WO2016047531A1 - 共振器、フィルタおよび通信装置 - Google Patents
共振器、フィルタおよび通信装置 Download PDFInfo
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- WO2016047531A1 WO2016047531A1 PCT/JP2015/076316 JP2015076316W WO2016047531A1 WO 2016047531 A1 WO2016047531 A1 WO 2016047531A1 JP 2015076316 W JP2015076316 W JP 2015076316W WO 2016047531 A1 WO2016047531 A1 WO 2016047531A1
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- resonator
- conductor
- dielectric
- columnar body
- joined
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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
- H01P7/04—Coaxial resonators
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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
- H01P1/2002—Dielectric waveguide filters
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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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
- H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other
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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
Definitions
- the present invention relates to a resonator and a filter and a communication device using the resonator.
- a resonator in which a columnar conductor with one end grounded is accommodated in a shield case is known (see, for example, Patent Document 1). Further, a resonator in which a columnar dielectric is accommodated in a shield case is known (see, for example, Patent Document 2).
- JP 2011-35792 A Japanese Utility Model Publication No. 63-159904
- Patent Document 1 and Patent Document 2 have a problem that the electrical characteristics deteriorate when the size is reduced.
- the present invention has been devised in view of such problems in the prior art, and an object thereof is to provide a small resonator having excellent electrical characteristics, and a filter and a communication device using the resonator. It is to provide.
- a resonator includes a first conductor located on a first direction side and a second conductor located on a second direction side opposite to the first direction.
- a shield conductor having a cavity inside, and a dielectric or a conductor, having a columnar shape, being in the cavity, and having an end in the first direction on the first conductor.
- a columnar body that is joined and has a gap between the end in the second direction and the shield conductor, and in the cavity, and the end in the second direction is joined to the second conductor. And having an interval between the end in the first direction and the shield conductor, and one or more first dielectrics surrounding the columnar body with a space therebetween.
- Each of the filters according to an embodiment of the present invention has the same structure as the resonator and is arranged in a row so as to be electromagnetically coupled to each other.
- a plurality of resonators including a first resonator located at the second end and a second resonator located at the other end of the row; and a first terminal electrode electrically or electromagnetically connected to the first resonator; A second terminal electrode electrically or electromagnetically connected to the second resonator.
- a communication apparatus includes an antenna, a communication circuit, and the filter connected to the antenna and the communication circuit.
- a small resonator having excellent electrical characteristics can be obtained.
- a small filter having excellent electrical characteristics can be obtained.
- a communication apparatus having a small size and good communication quality can be obtained.
- FIG. 2 is a cross-sectional view taken along the line AB of FIG. It is a perspective view showing typically a part of component of the resonator of a 1st embodiment of the present invention. It is a perspective view which shows typically the other component of the resonator of 1st Embodiment of this invention. It is a perspective view which shows typically a part of component of the resonator of 2nd Embodiment of this invention. It is sectional drawing which shows typically the resonator of 3rd Embodiment of this invention.
- FIG. 7 is a cross-sectional view taken along line CD of FIG.
- FIG. 12 is a sectional view taken along line EF in FIG. 11. It is sectional drawing which shows typically the filter of 6th Embodiment of this invention. It is a block diagram which shows typically the communication apparatus of 7th Embodiment of this invention.
- FIG. 1 is a cross-sectional view schematically showing a resonator according to a first embodiment of the present invention.
- 2 is a cross-sectional view taken along the line AB of FIG. 3 and 4 are perspective views schematically showing some of the components of the resonator according to the first embodiment of the present invention.
- the resonator according to this embodiment includes a shield conductor 10, a columnar body 21, and a first dielectric 12.
- the shield conductor 10 has a first conductor 13 and a second conductor 14.
- the shield conductor 10 has a rectangular parallelepiped box shape having a cavity 19 inside, and is connected to a reference potential (referred to as a ground potential or an earth potential).
- the shield conductor 10 is configured by joining a first conductor 13 located on the ⁇ z direction side and a second conductor 14 located on the + z direction side with a conductive joining member (not shown).
