the sixth direction ( ⁇ y direction) side of the conductor 17 and between the surface 24 and the inner surface 34 in the third direction (+ x direction). It is desirable to exist throughout the area. As a result, the magnetic field generated so as to surround the conductor 16 and the conductor 17 can be further reduced, so that the current loss in the conductor 16 and the conductor 17 can be further reduced and the Q value can be further improved.
- the fifth direction (+ y direction) and the sixth direction ( ⁇ y direction) are opposite to each other. That is, the direction in which the conductor 14 and the conductor 15 are located with respect to the conductor 12 and the conductor 13 and the direction in which the conductor 18 and the conductor 19 are located with respect to the conductor 16 and the conductor 17 are opposite directions.
- the direction in which the conductor 14 and the conductor 15 are located with respect to the conductor 12 and the conductor 13 and the direction in which the conductor 18 and the conductor 19 are located with respect to the conductor 16 and the conductor 17 are opposite directions.
- FIG. 5 is a perspective view schematically showing a dielectric filter according to a second embodiment of the present invention.
- 6 is a cross-sectional view taken along the line DD ′ of FIG. 5 (a cut surface parallel to the yz plane including the DD ′ line (a cut surface that bisects the conductor 11 in the + x direction) viewed from the + x direction. ).
- 7 is a cross-sectional view taken along the line EE ′ of FIG. 5 (a cut surface parallel to the xy plane including the line EE ′ (a cut surface that bisects the conductor 11 in the + z direction) viewed from the + z direction. ).
- FIG. 8 is a cross-sectional view taken along the line FF ′ of FIG. 5 (a cut surface parallel to the xz plane including the line FF ′ (a cut surface that bisects the conductor 11 in the + y direction) viewed from the + y direction. ).
- FIG. 5 shows a state in which the conductor 11 is seen through in order to make the structure easy to understand.
- a different part from 1st Embodiment mentioned above is demonstrated, the same code
- the dielectric filter of the present embodiment includes the dielectric resonator of the first embodiment described above, a conductor 61, and a conductor 62.
- the conductor 61 is a linear conductor, and includes an end portion 61a that is one end, an end portion 61b that is the other end, and a coupling portion that is a portion extending in the first direction (+ z direction) along the first portion 51. 61c.
- the coupling portion 61c is a portion that is coupled to the first portion 51 mainly by a magnetic field.
- the end portion 61 a is connected to the conductor 12, and the end portion 61 b is exposed to the outside through the through hole 41 formed in the conductor 11. Note that the end 61 a may be connected to the conductor 13 instead of the conductor 12. In this way, the conductor 61 is electromagnetically coupled to the first portion 51.
- the conductor 62 is a linear conductor, and is an end portion 62a which is one end, an end portion 62b which is the other end, and a coupling portion which is a portion extending in the third direction (+ x direction) along the second portion 52. 62c.
- the coupling portion 62c is a portion that couples with the second portion 52 mainly by a magnetic field.
- the end 62 a is connected to the conductor 16, and the end 62 b is exposed to the outside through the through hole 42 formed in the conductor 11. Note that the end 62 a may be connected to the conductor 17 instead of the conductor 16. In this way, the conductor 62 is electromagnetically coupled to the second portion 52.
- the coupling portion 61c is desirably formed in parallel to the + z direction, but may have a component in the + z direction and may be inclined with respect to the + z direction.
- the coupling portion 62c is desirably formed in parallel with the + x direction, but may have a component in the + x direction and may be inclined with respect to the + x direction. Further, the positions and lengths of the coupling portion 61c and the coupling portion 62c can be appropriately adjusted according to the desired magnitude of magnetic field coupling.
- the dielectric 50 when an electric signal is input from the end 61b of the conductor 61, the dielectric 50 resonates and an electric signal is output from the end 62b of the conductor 62. Is done. At this time, since a signal in a frequency band including the resonance frequencies of the first resonance mode, the second resonance mode, and the third resonance mode described above selectively passes, it functions as a bandpass filter.
