JP5831805B2 - Coaxial resonator device and manufacturing method thereof - Google Patents

Description

  The present invention relates to a coaxial resonator device such as a coaxial resonance filter and a coaxial resonance duplexer (coaxial resonance duplexer) used in a microwave high-frequency radio communication device or the like, and in particular, a coaxial resonator device having a frequency adjusting screw. And a manufacturing method thereof.

  2. Description of the Related Art Conventionally, in mobile communication devices such as cellular phones, only signals in a desired frequency band are transmitted / received via an antenna by a filter such as a band pass filter. Here, a duplexer (transmission / reception duplexer) can be configured by integrally forming a transmission band-pass filter and a reception band-pass filter. As a resonator device such as a filter and a duplexer, there is a coaxial resonator device in which a plurality of coaxial resonators are arranged so as to obtain a required coupling. As the coaxial resonator device, a cavity filter or a cavity duplexer, a dielectric filter or a dielectric duplexer, or the like is used.

  However, in recent years, there has been a demand for higher performance in mobile communication devices, particularly those for base stations, and accordingly, higher performance has also been required for coaxial resonator devices used in mobile communication devices. For this reason, a coaxial resonator device in which more coaxial resonators are formed has been proposed. In such a coaxial resonator device, it is difficult to appropriately set the frequency balance of each resonator and / or the coupling between the resonators. For this reason, characteristic adjustment such as a frequency adjusting screw or a coupling adjusting screw can be performed. It is necessary to perform delicate characteristic adjustment by a characteristic adjustment method using a screw.

  Japanese Laid-Open Patent Publication No. 10-313202 (Patent Document 1) and Japanese Laid-Open Patent Publication No. 58-56501 (Patent Document 2) disclose a cavity filter and a dielectric having a characteristic adjusting screw such as a frequency adjusting screw or a coupling adjusting screw. A filter is disclosed. In these coaxial resonance filters, a characteristic adjustment screw is screwed into a female screw formed in a filter case that accommodates the coaxial resonator, that is, a casing (including a cover or lid that forms the filter case), and the characteristic adjustment screw for the coaxial resonator is obtained. By adjusting the screwing position, characteristic adjustment such as frequency adjustment or coupling adjustment is performed. In order to fix the screwing position of each characteristic adjustment screw after obtaining good characteristics, a fixing nut is attached to each characteristic adjustment screw.

Japanese Patent Laid-Open No. 10-313202 JP 58-56501 A

  However, in the coaxial resonator devices described in Patent Document 1 and Patent Document 2, since it is necessary to form a female screw for each characteristic adjusting screw in the housing, the shape of the parts becomes complicated and the cost increases. There was a problem. In addition, since it is necessary to increase the thickness of the housing in order to ensure the effective screw length, there is a problem that the weight increases and the raw material cost increases. Furthermore, each characteristic adjustment screw requires a fixing nut for fixing at a predetermined screwing position, which increases the number of parts and increases the cost.

  The present invention has been made in view of the above circumstances, and is a coaxial resonator device provided with a characteristic adjusting screw to meet high performance, and has a simple component shape, a small number of components, and a low-cost coaxial device. An object of the present invention is to provide a resonator device.

According to the present invention, the object as described above is achieved.
A resonator array in which a plurality of coaxial resonators are arranged in parallel to each other in a single dielectric block;
A casing member attached to the resonator array and having a planar portion transverse to the axial direction of the coaxial resonator;
A characteristic adjusting screw adapted to the casing member planar portion so as to protrude from the casing member planar portion toward a coupling electrode coupling the coaxial resonators, and the coupling electrode is the dielectric block A coaxial resonator device formed on the upper surface of
The coaxial resonator according to claim 1, wherein the characteristic adjusting screw is a tapping screw that is screwed into the casing member planar portion when fitted to a pilot hole previously formed in the casing member planar portion. apparatus,
Is provided.

In one aspect of the present invention, the casing member is made of a metal case attached to the dielectric block.

  In one aspect of the present invention, the plate thickness of the casing member planar portion is in the range of 0.2 mm to 2.0 mm.

  In one mode of the present invention, it has a joining member which joins the casing member planar portion and the tapping screw.