- the first conductor 13 has a rectangular parallelepiped box shape having an opening on the + z direction side.
- the second conductor 14 has a rectangular flat plate shape.
- the first conductor 13 has a through hole 16 and a through hole 17. The through hole 16 and the through hole 17 are used for connection with an external circuit.
- the first conductor 13 and the second conductor 14 can be formed using various known conductive materials such as metal and non-metal conductive materials.
- a conductive material mainly composed of an Ag alloy such as Ag, Ag-Pd, Ag-Pt, a Cu-based, W-based, Mo-based, Pd-based conductive material, or the like. It is desirable to use
- the conductive bonding member for bonding the first conductor 13 and the second conductor 14 various known conductive bonding members such as solder and a conductive adhesive can be used.
- the first conductor 13 and the second conductor 14 may be joined using screws or bolts.
- the inside of the cavity 19 is filled with air, it may be a vacuum or may be filled with a gas other than air.
- the columnar body 21 is disposed at the center of the cavity 19 and has a columnar shape extending in the + z direction. Further, the end of the columnar body 21 in the ⁇ z direction is joined to the first conductor 13 by a conductive joining member (not shown). There is a gap between the end of the columnar body 21 in the + z direction and the shield conductor 10. That is, the entire ⁇ z-direction surface of the columnar body 21 is joined to the first conductor 13, and there is a gap between the + z-direction surface of the columnar body 21 and the shield conductor 10 (second conductor 14). .
- the columnar body 21 is made of a conductor, and the resonator of this embodiment functions as a resonator having a resonance mode similar to the TEM mode.
- the columnar body 21 may be made of a dielectric, and in that case, it functions as a resonator having a resonance mode similar to the TM mode.
- the columnar body 21 of the present embodiment can be formed using various known conductive materials such as metals and non-metal conductive materials.
- a conductive material mainly composed of an Ag alloy such as Ag, Ag-Pd, Ag-Pt, a Cu-based, W-based, Mo-based, Pd-based conductive material, or the like. It is desirable to use
- the first dielectric 12 is disposed at the center of the cavity 19 and has a cylindrical shape extending in the + z direction.
- the columnar body 21 is located at the center inside the first dielectric 12.
- the first dielectric 12 surrounds the columnar body 21 with a space from the columnar body 21.
- the first dielectric 12 is joined to the second conductor 14 at the end in the + z direction by a conductive joining member (not shown).
- a conductive joining member not shown.
- the length of the columnar body 21 in the + z direction is preferably 80% or more of the dimension of the cavity 19 in the + z direction, and more preferably 90% or more of the dimension of the cavity 19 in the + z direction. Further, it is desirable that more than half of the columnar body 21 in the + z direction is surrounded by the first dielectric 12.
- the ratio of the length in the + z direction of the portion surrounded by the first dielectric 12 in the columnar body 21 to the length in the + z direction of the columnar body 21 is desirably 50% or more, and more desirably 80% or more. 90% or more is more desirable.
- the size of the cavity 19, the diameter of the columnar body 21, the distance between the columnar body 21 and the first dielectric 12, and the thickness of the first dielectric 12 are the desired size, the resonance frequency of the fundamental mode resonance, and the higher-order mode resonance. Is set as appropriate according to the resonance frequency.
- a known dielectric material 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.
- conductive bonding member for bonding the first dielectric 12 and the shield conductor 10 various known conductive bonding members such as a conductive adhesive can be used. Further, for example, a conductor film may be formed on the first dielectric 12, and the conductor film and the shield conductor 10 may be joined using solder or the like. In that case, the conductor film and the solder function as a conductive bonding member.
- the resonator includes the shield conductor 10, the columnar body 21, and the first dielectric 12.
- the shield conductor 10 includes a first conductor 13 positioned on the ⁇ z direction side and a second conductor 14 positioned on the + z direction side opposite to the ⁇ z direction, and includes a cavity 19 therein.
