JP4284832B2 - Multimode dielectric resonator device, filter, duplexer, and communication device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dielectric resonator device that operates in multiple modes, a filter using the same, a duplexer, and a communication device using these.
[0002]
[Prior art]
Conventionally, a TE01δ mode or a TM01δ mode is used for a dielectric resonator in which a dielectric core is disposed in a cavity. When a multi-stage dielectric resonator device is configured by a dielectric resonator using such a dielectric core, a plurality of dielectric cores are arranged in the cavity.
[0003]
However, in such a structure using a single resonance mode generated in a single dielectric core, if the number of resonators is increased, the overall size increases, and a plurality of dielectric cores must be positioned and fixed with high accuracy. Therefore, it is difficult to manufacture a dielectric resonator device such as a dielectric filter having uniform characteristics.
[0004]
Therefore, the applicant of the present application has filed an application in JP-A-11-145704 regarding a dielectric resonator device in which the number of multiplexing is increased while using a single dielectric core. The dielectric resonator device according to the above application has a TMx, TMy, and TMz mode in which an electric field vector is oriented in each of the x, y, and z axes when the resonance space is represented by x, y, z rectangular coordinates. Then, Tex, TEy, and TEz modes in which the electric field vector draws a loop in the plane direction perpendicular to the respective axes of x, y, and z are generated so that a maximum of six modes can be used.
[0005]
[Problems to be solved by the invention]
In the multimode dielectric resonator device according to the above application, in order to couple between predetermined resonance modes, a perturbation is applied by providing a groove or a hole in a portion where electric fields of two resonance modes to be coupled are concentrated. Energy was transferred between the two resonance modes. However, when the TM mode and the TE mode are coupled in such a structure, strong coupling is difficult to obtain because the electric fields of the two basically intersect perpendicularly. In addition, in order to make a strong coupling, it is necessary to form deep coupling grooves and holes. However, due to the influence, the distribution shape of the electric field in each resonance mode is disturbed, so that the resonance frequency rises and the filter characteristics are further improved. There is also a problem that adjustment becomes difficult.
[0006]
Therefore, in Japanese Patent Application No. 11-333405 and Japanese Patent Application No. 11-333404, the applicant of the present application has applied for a multimode dielectric resonator device. The former dielectric resonator device is composed of a dielectric core portion for TM mode that resonates in a TM mode in a use frequency band and a dielectric core portion for TE mode that resonates in multiple TE modes in a use frequency band. A core is constructed and disposed in the cavity. In order to obtain the above-described TM mode and TE mode internal coupling, the latter dielectric resonator device has a dielectric core plate portion on which the TM mode electric field is concentrated at the raised portion of the dielectric core on which the TE mode electric field is concentrated. The configuration is asymmetric with respect to FIG.
[0007]
In the former dielectric resonator device, in order to mainly change the resonance frequency of the TM mode, changing the side dimension of the plate portion of the core is the method of changing the resonance frequency of the TM mode to the greatest extent.
(1) At the same time, the frequency of the TEz mode also fluctuates.
[0008]
(2) Fine adjustment is difficult.
[0009]
(3) If it is not cut evenly, it will cause internal coupling.
[0010]
(4) When the gap with the input / output probe changes, the external coupling Q (Qe) changes.
[0011]
With such difficulties. Also, although the resonance frequency of the TM mode varies depending on the method of cutting the support portion that supports the dielectric core in the cavity, there arises a problem that the strength of the support portion is reduced.
[0012]
In addition, as a method of adjusting the internal coupling between the TM mode and the TE mode in the latter dielectric resonator device, a method of cutting the raised portion of the dielectric core is considered,
(1) A significant change in coupling coefficient cannot be expected.
[0013]
(2) Since the two sets of TM and TE modes are combined at the same time, the two sets of coupling coefficients change simultaneously.
[0014]
The problem arises.
[0015]
An object of the present invention is to design and adjust the resonance frequency of the TE mode and the TM mode, and to design and adjust the coupling amount between the TE mode and the TM mode, a multimode dielectric resonator device, a filter, It is an object of the present invention to provide a duplexer and a communication device including these.
