Adjustable filter structure, adjustable filter and duplexer

Abstract

The application discloses an adjustable filter structure, an adjustable filter and a duplexer, and relates to the technical field of communication equipment. The adjustable filter structure comprises a first waveguide, a plurality of first resonant cavities are formed in the first waveguide; a second waveguide, the second waveguide is arranged opposite to and spaced from the first waveguide; a plurality of second resonant cavities are formed in the second waveguide, and the second resonant cavities are arranged in communication with the first resonant cavities one by one; a middle cavity block, the middle cavity block is arranged between the first waveguide and the second waveguide, the middle cavity block is provided with a first channel that is in communication with the first resonant cavities and the second resonant cavities; the middle cavity block is provided with a mounting groove, the mounting groove is in communication with the first channel; and a dielectric diaphragm, the dielectric diaphragm is movably arranged in the mounting groove, and the thickness of the dielectric diaphragm is matched with the width of the mounting groove. The adjustable filter and the duplexer apply the above structure. The adjustable filter structure can make the adjustable filter and the duplexer that apply the adjustable filter structure have better adjustment performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, in particular to an adjustable filter structure, an adjustable filter and a duplexer. BACKGROUND

[0002] Filters are widely used as a frequency selection device. With the development of wireless communication, different filter structures appear to meet different application environments, especially adjustable filter structures are widely used. The existing adjustable filter structure is realized by a tuning mechanism, such as a single diaphragm filter plus a dielectric rod driving a high dielectric moving piece to realize tuning, but the bandwidth of the single diaphragm is limited. The existing adjustable filter structure with double diaphragms usually tunes on one side, and the tuning performance is poor. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, an adjustable filter structure is proposed, which can make the adjustable filter and the duplexer using the adjustable filter structure have better tuning performance.

[0004] In a first aspect, an adjustable filter structure according to an embodiment of the present application comprises:

[0005] A first waveguide body, the first waveguide body is formed with a plurality of first resonant cavities;

[0006] A second waveguide body, the second waveguide body is arranged opposite and spaced apart from the first waveguide body; the second waveguide body is formed with a plurality of second resonant cavities, the second resonant cavities are arranged in one-to-one communication with the first resonant cavities;

[0007] An intermediate cavity block, the intermediate cavity block is arranged between the first waveguide body and the second waveguide body, the intermediate cavity block is provided with a first channel communicating the first resonant cavities and the second resonant cavities; the intermediate cavity block is provided with a mounting slot in communication with the first channel, the first distance from the first waveguide body and the second distance from the second waveguide body of the mounting slot are the same;

[0008] A dielectric diaphragm, the dielectric diaphragm is movably arranged in the mounting slot, and part of the structure of the dielectric diaphragm is located in the first channel, the thickness of the dielectric diaphragm matches the width of the mounting slot.

[0009] According to the above embodiment of the present application, at least the following beneficial effects are achieved: the installation groove matched with the dielectric film sheet is arranged in the intermediate cavity block, after the dielectric film sheet is inserted into the dielectric film sheet, the electromagnetic field leakage is small, at this time, the dielectric film sheet is moved up and down in the middle of the first waveguide body and the second waveguide body to adjust the depth of the part structure located in the first channel and then to tune, the tuning is more linear, and the corresponding bandwidth changes little each time the adjustment is made. Therefore, compared with the traditional adjustable filtering structure, the dielectric film sheet of the present application can have higher accuracy each time the adjustment is made without changing the size of the first resonant cavity and the second resonant cavity, therefore, the adjustable filtering structure of the embodiment of the present application can make the adjustable filter and the duplexer using the adjustable filtering structure have better adjustment performance.

[0010] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0011] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0012] Figure 1 is a sectional view of the adjustable filtering structure of the embodiment of the present application;

[0013] Figure 2 is a structural schematic view of the adjustable filtering structure of the embodiment of the present application;

[0014] Figure 3 is another perspective structural schematic view of the intermediate cavity block of the embodiment of the present application;

[0015] Figure 4 is a side view of the dielectric film sheet of the embodiment of the present application.

[0016] REFERENCE NUMERALS:

[0017] first waveguide body 110, second waveguide body 120, first screw hole 130, second screw hole 140, resonant groove 150,

[0018] intermediate cavity block 200, first channel 210, first intermediate cavity block 220, second intermediate cavity block 230, tuning hole 240, through groove 250, installation groove 260,

[0019] dielectric film sheet 300, comb sheet 310, sheet block 311, driving connection structure 320,

[0020] tuning screw 400,

[0021] first metal sheet 510, second metal sheet 520. DETAILED DESCRIPTION

[0022] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explaining the present application, and should not be understood as a limitation of the present application.

