WO2017113222A1 - Tm mode dielectric filter, and communication radio frequency device - Google Patents

Abstract

The present invention provides a TM mode dielectric filter and a communication radio frequency device. The TM mode dielectric filter comprises a cavity, a cover plate, and at least two dielectric resonators provided in the cavity. The cover plate covers the cavity, the dielectric resonators are separated by a partition wall to form respective resonant cavities, the partition wall between at least two adjacent resonant cavities is provided with a coupling slot, and the coupling slot is provided with a coupling. The coupling comprises a first coupling portion, a second coupling portion, and a connection portion. Both ends of the connection portion are respectively connected to the first coupling portion and the second coupling portion, the connection portion passes through the coupling slot, and the first coupling portion and the second coupling portion are disposed respectively in the adjacent resonant cavities. The first coupling portion and the second coupling portion both have a ring structure, a plane where the ring structures are located is parallel to an electric field direction of the dielectric resonators, and the ring structure of both the first coupling portion and the second coupling portion is provided with a gap interrupting the ring structure. The TM mode dielectric filter of the invention can establish capacitive coupling and transfer stronger electric field energy.

Description

TM mode dielectric filter and communication RF device

[Technical Field]

The present invention relates to the field of signal processing technologies, and in particular, to a TM mode dielectric filter and a communication radio frequency device.

 【Background technique】

With the increasing demand for high reliability and miniaturization of devices, the use of dielectric resonators has begun to become more frequent. In the process of designing the filter, in order to meet the electrical performance requirements of the filter, it is sometimes necessary to add a capacitive coupling structure to the circuit structure. The commonly used capacitive coupling structure between metal dielectric resonators is to open a gap between two dielectric resonators and suspend a metal coupling rod fixed by a dielectric material (generally engineering plastic) to realize electric field energy of the two dielectric resonators. Pass.

Due to the particularity of the TM mode dielectric resonator, when the upper and lower sides of the dielectric resonator are in contact with the cavity, the electric field energy is mainly concentrated inside the dielectric resonator, and the electric field distribution of the common metal dielectric resonator is mainly concentrated in the dielectric resonator and the cavity. between. Therefore, the use of a capacitive coupling structure commonly used in metal dielectric resonators between TM mode dielectric resonators cannot effectively lead the current to complete the transmission of electric field energy. As shown in FIG. 1 and FIG. 2, FIG. 1 is a schematic diagram of a commonly used metal capacitive coupling cross structure applied to a TM mode dielectric resonator; FIG. 2 is a simulation of a common metal capacitive coupling component applied to a TM mode dielectric resonator. The result is schematic. The capacitive coupling structure of the commonly used metal dielectric resonator is a metal coupling rod 2, and the coupling rod 2 is suspended between two TM mode dielectric resonators 1. The simulation shows that the coupling bandwidth between the two dielectric resonators 1 is 4.19. MHz, no capacitive coupling.

Therefore, when the capacitive coupling structure of a commonly used dielectric resonator is used in a TM mode dielectric resonator, the transmitted electric field energy is weak or cannot be capacitively coupled, and the electrical performance requirements of the filter cannot be satisfied.

 [Summary of the Invention]

The present invention provides a TM mode dielectric filter and a communication radio frequency device, which can solve the problem that the electric field energy transmitted by the prior art capacitive coupling structure is weak or cannot be capacitively coupled when used in a TM mode dielectric resonator.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide a TM mode dielectric filter including a cavity, a cover plate, and at least two dielectric resonators disposed in the cavity. The cover cover cavity, the dielectric resonators are separated by a partition wall to form respective resonant cavities, and the partition wall between at least two adjacent resonant cavities is coupled a coupling slot is disposed on the coupling slot; the coupling member includes a first coupling portion, a second coupling portion, and an engaging portion, and the two ends of the engaging portion are respectively connected to the first coupling portion and the a second coupling portion, the engaging portion penetrating the coupling card slot, the first coupling portion and the second coupling portion are respectively disposed in two adjacent resonant cavities, the first coupling portion and The second coupling portions are all annular structures, and the plane of the annular structure is parallel to the electric field direction of the dielectric resonator, and the annular structures of the first coupling portion and the second coupling portion are both A notch is provided which breaks the annular structure.

The plane where the first coupling portion is located and the plane where the second coupling portion are located are the same plane.

Wherein, the annular structure has a rectangular shape or an elliptical shape.

The filter further includes a card holder, and the card holder has an interference fit with the coupling card slot to fix the card holder to the coupling card slot; the top of the card holder is provided with The engaging portion has an interference fit mounting groove to fix both sides of the engaging portion to the card seat.