- the dielectric filter of the present embodiment is configured using the dielectric resonator of the first embodiment that has a simple structure and is easy to manufacture. Thereby, a dielectric filter having a simple structure and easy to manufacture can be obtained.
- the dielectric filter of the present embodiment has a high Q value in the resonance of the fundamental mode, and has a good electrical characteristic with a wide interval between the resonance frequency of the fundamental mode and the resonance frequency of the spurious mode.
- a filter is formed using the dielectric resonator. Thereby, it is possible to obtain a dielectric filter having excellent electrical characteristics with a small insertion loss in the pass band and a large attenuation near the pass band.
- FIG. 9 is a block diagram schematically showing a communication device according to the third embodiment of the present invention.
- the communication device of this embodiment includes an antenna 82, a communication circuit 81, and a dielectric filter 80 that connects the antenna 82 and the communication circuit 81.
- the dielectric filter 80 is the dielectric filter of the second embodiment described above.
- the antenna 82 and the communication circuit 81 are well-known conventional ones.
- the communication device of this embodiment having such a configuration removes unnecessary electrical signals using the dielectric filter of the second embodiment that has a simple structure and is easy to manufacture. Obtainable.
- the electrical characteristics of the dielectric resonator according to the first embodiment shown in FIGS. 1 to 4 were calculated by simulation.
- the dielectric constituting the dielectric 50 has a relative dielectric constant of 60 and a dielectric loss tangent of 0.00005.
- the conductivity of the conductors 11 to 19 was 46.4 ⁇ 10 6 S / m.
- the inner shape of the conductor 11 (the outer shape of the cavity 45) was a rectangular parallelepiped having a dimension in the + x direction of 24 mm, a dimension in the + y direction of 24 mm, and a dimension in the + z direction of 20 mm.
- Each of the first portion 51 and the second portion 52 has a quadrangular prism shape with dimensions in three orthogonal directions of 3.7 mm, 5.7 mm, and 10 mm.
- the dielectric 50 has a shape in which the first portion 51 and the second portion 52 intersect each other at the center.
- the conductor 12, the conductor 13, the conductor 16, and the conductor 17 were formed in a quadrangular prism shape with dimensions in three orthogonal directions of 3.7 mm, 3.7 mm, and 5 mm.
- the conductor 14, the conductor 15, the conductor 18, and the conductor 19 are all in the same shape.
- the resonance frequencies of the three fundamental modes were 1.956 GHz, 1.973 GHz, and 2.058 GHz.
- the resonance frequency of the lowest spurious mode was 5.035 GHz.
- the electrical characteristics of the dielectric resonator of the comparative example shown in FIG. 10 were calculated by simulation.
- the dielectric resonator of the comparative example has a shape that does not include the conductor 12, the conductor 13, the conductor 14, the conductor 15, the conductor 16, the conductor 17, the conductor 18, and the conductor 19, Three columnar dielectrics were crossed at the center of each.
- the three columnar dielectrics have a rectangular column shape with dimensions of 6 mm, 6 mm, and 20 mm in three orthogonal directions.
- the inner shape of the conductor 11 (the outer shape of the cavity 45) was a rectangular parallelepiped shape with a dimension in the + x direction of 20 mm, a dimension in the + y direction of 20 mm, and a dimension in the + z direction of 20 mm.
- the resonance frequencies of the three fundamental modes were 2.044 GHz, 2.045 GHz, and 2.050 GHz.
- the resonance frequency of the spurious mode having the lowest frequency was 2.546 GHz.
- the dielectric resonator of the first embodiment has a significantly higher spurious mode resonance frequency, which is the lowest frequency, compared to the dielectric resonator of the comparative example, which is a conventional dielectric resonator. It can be seen that a large interval between the resonance frequency of the fundamental mode and the resonance frequency of the spurious mode can be secured. This confirmed the effectiveness of the present invention.
