A metal resonator

Abstract

The present application relates to a kind of metal resonators, including the cavity with open end, the resonant column of installation to the bottom of cavity, the cover plate of installation to the open end of cavity, tunable screw rod movably installed to cover plate;The center of resonant column is provided with first inner hole, tunable screw rod can extend to or into the first inner hole;It further includes the resonant disc at the end of resonant column to the cover plate, the surface of resonant disc towards the end cover is provided with inner recess area, cover plate is provided with protruding piece, at least a portion of protruding piece enters the inner recess area and does not directly contact with the inner wall of the inner recess area.The resonant disc of the present application is provided with the inner recess area adapted to the protruding piece of cover plate, the distance between capacitor plate is reduced by inner recess area, and the capacitance is increased, so that the resonant frequency is greatly reduced.And it is not necessary to reduce the resonant frequency by the way of increasing the area of resonant disc to increase the capacitance, so as to realize the miniaturization of product.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of radio frequency communication technology, in particular to a metal resonator. BACKGROUND

[0002] The filter is the center of the design in radio technology, which has the function of frequency selection, can suppress the frequency signal that is not needed, and select the frequency signal that is submerged. At present, as the signals in the microwave frequency band are more and more dense, the requirement for signal selection is also higher and higher. With the popularization and maturation of 5G technology, the requirement for the performance and miniaturization of microwave devices, especially the low-frequency band filter, is also higher and higher. The resonator is the main component of the filter.

[0003] For the selection of resonators and filters in the low-frequency band, the dielectric waveguide resonator and filter cannot meet the current requirements of 5G technology for low-frequency band filters due to their own performance and processing technology, etc. For example, the ceramic dielectric resonator and filter cause the ceramic dielectric to crack due to rapid heat dissipation, or the overall volume of the resonator and filter processed cannot meet the current requirement for miniaturization of 5G technology. Therefore, a solution is urgently needed. SUMMARY

[0004] To solve the above technical problems, the purpose of the present application is to provide a miniaturized and high-performance metal resonator.

[0005] The present application provides a metal resonator, comprising a cavity with an open end, a resonant column mounted to the bottom of the cavity, a cover plate mounted to the open end of the cavity, and a tuning screw movably mounted to the cover plate; the center of the resonant column is provided with a first inner hole, and the tuning screw can extend to or enter the first inner hole; characterized in that it further comprises a resonant disc located at the end of the resonant column close to the cover plate, the surface of the resonant disc facing the cover plate is provided with an inner recess area, and the cover plate is provided with a protruding part, at least a part of the protruding part enters the inner recess area and does not directly contact the inner wall of the inner recess area.

[0006] Preferably, the center of the resonant disc is provided with a second inner hole, and the first inner hole and the second inner hole form a central through hole with the same inner diameter.

[0007] Preferably, the inner recess area includes an annular groove or an arc-shaped groove formed on the resonant disc.

[0008] Preferably, the inner recess area includes an annular through hole or an arc-shaped through hole formed on the resonant disc and penetrating the resonant disc along the length direction of the tuning screw.

[0009] Preferably, the inner recessed region comprises an arc-shaped groove and an arc-shaped through hole penetrating the resonant disc along the length direction of the tuning screw, and the arc-shaped groove and the arc-shaped through hole are jointly connected into a ring-shaped inner recessed region.

[0010] Preferably, the inner recessed region comprises a strip-shaped groove on the resonant disc.

[0011] Preferably, the resonant disc is circular or square.

[0012] Preferably, the inner recessed region is distributed around the second inner hole or on both sides of the second inner hole.

[0013] Further, the inner recessed region is further filled with a dielectric material, and the dielectric constant of the dielectric material is different from the dielectric constant of the inner wall of the resonant disc.

[0014] Preferably, the dielectric material is pre-provided with a position for accommodating the protruding piece for the protruding piece to extend into.

[0015] Preferably, the number of the protruding pieces is the same as the number of the grooves, and the shape of the protruding pieces is adapted to the shape of the grooves.

[0016] The resonant disc of the present application is provided with an inner recessed region adapted to the protruding piece of the cover plate, the distance between the capacitive plates is reduced through the inner recessed region, the capacitance is increased, and the resonant frequency is greatly reduced. And it is not necessary to reduce the resonant frequency by increasing the area of the resonant disc to increase the capacitance, so as to realize the miniaturization of the product. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a longitudinal sectional view of the metal resonator provided by an embodiment of the present application;

[0018] Figure 2 It is Figure 1 a perspective view of the cover plate and the protruding piece of the metal resonator shown in the figure;

[0019] Figure 3 It is Figure 1 a perspective view of the resonant column, the resonant disc and the ring-shaped inner recessed region of the metal resonator shown in the figure;

[0020] Figure 4 It is Figure 3 a longitudinal sectional view of the resonant column, the resonant disc and the inner recessed region filled with the dielectric material of the metal resonator shown in the figure;

[0021] Figure 5 It is a longitudinal sectional view of the resonant column, the resonant disc and the inner recessed region of the metal resonator provided by another embodiment of the present application, and the inner recessed region comprises a plurality of grooves;

[0022] Figure 6 It is Figure 5A perspective view of the illustrated assembly. DETAILED DESCRIPTION

[0023] The application will be further described below with reference to the accompanying drawings and examples.

