JP2004349981A - Resonator device, filter, compound filter device, and communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute a quadruple or more multi-mode resonator by easily equalizing a resonance frequency in the multiple mode resonance of a dielectric resonator and a frequency in the quasi-TEM mode of a semi-coaxial resonator. <P>SOLUTION: A dielectric core 3 is arranged in a cavity (a cavity body 1 and a cavity cover 2) having conductivity, together with a center conductor 4 having one end made conductive to the cavity. This resonator is caused to function as a multi-mode dielectric resonator of a TM mode and a TE mode by the dielectric core 3 and is caused to function as a TEM-mode resonator by the center conductor 4 and the cavity. Dimensions from the side surface of the center conductor 4 to the inside surface opposed to it of the cavity, in a cavity conductive end side 41 of the center conductor are made shorter than those in an open end side 42. Thus the resonance frequency in the TEM mode is equalized to that in the TM mode and the TE mode. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a resonator device in which a plurality of resonance modes are multiplexed, a filter having the configuration, a composite filter device, and a communication device including the same.
[0002]
[Prior art]
Conventionally, a multi-mode resonator device combining a semi-coaxial resonator and a dielectric resonator has been disclosed (see Patent Document 1). The resonator device disclosed in Patent Literature 1 combines a dielectric resonator having a duplexed TM mode with a semi-coaxial resonator that resonates in a quasi-TEM mode to form a triple mode resonator device. I have. Also, a dual mode resonator device is configured by combining a dielectric resonator that resonates in the TM mode and a semi-coaxial resonator that resonates in the quasi-TEM mode. FIG. 23 is an exploded perspective view of the resonator device disclosed in Patent Document 1. A cavity is constituted by a cavity body 1 having an upper surface opened and a lower surface closed, and a cavity lid 2 covering the opening surface. At the center of the inner bottom surface of the cavity body 1, a central conductor 4 is projected in a direction parallel to the inner wall surface of each cavity. A dielectric core 3 having a substantially rectangular parallelepiped shape and having a hole through which the conductor rod 4 is inserted is disposed in the cavity.
[0003]
[Patent Document 1]
JP 2001-177313 A
[0004]
[Problems to be solved by the invention]
The structure of the resonator device disclosed in Patent Document 1 has a problem that it is difficult to match the resonance frequencies of the dielectric resonator and the semi-coaxial resonator. For example, when an attempt is made to configure a resonator device of a quadruple mode or more, a dielectric resonator that resonates in a multiplex mode of a triple or more combination of a TE mode and a TM mode is combined with a semi-coaxial resonator. In order to make the frequencies of the TE mode and the TM mode of this dielectric resonator uniform, it is necessary to increase the thickness of the dielectric core. However, since the cavity including the dielectric core therein is also the cavity of the semi-coaxial resonator, if the thickness of the dielectric core is increased, the resonance frequency of the semi-coaxial resonator also decreases. Therefore, it is difficult to make the resonance mode of the semi-coaxial resonator equal to the resonance frequencies of the TE mode and the TM mode only by determining the thickness of the dielectric core.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a resonator provided with a resonator of four or more modes so that the resonance frequency of the multimode of the dielectric resonator and the frequency of the quasi-TEM mode of the semi-coaxial resonator can be easily matched. It is to provide a device.
[0006]
[Means for Solving the Problems]
The resonator device of the present invention is a resonator device in which a dielectric core is provided in a conductive cavity together with a center conductor having one end connected to the cavity, wherein the center conductor has a rod shape or a column shape having side surfaces, The dimension from the side surface of the central conductor to the inner surface of the cavity opposed thereto is such that the conductive end side to the cavity is smaller than the open end side of the central conductor.
By this structure, the resonance frequency of the semi-coaxial resonator is increased without affecting the resonance of the dielectric resonator, and the frequency of the quasi-TEM mode is changed to the frequency of the TE mode or TM mode of the dielectric resonator. Align with
[0007]
Further, the resonator device of the present invention is characterized in that the size of the cross section in the direction perpendicular to the longitudinal direction of the center conductor is made larger on the conductive end side to the cavity than on the open end side of the center conductor. Features. With this structure, the frequency of the quasi-TEM mode of the semi-coaxial resonator is increased only by changing the shape of the center conductor without changing the inner dimensions of the cavity.