[0016]
[Means for Solving the Problems]
The present invention includes a TM mode dielectric core portion that resonates at least one TM mode in a use frequency band, and a TE mode dielectric core portion that resonates each TE mode of a multiple TE mode in a use frequency band. In a multimode dielectric resonator device in which a dielectric core is disposed in a conductive cavity, a TM mode resonant frequency adjustment protrusion is provided at the end of the TM mode dielectric core where the TM mode electric field is concentrated. Provide. With this structure, only the resonance frequency of the TM mode is raised independently so as not to affect the resonance frequency of other modes.
[0017]
According to the present invention, the TM mode dielectric core is formed into a plate shape, and the protrusion is projected in a direction substantially perpendicular to the plate-like surface. This suppresses the influence on Qe when the protrusion is cut to adjust the resonance frequency of the TM mode.
[0018]
In addition, the present invention increases the sensitivity of the frequency adjustment with respect to the cutting amount by making the TM mode dielectric core into a plate shape and projecting the protrusion in a direction substantially parallel to the surface.
[0019]
Further, according to the present invention, the protruding amount of the protrusion in the direction perpendicular to the plate-like surface of the TM mode dielectric core is asymmetric with respect to the plate-like surface of the TM mode dielectric core. . With this structure, the coupling amount between the TM mode and the TE mode can be adjusted. The TE mode in which an electric field loop is drawn around the center line by designing and adjusting the protrusion amount of the protrusion at a symmetrical position with respect to a predetermined center line parallel to the surface of the TM mode dielectric core; Since the coupling amount with the TM mode in which the electric field is oriented perpendicular to the center line can be determined, the coupling amount is designed and adjusted independently for the two combinations of the TE mode and the TM mode by the arrangement of the central axis. can do.
[0020]
In addition, the present invention adjusts the TM-mode resonance frequency of the multi-mode dielectric resonator device by cutting the protrusion in the multi-mode dielectric resonator device and adjusting the protrusion amount of the protrusion, or TM The coupling between the mode and the TE mode is adjusted.
[0021]
In addition, the present invention uses the multimode dielectric resonator device having the above-described structure and provides input / output means coupled to a predetermined resonance mode to constitute a filter or a duplexer.
[0022]
Furthermore, the present invention constitutes a communication device by using the multimode dielectric resonator device, filter or duplexer to pass a transmission signal or a reception signal in a high frequency circuit section or as an antenna duplexer.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
The configuration of the multimode dielectric resonator device according to the first embodiment of the present invention will be described with reference to FIGS.
FIG. 1A is a perspective view of a basic component part of a multimode dielectric resonator device, and FIG. 1B is a perspective view of a dielectric core part. In (A), reference numeral 2 denotes a cavity in which the dielectric core 10 is housed, and a conductor film is formed on the outer surface of a dielectric ceramic square tube member. A dielectric plate or a metal plate on which a conductor film is formed is disposed on the upper and lower opening surfaces of the cavity 2 in the drawing to form a substantially rectangular parallelepiped shield space. Reference numeral 10 denotes a dielectric core, which includes a TM mode dielectric core portion 11 having a plate shape, and a TE mode dielectric core portion 12 in which a cylinder swells in a stepped manner. Adjustment protrusions 16a, 16b, 16c, and 16d for adjusting the TM mode resonance frequency are formed at the end of the TM mode dielectric core portion 11.
[0024]
In FIG. 1, in order to clearly show the arrangement structure of the dielectric core in the cavity, a support for supporting the dielectric core 10 in the cavity and an input / output means for inputting / outputting signals to / from the outside. Is not shown.
[0025]
2A is a top view of the multimode dielectric resonator device shown in FIG. 1A, and FIG. 2B is a cross-sectional view taken along the line BB in FIG. In FIG. 2, reference numeral 3 denotes a support that connects a part of the TM core dielectric core portion 11 of the dielectric core and the inner wall surface of the cavity 2, and is made of a material having a lower dielectric constant than the dielectric core.
