JP2004312287A - Dielectric resonator, dielectric filter, composite dielectric filter, and communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dielectric resonator capable of adjusting a coupling amount between two resonance modes even in a decreasing direction, facilitating the adjustment of the coupling amount and enhancing an yield in manufacturing, and to provide a dielectric filter provided with the dielectric resonator, a composite dielectric filter and a communication apparatus. <P>SOLUTION: The dielectric resonator is characterized in that first and second missing parts 11a, 11b are provided to its ridges in parallel with each other and in a non-diagonal relation, also missing parts 11a', 11b' are provided to even its ridges at diagonal positions. The dielectric resonator is characterized by coupling two resonance modes (TE01δx mode and TE01δy mode) by a difference between volumes of the first and second missing parts. Then the dielectric resonator is characterized in that the coupling amount is decreasingly adjusted by expanding either of the missing parts 11b, 11b' which has a smaller volume. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a dielectric resonator operating in multiple modes, a dielectric filter including the same, a composite dielectric filter, and a communication device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a multi-mode dielectric resonator in which one dielectric block resonates in a plurality of resonance modes has been used (for example, Patent Document 1).
In the dielectric resonator disclosed in Patent Literature 1, an inclined plane is provided on at least a part of a ridge portion of a substantially rectangular parallelepiped dielectric block so that two resonance modes are coupled to each other.
[0003]
[Patent Document 1]
JP 2002-151906 A
[Problems to be solved by the invention]
In the case of the dielectric resonator disclosed in Patent Document 1, when an inclined plane having a chamfered shape is formed at a ridge formed by two adjacent surfaces intersecting, an electric field is applied in a direction parallel to the two adjacent surfaces. Are coupled to each other.
[0005]
However, whether the inclined plane is formed in advance by press molding of a dielectric resonator or formed by cutting after molding, the larger the inclined plane, that is, the larger the chamfer, the more the two resonance modes The amount of bonding between them increases. Therefore, the coupling amount can be adjusted only in a direction in which the coupling amount between the two resonance modes is increased. For this reason, when the inclined plane is formed too large, it is not possible to return to the predetermined coupling amount, so that there is a problem that the coupling amount adjustment is not easy. In other words, there is a problem in that a dielectric resonator in which the amount of coupling cannot be substantially adjusted cannot be formed, and it is difficult to increase the yield rate of the dielectric resonator when manufacturing the dielectric resonator.
[0006]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a dielectric resonator in which the above-mentioned problems are solved and the amount of coupling between two resonance modes can be adjusted in a decreasing direction, and a dielectric resonator having the adjustment is provided. It is an object of the present invention to provide a dielectric filter, a composite dielectric filter and a communication device provided with a filter.
[0007]
[Means for Solving the Problems]
The present invention relates to a TE01δ multi-mode dielectric resonator which is disposed in a cavity and has a substantially rectangular parallelepiped shape as a whole. The first and second missing portions are provided in the vicinity, and the volumes of the first and second missing portions are made different.
[0008]
With this structure, two resonance modes in which an electric field turns in parallel to two surfaces included in a portion intersecting one ridge are coupled to each other. The amount of coupling increases by increasing the volume of one of the first and second missing parts compared to the other, and the smaller the difference in volume between the first and second missing parts, the smaller the amount of coupling. Therefore, the coupling amount can be adjusted in a decreasing direction by increasing the missing amount of one of the missing portions so as to reduce the volume difference between the first and second missing portions.
[0009]
Further, in the present invention, a first notch is provided in two diagonals of the dielectric resonator or in the vicinity along the two ridges, and the first cavity is parallel to the two ridges. Characterized in that two ridges having a non-diagonal relationship to each other or a second notch is provided in the vicinity along the two ridges, and the volumes of the first and second notches are different. I have.
[0010]
According to this structure, the total volume of the missing portions for increasing or decreasing the coupling amount of the two resonance modes increases, so that the coupling amount can be adjusted over a wider range.