In addition, according to the present invention, the object as described above is achieved.
A method of manufacturing the coaxial resonator device, comprising:
Preparing a material in which the pilot hole is formed in advance in the planar portion as a material for the casing member;
Fitting the tapping screw to the casing member surface portion by fitting the tapping screw to the pilot hole; and
Setting the screwing position of the tapping screw into the pilot hole for adjusting the characteristics of the coaxial resonator device;
A method of manufacturing a coaxial resonator device, comprising:
Is provided.

  According to the present invention, since the tapping screw is used as the characteristic adjusting screw, the casing member as the component (material) may be formed with a pilot hole, which is a simple through hole, in advance in its planar portion. For this reason, the component cost in the coaxial resonator device provided with the characteristic adjusting screw can be suppressed.

  Furthermore, according to the present invention, since the tapping screw is used as the characteristic adjusting screw, it is not necessary to previously form a female screw on the casing member planar portion before the characteristic adjusting screw is adapted. Therefore, it is not necessary to make the casing member planar portion thicker than necessary, and the raw material cost in the coaxial resonator device including the characteristic adjusting screw can be kept low.

  Further, according to the present invention, since a tapping screw having a large screwing torque is used as the characteristic adjusting screw, it is difficult to loosen even if the screw is stopped at a predetermined screwing position, and there is no need to provide a fixing nut. Therefore, the number of parts of the coaxial resonator device including the characteristic adjusting screw can be reduced, and the cost can be reduced.

It is a typical exploded perspective view showing a 1st embodiment of a coaxial resonance filter which is a coaxial resonator device by the present invention. It is an expanded sectional view which shows the screwing state of the characteristic adjustment screw with respect to the casing member planar part in embodiment of FIG. It is a typical disassembled perspective view which shows 2nd Embodiment of the coaxial resonance filter which is a coaxial resonator apparatus by this invention. FIG. 4 is a schematic perspective view of the embodiment of FIG. 3. It is an expanded sectional view which shows the screwing state of the characteristic adjustment screw with respect to the casing member planar part in 3rd Embodiment of the coaxial resonance filter which is a coaxial resonator apparatus by this invention. It is an expanded sectional view which shows the screwing state of the characteristic adjustment screw with respect to the casing member planar part in 4th Embodiment of the coaxial resonance filter which is a coaxial resonator apparatus by this invention.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a schematic exploded perspective view showing a first embodiment of a coaxial resonance filter which is a coaxial resonator device according to the present invention. FIG. 2 is an enlarged cross-sectional view showing a screwed state of the characteristic adjusting screw to the casing member planar portion in the present embodiment.

  In FIG. 1, one input / output connector 1 to which an input / output signal is externally connected is provided on an outer wall (end wall) opposite to each other of a metal filter case (metal housing) 32, for convenience, two (1 One is not shown).

  The metal filter case 32 has a box shape having an elongated shape, and its outer dimensions are, for example, a length W = 100 mm, a width L = 20 mm, and a height H = 25 mm. Inside the metal filter case 32, a plurality (five in the figure) of a plurality of (four in the figure) quarter-wavelength coaxial resonators 4 having the H direction as the axial direction are parallel to each other. It is arranged. The arrangement direction of the coaxial resonators 4 is the W direction. Specifically, five resonance bars extend upward from the bottom wall of the metal filter case 32. Thus, by attaching the plurality of coaxial resonators 4 to the common metal filter case 32, a resonator array formed by arranging the plurality of coaxial resonators 4 in parallel with each other is configured.

  A metal cover 31 as a casing member is attached to the metal filter case 32 so as to close the upper open portion. The metal cover 31 has a flat plate shape, and is entirely composed of a planar portion. Specifically, the metal cover 31 is fixed to the metal filter case 32 with screws (not shown) in order to establish electrical continuity with the metal filter case 32. The thickness of the metal cover 31 is, for example, 1 mm. The length of the resonance rod constituting the coaxial resonator 4 is set so that the tip (upper end) thereof is kept at a constant distance from the inner surface (lower surface) of the metal cover 31. Thus, the metal cover 31 as a casing member attached to the resonator array has a planar portion that crosses (preferably orthogonally crosses) the axial direction of the coaxial resonator 4.

  The metal cover 31 is provided with a through-hole 6 having a predetermined size at a portion where the tip of the resonance rod faces, and the through-hole 6 serves as a frequency adjustment screw that is a characteristic adjustment screw of the coaxial resonator device. The tapping screw 5 is screwed. Thus, the tapping screw 5 is adapted to the casing member planar portion so as to protrude from the planar portion of the metal cover 31 as the casing member toward the resonator array. With such a structure, a capacitance is formed between the tip of the resonance rod and the tip of the tapping screw 5. The capacity is changed by adjusting the screwing amount of the tapping screw 5, and the resonance frequency of each coaxial resonator 4 can be adjusted.

