CN108281741B - TE01 mould dielectric filter of easy processing debugging - Google Patents
TE01 mould dielectric filter of easy processing debugging Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators
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Abstract
A TE01 mode dielectric filter easy to machine and debug comprises a cavity, a cover plate, a dielectric resonator, a cross bar screw coupling mechanism, a tuning screw and an SMA (shape memory alloy) electric connector. The invention is characterized in that the cross coupling of the filter is positive, the main coupling is provided with two cross rod screw coupling mechanisms to realize negative coupling, and the cross rod screw coupling mechanisms are respectively positioned between the dielectric resonators R4 and R5 and between the dielectric resonators R9 and R10, and compared with the prior art, the position can be changed; the filter has no negative cross coupling of a probe structure, the parasitic coupling is very small, the hole of the cross rod screw coupling mechanism is a common through hole, and the processing technology is simple because the hole is processed by a milling cutter; the relative bandwidth of the filter is twice as wide as that of a common filter; the coupling amount can be continuously adjusted by the screws of the cross bar screw coupling mechanism, so that the coupling amount can be continuously adjusted, the cover plate is not required to be detached completely, and the debugging is simple; the cross rod screw coupling mechanism of the filter has no small distance and high product reliability.
Description
Technical Field
The invention relates to a TE01 mode dielectric filter easy to process and debug, and belongs to the field of microwave passive components.
Background
Compared with the traditional thin-wall invar round cavity dual-mode input multiplexer, the medium input multiplexer has the advantages of small volume, light weight, excellent performance and small frequency temperature coefficient, and is widely applied at home and abroad. At present, TE01 mode dielectric filters can be used for the dielectric input multiplexers from the L band to the Ka band, and the channel filters constituting the dielectric input multiplexers are usually high-order narrow-band filters, i.e. ten-order self-balanced TE01 mode dielectric filters.
Related articles and patents in China and abroad are searched, and one domestic patent about a ten-order TE01 mode dielectric filter is a patent number ZL201110181357.0, as shown in figure 11. There are many other articles or patents in the world describing TE01 mode dielectric filters, but only one patent international patent WO 95/27317, which refers to a ten-order self-equalizing dielectric filter, is shown in fig. 10. The main coupling of the ten-order self-balanced TE01 mode dielectric filter introduced by the two patents is positive, the cross coupling is positive or negative, the positive coupling of the filter is realized by using holes, the negative coupling is realized by using probes, the parasitic coupling of the dielectric filter with the structure is very large, the transmission response of the filter which is supposed to be symmetrical is inclined, and therefore the influence of the parasitic coupling must be overcome. The influence of parasitic coupling is overcome by introducing double-layer negative coupling probes in national patent ZL201110181357.0, and the influence of parasitic coupling is overcome by introducing redundant cross coupling in international patent WO 95/27317. The former has the disadvantages that the double-layer negative coupling probe is complex in shape, sensitive to length, not easy to calculate accurately, the length of the probe needs to be modified by repeatedly opening the cover plate, and the debugging is complex, and the latter has the disadvantages that the product structure is complex and the reliability is reduced due to the introduction of redundant cross coupling. As shown in fig. 12, in the domestic patent CN104218281B, the number of times of detaching the cover plate is reduced by the T-shaped coupling rod, but the continuously adjustable coupling amount cannot be achieved, the coupling hole for installing the T-shaped coupling rod needs to be processed by an electric spark process, and when the bandwidth of the filter is narrow, the T-shaped coupling rod has a small distance, which affects the reliability.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the TE01 mode dielectric filter is easy to process and debug, small in parasitic coupling, easy to process, high in reliability and capable of avoiding repeated cover removal and debugging, and the relative bandwidth of the filter is increased.
