JP2005159597A - Resonator apparatus, filter, duplexer, and communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resonator which is made drasticlly smaller in size and lighter in weight than that adopting a semi-coaxial resonator or a cavity resonator by multiplexing a plurality of resonance modes by using a dielectric core, and to provide a filter, a duplexer, and a communication apparatus using them. <P>SOLUTION: The resonator is provided with the cylindrical dielectric core 3 having a through-hole 2 penetrated between two first and second end faces facing with each other nearly in parallel, and a center rod conductor 4 the lower end of which is conductive to a cavity 1 and inserted through the through-hole 2 of the dielectric core 3. The dielectric core 3 generates a TE01δx+y mode wherein an electric field vector is rotated within a plane orthogonal to an x+y axis, a TE01δx-y mode wherein an electric field vector is rotated within a plane orthogonal to an x-y axis, a TE01z mode wherein an electric field vector is rotated within a plane orthogonal to a z axis, and further the center conductor 4 and the cavity 1 generate a quasi TEM mode to allow the resonator to act like a quadruple mode resonator. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a resonator device in which a plurality of resonance modes are multiplexed, a filter, a duplexer, and a communication device including them.

  Conventionally, cavity resonators and semi-coaxial resonators have been used as resonator devices that handle relatively high power in the microwave band. Since the semi-coaxial resonator has a relatively high Q and is smaller than the cavity resonator, it is effective for downsizing when a filter or the like is formed.

The applicant of the present application has applied for a resonator device in which a dielectric core and a central conductor are provided in a conductive cavity to multiplex resonance modes (see Patent Document 1).
JP 2001-177313 A

  However, in a cellular mobile communication system such as a mobile phone, for example, a filter provided in a base station is increasingly required to be miniaturized as a result of the microcellization.

  The device disclosed in Patent Document 1 has an excellent feature that the size of the entire filter can be reduced when the number of resonators is increased as compared with those using only the semi-coaxial resonator and the cavity resonator. ing.

  An object of the present invention is to provide a resonator, a filter, and a duplexer that can be easily miniaturized by multiplexing a plurality of resonance modes different from the resonator device based on multiplexing of a plurality of resonance modes shown in Patent Document 1. And providing a communication apparatus using them.

  According to another aspect of the present invention, there is provided a resonator device having a cylindrical dielectric core having a through-hole penetrating between two first and second end faces facing substantially parallel to each other, and a conductive dielectric core. A cavity for accommodating the core, the first end surface of the dielectric core is in contact with the inner surface of the cavity, and the inner diameter of the through hole of the dielectric core is larger on the second end surface side than on the first end surface side. It is characterized by that.

  According to another aspect of the present invention, there is provided a resonator device having a cylindrical dielectric core having a through-hole penetrating between two first and second end faces opposed substantially in parallel, and having conductivity. A cavity for accommodating the dielectric core, the first end surface of the dielectric core is in contact with the inner surface of the cavity, and the outer diameter of the dielectric core is larger on the second end surface side than on the first end surface side. It is characterized by that.

  According to another aspect of the present invention, there is provided a resonator device having a cylindrical dielectric core having a through-hole penetrating between two first and second end faces opposed substantially in parallel, and having conductivity. A cavity for accommodating the dielectric core, the first end surface of the dielectric core is in contact with the inner surface of the cavity, and the inner diameter of the through hole of the dielectric core is in the penetration direction of the through hole of the dielectric core. It is characterized in that it is smaller than the first end face side at a substantially central portion.

  According to another aspect of the present invention, there is provided a resonator device having a cylindrical dielectric core having a through-hole penetrating between two first and second end faces opposed substantially in parallel, and having conductivity. A cavity that accommodates the dielectric core, the first end surface of the dielectric core being in contact with the inner surface of the cavity, and the outer diameter of the dielectric core being substantially the center of the cavity in the through direction of the through hole of the dielectric core It is characterized in that the portion is larger than the first end face side.

  In the resonator device according to the present invention, the cavity and the dielectric core may be configured so that the through-hole direction of the through hole of the dielectric core is taken as the z-axis, and two axes perpendicular to the z-axis and perpendicular to each other are taken as the x-axis. And the TE01δx + y mode in which the electric field vector rotates in a plane orthogonal to the (x + y) axis, the TE01δx-y mode in which the electric field vector rotates in a plane orthogonal to the (xy) axis, and the z axis The TE01δz mode in which the electric field vector rotates in the plane is generated, and the region of the dielectric core where the main electric field vector of the TE01δx + y mode or TE01δx-y mode rotates and the region where the main electric field vector of the TE01δz mode rotates overlaps the dielectric core. An asymmetric part is provided to combine the TE01δx + y mode or the TE01δx-y mode with the TE01δz mode. There.