[0026]
FIG. 3 shows an example of electric field distribution of five resonance modes used in this multimode dielectric resonator device. However, in FIG. 3, the adjustment protrusions 16 a to 16 d are omitted in order to clearly show the shape of each mode. Here, (A) shows the TMx + y mode, and (B) shows the TMy-x mode. As described above, in the TMx + y mode, the electric field vector is directed in the x + y axis direction from one conductor film formed on the outer surface of the cavity to the other conductor film opposed thereto, and similarly, the TMy-x mode is in the yx direction. Electric field vector is suitable. In FIG. 3, (C) shows the TEz mode, (D) shows the TEy-x mode, and (E) shows the TEx + y mode. In the TEz mode, the electric field vector draws a loop in the plane direction perpendicular to the z axis, in the TEy-x mode, the electric field vector draws a loop in the plane direction perpendicular to the xy axis, and in the TEx + y mode, the loop is perpendicular to the x + y axis. The electric field vector draws a loop on the surface.
[0027]
Although the TMz mode in which the electric field vector is oriented in the z-axis direction also occurs, the thickness direction dimension of the TM mode dielectric core portion 11 forming a plate shape is smaller than the dimension in the other direction. The resonance frequency of the first mode is higher than the use frequency band.
[0028]
FIG. 4 shows the directions of the electric field vectors for the TMx + y mode and the TMy-x mode. In the TMx + y mode shown in (A), an electrostatic capacitance component generated between the adjustment protrusions 16a and 16c and the conductor film formed on the outer surface of the cavity 2 cuts the ends of the adjustment protrusions 16a and 16c. .., And changes the TMx + y mode resonance frequency in the upward direction. Similarly, the resonance frequency of the TMy-x mode is adjusted in the upward direction by cutting the adjustment protrusions 16b and 16d and shortening the protrusion amount. At this time, the adjustment protrusions 16a to 16d are formed in a substantially L-shaped cross section along the outer shape of the TM mode dielectric core, and the cross-sectional area is reduced, so that cutting is facilitated during this cutting adjustment. . When cutting the adjustment protrusion, it is preferable to cut the same amount of 16a, 16c or 16b, 16d in consideration of the balance of the electromagnetic field distribution.
[0029]
By the way, since the electromagnetic field of each mode of the TM mode and the TE mode coexists in the central portion of the dielectric core 10, this portion is also the TM mode dielectric core portion 11 and the TE mode dielectric core portion 12. But there is. Assuming that the TM mode dielectric core portion is a square plate and the TE mode dielectric core portion is a sphere, and the two portions are formally completely separated, as shown in FIG. Is divided into a plate-like TM mode dielectric core portion 11 and two hemispherical TE mode dielectric core portions 12a and 12b, or a plate having a hole at the center as shown in FIG. The TM mode dielectric core portion 11 and the spherical TE mode dielectric core portion 12 inserted into the hole are divided. However, even in the case of (A), the TE mode electric field vector passes through the TM mode dielectric core part 11, and in the case of (B), the TM mode electric field vector passes through the TE mode dielectric core part 12. It should be noted that a part of each of the TM mode dielectric core portion and the TE mode dielectric core portion according to the present invention is shared by the TM mode and the TE mode at the central portion of the dielectric core. It is.
[0030]
Next, the configuration of the multimode dielectric resonator device according to the second embodiment will be described with reference to FIGS.
FIG. 5A is a perspective view of a basic component part of a multimode dielectric resonator device, and FIG. 5B is a perspective view of a dielectric core part. The configuration of the dielectric core 11 is different from the example shown in FIG. 1, and the rest are the same as those shown in FIG.
[0031]
The dielectric core 10 includes a TM mode dielectric core portion 11 having a plate shape, and a TE mode dielectric core portion 12 in which a cylindrical column bulges out from the portion, and includes a TM mode dielectric core portion. 11 is formed with adjustment protrusions 17a, 17b, 17c, and 17d for adjusting the resonance frequency of the TM mode.
[0032]
6A is a top view of the multimode dielectric resonator device shown in FIG. 5A, and FIG. 6B is a cross-sectional view taken along the line BB in FIG. In FIG. 6, reference numeral 3 denotes a support member that connects a part of the TM core dielectric core portion 11 of the dielectric core and the inner wall surface of the cavity 2, and is made of a material having a lower dielectric constant than the dielectric core.