- the electrical characteristics of the dielectric filter of the second embodiment shown in FIGS. 5 to 8 were calculated by simulation.
- the dielectric constituting the dielectric 50 has a relative dielectric constant of 60 and a dielectric loss tangent of 0.00005.
- the shape of the dielectric 50 is the same as that of the first embodiment.
- Conductivities of conductors 11 to 19, conductor 61, and conductor 62 were 46.4 ⁇ 10 6 S / m.
- the shapes of the conductors 11 to 19 were the same as those in the first example.
- the result is shown in the graph of FIG. In the graph, the horizontal axis represents frequency and the vertical axis represents attenuation.
- the solid line indicates the transmission characteristic (S21), and the broken line indicates the reflection characteristic (S11).
- S21 transmission characteristic
- S11 reflection characteristic
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Abstract
Description
図1は、本発明の第1実施形態の誘電体共振器を模式的に示す斜視図である。図2は、図1のA-A’線断面図(A-A’線を含むyz平面に平行な切断面(導体11を+x方向に2等分する切断面)を+x方向から見た図)である。図3は、図1のB-B’線断面図(B-B’線を含むxy平面に平行な切断面(導体11を+z方向に2等分する切断面)を+z方向から見た図)である。図4は、図1のC-C’線断面図(C-C’線を含むxz平面に平行な切断面(導体11を+y方向に2等分する切断面)を+y方向から見た図)である。なお、図1においては、構造をわかりやすくするために、導体11を透視した状態を示している。
図5は、本発明の第2実施形態の誘電体フィルタを模式的に示す斜視図である。図6は、図5のD-D’線断面図(D-D’線を含むyz平面に平行な切断面(導体11を+x方向に2等分する切断面)を+x方向から見た図)である。図7は、図5のE-E’線断面図(E-E’線を含むxy平面に平行な切断面(導体11を+z方向に2等分する切断面)を+z方向から見た図)である。図8は、図5のF-F’線断面図(F-F’線を含むxz平面に平行な切断面(導体11を+y方向に2等分する切断面)を+y方向から見た図)である。なお、図5においては、構造をわかりやすくするために、導体11を透視した状態を示している。また、本実施形態においては、上述した第1実施形態と異なる部分について説明し、同様の構成要素には同様の符号を付して重複する説明を省略する。本実施形態の誘電体フィルタは、図5~図8に示すように、前述した第1実施形態の誘電体共振器と、導体61と、導体62とを有している。
図9は、本発明の第3実施形態の通信装置を模式的に示すブロック図である。本実施形態の通信装置は、アンテナ82と、通信回路81と、アンテナ82と通信回路81とを接続する誘電体フィルタ80とを有している。誘電体フィルタ80は、前述した第2実施形態の誘電体フィルタである。アンテナ82および通信回路81は、既知の従来のものである。
図1~図4に示した第1実施形態の誘電体共振器の電気特性をシミュレーションによって算出した。シミュレーションにおいて、誘電体50を構成する誘電体は、比誘電率を60とし、誘電正接を0.00005とした。導体11~19の導電率は46.4×106S/mとした。導体11の内側の形状(空洞45の外形)は、+x方向の寸法が24mm,+y方向の寸法が24mm,+z方向の寸法が20mmの直方体とし、空洞45の中央に誘電体50を配置した。第1部分51および第2部分52の各々は、直交する3方向の寸法が、3.7mm,5.7mm,10mmの四角柱状とした。誘電体50は、第1部分51および第2部分52が、各々の中央で交差した形状とした。導体12,導体13,導体16および導体17は、直交する3方向の寸法が、3.7mm,3.7mm,5mmの四角柱状とした。導体14,導体15,導体18および導体19は、全て同じ形状とした。その結果、3つの基本モード(第1共振モード,第2共振モードおよび第3共振モード)の共振周波数が、1.956GHz,1.973GHz,2.058GHzであった。また、最も周波数が低いスプリアスモードの共振周波数は、5.035GHzであった。