Wherein, the bottom of the connection portion of the connecting portion and the first coupling portion and the second coupling portion protrudes to form an engaging portion, and the engaging portion is clamped on the card seat to fix the The position of the first coupling portion and the second coupling portion in the resonant cavity.

The coupling card slot includes a card slot bottom wall and two mutually symmetric card slot sidewalls, and the card slot sidewall and the partition wall connected to the two sides of the card slot sidewall form a fixing portion; The card seat has a cross-section in a "work" shape, including a first end portion, a second end portion, and a connecting portion connected between the first end portion and the second end portion; the first end portion The first coupling portion is located in the same resonant cavity; the second end portion and the second coupling portion are located in the same resonant cavity; the mounting groove extends through the first end portion, the connecting portion and the a second end portion; the coupling card slot is interference fit with the connecting portion to fix both sides of the connecting portion; A fixing groove is formed between the first end portion and the second end portion, and the fixing groove is interference-fitted with the fixing portion to fix both ends of the card seat.

Wherein the length of the connecting portion is consistent with the length of the mounting groove.

The surface of the coupling card slot that contacts the card holder and the surface of the partition wall that contacts the card holder are both planar.

Wherein, the fixing groove and the coupling card slot are square grooves, and the fixing portion is a square fixing portion.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a communication radio frequency device including the above-described TM mode dielectric filter.

The beneficial effect of the present invention is that the TM mode dielectric filter of the present invention has the first coupling portion and the second coupling portion of the coupling member as an annular structure, and the plane of the annular structure and the electric field direction of the dielectric resonator Parallel, and a notch is formed in the annular structure, the notch breaks the annular structure to form a non-closed ring, and the coupling member of the structure can perturb the electric field at the top and bottom of the dielectric resonator, and can extract the medium. The electric field at the top and bottom of the resonator forms a strong electric field circulation inside and outside the "ring" of the annular structure of the first coupling portion and the second coupling portion, and the formed annular current conducts electric field energy, thereby It can produce capacitive coupling and can transmit strong electric field energy.

 [Description of the Drawings]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

1 is a schematic view of a conventional metal capacitive coupling member applied to a TM mode dielectric filter;

2 is a schematic diagram showing simulation results of a conventional metal capacitive coupling member applied to a TM mode dielectric filter;

3 is a schematic structural view of an embodiment of a TM mode dielectric filter of the present invention, showing a structure after mounting a coupling member;

4 is a schematic structural view of an embodiment of a coupling member of a TM mode dielectric filter of the present invention;

5 is a schematic structural view of an embodiment of a card holder in a TM mode dielectric filter of the present invention;

6 is a schematic structural view of an embodiment of a TM mode dielectric filter of the present invention, showing a structure when a coupling member is not mounted;

7 is a schematic diagram showing simulation results of a TM mode dielectric filter of the present invention;

Figure 8 is a block diagram showing the structure of a communication radio frequency device of the present invention.

【detailed description】

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The present invention provides a TM mode dielectric filter including a cavity, a cover plate, and at least two dielectric resonators disposed in the cavity, the cover capping cavity, and the dielectric resonators are isolated The walls are spaced apart to form respective resonant cavities, and the partition wall between the at least two adjacent resonant cavities is provided with a coupling card slot, and the coupling card slot is provided with a coupling member; the coupling member comprises a first coupling portion and a second coupling portion And a connecting portion, the two ends of the connecting portion are respectively connected to the first coupling portion and the second coupling portion, the engaging portion penetrating the coupling card slot, and the first coupling portion and the second coupling portion are respectively disposed in the adjacent two resonant cavities The first coupling portion and the second coupling portion are both annular structures, and the plane of the annular structure is parallel to the electric field direction of the dielectric resonator, and the annular structure of the first coupling portion and the second coupling portion are provided with a gap. The notch breaks the ring structure.

Specifically, the plane where the first coupling portion is located and the plane where the second coupling portion are located are the same plane. The ring structure is rectangular or elliptical.

The filter further includes a card holder, and the card holder and the coupling card slot have an interference fit to fix the card holder to the coupling card slot. The top of the card holder is provided with a mounting groove that is in an interference fit with the engaging portion to fix the two sides of the engaging portion to the card holder. a bottom portion of the connection portion of the connecting portion and the first coupling portion and the second coupling portion protrudes to form a latching portion, and the engaging portion is clamped on the card seat to fix the first coupling portion and the second coupling portion in the resonant cavity s position.

