Dielectric resonator

Abstract

The present invention discloses a dielectric resonator, comprising: a cavity having an upper opening; a cover plate covering the upper opening; a debugging screw mounted on the cover plate; a metal resonant rod fixed to the bottom of the cavity; the dielectric resonant rod having an upper end face and a lower end face, the upper end face in contact with the cover plate, and the lower end face in contact with the metal resonant rod; the metal resonant rod having an outer arc surface and an inner arc surface, the metal resonant rod having at least two grooves extending from the outer arc surface to the inner arc surface, the grooves being evenly distributed and at least partially overlapping in the axial direction. By designing grooves in the metal resonant rod to form an elastic deformation region, good contact between the cover plate, the dielectric resonant rod, and the metal resonant rod is ensured. The elastic structure used in the dielectric resonator is reliable and simple and convenient to manufacture.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless network communications, and in particular to a dielectric resonator. Background Art

[0002] The resonator is one of the main components of a filter. To ensure good contact between the dielectric resonant rod, metal resonant rod, and cover plate within the resonator, existing technologies create a spring structure by adding a spring-loaded reed between the dielectric and metal resonant rods. Because the spring requires elasticity, the reed must be slotted or bent to form a deformation zone. Furthermore, factors such as assembly tolerances can lead to discontinuous contact between the dielectric and metal resonant rods. This critical contact area can lead to poor performance.

[0003] Therefore, it is necessary to provide a new dielectric resonator to solve the above problems. Summary of the Invention

[0004] The object of the present invention is to provide a dielectric resonator which can achieve good contact between two of the dielectric resonant rod, the metal resonant rod and the cover plate at a low cost and with a simple structure.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A dielectric resonator, comprising:

[0007] a cavity having an upper opening;

[0008] a cover plate, covering the upper opening;

[0009] A debugging screw is installed on the cover plate;

[0010] a metal resonant rod fixed to the bottom of the cavity;

[0011] a dielectric resonant rod having an upper end surface and a lower end surface, wherein the upper end surface contacts the cover plate, and the lower end surface contacts the metal resonant rod;

[0012] The metal resonance rod has an outer arc surface and an inner arc surface. The metal resonance rod has at least two grooves. The grooves extend from the outer arc surface to the inner arc surface, and the grooves are evenly distributed.

[0013] As a further improved technical solution of the present invention, the grooves at least partially overlap in the axial direction.

[0014] As a further improved technical solution of the present invention, the n-fold overlapping portion of the groove in the axial direction has at least two symmetry lines, where n is a natural number.

[0015] As a further improved technical solution of the present invention, the different overlapping parts of the grooves in the axial direction have at least one symmetry line overlapping.

[0016] As a further improved technical solution of the present invention, the grooves are parallel to each other or located on the same plane.

[0017] As a further improved technical solution of the present invention, the groove extends vertically axially from the outer arc surface to the inner arc surface.

[0018] As a further improved technical solution of the present invention, the cutting groove extends obliquely from the outer arc surface to the inner arc surface.

[0019] As a further improved technical solution of the present invention, the metal resonance rod includes a rod portion and a ring portion, the outer diameter of the ring portion is larger than the outer diameter of the rod portion, the lower end surface contacts the ring portion, and the groove is provided on the rod portion.

[0020] As a further improved technical solution of the present invention, the metal resonance rod is fixed to the bottom of the cavity, or the metal resonance rod is fixed to the bottom of the cavity by screws.

[0021] As a further improved technical solution of the present invention, in a natural state, the distance between the metal resonant rod and the cover plate is equal to or less than the axial height of the dielectric resonant rod.