[0008]
Further, in the resonator device of the present invention, the inner dimension of the cavity may be smaller at a portion facing a side surface at a conduction end side to the cavity than at a portion facing a side surface at an open end side of the center conductor. It is characterized by. With this structure, the frequency of the quasi-TEM mode of the semi-coaxial resonator is increased only by changing the shape in the cavity without changing the shape of the center conductor.
[0009]
In the resonator device of the present invention, the dielectric core may be provided with a hole through which the center conductor is inserted, and the dielectric core may be arranged in the cavity with the center conductor inserted through the hole. It is characterized by. With this structure, the dielectric core is arranged at the center of the cavity without interfering with the center conductor, and the dielectric core and the cavity act as a dielectric resonator.
[0010]
Further, the resonator device of the present invention resonates a semi-coaxial resonator composed of a cavity and a center conductor in a quasi-TEM mode, and resonates a dielectric resonator composed of a cavity and a dielectric core in at least a TM01δ mode. It is characterized in that a plurality of resonance modes including a quasi-TEM mode are coupled to function as a multistage resonator. With this structure, a resonator device including a resonator having many stages in one cavity is configured.
[0011]
Also, the resonator device of the present invention resonates a semi-coaxial resonator including a cavity and a center conductor in a quasi-TEM mode, and resonates a dielectric resonator including a cavity and a dielectric core in a TE01δ mode and a double TM01δ mode, It is characterized in that a quadruple mode resonator is provided as a whole.
[0012]
With this structure, a four-mode resonator is provided in one cavity, and for example, a resonator device having four-stage resonators is configured.
[0013]
Further, the resonator device according to the present invention is characterized in that a dielectric member for temperature compensation with respect to the resonance frequency in the quasi-TEM mode is provided in the cavity. Thereby, the temperature-frequency characteristics of the semi-coaxial resonator in the quasi-TEM mode are stabilized, and the frequency characteristics of the dielectric resonator in combination with the TM01δ mode or the TE01δ mode are stabilized.
[0014]
The filter according to the present invention is configured such that the resonator device having the above configuration is provided with input / output conductors for inputting / outputting signals by coupling to a predetermined resonance mode among the above resonance modes.
[0015]
The composite filter device of the present invention is configured by providing a plurality of the above filters.
[0016]
Further, a communication device according to the present invention is configured using the above filter or filter device.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
A resonator device according to a first embodiment will be described with reference to FIGS.
1 to 6 show examples of the electromagnetic field distribution in each resonance mode. In these figures, (A) is a top view with the upper cavity lid 2 removed, and (B) is a longitudinal sectional view of the resonator. In these figures, solid arrows indicate electric field vectors, and broken arrows indicate magnetic field vectors.
[0018]
In FIG. 1 to FIG. 6, the upper surface of the cavity body 1 is open, and the opening is covered with the cavity lid 2. The cavity body 1 and the cavity lid 2 form a hexahedral cavity. At the center of the inner bottom surface of the cavity body 1, a center conductor 4 is projected in a direction parallel to an inner wall surface other than the inner bottom surface of the cavity body 1. As shown in these figures, the diameter of the center conductor 4 is larger on the conductive end side to the cavity than on the open end side of the center conductor 4. The dielectric core 3 has a substantially octagonal plate shape, and has a hole formed in the center thereof to allow the center conductor 4 to pass therethrough. The dielectric core 3 is supported at a predetermined height from the inner bottom surface of the cavity main body 1 by a cylindrical support base 5 with the center hole inserted through the center conductor 4. 1 to 6, the support table 5 shows a cross section thereof.
[0019]
The center conductor 4 has such a length that a predetermined gap is formed between the top and the inner surface of the cavity lid 2, and is formed integrally with the cavity main body 1. The cavity body 1 and the cavity lid 2 are formed by casting or cutting a metal material or by coating a ceramic or resin surface with a conductive film.
[0020]
The center conductor 4 may be separated from the cavity body 1 and fixed to the cavity body 1 by screwing or soldering. Further, similarly to the cavity main body 1 and the cavity lid 2, the center conductor 4 may be formed by casting or cutting a metal material, or may be configured by coating a ceramic or resin surface with a conductor film.