Specifically, the coupling card slot includes a card slot bottom wall and two mutually symmetric card slot sidewalls, and the card slot sidewall and the partition wall connected to the two sides of the card slot sidewall form a fixing portion. The card seat has a cross-section in the shape of a "work", including a first end, a second end, and a connection between the first end and the second end. The first end portion is located in the same resonant cavity as the first coupling portion. The second end portion and the second coupling portion are located in the same resonant cavity. The mounting groove extends through the first end, the connecting portion, and the second end. The coupling card slot is interference-fitted with the connecting portion to fix both sides of the connecting portion. A fixing groove is formed between the first end portion and the second end portion, and the fixing groove is interference-fitted with the fixing portion to fix both ends of the card seat. The length of the joint is the same as the length of the mounting groove. The surface of the coupling card slot that contacts the card holder and the surface of the partition wall that contacts the card holder are both planar. Specifically, the fixing groove and the coupling card slot are square grooves, and the fixing portion is a square fixing portion.

The invention will be described in detail below with reference to the drawings and specific embodiments.

Please refer to FIG. 3 and FIG. 4. FIG. 3 is a schematic structural diagram of an embodiment of a TM mode dielectric filter of the present invention. 4 is a schematic structural view of an embodiment of a coupling member of a TM mode dielectric filter of the present invention.

The present invention provides a TM mode dielectric filter comprising a cavity (not shown), a cover plate (not shown), and at least two dielectric resonators 10 disposed in the cavity, wherein the cover plate is used for capping In the present embodiment, the cavity and the dielectric resonator 10 are integrally formed by machining or die casting. Of course, the dielectric resonator 10 can also be fixed in the cavity by screws. The dielectric resonators 10 are separated by a partition wall 21 to form respective resonant cavities 20, and the partition wall 21 between at least two adjacent resonant cavities 20 is provided with a coupling card slot 30, and the coupling card slot 30 is provided Coupling member 40.

As shown in FIG. 4 , the coupling member 40 includes a first coupling portion 41 , a second coupling portion 42 , and an engaging portion 43 . The two ends of the engaging portion 43 are respectively connected to the first coupling portion 41 and the second coupling portion 42 . The first coupling portion 41 and the second coupling portion 42 are respectively disposed in the adjacent two resonant cavities 20, and the first coupling portion 41 and the second coupling portion 42 are both annular structures, and the annular structure is located. The plane is parallel to the direction of the electric field of the dielectric resonator 10. For example, in Fig. 3, the direction of the electric field of the dielectric resonator 10 of the present embodiment is a vertical direction, and thus, the plane in which the annular structure is located is a vertical plane. A notch 44 is provided in the annular structure of the first coupling portion 41 and the second coupling portion 42, and the notch 44 breaks the annular structure.

The annular structure of the first coupling portion 41 and the second coupling portion 42 in this embodiment is an ear-shaped structure, and the ear-shaped structure can prevent the coupling member 40 from being shaken between the two resonant cavities 20. The notch 44 in the annular structure causes the first coupling portion 41 and the second coupling portion 42 to perturb the electric field at the top and bottom of the dielectric resonator 10 to form an electric field circulation on the inner side and the outer side of the annular structure, thereby performing electric field energy. Pass.

Different from the prior art, the TM mode dielectric filter of the present invention has an annular structure by the first coupling portion 41 and the second coupling portion 42 of the coupling member 40, and the plane of the annular structure and the electric field of the dielectric resonator 10 The directions are parallel and a notch is formed in the annular structure, the notch breaking the annular structure to form a non-closed loop, and the coupling member 40 of the structure can perturb the electric field at the top and bottom of the dielectric resonator 10, The electric field at the top and bottom of the dielectric resonator 10 can be extracted, and a strong electric field circulation is formed on the inner side and the outer side of the "ring" of the annular structure of the first coupling portion 41 and the second coupling portion 42, and a ring current pair is formed. The electric field energy conducts, so it can produce capacitive coupling and can transmit strong electric field energy.

In this embodiment, the plane where the first coupling portion 41 is located and the plane where the second occasion portion 42 are located are the same plane. Of course, in other embodiments, an angle may be formed between the plane where the first coupling portion 41 is located and the plane where the second coupling portion 42 is located, or the plane where the first coupling portion 41 is located and the second coupling portion 42 are located. The planes can also be parallel to each other.

Specifically, in the present embodiment, the annular structure has a rectangular shape, and the notch 44 is provided on the side of the rectangular shape adjacent to the coupling card slot 30. Of course, in other embodiments, the annular structure may also be an elliptical ring or a circular shape.

