Downclocking resonator and filter

Abstract

The invention discloses a frequency reduction resonator and a filter, and relates to the technical field of resonators, the frequency reduction resonator comprises a resonator and a tuning disc which are matched with each other, the top of the resonator is provided with a resonance disc, a resonance inner cavity is formed in the resonance disc, and a resonance inner ring is arranged in the resonance inner cavity; a tuning inner cavity is formed in the bottom of the tuning disc, and a tuning inner ring is arranged in the tuning inner cavity; the peripheral side wall of the tuning inner cavity and the tuning inner ring are used for being inserted into the inner side and the outer side of the tuning inner ring respectively. The purposes of capacitance increasing and frequency reducing are achieved by adjusting the distance between the sawtooth grooves formed between the resonators and the tuning disc, so that frequency control can be achieved based on adjustment control of the height of the resonance disc, and the effects of facilitating production and remarkably increasing the frequency tuning amount are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of resonators, and in particular to a frequency reduction resonator and filter. Background Art

[0002] A filter is a filter circuit composed of capacitors, inductors and resistors. The filter can effectively filter out a specific frequency point in the power line or frequencies other than the frequency point to obtain a power signal with a specific frequency, or eliminate a power signal with a specific frequency.

[0003] The Chinese patent with announcement number CN202839916U discloses a coaxial cavity filter, which includes a cavity, a cover plate covering the cavity, and a resonator arranged in the cavity, the resonator includes a capacitor and a rod, the capacitor is arranged at one end of the rod, and the coaxial cavity filter also includes a tuning screw, one end of the tuning screw sequentially penetrates the cover plate and the capacitor and is inserted into the cavity, and the other end is fixed to the cover plate. The present invention is a coaxial cavity filter.

[0004] However, the resonator of the coaxial cavity filter increases the capacitance of the entire resonant cavity during the cooperation with the tuning screw, thereby reducing the passband frequency of the resonant cavity. However, the installation of the tuning screw will also cause changes in its overall structure, resulting in problems with the center of gravity adjustment and affecting the filtering effect of the filter. The production difficulty is high and needs to be improved. Summary of the invention

[0005] In view of this, the first object of the present application is to provide a frequency reduction resonator to achieve the purpose of low production difficulty and significantly increase the frequency tuning amount. The specific scheme is as follows: A frequency reduction resonator comprises a resonator and a tuning disk that match each other, wherein a resonance disk is arranged on the top of the resonator, a resonance cavity is formed in the resonance disk, and a resonance inner ring is arranged in the resonance cavity; a tuning cavity is arranged on the bottom of the tuning disk, and a tuning inner ring is arranged in the tuning cavity; wherein the outer peripheral side wall of the tuning cavity and the tuning inner ring are respectively used to insert the inner and outer sides of the tuning inner ring.

[0006] Preferably, the outer peripheral side wall of the tuning cavity and the depth of the tuning inner ring inserted into the resonant cavity are adjustable.

[0007] Preferably, the resonator is provided with a column located at the bottom of the resonance disk, and the column coincides with the axis of the resonance disk.

[0008] A second object of the present invention is to provide a filter, comprising the frequency reduction resonator as described above.

[0009] Preferably: it comprises a cavity, the bottom of the cavity is provided with mounting posts along the axis, the mounting posts are used to be connected and fixed with the columns; the top of the cavity is provided with an upper cover, the top of the tuning disk is connected and fixed with the upper cover.

[0010] It can be seen from the above scheme that the present application provides a frequency reduction resonator and a filter, which have the following beneficial effects: 1. The capacitance can be adjusted by adjusting the size of the resonator and the resonant disk, thereby increasing the capacitance while reducing the frequency; 2. The purpose of increasing capacitance and reducing frequency is achieved by adjusting the spacing of the sawtooth grooves formed between the resonator and the tuning disk, so that the frequency can be controlled based on the adjustment control of the height of the resonant disk, which is convenient for production and significantly increases the frequency tuning amount; 3. After testing, the frequency reduction of the cavity of the same size reached 21.7%, and when the tuning disk was 0.5mm deep, the frequency tuning amount reached 37MHz, which is much higher than the frequency tuning amount of 6MHz when the conventional screw was 1mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0012] Figure 1 A schematic cross-sectional view of the filter disclosed in this application; Figure 2 This is a graph showing the screw tuning amount detection results for the conventional solution; Figure 3 This is a graph showing the screw tuning amount detection results of the filter disclosed in this application.

