CN103956543A - Dielectric filter with low-pressure high-power threshold value - Google Patents
Dielectric filter with low-pressure high-power threshold value Download PDFInfo
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- CN103956543A CN103956543A CN201410216005.8A CN201410216005A CN103956543A CN 103956543 A CN103956543 A CN 103956543A CN 201410216005 A CN201410216005 A CN 201410216005A CN 103956543 A CN103956543 A CN 103956543A
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Abstract
A dielectric filter with a low-pressure high-power threshold value comprises a filter cavity, an upper cover board, a pressing force adjusting screw, a metal pressing block, a thin cover board, a dielectric resonator, a frequency tuning screw, a locating dielectric block, a welding rod, a connector and a fastening screw. The adjusting structure of the pressing force adjusting screw, the upper cover board, the metal pressing block and the thin cover board is designed, the dielectric resonator is placed between a cavity limiting pit and the thin cover board, the dielectric resonator, the thin cover board and the cavity make good contact in different temperature, mechanics and vacuum environments through adjustment of a pressure tuning screw, and it is guaranteed that the working performance of the TM01 mode dielectric filter is reliable and stable in different environments. The mode that the locating dielectric block and a dielectric tuning screw are combined is adopted, an electromagnetic field in the dielectric resonator is slightly disturbed, and compared with a tuning screw made of metal, the low-pressure power threshold value of the filter is obviously increased.
Description
Technical field
The present invention relates to the dielectric filter of the high-power threshold value of a kind of low pressure, belong to ground and satellite communication microwave components design field.
Background technology
China's applied satellite technology develop rapidly: on the one hand, in order to improve communications performance, require the operating power of Satellite-borne microwave equipment more and more higher; On the other hand, for improving integrated level, require the volume weight of Satellite-borne microwave equipment more and more less.Two aspects cause occurring inhomogeneous and high-intensity electric field in Satellite-borne microwave equipment, will cause discharge effect.Coaxial filter is widely used in satellite forwarding, observing and controlling and remote sensing system, in order to obtain more high-power threshold value, must increase volume weight.
In meteorological satellite, observing and controlling and tracking system, microwave component is all in running order from being transmitted into the overall process of entering the orbit, traditional coaxial filter is due to electric field distribution characteristic, its low pressure power threshold can not meet the demand of model, has that volume is little, lightweight, Q value is high and the research filter that low pressure power threshold is high is extremely urgent for this reason.
The particularity of the distribution of electromagnetic field of TM01 mould dielectric filter makes its low pressure power threshold much larger than coaxial configuration filter.But domestic and international existing dielectric filter structure cannot meet reliability and the completeness of spaceborne filter requirement completely, such as cover plate distressed structure (Fig. 1) and double-layer cover plate structure (Fig. 2) can not meet the demand under different mechanics, temperature environment and vacuum condition: the former is because stress is in the tired resistance test of satellite, the deformation of thin cover plate finally can not recover, and causes performance of filter to lose efficacy; The stress that the latter produces in mechanical shock vibration test can not discharge fast, causes performance of filter to change.In addition, traditional dielectric filter adopts limiting stand or metal frequency adjustment bolt structure form, too large to electromagnetic disturbance in dielectric resonator cavity, and the power threshold of dielectric filter is reduced rapidly.
Summary of the invention
The technical problem that the present invention solves is: overcome the deficiencies in the prior art, the dielectric filter of the high-power threshold value of a kind of low pressure is proposed, by the limiting value producing according to environmental stress, provide default deformation, obtain corresponding moment, by the pressure regulating mechanism that cover plate-thrust adjustment screw-metallic briquette-thin cover plate forms, thrust is evenly distributed on thin cover plate, in varying environment, hole by thin cover plate goes out Stress Release, fatigue strength and the life-span of dielectric filter have effectively been increased, adopt location medium block and the dielectric tuning screw method of combining to improve the low pressure power threshold of filter simultaneously, meet satellite instructions for use.