[0021]
1 shows the TM01δx mode, FIG. 2 shows the TM01δy mode, FIG. 3 shows the TE01δ mode, and FIG. 4 shows the resonance mode of the semi-coaxial resonator.
[0022]
In the TM01δx mode, the electric field vector is oriented in the x-axis direction inside the dielectric core 3 as shown in FIG. 1, and the magnetic field vector draws a loop so as to surround the electric field vector. Here, the dielectric core has an octagonal plate shape, but the notation of the mode is a cylindrical coordinate system, h is the propagation direction, φ is the in-plane rotation direction of a plane perpendicular to the propagation direction, and r is the propagation direction. The number of waves of each electric field intensity distribution is represented in the order of TMφrh in each of the radiation (radius) directions in a vertical plane. Here, since there is a change in the electric field strength in the h direction, it is represented by δ, and this mode is represented as TM01δ mode. Also, the direction in which the electric field vector is directed is given last. Therefore, the mode shown in FIG. 1 is represented as TM01δx mode.
[0023]
In the TM01δy mode, the electric field vector is oriented in the y-axis direction inside the dielectric core 3 as shown in FIG. 2, and the magnetic field vector forms a loop surrounding the electric field vector.
[0024]
In the TE01δ mode, as shown in FIG. 3, the electric field vector forms a loop around the z-axis in the dielectric core 3, and the magnetic field vector forms a loop around the electric field vector. In this example, since the electric field vector draws a loop around the z-axis, it can be expressed as “TE01δz mode”. However, in this embodiment, only one mode is used for the TE01δ mode. It expresses.
[0025]
In the resonance mode of the semi-coaxial resonator, as shown in FIG. 4, the electric field vector is directed in the radiation direction from the center conductor 4 to the inner wall surface of the cavity, and the magnetic field vector draws a loop around the center conductor 4 in the circumferential direction. . Unlike a normal semi-coaxial resonator, since the dielectric core 3 is loaded and a gap exists between the upper part of the center conductor 4 and the top surface of the cavity, a quasi-TEM mode is obtained. Hereinafter, the resonance mode of the coaxial resonator is simply referred to as “TEM mode”.
As described above, four resonance modes are generated.
[0026]
5 and 6 show a modification of the above-described resonator device. Here, the dielectric core 3 is joined to the inner wall surface of the cavity body 1. Therefore, in this example, the TM010x mode shown in FIG. 5 and the TM010y mode shown in FIG. The TE01δ mode and the TEM mode are the same as those shown in FIGS.
[0027]
FIG. 7 shows the shape of the center conductor. Here, (A) shows the center conductor used in the resonator device shown in FIGS. The center conductor 4 is formed in a rod shape or a column shape having a side surface, and the dimension from the side surface of the center conductor 4 to the inner surface of the cavity body 1 facing the center conductor 4 is smaller on the conduction end side to the cavity than on the open end side of the center conductor 4. I am trying to become. Specifically, the size of the cross section in the direction perpendicular to the longitudinal direction of the center conductor 4 is set such that the conduction end side to the cavity is larger than the open end side of the center conductor 4. In other words, the inner diameter of the center conductor 4 is smaller on the open end side 42 than on the cavity conduction end side 41. In the example shown in (B), the inner diameter of the center conductor 4 is gradually reduced to a predetermined height from the cavity conduction end side to the open end side, and is thereafter kept constant.
[0028]
FIG. 8 shows characteristics of the resonance frequency and the no-load Q (Qo) of each resonance mode according to the shape of the center conductor. 8A, the horizontal axis represents the step height of the center conductor shown in FIG. 7A (the height from the cavity conduction end at the position where the inner diameter of the central conductor 4 becomes smaller), and the vertical axis represents the vertical axis. , The resonance frequency of each resonance mode is taken. When the step height of the center conductor is changed in this way, the TE01δ mode, the TM01δx mode, and the TM01δy mode hardly change, whereas in the TEM mode, the resonance increases as the step height of the center conductor increases. The frequency increases. This is a result of a decrease in the inductance component of the center conductor 4 on the side of the cavity conduction end where the magnetic field intensity is high, and a decrease in the capacitance component on the open end side where the electric field intensity is high. Although the TM111 mode is a spurious mode in the figure, even if the step height of the center conductor 4 is changed, the resonance frequency of the TM111 mode hardly changes and is not adversely affected.