[0022] Compared to the prior art, the dielectric resonator of the present invention has the following beneficial effects: by designing grooves in the metal resonant rod to form an elastic deformation area, when the dielectric resonant rod forms interference contact with the cover plates and the metal resonant rod at both ends, the cover plates will exert downward pressure on the dielectric resonant rod, and the pressure will be transmitted downward to the elastic deformation area of ​​the metal resonant rod, forming a certain elastic deformation and generating an upward elastic force, thereby ensuring good contact between the cover plates, the dielectric resonant rod, and the metal resonant rod, thereby achieving the product's electrical specifications at a low cost and with a simple structure. The elastic structure used in the dielectric resonator is simple and convenient to process, does not require the use of additional materials such as reeds, and has a simple and reliable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic cross-sectional view of a dielectric resonator according to a specific embodiment of the present invention;

[0024] Figure 2 A schematic cross-sectional view of a dielectric resonator according to a specific embodiment of the present invention;

[0025] Figure 3 Schematic diagram of the three-dimensional structure of a metal resonant rod according to a specific embodiment of the present invention;

[0026] Figure 4is a schematic diagram of a cutaway three-dimensional structure of a metal resonance rod according to a specific embodiment of the present invention;

[0027] Figure 5 A schematic cross-sectional view of a dielectric resonator according to a specific embodiment of the present invention;

[0028] Figure 6 A schematic cross-sectional view of a dielectric resonator according to a specific embodiment of the present invention;

[0029] Figure 7 Schematic diagram of the three-dimensional structure of a metal resonant rod according to a specific embodiment of the present invention;

[0030] Figure 8 is a schematic diagram of a cutaway three-dimensional structure of a metal resonance rod according to a specific embodiment of the present invention;

[0031] Figure 9 This is a schematic structural diagram of a metal resonant rod according to a specific embodiment of the present invention;

[0032] Figure 10 FIG. 1 is a schematic diagram of the three-dimensional structure of a dielectric resonator according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0033] The following exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. If there are several specific embodiments, the features of these embodiments can be combined with each other without conflict. When the description refers to the drawings, unless otherwise specified, the same numbers in different drawings represent the same or similar elements. The contents described in the following exemplary embodiments do not represent all embodiments consistent with the present invention; rather, they are merely examples of devices, products and / or methods consistent with some aspects of the present invention as described in the claims of the present invention.

[0034] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention. The singular forms "a", "an", "the" or "the" used in the specification and claims of the present invention are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0035] It should be understood that the words used in the specification and claims of the present invention, such as "first", "second" and similar words, do not indicate any order, quantity or importance, but are only used to distinguish the names of features. Similarly, "one" or "an" and similar words do not indicate a quantity limitation, but rather indicate the existence of at least one. Unless otherwise specified, the words "front", "back", "upper", "lower" and similar words that appear in the present invention are only for the convenience of description and are not limited to a specific position or a spatial orientation. Words such as "include" or "comprises" are open-ended expressions, meaning that the elements appearing before "include" or "comprises" include the elements appearing after "include" or "comprises" and their equivalents, which does not exclude that the elements appearing before "include" or "comprises" may also include other elements. If "several" appears in the present invention, it means two or more.

[0036] See also Figures 1 to 10 As shown, an embodiment of the present invention discloses a dielectric resonator, including a cavity 1, a cover plate 2, a debugging screw 3, a metal resonance rod 4 and a dielectric resonance rod 5, the cover plate 2 is fixed on the cavity 1, the metal resonance rod 4 is fixed to the bottom of the cavity 1, the dielectric resonance rod 5 is installed between the cover plate 2 and the metal resonance rod 4, and the debugging screw 3 is installed on the cover plate 2.