Technical solution of the present invention is:
The dielectric filter of the high-power threshold value of a kind of low pressure comprises: pressure regulating mechanism, cavity, dielectric resonator, frequency tuning screw, location medium block, welding bars, joint, trip bolt; Pressure regulating mechanism comprises again upper cover plate, thrust adjustment screw, metallic briquette, thin cover plate;
There is counterbore the bottom surface of upper cover plate, metallic briquette is positioned under the counterbore of upper cover plate, metallic briquette and upper cover plate are positioned at the upper surface of thin cover plate, the middle position that one end of thrust adjustment screw withstands on metallic briquette through upper cover plate is evenly distributed on thin cover plate pressure, and then dielectric resonator is contacted with thin cover plate with cavity well under varying environment;
Thin cover plate is closely connected with the top of cavity by trip bolt; Dielectric resonator is between cavity and thin cover plate, and the centre of thin cover plate respective chamber has circular hole, and the Circularhole diameter of thin cover plate is greater than the internal diameter of dielectric resonator, is less than the external diameter of dielectric resonator; Medium block lower end, location is positioned at dielectric resonator, and upper end is arranged in the circular hole of thin cover plate, and for preventing dielectric resonator, it is subject to the impact of tangential force to cause skew; Frequency tuning screw stretches into dielectric resonator through cavity bottom surface and realizes frequency tuning for perturbation dielectric resonator built-in field.
Described upper cover plate bottom surface counterbore is circular, and described metal derby is loop configuration, and the height of upper cover plate bottom surface counterbore is greater than metallic briquette height, and diameter matches with metallic briquette diameter.
The supercharging groove diameter of described metallic briquette bottom is greater than the external diameter of dielectric resonator.
Described thin cover plate is planar structure, and material is beryllium-bronze.
Described frequency tuning screw material is polyimides, aluminium nitride.
After described medium block lower end, location is arranged in dielectric resonator and upper end is arranged in the circular hole of thin cover plate, by heat-conducting glue, be connected with thin cover plate.
The present invention's beneficial effect is compared with prior art:
(1) in structure of the present invention, adopt the pressure regulating mechanism that cover plate-thrust adjustment screw-metallic briquette-thin cover plate forms, can calculate cavity, dielectric resonator and the ultimate deformation of cover plate different materials under operational environment, compress in advance the corresponding moment of adjustment screw largest deformation, guarantee that thin cover plate deformation fatigue can not occur under institute's operational environment, can there is not the irreclaimable situation of thin cover plate deformation, the power that can make to be applied on metallic briquette is evenly distributed on thin cover plate simultaneously, guarantee that thin cover plate effectively contacts under varying environment with dielectric resonator.
(2) filter cavity of the present invention adopts the design that location medium block and dielectric tuning screw match, and reduces the disturbance to the electromagnetic field in dielectric resonator mesopore, can effectively improve the low pressure power threshold of filter.The version that adopts limiting stand and metallic screw, can make metallic screw enter the position, hole in dielectric resonator, disturbance inner field intensity, cause field intensity and magnitude of voltage to increase rapidly, reduced the power threshold of dielectric filter.Adopt location medium block and dielectric tuning screw can effectively reduce maximum field value and the magnitude of voltage in air, increase power threshold, can meet the demand of meteorological satellite and tracking and TT&C system.
(3) thin cover plate of the present invention adopts the design of perforate above corresponding dielectric resonator, in mechanics vibrations, impact and temperature cycles, make in mechanics deformational stress in impulsive force and temperature cycles discharge, effectively increased endurance and the useful life of thin cover plate.
(4) the present invention adopts pressure regulating mechanism, by regulating thrust adjustment screw that the present invention can effectively be worked under different operational environments, with respect to traditional mechanism, according to environmental change, redesign, applicability of the present invention is stronger, greatly provide cost savings, guaranteed the uniformity of design.
(5) the critical component cavity in the present invention, cover plate, metallic briquette are aluminum, thrust adjustment screw be invar material, thin cover plate is flat beryllium-bronze material, dielectric resonator is ceramic material, location medium block is soluble polyimide, and frequency tuning screw is polyimides, aluminium nitride material, and the present invention is by Stress calculation and analyze the material of choosing critical component, increase endurance and the useful life of whole filter, greatly improved operating efficiency.