- the columnar body 21 is composed of a conductor, has a columnar shape, is in the cavity 19, has an end in the ⁇ z direction joined to the first conductor 13, and an end in the + z direction and a shield conductor 10 with an interval.
- the first dielectric 12 is in the cavity 19, the end in the + z direction is joined to the second conductor 14, has a gap between the end in the ⁇ z direction and the shield conductor 10, and the columnar body
- the columnar body 21 is surrounded by a space 21.
- the resonator according to the present embodiment having such a configuration functions as a resonator having a resonance mode similar to the TEM mode.
- the conventional resonator described in Patent Document 1 has a problem that it is difficult to reduce the size. If the entire inside of the shield case is reduced in size by being filled with a dielectric, the resonance frequency of the higher-order mode resonance is greatly reduced, approaching the resonance frequency of the fundamental mode resonance, and the electrical characteristics deteriorate. appear. Further, when a dielectric is disposed between the open end of the columnar conductor and the shield case to reduce the size, there arises a problem that the Q value is greatly reduced and the electrical characteristics are deteriorated.
- the resonator according to the present embodiment having the above-described configuration can be made smaller than the resonator described in Patent Document 1, and the entire inside of the shield case of the resonator described in Patent Document 1 is filled with a dielectric. It is possible to suppress a decrease in the resonance frequency of higher-order mode resonance than in the case where a dielectric is disposed between the open end of the columnar conductor of the resonator described in Patent Document 1 and the shield case. Can be suppressed. That is, the resonator according to this embodiment has a large difference between the resonance frequency of the fundamental mode resonance and the resonance frequency of the higher-order mode resonance, a high Q value, and excellent electrical characteristics, and is small. That is, the resonator of this embodiment is small and has excellent electrical characteristics.
- the end of the columnar body 21 in the ⁇ z direction is joined to the first conductor 13 to produce a structure as shown in FIG.
- the first conductor 13 is positioned so that the columnar body 21 is located inside the first dielectric 12.
- the second conductor 14 can be manufactured. Therefore, a highly reliable resonator in which the ⁇ z-direction end of the columnar body 21 is securely bonded to the first conductor 13 and the + z-direction end of the first dielectric 12 is securely bonded to the second conductor 14. Can be easily manufactured.
- the first dielectric 12 has a cylindrical shape. Accordingly, since the first dielectric 12 having a simple shape can surround the columnar body 21 with a space therebetween, the mass productivity is further improved.
- FIG. 5 is a perspective view similar to FIG. 3 schematically showing some of the components of the resonator according to the second embodiment of the present invention.
- parts different from those of the first embodiment described above will be described, and the same constituent elements will be denoted by the same reference numerals and redundant description will be omitted.
- the resonator of this embodiment is different from the resonator of the first embodiment in the shape of the first dielectric 12, and the other configuration is the same as that of the resonator of the first embodiment. is there.
- the first dielectric 12 has a plurality of slits 15. Each slit 15 is formed from the end of the first dielectric 12 in the ⁇ z direction toward the + z direction. Since the resonator of the present embodiment has a plurality of slits 15, it is possible to further suppress a decrease in the resonance frequency of the higher-order mode resonance.
- the shape and number of the slits 15 can be appropriately set according to desired electrical characteristics, but the slits 15 have a long shape in the length direction (+ z direction) of the first dielectric 12. desirable.
- the ratio of the dimension of the slit 15 in the + z direction to the dimension of the first dielectric 12 in the + z direction is preferably 60% or more, and more preferably 80% or more.
- FIG. 6 is a cross-sectional view schematically showing a resonator according to the third embodiment of the present invention.
- 7 is a cross-sectional view taken along line CD of FIG. 8 and 9 are perspective views schematically showing some of the components of the resonator according to the third embodiment of the present invention.
- parts different from those of the first embodiment described above will be described, and similar constituent elements will be denoted by the same reference numerals, and redundant description will be omitted.
- the columnar body 21 is made of a dielectric, and all other structures are the same as those of the first embodiment described above.