[0024] With reference to Figure 1 The metal resonator 100 provided by the application comprises a cavity 10 with an open end, a resonant column 20 mounted to the bottom of the cavity 10, a cover plate 30 mounted to the open end of the cavity 10, a tuning screw 40 mounted to the cover plate 30 and movable relative to the cover plate 30, and a resonant disc 50 arranged at the end of the resonant column 20 close to the cover plate 30.

[0025] The resonant column 20 is provided with a first inner hole 21 at the center thereof, so that the resonant column 20 is fixed to the bottom of the cavity 10 by a connecting member such as a screw through the first inner hole 21. The tuning screw 40 can extend into or enter the first inner hole 21, and the tuning screw 40 is movable relative to the cover plate 30 and also movable relative to the resonant column 20 and adjustable in depth of extension into the first inner hole 21, so as to perform frequency tuning.

[0026] The resonant disc 50 is provided with a second inner hole 51 at the center thereof, and the second inner hole 51 and the first inner hole 21 form a center through hole with the same inner diameter. In the embodiment, after the resonant disc 50 is arranged, the resonant frequency of the metal resonator 100 is tuned by the depth of extension of the tuning screw 40 into or into the center through hole.

[0027] With reference to Figure 1 , Figure 2 and Figure 3 Further, the surface of the resonant disc 50 facing the cover plate 30 is provided with an inner recessed area 55. The cover plate 30 is provided with a protruding member 31, at least a part of the protruding member 31 enters or extends into the inner recessed area 55, and the protruding member 31 does not directly contact the inner wall of the inner recessed area 55. According to the formula of capacitance: C = (ε * S) / (4 π * k * d), S is the facing area of the electric plate, and d is the distance between the electric plate. In this way, the product extends into the inner recessed area 55 through the protruding member 31, which reduces the distance between the capacitance plates, increases the capacitance, and greatly reduces the resonant frequency. And it is not necessary to increase the area of the resonant disc to increase the capacitance to reduce the resonant frequency, so as to realize the miniaturization of the product. Specifically, the deeper the depth of extension of the protruding member 31 into the inner recessed area 55, the greater the capacitance and the lower the resonant frequency.

[0028] It can be understood that the cavity 10, the resonant column 20, the cover plate 30, the tuning screw 40 and the resonant disc 50 are all made of metal material. The outer surface and the inner wall of the cavity 10, the outer wall of the resonant column 20, the inner wall of the first inner hole 21, the outer surface of the cover plate 30 and the convex piece 31, the outer surface of the tuning screw 40, the inner wall of the resonant disc 50 and the inner recessed area 55 are all coated with a metal layer; that is, the overall outer surface of the metal resonator 100 is coated with a metal layer to ensure and improve the grounding performance of the product as a whole, and also to stabilize and improve the Q value.

[0029] In the embodiment, the inner recessed area 55 includes an annular groove formed on the resonant disc 50. The annular groove can be a blind groove or a through groove, and can be partially a through hole or a through groove and partially a blind groove. Preferably, the inner recessed depth of the blind groove is not more than three quarters of the total thickness from the upper surface of the resonant disc 50 to the bottom end thereof. Referring to Figure 3 In the embodiment, the inner recessed area 55 is an annular groove, which includes an arc-shaped groove 56 and an arc-shaped through hole 57 formed on the resonant disc 55 and penetrating the resonant disc 50 along the length direction of the tuning screw 40, and the arc-shaped groove 56 and the arc-shaped through hole 57 are jointly connected into the annular inner recessed area 55. In the present claim and the specification, the annular groove refers to a groove closed into a complete ring, the arc-shaped groove refers to a groove not closed into a complete ring, and the arc-shaped through hole refers to a through hole not closed into a complete ring. Preferably, the shape of the convex piece 31 is adapted to the shape of the corresponding groove; and the convex piece 31 is arranged at the middle position of each corresponding groove.

[0030] Referring to Figure 4 Further, the inner recessed area 55 is further filled with a dielectric material 80. The dielectric constant of the dielectric material 80 is different from that of the inner wall of the resonant disc 50 and the inner recessed area 55. By filling the inner recessed area 55 with a dielectric material 80 with a special high or low dielectric constant, the resonant frequency of the metal resonator 100 is tuned. Specifically, the filled dielectric material 80 is pre-provided with a position for accommodating the convex piece 31; so that the convex piece 31 can extend into the inner recessed area 55 filled with the dielectric material 80. For example, the inner recessed area 55 is filled with a dielectric material such as polytetrafluoroethylene and ceramic material, so that the resonant frequency is greatly reduced to not more than 100 MHz frequency band. According to the capacitance formula: C = (ε * S) / (4 π * k * d), ε is the dielectric constant of the dielectric between the capacitor plates; by filling the dielectric material with a high dielectric constant, the capacitance can be further increased. The convex piece 31 can be in contact with the dielectric material 80.