  The resonator device according to the present invention is characterized in that at least one end is connected to the cavity, and a rod-shaped central conductor inserted into the through hole of the dielectric core is provided in the cavity.

  In the resonator device according to the present invention, the cavity and the dielectric core may be configured so that the through-hole direction of the through hole of the dielectric core is taken as the z-axis, and two axes perpendicular to the z-axis and perpendicular to each other are taken as the x-axis. And the TE01δx + y mode in which the electric field vector rotates in a plane orthogonal to the (x + y) axis, the TE01δx-y mode in which the electric field vector rotates in a plane orthogonal to the (xy) axis, and the z axis A TE01δz mode in which an electric field vector rotates in a plane is generated, and a quasi-TEM mode is generated by the cavity and the central conductor. The position of the center conductor relative to the cavity, the position of the dielectric core, or induction so as to deviate the intensity distribution of the main electric field vector in the TEM mode. The shape of the electric core is determined, and the TE01δx + y mode or the TE01δx-y mode is combined with the quasi-TEM mode.

  According to another aspect of the present invention, there is provided a filter comprising: the resonator device according to any one of the above, and an external coupling unit coupled to the resonator device.

  The duplexer of the present invention is provided with two sets of the filters, one input / output port of the first filter as a transmission signal input port, one input / output port of the second filter as a reception signal output port, The other input / output port of the first and second filters is a shared antenna port.

  In addition, a communication apparatus according to the present invention is characterized by being provided with the filter or the duplexer.

  According to the present invention, it is possible to multiplex a resonator device in one cavity, and to reduce the overall size when configuring a resonator device that requires a predetermined number of stages and a filter or duplexer including the resonator device. Can be planned.

  In addition, according to the present invention, the dielectric core acts as a triple TE mode resonator in which an electric field rotates on three orthogonal surfaces of the dielectric core. The device can be miniaturized. Furthermore, since the resonance energy is concentrated in the dielectric core, the conductor loss due to the cavity or the like can be reduced, and a resonator device with a high Q and a filter / duplexer with a low insertion loss can be configured.

  Further, according to the present invention, since the four conductors are formed in one cavity by providing the central conductor together with the dielectric core in the cavity, the size can be further reduced.

  Further, according to the present invention, a small, low-loss and high-gain communication device can be easily configured as a whole by using a small and low insertion loss filter or duplexer.

  The configuration of the resonator device according to the first embodiment will be described with reference to FIGS. FIG. 1 is a perspective view of a resonator device. This resonator device is constituted by a cavity 1 and a dielectric core 3. The cavity 1 has a substantially rectangular parallelepiped (hexahedral) shape. However, here, the three-dimensional shape of the inner surface of the cavity is represented by a frame. The dielectric core 3 is disposed substantially at the center of the inner bottom surface of the cavity 1.

FIG. 2 is a longitudinal sectional view passing through the cavity 1 and the center of the dielectric core 3 of the resonator device shown in FIG.
The dielectric core 3 has a first end face in the figure (this first end face is a bottom face in the direction shown in the drawing, and is hereinafter referred to as a “bottom face”) and a second end face (upper face in the direction shown in the figure). , Hereinafter referred to as “upper surface”) has a through hole 2 penetrating between the two end surfaces, and has a cylindrical shape as a whole. The cavity 1 is made of a conductive metal body, and its inner wall surface has a rectangular parallelepiped shape (hexahedral shape).

  As shown in FIG. 2, the inner diameter of the through hole 2 is such that the inner diameter IDa of the bottom surface side Sa is larger than the inner diameter IDb of the upper surface side Sb. The first surface of the dielectric core 3 is in contact with the center of the inner bottom surface of the cavity 1, and the upper surface side Sb of the dielectric core 3 is configured to be positioned at the approximate center in the height direction of the cavity 1.

  This dielectric core is made of an arbitrary dielectric material having a relative dielectric constant εr of about 20 to 130 according to the frequency band used. Specifically, zirconium titanate-tin titanate compound, barium titanate compound, zinc barium tantalate compound, magnesium barium tantalate compound, rare earth aluminate-calcium titanate compound, magnesium titanate-titanium Acid calcium compounds are used.

  FIG. 3 shows three resonance modes used in this resonator. Here, solid arrows indicate electric field vectors, and broken arrows indicate magnetic field vectors. The penetration direction of the through hole 2 of the dielectric core 3 is defined as the z-axis, and the two axes orthogonal to the z-axis and orthogonal to each other are defined as the x-axis and the y-axis. Furthermore, in this example, the x-axis and the y-axis are taken in the direction along the two surfaces of the cavity 1. However, since any of the three resonance modes shown here hardly depends on the shape of the cavity 1, it is not necessary to set the x axis and the y axis in directions along the two surfaces of the cavity 1. Further, the cavity 1 does not have to be a hexahedron shape.