[0037] The cavity 1 has an upper opening 11 and only one opening. The cover 2 covers the upper opening 11. The cover 2 can be fixed to the cavity 1 by screws. The cover 2 has an opening 21. Furthermore, a boss 12 is provided at the bottom of the cavity 1 to facilitate the positioning and installation of the metal resonant rod 4. The metal resonant rod 4 is fixed to the boss 12 by screws. In other embodiments, the metal resonant rod 4 is fixed to the bottom of the cavity 1, such as by welding the metal resonant rod 4 to the boss 12, or by providing the boss 12 with a positioning protrusion 121, and the metal resonant rod 4 is fixed by being clamped to the positioning protrusion 121. Of course, the metal resonant rod 4 and the bottom of the cavity 1 can also be fixed by other matching structures. The metal resonant rod 4 includes a rod portion 42 and a ring portion 43. The outer diameter of the ring portion 43 is larger than the outer diameter of the rod portion 42. The dielectric resonant rod 5 has an upper end face 51 and a lower end face 52. The upper end face 51 contacts the cover plate 2, and the lower end face 52 contacts the metal resonant rod 4; specifically, the lower end face 52 contacts the ring portion 43. Both the metal resonant rod 4 and the dielectric resonant rod 5 are hollow structures. The metal resonant rod 4 has a first channel 44, and the dielectric resonant rod 5 has a second channel 53. The first channel 44, the second channel 53 and the opening 21 are axially corresponding and connected. The debugging screw 3 and the nut 6 are installed in the cover plate 2 in cooperation, so that the cavity 1 has good airtightness. The debugging screw 3 passes through the opening 21 of the cover plate 2 and extends into the second channel 53, thereby making the radio frequency parameters of the dielectric resonator adjustable. Furthermore, the debugging screw 3 is at least partially located outside the cavity 1, and the nut 6 is tightly attached to the cover plate 2 outside the cavity 1. The debugging screw 3 is at least partially located on the outside of the nut 6.

[0038] In some embodiments, the opening 21 of the cover plate 2 is provided with an internal thread that matches the external thread of the debugging screw 3 to increase the contact area between the cover plate 2 and the debugging screw 3 to ensure good contact between the two.

[0039] Furthermore, the outer diameter and inner diameter of the dielectric resonance rod 5 are respectively equivalent to the outer diameter and inner diameter of the ring portion 43, and the cover plate 2 covers the entire upper opening 11 of the cavity 1, so that the upper end surface 51 and the lower end surface 52 of the dielectric resonance rod 5 can be fully in contact with the cover plate 2 and the ring portion 43, respectively.

[0040] The cover plate 2 is fixedly connected to the cavity 1 and can be fixed by screws. When the dielectric resonance rod 5 needs to be replaced, the cover plate 2 can be directly opened to take out the dielectric resonance rod 5 for replacement.

[0041] In this embodiment, cavity 1 is a metal cavity, and dielectric resonant rod 5 is a ceramic dielectric resonant rod, whose upper end surface 51 and lower end surface 52 may be covered with a conductive material. In some embodiments, the conductive material may be a conductive metal such as gold, silver, or copper; in other embodiments, the conductive material may be a conductive non-metal.

[0042] The metal resonant rod 4 has an outer curved surface 40a and an inner curved surface 40b. Furthermore, the outer curved surface 40a is located on the rod portion 42, and the inner curved surface 40b extends from the rod portion 42 to the ring portion 43. The metal resonant rod 4 has at least two slots 41 extending from the outer curved surface 40a to the inner curved surface 40b. The slots 41 are evenly distributed on the metal resonant rod 4 and at least partially overlap in the axial direction. Furthermore, the slots 41 are provided on the rod portion 42, with the plurality of slots 41 being parallel to each other or located on the same plane. In some embodiments, the slots 41 extend perpendicularly from the outer curved surface 40a to the inner curved surface 40b; in other embodiments, the slots 41 extend obliquely from the outer curved surface 40a to the inner curved surface 40b.