[0029]
As shown in FIG. 8A, when the step height of the center conductor 4 is set to about 8 mm, the frequency of the TEM mode can be adjusted to the frequency of the TE01δ mode, the TM01δx mode, and the TM01δy mode. The portion indicated by an ellipse in FIG. 8A indicates a range where the frequencies of the respective resonance modes are uniform. Usually it is used in this range.
[0030]
In FIG. 8B, the horizontal axis represents the step height of the center conductor 4, and the vertical axis represents the no-load Q (Qo) of each resonance mode. As described above, Qo in the TEM mode increases as the step height of the center conductor 4 increases. At this time, the Qo of each of the modes TE01δ, TM01δx, and TMδy decreases, but the amount of reduction is small for all modes. Therefore, Qo hardly affects the mode of the dielectric resonator.
[0031]
9 and 10 show a resonator device according to the second embodiment. Here, both figures show the shape inside the cavity and the shape of the center conductor 4. The dielectric core 3 is the same as that shown in FIGS.
[0032]
In the example shown in FIG. 9, the inner dimension of the cavity main body 1 is set such that a portion facing the side surface on the conduction end side to the cavity is smaller than a portion facing the side surface on the open end side of the center conductor 4. ing. Further, in FIG. 10, the diameter of the center conductor is made larger on the side face on the cavity conduction end side than on the side face on the open end side. With this shape, the inductance component on the side of the cavity conducting end where the magnetic field strength of the center conductor 4 is high becomes small, and the capacitance component on the open end side where the electric field strength is high becomes small, and the frequency of the TEM mode increases. In the structure shown in FIG. 10, the above effect is further enhanced because the center conductor has a step shape as shown in FIG.
[0033]
Next, a resonator device according to a third embodiment will be described with reference to FIGS.
11 to 13 show a structure in which the TEM mode and the TM01δ mode are coupled. In these figures, (A) is a top view with the upper cavity lid 2 removed, and (B) is a longitudinal sectional view of the resonator.
[0034]
FIG. 11 shows an example in which the central axis of the open end side 42 of the central conductor 4 is displaced from the center of the cavity along the xy plane. FIG. 12 shows an example in which the position of the center conductor 4 is displaced from the center of the cavity along the xy plane. FIG. 13 shows an example in which the dielectric core 3 is displaced from the center of the cavity along the xy plane.
[0035]
In either case, the TEM mode and the TM01δ mode lose their symmetry in the electric field distribution, so that the two are coupled.
[0036]
FIG. 11C shows the relationship between the amount of displacement between the TEM mode and the TM01δx mode with respect to the amount of displacement of the open end side 42 of the center conductor in the structure shown in FIGS. As described above, the larger the displacement of the open end 42 of the center conductor, the larger the coupling between the two modes. This relationship is the same when the entire center conductor is displaced as shown in FIG. 12, and as the amount of displacement increases, the amount of coupling between the TM01δx mode and the TEM mode increases.
[0037]
In the example shown in FIG. 13, since the dielectric core 3 is displaced in both the x-axis and the y-axis (in the x + y-axis direction), the TM01δ mode (TM01δx + y mode) in which the electric field vector is oriented in the x + y direction and the TEM mode Are combined.
[0038]
FIG. 14 shows that the dielectric core 3 is provided with coupling grooves g1 and g2. Due to the presence of the groove g1, perturbation is applied to the even mode and the odd mode of the electric field of the TM01δx mode and the electric field of the TE01δ mode, and the TM01δx mode and the TE01δ mode are coupled. Similarly, due to the presence of the groove g2, perturbation is applied to the even mode and the odd mode of the electric field of the TM01δy mode and the electric field of the TE01δ mode, and the TM01δy mode and the TE01δ mode are coupled.
[0039]
FIG. 14C shows the relationship between the coupling coefficient and the depth of the grooves g1 and g2. As described above, the deeper the coupling groove, the greater the coupling amount between the TM01δx mode or the TM01δy mode and the TE01δ mode.
