CN218448400U

CN218448400U - Novel broadband double-frequency filter

Info

Publication number: CN218448400U
Application number: CN202222709767.4U
Authority: CN
Inventors: 冀伟强; 袁进
Original assignee: Chengdu Mailinte Technology Co ltd
Current assignee: Chengdu Mailinte Technology Co ltd
Priority date: 2022-10-14
Filing date: 2022-10-14
Publication date: 2023-02-03
Anticipated expiration: 2032-10-14

Abstract

The utility model relates to a novel broadband dual-frenquency wave filter, including resonant cavity and a plurality of resonance units of locating in the resonant cavity, resonance unit includes air chamber, resonance post and debugging screw, and the air chamber surrounds resonance post, and the debugging screw inserts resonance capital portion, and a plurality of resonance units form tree structure with double-circuit both ends eight line mode coupling. The utility model has the advantages that: the double-frequency broadband filtering function is realized by adopting a multi-line coupling mode, a double-channel structure is formed, microstrip low-pass is cascaded, and passband harmonic waves can be effectively filtered.

Description

Novel broadband double-frequency filter

Technical Field

The utility model relates to a wireless communication technology field, concretely relates to novel broadband dual-frenquency wave filter.

Background

The filter is a filter circuit consisting of a capacitor, an inductor and a resistor, and can effectively filter a frequency point of a specific frequency in a power line or frequencies except the frequency point to obtain a power signal of the specific frequency or eliminate the power signal of the specific frequency. The cavity filter is used as a common filter in modern industrial production, has the characteristics of high power capacity, small standing wave, easiness in cascade use and the like, and is applied to aviation, aerospace, radars, communication, electronic countermeasure, radio and television and various electronic test equipment.

Although the cavity filter has high Q value and low loss and can realize higher bandwidth, broadband multifrequency is difficult to realize. The patent with publication number CN203644914U discloses a coaxial cavity dual-frequency filter based on a step impedance structure, which uses step impedance coaxial cavity resonator units to realize two pass bands, reduces the volume of the circuit and lowers the manufacturing cost, but the adopted resonator units are distributed in a linear parallel structure, and the whole dual-frequency filter is a single-channel second harmonic frequency doubling dual-frequency filter, which cannot meet the application requirements of multi-channel integration.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's shortcoming, provide a novel broadband dual-band filter, adopt multi-line coupling mode to realize dual-band broadband filtering function to form the binary channels structure, cascade the microstrip low pass, can effectively filtering passband harmonic.

The purpose of the utility model is realized through the following technical scheme:

the utility model provides a novel broadband dual-frenquency wave filter, includes resonant cavity and locates a plurality of resonance units in the resonant cavity, and resonance unit includes air chamber, resonance post and debugging screw, and the air chamber surrounds the resonance post, and the debugging screw inserts resonance capital portion, and a plurality of resonance units form tree structure with double-circuit both ends eight line mode coupling.

Further, resonant cavity is including dismantling the mounting groove and the apron of connecting, and the notch department of mounting groove is located to the apron, and in a plurality of resonance units located the mounting groove, debugging screw connection was on the apron.

Furthermore, a low-pass cavity is arranged at one end of the resonant cavity, a resonant strip line of the micro-strip low-pass is arranged in the low-pass cavity, and the resonant strip line is electrically connected with the tree-shaped structure.

Furthermore, the low-pass cavity comprises an upper base and a lower base which are detachably connected, the upper base is arranged at the top of the lower base, a wire slot is formed in the top surface of the lower base, and a resonance strip wire is arranged in the wire slot.

Furthermore, the tree structure comprises a first resonance unit group and a second resonance unit group which are arranged side by side, the first resonance unit group comprises 5 transversely-arranged resonance units, the second resonance unit comprises 6 transversely-arranged resonance units, and the resonance units at the two ends of the first resonance unit group and the resonance units at the two ends of the second resonance unit group are connected with two coupling lines.

Further, adjusting screws connected with the cover plate are arranged between two adjacent air cavities in the first resonance unit and between two adjacent air cavities in the second resonance unit.

