CN218770022U - Miniaturized low-end high-suppression cavity filter - Google Patents

Abstract

The utility model relates to a miniaturized low side high suppression cavity filter, including the main part that has input and output, establish the cavity in the main part, establish a plurality of resonance unit in the cavity, establish in the cavity and be located the coupling partition wall between two adjacent resonance unit on the sequence, establish in the cavity and be located the cross coupling partition wall between first and last resonance unit on the sequence, establish section electric capacity and the first end on the cross coupling partition wall and establish on section electric capacity, the second end is the adjustment line of free end, the axis of input and output is not on same straight line, a plurality of resonance unit set up along input to output in proper order in the direction. The application discloses miniaturized low side high suppression cavity filter has compromise the requirement in two aspects of miniaturization and high performance, can produce the zero point at the low side under limited volume prerequisite to realize the demand of low side high suppression.

Description

Miniaturized low-end high-suppression cavity filter

Technical Field

The application relates to the technical field of filters, in particular to a miniaturized low-end high-rejection cavity filter.

Background

The microwave filter functions to pass a desired frequency signal and greatly suppress an undesired frequency signal, and is classified into a microstrip filter, a waveguide filter, a dielectric filter, a cavity filter, and the like according to structural forms.

The cavity filter is made of metal, and the Q value of the cavity filter is high, so that the in-band amplitude-frequency characteristic of the cavity filter is flat, the insertion loss is small, and the out-band rejection is high; meanwhile, the metal processing and manufacturing are convenient, so that the design is flexible, and the design can be carried out according to the customer requirement index and the installation mode; the input and output of the cavity filter are usually matched by 50 omega impedance, standing waves are small, and the cavity filter is easy to cascade.

With the rapid development of communication technology, the cavity filter starts to be miniaturized, but performance parameters (such as low-end rejection) are also reduced correspondingly after the volume is reduced.

Disclosure of Invention

The application provides a miniaturized low-end high-suppression cavity filter, has compromise the requirement in two aspects of miniaturization and high performance, can produce the zero point at the low end under limited volume prerequisite to realize the demand of low-end high suppression.

The above object of the present application is achieved by the following technical solutions:

the application provides a miniaturized low end high rejection cavity filter includes:

a body having an input end and an output end;

a cavity disposed within the body;

the plurality of resonance units are arranged in the cavity, the input end of each resonance unit is connected with the first resonance unit in the sequence, and the output end of each resonance unit is connected with the last resonance unit in the sequence;

the coupling partition wall is arranged in the cavity and positioned between two adjacent resonance units in the sequence;

a cross-coupling partition wall disposed in the cavity and located between the first and last resonant cells in the sequential order;

the slice capacitor is arranged on the cross coupling partition wall; and

the adjusting line is arranged on the slice capacitor;

wherein, the axes of the input end and the output end are not on the same straight line;

the plurality of resonance units are sequentially arranged in a direction from the input terminal to the output terminal.

In one possible implementation of the present application, the resonance unit includes a cylindrical resonance unit and/or a rectangular resonance unit.

In one possible implementation of the present application, the resonance unit includes:

the resonant rods are arranged in the cavity, the input ends of the resonant rods are connected with the first resonant rod in the sequence, and the output ends of the resonant rods are connected with the last resonant rod in the sequence; and

and the screw is arranged on the main body, and one end of the screw enters the cavity and extends into the resonant cavity on the resonant rod.

In one possible implementation of the present application, the angle between the axis of the input end and the axis of the output end is 90 degrees.

In one possible implementation of the present application, the adjustment wire is a silver-plated wire, an enameled wire, or a coaxial cable.

In one possible implementation of the present application, the main body includes a base and a cover plate detachably fixed to the base.

In one possible implementation of the present application, the adjustment line has a plurality of bending angles.