[0040]
Next, a resonator device according to a fourth embodiment will be described with reference to FIG.
In the resonator devices shown in the first to third embodiments, the dielectric resonator that resonates in the TE01δ mode, the TM01δx mode, and the TM01δy mode uses the frequency temperature coefficient of the dielectric core 3 (dielectric temperature using the dielectric core). The resonance frequency-temperature characteristic of the resonator can be stabilized by selecting a dielectric material. However, the TEM mode of the semi-coaxial resonator including the center conductor 4 and the cavity has a resonance frequency-temperature characteristic according to the linear expansion coefficient of the center conductor 4 and the cavity (the cavity body 1 and the cavity lid 2). . That is, the size of the entire semi-coaxial resonator increases with an increase in temperature, so that the frequency of the TEM mode decreases. Therefore, as shown in FIG. 15, a dielectric member 6 for temperature compensation is provided in the cavity. In particular, by providing this dielectric member 6 at a portion facing the open end side 42 of the center conductor 4, the capacitance component at the portion where the electric field strength in the TEM mode is high makes the influence of the frequency temperature coefficient of the dielectric member 6 larger. Will receive it.
[0041]
In this example, the frequency temperature coefficient of the temperature compensating dielectric member 6 is positive (coefficient in the direction in which the resonance frequency increases (relative permittivity decreases) as the temperature rises). The compensation component is added to the resonance frequency of the TEM mode in the rising direction as the temperature rises. That is, as shown in FIG. 15B, the resonance frequency of the TEM mode with respect to a temperature change can be stabilized by the action of the dielectric member 6.
[0042]
Next, a filter according to a fifth embodiment will be described with reference to FIGS.
In these figures, (A) is a top view with the upper cavity lid 2 removed, and (B) is a longitudinal sectional view of the resonator.
[0043]
In the example shown in FIG. 16, coupling grooves g1 and g2 are provided in the dielectric core 3. The groove g1 couples the TM01δx mode and the TE01δ mode, and the groove g2 couples the TM01δy mode and the TE01δ mode. The open end side 42 of the center conductor 4 is displaced in the y-axis direction. Therefore, the TM01δy mode and the TEM mode are coupled.
[0044]
Coaxial connectors 8a and 8b are provided on side surfaces of the cavity body 1, respectively. The center conductor of the coaxial connector 8a is provided with a coupling loop 9 whose end is connected to the inner wall surface of the cavity body 1. The coupling conductor 10 whose end is electrically connected to the cavity conducting end 41 of the central conductor 4 is provided in the central conductor of the coaxial connector 8b.
[0045]
With this structure, the coupling loop 9 couples to the TM01δx mode magnetic field, and the coupling conductor 10 couples to the TEM mode. Therefore, between the coaxial connectors 8a and 8b, a resonator having four modes of TM01δx → TE01δ → TM01δy → TEM is sequentially coupled. As a result, the filter functions as a filter having a band-pass filter characteristic of the four-stage resonator.
[0046]
As described above, by using the TM01δ mode or the TEM mode as the resonator at the input / output stage, external coupling is facilitated. That is, when the TE01δ mode is set as the input / output stage and the external coupling is attempted by a coupling loop, for example, the coupling loop is coupled with another resonance mode. However, the TM01δ mode or the TEM mode is set to the input / output stage. With a resonator, such a problem does not occur. This is the same in the other examples of the fifth embodiment, and also in the sixth to eighth embodiments described later.
[0047]
In the example shown in FIG. 17, the probe 11a extends from the center conductor of the coaxial connector 8a. This probe 11a is electrically coupled to the TM01δx mode by the dielectric core 3. Grooves g1 and g2 for coupling are formed in the dielectric core 3. The TM01δx mode couples with the TE01δ mode due to the presence of the groove g1. Further, the presence of the groove g2 couples the TE01δ mode with the TM01δy mode. Further, the open end side 42 of the center conductor 4 is displaced in the y-axis direction. Therefore, the TM01δy mode couples with the TEM mode. This TEM mode is coupled to the probe 11b of the coaxial connector 8b. As a result, resonators in four modes of TM01δx → TE01δ → TM01δy → TEM are sequentially coupled between the coaxial connectors 8a-8b. Thus, the filter functions as a filter having a band-pass filter characteristic of the four-stage resonator.