- a known dielectric material 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 resonator of the present embodiment having such a configuration functions as a resonator having a resonance mode similar to the TM mode because the columnar body 21 is formed of a dielectric. That is, it functions almost the same as a TM mode resonator.
- the resonance frequency is lowered when a gap is generated between both end faces of the columnar dielectric and the inner surface of the shield case. It was necessary to join both end faces of the columnar dielectric without gaps. For this reason, it is difficult to manufacture, and it is difficult to confirm the bonding state, and it is difficult to manufacture with a high yield.
- the columnar dielectric in order to facilitate the manufacture, if only one end face of the columnar dielectric is designed to be joined to the shield case, the columnar dielectric must be increased in volume to reduce the resonance frequency. In this case, there is a problem that the resonator becomes larger and the resonance frequency of the higher-order mode resonance is lowered to be close to the resonance frequency of the fundamental mode resonance and the electrical characteristics are deteriorated.
- the resonator according to the present embodiment having the above-described configuration includes the first dielectric 12 that surrounds the columnar body 21 with an interval from the columnar body 21, so that the decrease in the resonance frequency of the higher-order mode resonance is reduced. While suppressing, the resonance frequency of the fundamental mode resonance can be lowered.
- the resonator according to the present embodiment has such a configuration, for example, the end of the columnar body 21 in the ⁇ z direction is joined to the first conductor 13 and the first dielectric 12 has the + z direction. After the ends of the first conductor 13 and the second conductor 14 are joined, the first conductor 13 and the second conductor 14 can be joined. Therefore, a resonator in which the end of the columnar body 21 in the ⁇ z direction is securely bonded to the first conductor 13 and the end of the first dielectric 12 in the + z direction is securely bonded to the second conductor 14 can be easily obtained with high yield. Can be manufactured.
- the first dielectric 12 has a cylindrical shape. Accordingly, since the first dielectric 12 having a simple shape can surround the columnar body 21 with a space therebetween, the mass productivity is further improved.
- FIG. 10 is a perspective view similar to FIG. 8 schematically showing some of the components of the resonator according to the fourth embodiment of the present invention.
- parts different from the above-described third embodiment will be described, and the same constituent elements will be denoted by the same reference numerals and redundant description will be omitted.
- the resonator of the present embodiment is different from the resonator of the third embodiment in the shape of the first dielectric 12, and the other configuration is the same as that of the resonator of the third embodiment. is there.
- the first dielectric 12 has a plurality of slits 15. Each slit 15 is formed from the end of the first dielectric 12 in the ⁇ z direction toward the + z direction. Since the resonator of the present embodiment has a plurality of slits 15, it is possible to further suppress a decrease in the resonance frequency of the higher-order mode resonance.
- the shape and number of the slits 15 can be appropriately set according to desired electrical characteristics, but the slits 15 have a long shape in the length direction (+ z direction) of the first dielectric 12. desirable.
- the ratio of the dimension of the slit 15 in the + z direction to the dimension of the first dielectric 12 in the + z direction is preferably 60% or more, and more preferably 80% or more.
- FIG. 11 is a cross-sectional view schematically showing a resonator according to the fifth embodiment of the present invention.
- 12 is a cross-sectional view taken along the line EF of FIG.
- parts different from the above-described third embodiment will be described, and the same constituent elements will be denoted by the same reference numerals and redundant description will be omitted.
- the first conductor 13 has a protruding portion 13p.
- the protrusion 13p protrudes in the + z direction, and the end of the columnar body 21 in the ⁇ z direction is joined to the end of the protrusion 13p in the + z direction.
- the length of the columnar body 21 in the + z direction is shortened by the length of the protruding portion 13p in the + z direction.
- Other configurations are the same as those of the resonator according to the third embodiment.
- the end in the + z direction of the protrusion 13p is located on the + z direction side of the ⁇ z direction end of the first dielectric 12. That is, the + z-direction end of the protrusion 13 p is located inside the first dielectric 12. Therefore, the entire columnar body 21 is located inside the first dielectric 12.