[0011]
Also, the present invention provides a method of manufacturing a semiconductor device according to the present invention, wherein a first virtual surface including two ridges parallel to each other and in a diagonal relationship with each other is intersected with a first virtual surface. A surface of the dielectric resonator intersecting a second virtual surface along a second virtual surface forming one groove and including the other two edges parallel to and diagonal to the two edges; The second groove is formed in the first groove, and the volumes of the first groove and the second groove are made different.
[0012]
In the case of this structure, a difference occurs in the frequency between one coupling mode in which the electric field rotates in the direction along the groove and the other coupling mode in which the electric field rotates in a direction perpendicular to the groove, and the two resonance modes are coupled. By increasing the volume of one of the first and second grooves compared to the other, the amount of coupling increases, and the smaller the difference in volume between the first and second grooves, the smaller the amount of coupling. Therefore, the coupling amount can be adjusted in a decreasing direction by increasing the missing amount of one of the grooves so as to reduce the volume difference between the first and second grooves.
[0013]
The present invention also provides a first virtual surface including two parallel and diagonal edges of the dielectric resonator, and two other diagonal edges different from the two edges. A first hole is provided along the first virtual surface at a position distant from the intersection with the second virtual surface, and a second hole is provided along the second virtual surface. The volume of the second hole is different from that of the second hole.
[0014]
With this structure, by making the volumes of the first hole and the second hole different, the frequencies of the two coupling modes in which the electric field turns along the two virtual planes are changed, and the two resonance modes are coupled. Then, by increasing one of the holes in the direction in which the difference in volume between the first hole and the second hole is reduced, the amount of coupling can be adjusted in the decreasing direction.
[0015]
Further, the present invention is characterized in that a dielectric filter is provided comprising the above-described dielectric resonator and external coupling means for externally coupling to the dielectric resonator.
[0016]
Further, the present invention is characterized in that a plurality of sets of the above-mentioned dielectric filters are provided, and a composite dielectric filter is constituted by sharing one external coupling means of each of the dielectric filters.
[0017]
Further, the present invention is characterized in that a communication device is configured by providing the above-mentioned dielectric filter or composite dielectric filter in a high-frequency circuit section.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
A dielectric resonator according to a first embodiment will be described with reference to FIGS.
FIG. 1 is an exploded perspective view showing a basic configuration of a dielectric resonator disposed in a cavity and a configuration of a main part of a dielectric resonator device including the same. In this example, the dielectric core 10 is arranged inside the cavity 1 to constitute a dielectric resonator device. The outer shape of the dielectric core 10 has a substantially cubic shape. This dielectric core 10 is joined to the support plate 3. As the support plate 3, a ceramic plate having a low dielectric constant and a linear expansion coefficient similar to that of the dielectric core 10 is used. The dielectric core 10 is bonded to the support plate 3 with an adhesive or bonded by baking glass grace.
[0019]
The cavity 1 is a metal molded body, and its inner surface has a substantially rectangular parallelepiped shape. A conductor film such as a silver electrode is formed on the inner and outer surfaces of the cavity. Four support columns 2 are arranged on the inner bottom surface of the cavity 1, and the support plate 3 is supported via the support columns 2. A cover is attached to the upper opening surface of the cavity 1.
[0020]
Thus, the dielectric resonator 10 is arranged at the center of the cavity 1. In the figure, a loop symbol symbolizes the shape of the electric field distribution of the three resonance modes generated in the dielectric resonator 10. That is, three resonance modes of a TE01δx mode in which an electric field rotates along a plane perpendicular to the x-axis, a TE01δy mode in which an electric field rotates along a plane perpendicular to the y-axis, and a TE01δz mode in which an electric field rotates along a plane perpendicular to the z-axis. Occurs. Of course, higher-order resonance modes of these resonance modes also occur, but here, the fundamental mode is used.
[0021]
2 to 4 show examples of the electromagnetic field distribution of the above three resonance modes. 2 shows the TE01δx mode, FIG. 3 shows the TE01δy mode, and FIG. 4 shows the TE01δz mode. In these figures, solid arrows represent lines of electric force, and broken arrows represent lines of magnetic force. The cavities are omitted in these figures as in the case of FIG.
