Structure for solving synchronous tuning of coaxial mechanical tuned filter

Abstract

The utility model discloses a structure for solving synchronous tuning of a coaxial mechanically tuned filter, which belongs to the technical field of microwave filters and comprises five parallel coaxial cavities, tuning rods in the coaxial cavities, double-coupling hole structures between adjacent cavities and input and output structures. The cavity bodies of the five parallel-row coaxial cavities are the same in size and are symmetrically distributed, the number of the cavity bodies can be N, and the coaxial cavity bodies can be arranged in a parallel-row mode or other flexible modes. The tuning rods in the coaxial cavity are symmetrically distributed, the diameters of the tuning rods are different, the middle of the tuning rods is thick, and the two sides of the tuning rods are thin. The double-coupling junction hole structure between the adjacent cavities is formed by forming two regular coupling holes in the common wall of the adjacent cavities, and the coupling between the whole cavities is symmetrically distributed. By changing the diameter of the resonance rod in the coaxial cavity, the problem of asynchronous high-frequency mechanical tuning is solved, and meanwhile, the bandwidth difference in the whole tuning range can be reduced by adopting the double coupling holes.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of structure for solving the synchronous tuning of coaxial mechanical tuning filter, belong to microwave filter technical field. BACKGROUND

[0002] With the increase of communication equipment frequency, the demand of high frequency mechanical tuning filter increases, and one problem to be solved by high frequency mechanical tuning filter is to find a structure method to meet the problem of high frequency synchronous tuning, and the structure is easy to process and debug.

[0003] In the prior art, the Chinese utility model patent with patent No.CN201410763893.5 discloses a "wide tuning coaxial electric tuning filter and debugging method thereof", which uses adjustable compensation screws arranged outside the resonant cavity to realize frequency compensation in the full frequency band. This method is applied to high frequency mechanical tuning filter. The Chinese utility model patent with patent No.CN201910110641.5 discloses a "high-selectivity electric tuning coaxial filter with constant absolute bandwidth", which uses a coaxial tuning rod connected to a frequency adjustment circuit at one end to realize a frequency-adjustable resonator. It is suitable for low frequency band, and the volume is reduced in high frequency band. However, the space does not meet the requirements, and the high frequency mechanical adjustable filter has the problem of frequency asynchronization. This structure cannot solve the problem. UTILITY MODEL CONTENTS

[0004] The utility model aims to overcome the above-mentioned shortcomings, and provides a method for solving the synchronous tuning of mechanical tuning filter. The utility model is characterized by changing the size of the tuning rod in the cavity to realize synchronous tuning and easy processing.

[0005] The utility model adopts the technical scheme:

[0006] A structure for solving the synchronous tuning of coaxial mechanical tuning filter includes five coaxial cavities arranged in a row. The cavities are coupled by double coupling holes between adjacent coaxial cavities. Each coaxial cavity is provided with a tuning rod, which penetrates from the bottom wall of the coaxial cavity to the inside of the coaxial cavity,

[0007] The cavity wall of the first-end coaxial cavity is provided with a filter input end, and the cavity wall of the last-end coaxial cavity is provided with a filter output end.

[0008] The inner side of the cavity wall where the filter input end and the filter output end are located is provided with a coupling ring.

[0009] Further, the double coupling holes include a main coupling hole and a secondary coupling hole. The main coupling hole and the secondary coupling hole are arranged above and below, and the secondary coupling hole is located above the main coupling hole. The secondary coupling hole is a rectangular hole, and the main coupling hole is a right-angle trapezoidal hole.

[0010] Further, the coupling ring is a type structure, both ends of which are connected to the corresponding cavity wall.

[0011] Further, the bottom side of the right-angled trapezoidal hole is adjacent to the secondary coupling hole, and the right-angled side of the right-angled trapezoidal hole is located on the same vertical line with one short side of the rectangular hole.

[0012] Further, the coaxial cavities in the row are left-right symmetrical about the central axis, and the diameter of the tuning rod decreases from the middle to the sides.

[0013] Further, the filter output end is a coaxial port or a waveguide port.