Accompanying drawing explanation
Fig. 1 is the dielectric resonator structural representation of conventional cover plate distressed structure;
Fig. 2 is the structural representation of the dielectric resonator of traditional double-deck covering plate structure;
Fig. 3 is dielectric resonator structural representation of the present invention;
Fig. 4 is the overall structure schematic diagram that two dielectric resonators of the present invention are coupled connected;
Fig. 5 is the upper cover plate schematic diagram of dielectric filter of the present invention;
Fig. 6 is the thin cover plate schematic diagram of the metallic briquette of dielectric filter of the present invention;
Fig. 7 is the thin cover plate schematic diagram of dielectric filter of the present invention;
Fig. 8 is the simulation model of dielectric filter of the present invention;
Fig. 9 is the transmission characteristic of dielectric filter of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described in detail.
As shown in Figure 3, the dielectric filter of the high-power threshold value of a kind of low pressure of the present invention, comprising: pressure regulating mechanism, cavity 1, dielectric resonator 6, frequency tuning screw 7, location medium block 8, welding bars 9, joint 10, trip bolt 11; Pressure regulating mechanism comprises again upper cover plate 2, thrust adjustment screw 3, metallic briquette 4, thin cover plate 5;
There is counterbore the bottom surface of upper cover plate 2, metallic briquette 4 is positioned under the counterbore of upper cover plate 2, metallic briquette 4 and upper cover plate 2 are positioned at the upper surface of thin cover plate 5, the middle position that one end of thrust adjustment screw 3 withstands on metallic briquette 4 through upper cover plate 2 is evenly distributed on thin cover plate 5 pressure, and then dielectric resonator 6 and cavity 1 and thin cover plate 5 are contacted well under varying environment; As shown in Figure 5,6, upper cover plate 2 bottom surface counterbores are circular, and described metal derby 4 is loop configuration, and the height of upper cover plate 2 bottom surface counterbores is greater than metallic briquette 4 height, and diameter matches with metallic briquette 4 diameters; Metallic briquette 4 bottoms have supercharging groove, and supercharging groove diameter is greater than the external diameter of dielectric resonator 6.
Thin cover plate 5 is closely connected with the top of cavity 1 by trip bolt 11; Dielectric resonator 6 is between cavity 1 and thin cover plate 5, and the centre of thin cover plate 5 respective chamber 1 has circular hole; Thin cover plate 5 compresses dielectric resonator 6, absorbs mechanics impulsive force and temperature cycles and changes the stress producing, and the Circularhole diameter of thin cover plate 5 is greater than the internal diameter of dielectric resonator 6, is less than the external diameter of dielectric resonator 6; Medium block 8 lower ends, location are positioned at dielectric resonator 6, and for preventing dielectric resonator 6, it is subject to the impact of tangential force to cause skew to the circular hole that upper end is arranged in thin cover plate 5; Frequency tuning screw 7 stretches into dielectric resonator 6 through cavity 1 bottom surface and realizes frequency tuning for perturbation dielectric resonator 6 built-in fields.
6, the dielectric filter of the high-power threshold value of a kind of low pressure according to claim 1, it is characterized in that: after described location medium block 8 lower ends are arranged in dielectric resonator 6 and upper end is arranged in the circular hole of thin cover plate 5, by heat-conducting glue, be connected with thin cover plate 5.
The present invention can also link together the filter that forms a multi-resmator by a plurality of dielectric resonators, is illustrated in figure 4 the filter of two dielectric resonators; Filter signal enters from input adapter 9, by input welding bars, is coupled to first resonator, then by coupling window, enters second resonator, and four resonators of in like manner to the are finally coupled to output welding bars from out splice going splice output signal.