The first coupling portion 41 and the second coupling portion 42 in the embodiment are symmetrical with each other, so that the processing of the coupling member 40 is easier, the mass production is convenient, the material is simple, the controllability of the tolerance is high, and the production precision is more Guarantee.

Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of a card holder in the TM mode dielectric filter of the present invention. The filter further includes a card holder 50. The card holder 50 is interference-fitted with the coupling card slot 30 to fasten the card holder 50 to the coupling card slot 30. The top of the card holder 50 is provided with a mounting groove 51 that is in interference fit with the engaging portion 43 to fix the two sides of the engaging portion 43 to the card holder 50. The card holder 50 is usually a plastic card holder, so that the card holder 50 has a slight elasticity. When the engaging portion 43 is pressed into the mounting groove 51, the card holder 50 is elastically deformed, so that the engaging portion 43 can be smoothly installed, when the engaging portion 43 is engaged. After being pressed into the mounting groove 51, the deformation of the cartridge 50 is restored, so that the cartridge 50 grips the engaging portion 43 tighter, so that the fixing of the engaging portion 43 by the cartridge 50 is more secure. In this embodiment, the cover body is also used to press the card holder 50 to prevent the card holder 50 from shaking up and down to ensure that the position of the card holder 50 and the coupling member 40 is more fixed. c

Since the distance between the coupling member 40 and the dielectric resonator 10 affects the capacitive coupling strength, in the present embodiment, the length of the engaging portion 43 coincides with the length of the mounting groove 51, and the first coupling is performed at the engaging portion 43. The bottom portion of the joint portion of the portion 41 and the second coupling portion 42 protrudes to form a engaging portion 46, and the engaging portion 46 is clamped on the card holder 50 to fix the first coupling portion 41 and the second coupling portion 42 in the resonant cavity. 20 in the position. The clamping of the card holder 50 by the engaging portion 46 causes the entire coupling member 40 to be fixed to the card holder 50, so that the position of the coupling member 40 is fixed, so that the coupling member 40 does not sway in the mounting groove 51. Shaking does not occur in the two resonant cavities 20, thereby maintaining a fixed distance between the first coupling portion 41 and the second coupling portion 42 and the dielectric resonator 10, thereby preventing the first coupling portion 41 and the second coupling portion 42 from being prevented. The distance between the dielectric resonator 10 and the dielectric resonator 10 changes to affect the capacitive coupling strength.

3 and FIG. 6, FIG. 6 is a schematic structural view of an embodiment of the TM mode dielectric filter of the present invention, showing the structure when the coupling member is not mounted. The coupling card slot 30 includes a card slot bottom wall 31 and two mutually symmetric card slot side walls 32. The card slot side wall 32 and the partition wall 21 connected to the two sides of the card slot side wall 32 define a fixing portion 33.

Referring to FIG. 3 and FIG. 5, in the embodiment, the card holder 50 has a cross-section in an "I" shape, including a first end portion 52, a second end portion 53, and a first end portion 52 and a second end. The connecting portion 54 between the portions 53.

The first end portion 52 is located in the same resonant cavity 20 as the first coupling portion 41. The second end portion 53 and the second coupling portion 42 are located in the same resonant cavity 20.

The mounting groove 51 extends through the first end portion 52, the connecting portion 54 and the second end portion 53, that is, across the coupling card slot 30.

The coupling card slot 30 is interference-fitted with the connecting portion 53 to fix both sides of the connecting portion 53. That is, the two card slot side walls 32 of the coupling card slot 30 clamp the connecting portion 53 of the card holder 50, so that the card holder 50 does not sway laterally.

A fixing groove 55 is formed between the first end portion 52 and the second end portion 53. The fixing groove 55 is in interference fit with the fixing portion 33 to fix both ends of the card holder 50. As shown in FIG. 3, the fixing portion 33 is held by the first end portion 52 and the second end portion 53 of the cartridge 50 in the intermediate fixing groove 55, so that the position of the cartridge 50 is fixed and does not occur in two. Shaking between the resonant cavities 20.

The surface of the coupling card slot 30 that contacts the card holder 50 and the surface of the partition wall 21 that contacts the card holder 50 are both planar. Specifically, the card slot bottom wall 31, the card slot side wall 32, and the partition wall 21 of the resonant cavity 20 surrounding the fixing portion 33 are all planar, as shown in FIG. The groove walls of the fixing grooves 55 of the cartridge 50 are also flat, as shown in FIG. The flat surface of the contact surface makes production and installation more convenient.