  FIG. 3A shows a resonance mode in which an electric field vector turns in a plane orthogonal to the (x + y) axis direction. Here, the bottom surface of the cavity 1 acts as an electric wall. In this resonance mode, r is the number of peaks of the electric field distribution in the radial direction from the center of the loop around which the electric field vector is rotated, θ is the number of peaks of the electric field distribution in the rotation direction, and the electric field distribution in the direction perpendicular to the plane on which the electric field vector is rotated. When the number of peaks is h, and the coordinate axis in the direction perpendicular to the plane on which the electric field vector rotates is represented by c, the TE01δx + y mode can be said to be referred to as the TEθrhc mode. That is, when considering a plane perpendicular to the x + y axis, no electric field distribution peak occurs in the rotation direction, one electric field distribution peak occurs in the radial direction, and less than one electric field distribution in the direction perpendicular to the surface. A pile of (This value less than 1 is represented by δ). Hereinafter, the TE01δx + y mode is simply referred to as a TEx + y mode.

FIG. 3B shows a resonance mode in which the electric field vector rotates in a plane orthogonal to the (xy) axis direction. Also in this case, the bottom surface of the cavity 1 acts as an electric wall. This resonance mode can be referred to as a TE01δx-y mode. Hereinafter, the TE01δx-y mode is simply referred to as a TEx-y mode.
FIG. 3C shows a resonance mode in which the electric field vector rotates in a plane orthogonal to the z axis. Therefore, this resonance mode can be called a TE01δz mode. Hereinafter, this TE01δz mode is simply referred to as a TEz mode.

  As shown in FIG. 3, the electromagnetic field energy in the TEz mode is concentrated on the center portion of the cavity 1 in the z-axis direction, that is, on the upper portion of the dielectric core 3 away from the inner bottom surface of the cavity 1. On the other hand, in the TEx + y mode and the TEx-y mode, since the loop surface of the electric field vector tilts the dielectric core 3 in the oblique direction, the loop drawn by the electric field vector is larger than that in the TEz mode. Therefore, if the inner diameter and outer diameter of the dielectric core 3 are constant (monotonic) in the z-axis direction, the resonance frequency of the TEz mode is higher than that of the TEx + y mode and the TEx-y mode. Therefore, the inner diameter on the upper surface side is made smaller than the bottom surface side of the dielectric core 3 to relatively increase the resonance frequencies of the TEx + y mode and the TEx-y mode.

In the first embodiment, since the dielectric core 3 has a rotationally symmetric shape with the z axis or an axis parallel to the z axis as the symmetry axis, the directions of the TEx + y mode and the TEx−y mode (loops of their electric field vectors) The direction of the surface) can be taken in countless directions. However, in reality, their orientations are determined by the position of the external coupling means using the TEx + y mode and the TEx−y mode. That is, the TEx + y mode and the TEx−y mode are generated so that the electromagnetic field is distributed at the position where the external coupling means is coupled.
In this way, a resonator device acting as a triple mode resonator is obtained.

Next, a resonator device according to a second embodiment will be described with reference to FIGS.
4A and 4C are perspective views of the resonator device, and FIGS. 4B and 4D are top views thereof. Unlike the resonator device according to the first embodiment shown in FIGS. 1 and 2, in the second embodiment, the outer diameter of the upper surface side Sb is larger than the lower surface side Sa of the dielectric core 3. The inner diameter of the through hole 2 is the same as that in the first embodiment. In this way, by increasing the outer diameter of the top surface Sb from the bottom surface Sa of the dielectric core 3, the resonance frequency of the TEz mode is relatively lowered, and is substantially the same as the resonance frequency of the TEx + y mode and the TEx−y mode. The resonance frequency is obtained.

As shown in FIG. 4, a groove-shaped notch 6 extending in the z-axis direction is formed on a part of the side surface of the upper surface Sb of the dielectric core 3. The notch 6 is formed to extend in the z-axis direction along a plane including the (x + y) axis and the z axis.
FIG. 4E shows the electric field vectors of the even mode and the odd mode, which are coupled modes of the TEz mode and the TEx + y mode. Here, Ee represents an even-mode electric field vector, and Eo represents an odd-mode electric field vector. The notch 6 hardly enters the even mode electric field loop and enters the odd mode electric field loop. For this reason, a difference occurs in the resonance frequency between the even mode and the odd mode, and the TEz mode and the TEx + y mode are coupled.

  FIG. 5 shows the relationship between the length of the groove 6 extending in the groove shape and the coupling coefficient of the two modes (TEz mode and TEx + y mode). In the example shown in FIG. 4, the notch 6 is formed over the entire length of the upper surface side Sb of the dielectric core 3, but when the length of the notch 6 from the upper surface of the dielectric core 3 is changed, the length of the notch 6 is changed. The longer the length, the higher the coupling coefficient between the TEz mode and the TEx + y mode.

