CN212676438U

CN212676438U - Filter

Info

Publication number: CN212676438U
Application number: CN202021309518.0U
Authority: CN
Inventors: 何小波; 杨秀林; 柯友文; 鄢维光; 张俊
Original assignee: Wuhan Fingu Electronic Technology Co Ltd
Current assignee: Wuhan Fingu Electronic Technology Co Ltd
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2021-03-09
Anticipated expiration: 2030-07-07

Abstract

The utility model discloses a filter. It includes cavity and apron, be equipped with at least one first resonant cavity and at least one second resonant cavity in the cavity, be equipped with coupling device between first resonant cavity and the adjacent second resonant cavity, coupling device includes coupling window, flies pole piece and tuning screw, the coupling window sets up in separating the muscle upper end, it is planar platelike metallic structure to fly the pole piece, it passes to fly the pole piece level coupling window, fly the one end of pole piece and the resonance bar lateral wall fixed connection in the first resonant cavity, the other end that flies the pole piece and the resonance bar lateral wall interval arrangement in the second resonant cavity, tuning screw passes the apron is located the coupling window. The utility model relates to a flying bar piece one end and resonance bar fixed connection, the another side forms capacitive coupling with resonance bar interval arrangement, and magnetic field is stronger, and cross capacitive coupling intensity realizes more easily.

Description

Filter

Technical Field

The utility model belongs to the technical field of communication, concretely relates to wave filter.

Background

The cross capacitive coupling scheme in the traditional filter is that a flying rod metal bar is designed between two resonators and fixed in a tetrafluoroethylene support column, and two ends of the flying rod metal bar are arranged at intervals with the resonant rods, so that capacitive coupling is realized. The traditional cross capacitive coupling scheme is not practical, the frequency band is wide, the near end of the traditional cross capacitive coupling scheme is provided with a filter with out-of-band rejection requirements, the cross capacitive coupling after the product design is close to the resonant disk, the resonance frequency and the secondary resonance peak are greatly influenced, and the resonance peak can be generated in the required range; meanwhile, the power at a short distance cannot be improved, and the production is not reliable.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the deficiencies of the background art, providing a simple structure, high coupling strength's wave filter.

The utility model adopts the technical proposal that: the utility model provides a filter, includes cavity and apron, be equipped with at least one first resonant cavity and at least one second resonant cavity in the cavity, separate the muscle through the metal between every resonant cavity and separate, all assemble the resonance bar in first resonant cavity and the second resonant cavity, be equipped with coupling device between first resonant cavity and an adjacent second resonant cavity, coupling device includes coupling window, flies the pole piece and tuning screw, the coupling window sets up in separating the muscle upper end, it is planar platelike metallic structure to fly the pole piece, it passes to fly the pole piece level coupling window, the one end that flies the pole piece and the resonance bar lateral wall fixed connection in the first resonant cavity, the other end that flies the pole piece and the resonance bar lateral wall interval arrangement in the second resonant cavity, tuning screw passes the apron is located the coupling window.

Furthermore, one side of the flying rod piece is provided with a concave part for tuning the tuning screw rod.

Further, the concave part is an arc-shaped groove or a square groove.

Further, the thickness of the fly rod sheet is 1-2 mm.

Further, one end of the flying rod piece is of a linear structure or an arc structure matched with the side wall of the resonance rod.

Furthermore, one end of the flying rod piece is fixedly connected with the side wall of the resonance rod in a welding mode.

Furthermore, the other end of the flying bar piece is in a linear structure or an arc structure matched with the side wall of the resonant bar.

The utility model relates to a flying bar piece one end and resonance bar fixed connection, the another side forms capacitive coupling with resonance bar interval arrangement, and magnetic field is stronger, and cross capacitive coupling intensity realizes more easily.

The utility model discloses can effectively improve the intensity of coupling, platelike structure's flying rod piece can produce reliable safe interval with the resonant disk, raises the power and avoids the influence to resonant frequency. The welding height of the flying bar piece can be changed to change the strength of cross capacitive coupling; meanwhile, the strength of cross capacitive coupling can be changed corresponding to the change of the distance between the resonant disk and the resonant disk.

Drawings

Fig. 1 is a schematic perspective view of the filter of the present invention (the cover plate is not shown in the figure).

Fig. 2 is a schematic plan view of the filter according to the present invention (the cover plate is not shown).

Fig. 3 is a sectional view taken along the line a-a in fig. 2.

Fig. 4 is a schematic perspective view of another filter according to the present invention (the cover plate is not shown).

Fig. 5 is a schematic diagram of another planar structure of the filter of the present invention (the cover plate is not shown in the figure).

Fig. 6 is a simulation waveform diagram of the prior art.

Fig. 7 is a simulation waveform diagram of the filter of the present invention.

In the figure: 1-a cavity; 2-a first resonant cavity; 3-a second resonant cavity; 4-a resonant rod; 5-separating ribs; 6-a coupling window; 7-a fly rod sheet; 8-a tuning screw; 9-concave part.