また、図5~図8に示した第2実施形態の誘電体フィルタの電気特性をシミュレーションによって算出した。シミュレーションにおいて、誘電体50を構成する誘電体は、比誘電率を60とし、誘電正接を0.00005とした。誘電体50の形状は、第1実施例と同じ形状とした。導体11~19,導体61および導体62の導電率は46.4×106S/mとした。導体11~19の形状は、第1実施例と同じ形状とした。その結果を図11のグラフに示す。グラフにおいて、横軸は周波数を示し、縦軸は減衰量を示している。また、実線が伝送特性(S21)を示し、破線が反射特性(S11)を示している。グラフによれば、2GHz付近の通過帯域中に、S11の3つのピークが確認でき、3重モード共振が生じていることがわかる。また、グラフによれば、通過帯域の挿入損失が小さく、且つ通過帯域近傍の減衰量が大きい優れた電気特性が得られていることがわかる。これにより本発明の更なる有効性が確認できた。
41,42:貫通孔
45:空洞
50,57:誘電体
51:第1部分
52:第2部分
53:第3部分
54:第4部分
80:誘電体フィルタ
81:通信回路
82:アンテナ
Claims (6)
- 誘電体と、第1導体と、第2導体と、第3導体と、第4導体と、第5導体とを有しており、
前記誘電体は、
第1方向の端部に位置する第1表面と、前記第1方向と反対方向である第2方向の端部に位置する第2表面と、を有する柱状の第1部分と、
前記第1方向に垂直な第3方向の端部に位置する第3表面と、前記第3方向と反対方向である第4方向の端部に位置する第4表面と、を有する柱状の第2部分と、
を有しており、
前記第1部分と前記第2部分とが互いに交差した形状を有しており、
前記第1導体は、
内部に形成された空洞内に前記誘電体を収容し、間隔を開けて前記誘電体を取り囲むように配置されており、
前記第1表面と対向する第1内面と、前記第2表面と対向する第2内面と、前記第3表面と対向する第3内面と、前記第4表面と対向する第4内面と、を有しており、
前記第2導体は、
前記第1表面に設けられており、前記第1方向の端部が前記第1内面に電気的に接続されており、
前記第3導体は、
前記第2表面に設けられており、前記第2方向の端部が前記第2内面に電気的に接続されており、
前記第4導体は、
前記第3表面に設けられており、前記第3方向の端部が前記第3内面に電気的に接続されており、
前記第5導体は、
前記第4表面に設けられており、前記第4方向の端部が前記第4内面に電気的に接続されており、
前記誘電体は、
前記第1部分において前記第2導体と前記第3導体とで挟まれていない部分である第3部分と、前記第2部分において前記第4導体と前記第5導体とで挟まれていない部分である第4部分と、を有している
ことを特徴とする誘電体共振器。 - 第6導体と、第7導体と、を更に有しており、
前記第6導体は、
前記第1方向および前記第3方向に垂直な第5方向において、前記第2導体と前記第1導体との間に配置されており、
前記第5方向の端部が前記第1導体に電気的に接続されており、前記第5方向と反対方向の端部が前記第2導体に電気的に接続されており、前記第1方向の端部が前記第1内面に電気的に接続されており、
前記第7導体は、
前記第5方向において、前記第3導体と前記第1導体との間に配置されており、
前記第5方向の端部が前記第1導体に電気的に接続されており、前記第5方向と反対方向の端部が前記第3導体に電気的に接続されており、前記第2方向の端部が前記第2内面に電気的に接続されている
ことを特徴とする請求項1に記載の誘電体共振器。 - 第8導体と、第9導体と、を更に有しており、
前記第8導体は、
前記第1方向および前記第3方向に垂直な第6方向において、前記第4導体と前記第1導体との間に配置されており、
前記第6方向の端部が前記第1導体に電気的に接続されており、前記第6方向と反対方向の端部が前記第4導体に電気的に接続されており、前記第3方向の端部が前記第3内面に電気的に接続されており、
前記第9導体は、
前記第6方向において、前記第5導体と前記第1導体との間に配置されており、
前記第6方向の端部が前記第1導体に電気的に接続されており、前記第6方向と反対方向の端部が前記第5導体に電気的に接続されており、前記第4方向の端部が前記第4内面に電気的に接続されている、