[0031] Preferably, the resonant disc 50 is circular, the inner recessed area 55 is an annular groove, and the annular groove is distributed around the second inner hole 51. The combination of the circular resonant disc 50 and the annular groove can have more effective capacitance area, so as to facilitate the tuning of the resonant frequency (refer to Figure 3). On the other hand, the annular groove is a closed ring, which is more beneficial to preserve and fix the filled medium material. Understandably, the resonant plate 50 can also be square, etc. (see Figure 6 ).

[0032] Referring to Figure 5 and Figure 6 In other embodiments, the inner recessed area 55 can also include strip-shaped grooves. The strip-shaped grooves 555 form the inner recessed area 55 distributed on both sides of the second inner hole 51.

[0033] In another specific embodiment, the inner recessed area 55 includes a plurality of grooves. For example, a plurality of annular grooves, a plurality of arc-shaped grooves, or a plurality of strip-shaped grooves. The design of the plurality of grooves further increases the capacitance; and the resonant frequency of the metal resonator 100 decreases with the increase of the number of grooves in the inner recessed area 55 of the resonant plate 50.

[0034] Preferably, the number of protrusions 31 is the same as the number of grooves.

[0035] Further, the above several metal resonators 100 can be coupled to form a low-frequency filter through the coupling window. By setting the cooperation between the inner recessed area 55 of the metal resonator 100 and the protrusions 31 of the cover plate 30, the low-frequency filter can greatly reduce the resonant frequency without changing the overall volume of the product. Further, by filling the inner recessed area 55 with polytetrafluoroethylene, ceramic material, and other medium materials, the resonant frequency can be greatly reduced to not more than the 100MHz frequency band.

[0036] The above embodiments only express the preferred embodiments of the present application, which are described in detail and specifically, but should not be understood as limiting the scope of the patent of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, such as combining different features in each embodiment, etc., which are all within the protection scope of the present application.

Claims

1. A metal resonator, comprising a cavity having an open end, a resonant post mounted to the bottom of the cavity, a cover plate mounted to the open end of the cavity, and a tuning screw movably mounted to the cover plate; wherein the resonant post has a first inner hole at its center, and the tuning screw is extendable into or enters the first inner hole; characterized in that, It also includes a resonant disk located near the end of the cover plate of the resonant column. The surface of the resonant disk facing the cover plate has a concave region. The cover plate has a protrusion. At least a portion of the protrusion enters the concave region but does not directly contact the inner wall of the concave region. One part of the concave region is a through hole or through groove, and the other part is a blind groove. The concavity of the blind groove does not exceed three-quarters of the total thickness from the upper surface of the resonant disk to its bottom end. The blind groove region of the concave region is also filled with a dielectric material. The dielectric constant of the dielectric material is different from that of the inner wall of the resonant disk. The dielectric material has a pre-set position to accommodate the protrusion for the protrusion to extend into, and the protrusion contacts the dielectric material. A second inner hole is provided at the center of the resonant disk. The first inner hole and the second inner hole are connected to form a central through hole with the same inner diameter.

2. The metal resonator as described in claim 1, characterized in that, The cavity, resonant pillar, cover plate, tuning screw, and resonant disk are all made of metal; the entire outer surface of the metal resonator is coated with a metal layer.

3. The metal resonator as described in claim 1, characterized in that, The concave region includes an annular groove or an arc-shaped groove formed on the resonant disk.

4. The metal resonator as described in claim 1, characterized in that, The concave region includes an annular or arc-shaped through-hole formed on the resonant disk along the length of the tuning screw, penetrating the resonant disk.

5. The metal resonator as described in claim 1, characterized in that, The concave region includes an arc-shaped groove and an arc-shaped through hole that penetrates the resonant disk along the length of the tuning screw. The arc-shaped groove and the arc-shaped through hole are connected together to form an annular concave region.

6. The metal resonator as claimed in claim 1, characterized in that, The concave region includes a strip-shaped groove on the resonant disk.

7. The metal resonator as claimed in claim 1, characterized in that, The resonant disk is circular or square.

8. The metal resonator as claimed in claim 1, characterized in that, The concave region is distributed around the second inner hole or on both sides of the second inner hole.

9. The metal resonator as claimed in claim 1, characterized in that, The medium material includes polytetrafluoroethylene or ceramic materials.

10. The metal resonator as described in claim 3 or 6, characterized in that, The number of protrusions is the same as the number of grooves; the shape of the protrusions is adapted to the shape of the grooves.

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