[0043] The n-fold overlapping portions of the slots 41 in the axial direction have at least two lines of symmetry, where n is a natural number. Specifically, when all the slots 41 are projected in the axial direction, the non-overlapping portion (i.e., when n is 0) has at least two lines of symmetry, the single-fold overlapping portion (i.e., when n is 1) has at least two lines of symmetry, the double-fold overlapping portion (i.e., when n is 2) has at least two lines of symmetry, and so on. Of course, the n-fold overlapping portion having at least two lines of symmetry is premised on the existence of n-fold overlap. Furthermore, the slots 41 with different fold overlapping portions in the axial direction have at least one overlapping line of symmetry. For example, if the slots 41 have no overlap, single overlap, and double overlap in the axial direction, then the non-overlapping portion, the single overlap portion, and the double overlap portion have at least one overlapping line of symmetry, i.e., they share at least one common line of symmetry.

[0044] Furthermore, in a natural state, i.e., when the cover plate 2, the metal resonant rod 4, and the dielectric resonant rod 5 are not deformed, the distance between the metal resonant rod 4 and the cover plate 2 is equal to or less than the axial height of the dielectric resonant rod 5. This allows the dielectric resonant rod 5 to be tightly fixed between the cover plate 2 and the top of the metal resonant rod 4, ensuring full contact between the three.

[0045] In this embodiment, the metal resonant rod 4 is made of metal, and the thickness of the rod portion 42, namely, the distance between the outer curved surface 40a and the inner curved surface 40b, is reasonably designed. Therefore, the slot 41 provided therein provides elasticity, and the slot 41 is simple and convenient to manufacture. When the dielectric resonant rod 5 forms interference contact between the cover plate 2 and the metal resonant rod 4, the cover plate 2 exerts downward pressure on the dielectric resonant rod 5, which is then transmitted downward to the metal resonant rod 4. The metal resonant rod 4 undergoes a certain elastic deformation, generating an upward elastic force. This ensures that the contact between the cover plate 2, the dielectric resonant rod 5, and the metal resonant rod 4 is always continuous and stable.

[0046] See also Figures 1 to 4As shown, in one embodiment of the present invention, the metal resonant rod 4 has two slots 41 of identical shape and size, arranged parallel and perpendicular to the axial direction. Viewed axially, the slots 41 are arc-shaped, larger than a semicircle, and are cut inward from radially opposite sides of the rod portion 42. The slots 41 axially have a non-overlapping portion and a primary overlapping portion. The non-overlapping portion has two lines of symmetry, and the primary overlapping portion has two lines of symmetry, both of which coincide. The metal resonant rod 4 is fixed to the boss 12 at the bottom of the cavity 1 by screws.

[0047] See also Figures 5 to 8 As shown, in another embodiment of the present invention, the metal resonant rod 4 has six slots 41 of identical shape and size. These slots 41 are arranged perpendicular to the axial direction and arranged in three parallel rows. Specifically, two slots 41 are provided on the same plane, with each slot 41 facing each other. The slots 41 are arc-shaped, less than a semicircle. The slots 41 in the upper and lower rows extend inward from opposite radial sides of the rod portion 42, while the slots 41 in the middle row extend inward from opposite radial sides of the rod portion 42 perpendicular to the cutting direction of the upper and lower rows. The slots 41 axially comprise a non-overlapping portion, a primary overlapping portion, and a secondary overlapping portion. The non-overlapping portion has two lines of symmetry, the primary overlapping portion has two lines of symmetry, and the secondary overlapping portion has four lines of symmetry, with two of the three lines of symmetry overlapping. The boss 12 of the cavity 1 is provided with a positioning protrusion 121, which mates with the first channel 44. The metal resonant rod 4 engages with the positioning protrusion 121 and can be further reinforced by welding.

[0048] In some embodiments, the metal resonance rod 4 may also form an integrated structure with the cavity 1 .

[0049] See also Figure 9 As shown, in other embodiments of the present invention, the metal resonant rod 4 has two slots 41 of identical shape and size, which are parallel and obliquely arranged. Viewed axially, the slots 41 are arc-shaped, larger than a semicircle, and are cut inward from radially opposite sides of the rod portion 42. The slots 41 axially have a non-overlapping portion and a primary overlapping portion. The non-overlapping portion has two lines of symmetry, and the primary overlapping portion has two lines of symmetry, with both lines of symmetry coinciding.