[0033]
FIG. 7 shows an example of electric field distribution of five resonance modes used in this multimode dielectric resonator device. However, also in FIG. 7, the adjustment protrusions 17a to 17d are omitted in order to clearly show the shape of each mode. Here, (A) shows the TMx mode, and (B) shows the TMy mode. As described above, in the TMx mode, the electric field vector is directed in the x-axis direction from one conductor film formed on the outer surface of the cavity to the other conductor film facing the conductor film, and similarly, in the TMy mode, the electric field vector is directed in the y direction. . In FIG. 7, (C) shows the TEz mode, (D) shows the TEy mode, and (E) shows the TEx mode. In the TEz mode, the electric field vector draws a loop in the plane direction perpendicular to the z-axis, in the TEy mode, the electric field vector draws a loop in the plane direction perpendicular to the y-axis, and in the TEx mode, the electric field vector appears in the plane perpendicular to the x-axis. Draws a loop.
[0034]
FIG. 8 shows the directions of the electric field vectors for the TMx mode and the TMy mode. In the TMx mode shown in (A), the electrostatic capacitance component generated between the adjustment protrusions 17a and 17c and the conductor film formed on the outer surface of the cavity 2 cuts the ends of the adjustment protrusions 17a and 17c. The resonance frequency of the TMx mode is adjusted in the upward direction by shortening the protruding amount. Similarly, the resonance frequency of the TMy mode is adjusted in the upward direction by cutting the end portions of the adjustment protrusions 17b and 17d and shortening the protrusion amount.
[0035]
FIG. 9 is a perspective view of a dielectric core portion of a multimode dielectric resonator device according to the third embodiment.
In the example shown in FIG. 1, the adjustment protrusions 16 a to 16 d having L-shaped cross sections are formed at the four corners of the TM mode dielectric core portion 11, and these adjustment protrusions 16 a to 16 d are formed as shown in FIG. 9. In addition, a prismatic shape may be used.
[0036]
Next, the configuration of the multimode dielectric resonator device according to the fourth embodiment will be described with reference to FIGS.
FIG. 10 is a perspective view of the dielectric core portion. In this example, adjustment protrusions 18a to 18d and 18a 'to 18d' are formed at the four corners of the TM mode dielectric core portion 11 having a plate shape so as to protrude parallel to the plate surface.
[0037]
FIG. 11 is a top view of a multimode dielectric resonator device constructed by placing this dielectric core in a cavity, and shows the direction of the electric field vector in the TMx + y mode and TMy-x mode. In the TMx + y mode, since the electric field vector is directed from one corner of the TM mode dielectric core portion 11 to the other opposite corner, the adjustment protrusions 18a, 18a ', 18c, 18c' are cut and the amount of protrusion By adjusting the resonance frequency of the TMx + y mode in the upward direction. Similarly, the resonance frequency of the TMy-x mode is adjusted by cutting the adjustment protrusions 18b, 18b ′, 18d, and 18d ′ to shorten the protrusion amount.
[0038]
The adjustment protrusions 18a to 18d projecting along the upper surface of the TM mode dielectric core portion 11, and the adjustment protrusions 18a 'to 18d' projecting along the lower surface of the TM mode dielectric core portion. Since the input / output probe (Qe probe) is placed between the two upper and lower adjustment projections, the input / output probe and the TM mode dielectric core are brought close to each other and strongly coupled to each other. Can do.
[0039]
12 and 13 are diagrams showing the configuration of the multimode dielectric resonator device according to the fifth embodiment.
FIG. 12 is a perspective view of the dielectric core portion, and FIG. 13 is a top view of the multimode dielectric resonator device, showing the direction of the electric field vectors for the TMx mode and the TMy mode. In this example, adjustment protrusions 19a to 19d and 19a 'to 19d' are projected from the center of each of the four sides of the TM mode dielectric core portion 11 along the surface of the TM mode dielectric core portion.
[0040]
FIG. 13 is a top view of a multimode dielectric resonator device constructed by placing this dielectric core in a cavity, and shows the direction of the electric field vector in the TMx mode and TMy mode. In the TMx mode, the electric field vector is directed from one side of the TM mode dielectric core portion 11 to the opposite side, so the adjustment protrusions 19a, 19a ', 19c, 19c' are cut and the amount of protrusion Is shortened to adjust the resonance frequency of the TMx mode in the upward direction. Similarly, the resonance frequency in the TMy mode is adjusted by cutting the adjustment protrusions 19b, 19b ′, 19d, 19d ′ and shortening the protrusion amount.