[0048]
In the example shown in FIG. 18, the coupling conductor 10 is provided in a loop between the center conductor of the coaxial connector 8b and the cavity conductive end side 41 of the center conductor. The point where the grooves g1 and g2 are provided in the dielectric core 3 and the point where the open end side of the center conductor is displaced in the y-axis direction are the same as those shown in FIGS.
[0049]
With this structure, the coupling conductor 10 couples with the TEM mode. In the example shown in FIG. 17, since the probe 11b merely extends in the x-axis direction, the probe 11b is also coupled to the TM01δx mode to some extent. However, in the example shown in FIG. 18, the probe 11b is detoured so as to avoid magnetic field coupling with the TM01δx mode. Therefore, it hardly couples with the TM01δx mode. Although the coupling conductor 10 is partially coupled to the TM01δy mode, the coupling portion is mutually symmetrical with respect to the x-axis, so that the coupling portions cancel each other out and are not coupled to the TM01δy mode.
[0050]
Next, the configuration of a filter according to the sixth embodiment will be described with reference to FIG. This filter is a filter composed of a total of eight stages of resonators, each having four stages of resonators in two units Ua and Ub. That is, the coupling loop 9a connected to the center conductor of the coaxial connector 8a is coupled to the magnetic field of the TM01δx mode by the dielectric core 3a, and the TM01δx mode is coupled to the TE01δ mode by the presence of the groove g1a. The TE01δ mode is combined with the TM01δy mode by the presence of the groove g2a. The TM01δy mode is coupled with the TEM mode by displacing the open end 42a of the center conductor 4a. A coupling loop 9c provided inside the cavity bodies 1a and 1b is magnetically coupled to the TEM mode. This coupling loop 9c also couples with the TEM mode on the unit Ub side. Since the unit Ub has the same configuration as the unit Ua, a total of eight stages of resonators are formed between the coaxial connectors 8a and 8b. As a result, the filter functions as a filter having band-pass characteristics composed of eight stages of resonators.
[0051]
FIGS. 20A and 20B are diagrams illustrating a configuration of a duplexer according to a seventh embodiment, in which FIG. 20A is a top view with a cavity lid removed, and FIG. 20B is a longitudinal sectional view thereof. The probe 11a of the coaxial connector 8a couples with the TEM mode of the unit Ua. This TEM mode is coupled to the TM01δx + y mode because the open end side 42a of the center conductor 4a is displaced in the right 45 ° direction (x + y direction) in FIG. The TM01δx + y mode is combined with the TE01δ mode due to the presence of the groove g1a. The TE01δ mode is combined with the TM01δx-y mode by the presence of the groove g2a. The probe 11c of the coaxial connector 8c is coupled to the TM01δx-y mode of the unit Ua. The unit Ub has the same configuration as the unit Ua, and the probe 11c is coupled to the TM01δx + y mode of the right unit. Therefore, four-stage resonators are sequentially coupled between the coaxial connectors 8a-8c, and similarly, four-stage resonators are sequentially coupled between the coaxial connectors 8c-8b. By determining the pass band of each filter, the filter functions as, for example, a duplexer having a transmission signal input terminal 8a, a reception signal output terminal 8b, and an antenna terminal 8c.
[0052]
FIG. 21 is a diagram illustrating a configuration of a filter according to the eighth embodiment. The unit Ua resonates in the TEM mode by the center conductor 4a and the surrounding cavity. The coupling conductor 10a of the coaxial connector 8a couples with the TEM mode. The configuration of the unit Ub is the same as that of the unit Ua shown in FIG. The probe 11ab couples with the TEM mode of this unit Ub. Further, the probe 11bc couples with the TM01δx-y mode of the unit Ub. The probe 11bc couples with the TEM mode of the unit Uc. The coupling conductor 10c of the coaxial connector 8c couples with the TEM mode of the unit Uc. As a result, six stages (1 + 4 + 1 = 6) of resonators are formed between the coaxial connectors 8a-8c. As a result, the filter functions as a filter having band-pass characteristics including six resonators.