Detailed Description

The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Furthermore, the technical features mentioned in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1-5, the present invention provides a filter, which includes a cavity 1 with an open side and a cover plate sealed and covered on the open side of the cavity, wherein at least one first resonant cavity 2 and at least one second resonant cavity 3 are arranged in the cavity 1, each resonant cavity is separated by a metal spacer 5, a resonant rod 4 is assembled in each of the first resonant cavity 2 and the second resonant cavity 3, a coupling device is arranged between the first resonant cavity 2 and an adjacent second resonant cavity 3, the coupling device includes a coupling window 6, a flying rod sheet 7 and a tuning screw 8, the coupling window 6 is arranged at the upper end of the spacer 5, the coupling window 6 is a square opening with an open top, the flying rod sheet 7 is a planar metal structure, the flying rod sheet 7 horizontally passes through the coupling window 6, one end of the flying rod sheet 7 is fixedly connected with the side wall of the resonant rod 4 in the first resonant cavity 2, the other end of the flying rod sheet 7 is arranged at a distance from the side wall of the resonant rod 4 in the second resonant cavity 3, and the bottom end 8 of the tuning screw penetrates through the cover plate and is positioned in the coupling window 6. In fig. 1-3, only two resonator cavities are shown in the form of a filter, and in fig. 4-5, a plurality of first 2 and second 3 resonator cavities are shown.

The utility model relates to a fly 7 one ends of pole piece and resonance bar fixed connection, the another side forms capacitive coupling with resonance bar interval arrangement, and magnetic field is stronger, and cross capacitive coupling intensity realizes more easily.

The utility model discloses can effectively improve the intensity of coupling, platelike structure's flying rod piece 7 can produce reliable safe interval with the resonance dish, raises the power and avoids the influence to the resonance frequency. The welding height of the flying bar piece can be changed to change the strength of cross capacitive coupling; meanwhile, the strength of cross capacitive coupling can be changed corresponding to the change of the distance between the resonant disk and the resonant disk.

In the above scheme, one side of the flying rod piece 7 is provided with a concave part 9 for avoiding the tuning screw, and the concave part 9 is an arc-shaped groove or a square groove. According to the requirement of product parameters, the tuning screw 8 is required to be adjusted until the bottom of the tuning screw is lower than the top surface of the fly rod sheet 7, and the bottom of the tuning screw is in the concave part 9.

In the scheme, the thickness of the flying rod piece 7 is 1-2mm, and the flying rod piece 7 with a plate-shaped structure can generate a reliable safe distance with the resonant disk, so that a resonance peak is prevented from being generated, and the quality of resonance frequency is improved.

In the above scheme, one end of the flying bar piece 7 can be a linear structure or an arc structure matched with the side wall of the resonance rod 4 or a structure with other shapes, and one end of the flying bar piece 7 is fixedly connected with the side wall of the resonance rod 4 in a welding mode. The other end of the flying bar piece 7 can be a linear structure or an arc structure matched with the side wall of the resonance bar, and the other end of the flying bar piece can be a structure with other shapes. The end part of the flying rod piece is of a linear structure, so that the production and the manufacture are more convenient; is of an arc structure and is convenient to be matched with the resonance rod.

In the newly designed product, it is verified that the secondary resonance peak of the filter is obviously superior to that of the conventional scheme under the condition of meeting the electrical standard, as shown in fig. 6 and 7, the safety distance is obviously greater than that of the conventional scheme, and the corresponding power is also guaranteed and improved.

The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered within the protection scope of the present invention. Those not described in detail in this specification are within the skill of the art.

Claims

1. A filter comprises a cavity and a cover plate, wherein at least one first resonant cavity and at least one second resonant cavity are arranged in the cavity, each resonant cavity is separated by a metal separation rib, a resonant rod is assembled in each of the first resonant cavity and the second resonant cavity, and a coupling device is arranged between each first resonant cavity and the corresponding adjacent second resonant cavity, and the filter is characterized in that: the coupling device comprises a coupling window, a flying rod piece and a tuning screw rod, the coupling window is arranged at the upper end of the partition rib, the flying rod piece is of a planar metal structure and horizontally penetrates through the coupling window, one end of the flying rod piece is fixedly connected with the side wall of the resonant rod in the first resonant cavity, the other end of the flying rod piece is arranged at intervals with the side wall of the resonant rod in the second resonant cavity, and the tuning screw rod penetrates through the cover plate and is located in the coupling window.

2. The filter of claim 1, wherein: one side of the flying rod piece is provided with a depressed part for tuning the tuning screw rod.

3. The filter of claim 2, wherein: the depressed part is arc recess or square recess.

4. The filter of claim 1, wherein: the thickness of the flying rod piece is 1-2 mm.

5. The filter of claim 1, wherein: one end of the flying rod piece is of a linear structure or an arc structure matched with the side wall of the resonance rod.

6. The filter of claim 1, wherein: one end of the flying rod piece is fixedly connected with the side wall of the resonance rod in a welding mode.

7. The filter of claim 1, wherein: the other end of the flying rod piece is of a linear structure or an arc structure matched with the side wall of the resonance rod.