ことを特徴とする請求項2記載の誘電体共振器。 - 前記第5方向と前記第6方向とが互いに反対方向であることを特徴とする請求項3に記載の誘電体共振器。
- 請求項1乃至請求項4のいずれかに記載の誘電体共振器と、第10導体と、第11導体とを有しており、
前記第10導体は、
線状の導体であり、一方端である第1端部と、他方端である第2端部と、を有しており、
前記第1端部が前記第2導体または前記第3導体に接続され、前記第2端部が前記第1導体に設けられた第1の貫通孔を介して外部へ露出しており、前記第1部分と電磁気的に結合し、
前記第11導体は、
線状の導体であり、一方端である第3端部と、他方端である第4端部と、を有しており、
前記第3端部が前記第4導体または前記第5導体に接続され、前記第4端部が前記第1導体に設けられた第2の貫通孔を介して外部へ露出しており、前記第2部分と電磁気的に結合する
ことを特徴とする誘電体フィルタ。 - アンテナと、通信回路と、前記アンテナと前記通信回路とを接続する請求項5に記載の誘電体フィルタと、を有していることを特徴とする通信装置。
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|---|---|---|---|
| JP2015552513A JP6068678B2 (ja) | 2013-12-13 | 2014-12-11 | 誘電体共振器,誘電体フィルタおよび通信装置 |
| US15/100,416 US9871280B2 (en) | 2013-12-13 | 2014-12-11 | Dielectric resonator, dielectric filter, and communication apparatus |
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| JP2013258213 | 2013-12-13 | ||
| JP2013-258213 | 2013-12-13 |
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| US (1) | US9871280B2 (ja) |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0157804U (ja) * | 1987-10-02 | 1989-04-11 | ||
| JPH0567905A (ja) * | 1991-09-09 | 1993-03-19 | Murata Mfg Co Ltd | 誘電体共振器装置 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4623857A (en) * | 1984-12-28 | 1986-11-18 | Murata Manufacturing Co., Ltd. | Dielectric resonator device |
| JPH0770882B2 (ja) * | 1987-06-16 | 1995-07-31 | 株式会社村田製作所 | 導波管型誘電体フィルタ |
| JP2882146B2 (ja) | 1991-12-13 | 1999-04-12 | 株式会社村田製作所 | 直交tm多重モード誘電体共振器装置 |
| JP3339223B2 (ja) * | 1994-12-26 | 2002-10-28 | 株式会社村田製作所 | 誘電体共振器装置 |
| CN100583551C (zh) * | 2003-01-24 | 2010-01-20 | 株式会社村田制作所 | 多模介电谐振装置、介电滤波器、复合介电滤波器及通信设备 |
-
2014
- 2014-12-11 US US15/100,416 patent/US9871280B2/en not_active Expired - Fee Related
- 2014-12-11 JP JP2015552513A patent/JP6068678B2/ja not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0157804U (ja) * | 1987-10-02 | 1989-04-11 | ||
| JPH0567905A (ja) * | 1991-09-09 | 1993-03-19 | Murata Mfg Co Ltd | 誘電体共振器装置 |
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| US9871280B2 (en) | 2018-01-16 |
| US20160308265A1 (en) | 2016-10-20 |
| JP6068678B2 (ja) | 2017-01-25 |
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