[0053]
Next, FIG. 22 shows a configuration of a communication device as a ninth embodiment. Here, the duplexer has the configuration shown in FIG. 20, and the reception filter passes the frequency of the reception signal, and the transmission filter passes the frequency of the transmission signal. A receiving circuit is connected to an output port of the receiving filter, a transmitting circuit is connected to an input port of the transmitting filter, and an antenna is connected to an input / output port of the duplexer. This constitutes the high frequency section of the communication device. When a single filter is used in the high-frequency section of the communication device, a filter having the configuration shown in FIGS. 16 to 19 or 21 can be used.
[0054]
【The invention's effect】
According to the present invention, the dimension from the side surface of the center conductor provided in the conductive cavity to the inner surface of the cavity opposed thereto is set such that the conduction end side to the cavity is smaller than the open end side of the center conductor. By doing so, the resonance frequency of the quasi-TEM mode of the semi-coaxial resonator is increased without affecting the resonance of the dielectric resonator, and the frequency of the quasi-TEM mode is changed to the frequency of the TE mode or TM mode of the dielectric resonator. And a more multiplexed resonator device can be obtained.
[0055]
Further, according to the present invention, the size of the cross section in the direction perpendicular to the longitudinal direction of the center conductor is set to be larger on the conductive end side to the cavity than on the open end side of the center conductor. By changing the shape of the center conductor without changing the dimensions, the frequency of the quasi-TEM mode of the semi-coaxial resonator can be increased.
[0056]
Further, according to the present invention, the inner dimension of the cavity is made smaller at a portion facing the side surface on the conduction end side to the cavity than at a portion facing the side surface on the open end side of the center conductor. By changing the shape in the cavity without changing the shape of the conductor, the frequency of the quasi-TEM mode of the semi-coaxial resonator can be increased.
[0057]
Further, according to the present invention, the dielectric core is provided with a hole through which the center conductor is inserted, and the dielectric core is disposed in the cavity in a state where the center conductor is inserted through the hole, so that the dielectric core is formed in the cavity. , And the mode of the dielectric resonator can be used without generating unnecessary spurious modes.
[0058]
According to the invention, the semi-coaxial resonator formed by the cavity and the center conductor resonates in the quasi-TEM mode, and the dielectric resonator formed by the cavity and the dielectric core resonates in at least the TM01δ mode. By combining a plurality of resonance modes including the above and operating as a multi-stage resonator and operating the TM01δ mode or the quasi-TEM mode as an input / output stage resonator, a resonance having a large number of stages is provided in one cavity. A resonator device can be provided, and a resonator device including a predetermined number of resonators in a limited space can be easily configured.
[0059]
According to the present invention, the semi-coaxial resonator formed by the cavity and the center conductor resonates in the quasi-TEM mode, and the dielectric resonator formed by the cavity and the dielectric core resonates in the TE01δ mode and the double TM01δ mode. The use of the quad-mode resonator makes it possible to provide a quad-mode resonator in one cavity, for example, to configure a resonator device having four-stage resonators.
[0060]
According to the present invention, the temperature-frequency characteristic of the semi-coaxial resonator in the quasi-TEM mode is stabilized by providing the dielectric member for temperature compensation for the resonance frequency in the quasi-TEM mode in the cavity, and The frequency characteristics of the resonator in combination with the TM01δ mode or the TE01δ mode are stabilized.
[0061]
Further, according to the invention, by forming a filter / composite filter device including the resonator device having the above configuration, a filter / composite filter device having a small number of stages and a large number of stages can be obtained.
Further, according to the present invention, a small and lightweight communication device can be configured.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a TM01δx mode electromagnetic field distribution used in a resonator device according to a first embodiment.
FIG. 2 is a diagram showing an example of a TM01δy mode electromagnetic field distribution used in the resonator device.
FIG. 3 is a diagram showing an example of a TE01δ mode electromagnetic field distribution used in the resonator device.
FIG. 4 is a view showing an example of a TEM mode electromagnetic field distribution used in the resonator device.
FIG. 5 is a diagram showing an example of an electromagnetic field distribution of another TM mode used in the resonator device.