FIG. 6 shows another example in which the coupling between the TEz mode and the TEx + y mode is attempted.
Both are top views of the resonator device. In (A), a coupling hole 5 extending in the z-axis direction in a plane including the (x + y) axis and the z-axis is formed in the dielectric core 3. In the example of (B), the shape of the notch 6 shown in FIG. 4 is made planar. In other words, the dielectric core 3 is shaped so that a part of the side surface is chamfered. Even if such a notch or a coupling hole is provided, the TEz mode and the TEx + y mode can be coupled by the same action.

  7 and 8 show a resonator device according to the third embodiment. In the first and second embodiments, the inner diameter of the through hole 2 provided in the dielectric core 3 is changed stepwise between the bottom surface side Sa and the top surface side Sb. This is shown in FIG. In this way, a tapered shape in which the inner diameter is gradually changed according to the position of the z-axis may be used. In addition, the dielectric core 3 is not limited to a cylindrical shape, and may be a rectangular tube shape having a rectangular parallelepiped outer diameter and a through hole 2 extending in the z-axis direction, for example, as shown in FIG. .

  In the example shown in FIGS. 1 and 2, the inner diameter of the through-hole 2 of the dielectric core 3 is changed in two regions on the bottom surface Sa side and the upper surface Sb side. For example, FIG. ), The dielectric core 3 is composed of three regions: a bottom surface side Sa, a top surface side Sb, and a substantially central portion Sc of the cavity in the z-axis direction (through direction of the through hole of the dielectric core). The inner diameter IDc of the second central portion Sc may be smaller than the inner diameter IDa of the bottom surface Sa.

  Similarly, as shown in FIG. 8B, the dielectric core 3 is composed of three regions of a bottom surface side Sa, a top surface side Sb, and a substantially central portion Sc of the cavity in the z-axis direction. The outer diameter ODc may be formed larger than the outer diameter ODa on the bottom side Sa.

Next, a resonator device according to a fourth embodiment will be described with reference to FIGS.
9 is a perspective view of the resonator device, and FIG. 10 is a longitudinal sectional view of the resonator device shown in FIG. The resonator device includes a cavity 1, a central conductor 4 attached to the center of the inner bottom surface of the cavity 1, and a dielectric core 3. The cavity 1 has a substantially rectangular parallelepiped (hexahedral) shape. However, here, the three-dimensional shape of the inner surface of the cavity is represented by a frame. The dielectric core 3 is disposed at the center of the inner bottom surface of the cavity 1, and the central conductor 4 is inserted through the through hole 2. In this example, the through hole 2 of the dielectric core 3 and the central conductor 4 are arranged coaxially.

  As shown in FIG. 10, the inner diameter IDa of the bottom surface Sa of the dielectric core 3 is made larger than the inner diameter IDb of the upper surface Sb, and the outer diameter Oda of the bottom surface Sa is made smaller than the outer diameter ODb of the upper surface Sb.

  FIG. 11 shows four resonance modes used in this resonator device. A solid line arrow schematically represents an electric field vector, and a broken line arrow schematically represents a magnetic field vector. (A) shows a TEx + y mode in which the electric field vector rotates in a plane orthogonal to the (x + y) direction, and (B) shows a TEx-y mode in which the electric field vector rotates in a plane orthogonal to the (xy) direction. (C) shows a TEz mode in which the electric field vector rotates in a plane orthogonal to the z-axis. These three resonance modes are the same as those in the first to third embodiments. FIG. 11D mainly shows a mode of a semi-coaxial resonator including the central conductor 4 and the cavity 1 (hereinafter referred to as a quasi-TEM mode).

In this quasi-TEM mode, the electric field vector is directed in the radial direction from the central conductor to the inner wall surface of the cavity, and the magnetic field vector draws a loop in the circulation direction around the central conductor. Unlike a normal semi-coaxial resonator, this is a quasi-TEM mode in which a dielectric core 3 is loaded.
In this example, the top of the central conductor 4 is open, but both ends thereof may be short-circuited to the inner surface of the cavity 1. The central conductor 4 may be separated from the cavity 1 and fixed to the cavity 1 by screwing or soldering. The central conductor 4 may also be formed by casting or cutting a metal material, or may be formed by forming a conductor film on the surface of ceramic or resin, like the cavity 1.