[0022]
In the examples shown in FIGS. 1 to 4, if the dielectric resonator 10 has a cubic shape, the electromagnetic field distributions of the three resonance modes are orthogonal to each other, so that they are independent. The resonance frequencies of the three resonance modes are equal. The following configuration is used to couple two resonance modes out of the three resonance modes.
[0023]
FIG. 5A shows the directions in which the electric fields of the TE01δx mode and the TE01δy mode rotate in a plane. (B) shows the directions in which the electric fields of the TE01δx + y mode (even mode) and the TE01δx-y mode (odd mode), which are coupling modes of the two resonance modes, rotate.
[0024]
FIG. 6 shows the structure of a dielectric resonator in which the coupling amount between the two resonance modes TE01δx mode and TE01δy mode is determined. In the example shown in FIG. 6A, a tapered notch 11a is formed at a ridge formed by the intersection of two adjacent main surfaces Sx and Sy. The missing portion 11a relatively increases the frequency of one TE01δx + y mode of the two coupling modes shown in FIG. 5B as compared with the frequency of the other TE01δx-y mode. A difference occurs in the frequency of the coupling mode, and coupling occurs between the TE01δx mode and the TE01δy mode.
[0025]
As the volume of the missing portion 11a (the volume of the missing portion considered to be subtracted from the basic shape shown in FIG. 1) increases, the frequency difference between the two coupling modes increases, and the coupling between the two resonance modes increases. The amount increases.
[0026]
In the structure shown in FIG. 6B, a tapered notch 11a is formed at a ridge formed by the intersection of two adjacent main surfaces Sx and Sy, and the tapered cutout 11a is formed at a non-diagonal position and parallel to the ridge. Other tapered portions 11b are also formed at other ridges. The missing portion 11b acts in a direction to increase the frequency of the TE01δx-y mode shown in FIG. That is, it acts in a direction to cancel the action of the missing portion 11a. Therefore, after the amount of coupling between the TE01δx mode and the TE01δy mode is determined by the first missing portion 11a, and when the amount of coupling is reduced, the volume of the missing portion 11b is reduced by providing the second missing portion 11b. By increasing, the amount of coupling can be determined in a decreasing direction.
[0027]
In the example shown in FIG. 6C, another first missing portion 11a 'is formed at the diagonal ridge of the first missing portion 11a. Similarly, another second missing portion 11b 'is formed at a diagonal position of the second missing portion 11b.
[0028]
The first missing portions 11a and 11a 'act in the direction of increasing the frequency of the TE01δx + y mode shown in FIG. 5B, and the second missing portions 11b and 11b' increase the frequency of the TE01δx-y mode. Acts in the direction. Accordingly, as in the case of the dielectric resonator having the structure shown in FIG. 6B, when the volume of one of the first and second missing portions is increased, two resonance modes (TE01δx mode, Under the condition that the coupling amount of the TE01δy mode increases, the coupling amount can be adjusted in the decreasing direction by increasing the volume of the other missing portion. In particular, as shown in FIG. 6C, if the missing portions are provided so as to form a pair at diagonal positions, the total volume of the missing portions can be increased without greatly changing the shape of the entire dielectric resonator. The setting and adjustment of the coupling amount can be performed over a wide range.
[0029]
Next, a dielectric resonator according to a second embodiment will be described with reference to FIGS.
In the example shown in FIG. 7, a tapered notch 11a is formed at a ridge formed by the adjacent main surfaces Sx and Sy of the dielectric resonator 10 intersecting with each other, and is parallel to the ridge formed with the notch 11a. A notch 11b is formed at the ridge at the non-diagonal position. The missing portions 11a and 11b are the same as those shown in FIG. In the example of FIG. 7, a tapered notch 12a is formed on a ridge formed by the intersection of the adjacent main surfaces Sx and Sz, and a ridge that is parallel to the ridge formed with the notch 12a and that is at a non-diagonal position. Is formed with a missing portion 12b.