Both the fixing groove 55 and the coupling card slot 30 are square grooves, and the fixing portion 33 is a square fixing portion. Specifically, in the fixing groove 55, adjacent groove walls are perpendicular to each other. The card slot bottom wall 31 and the card slot side wall 32 of the coupling card slot 30 are perpendicular to each other, and the partition wall 21 of the card slot side wall 32 connected to the fixing portion 33 is also perpendicular to each other. Since the angle formed between the adjacent faces is a right angle, the mounting of the card holder 50 can be made more convenient.

Please refer to FIG. 7. FIG. 7 is a schematic diagram of simulation results of the filter of the present invention. It can be seen from Fig. 7 that the capacitive coupling broadband obtained when the coupling member of the annular structure is applied to the TM mode dielectric filter is -5.6046.

The present invention also provides a communication radio frequency device. As shown in FIG. 8, the communication radio frequency device in this embodiment is a combiner 60, which includes a filter 61, which is a filter of any of the above embodiments. 61. In particular, the communication radio frequency device 61 may also be a simplex, duplexer, splitter or tower amplifier, etc., which is not limited by those skilled in the art.

In summary, the ring current formed by the coupling member of the annular structure of the filter of the present invention conducts electric field energy, generates capacitive coupling, and can transmit strong electric field energy.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims (10)

1. A TM mode dielectric filter, comprising: a cavity, a cover plate and at least two dielectric resonators disposed in the cavity, the cover plate covering the cavity, the dielectric resonator Separated by a partition wall to form a respective resonant cavity, the partition wall between at least two adjacent resonant cavities is provided with a coupling card slot, and the coupling card slot is provided with a coupling member;

   The coupling member includes a first coupling portion, a second coupling portion, and an engaging portion, and the two ends of the engaging portion are respectively connected to the first coupling portion and the second coupling portion, and the connecting portion penetrates the coupling card a slot, the first coupling portion and the second coupling portion are respectively disposed in two adjacent resonant cavities, and the first coupling portion and the second coupling portion are both annular structures, a plane of the annular structure is parallel to an electric field direction of the dielectric resonator, and a gap is formed on the annular structure of the first coupling portion and the second coupling portion, the notch breaking the annular structure open.
2. The TM mode dielectric filter according to claim 1, wherein a plane in which the first coupling portion is located and a plane in which the second coupling portion are located are the same plane.
3. The TM mode dielectric filter according to claim 2, wherein the annular structure has a rectangular shape or an elliptical shape.
4. The TM mode dielectric filter according to claim 3, wherein the filter further comprises a card holder, and the card holder has an interference fit with the coupling card slot to fix the card holder in the holder Said on the coupling card slot;

   The top of the card holder is provided with a mounting groove that is in an interference fit with the engaging portion to fix both sides of the engaging portion to the card holder.
5. The TM mode dielectric filter according to claim 4, wherein a bottom portion of the joint between the engaging portion and the first coupling portion and the second coupling portion protrudes to form a engaging portion, The engaging portion is clamped on the card holder to fix the position of the first coupling portion and the second coupling portion in the resonant cavity.
6. The TM mode dielectric filter according to claim 5, wherein the coupling card slot comprises a card slot bottom wall and two mutually symmetric card slot sidewalls, the card slot sidewall and the card The partition wall connected to both sides of the side wall of the groove forms a fixing portion;

   The card holder has a cross-section in a "work" shape, including a first end portion, a second end portion, and a connecting portion connected between the first end portion and the second end portion;

   The first end portion and the first coupling portion are located in the same resonant cavity;

   The second end portion and the second coupling portion are located in the same resonant cavity;

   The mounting groove extends through the first end portion, the connecting portion and the second end portion;

   The coupling card slot is interference fit with the connecting portion to fix both sides of the connecting portion;

   A fixing groove is formed between the first end portion and the second end portion, and the fixing groove is interference-fitted with the fixing portion to fix both ends of the card seat.
7. The TM mode dielectric filter according to claim 6, wherein the length of the engaging portion coincides with the length of the mounting groove.
8. The TM mode dielectric filter according to claim 7, wherein a surface of the coupling card slot that contacts the card holder and a surface of the partition wall that contacts the card holder are both planar.
9. The TM mode dielectric filter according to claim 8, wherein the fixing groove and the coupling card slot are square grooves, and the fixing portion is a square fixing portion.
10. A communication radio frequency device comprising the TM mode dielectric filter according to any one of claims 1-9.