Next, a resonator device according to a fifth embodiment will be described with reference to FIGS.
FIG. 12 shows a structure when the TEx + y mode and the quasi-TEM mode are coupled. (A) and (C) are perspective views of the resonator device, and (B) and (D) are top views thereof. In this example, the center conductor 4 is displaced in the y-x direction from the center axis of the dielectric core 3 facing the z-axis direction. Therefore, the intensity distribution of the main electric field vector in the quasi-TEM mode is deviated in the y-x direction. Since this deflection direction coincides with the direction of the electric field vector on the upper surface side of the dielectric core 3 in the TEx + y mode, the electric field energy of both modes is transferred and the two modes are coupled.

  FIG. 13 shows the relationship between the Tex + y mode and the quasi-TEM mode coupling coefficient with respect to the deviation amount of the central conductor 4. As the deviation amount of the center conductor 4 is increased in this way, the coupling coefficient of both modes is increased. Therefore, the center conductor 4 may be displaced in the cavity 1 so as to obtain a desired coupling coefficient.

  FIG. 14 shows another structure for coupling the two resonance modes. In the example of (A), the center of the through hole 2 provided in the dielectric core 3 is deviated from the center of the dielectric core 3. With this shape, the distribution of the dielectric portion of the dielectric core 3 existing around the central conductor 4 is deviated, and the electric field distribution of the quasi-TEM mode is deviated in a predetermined direction (in this example, the xy direction). Can be combined with the TEx + y mode.

  In the example shown in FIG. 14B, the positions of the central conductor 4 and the dielectric core 3 with respect to the cavity 1 are deviated in the xy direction. Also in this case, the electric field vector of the quasi-TEM mode is distributed in the radial direction of the inner wall surface of the cavity 1 from the central conductor 4 and deviated in the xy direction, so that the quasi-TEM mode and the Tex + y mode can be combined.

  Thus, the position of the center conductor 4 and the position of the dielectric core 3 with respect to the cavity 1 so as to deviate the intensity distribution of the main electric field vector of the quasi-TEM mode in the plane direction in which the main electric field vector of the TE01δx + y mode of the dielectric core rotates. Alternatively, the shape of the dielectric core 3 is determined, and the TE01δx + y mode and the quasi-TEM mode are coupled.

Although the above example shows the case where the TE01δx + y mode and the quasi-TEM mode are coupled, the same applies to the case where the TE01δx-y mode and the quasi-TEM mode are coupled.
In the examples shown so far, the inner diameter of the through hole 2 of the dielectric core is circular, but it may be elliptical or oval.

  Next, a resonator device according to a sixth embodiment will be described with reference to FIGS. As shown in FIGS. 9 and 10, the resonator device includes a cavity 1, a dielectric core 3, and a central conductor 4. FIGS. 15 to 19 show the relationship between the dimensions of each part of the resonator device, the resonance frequency fo and the no-load Q (Qo) in each mode. However, in these drawings, the quasi-TEM mode is simply expressed as TEM.

  FIG. 15 shows changes in fo and Qo when the height of the dielectric core 3 (core height) is changed. The dimensions of the other parts of the resonator device are as shown in (C). However, referring to FIG. 10, the dimensions inside the dielectric core 3 shown in (C) are IDa = 12 mm, IDb = 5 mm, and SH = 50 mm. The dielectric core 3 is made of a rare earth barium titanate compound having a relative dielectric constant εr = 80.

  As shown in FIG. 15A, the fo in the TEz mode and the quasi-TEM mode decreases as the core height increases, but the fo in the TEx + y mode and the TEx-y mode is substantially constant. Further, as shown in (B), the Qo of the four resonance modes hardly changes even when the core height changes.

  FIG. 16 shows changes in fo and Qo when the diameter (core diameter) of the dielectric core 3 is changed. The dimensions of each part other than the core diameter are as shown in (C). However, referring to FIG. 10, the dimensions inside the dielectric core 3 shown in (C) are IDa = 12 mm, IDb = 5 mm, and SH = 50 mm.

  As shown in FIG. 16A, the fo in the TEx + y mode, the TEx-y mode, and the TEz mode decreases with the same tendency as the core diameter is increased. The fo in the quasi-TEM mode decreases at a lower rate of change. Further, as shown in (B), the Qo of the four resonance modes hardly changes even when the core diameter changes.

  FIG. 17 shows changes in fo and Qo when the dimensions (cavity side dimensions) of the side in the x-axis direction and the side in the y-axis direction of the bottom surface of the cavity 1 are changed. The dimensions of each part other than the cavity side dimensions are as shown in (C). However, referring to FIG. 10, the dimensions inside the dielectric core 3 shown in (C) are IDa = 12 mm, IDb = 5 mm, and SH = 50 mm.

  As shown in FIG. 17A, the fo in the TEx + y mode, the TEx-y mode, and the TEz mode decreases with a substantially similar tendency as the cavity side dimension increases, but the fo in the quasi-TEM mode hardly changes. . Further, as shown in (B), the Qo of the four resonance modes hardly changes even when the cavity side dimension changes.