FIG. 6 is a diagram showing an example of an electromagnetic field distribution of another TM mode used in the resonator device.
FIG. 7 is a diagram showing a configuration of a center conductor in the resonator device.
FIG. 8 is a diagram showing a relationship between the step height of the center conductor and the resonance frequency and the no-load Q of each mode.
FIG. 9 is a diagram showing the configuration of the center conductor and the inside of the cavity of the resonator device according to the second embodiment;
FIG. 10 is a diagram showing the configuration of the center conductor and the inside of the cavity of the resonator device according to the second embodiment;
FIG. 11 is a diagram showing a coupling structure between a TEM mode and a TM01δ mode of the resonator device according to the third embodiment.
FIG. 12 is a diagram showing a coupling structure between a TEM mode and a TM01δ mode of the resonator device.
FIG. 13 is a diagram showing a coupling structure between a TEM mode and a TM01δ mode of the resonator device.
FIG. 14 is a diagram showing a coupling structure between two modes of a dielectric resonator in the resonator device.
FIG. 15 is a diagram showing an example of temperature compensation of the resonator device according to the fourth embodiment.
FIG. 16 is a diagram showing a configuration of a filter according to a fifth embodiment.
FIG. 17 is a diagram showing a configuration of another filter according to the fifth embodiment.
FIG. 18 is a diagram showing a configuration of another filter according to the fifth embodiment.
FIG. 19 is a diagram showing a configuration of a filter according to a sixth embodiment.
FIG. 20 is a diagram illustrating a configuration of a duplexer according to a seventh embodiment.
FIG. 21 is a diagram showing a configuration of a filter according to an eighth embodiment.
FIG. 22 is a block diagram showing a configuration of a communication device according to a ninth embodiment.
FIG. 23 is an exploded perspective view showing a configuration of a conventional resonator device.
[Explanation of symbols]
1-cavity body
2-cavity lid
3- Dielectric core
4-Center conductor
5-Support
6- Dielectric member
8-coaxial connector
9-coupling loop
10-conductor for coupling
11-probe
41-Cavity conduction end side
42-Open end side
g-groove

Claims (10)

In a resonator device provided with a dielectric core together with a center conductor having one end connected to the cavity in a conductive cavity,
The center conductor has a rod shape or a column shape having a side surface, and a dimension from a side surface of the center conductor to an inner surface of the cavity opposed thereto is smaller on a conductive end side to the cavity than on an open end side of the center conductor. Resonator device. 2. The resonator device according to claim 1, wherein a size of a cross section in a direction perpendicular to a longitudinal direction of the center conductor is larger at a conduction end side to the cavity than at an open end side of the center conductor. 3. 3. The resonance according to claim 1, wherein an inner dimension of the cavity is smaller in a portion facing a side surface on a conduction end side to the cavity than in a portion facing a side surface on an open end side of the center conductor. 4. Equipment. 4. The resonance according to claim 1, wherein the dielectric core is provided with a hole through which the center conductor is inserted, and the dielectric core is disposed in the cavity with the center conductor inserted through the hole. 5. Equipment. A semi-coaxial resonator formed by the cavity and the center conductor resonates in a quasi-TEM mode, and a dielectric resonator formed by the cavity and the dielectric core resonates in at least a TM01δ mode, including the TM01δ mode and the quasi-TEM mode. The resonator device according to any one of claims 1 to 4, wherein a plurality of resonance modes are combined to function as a plurality of resonators. A semi-coaxial resonator formed by the cavity and the center conductor is resonated in a quasi-TEM mode, and a dielectric resonator formed by the cavity and the dielectric core is resonated in a TE01δ mode and a double TM01δ mode. The resonator device according to claim 1, wherein the resonator device functions as a resonator. The resonator device according to any one of claims 1 to 6, wherein a dielectric member for temperature compensation for a resonance frequency in the quasi-TEM mode is provided in the cavity. A filter comprising the resonator device according to any one of claims 1 to 7, wherein an input / output conductor for inputting / outputting a signal is provided while being coupled to a predetermined resonance mode among the resonance modes. A composite filter device comprising a plurality of the filters according to claim 8. A communication device comprising the filter according to claim 8 or the composite filter device according to claim 9.

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