The technical solution of the invention is as follows:
a TE01 mode dielectric filter easy to machine and debug comprises a cavity, a cover plate, an SMA electrical connector, tuning screws and a dielectric resonator, wherein the SMA electrical connector is arranged on one side of the cavity, ten cylindrical cavities are arranged in the cavity, the cylindrical cavities are arranged in two rows side by side, and the cylindrical cavities in the same row are communicated through coupling holes; the first row of cylindrical cavities are sequentially numbered as a first cavity, a second cavity, … and a fifth cavity, wherein the first cavity is close to the SMA electrical connector and the SMA electrical connector extends into the first cavity; the second row of cylindrical cavities are numbered as a tenth cavity, a ninth cavity and an … sixth cavity in sequence, wherein the tenth cavity is close to the SMA electrical connector and the SMA electrical connector extends into the tenth cavity; coupling holes are formed between the second cavity and the ninth cavity, between the third cavity and the eighth cavity, and between the fifth cavity and the sixth cavity, the cover plate covers the cavities to seal the cavities, ten tuning screws are mounted on the cover plate, the total number of the dielectric resonators is ten, namely a first dielectric resonator R1, a second dielectric resonator R2, … and a tenth dielectric resonator R10, and the ten dielectric resonators are sequentially mounted in the first cavity, the second cavity, … and the tenth cavity;
further comprising: two cross bar screw coupling mechanisms; one of which is located between the ninth dielectric resonator R9 and the tenth dielectric resonator R10 or between the first dielectric resonator R1 and the second dielectric resonator R2; another cross bar screw coupling mechanism is located between the third dielectric resonator R3 and the fourth dielectric resonator R4, between the fourth dielectric resonator R4 and the fifth dielectric resonator R5, between the fifth dielectric resonator R5 and the sixth dielectric resonator R6, between the sixth dielectric resonator R6 and the seventh dielectric resonator R7, or between the seventh dielectric resonator R7 and the eighth dielectric resonator R8.
The dielectric resonator comprises a dielectric block, a supporting block and a threaded section, the supporting block is arranged between the dielectric block and the threaded section, the dielectric block and the threaded section are bonded with each other by glue, and the threaded section is arranged in a threaded through hole at the bottom of the cylindrical cavity.
The supporting block is of a quartz tubular structure.
The cross rod screw coupling mechanism comprises a coupling window and a cross rod screw, the cross rod screw comprises a coupling section and an installation section, threads are arranged on the installation section and matched with a threaded hole formed in the side wall of the cavity, the coupling section is a cylinder with a smooth surface and extends into the cavity, the coupling window of the cross rod screw coupling mechanism is arranged between adjacent cylindrical cavities, and the depth of the coupling window is four fifths of the depth of the cylindrical cavities.
The diameter of the mounting section is larger than that of the coupling section, and the distance from the head of the coupling section to the inner wall of the cavity is not less than 1 mm.
The SMA electrical connector comprises a first SMA electrical connector and a second SMA electrical connector, wherein the first SMA electrical connector is connected with the first cavity, and the second SMA electrical connector is connected with the tenth cavity.
The radio frequency RF signal is input from the first SMA electrical connector, sequentially passes through a first dielectric resonator R1, a second dielectric resonator R2, a third dielectric resonator R3, a fourth dielectric resonator R4, a fifth dielectric resonator R5, a sixth dielectric resonator R6, a seventh dielectric resonator R7, an eighth dielectric resonator R8, a ninth dielectric resonator R9 and a tenth dielectric resonator R10 of the resonators, and is finally output from the second SMA electrical connector.
The dielectric filter has two cross couplings, namely the coupling between the second dielectric resonator R2 and the ninth dielectric resonator R9 and the coupling between the third dielectric resonator R3 and the eighth dielectric resonator R8, wherein the two cross couplings are both realized through coupling holes and are both positive couplings.
The dielectric filter comprises nine main couplings, namely coupling between dielectric resonators R1 and R2, coupling between R2 and R3, coupling between R3 and R4, coupling between R4 and R5, coupling between R5 and R6, coupling between R6 and R7, coupling between R7 and R8, coupling between R8 and R9, and coupling between R9 and R10; the horizontal rod screw coupling mechanisms are all negative couplings, and the rest main couplings are all positive couplings and are realized through coupling holes.
The length of the coupling hole is not less than 2 mm.
Compared with the prior art, the invention has the beneficial effects that:
(1) in the invention, the cross negative coupling in a probe form is not adopted, two special cross rod screw coupling mechanisms are designed on the main coupling, the coupling mechanism can continuously adjust the coupling amount, the cover does not need to be repeatedly detached during debugging, the debugging amount can be greatly reduced, and the processing difficulty is reduced by integrally processing the cavity by adopting a common milling cutter during processing. The two coupling mechanisms are flexibly placed; one of which is located between the ninth dielectric resonator R9 and the tenth dielectric resonator R10 or between the first dielectric resonator R1 and the second dielectric resonator R2; the other coupling mechanism 6 is located between the third dielectric resonator R3 and the fourth dielectric resonator R4, between the fourth dielectric resonator R4 and the fifth dielectric resonator R5, between the fifth dielectric resonator R5 and the sixth dielectric resonator R6, between the sixth dielectric resonator R6 and the seventh dielectric resonator R7, or between the seventh dielectric resonator R7 and the eighth dielectric resonator R8.