[0041]
Also in this example, adjustment protrusions 19a to 19d protruding along the upper surface of the TM mode dielectric core portion 11 and adjustment protrusion 19a 'protruding along the lower surface of the TM mode dielectric core portion. Since the input / output probe is disposed between the upper and lower two adjustment protrusions, the input / output probe and the TM mode dielectric core can be brought close to each other and strongly coupled to each other. it can.
[0042]
Next, an example of a filter in which the five resonance modes shown in the multimode dielectric resonator device shown in the first embodiment are coupled in order will be described with reference to FIGS.
14A is a top view of the filter, and FIG. 14B is a cross-sectional view of the BB portion of FIG. In FIG. 14, reference numerals 5a and 5b denote coaxial connectors, and probes 4a and 4b protruding into the cavity 2 are attached to the central conductors. 14a and 14a 'are grooves for coupling between the TEz mode and the TEx + y mode, and 14b and 14b' are grooves for coupling between the TEy-x mode and the TEz mode.
[0043]
FIG. 15 shows the operation of the coupling grooves 14b and 14b '. However, here, the TE core dielectric core portion is simply shown as a sphere. 15A shows the electric field vectors of the TEy-x mode and the TEz mode as a perspective view, and FIG. 15B shows the electric field vectors of the two modes in the cross section on the (yx) -z plane. ing. Here, considering a mode (TEy-x + z mode) obtained by adding the TEy-x mode and the TEz mode, as shown in (C), this mode has an electric field vector on a plane perpendicular to the y-x + z-axis direction. It becomes a mode to draw a loop. Further, the electric field vector of the difference mode (TEy-xz mode) between the TEy-x mode and the TEz mode becomes a mode in which a loop is drawn on a plane perpendicular to the yxz-axis direction as shown in (D). .
[0044]
Since the coupling grooves 14b and 14b 'are at positions where the loop of the electric field vector of the TEy-xz mode passes, the coupling grooves 14b and 14b' act in a direction of weakening the electric field of the TEy-xz mode. And combine. Similarly, in FIG. 14, the coupling grooves 14 a and 14 a ′ perturb the TEz mode and the TEx + y mode to couple the TEz mode and the TEx + y mode.
[0045]
FIG. 16 shows a state of coupling between the TEx + y mode and the TMy-x mode. This cross section is a cross section in the same plane as that shown in FIG. The arrows shown by the curves in the figure represent the electric field vectors of the TMy-x mode and the TEx + y mode. If the mode shown in (A) is the even mode and the mode shown in (B) is the odd mode, the bulging amount of the TE mode dielectric core portion 12 with respect to the plate-like TM mode dielectric core portion 11 is vertically asymmetric. Therefore, perturbation is given to the electric field intensity distribution in the TMy-x mode and the TEx + y mode. As a result, energy is transferred between the two modes, and the two modes are combined.
[0046]
The coupling between the TM mode and the TE mode due to the vertical asymmetry of the TE mode dielectric core 12 with respect to the TM mode dielectric core 11 is a coupling between the TMx + y mode and the TEy-x mode orthogonal to the two modes, respectively. The same applies to.