[0023] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the purpose of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. If it is described as first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features or the sequence of the indicated technical features. Wherein, several means one or more than one.

[0024] In the description of the present application, unless otherwise explicitly limited, the words such as arrangement, installation, connection, etc. should be understood broadly, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0025] The adjustable filter structure of the present application is described below with reference to the drawings.

[0026] As shown in the embodiments of Figure 1 and Figure 2 The present application provides an adjustable filter structure, comprising:

[0027] A first waveguide 110 is formed with a plurality of first resonant cavities;

[0028] A second waveguide 120 is arranged opposite and spaced apart from the first waveguide 110; the second waveguide 120 is formed with a plurality of second resonant cavities, and the second resonant cavities are arranged in one-to-one communication with the first resonant cavities;

[0029] An intermediate cavity block 200 is arranged between the first waveguide 110 and the second waveguide 120, and the intermediate cavity block 200 is provided with a first channel 210 communicating the first resonant cavities and the second resonant cavities; the intermediate cavity block 200 is provided with a mounting groove 260 in communication with the first channel 210, and the first distance from the first waveguide 110 and the second distance from the second waveguide 120 are the same;

[0030] The medium diaphragm 300 is movably arranged in the mounting groove 260, and part of the structure of the medium diaphragm 300 is located in the first channel 210. The thickness of the medium diaphragm 300 matches the width of the mounting groove 260.

[0031] Therefore, the mounting groove 260 matched with the medium diaphragm 300 is arranged in the intermediate cavity block 200, the insulating medium diaphragm 300 is inserted into the medium diaphragm 300, the electromagnetic field leakage is small, at this time, the depth of the part of the structure located in the first channel is adjusted by moving the medium diaphragm 300 up and down on the middle part of the first waveguide 110 and the second waveguide 120, and then the tuning is performed, the tuning is more linear, and the corresponding bandwidth change is small each time. Therefore, compared with the traditional adjustable filter structure, the medium diaphragm 300 of the application can have higher accuracy each time without changing the size of the first resonant cavity and the second resonant cavity, and therefore, the adjustable filter structure of the embodiment of the application can make the adjustable filter and the duplexer using the adjustable filter structure have better adjustment performance.

[0032] It should be noted that the embodiment of the application is tuned by moving the medium diaphragm 300 up and down in the middle part of the adjustable filter structure, so that only the area of the communication between the first resonant cavity and the second resonant cavity is affected, and the size of the first resonant cavity and the second resonant cavity is not affected. The first resonant cavity can be formed by the structure of the first waveguide 110 itself, or can be formed by the first metal sheet 510 and the first waveguide 110. The formation of the second resonant cavity is the same.

[0033] It should be noted that the medium diaphragm 300 is made of a material with low dielectric constant, high Q value and low thermal expansion coefficient. The medium diaphragm 300 can change the depth of entering the first channel 210 under the drive of the motor, at this time, the medium diaphragm 300 generates resonant perturbation through the first channel 210 and the first resonant cavity and the second resonant cavity, thereby changing the resonant frequency, and the low thermal expansion coefficient ensures that the product has small temperature drift and small standing wave change under high and low temperature conditions. Taking a stepper motor as an example, the stepping progress is controlled at 8 μm, the center frequency movement of the adjustable filter structure and the distance of the medium diaphragm 300 into the first channel 210 are almost linear, so it is easy to control the required center frequency when adjusting, thereby ensuring the frequency accuracy.

[0034] It can be understood that the intermediate cavity block 200 includes a first intermediate cavity block 220 and a second intermediate cavity block 230, the first intermediate cavity block 220 and the second intermediate cavity block 230 are arranged at intervals and form the first channel 210, and the first intermediate cavity block 220 is provided with the mounting groove 260.

[0035] It should be noted that the first intermediate cavity block 220 and the second intermediate cavity block 230 are symmetrically arranged, and the division of the intermediate cavity block 200 into two independent first intermediate cavity blocks 200 and second intermediate cavity blocks 200 is more convenient for processing.

[0036] It can be understood that the second intermediate cavity block 230 is provided with a plurality of tuning holes 240, and the tuning holes 240 are arranged one by one corresponding to the first resonant cavity.

[0037] It should be noted that, with reference to the embodiments shown in Figure 2 The tuning holes 240 are arranged at the bottom of the second intermediate cavity block 230. It should be noted that in some embodiments, one side of the bottom of the second intermediate cavity block 230 is concave, so that the tuning screw 400 does not protrude too much after passing through the tuning hole 240.