(2) The parasitic coupling of the present invention is very small. Because all cross coupling is realized by the coupling holes, compared with the traditional U-shaped probe for realizing cross coupling, parasitic coupling introduced by the coupling holes is very small, and redundant cross coupling is not needed to overcome the influence of the parasitic coupling. Therefore, the structure is compact and the debugging is simple.
(3) The negative coupling structure is simple. The negative coupling of the dielectric filter in the related literature is cross coupling, the negative coupling amount is very small, and the negative coupling amount is usually realized by adopting a U-shaped probe, and the U-shaped probe has the defects of complicated shape making, sensitivity to length and difficulty in accurate calculation. The negative coupling structure is realized by the cross rod screw coupling mechanism, the cross rod screw coupling mechanism is directly processed without molding, and the negative coupling structure can also adjust the coupling amount in a micro-scale manner through the tuning screw, so that the debugging amount is reduced, and the reliability of the product is improved.
(4) In the filter in the prior art, the distance between the coupling rod and the inner wall of the cavity is very small, the filter is influenced by factors such as thermal expansion and cold contraction, the reliability and the stability of the whole filter are insufficient, the structure of the filter has no tiny space, and the reliability of a product is improved.
(5) The thickness of the coupling hole 7 is shortened, and the minimum thickness (length) is 2mm, so that the relative design bandwidth of the filter is widened, the width is twice as wide as that of the filter in the prior art, the width reaches 1%, and the application range of the product is improved.
Drawings
Fig. 1 is an outline diagram of a TE01 mode dielectric filter easy to machine and debug according to the present invention;
fig. 2 is an internal specific structure of a TE01 mode dielectric filter easy to machine and debug according to the present invention;
FIG. 3 is a dielectric resonator composition;
FIG. 4 is a detailed block diagram of the cross bar screw coupling mechanism of the present invention;
FIG. 5 is a detailed block diagram of the screws of the cross bar screw coupling mechanism of the present invention;
FIG. 6 is a cross-sectional view of a coupling window of the crossbar screw coupling mechanism of the present invention;
FIG. 7 is a cross-sectional view of a U-shaped coupling hole of the prior Chinese patent ZL 201110181357.0;
FIG. 8 is a cross-sectional view of a T-shaped coupling rod coupling structure in the prior Chinese patent ZL 201110181357.0;
FIG. 9 is a cross-sectional view of a cross-bar coupling screw arrangement of the present invention;
fig. 10 is a schematic diagram of a structure of a TE01 mode ten-order self-equalizing dielectric filter given in prior international patent WO 95/27317;
fig. 11 is a structural schematic diagram of a TE01 mode ten-order self-equalizing dielectric filter disclosed in the prior chinese patent ZL 201110181357.0;
fig. 12 is a schematic structural diagram of a TE01 mode dielectric filter disclosed in the prior chinese patent CN 104218281B;
FIG. 13 is a measured amplitude-frequency curve of the TE01 mode dielectric filter of the present invention;
fig. 14 is a measured delay curve of the TE01 mode dielectric filter of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
In the design of a dielectric filter, a technology for overcoming parasitic coupling is very critical, and the so-called parasitic coupling overcoming technology is a technology for eliminating the influence of the parasitic coupling on the transmission response of the filter. Parasitic coupling is commonly existing in filters in structural forms such as coaxial filters, dielectric filters and the like, and is unwanted redundant coupling generated due to the topological structure and the physical structural form of the filter, if the coupling is large, the transmission response of the filter is affected, so that the transmission response which should be symmetrical is asymmetric, or an unwanted out-of-band suppression pole appears, and a method must be adopted to eliminate the influence of the parasitic coupling on the transmission response. Fig. 10 is a schematic diagram of a structure of a conventional international patent WO 95/27317 TE01 modulo ten order self-equalizing dielectric filter, which overcomes the effect of parasitic coupling by introducing redundant cross-coupling. The defects are that the structure of the product is complex and the reliability is reduced due to the introduction of redundant cross coupling. Fig. 11 is a structural diagram of a model ZL201110181357.0TE01 ten-order self-equalizing dielectric filter, which overcomes the influence of parasitic coupling by introducing a double-layer negative coupling probe, and has the disadvantages of complicated shape of the double-layer negative coupling probe, sensitivity to length, difficulty in calculation accuracy, need to repeatedly open a cover plate to modify the length of the probe, and complicated debugging. As shown in fig. 12, a T-shaped coupling rod is used in the domestic patent CN104218281B, but when the coupling amount difference is large, the cover plate needs to be detached to replace the backup T-shaped coupling rod, and the coupling hole of the T-shaped coupling rod needs to be processed by electric spark, so that the processing is slow and the process is complex. The mounting positions of two T-shaped coupling rods are fixed, wherein one is mounted between R1 and R2, and the other is mounted between R6 and R7.