- the first conductor 13 has the protruding portion 13p protruding in the + z direction, and the end of the protruding portion 13p in the + z direction is the ⁇ z direction of the first dielectric 12.
- the ⁇ z direction end of the columnar body 21 is joined to the + z direction end of the protruding portion 13p.
- the planar shape of the protruding portion 13p (the shape when viewed in plan from the + z direction) may be any shape as long as it fits inside the first dielectric 12. However, when the planar shape of the protruding portion 13p is the same as the planar shape of the columnar body 21 (the shape when viewed in plan from the + z direction), the loss of the resonator can be minimized.
- FIG. 13 is a cross-sectional view schematically showing a filter according to a sixth embodiment of the present invention.
- parts different from those of the first embodiment described above will be described, and similar constituent elements will be denoted by the same reference numerals, and redundant description will be omitted.
- the filter of the present embodiment has a first resonator 20a, a second resonator 20b, a first terminal electrode 18a, and a second terminal electrode 18b.
- the first resonator 20a includes a columnar body 21a, a first dielectric 12a, and a shield conductor 10a.
- the shield conductor 10a has a cavity 19a and is composed of a first conductor 13a and a second conductor 14a.
- the first conductor 13a has a through hole 16a and a through hole 17a.
- the shield conductor 10a is connected to a reference potential (referred to as a ground potential or an earth potential).
- the second resonator 20b includes a columnar body 21b, a first dielectric body 12b, and a shield conductor 10b.
- the shield conductor 10b has a cavity 19b and is composed of a first conductor 13b and a second conductor 14b.
- the first conductor 13b has a through hole 16b and a through hole 17b.
- the shield conductor 10b is connected to a reference potential (referred to as a ground potential or an earth potential).
- the columnar body 21a and the columnar body 21b are the same as the columnar body 21 of the first embodiment.
- the first dielectric 12a and the first dielectric 12b are the same as the first dielectric 12 of the first embodiment.
- the first conductor 13a and the first conductor 13b are the same as the first conductor 13 of the first embodiment.
- the second conductor 14a and the second conductor 14b are the same as the second conductor 14 of the first embodiment.
- the cavity 19a and the cavity 19b are the same as the cavity 19 of the first embodiment.
- the through-hole 16a and the through-hole 16b are the same as the through-hole 16 of 1st Embodiment, and the through-hole 17a and the through-hole 17b are the same as the through-hole 17 of 1st Embodiment. That is, the first resonator 20a and the second resonator 20b are the same as the resonator of the first embodiment.
- the first resonator 20a and the second resonator 20b are arranged side by side so as to form a row. Moreover, the 1st conductor 13a and the 1st conductor 13b are joined by the electroconductive joining member, and the 2nd conductor 14a and the 2nd conductor 14b are joined by the electroconductive joining member.
- the first resonator 20a and the second resonator 20b are disposed so that the through hole 17a and the through hole 16b are connected to each other, and are electromagnetically coupled to each other through the through hole 17a and the through hole 16b.
- the first terminal electrode 18a has a rod shape bent in an L shape, and is inserted into the cavity 19a of the first resonator 20a through the through hole 16a. One end of the first terminal electrode 18a is located outside the first resonator 20a, and the other end of the first terminal electrode 18a is joined to the first conductor 13a in the cavity 19a.
- the first terminal electrode 18a has a portion extending in the + z direction, and is electromagnetically connected (electromagnetically coupled) to the first resonator 20a.
- the second terminal electrode 18b has a rod shape bent in an L shape, and is inserted into the cavity 19b of the second resonator 20b through the through hole 17b. One end of the second terminal electrode 18b is located outside the second resonator 20b, and the other end of the second terminal electrode 18b is joined to the first conductor 13b in the cavity 19b.
- the second terminal electrode 18b has a portion extending in the + z direction, and is electromagnetically connected (electromagnetically coupled) to the second resonator 20b.
- the first terminal electrode 18a and the second terminal electrode 18b can be formed using various known conductive materials such as metals and non-metallic conductive materials.