  Here, the tapping screw 5 as the characteristic adjusting screw is screwed into the casing member planar portion when adapted to a pilot hole (through hole 6 shown in FIG. 1) formed in advance in the casing member planar portion. Is to be made. That is, for convenience, FIG. 1 shows a state before the tapping screw 5 is fitted to the through hole 6 serving as a pilot hole, and the tapping screw 5 is fitted to the casing member planar portion in FIG. The subsequent screwing state shall be shown. Due to the adaptation of the tapping screw 5, the through-hole 6, which is a pilot hole, is expanded to have a female screw-like inner peripheral surface 6 ′ corresponding to the tapping screw 5.

  The mechanism for screwing the tapping screw 5 will be further described below.

  The tapping screw 5 has a tip portion (a lower end portion in FIGS. 1 and 2) processed into a taper shape. When the tapping screw 5 is screwed into a pilot hole 6 previously formed in the material of the metal cover 31 by screwing, the leading portion of the thread of the tapered portion of the tapping screw 5 becomes the pilot hole 6 of the metallic cover 31. Gradually the female thread part is formed, and the subsequent screw thread bites into the inner peripheral surface of the pilot hole 6 and gradually spreads, and the maximum diameter part of the tip tapered part that becomes the boundary with the parallel thread part The thread is expanded to the size of the thread, and then the thread of the parallel thread part is screwed together.

  As described above, since the tapping screw 5 is screwed in while forming the female screw itself, it is not necessary to previously form the female screw in the metal cover 31. Further, since the female screw is formed by being gradually expanded, it has a minimum size and requires a certain rotational torque even if it is screwed into the parallel screw portion. That is, there is almost no play between the male screw and the female screw, and the screw can be securely fixed at a predetermined screwing position. Accordingly, since it is not necessary to provide a fixing nut, it is possible to reduce the number of parts and the man-hour for fixing the screw.

  As shown in FIG. 2, the tapping screw 5 is difficult to loosen. The metal cover 31 is slightly distorted by being screwed in while the female screw is chopped. It is for giving.

  Such screwing of the tapping screw 5 forms a main part of one embodiment of the method of manufacturing the coaxial resonator device according to the present invention. That is, here, as a material for the metal cover 31 as the casing member, by preparing a material in which the pilot hole 6 is previously formed in the planar portion, and by adapting the tapping screw 5 to the pilot hole 6, A step of screwing the tapping screw 5 into the metal cover 31 which is a casing member planar portion, and a step of setting a screwing position of the tapping screw 5 into the pilot hole 6 for adjusting the characteristics of the coaxial resonator device. Executed.

  In order to maintain a certain rotational torque with the tapping screw 5, it is preferable that the thickness of the metal cover 31 is in a range from 0.2 mm to 2.0 mm.

  As the material for the metal filter case 32 and the metal cover 31, an easily processable and inexpensive material such as aluminum can be used. As a material of the resonance rod, for example, brass can be used.

  In such an embodiment, it is preferable to perform a surface treatment in order to improve the electrical conductivity of the metal member surface. As such a surface treatment, for example, silver plating can be applied to the metal cover 31, the metal filter case 32, and the resonance rod. A general technique can be used as a base treatment for applying silver plating.

[Second Embodiment]
FIG. 3 is a schematic exploded perspective view showing a second embodiment of a coaxial resonance filter which is a coaxial resonator device according to the present invention. FIG. 4 is a schematic perspective view of the embodiment of FIG.

  In the present embodiment, the resonator array is configured by forming a plurality of (five in the figure) quarter-wavelength coaxial resonators 4 in a single dielectric block 33.

  As a material of the dielectric block 33, for example, a ceramic having a relative dielectric constant of about 6 to 25 can be used. The external dimensions of the dielectric block 33 are, for example, a length W = 80 mm, a width L = 18 mm, and a height H = 12 mm.