According to the TE01 mode dielectric filter easy to process and debug, the TE01 mode is a resonance mode in a dielectric resonator and is a ten-order self-balancing Ku frequency band dielectric filter, a transmission function adopts a 10-4-4 form, namely the filter is provided with 8 transmission zeros, 4 of the transmission zeros are used for time delay balancing, and 4 of the transmission zeros are used as out-of-band suppression poles.
As shown in fig. 1 and 2, the ten-order self-balanced Ku-band dielectric filter provided by the invention comprises a cavity 1, a cover plate 2, an SMA electrical connector 3, a tuning screw 4, a dielectric resonator 5 and a cross rod screw coupling mechanism 6;
the SMA electric connector 3 is arranged on one side of the cavity 1, ten cylindrical cavities are arranged in the cavity 1, the cylindrical cavities are arranged in two rows side by side, and the cylindrical cavities in the same row are communicated through a coupling hole 7 or a cross rod coupling mechanism 6 to realize main coupling among 10 dielectric resonators 5.
The first row of cylindrical cavities are numbered as a first cavity, a second cavity, … and a fifth cavity in sequence, wherein the first cavity is close to the SMA electrical connector 3, and the SMA electrical connector 3 extends into the first cavity; the second row of cylindrical cavities are numbered as a tenth cavity, a ninth cavity and an … sixth cavity in sequence, wherein the tenth cavity is close to the SMA electrical connector 3, and the SMA electrical connector 3 extends into the tenth cavity; coupling holes 7 are formed between the second cavity and the ninth cavity, between the third cavity and the eighth cavity, and between the fifth cavity and the sixth cavity;
the SMA electrical connector 3 comprises a first SMA electrical connector and a second SMA electrical connector, wherein the first SMA electrical connector is connected with the first cavity, and the second SMA electrical connector is connected with the tenth cavity.
The filter adopts a folded topological structure, the topological structure can realize N-2 transmission zeros, N is the order of the filter and can meet the design requirement, the dielectric resonators 5 are ten in total and respectively comprise a first dielectric resonator R1, a second dielectric resonator R2, … and a tenth dielectric resonator R10, and the ten dielectric resonators are sequentially arranged in the first cavity, the second cavity, … and the tenth cavity;
as shown in fig. 3, the dielectric resonator 5 includes a dielectric block 9, a supporting block 10 and a threaded section 11, the supporting block 10 is arranged between the dielectric block 9 and the threaded section 11, and the two are bonded by glue, and the threaded section 11 is installed in a threaded through hole at the bottom of the cylindrical cavity. The support block 10 is a quartz tubular structure.
As shown in fig. 2 and 4, the crossbar screw coupling mechanisms 6 have two in total, one of which is located between the ninth dielectric resonator R9 and the tenth dielectric resonator R10 or between the first dielectric resonator R1 and the second dielectric resonator R2; another cross-bar screw coupling mechanism 6 is located between the third dielectric resonator R3 and the fourth dielectric resonator R4, between the fourth dielectric resonator R4 and the fifth dielectric resonator R5, between the fifth dielectric resonator R5 and the sixth dielectric resonator R6, between the sixth dielectric resonator R6 and the seventh dielectric resonator R7, or between the seventh dielectric resonator R7 and the eighth dielectric resonator R8.
The two T-shaped coupling rods used in the domestic patent CN104218281B are fixed in position, the first is fixed between R1 and R10, and the second is fixed between R6 and R7. The position of the cross bar coupling mechanism can be placed at different positions according to specific design, so that the design is more flexible.