Furthermore, wire holes convenient for the coupled wires to pass through are formed in the two ends of the mounting groove, the wire grooves are communicated with the wire holes, and the 4 coupled wires at one end of the tree-shaped structure close to the mounting groove pass through the wire holes and then are electrically connected with the resonance strip wires.

Furthermore, a welding hole is formed in a resonant column in the resonant unit connected with the coupling line, and the coupling line is inserted into the welding hole and welded with the resonant column.

The utility model has the advantages of it is following:

1. on the basis of a conventional tree-shaped structure filter, a mode of 8 lines at two ends of a double path is adopted to carry out multi-line coupling on a plurality of resonance units, coupling point positions are increased, electromagnetic waves at different positions can be coupled out, more electromagnetic energy is coupled out from a resonance column, a double-frequency broadband filtering function is realized, double channels are formed, and the problem that the broadband of the filter is difficult to realize is solved.

2. The microstrip low pass is added, so that passband harmonic waves can be effectively filtered; through punching on the resonance post, the welding in the coupling line insert hole connects reliable and stable, and the operation easily realizes.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the tree structure of the present invention, with part of the air cavity removed;

FIG. 3 is a schematic structural view of the mounting groove of the present invention;

fig. 4 is a schematic structural view of the middle and lower bases of the present invention.

In the figure: 1. an air chamber; 2. a resonant column; 3. debugging a screw; 4. mounting grooves; 5. a cover plate; 6. a resonant strip line; 7. an upper base; 8. a lower base; 9. a wire slot; 10. a coupling line; 11. a wire hole; 12. a resonant disk; 13. transverse ridges; 14. a coupling window.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following description.

As shown in fig. 1-4, a novel broadband dual-frequency filter comprises a resonant cavity and a plurality of resonant units arranged in the resonant cavity, wherein each resonant unit comprises an air cavity 1, a resonant column 2 and a debugging screw 3, the air cavity 1 surrounds the resonant column 2, and the debugging screw 3 is inserted into the resonant column 2.

As shown in fig. 1 and 3, the resonant cavity includes a mounting groove 4 and a cover plate 5, which are detachably connected, and the cover plate 5 is disposed at the notch of the mounting groove 4 and can be fixed on the mounting groove 4 by bolts to cover the notch. A plurality of resonance units are then located in mounting groove 4, and are concrete, and resonance post 2 is fixed in mounting groove 4, and the counter bore at the top that resonance post 2 top was seted up is inserted to 3 threaded connection of debugging screw on apron 5, adjusts its degree of depth of inserting the counter bore through rotating debugging screw 3 and realizes the tuning function.

In order to realize broadband multifrequency, the utility model discloses a plurality of resonance units form tree structure with double-circuit both ends eight line mode coupling and realize. Specifically, as shown in fig. 2, the tree structure includes a first resonance unit group and a second resonance unit group which are arranged side by side, the first resonance unit group and the second resonance unit group are respectively one path, wherein the first resonance unit group includes 5 transversely arranged resonance units, the second resonance unit includes 6 transversely arranged resonance units, and the resonance units at the two ends of the first resonance unit group and the resonance units at the two ends of the second resonance unit group are both connected with two coupling lines 10, which are eight lines in total. A coupling window 14 is formed between two adjacent resonance units, the coupling between the two adjacent resonance units can be controlled by the window size of the coupling window 14, and a debugging screw 3 is also arranged at the coupling window. Debugging screws 3 connected with a cover plate 5 are arranged between two adjacent air cavities 1 in the first resonance unit and between two adjacent air cavities 1 in the second resonance unit, namely a coupling window 14 is formed between the two adjacent air cavities 1, and coupling adjustment is carried out by adjusting the debugging screws positioned at the coupling window 14. The resonance column 2 in the resonance unit connected with the coupling line 10 is provided with a welding hole, the coupling line 10 is inserted into the welding hole and welded with the resonance column 2, and the operation is easy to realize and the connection is stable and reliable. In addition, preferably, the resonant disk 12 is arranged at the top of the resonant column, so that the capacitor can be loaded; the bottoms of the two resonant columns at the end part of the first resonant unit group and the bottoms of the two resonant columns at the end part of the second resonant unit group are connected through the transverse ridge 13, and then the coupling between the two resonant units is increased by utilizing the transverse ridge 13.