On the whole, the miniaturized low-end high-suppression cavity filter provided by the application has the advantages that the length of the filter is reduced through the nonlinear structure, and the requirement for miniaturization of the size of the filter is met; the low end generates a zero point by introducing a cross coupling mode, and the requirement of high suppression of the low end is met.

Drawings

Fig. 1 is a schematic perspective view of a miniaturized low-end high-rejection cavity filter provided in the present application.

Fig. 2 is a schematic view of an internal structure of a main body provided in the present application.

Fig. 3 is a schematic perspective view of a part in a cavity according to the present application.

Fig. 4 is a schematic structural diagram of a main body provided in the present application.

In the figure, 1, a main body, 2, a cavity, 3, a resonance unit, 5, a coupling partition wall, 6, a cross coupling partition wall, 7, a slice capacitor, 8, an adjusting wire, 11, an input end, 12, an output end, 31, a resonance rod, 32 and a screw.

Detailed Description

The technical solution of the present application will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1 and 2, for the miniaturized low-end high-rejection cavity filter disclosed in the present application, the filter is composed of a main body 1, a cavity 2, resonant units 3, coupling partitions 5, cross-coupling partitions 6, slice capacitors 7, an adjusting line 8, and the like, the main body 1 has an input end 11 and an output end 12, the input end 11 on the main body 1 is connected with the first resonant unit 3 in the sequence, the output end 12 is connected with the last resonant unit 3 in the sequence, a signal to be processed enters the main body 1 through the input end 11, and is sent out through the output end 12 after being processed.

The main body 1 has a cavity 2 therein, and a plurality of resonance units 3 are disposed in the cavity 2, and the resonance units 3 are used for processing signals flowing from the input end 11. A coupling partition 5 is provided in the cavity 2 between two adjacent resonator elements 3 in the sequential series, and a cross-coupling partition 6 is provided in the cavity 2 between the first and last resonator elements 3 in the sequential series.

The axes of the input end 11 and the output end 12 on the main body 1 are not on the same line, and for a plurality of resonant units 3 in the cavity 2, the resonant units 3 are sequentially arranged along the direction from the input end 11 to the output end 12. By this non-linear structure, the length of the filter can be reduced.

In some possible implementations, the axis of the input end 11 and the axis of the output end 12 are at an angle of 90 degrees.

Referring to fig. 3, a chip capacitor 7 is mounted on the cross-coupling partition 6, and specifically, the lower end of the chip capacitor 7 is fixed on the cross-coupling partition 6. The adjustment line 8 is fixed on the chip capacitor 7, and in some possible implementations the adjustment line 8 is fixed on the chip capacitor 7 by soldering with a lower temperature solder paste.

The adjusting line 8 is not in contact with the main body 1 and the resonance unit 3, the structure can enable a transmission zero point to be generated at the low end of the filter, the low-end suppression of the filter is improved, and the position of the zero point can be effectively controlled only by changing the bending angle of the adjusting line during debugging.

In some possible implementations, the conditioning wire 8 is a silver-plated wire, an enameled wire, or a coaxial cable.

The resonance unit 3, the coupling partition 5, the cross-coupling partition 6, the slice capacitor 7 and the adjustment line 8 collectively process a signal input through the input terminal 11. The specific processing mode is as follows:

each resonant rod in the resonant unit 3 is connected through inductive coupling, an adjusting line 8 is fixed through a slice capacitor 7 arranged on a cross coupling partition wall 6, and the adjusting line 8 and the two resonant rods at two ends of the resonant unit 3 generate capacitive cross coupling, so that signals are transmitted from an input end 11 to an output end 12. By means of the capacitive cross-coupling between the line 8 and the resonator unit 3, a zero is generated at the low end of the filter, thus meeting the requirement for high low-end rejection.