The cover plate 2 covers the cavity 1 to seal the cavity 1, ten tuning screws 4 are all installed on the cover plate 2, and one ends of the tuning screws 4 extend into the cavity 1 and are opposite to the dielectric resonator 5.
The radio frequency RF signal is input from the first SMA electrical connector, sequentially passes through the first dielectric resonator R1, the second dielectric resonator R2, the third dielectric resonator R3, the fourth dielectric resonator R4, the fifth dielectric resonator R5, the sixth dielectric resonator R6, the seventh dielectric resonator R7, the eighth dielectric resonator R8, the ninth dielectric resonator R9, and the tenth dielectric resonator R10 of the resonator 5, and is finally output from the second SMA electrical connector.
The input and output of the dielectric filter are coupled by a probe. The dielectric filter further has two cross couplings, namely, the coupling between the second dielectric resonator R2 and the ninth dielectric resonator R9, and the coupling between the third dielectric resonator R3 and the eighth dielectric resonator R8, which are respectively denoted by M29 and M38, wherein the two cross couplings are both positive couplings and are realized through the coupling hole 7. The thickness of the coupling hole 7 is shortened, and the minimum thickness (length) is 2mm, so that the relative design bandwidth of the filter is widened, the width is twice as wide as that of the filter in the prior art, the width reaches 1%, and the application range of the product is improved.
The dielectric filter comprises nine main couplings, namely coupling between dielectric resonators R1 and R2, coupling between R2 and R3, coupling between R3 and R4, coupling between R4 and R5, coupling between R5 and R6, coupling between R6 and R7, coupling between R7 and R8, coupling between R8 and R9, and coupling between R9 and R10, which are respectively represented by M12, M23, M34, M45, M56, M67, M78, M89 and M910, wherein negative coupling is realized by a cross-bar screw coupling mechanism 6, and positive coupling is realized by a coupling hole 7. The embodiment shown in the figure is that the couplings M45 between R4 and R5 and the couplings M910 between R9 and R10 are all negative couplings, the coupling amount is relatively large, and the negative couplings are achieved by the cross-bar screw coupling mechanism 6, but according to the design of the invention, the cross-bar screw coupling mechanism 6 can also be designed at other positions, and the couplings at the positions of the cross-bar screw coupling mechanism 6 are all negative couplings.
As shown in fig. 4, the rail screw coupling mechanism 6 includes two parts, a coupling window and a rail screw. The cross rod screw is shown in fig. 5 and comprises a coupling section and a mounting section, wherein the mounting section is provided with threads and matched with threaded holes formed in the side wall of the cavity 1, the coupling section is a cylinder with a smooth surface and extends into the cavity 1, and a coupling window of the cross rod screw coupling mechanism 6 is arranged between adjacent cylindrical cavities.
As shown in figure 2, the coupling window of the cross bar screw coupling mechanism 6 is different from the coupling hole 7, the coupling hole 7 is arranged at the position close to the center of two cylindrical cavities, the coupling window is arranged at the eccentric position close to the two cylindrical cavities, one side of the coupling window is flush with the outer side of the cavity 1, and the other side of the coupling window is tangent to the arc position of the cylindrical cavity. The depth of the coupling window is four fifths of the depth of the cylindrical cavity, and the coupling window can be directly processed by a milling cutter.
As shown in figure 6, compared with the coupling window of the cross bar screw coupling mechanism 6 adopting the domestic patent CN104218281B, as shown in figure 7, the U-shaped hole design is adopted, as shown in figure 8, a T-shaped coupling rod is arranged in the U-shaped hole, the U-shaped hole processing needs to use an electric spark process, the processing is complex, the time is long, and the processing process is simplified by the invention.
As shown in fig. 9, the diameter of the mounting section of the crossbar screw is larger than that of the coupling section, and the distance (gap 13) from the head of the coupling section to the side wall of the coupling hole in the cavity 1 is not less than 1 mm. As shown in fig. 8, the distance (gap 12) between the two T-shaped coupling rods used in the domestic patent CN104218281B and the side wall is not more than 0.5mm, and a small distance exists, so that the distance of the product under the high and low temperature test conditions can be further reduced, short circuit is easily caused, and reliability is reduced.
The cross rod screw coupling mechanism 6 can continuously adjust the coupling amount without detaching a cover plate. The holes of the cross bar and screw coupling mechanism are common through holes, and electric spark process machining is not needed. The cross rod screw coupling mechanism has no small gap size, short circuit is avoided, and product reliability is improved.