The frequency of filter mainly determines by dielectric resonator 6, and 7 pairs of filters of frequency tuning screw are finely tuned.By dielectric resonator 6 is carried out to individual cell frequency test screen, determine the resonance frequency of resonator, select suitable dielectric resonator 6, be placed on the limited pit at cavity 1 center, under thin cover plate 5.The Center limited location hole of cavity 1, the external diameter of the diameter of limited pit and TM mould dielectric resonator 6 matches (both equate).
Frequency tuning screw 7 enters in dielectric resonator 6 by cavity 1 bottom surface, to the resonance frequency of filter, carries out tuning.The material of frequency tuning screw 7 is medium.Low pressure discharge is gas discharge, and power threshold is main relevant with electric field, voltage and energy storage in cavity.When metallic screw 7 or metal spacing platform enter in the hole of dielectric resonator 6, electric field in airport and medium internal electric field size become 3:1(table 1 from 1:1) or larger, strong disturbance Electric Field Distribution wherein, and builtin voltage is increased, reduced the low pressure power threshold of filter.
The low pressure power threshold contrast table of table 1 the present invention and traditional sucrose filter, traditional coaxial filter
As can be seen from Table 1, under same frequency, the present invention not only volume greatly reduces, and power threshold obviously improves, and differs 2-10 doubly with traditional form, has the raising of matter on power threshold improves.
Select cavity 1, thin cover plate 5 and the suitable material of dielectric resonator 6, as shown in Figure 8, calculate cavity 1, dielectric resonator 6 and the largest deformation of thin cover plate 5 under required mechanics and temperature environment, then carry out mechanical analysis, give the corresponding moment of thrust adjustment screw 3, by metallic briquette 4, exert all one's strength and be evenly distributed on thin cover plate 5.The supercharging groove diameter of metallic briquette 4 is greater than the external diameter of dielectric resonator 6, can not cause because stress is excessive TM mould dielectric resonator 6 to crush, and thin cover plate 5 under varying environment with the close contact of dielectric resonator 6, guaranteed filter reliability and stability under varying environment.
The material of cavity 1, cover plate 2, metallic briquette 4 is aluminium, the material of thrust adjustment screw 3 is invar, as shown in Figure 7, the thin cover plate 5 of thin cover plate 5 is planar structure, material is flat beryllium-bronze, dielectric resonator 6 is ceramic material, and location medium block 8 is soluble polyimide, and frequency tuning screw 7 materials are polyimides, aluminium nitride.According to table 2, set up FEM (finite element) model and carry out stress analysis at environment-35 ℃～+ 75 ℃, simulation model as shown in Figure 8.
Table 2 dielectric filter parts mechanics parameter
Thin thickness of compressive plate is 0.4mm, Bolt Torque 2.05N*m.The thin pressing plate obtaining by above-mentioned optimum results to ceramic bar axial force is: 1390N in the time of 35 ℃, 1070N 70 ℃ time.Thin pressing plate maximum stress is: 369MPa in the time of-35 ℃, 364MPa 70 ℃ time.In this structure, the compression strength of ceramic material is 757MPa, and beryllium-bronze tensile strength is not less than 635MPa, and percentage elongation is not less than 2.5%, and beryllium-bronze yield strength is approximately 556MPa.Can find out the situation that stress causes thin cover plate 5 surrenders and dielectric resonance 6 devices to crush can not occur under environmental stress, by the contrast with conventional filter, the anti-surrender ability of thin cover plate 5 in the present invention and dielectric resonance 6 device resistance to crusing abilities, considerably beyond traditional filter, have increased endurance and useful life greatly.
Thin cover plate 5 edges are closely connected by trip bolt with cavity 1, and the stress that environmental change produces can only be absorbed by the institute of thin cover plate 5.Traditional thin cover plate is to rely on deformation to absorb stress, and in the situation that stress ratio is larger, the fatigue of thin cover plate can increase rapidly, finally causes deformation not recover.In the middle of thin cover plate 5 respective chamber that the present invention adopts, there is borehole structure, by metallic briquette 4, give thin cover plate 5 environmental stresses and produce the power that maximum shape is corresponding, make thin cover plate 5 under varying environment with the close contact of TM01 mould dielectric resonator 6, make the stress that each environmental change produces discharge by the circular hole in the middle of thin cover plate 5 simultaneously, increase the useful life of filter.