On the whole, the miniaturized low-end high-suppression cavity filter provided by the application has the advantages that the length of the filter is reduced through the nonlinear structure, and the requirement for miniaturization of the size of the filter is met;

referring to fig. 3, the resonant unit 3 is composed of resonant rods 31 and screws 32, the resonant rods 31 are located in the cavity 2, and in some possible ways, the resonant rods 31 are formed integrally with the main body 1, the number of resonant rods 31 is multiple, the input end 11 is connected to the first resonant rod 31 in the sequential sequence, and the output end 12 is connected to the last resonant rod 31 in the sequential sequence. A screw 32 is provided on the body 1, one end of the screw 4 entering into the cavity 2 and protruding into the resonant cavity on the resonant bar 31.

The resonant unit 3 has two forms, one is a cylindrical resonant unit, and the other is a rectangular resonant unit, where the cylindrical and rectangular shapes refer to the shapes of the sectional shapes including the sectional shape of the resonant rod 31, the sectional shape of the resonant cavity, and the sectional shape of the screw 4.

Referring to fig. 4, as a specific embodiment of the miniaturized low-end high-rejection cavity filter provided by the present application, the main body 1 includes a base 13 and a cover plate 14 detachably fixed on the base 13, the resonant rod 31 is located on the base 13, and the screw 32 is located on the cover plate 14.

In some possible implementations, the cover plate 14 has threaded holes, and the screws 32 are fixed to the cover plate 14 through the threaded holes. The main body 1 with the structure can remove the cover plate 14 from the base 13 when needed, and the position of zero point generation can be effectively controlled by changing the bending angle of the adjusting line 8 when debugging.

As shown in fig. 3, when the two ends of the adjusting wire 8 are bent outward, the capacitive cross coupling increases, the zero point at the lower end is closer to the passband, and the near-end rejection is better; on the contrary, when the two ends of the adjusting wire 8 are bent inwards, the capacitive cross coupling is reduced, the low-end zero point is further away from the passband, and the far-end suppression is better.

The embodiments of the present invention are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (7)

1. A miniaturized low-end high rejection cavity filter, comprising:

a body (1) having an input end (11) and an output end (12);

a cavity (2) arranged in the main body (1);

a plurality of resonant cells (3) arranged in the cavity (2), the input end (11) being connected to the first resonant cell (3) in the sequence, the output end (12) being connected to the last resonant cell (3) in the sequence;

a coupling partition (5) arranged in the cavity (2) and located between two adjacent resonance units (3) in a sequential sequence;

a cross-coupling partition (6) provided in the cavity (2) and located between the first and last resonant cells (3) in the sequential order;

the slice capacitor (7) is arranged on the cross coupling partition wall (6); and

the adjusting line (8) is arranged on the slice capacitor (7);

wherein the axes of the input end (11) and the output end (12) are not on the same straight line;

a plurality of resonance units (3) are arranged in sequence in the direction from the input end (11) to the output end (12).

2. A miniaturized low-end high rejection cavity filter according to claim 1, wherein the resonator element (3) comprises a cylindrical resonator element and/or a rectangular resonator element.

3. A miniaturized low-end high-rejection cavity filter according to claim 1 or 2, wherein the resonator unit (3) comprises:

the resonant rods (31) are arranged in the cavity (2), the input end (11) is connected with the first resonant rod (31) in the sequence, and the output end (12) is connected with the last resonant rod (31) in the sequence; and

and the screw (32) is arranged on the main body (1), and one end of the screw (32) enters the cavity (2) and extends into the resonant cavity on the resonant rod (31).

4. The miniaturized low-end high rejection cavity filter according to claim 1, wherein the axis of the input end (11) and the axis of the output end (12) form an angle of 90 degrees.

5. The miniaturized low-end high-rejection cavity filter according to claim 1, wherein the tuning wire (8) is a silver-plated wire, an enameled wire, or a coaxial cable.

6. The miniaturized low-end high rejection cavity filter according to claim 1, wherein the body (1) comprises a base (13) and a cover (14) removably secured to the base (13).

7. A miniaturized low-end high rejection cavity filter according to claim 6, wherein the tuning line (8) has a plurality of bending angles.

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