In the embodiment of the present invention, all positive couplings of the filter are realized by the coupling holes 7. The main coupling has two negative couplings, namely the coupling M45 between the dielectric resonators R4 and R5 and the coupling M910 between the dielectric resonators R9 and R10, and simulation analysis shows that the parasitic coupling of the structural filter is very small and is not enough to change the symmetry of the transmission curve of the filter, so that no measures need to be taken to overcome the influence of the parasitic coupling.
The field of the TE01 mode dielectric filter is concentrated inside the dielectric block, the adjustment amount of the tuning screw 4 is very small, therefore, the integral simulation needs to be carried out, the influence of non-adjacent dielectric resonators on the coupling amount is considered, and the invention adopts the collaborative simulation technology to carry out the integral simulation on the tenth-order TE01 mode dielectric filter. The collaborative simulation technology is designed by utilizing electromagnetic calculation software and circuit calculation software together, so that the design efficiency is improved, the problems of time consumption and low efficiency of full-field simulation of a high-order dielectric filter are solved, and meanwhile, the parasitic coupling between resonators is considered.
Finally, the performance parameters and indexes which can be achieved by the invention are shown in the following table, the frequency of the product is 12GHz, and the amplitude-frequency and time delay normal-temperature actual measurement curve is shown in a graph 13 and a graph 14.
TABLE 1
At normal temperature, the fluctuation of the filter at +/-57.5 MHz is 0.6dB, and the inhibition at +/-69 MHz is 23 dB. The time delay at + -57.5 MHz is 20 ns. The dielectric filter provided by the invention has excellent performance.
Claims (7)
1. A TE01 mode dielectric filter easy to machine and debug comprises a cavity (1), a cover plate (2), an SMA (SMA) electric connector (3), tuning screws (4) and a dielectric resonator (5), wherein the SMA electric connector (3) is arranged on one side of the cavity (1), ten cylindrical cavities are arranged in the cavity (1), the cylindrical cavities are arranged in two rows side by side, and the cylindrical cavities in the same row are communicated through a coupling hole (7); the first row of cylindrical cavities are sequentially numbered as a first cavity, a second cavity, … and a fifth cavity, wherein the first cavity is close to the SMA electrical connector (3) and the SMA electrical connector (3) extends into the first cavity; the second row of cylindrical cavities are numbered as a tenth cavity, a ninth cavity and an … sixth cavity in sequence, wherein the tenth cavity is close to the SMA electrical connector (3) and the SMA electrical connector (3) extends into the tenth cavity; coupling holes (7) are formed between the second cavity and the ninth cavity, between the third cavity and the eighth cavity, and between the fifth cavity and the sixth cavity, a cover plate (2) covers the cavity (1) to seal the cavity (1), ten tuning screws (4) are mounted on the cover plate (2), ten dielectric resonators (5) are respectively a first dielectric resonator R1, a second dielectric resonator R2, a … and a tenth dielectric resonator R10, and the ten dielectric resonators are sequentially mounted in the first cavity, the second cavity, the … and the tenth cavity;
it is characterized by also comprising: two cross bar screw coupling mechanisms (6); one of which is located between the ninth dielectric resonator R9 and the tenth dielectric resonator R10 or between the first dielectric resonator R1 and the second dielectric resonator R2; another cross rod screw coupling mechanism (6) is positioned between the third dielectric resonator R3 and the fourth dielectric resonator R4, between the fourth dielectric resonator R4 and the fifth dielectric resonator R5, between the fifth dielectric resonator R5 and the sixth dielectric resonator R6, between the sixth dielectric resonator R6 and the seventh dielectric resonator R7 or between the seventh dielectric resonator R7 and the eighth dielectric resonator R8;
the cross bar screw coupling mechanism (6) comprises a coupling window and a cross bar screw, the cross bar screw comprises a coupling section and an installation section, the installation section is provided with threads and matched with a threaded hole formed in the side wall of the cavity (1), the coupling section is a cylinder with a smooth surface and extends into the cavity (1), the coupling window of the cross bar screw coupling mechanism (6) is arranged between adjacent cylindrical cavities, and the depth of the coupling window is four fifths of the depth of the cylindrical cavities;
the diameter of the mounting section is larger than that of the coupling section, and the distance from the head of the coupling section to the inner wall of the cavity (1) is not less than 1 mm;
the SMA electrical connector (3) comprises a first SMA electrical connector and a second SMA electrical connector, wherein the first SMA electrical connector is connected with the first cavity, and the second SMA electrical connector is connected with the tenth cavity.