[0038] It can be understood that the tunable filter structure further comprises a tuning screw 400, the tuning screw 400 is provided with a plurality of tuning screws, and the tuning screw 400 is arranged one by one corresponding to the tuning hole 240, and the tuning hole 240 is a through hole.

[0039] It should be noted that by arranging the tuning screw 400, the yield of the product can be improved.

[0040] It can be understood that the dielectric film 300 is provided with a plurality of groups of comb-shaped pieces 310, and the plurality of groups of comb-shaped pieces 310 are arranged at intervals. The bottom of the mounting groove 260 is provided with a plurality of through grooves 250, and the through grooves 250 are arranged one by one corresponding to the comb-shaped pieces 310 and are communicated with the first channel 210. Part of the structure of the comb-shaped piece 310 passes through the through groove 250 and enters the first channel.

[0041] It should be noted that the comb-shaped piece 310 is composed of a plurality of adjacent piece blocks 311, with reference to the embodiments shown in Figure 4 The comb-shaped piece 310 includes two adjacent piece blocks 311. Each group of comb-shaped pieces 310 passes through the corresponding first channel 210 and enters the first channel 210, at which time the electromagnetic field leakage is less.

[0042] It can be understood that the first waveguide 110, the second waveguide 120, and the intermediate cavity block 200 are provided with a plurality of first screw holes 130, and each first screw hole 130 is located between two adjacent groups of comb-shaped pieces 310.

[0043] It should be noted that the first waveguide 110, the second waveguide 120, and the intermediate cavity block 200 are detachably connected. By arranging the first screw hole 130 between the two adjacent groups of comb-shaped pieces 310, the movement of the dielectric sheet is not affected, and at the same time, the first waveguide 110, the second waveguide 120, and the intermediate cavity block 200 can be connected more stably.

[0044] It should be noted that the first screw hole 130 and the second screw hole 140 can be respectively arranged on the first waveguide body 110, the second waveguide body 120, and the intermediate cavity block 200, and the screws pass through the first screw hole 130 and the second screw hole 140 from one side of the adjustable filter structure to realize fixation. For example, referring to the embodiments shown in Figure 1 and Figure 2 , the first intermediate cavity block 220 of the intermediate cavity block 200 is provided with the first screw hole 130. Referring to the embodiments shown in Figure 1 and Figure 2 , the first waveguide body 110, the second waveguide body 120, and the second intermediate cavity block 230 are provided with the second screw hole 140, and the second screw hole 140 is arranged staggered with the tuning hole 240.

[0045] It can be understood that the driving connection structure 320 is arranged on the side of the dielectric film 300 away from the intermediate cavity block 200.

[0046] It should be noted that the driving connection structure 320 can be connected to the driving end of the connecting rod or the driving part for adjusting the dielectric film 300, such as the driving end of the motor. The driving connection structure 320 can be connected to the connecting hole as shown in Figure 4 .

[0047] It can be understood that the adjustable filter structure further comprises:

[0048] The first metal sheet 510 is arranged between the first waveguide body 110 and the intermediate cavity block 200, and the first metal sheet 510 divides the first waveguide body 110 into a plurality of first resonance cavities.

[0049] The second metal sheet 520 is arranged between the second waveguide body 120 and the intermediate cavity block 200, and the second metal sheet 520 divides the corresponding second waveguide body 120 into a plurality of second resonance cavities.

[0050] It should be noted that the first waveguide body 110 and the second waveguide body 120 are both provided with a resonance groove 150 opening towards the intermediate cavity block 200, and the size of the resonance groove 150 is matched with the first channel 210 and is arranged correspondingly. The first metal sheet 510 divides the corresponding resonance groove 150 into a plurality of first resonance cavities. The second metal sheet 520 divides the corresponding resonance groove 150 into a plurality of second resonance cavities.

[0051] It should be noted that the double diaphragm structure formed by the first metal sheet 510 and the second metal sheet 520 ensures that the adjustable filter has low insertion loss and good out-of-band rejection during tuning, compared with the single diaphragm scheme. The double diaphragm structure can overcome the difficulty of processing the very thin input and output diaphragm thickness in the wideband structure by pulling the distance between the first metal sheet 510 and the second metal sheet 520 far apart. At the same time, using the double diaphragm, the out-of-band rejection does not deteriorate during movement, which is convenient for design.

[0052] In another aspect, the application also provides an adjustable filter and a duplexer, which comprise the adjustable filter structure described above.

[0053] The adjustable filter of the embodiments of the application will be described below with reference to the embodiments of the application in Figures 1 to Figure 4 The adjustable filter comprises a first waveguide 110, a second waveguide 120, an intermediate cavity block 200, a dielectric diaphragm 300, a first metal sheet 510, and a second metal sheet 520.