- a conductive material mainly composed of an Ag alloy such as Ag, Ag—Pd, or Ag—Pt, or a Cu-based, W-based, Mo-based, or Pd-based conductive material is used. It is desirable.
- the filter of the present embodiment has a plurality of resonators (first resonator 20a and second resonator 20b), the first terminal electrode 18a, and the second terminal electrode 18b.
- Each of the first resonator 20a and the second resonator 20b has the same structure as the resonator of the first embodiment.
- the first resonator 20a and the second resonator 20b are arranged in a row so as to be electromagnetically coupled.
- the first resonator 20a is located at one end of the row, and the second resonator 20b is located at the other end of the row.
- the first terminal electrode 18a is electrically or electromagnetically connected to the first resonator 20a
- the second terminal electrode 18b is electrically or electromagnetically connected to the second resonator 20b. Since it has such a configuration, the filter of this embodiment can be downsized, and can realize excellent characteristics in which the insertion loss in the passband is small and the attenuation near the passband is large.
- FIG. 14 is a block diagram schematically showing a communication device according to the seventh embodiment of this invention.
- the communication apparatus according to the present embodiment includes an antenna 82, a communication circuit 81, and a filter 80 connected to the antenna 82 and the communication circuit 81.
- the filter 80 is the filter of the sixth embodiment described above.
- the antenna 82 and the communication circuit 81 are well-known conventional ones.
- the communication device according to the present embodiment having such a configuration can be reduced in size because the unnecessary electric signal is removed using the filter of the sixth embodiment that is small and has excellent electrical characteristics, and communication quality is improved. Can be better.
- the columnar body 21 has a columnar shape
- the columnar body 21 may have another shape such as a quadrangular columnar shape, a hexagonal columnar shape, or an elliptical columnar shape.
- the columnar body 21 may have a shape with a non-constant cross-sectional area.
- the present invention is not limited to this.
- the slit 15 shown in FIG. 5 may penetrate the first dielectric 12 in the + z direction, and the first dielectric 12 may be divided into four. That is, the plurality of first dielectric bodies 12 may be provided, and the plurality of first dielectric bodies 12 may be disposed so as to surround the columnar body 21.
- the first resonator 20a and the second resonator 20b have the same structure as the resonator of the first embodiment, but the present invention is not limited to this.
- the resonator may have the same structure as that of any one of the second to fifth embodiments, or may have another structure.
- the filter has two resonators (the first resonator 20a and the second resonator 20b) has been described, but the present invention is not limited to this.
- the filter may have three or more resonators. In that case, other resonators may be arranged between the first resonator 20a and the second resonator 20b so that all the resonators form a line.
- the filter 80 is the filter of the sixth embodiment described above, but the present invention is not limited to this. Other filters having similar characteristics may be used.
- the electrical characteristics of the resonator according to the first embodiment shown in FIGS. 1 to 4 were calculated by simulation.
- the dielectric constituting the first dielectric 12 has a relative dielectric constant of 43 and a dielectric loss tangent of 2 ⁇ 10 ⁇ 4 .
- the electrical conductivity of the first conductor 13, the second conductor 14, and the columnar body 21 was 4.2 ⁇ 10 7 S / m.
- the dimension in the + x direction and the dimension in the + y direction of the cavity 19 were 51 mm, and the dimension in the + z direction of the cavity 19 was 39 mm.
- the diameter of the columnar body 21 was 12 mm, and the length of the columnar body 21 (the dimension in the + z direction) was 37 mm.
- the inner diameter of the first dielectric 12 was 16 mm, the outer diameter of the first dielectric 12 was 18 mm, and the length (the dimension in the + z direction) of the first dielectric 12 was 37 mm.
- the resonance frequency of the fundamental mode resonance was 757 MHz
- the Q value of the fundamental mode resonance was 4611
- the resonance frequency of the highest order mode resonance having the lowest frequency was 3.47 GHz.
- a resonator of a comparative example having a structure similar to that shown in FIGS. 1 to 4 except that the first dielectric 12 is removed (the through hole 16 and the through hole 17 are omitted).