  FIG. 18 shows changes in fo and Qo when the diameter of the upper surface side of the dielectric core 3 (core upper diameter) is changed. The dimensions of each part other than the core upper diameter are as shown in (C).

  However, referring to FIG. 10, the dimensions inside the dielectric core 3 shown in (C) are IDa = 12 mm, IDb = 5 mm, and SH = 50 mm.

  As shown in FIG. 18A, the fo in the TEz mode greatly decreases as the core upper diameter is made larger than the lower diameter of 32 mm, but the fo in the TEx + y mode and the TEx-y mode hardly change. Further, the fo in the quasi-TEM mode decreases more slowly than the fo in the TEz mode. As shown in (B), the Qo in the quasi-TEM mode increases as the core upper diameter increases. Qo of other resonance modes is substantially constant.

  FIG. 19 shows the relationship between fo and Qo when the height dimension (center conductor height) of the center conductor 4 is changed. Dimensions other than the height of the central conductor are as shown in (C). However, referring to FIG. 10, the dimensions inside the dielectric core 3 shown in (C) are IDa = 12 mm and IDb = 5 mm.

  As shown in FIG. 19A, the fo in the quasi-TEM mode decreases and the fo in other resonance modes hardly changes as the height of the central conductor is increased. Further, as shown in (B), the higher the central conductor height, the slightly lower the Qo of the quasi-TEM mode, and the Qo of the other resonance modes hardly change.

  As shown in FIG. 19A, the center conductor height SH is 43 mm, and the dimensions of the other parts are as shown in FIG. 19C, so that the resonance frequencies of the four resonance modes are substantially matched. It can be used as a quadruple mode resonator device. Further, high Qo can be obtained for the four resonance modes.

  FIG. 20 shows a resonator device according to the seventh embodiment. In each of the embodiments described so far, the outer diameter dimension on the bottom surface side and the outer diameter dimension on the upper surface side of the dielectric core 3 are changed stepwise, but as shown in FIG. You may make it the taper shape from which an outer diameter changes gradually along an axial direction.

  Further, as shown in FIG. 20B, the planar shape of the dielectric core 3 (cross-sectional shape in a plane perpendicular to the z-axis) may be a rectangle.

Next, a filter according to an eighth embodiment will be described with reference to FIG.
21A is a top view of the filter, and FIG. 21B is a front view thereof. However, the cavity 1 having conductivity is illustrated as a frame in order to represent only the shape of the inner surface thereof. The structure and arrangement of the cavity 1, the dielectric core 3 and the central conductor 4 are basically the same as those shown in FIGS. However, on the upper surface side of the dielectric core 3, a groove-shaped cutout portion 6 extending in the z-axis direction along a plane including the (x + y) axis and the z-axis, and along a plane including the (y-x) axis and the z-axis. And a groove-shaped cutout 7 extending in the z-axis direction. Further, the center conductor 4 is displaced in the y-x direction from the center axis of the dielectric core 3 facing the z-axis direction. Coaxial connectors 8 a and 8 b are provided on the outer surface (outside) of the cavity 1. (Actually, the cavity 1 has a thickness, but the thickness is omitted in the figure.) In addition, the probe 10 that conducts to the central conductor of the coaxial connector 8a is projected in the x-axis direction, and the central conductor is formed at the tip of the probe. 4 is provided. The capacitance generated between the tip conductor 11 and the center conductor 4 causes the probe 10 to be electrically coupled to the quasi-TEM mode.

  A coupling loop 9 made of metal is provided between the central conductor of the coaxial connector 8 b and the inner wall surface of the cavity 1. The loop surface of the coupling loop 9 is parallel to a plane including the (x + y) axis and the z axis. Therefore, it couples with the magnetic field of the TEx-y mode in which the electric field vector turns around the plane perpendicular to the (xy) axis direction. In addition, since the magnetic field energy of the quasi-TEM mode is concentrated at the root portion compared to the tip portion of the center conductor 4, the coupling loop 9 provided near the tip portion of the center conductor 4 is almost coupled to the quasi-TEM mode magnetic field. do not do.

  Further, since the notch 6 is provided, the TEx + y mode and the TEz mode are coupled as described above. Similarly, by providing the notch 7 at a position 90 degrees different from the notch 6, the TEx-y mode and the TEz mode are coupled. Further, the Tex + y mode and the quasi-TEM mode are coupled by shifting the center conductor 4 in the (yx) axial direction from the center of the dielectric core 3 (and the center of the cavity 1).

  After all, the coaxial connector 8a (tip conductor 11) → quasi-TEM mode → TEx + y mode → TEz → TEx-y → coaxial connector 8b (coupling loop 9) is sequentially coupled, and four stages of resonators are coupled in order. Become. In this way, it can be used as a filter having a band-pass characteristic provided with a four-stage resonator.