Form this kind of multi-thread coupling mode of tree structure through the coupling of double-circuit both ends eight line mode and make the coupling position increase, and then can couple out the electromagnetic wave at different positions, just also can couple out more electromagnetic energy from resonance post 2, finally realize dual-frenquency broadband filtering function, solve the problem that the wave filter broadband is difficult to realize, first resonance unit group and second resonance unit group have also constituted the binary channels simultaneously, are favorable to realizing the multichannel is integrated.

In addition, as shown in fig. 1 and 4, in order to effectively filter the passband harmonic, a low-pass cavity is disposed at one end of the resonant cavity, and a microstrip low-pass resonant strip line 6 is disposed in the low-pass cavity. Specifically, the low pass cavity is including last base 7 and lower base 8 that can dismantle the connection, go up 7 accessible bolts of base and install 8 tops of base under, go up

base

7 and 4 end connection of base 8 accessible bolts and mounting groove under with, wire casing 9 has been seted up to the top surface of base 8 down, resonance band wire 6 is located in wire casing 9, the line hole 11 that is convenient for coupling line 10 to pass is seted up at 4 both ends of mounting groove, wire casing 9 and line hole 11 intercommunication, 4 coupling lines 10 of the nearly low pass cavity of tree-shaped structure pass behind line hole 11 with resonance band wire 6 electricity is connected. Four coupling lines at one end of the tree-shaped structure close to the low-pass cavity are converged at the output terminal and then connected with the resonance strip line 6, and four coupling lines at one end of the tree-shaped structure far away from the low-pass cavity are converged at the input terminal.

Finally, although embodiments of the present invention have been shown and described in the foregoing description, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. The utility model provides a novel broadband dual-frenquency filter, includes resonant cavity and locates a plurality of resonance units in the resonant cavity, resonance unit includes air chamber (1), resonance post (2) and debugging screw (3), and air chamber (1) surrounds resonance post (2), and debugging screw (3) insert resonance post (2) top, its characterized in that: the multiple resonance units are coupled in a double-path two-end eight-line mode to form a tree structure.

2. The novel wideband dual frequency filter according to claim 1, wherein: resonant cavity is including installing groove (4) and apron (5) that can dismantle the connection, and the notch department of installing groove (4) is located in apron (5), and a plurality of resonance units are located in installing groove (4), and debugging screw (3) are connected on apron (5).

3. The novel wideband dual frequency filter according to claim 2, wherein: one end of the resonant cavity is provided with a low-pass cavity, a micro-strip low-pass resonant strip line (6) is arranged in the low-pass cavity, and the resonant strip line (6) is electrically connected with the tree-shaped structure.

4. The novel wideband dual frequency filter according to claim 3, wherein: the low-pass cavity comprises an upper base (7) and a lower base (8) which are detachably connected, the upper base (7) is arranged at the top of the lower base (8), a wire slot (9) is formed in the top surface of the lower base (8), and a resonance strip wire (6) is arranged in the wire slot (9).

5. The novel wideband dual band filter according to claim 4, wherein: the tree structure comprises a first resonance unit group and a second resonance unit group which are arranged side by side, the first resonance unit group comprises 5 transversely-arranged resonance units, the second resonance unit comprises 6 transversely-arranged resonance units, and the resonance units at the two ends of the first resonance unit group and the resonance units at the two ends of the second resonance unit group are both connected with two coupling lines (10).

6. The novel wideband dual frequency filter according to claim 5, wherein: adjusting screws connected with the cover plate (5) are arranged between two adjacent air cavities (1) in the first resonance unit and between two adjacent air cavities (1) in the second resonance unit.

7. The novel wideband dual band filter according to claim 5, wherein: the wire holes (11) convenient for the coupling wires (10) to pass are formed in the two ends of the mounting groove (4), the wire grooves (9) are communicated with the wire holes (11), and the 4 coupling wires (10) at one end of the tree-shaped structure close to the mounting groove (4) pass through the wire holes (11) and then are electrically connected with the resonance strip wire (6).

8. The novel wideband dual frequency filter according to claim 5, wherein: a welding hole is formed in the resonant column (2) in the resonant unit connected with the coupling line (10), and the coupling line (10) is inserted into the welding hole and welded with the resonant column (2).