[0030]
The missing portions 11a and 11b determine the amount of coupling between the TE01δx mode and the TE01δy mode as in the case of the first embodiment. The missing portions 12a and 12b determine the amount of coupling between the TE01δx mode and the TE01δz mode. That is, if there is a difference between the capacities of the missing portions 12a and 12b, a difference occurs between the frequencies of the two coupled modes of the TE01δx mode and the TE01δz mode, and the two modes (TE01δx mode and TE01δz mode) are coupled. When the difference between the volumes of the missing portions 12a and 12b is reduced, the amount of coupling decreases. For example, by increasing the volume of the missing portion 12b while the volume of the missing portion 12a is larger than the volume of 12b, the amount of coupling is reduced. It can be adjusted in the decreasing direction.
[0031]
In the example shown in FIG. 8, the missing portions are formed at the diagonal ridges of the missing portions 11a, 11b, 12a, and 12b shown in FIG. Therefore, similarly to the case shown in FIG. 6C, the missing portions 11a and 11a 'act in the same direction as the coupling amount between the TE01.delta.x mode and the TE01.delta.y mode, and the missing portions 11b and 11b' also have the TE01.delta.x Acts in the same direction on the increase and decrease of the coupling amount between the mode and the TE01δy mode. The missing portions 12a and 12a 'act in the same direction with respect to the increase or decrease in the coupling amount between the TE01δx mode and the TE01δz mode, and the missing portions 12b and 12b' also act on the increase or decrease in the coupling amount between the TE01δx mode and the TE01δz mode. Acts in the same direction. According to such a structure, the amount of increase or decrease of the coupling amount between the two resonance modes can be increased, and the occurrence of spurious can be suppressed since the symmetry of the dielectric resonator 10 is not largely broken. it can.
[0032]
Next, a dielectric resonator according to a third embodiment will be described with reference to FIGS.
In the example shown in FIG. 9A, a step-shaped or V-shaped cutout 11a is formed at a ridge formed by the intersection of two adjacent main surfaces Sx and Sy of the dielectric resonator 10. Is shown. Even if the missing portion has such a shape, the two resonance modes (TE01δx, TE01δy) are coupled. Therefore, if the stepped or V-shaped cross section 11b is formed at the ridge at the non-diagonal position parallel to the ridge forming the cut 11a, the volume of the cut 11b becomes the volume of the cut 11a. By expanding the missing portion 11b in a smaller state, the amount of coupling between the two resonance modes can be adjusted in a decreasing direction.
[0033]
Similarly, as shown in FIG. 9B, the notches 11a 'and 11b' may be formed on the ridges which are diagonally opposite to the ridges where the notches 11a and 11b are formed. This structure has the same effect as the case shown in FIG.
[0034]
FIG. 10 shows a dielectric resonator having the structure shown in FIG. 7 in which the shape of the missing portion is replaced with a step-like or V-shaped cross section. Even in such a structure, the coupling amount between two resonance modes can be arbitrarily determined among the three resonance modes orthogonal to each other, as in the case of FIG.
[0035]
In the example shown in FIG. 11, each of the missing portions 11a, 11b, 12a, and 12b has a U-shaped cross section. That is, a groove having a U-shaped cross section is formed at a predetermined ridge. Even with such a structure, the same operation and effect as in the case of FIGS. 7 and 10 can be obtained.
[0036]
Next, a dielectric resonator according to a fourth embodiment will be described with reference to FIGS.
In each of the first to third embodiments, a cutout is formed at the ridge of the dielectric resonator 10, but in the fourth embodiment, a cross section is formed near the ridge as shown in FIG. A U-shaped groove is formed. When the missing portion is provided in the vicinity of the ridge as described above, one of the two coupling modes depending on the resonance mode to be coupled acts to increase or decrease one of the resonance frequencies. The amount of binding can be adjusted in the same manner as in the case. FIG. 12A shows an example in which the missing portion 11b is formed at a position symmetrical with respect to the line 11a. (B) is an example in which the missing portion 11b is formed at a 90 ° rotationally symmetric position with respect to 11a. (C) forms missing portions 11a 'and 11b' which form a pair at diagonal positions (180 ° rotationally symmetric positions) with respect to the missing portions 11a and 11b.