- the electrical characteristics of the / 4 wavelength semi-coaxial resonator were calculated by simulation.
- a cavity inside the shield case corresponding to the shield conductor 10 of FIGS. 1 to 4 (corresponding to the cavity 19 of FIGS. 1 to 4) has a dimension in the + x direction and a dimension in the + y direction of 60 mm, and a dimension in the + z direction. 44 mm.
- 1 to 4 has a diameter of 25 mm and a thickness (+ z direction) at a + z direction end of a cylinder having a diameter of 16 mm and a length (+ z direction dimension) of 40 mm.
- the dimension was a shape in which discs of 2 mm were joined, and the end in the -z direction was joined to the shield case and grounded.
- the physical properties of the conductors constituting the shield case and the internal conductor were the same as in the previous simulation (simulation of the resonator of the first embodiment).
- the resonance frequency of the fundamental mode resonance was 749 MHz
- the Q value of the fundamental mode resonance was 4616
- the resonance frequency of the highest order mode resonance having the lowest frequency was 3.66 GHz.
- the resonator of the first embodiment can realize excellent electrical characteristics equivalent to those of the resonator of the comparative example, although it is smaller than the resonator of the comparative example. .
- the electrical characteristics of the resonator of the third embodiment shown in FIGS. 6 to 9 were calculated by simulation.
- the dielectric constituting the columnar body 21 and the first dielectric 12 has a relative dielectric constant of 43 and a dielectric loss tangent of 1.6 ⁇ 10 ⁇ 4 .
- the conductivity of the first conductor 13 and the second conductor 14 was 4.64 ⁇ 10 7 S / m.
- the dimension in the + x direction and the dimension in the + y direction of the cavity 19 was 9.1 mm, and the dimension in the + z direction of the cavity 19 was 8.2 mm.
- the diameter of the columnar body 21 was 1.6 mm, and the length of the columnar body 21 (the dimension in the + z direction) was 7.7 mm.
- the inner diameter of the first dielectric 12 was 2.6 mm, the outer diameter of the first dielectric 12 was 5.6 mm, and the length (the dimension in the + z direction) of the first dielectric 12 was 7.7 mm.
- the resonance frequency of the fundamental mode resonance was 5.91 GHz
- the Q value of the fundamental mode resonance was 3530
- the resonance frequency of the highest order mode resonance having the lowest frequency was 7.49 GHz.
- the electrical characteristics of the resonator of the fourth embodiment having the four slits 15 shown in FIG. 10 were calculated by simulation.
- the width of the slit 15 was 0.5 mm, and the length of the slit 15 (the dimension in the + z direction) was 6.7 mm. Except for having four slits 15, all were the same as the previous simulation (simulation of the resonator of the third embodiment).
- the resonance frequency of the fundamental mode resonance was 6.12 GHz
- the Q value of the fundamental mode resonance was 3568
- the resonance frequency of the highest order mode resonance having the lowest frequency was 9.04 GHz.
- the resonator of the third embodiment and the resonator of the fourth embodiment are small in size and have a high Q value of the fundamental mode resonance, the resonance frequency of the fundamental mode resonance, and the higher order mode resonance. It was confirmed that excellent electrical characteristics with a large interval from the resonance frequency can be realized.