2. The easy-to-machine-debug TE01 mode dielectric filter according to claim 1, wherein: the dielectric resonator (5) comprises a dielectric block (9), a supporting block (10) and a threaded section (11), the supporting block (10) is arranged between the dielectric block (9) and the threaded section (11), the dielectric block (9) and the threaded section (11) are bonded with each other through glue, and the threaded section (11) is arranged in a threaded through hole at the bottom of the cylindrical cavity.
3. The easy-to-machine-debug TE01 mode dielectric filter according to claim 2, wherein: the supporting block (10) is of a quartz tubular structure.
4. The easy-to-machine-debug TE01 mode dielectric filter according to claim 1, wherein: the radio frequency RF signal is input from the first SMA electrical connector, sequentially passes through a first dielectric resonator R1, a second dielectric resonator R2, a third dielectric resonator R3, a fourth dielectric resonator R4, a fifth dielectric resonator R5, a sixth dielectric resonator R6, a seventh dielectric resonator R7, an eighth dielectric resonator R8, a ninth dielectric resonator R9 and a tenth dielectric resonator R10 of the dielectric resonator (5), and is finally output from the second SMA electrical connector.
5. The TE01 mode dielectric filter easy to machine and debug as claimed in any one of claims 1-4, wherein: the dielectric filter has two cross couplings, namely the coupling between the second dielectric resonator R2 and the ninth dielectric resonator R9 and the coupling between the third dielectric resonator R3 and the eighth dielectric resonator R8, wherein the two cross couplings are both realized through the coupling hole (7) and are both positive couplings.
6. The TE01 mode dielectric filter easy to machine and debug as claimed in any one of claims 1-4, wherein: the dielectric filter comprises nine main couplings, namely coupling between dielectric resonators R1 and R2, coupling between R2 and R3, coupling between R3 and R4, coupling between R4 and R5, coupling between R5 and R6, coupling between R6 and R7, coupling between R7 and R8, coupling between R8 and R9, and coupling between R9 and R10; the coupling mechanism (6) is used for realizing negative coupling, and the other main couplings are positive couplings and are realized through coupling holes (7).
7. The TE01 mode dielectric filter easy to machine and debug according to claim 6, wherein: the length of the coupling hole (7) is not less than 2 mm.
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| CN111384546A (en) * | 2018-12-29 | 2020-07-07 | 深圳市大富科技股份有限公司 | Dielectric filter and communication equipment |
| CN111384510A (en) * | 2018-12-31 | 2020-07-07 | 深圳市大富科技股份有限公司 | Dielectric filter, preparation method thereof and communication equipment |
| CN111446524B (en) * | 2019-01-17 | 2022-04-08 | 罗森伯格技术有限公司 | Single-layer cross coupling filter |
| CN109904572A (en) * | 2019-01-30 | 2019-06-18 | 苏州市协诚五金制品有限公司 | It is a kind of to realize the structure coupled between media ceramic resonator |
| CN113410603B (en) * | 2021-06-16 | 2022-08-02 | 聪微科技(深圳)有限公司 | Microwave filter and manufacturing method thereof |
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| CN201829595U (en) * | 2010-10-27 | 2011-05-11 | 西安空间无线电技术研究所 | Coupling structure for screw filter |
| CN103441317B (en) * | 2013-09-05 | 2015-07-15 | 宁波泰立电子科技有限公司 | Cavity filter with rotation adjustable loop |
| CN104319433A (en) * | 2014-10-13 | 2015-01-28 | 世达普(苏州)通信设备有限公司 | Waveguide duplexer with positive and negative convertible cross coupling |
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| CN201138682Y (en) * | 2007-09-04 | 2008-10-22 | 深圳市配天网络技术有限公司 | Tuning screw nail for microwave coaxial cavity filter |
| CN201478421U (en) * | 2009-06-23 | 2010-05-19 | 安徽华夏微波电子股份有限公司 | Ultra wideband four-band combiner |
| CN202839919U (en) * | 2012-09-13 | 2013-03-27 | 深圳市大富科技股份有限公司 | Cavity filter, tuning screw and self-locking screw |
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| CN108281741A (en) | 2018-07-13 |
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