[0037]
FIG. 13 shows a configuration in which the cutouts 11a, 11b, 12a, and 12b shown in FIG. 7 are respectively replaced with U-shaped grooves, and the grooves are formed along the ridge and near the ridge. However, in this example, the missing portions 12a and 12b are arranged below in the figure. With such a structure, the same operation and effect as the case shown in FIG. 7 can be obtained.
[0038]
Next, a dielectric resonator according to a fifth embodiment will be described with reference to FIG.
In the example shown in FIG. 14A, the dielectric resonator 10 is positioned along a virtual plane including two parallel and diagonal ridges E4 and a diagonal ridge. The first groove 13a is formed on the upper surface. Similarly, a second groove 13b is formed on the upper surface of the dielectric resonator 10 along an imaginary plane including two ridges E1 and E3 that are parallel and diagonal to each other.
As shown in FIG. 5B, the first groove 13a acts to increase the frequency of TE01δx + y, and the second groove 13b changes the frequency of TE01δx-y mode, which is another coupling mode. Acts in the direction of ascending. Therefore, the TE01δx mode and the TE01δy mode can be combined by making the volumes of the first groove 13a and the second groove 13b different. If, for example, the first groove 13a is formed deeper (or wider) than the second groove 13b, the coupling amount between the two resonance modes increases as the second groove 13b becomes deeper (or wider). Can be adjusted in the decreasing direction.
[0039]
The example shown in FIG. 14B shows an example in which the length of the first groove 13a and the second groove 13b is reduced so that the first groove 13a and the second groove 13b are formed so as not to reach the corners of the dielectric resonator. . According to such a structure, the volume of the first and second grooves 13a and 13b can be adjusted not only by the depth and width of the grooves but also by the length.
[0040]
Next, a dielectric resonator according to a sixth embodiment will be described with reference to FIGS.
In the example shown in FIG. 15A, the first hole 15a is formed along a virtual plane VS1 including two parallel and diagonal edges E1 and E3 and at a position away from the center of the virtual plane VS1. Has formed. Further, a second hole 15b is provided along the virtual plane VS2 including the ridge E4 and another ridge parallel to and diagonal to the east E4 and at a position away from the center of the imaginary plane VS2. As is clear from the relationship shown in FIG. 5B, the first hole 15a acts to increase the frequency of the TE01δx-y mode, and the second hole 15b acts to increase the frequency of the TE01δx + y mode. Act on. Therefore, when the dielectric resonator 10 is symmetrical with respect to the TE01δx + y mode and the TE01δx-y mode, if there is a difference between the volumes of the first hole 15a and the second hole 15b, two resonance modes (TE01δx, TE01δy) combine with each other. Then, while the volume of the first hole 15a is larger than the volume of the second hole 15b, the amount of coupling between the two resonance modes is adjusted in a decreasing direction by expanding the second hole 15b. be able to.
[0041]
In the example shown in FIG. 15B, the first groove 15a, 15a 'is provided at a position substantially symmetric with respect to a line formed by the intersection of the two virtual surfaces VS1 and VS2, and the second groove is similarly formed. 15b and 15b 'are provided. According to this structure, the adjustment range of the coupling amount between the two resonance modes can be expanded. In addition, since the symmetry of the dielectric resonator 10 is not largely broken, spurious generation can be suppressed.
[0042]
FIG. 16 shows an example in which coupling between two sets of three resonance modes generated in the dielectric resonator 10 is achieved. The structure in which the holes 15a, 15a ', 15b, 15b' are formed along the virtual planes VS1, VS2 is the same as that of FIG. Similarly, the first holes 16a and 16a 'are provided along the virtual plane VS3, and the second holes 16b and 16b' are provided along the virtual plane VS4. Therefore, the coupling amount between the TE01δz mode and the TE01δy mode can be determined by these holes 16a, 16a ′, 16b, 16b ′.