- 10a, 10b shield conductors 12, 12a, 12b: first dielectrics 13, 13a, 13b: first conductor 13p: protrusions 14, 14a, 14b: second conductor 15: slits 16, 16a, 16b, 17 , 17a, 17b: through-hole 18a: first terminal electrode 18b: second terminal electrode 19, 19a, 19b: cavity 20a: first resonator 20b: second resonators 21, 21a, 21b: columnar body 80: filter 81 : Communication circuit 82: Antenna
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Abstract
Description
図1は、本発明の第1実施形態の共振器を模式的に示す断面図である。図2は、図1のA-B線断面図である。図3および図4は、本発明の第1実施形態の共振器の構成要素の一部を模式的に示す斜視図である。本実施形態の共振器は、図1~図4に示すように、シールド導体10と、柱状体21と、第1誘電体12とを有している。シールド導体10は、第1導体13および第2導体14を有している。
図5は、本発明の第2実施形態の共振器の構成要素の一部を模式的に示す、図3と同様の斜視図である。なお、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。
図6は、本発明の第3実施形態の共振器を模式的に示す断面図である。図7は、図6のC-D線断面図である。図8および図9は、本発明の第3実施形態の共振器の構成要素の一部を模式的に示す斜視図である。なお、本実施形態においては、前述した第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。
図10は、本発明の第4実施形態の共振器の構成要素の一部を模式的に示す、図8と同様の斜視図である。なお、本実施形態においては、上述した第3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。
図11は、本発明の第5実施形態の共振器を模式的に示す断面図である。図12は、図11のE-F線断面図である。なお、本実施形態においては、上述した第3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。
図13は、本発明の第6実施形態のフィルタを模式的に示す断面図である。なお、本実施形態においては、前述した第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。
図14は、本発明の第7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および通信回路81に接続されたフィルタ80とを有している。フィルタ80は、前述した第6実施形態のフィルタである。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。
本発明は、上述した実施形態に限定されるものではなく、本発明の技術思想に則して種々の変更および改良が可能である。
12,12a,12b:第1誘電体
13,13a,13b:第1導体
13p:突出部
14,14a,14b:第2導体
15:スリット
16,16a,16b,17,17a,17b:貫通孔
18a:第1端子電極
18b:第2端子電極
19,19a,19b:空洞
20a:第1共振器
20b:第2共振器
21,21a,21b:柱状体
80:フィルタ
81:通信回路
82:アンテナ
Claims (9)
- 第1方向側に位置する第1導体と、前記第1方向と反対方向である第2方向側に位置する第2導体と、を含んで構成されており、内部に空洞を有する、シールド導体と、
誘電体または導体によって構成されており、柱状の形状を有しており、前記空洞内にあり、前記第1方向の端が前記第1導体に接合されており、前記第2方向の端と前記シールド導体との間に間隔を有している、柱状体と、
前記空洞内にあり、前記第2方向の端が前記第2導体に接合されており、前記第1方向の端と前記シールド導体との間に間隔を有しており、前記柱状体と間隔を開けて該柱状体を取り囲む1つ以上の第1誘電体と、
を有することを特徴とする共振器。 - 前記第1誘電体が筒状の形状を有していることを特徴とする請求項1に記載の共振器。
- 前記第1誘電体が複数のスリットを有していることを特徴とする請求項2に記載の共振器。
- 複数の前記第1誘電体を有しており、該複数の第1誘電体が前記柱状体を取り囲むように配置されていることを特徴とする請求項1に記載の共振器。
- 前記柱状体が導体で構成されていることを特徴とする請求項1乃至請求項4のいずれかに記載の共振器。
- 前記柱状体が誘電体で構成されていることを特徴とする請求項1乃至請求項4のいずれかに記載の共振器。
- 前記第1導体は、前記第2方向へ突出している突出部を有しており、
該突出部の前記第2方向の端は、前記第1誘電体の前記第1方向の端よりも前記第2方向側に位置しており、
前記柱状体の前記第1方向の端は、前記突出部の前記第2方向の端に接合されている
ことを特徴とする請求項6に記載の共振器。 - 各々が請求項1乃至請求項7のいずれかに記載の共振器と同じ構造を有しているとともに、相互に電磁気的に結合するように列を成して配置されており、該列の一方端に位置する第1共振器および前記列の他方端に位置する第2共振器を含む、複数の共振器と、
電気的または電磁気的に前記第1共振器に接続される第1端子電極と、
電気的または電磁気的に前記第2共振器に接続される第2端子電極と、
を有することを特徴とするフィルタ。 - アンテナと、通信回路と、前記アンテナおよび前記通信回路に接続された請求項8に記載のフィルタと、を有していることを特徴とする通信装置。
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