[0047]
The vertical asymmetry of the TE mode dielectric core 12 with respect to the TM mode dielectric core 11 is also caused by the vertical asymmetry of the adjustment protrusion 16 protruding in the vertical direction from the TM mode dielectric core portion 11. Therefore, the distribution of the electric field intensity in the TE mode and the TM mode is perturbed by setting the protruding amount of the adjustment protrusion 16 from the TM mode dielectric core portion 11 in the vertical direction. For example, when the TE mode dielectric core 12 is displaced upward with respect to the TM mode dielectric core, the protruding amounts of the upper adjustment protrusions 16d and 16b are shorter than the lower adjustment protrusions 16d 'and 16b'. Then, the perturbation of the electric field intensity distribution between the TMy-x mode and the TEx + y mode is reduced, and the coupling coefficient between the two modes is reduced. Conversely, if the amount of protrusion of the lower adjustment protrusions 16d 'and 16b' is made shorter than that of the upper adjustment protrusions 16d and 16b, the perturbation of the electric field strength distribution between the TMy-x mode and the TEx + y mode becomes larger. The coupling coefficient between the two modes increases. Similarly, if the protrusions of the adjustment protrusions 16a and 16c are made shorter than the adjustment protrusions 16a 'and 16c' below, the coupling coefficient between the TMx + y mode and the TEy-x mode is lowered. Conversely, if the amount of protrusion of the lower adjustment protrusions 16a 'and 16c' is made shorter than that of the upper adjustment protrusions 16a and 16c, the coupling coefficient between the TMx + y mode and the TEy-x mode increases.
[0048]
As described above, the adjustment protrusion 16 can adjust the coupling between the TE mode and the TM mode as well as the adjustment of the resonance frequency of the TM mode as described above. In addition, by providing adjustment protrusions at the four corners of the TM mode dielectric core, coupling between (TMx + y mode)-(TEy-x mode) and coupling between (TMy-x mode)-(TEx + y mode) can be achieved. Can be adjusted independently.
[0049]
Therefore, due to the vertical asymmetry of the TE mode dielectric core 12 with respect to the TM mode dielectric core 11, the coupling between the TMx + y mode and the TEy-x mode and the coupling between the TEx + y mode and the TMy-x mode occur, and the coupling groove 14a. , 14a 'causes the coupling between the TEy-x mode and the TEz mode, and coupling grooves 14b, 14b' cause the coupling between the TEz mode and the TEx + y mode, so that TMx + y → TEy−x → TEz → TEx + y → TMy− It acts as a five-mode resonator in which five resonators are sequentially coupled in the order of x.
[0050]
In FIG. 14, the probe 4a is electrically coupled to the TMx + y mode, which is the first-stage resonator, and the probe 4b is field-coupled to the TMy-x mode, which is the last-stage resonator, so that there are eventually five stages between the coaxial connectors 5a-5b. It functions as a filter showing the band-pass characteristics of the resonator.
[0051]
Next, a configuration example of a filter formed by combining another resonator with a multimode dielectric resonator device will be described with reference to FIG.
FIG. 17A is a top view with the upper lid removed, and FIG. 17B is a cross-sectional view of the BB portion in FIG. In FIG. 17, reference numeral 20 denotes the five-mode resonator shown in FIG. Reference numerals 21 and 22 denote semi-coaxial resonators. The semi-coaxial resonators 21 and 22 include a center conductor 8 in the cavity, and the capacitance generated between the lower end portion of the frequency adjusting screw 9 and the upper end portion of the center conductor 8, the length of the center conductor 8, and the like. The resonance frequency is determined. A coupling loop 7a is provided between the central conductor of the coaxial connector 5a and the inner surface of the cavity, and external coupling is established by this coupling loop. Similarly, a coupling loop 7d is provided between the central conductor of the coaxial connector 5b and the inner surface of the cavity, and external coupling is established by this coupling loop. Further, coupling loops 7b and 7c are connected to the probes 4a and 4b of the resonator 20, respectively, and the coupling loops 7b and 7c are magnetically coupled to the semi-coaxial resonators 21 and 22, respectively.
[0052]
With the above configuration, the first-stage and final-stage resonators and the five-stage dielectric resonators therebetween serve as a filter having a band-pass characteristic including a total of seven-stage resonators. 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 quintuple mode resonator 20 is suppressed by the semi-coaxial resonators 21 and 22, the overall spurious characteristics are improved. Further, by eliminating the need for direct coupling to the outside, the probes 4a and 4b in the five-mode resonator 20 can be made smaller, thereby reducing the direct path of the signal between the input and output, and deterioration of the characteristics due to the direct path. Does not occur.
[0053]
Although the semi-coaxial resonator is used in the example shown in FIG. 17, coaxial resonators can be used in the first stage and the final stage in the same manner, and the same effect can be obtained.
[0054]
Next, a configuration example of a filter formed by combining another resonator with a multimode dielectric resonator device will be described with reference to FIG.