[0043]
Next, a configuration of a dielectric filter according to a seventh embodiment will be described with reference to FIG.
FIG. 17 shows the positional relationship between the dielectric resonator in the cavity and the coupling loop coupled thereto. This dielectric resonator 10 is the same as the dielectric resonator shown in FIG. The cavity is omitted in the figure. One end of each of the coupling loops Ky and Kz is connected to the center conductor of the coaxial connector attached to the cavity, and the other end is connected to the inner surface of the cavity. The coupling loop Ky points its loop plane to the xz plane. The coupling loop Kz has its loop plane oriented in the xy plane. Therefore, the coupling loop Ky magnetically couples to the TE01δy mode, and the coupling loop Kz magnetically couples to the TE01δz mode.
[0044]
As already described with reference to FIG. 7, since the TE01δx mode is coupled to the TE01δy mode and also to the TE01δz mode, the TE01δy mode resonator → TE01δx mode resonator → TE01δz mode is provided between the two coupling loops Ky and Kz. There are equivalently three resonators coupled in the order of the resonators. As a result, a filter having band-pass filter characteristics composed of three stages of resonators can be configured.
[0045]
Next, the configurations of the composite dielectric filter and the communication device according to the eighth embodiment are shown in FIG.
Here, the duplexer includes a transmission filter and a reception filter. Each of the transmission filter and the reception filter is a filter having the above-described configuration. The phase adjustment is performed between the output port of the transmission filter and the input port of the reception filter so that the transmission signal does not go to the reception filter side and the reception signal does not go to the transmission filter side. A transmission circuit is connected to a transmission signal input port of the duplexer, and a reception circuit is connected to a reception signal output port. An antenna is connected to the antenna port. Thus, a communication device including the dielectric resonator according to the present invention is configured.
[0046]
【The invention's effect】
According to the present invention, the coupling amount can be increased by increasing one of the ridges of the dielectric resonator that are parallel and non-diagonal to each other or the first and second cutouts provided near the ridges. Can be adjusted in the decreasing direction. Therefore, the amount of coupling can be easily adjusted, and the yield rate at the time of manufacturing the dielectric resonator can be improved.
[0047]
Further, according to the present invention, the first notch is provided at or near two diagonal portions of the dielectric resonator in a diagonal relationship, and the first notch portion is provided with respect to the two ridge portions. The total volume of the missing portions for increasing or decreasing the coupling amount of the two resonance modes by providing two parallel and non-diagonal ridges or a second missing portion near the two ridges. , The amount of coupling can be adjusted over a wider range.
[0048]
Further, according to the present invention, along the first virtual plane including two parallel and diagonal ridges of the dielectric resonator, the dielectric resonator intersects the first virtual plane with the first virtual plane. A first groove is formed on a surface of the dielectric resonator which intersects the second virtual surface along a second virtual surface including the other two edges parallel to the two edges and in a diagonal relationship with each other. Since two grooves are formed, if one of the first and second grooves is increased, the amount of coupling can be adjusted in a decreasing direction. Therefore, the amount of coupling can be easily adjusted, and the yield rate at the time of manufacturing the dielectric resonator can be improved.
[0049]
Further, according to the present invention, a first hole is provided along the first virtual surface and at a position away from a central portion of the first virtual surface, and along the second virtual surface, In addition, since the second hole is provided at a position distant from the center of the virtual surface, if one of the first and second holes is increased, the amount of coupling can be adjusted in a decreasing direction. Therefore, the amount of coupling can be easily adjusted, and the yield rate at the time of manufacturing the dielectric resonator can be improved.
[0050]
Further, according to the present invention, a dielectric filter having desired band-pass characteristics and a composite dielectric filter having the above-described dielectric resonator device and external coupling means externally coupled thereto can be easily obtained.