Next, a filter according to a ninth embodiment will be described with reference to FIG.
This filter is configured by arranging two sets of filter units shown in FIG. (A) is a top view thereof, and (B) is a front view thereof. Again, the cavity 1 is shown as a frame. The filter unit 100a is basically the same as that shown in FIG. However, no coaxial connector is attached to the end of the coupling loop 9a. Another filter unit 100b is substantially mirror-symmetric with 100a. The end of the coupling loop 9b is electrically connected to the end of the coupling loop 9a of the filter unit 100a. The end of the probe 10b is connected to the central conductor of the coaxial connector 8b.

  Since the filter units 100a and 100b are each composed of four stages of resonators, the filter shown in 22 acts as a filter having a bandpass characteristic in which eight stages of resonators are sequentially coupled.

  FIG. 23 is a diagram illustrating a configuration of a filter according to the tenth embodiment. (A) is a top view and (B) is a front view. This filter includes filter units 101a, 100a, 100b, and 101b. The filter unit 101a constitutes a semi-coaxial resonator in which a central conductor 12a is provided inside the cavity 1. The center conductor 12a is provided with a coupling loop conductor 13a extending from the center conductor of the coaxial connector 8a and connected to a predetermined position of the center conductor 12a. The coupling loop conductor 13a and the root portion of the central conductor 12a constitute a coupling loop. Further, a probe 10a provided with a tip conductor 11c is disposed near the tip of the center conductor 12a. The tip conductor 11c is electric field coupled to a semi-coaxial resonator formed by the center conductor 12a and the cavity 1. The same applies to the other filter unit 101b. The configuration of the filter units 100a and 100b is the same as that shown in FIG. However, the probe 10a is electrically connected to the probe of the filter unit 100a, and the probe 10b of the filter unit 100b is electrically connected to the probe of the filter unit 101b.

In this way, it acts as a filter showing bandpass characteristics in which 1 + 4 + 4 + 1 = 10 stages of resonators are coupled in order.
In this way, the first and last stage resonators are semi-coaxial resonators, and a strong external coupling is obtained by the coupling loop, so that wideband characteristics can be easily obtained. Further, since the spurious mode due to the quadruple mode resonators of the filter units 100a and 100b is suppressed by the semi-coaxial resonators of the filter units 101a and 101b, the overall spurious characteristics are improved. Further, since it is not necessary to directly couple the quadruple mode resonator to the external circuit, the probe end conductors 11a and 11b of the input / output section can be made small.

Next, the configuration of a communication apparatus will be described as an eleventh embodiment with reference to FIG.
FIG. 24 is a block diagram illustrating a configuration of a duplexer and a communication device including the filter. The transmission filter and the reception filter constitute a duplexer as an antenna duplexer. Then, a transmission circuit is connected to the transmission signal input port of the duplexer, a reception circuit is connected to the reception signal output port, and an antenna is connected to the input / output port of the duplexer, thereby constituting a high-frequency unit of the communication device.

  In this manner, a small duplexer can be configured by providing a large number of resonator stages and including a small filter. In addition, a small and light communication device can be configured by providing a small duplexer.

The figure which shows the structure of the resonator apparatus which concerns on 1st Embodiment. Cross section of the resonator device The figure which shows the electromagnetic field distribution of three resonance modes of the resonator apparatus The figure shown about the coupling | bonding method of two resonance modes in the resonator apparatus which concerns on 2nd Embodiment. The figure which shows the relationship between the groove length of a notch part shown in FIG. 4, and a coupling coefficient Diagram showing another coupling structure The figure which shows the structure of the resonator apparatus which concerns on 3rd Embodiment. Sectional view of a resonator device with yet another structure The figure which shows the structure of the resonator apparatus which concerns on 4th Embodiment. Cross section of the resonator device The figure which shows the electromagnetic field distribution of four resonance modes used with the resonator apparatus The figure which shows the method of the coupling | bonding of two resonance modes which concern on 5th Embodiment The figure which shows the relationship of the coupling coefficient with respect to the center conductor deviation | shift amount shown in FIG. Diagram showing another coupling structure The figure which shows the relationship between the no-load Q and the resonant frequency with respect to the height dimension of the dielectric core of the resonator apparatus which concerns on 6th Embodiment. The figure which shows the relationship between the no-load Q with respect to the diameter of a dielectric core, and the resonance frequency The figure which shows the relationship between the no load Q and the resonance frequency with respect to the cavity side dimension The figure which shows the relationship between the unloaded Q and the resonance frequency with respect to the core upper diameter The figure which shows the relationship between the unloaded Q and the resonance frequency with respect to the height dimension of the center conductor The figure which shows the structure of the resonator apparatus which concerns on 7th Embodiment. The figure which shows the structure of the filter which concerns on 8th Embodiment. The figure which shows the structure of the filter which concerns on 9th Embodiment. The figure which shows the structure of the filter which concerns on 10th Embodiment. The block diagram which shows the structure of the duplexer and communication apparatus which concern on 11th Embodiment