[0013] Explanation of the reference numerals: 1. cavity; 2. mounting column; 3. resonator; 31. resonant disk; 32. resonant inner cavity; 33. resonant inner ring; 34. column; 4. tuning disk; 41. tuning inner cavity; 42. tuning inner ring. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0015] like Figure 1 As shown, a frequency reduction resonator includes a resonator 3 and a tuning disk 4 that match each other. Since the low frequency band of the existing resonator 3 cannot be changed based on the same single cavity size limitation, the resonant frequency cannot meet the required indicators. Therefore, a resonant disk 31 is provided at the top of the resonator 3 in the frequency reduction resonator 3 of the present application. Among them, a resonant inner cavity 32 is formed in the resonant disk 31, and a resonant inner ring 33 is provided in the resonant inner cavity 32. Correspondingly, a tuning inner cavity 41 is provided at the bottom of the tuning disk 4, and a tuning inner ring 42 is provided in the tuning inner cavity 41. The outer peripheral side wall of the tuning inner cavity 41 and the tuning inner ring 42 are respectively used to insert the inner and outer sides of the tuning inner ring 42, thereby forming a sawtooth groove structure that is bent and connected up and down. When the height, width and length of the sawtooth groove are adjusted, the purpose of increasing capacitance and reducing frequency can be achieved, that is, by changing the appearance of the resonator 3 and the tuning disk 4, the capacitance is increased and the frequency is reduced.

[0016] It can be seen that the outer peripheral side wall of the tuning cavity 41 and the depth of the tuning inner ring 42 inserted into the resonance cavity 32 in the embodiment of the present application are adjustable. At the same time, a column 34 located at the bottom of the resonance disk 31 is provided on the resonator 3, and the column 34 coincides with the axis of the resonance disk 31.

[0017] A filter comprises the frequency reduction resonator as described above.

[0018] The filter comprises a cavity 1. A mounting post 2 is arranged along the axis on the bottom of the cavity 1. The mounting post 2 is used to be connected and fixed with a column 34. At the same time, an upper cover is arranged on the top of the cavity 1, and the top of the tuning disk 4 is connected and fixed with the upper cover.

[0019] test: 1. Use the same size test; 2. Implementation of frequency tuning amount detection.

[0020] Based on the same size cavity, the frequency in the embodiment of the present application is 532MHz, and the frequency in the embodiment of the present application is 680MHz using the conventional coaxial cavity filter in the announcement number CN202839916U. It can be seen that the frequency reduction based on the same size cavity is 21.7%.

[0021] By adjusting the depth of the tuning disk in the embodiment of the present application, when the depth of the tuning disk is 0.5 mm, the frequency tuning amount reaches 37 MHz. When the conventional coaxial cavity filter in the announcement number CN202839916U is used for testing, the frequency tuning amount of the screw rod 1 mm is detected to be 6 MHz, which shows that the filter in the embodiment of the present application has the effect of significantly increasing the frequency tuning amount.

[0022] In summary, the present application provides a frequency reduction resonator and filter, which can adjust the capacitance by adjusting the size of the resonator 3 and the resonant disk 31, and thereby achieve the effect of reducing the frequency while increasing the capacitance. At the same time, the purpose of increasing the capacitance and reducing the frequency is achieved by adjusting the spacing of the sawtooth grooves formed between the resonator 3 and the tuning disk 4, so that the frequency can be controlled based on the adjustment control of the height of the resonant disk 31, which is easy to produce and significantly increases the frequency tuning amount.

[0023] The "first", "second", "third", "fourth", etc. (if any) referred to in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, or devices.

[0024] It should be noted that the descriptions involving "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0025] Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A frequency reduction resonator, comprising a resonator (3) and a tuning disk (4) that match each other, characterized in that: A resonant disk (31) is arranged at the top of the resonator (3), a resonant inner cavity (32) is formed in the resonant disk (31), and a resonant inner ring (33) is arranged in the resonant inner cavity (32); a tuning inner cavity (41) is arranged at the bottom of the tuning disk (4), and a tuning inner ring (42) is arranged in the tuning inner cavity (41); wherein the outer peripheral side wall of the tuning inner cavity (41) and the tuning inner ring (42) are respectively used to insert the inner and outer sides of the tuning inner ring (42).

2. A frequency reduction resonator according to claim 1, characterized in that: The outer peripheral side wall of the tuning inner cavity (41) and the depth of the tuning inner ring (42) inserted into the resonant inner cavity (32) are adjustable.

3. The frequency reduction resonator according to claim 1, characterized in that: The resonator (3) is provided with a column (34) located at the bottom of the resonance disk (31), and the axis of the column (34) coincides with the axis of the resonance disk (31).

4. A filter, characterized in that: It comprises adopting the frequency reduction resonator as described in any one of claims 1-3.

5. A filter according to claim 4, characterized in that: The invention comprises a cavity (1), wherein a mounting column (2) is arranged at the bottom of the cavity (1) along the axis, and the mounting column (2) is used to be connected and fixed with a column (34); an upper cover is arranged at the top of the cavity (1), and the top of the tuning disk (4) is connected and fixed with the upper cover.

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