18A is a top view with the upper lid removed, and FIG. 18B is a cross-sectional view taken along the line BB in FIG. In FIG. 18, 20 is a five-mode resonator shown in FIG. 14, and 23 is a triple-mode resonator. Reference numeral 13 denotes a triple mode dielectric core, which is a low dielectric constant member supported at a predetermined height from the bottom of the cavity.
[0055]
Since the loop surface of the coupling loop 7a is directed to the x + y axis in the direction of 45 degrees obliquely with respect to the dielectric core 13, the coupling loop 7a is coupled to the TMx + y mode in which the electric field vector is oriented in the x + y axis direction. Further, since the loop surface of the coupling loop 7b is directed in the y-x axis direction, the coupling loop 7b is coupled with the TMy-x mode in which the electric field vector is oriented in the y-x axis direction. In addition, the dielectric core 13 is provided with coupling grooves 15a and 15b extending in a 45-degree direction at a predetermined depth, and 15a is provided at a portion where the electric field vectors of the TMy-x mode and the TEz mode overlap. This groove perturbs the distribution of both mode electric field strengths and couples them. Similarly, since the coupling groove 15b is provided in a portion where the electric field vectors of the TMx + y mode and the TEz mode are overlapped, perturbation is given to the distribution of the electric field strengths of both modes and the both are coupled. Therefore, TMx + y mode → TEz mode → TMy−x mode is coupled in order by this dielectric core 13 and acts as a three-stage resonator. Therefore, the entire apparatus shown in FIG. 18 functions as a filter having bandpass characteristics composed of eight stages of resonators.
[0056]
Next, a configuration example of the duplexer will be described with reference to FIG.
In FIG. 19, 20TX and 20RX are five-mode resonators similar to those shown in FIG. 14, and 23TX and 23RX are triple-mode resonators similar to those shown in FIG. The triple mode resonator 23TX and the quintuple mode resonator 20TX constitute a transmission filter portion. Similarly, the triple mode resonator 23RX and the quintuple mode resonator 20RX constitute a reception filter portion.
[0057]
One coupling loop 7b connected to the central conductor of the coaxial connector 5b is magnetically coupled to the triple mode resonator 23TX, and the other coupling loop 7c is magnetically coupled to the triple mode resonator 23RX. A transmission signal and a reception signal are branched. In this way, a duplexer as an antenna duplexer is configured.
[0058]
FIG. 20 is a block diagram showing a configuration of a communication apparatus using the duplexer. As described above, the transmission circuit is connected to the input port of the transmission filter, the reception circuit is connected to the output port of the reception filter, and the antenna is connected to the input / output port of the duplexer, thereby configuring the high-frequency unit of the communication device.
[0059]
【The invention's effect】
According to the present invention, by providing the TM mode resonance frequency adjustment protrusion at the end of the TM mode dielectric core where the TM mode electric field is concentrated, only the TM mode resonance frequency is independently increased, The resonance frequency of other modes can be prevented from being affected, and the characteristics can be easily designed or adjusted. Further, by adjusting the protrusion amount of the protrusion, a multi-mode dielectric resonator device in which the TM mode resonates at a predetermined frequency and the TM mode and the TE mode are coupled with a predetermined coupling amount can be obtained.
[0060]
Further, according to the present invention, when the protrusion is protruded in a direction substantially perpendicular to the plate-shaped surface of the TM mode dielectric core, the protrusion is cut to adjust the TM mode resonance frequency. The influence on is suppressed.
[0061]
Also, according to the present invention, the sensitivity of frequency adjustment with respect to the cutting amount can be increased by projecting the protrusion in a direction substantially parallel to the TM mode dielectric core plate-like surface.
[0062]
Further, according to the present invention, the protrusion amount of the protrusion in the direction perpendicular to the plate-shaped surface of the TM mode dielectric core is made asymmetric with respect to the plate-shaped surface of the TM mode dielectric core. The coupling amount between the TM mode and the TE mode can be adjusted.
[0063]
In addition, according to the present invention, a small-sized filter or duplexer using the multi-mode dielectric resonator device having a predetermined characteristic can be obtained.