Explanation of symbols

1-cavity 2-through hole 3-dielectric core 4-center conductor 5-coupling hole 6,7-cutout 8-coaxial connector 9-coupling loop 10-probe 11-tip conductor 12-center conductor 13-coupling loop Conductor 100,101-Filter unit Sa-Bottom surface (first end surface) side Sb-Top surface (second end surface) side

Claims (10)

A dielectric core having a cylindrical shape having a through-hole penetrating between two first and second end faces opposed substantially in parallel; and a cavity having conductivity and accommodating the dielectric core. ,
The resonator device according to claim 1, wherein the first end surface of the dielectric core is in contact with the inner surface of the cavity, and the inner diameter of the through hole is larger on the first end surface side than on the second end surface side. A dielectric core having a cylindrical shape having a through-hole penetrating between two first and second end faces opposed substantially in parallel; and a cavity having conductivity and accommodating the dielectric core. ,
The resonator device according to claim 1, wherein the first end face of the dielectric core is in contact with the inner surface of the cavity, and the outer diameter of the dielectric core is larger on the second end face side than on the first end face side. A dielectric core having a cylindrical shape having a through-hole penetrating between two first and second end faces opposed substantially in parallel; and a cavity having conductivity and accommodating the dielectric core. ,
The first end surface of the dielectric core is in contact with the inner surface of the cavity, and the inner diameter of the through hole is the first end surface side at the substantially central portion of the cavity in the through direction of the through hole of the dielectric core. Resonator device characterized in that it is smaller. A dielectric core having a cylindrical shape having a through-hole penetrating between two first and second end faces opposed substantially in parallel; and a cavity having conductivity and accommodating the dielectric core. ,
The first end surface of the dielectric core is in contact with the inner surface of the cavity, and the outer diameter of the dielectric core is set at the first central portion of the cavity in the penetration direction of the through hole of the dielectric core. A resonator device characterized by being larger than an end face side. By the cavity and the dielectric core, the through-hole penetration direction is taken as the z-axis, the two axes perpendicular to the z-axis and perpendicular to each other are taken as the x-axis and y-axis, and the plane perpendicular to the (x + y) axis The TE01δx + y mode in which the electric field vector rotates, the TE01δx-y mode in which the electric field vector rotates in the plane orthogonal to the (xy) axis, and the TE01δz mode in which the electric field vector rotates in the plane orthogonal to the z axis are generated. ,
An asymmetric portion of the dielectric core is provided at a position where a difference occurs in the resonance frequency between the even mode and the odd mode, which is a combination of the TE01δx + y mode or the TE01δx-y mode and the TE01δz mode, and the TE01δx + y mode or the TE01δx-y 5. The resonator device according to claim 1, wherein the mode and the TE01δz mode are coupled.   The resonator according to any one of claims 1 to 5, further comprising: a rod-shaped central conductor, at least one end of which is connected to the cavity, and inserted into a through hole of the dielectric core. apparatus. By the cavity and the dielectric core, the through-hole penetration direction is taken as the z-axis, the two axes perpendicular to the z-axis and perpendicular to each other are taken as the x-axis and y-axis, and the plane perpendicular to the (x + y) axis The TE01δx + y mode in which the electric field vector rotates, the TE01δx-y mode in which the electric field vector rotates in the plane orthogonal to the (xy) axis, and the TE01δz mode in which the electric field vector rotates in the plane orthogonal to the z axis are generated. Generating a quasi-TEM mode by the cavity and the central conductor;
The position of the central conductor with respect to the cavity so as to deviate the intensity distribution of the main electric field vector of the quasi-TEM mode in the plane direction in which the main electric field vector of the TE01δx + y mode or TE01δx-y mode of the dielectric core rotates, the dielectric core The resonator device according to claim 6, wherein the TE01δx + y mode or the TE01δx−y mode and the quasi-TEM mode are coupled by determining the position of the dielectric core or the shape of the dielectric core.   A filter comprising the resonator device according to any one of claims 1 to 7 and an external coupling means coupled to the resonator device.   Two sets of filters according to claim 8 are provided, one input / output port of the first filter is used as a transmission signal input port, one input / output port of the second filter is used as a reception signal output port, and the first and first filters A duplexer in which the other input / output port of the two filters is used as a shared antenna port.   A communication apparatus comprising the filter according to claim 8 or the duplexer according to claim 9.

Images