[0050] See also Figures 1 to 10 As shown, the dielectric resonator of this embodiment is in a closed state, with only the nut 6 and a portion of the debugging screw 3 exposed to the outside, thereby facilitating the adjustment of the radio frequency parameters of the dielectric resonator.

[0051] The dielectric resonator of this embodiment can be applied to radio frequency communication devices or signal processing devices such as filters, duplexers, combiners, transmitters, and tower-mounted amplifiers.

[0052] In summary, compared with the prior art, the dielectric resonator of the present invention has the following advantages: by designing a slot 41 in the metal resonant rod 4 to form an elastic deformation area, when the dielectric resonant rod 5 forms an interference contact with the cover plate 2 and the metal resonant rod 4 at both ends, the cover plate 2 will exert downward pressure on the dielectric resonant rod 5, and the pressure will be transmitted downward to the elastic deformation area of ​​the metal resonant rod 4, forming a certain elastic deformation, and at the same time generating an upward elastic force, thereby ensuring good contact between the cover plate 2, the dielectric resonant rod 5 and the metal resonant rod 4, achieving the electrical indicators of the product at a low cost and a simple structure. The elastic structure used in the dielectric resonator is simple and convenient to process, does not require the use of additional materials such as reeds, and has a simple and reliable structure.

[0053] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of this specification should be based on technical personnel in the relevant technical field. Although this specification has described the present invention in detail with reference to the above embodiments, ordinary technical personnel in the field should understand that technical personnel in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be covered by the scope of the claims of the present invention.

Claims

1. A dielectric resonator, comprising: A cavity (1) having an upper opening (11); a cover plate (2) covering the upper opening (11); A debugging screw (3) is mounted on the cover plate (2); A metal resonant rod (4) fixed to the bottom of the cavity (1); A dielectric resonant rod (5) having an upper end surface (51) and a lower end surface (52), wherein the upper end surface (51) contacts the cover plate (2), and the lower end surface (52) contacts the metal resonant rod (4); Its characteristics are: The metal resonant rod (4) has an outer arc surface (40a) and an inner arc surface (40b), and the metal resonant rod (4) has at least two grooves (41), the grooves (41) extend from the outer arc surface (40a) to the inner arc surface (40b), and the grooves (41) are evenly distributed; The slots (41) at least partially overlap in the axial direction; The n-fold overlapping portion of the projection of the cutting groove (41) in the axial direction has at least two symmetry lines, where n is a natural number.

2. The dielectric resonator according to claim 1, wherein: Different overlapping portions of the slots (41) in the axial direction have at least one symmetry line overlapping.

3. The dielectric resonator according to claim 1, wherein: The cutting grooves (41) are parallel to each other or located on the same plane.

4. The dielectric resonator according to claim 1, wherein: The cutting groove (41) extends vertically and axially from the outer arc surface (40a) to the inner arc surface (40b).

5. The dielectric resonator according to claim 1, wherein: The cutting groove (41) extends obliquely from the outer arc surface (40a) to the inner arc surface (40b).

6. The dielectric resonator according to claim 1, wherein: The metal resonance rod (4) comprises a rod portion (42) and a ring portion (43), the outer diameter of the ring portion (43) is larger than the outer diameter of the rod portion (42), the lower end surface (52) contacts the ring portion (43), and the groove (41) is provided on the rod portion (42).

7. The dielectric resonator according to claim 1, wherein: The metal resonance rod (4) is fixed to the bottom of the cavity (1), or the metal resonance rod (4) is fixed to the bottom of the cavity (1) by screws.

8. The dielectric resonator according to claim 1, wherein: In a natural state, the distance between the metal resonance rod (4) and the cover plate (2) is equal to or less than the axial height of the dielectric resonance rod (5).

Images