[0064]
Furthermore, according to the present invention, a communication device exhibiting predetermined communication characteristics can be obtained using the multimode dielectric resonator device, filter or duplexer.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a basic part of a multimode dielectric resonator device according to a first embodiment.
FIG. 2 is a top view and a sectional view of the resonator device.
FIG. 3 is a view showing an electric field distribution in each mode of the resonator device.
FIG. 4 is a diagram showing a relationship between an electric field distribution and adjustment protrusions for two TM modes of the resonator device;
FIG. 5 is a perspective view showing a configuration of a basic part of a multimode dielectric resonator device according to a second embodiment.
FIG. 6 is a top view and a sectional view of the resonator device.
FIG. 7 is a diagram showing an electric field distribution in each mode of the resonator device.
FIG. 8 is a diagram showing a relationship between an electric field distribution and adjustment protrusions for two TM modes of the resonator device;
FIG. 9 is a perspective view of a dielectric core portion of a multimode dielectric resonator device according to a third embodiment.
FIG. 10 is a perspective view of a dielectric core portion of a multimode dielectric resonator device according to a fourth embodiment.
FIG. 11 is a diagram showing a relationship between an electric field distribution and adjustment protrusions for two TM modes of the resonator device;
FIG. 12 is a perspective view of a dielectric core portion of a multimode dielectric resonator device according to a fifth embodiment.
FIG. 13 is a diagram showing a relationship between an electric field distribution and adjustment protrusions for two TM modes of the resonator device;
FIG. 14 is a top view and cross-sectional view of a multimode dielectric resonator device according to a sixth embodiment.
FIG. 15 is a diagram showing the principle of coupling adjustment between TE modes;
FIG. 16 is a diagram showing a coupling state between the TE mode and the TM mode.
FIG. 17 is a diagram illustrating a configuration example of a filter using a semi-coaxial resonator and a five-mode resonator.
FIG. 18 is a diagram showing a configuration example of a filter using a triple mode resonator and a triple mode resonator.
FIG. 19 is a diagram illustrating a configuration example of a duplexer.
FIG. 20 is a block diagram illustrating a configuration of a communication device.
FIG. 21 is a diagram for explaining the relationship between a TM mode dielectric core portion and a TE mode dielectric core portion;
[Explanation of symbols]
2-cavity
3-support
4-probe
5-coaxial connector
6-lid
7-join loop
8-center conductor
9-Frequency adjustment screw
10-dielectric core
11-TM mode dielectric core
12-TE mode dielectric core part
13-3 double mode dielectric core
14-Coupling groove
15-joint groove
16-19-Adjusting protrusion
20-5 double mode resonator
21,22 semi-coaxial resonator
23-3 double mode resonator

Claims (8)

A dielectric core comprising: a TM mode dielectric core part that resonates at least one TM mode in a use frequency band; and a TE mode dielectric core part that resonates each TE mode of a multiple TE mode in a use frequency band. Is disposed in a cavity having conductivity, in a dielectric resonator device,
A multimode dielectric resonator device in which a protrusion is provided at an end of the TM mode dielectric core where the TM mode electric field is concentrated. 2. The multimode dielectric resonator device according to claim 1, wherein the TM mode dielectric core is formed in a plate shape, and the protrusion is projected in a direction substantially perpendicular to the plate surface. 2. The multimode dielectric resonator device according to claim 1, wherein the TM mode dielectric core is formed in a plate shape, and the protrusion protrudes in a direction substantially parallel to the plate surface. The protrusion amount of the protrusion in a direction perpendicular to the plate-like surface of the TM mode dielectric core is asymmetric with respect to the plate-like surface of the TM mode dielectric core. Multimode dielectric resonator device. 5. The resonance frequency of the TM mode or the TM mode by cutting the protrusion in the multimode dielectric resonator device according to claim 2, adjusting the protrusion amount of the protrusion. Adjustment method for multimode dielectric resonator device, which adjusts coupling between the TE mode and the TE mode. A filter using the multimode dielectric resonator device according to claim 1. A duplexer using the multimode dielectric resonator device according to claim 1. A communication device using the multimode dielectric resonator device according to claim 1, the filter according to claim 6, or the duplexer according to claim 7.

Images