[0051]
Further, according to the present invention, a low-cost communication device can be configured by providing the above-described dielectric filter or composite dielectric filter in a high-frequency circuit unit.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a basic structure of a dielectric resonator according to a first embodiment. FIG. 2 is a diagram showing an electromagnetic field distribution in a TE01δx mode. FIG. 3 is a diagram showing an electromagnetic field distribution in a TE01δy mode. FIG. 4 is a diagram showing an electromagnetic field distribution of a TE01δz mode; FIG. 5 is a diagram showing directions of electric fields of two resonance modes and a coupling mode thereof; FIG. 6 is a diagram showing a structure for coupling two resonance modes; FIG. 7 is a perspective view of a dielectric resonator according to a second embodiment; FIG. 8 is a perspective view of a dielectric resonator having a different structure according to the second embodiment; FIG. FIG. 10 is a perspective view of a dielectric resonator having another structure according to the third embodiment. FIG. 11 is a perspective view of a dielectric resonator having another structure according to the third embodiment. FIG. 12 is a perspective view of a dielectric resonator according to a fourth embodiment. FIG. 14 is a perspective view of a dielectric resonator having another structure. FIG. 14 is a perspective view of a dielectric resonator according to a fifth embodiment. FIG. 15 is a perspective view of a dielectric resonator according to a sixth embodiment. FIG. 17 is a perspective view of a dielectric resonator having a different structure according to the sixth embodiment. FIG. 17 is a perspective view showing a configuration of a main part of a dielectric filter according to a seventh embodiment. The figure which shows the structure of such a composite dielectric filter and a communication apparatus.
10-dielectric resonators 11a, 11a ', 12a, 12a'-first missing parts 11b, 11b', 12b, 12b'-second missing parts 13a-first grooves 13b-second grooves 15a, 15a ', 16a, 16a'-first holes 15b, 15b', 16b, 16b'-second holes Sx, Sy-principal surfaces E1-E4-ridges VS1, VS2-virtual surfaces Ky of dielectric resonators Kz-coupled loop

Claims (7)

In a TE01δ multi-mode dielectric resonator which is disposed in a cavity and has a substantially rectangular parallelepiped shape as a whole,
First and second cutouts are provided near or along the ridges of the dielectric resonator that are parallel and non-diagonal to each other, and the volumes of the first and second cutouts are different. A dielectric resonator characterized in that: In a TE01δ multimode dielectric resonator having a substantially rectangular parallelepiped shape, which is disposed in the cavity,
Two diagonals of the dielectric resonator are provided or a first missing portion is provided in the vicinity along the two ridges, and the first cavity is parallel to the two ridges and has a non-diagonal relationship with each other. A dielectric resonator characterized in that a second notch is provided near or along two ridges, and the first and second notches have different volumes. In a TE01δ multi-mode dielectric resonator which is disposed in a cavity and has a substantially rectangular parallelepiped shape as a whole,
Forming a first groove on a surface of the dielectric resonator that intersects the first virtual surface along a first virtual surface including two parallel and diagonal edges of the dielectric resonator; A second groove is formed in a surface of the dielectric resonator that intersects a second virtual surface along a second virtual surface including the other two edges parallel to the two edges and in a diagonal relationship with each other. A dielectric resonator, wherein the first groove and the second groove have different volumes. In a TE01δ multimode dielectric resonator having a substantially rectangular parallelepiped shape, which is disposed in the cavity,
A first virtual surface including two parallel and diagonal edges of the dielectric resonator, and a second virtual surface including other two edges diagonally different from each other and different from the two edges. A first hole is provided along a first virtual surface at a position distant from the intersection with the surface, a second hole is provided along a second virtual surface, and the first hole and the second hole are provided. A dielectric resonator characterized in that holes have different volumes. A dielectric filter comprising: the dielectric resonator according to claim 1; and external coupling means externally coupled to the dielectric resonator. A composite dielectric filter comprising a plurality of sets of the dielectric filters according to claim 5 and sharing one external coupling means of each of the dielectric filters. A communication device comprising the dielectric filter according to claim 5 or the composite dielectric filter according to claim 6 in a high-frequency circuit unit.

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