  More specifically, five through holes are formed from the upper surface to the lower surface of the dielectric block 33, an inner conductor is formed in the through hole, and an outer conductor is formed on the outer surface of the dielectric block 33 excluding the upper surface. . On the upper surface of the dielectric block 33, a coupling electrode 4 'for coupling the coaxial resonators 4 to each other is formed corresponding to each through hole. The coupling electrode 4 ′ is connected to the upper end edge of each inner conductor, whereby the resonance frequency of each coaxial resonator 4 and the coupling with the coaxial resonator adjacent to the coaxial resonator 4 are controlled. Thus, a plurality of coaxial resonators 4 having the H direction as the axial direction are arranged in parallel to each other. The arrangement direction of the coaxial resonators 4 is the W direction. Further, on the upper surface of the dielectric block 33, input / output electrodes 4 ″ are formed which are coupled to the coaxial resonators 4 at both ends of the resonator array. Inner conductor, outer conductor, coupling electrode 4 ′ and input / output electrodes. As the material of 4 ″, for example, silver can be used.

  In this embodiment, the casing member is made of a metal case 31 ′ attached to the dielectric block 33, and the characteristic adjusting screw protrudes from the metal case 31 ′ toward the coupling electrode 4 ′ constituting the coaxial resonator 4. Yes. As the metal case 31 ′, for example, a 0.5 mm metal plate that has been punched and bent by a mold can be used. The metal case 31 ′ has a planar portion that crosses (preferably orthogonally) the axial direction of the coaxial resonator 4 and a peripheral portion that hangs down from the outer peripheral edge of the planar portion. A tapping screw 5 as a frequency adjusting screw, which is a characteristic adjusting screw of the coaxial resonator device, is screwed into the planar portion of the coaxial resonator 4. Thus, the tapping screw 5 is adapted to the casing member planar portion so as to protrude from the planar portion of the metal case 31 ′ as the casing member toward the resonator array. It should be noted that one and two input / output connectors 1 to which input / output signals are externally connected are arranged on the opposite peripheral portions of the metal case 31 '. These input / output connectors 1 are connected to an input / output electrode 4 ″.

  The dielectric block 33 and the metal case 31 ′ are fixed to each other while being electrically connected, for example, by soldering. This joining is performed between the outer conductor of the dielectric block 33 and the peripheral portion of the metal case 31 '. For example, an iron-based material having a thermal expansion coefficient close to that of the dielectric block 33 is preferably used as the material of the metal case 31 '. By using a material having a similar thermal expansion coefficient, it is possible to improve environmental resistance, particularly durability against a thermal shock test. For example, tin plating can be applied to improve solder wettability and durability (corrosion) of iron-based materials. The surface treatment for applying tin plating to iron-based materials is common.

  Here, the tapping screw 5 as the characteristic adjusting screw is screwed into the casing member planar portion when adapted to a pilot hole (through hole 6 shown in FIG. 3) formed in advance in the casing member planar portion. Is to be made. That is, as in the first embodiment, for the sake of convenience, FIG. 3 shows a state before the tapping screw 5 is fitted to the through hole 6 serving as a pilot hole. FIG. 4 shows a screwed state after the tapping screw 5 is fitted to the casing member planar portion. The mechanism for screwing the tapping screw 5 is the same as that described in the first embodiment.

  In the present embodiment, the through hole 6 is formed in the planar portion of the metal case 31 ′ at a position facing the coupling electrode 4 ′ formed on the upper surface of the dielectric block 33. With such a structure, a capacitance is formed between the coupling electrode 4 ′ and the tip of the tapping screw 5. This capacity changes by adjusting the screwing amount of the tapping screw 5, whereby the resonance frequency of each coaxial resonator 4 can be adjusted.

  When tapping screw 5 is rotated, two female threads are engraved by the screw thread contacting the inner peripheral surface of pilot hole 6 and can be tightened with a small thrust along the engraved female thread. It is. Since it is not necessary to process the internal thread in the prepared hole 6 of the metal case 31 ', it is possible to contribute to the reduction of the processing cost of the metal case 31'. Since the tapping screw is screwed in while the female screw is cut, a certain torque is required for screwing. Therefore, it is less likely to loosen than when a general male screw is screwed into a metal case that has been previously processed with a female screw. From this, it is possible to omit the nut for fixing the characteristic adjusting screw after the frequency adjustment is completed, reduce the component factor, and reduce the man-hour for fixing the screw.