[0014] Further, the five coaxial cavities are in a row.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model discloses a structure mode of changing the diameter of the tuning rod in the cavity and solves the problem of the different step of the high-frequency mechanical tuning filter, and the double coupling holes between the cavities can reduce the bandwidth difference in the whole tuning range, so that the high-frequency mechanical tuning filter is easy to process and realize. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the front view of the coaxial mechanical tuning filter internal structure of the utility model

[0018] Figure 2 is Figure 1 the section view of B-B;

[0019] Figure 3 is the isometric view of the coaxial mechanical tuning filter of the utility model;

[0020] Wherein 1 is the filter cavity, 2 is the tuning rod, 2_1 is the tuning rod of the first cavity, 2_2 is the tuning rod of the second cavity, 2_3 is the tuning rod of the third cavity, 2_4 is the tuning rod of the fourth cavity, 2_5 is the tuning rod of the fifth cavity, 3 is the secondary coupling hole, 4 is the primary coupling hole, 5 is the filter coupling ring, and 6 is the filter input and output end. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the utility model patent embodiment clearer, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment, of course, the described content is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0022] A structure to solve the problem of synchronous tuning of coaxial mechanical tuning filter, the structure contains five coaxial cavities in line, the frequency change is realized by the tuning rods of coaxial cavities together, the inter-cavity coupling is realized by double coupling holes between adjacent coaxial cavities. The inter-cavity coupling of coaxial mechanical tuning filter between adjacent cavities is realized by double coupling holes, and the inter-cavity coupling is symmetrically distributed. The tuning rods inside the coaxial cavities can be symmetric or asymmetric according to the arrangement structure, and the diameter of the tuning rods can be adjusted according to the needs of synchronization. The number of coaxial cavities can be N, the arrangement of coaxial cavities can be in line, side by side, or other flexible forms. The output end of the coaxial mechanical tuning filter can be a coaxial port or a waveguide port.

[0023] Figure 1 The right side is the cavity structure of a five-cavity coaxial mechanical tuning filter, five coaxial cavities in line, 2_1 is the tuning rod of the first cavity, 2_2 is the tuning rod of the second cavity, 2_3 is the tuning rod of the third cavity, 2_4 is the tuning rod of the fourth cavity, and 2_5 is the tuning rod of the fifth cavity. The frequency change is realized by the tuning rods of the first cavity, the tuning rods of the second cavity, the tuning rods of the third cavity, the tuning rods of the fourth cavity, and the tuning rods of the fifth cavity together, 3 is the secondary coupling hole, 4 is the main coupling hole, 5 is the filter coupling ring, 6 is the filter input and output end, and the inter-cavity coupling is realized by 3 and 4 between adjacent coaxial cavities. Figure 1 In the middle, 2_1 and 2_5 are equal in radius, 2_2 and 2_4 are equal in radius, and 2_3 has a larger diameter than 2_1, 2_2, 2_4, and 2_5. The five-cavity mechanical tuning filter has the same cavity size, the tuning rods are left-right symmetric, and the double coupling holes 3 and 4 between the filter cavities are left-right symmetric relative to the entire filter, Figure 1 The left side is a cross-sectional view of the mechanical tuning filter cavity, Figure 2 is a 45-degree axonometric view.

Claims

1. A structure for resolving simultaneous tuning of coaxial mechanical tuning filters, characterized by, Five coaxial cavities are arranged in line; the cavities are coupled through double coupling holes; a tuning rod is arranged in each coaxial cavity, The filter input end is arranged on the wall of the first coaxial cavity; the filter output end is arranged on the wall of the last coaxial cavity; The inner side of the wall of the filter input end and the filter output end is provided with a coupling ring.

2. The structure for solving the problem of synchronous tuning of coaxial mechanical tuning filter according to claim 1, characterized in that, The double coupling holes include a main coupling hole and a secondary coupling hole; the main coupling hole and the secondary coupling hole are arranged in an up-down manner, and the secondary coupling hole is above the main coupling hole; the secondary coupling hole is a rectangular hole; the main coupling hole is a right-angled trapezoidal hole.

3. The structure for solving the problem of synchronous tuning of coaxial mechanical tuning filter according to claim 1, characterized in that, The coupling ring is a U-shaped structure, and both ends of the coupling ring are connected to the corresponding wall of the cavity.

4. The structure for solving the problem of synchronous tuning of coaxial mechanical tuning filter according to claim 2, characterized in that, The bottom side of the right-angled trapezoidal hole is adjacent to the secondary coupling hole; and the right angle side of the right-angled trapezoidal hole is on the same vertical line as one of the short sides of the rectangular hole.

5. The structure for solving the problem of synchronous tuning of coaxial mechanical tuning filter according to claim 1, characterized in that, The coaxial cavities are arranged in line and are symmetrical about the central axis; the diameter of the tuning rod decreases from the middle to the sides.

6. The structure for solving the problem of synchronous tuning of coaxial mechanical tuning filter according to claim 1, characterized in that, The filter input end and the filter output end are coaxial ports or waveguide ports.

7. The structure for solving the problem of synchronous tuning of coaxial mechanical tuning filter according to claim 1, characterized in that, The five coaxial cavities are arranged in line.

Images