[0054] The first metal sheet 510 is arranged between the first waveguide 110 and the intermediate cavity block 200, and the first metal sheet 510 divides the first waveguide 110 into a plurality of first resonant cavities. The second metal sheet 520 is arranged between the second waveguide 120 and the intermediate cavity block 200, and the second metal sheet 520 divides the corresponding second waveguide 120 into a plurality of second resonant cavities. The second waveguide 120 is arranged opposite and spaced apart from the first waveguide 110. The second resonant cavities are arranged in one-to-one communication with the first resonant cavities. The intermediate cavity block 200 is arranged between the first waveguide 110 and the second waveguide 120, and the intermediate cavity block 200 is provided with a first channel 210 that communicates the first resonant cavities and the second resonant cavities. The intermediate cavity block 200 is provided with a mounting groove 260 that communicates with the first channel 210. The dielectric diaphragm 300 is movably arranged in the mounting groove 260, and the thickness of the dielectric diaphragm 300 matches the width of the mounting groove 260. The intermediate cavity block 200 comprises a first intermediate cavity block 220 and a second intermediate cavity block 230, which are arranged spaced apart and form the first channel 210. The first intermediate cavity block 220 is provided with the mounting groove 260. The second intermediate cavity block 230 is provided with a plurality of tuning holes 240, which are arranged in one-to-one correspondence with the first resonant cavities.

[0055] In the description of the application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description of the application, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] Although the embodiments of the application have been shown and described, it should be understood by those ordinary skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the claims and their equivalents.

[0057] The embodiments of the application are described in detail above in combination with the drawings, but the application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application.

Claims

1. A tunable filter structure, characterized in that: include: a first waveguide body, wherein the first waveguide body is formed with a plurality of first resonant cavities; a second waveguide body, the second waveguide body being opposite to and spaced from the first waveguide body; the second waveguide body forming a plurality of second resonant cavities, the second resonant cavities being connected to the first resonant cavities one by one; an intermediate cavity block, the intermediate cavity block being disposed between the first waveguide body and the second waveguide body, the intermediate cavity block being provided with a first channel communicating with the first resonant cavity and the second resonant cavity; the intermediate cavity block being provided with a mounting groove communicating with the first channel, the mounting groove being at the same first distance from the first waveguide body and second distance from the second waveguide body; a dielectric diaphragm, the dielectric diaphragm being movably disposed in the mounting slot and partially located within the first channel; the thickness of the dielectric diaphragm matching the width of the mounting slot; and the depth of the dielectric diaphragm entering the first channel being varied by a motor; a first metal sheet, the first metal sheet being arranged between the first waveguide body and the intermediate cavity block; a second metal sheet, the second metal sheet being arranged between the second waveguide body and the intermediate cavity block; Among them, the first waveguide body and the second waveguide body are both provided with a resonant slot opening toward the intermediate cavity block; the first metal sheet divides the corresponding resonant slot into a number of first resonant cavities; the second metal sheet divides the corresponding resonant slot into a number of second resonant cavities; the intermediate cavity block includes a first intermediate cavity block and a second intermediate cavity block, the first intermediate cavity block and the second intermediate cavity block are arranged at intervals and form the first channel, the size of the resonant slot matches the first channel and is arranged accordingly; the first intermediate cavity block is provided with the mounting slot; the second intermediate cavity block is provided with a number of tuning holes, and the tuning holes are arranged one-to-one corresponding to the first resonant cavity.

2. The tunable filter structure according to claim 1, characterized in that: Also includes: There are several tuning screws, which are arranged in one-to-one correspondence with the tuning holes, and the tuning holes are through holes.

3. The tunable filter structure according to claim 1, wherein: The dielectric diaphragm is provided with multiple groups of comb-shaped sheets, and the multiple groups of comb-shaped sheets are arranged at intervals. The bottom of the mounting groove is provided with multiple through grooves, and the through grooves are arranged in a one-to-one correspondence with the comb-shaped sheets and connected to the first channel. Part of the structure of the comb-shaped sheets passes through the through grooves and enters the first channel.

4. The tunable filter structure according to claim 3, characterized in that: The first waveguide body, the second waveguide body, and the intermediate cavity block are all provided with a plurality of first screw holes, and each of the first screw holes is located between two adjacent groups of comb-shaped pieces.

5. The tunable filter structure according to claim 1, characterized in that: A driving connection structure is provided on a side of the dielectric diaphragm away from the middle cavity block.

6. A tunable filter, characterized in that: The invention comprises the adjustable filter structure according to any one of claims 1 to 5.

7. A duplexer, characterized in that: The invention comprises the adjustable filter structure according to any one of claims 1 to 5.

Images