[Third Embodiment]
FIG. 5 is an enlarged cross-sectional view showing a state in which a characteristic adjusting screw is screwed to a casing member planar portion in a third embodiment of a coaxial resonance filter which is a coaxial resonator device according to the present invention.

  This embodiment is the same as the first embodiment except that the metal cover 31 and the tapping screw 5 are joined by the joining member 8 after the tapping screw 5 is screwed. As the joining member 8, solder, an epoxy adhesive, a silicone adhesive, an anaerobic adhesive, a thermosetting resin, or the like can be used.

  The joining member 8 can be applied without applying a rotating force to the tapping screw 5 using a dispenser or the like. On the other hand, in the case of screw fixing with a conventional fixing nut, a man-hour for previously screwing the fixing nut into the male screw is required. Also, when fixing screws with conventional fixing nuts, tighten the fixing nut while fixing the male screw with a screwdriver or the like so that the male screw does not turn when the fixing nut is tightened when fixing the male screw after adjusting the frequency. It is necessary and takes man-hours.

  Thus, according to the present embodiment, the number of steps for fixing the tapping screw is reduced as compared with the fixing of the tapping screw using the conventional fixing nut.

  By using the joining member 8 as in this embodiment, the joining between the tapping screw 5 and the metal cover 31 becomes stronger, and the screw is less likely to loosen.

[Fourth Embodiment]
FIG. 6 is an enlarged cross-sectional view showing a state in which the characteristic adjusting screw is screwed to the casing member planar portion in the fourth embodiment of the coaxial resonance filter which is the coaxial resonator device according to the present invention.
This embodiment is the same as the first embodiment except that the pilot hole 6 formed in advance in the metal cover 31 is a burring hole.

  By using a burring hole as the pilot hole 6 previously formed in the metal cover 31, the tapping screw 5 can be easily screwed in a direction perpendicular to the metal cover 31, that is, in the axial direction of the coaxial resonator 4. . In addition, since the burring hole is formed, the joint surface in contact with the thread of the tapping screw 5 is increased. Therefore, even when a thin plate is used as the metal cover 31, the fixing torque due to the frictional force increases, Looseness can be prevented.

  In the above embodiments, the coaxial resonator device is a coaxial resonance filter, but the present invention can also be applied to a case where the coaxial resonator device is a duplexer. Further, the material, shape and size of each part and each member, the number of coaxial resonators, and the like are not limited to those of the above embodiment. In particular, for the tapping screw 5, for example, an iron-based material is preferably used, but the material is not limited as long as it has conductivity. The surface treatment such as plating is not limited as long as it is conductive. The diameter of the tapping screw, the thread pitch, and the thread shape are not limited.

DESCRIPTION OF SYMBOLS 1 Input / output connector 4 Coaxial resonator 4 'Coupling electrode 4 "Input / output electrode 5 Tapping screw 6 Pilot hole 6' Female thread-like inner peripheral surface 8 Joining member 31 Metal cover 31 'Metal case 32 Metal filter case 33 Dielectric block

Claims (5)

A resonator array in which a plurality of coaxial resonators are arranged in parallel to each other in a single dielectric block;
A casing member attached to the resonator array and having a planar portion transverse to the axial direction of the coaxial resonator;
A characteristic adjusting screw adapted to the casing member planar portion so as to protrude from the casing member planar portion toward a coupling electrode coupling the coaxial resonators, and the coupling electrode is the dielectric block A coaxial resonator device formed on the upper surface of
The coaxial resonator according to claim 1, wherein the characteristic adjusting screw is a tapping screw that is screwed into the casing member planar portion when fitted to a pilot hole previously formed in the casing member planar portion. apparatus.   The coaxial resonator device according to claim 1, wherein the casing member is made of a metal case attached to the dielectric block.   3. The coaxial resonator device according to claim 1, wherein a plate thickness of the casing member planar portion is in a range of 0.2 mm to 2.0 mm.   The coaxial resonator device according to any one of claims 1 to 3, further comprising a joining member that joins the casing member planar portion and the tapping screw. A method of manufacturing a coaxial resonator device according to any one of claims 1 to 4,
Preparing a material in which the pilot hole is formed in advance in the planar portion as a material for the casing member;
Fitting the tapping screw to the casing member surface portion by fitting the tapping screw to the pilot hole; and
Setting the screwing position of the tapping screw into the pilot hole for adjusting the characteristics of the coaxial resonator device;
A method for manufacturing a coaxial resonator device, comprising:

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