The material of welding bars 8 is brass, convenient and input and output joint welding on the one hand, and the heat conduction that is conducive on the other hand the generation of joint high-power signal is distributed.
The simulation calculation of dielectric filter of the present invention comprises the following steps:
1) according to charter index, determine the exponent number of filter, corresponding quality factor q, sets up circuit model, comprehensive coupling matrix and circuit transmission characteristic.
2) the needed resonance frequency of calculating filter: use business software HFSS, set up resonant cavity model, select the dielectric resonator of dielectric constant, by adjusting resonant cavity size resonator size, make resonator resonance at required frequency, can calculate the quality factor q of resonator simultaneously.
2) the needed coupling window size of calculating filter: the coupling amount between two chambeies equals the product of coupling coefficient and design bandwidth, that is: Coup=M
ij* BW, wherein M
ijfor corresponding coupling coefficient; BW is bandwidth.By adjusting the size of coupling window, can show that corresponding coupling measures.
3) the input and output coupling amount of calculating filter: utilize transmitting time delay method, the pass of group delay and input and output coupling amount is
m wherein
01for inputing or outputing coupling, BW is bandwidth, τ (ω
0) be group delay; Input and output have adopted magnetic coupling form, adjust the distance between joint height and welding bars and resonant rod, and the group delay of emulation is equated with the group delay calculating, and draw the input and output coupling amount of filter.
4) adopt above-mentioned result of calculation can draw simulation model initial value, by S parametric method or the above-mentioned size of Y parameter method global optimization, can obtain filter final mask and electromagnetic transmission characteristic, as shown in Figure 9, final TM01 mode filter of the present invention can meet following performance parameter and index, as shown in table 3:
Table 3 dielectric filter index of the present invention
The present invention has passed through expert evaluation, and the corresponding satellite model being applied to, and has obtained good technique effect.
Non-elaborated part of the present invention belongs to techniques well known.
Claims (7)
1. a dielectric filter for the high-power threshold value of low pressure, is characterized in that comprising: pressure regulating mechanism, cavity (1), dielectric resonator (6), frequency tuning screw (7), location medium block (8), welding bars (9), joint (10), trip bolt (11); Pressure regulating mechanism comprises again upper cover plate (2), thrust adjustment screw (3), metallic briquette (4), thin cover plate (5);
There is counterbore the bottom surface of upper cover plate (2), metallic briquette (4) is positioned under the counterbore of upper cover plate (2), metallic briquette (4) and upper cover plate (2) are positioned at the upper surface of thin cover plate (5), the middle position that one end of thrust adjustment screw (3) withstands on metallic briquette (4) through upper cover plate (2) makes pressure be evenly distributed on thin cover plate (5) above, and then dielectric resonator (6) and cavity (1) and thin cover plate (5) are contacted well under varying environment;
Thin cover plate (5) is closely connected with the top of cavity (1) by trip bolt (11); Dielectric resonator (6) is positioned between cavity (1) and thin cover plate (5), and the centre of thin cover plate (5) respective chamber (1) has circular hole, and the Circularhole diameter of thin cover plate (5) is greater than the internal diameter of dielectric resonator (6), is less than the external diameter of dielectric resonator (6); Medium block (8) lower end, location is positioned at dielectric resonator (6), and upper end is arranged in the circular hole of thin cover plate (5), and for preventing dielectric resonator (6), it is subject to the impact of tangential force to cause skew; Frequency tuning screw (7) stretches into dielectric resonator (6) through cavity (1) bottom surface and realizes frequency tuning for perturbation dielectric resonator (6) built-in field.
2. the dielectric filter of the high-power threshold value of a kind of low pressure according to claim 1, it is characterized in that: described upper cover plate (2) bottom surface counterbore is for circular, described metal derby (4) is loop configuration, the height of upper cover plate (2) bottom surface counterbore is greater than metallic briquette (4) highly, and diameter matches with metallic briquette (4) diameter.
3. the dielectric filter of the high-power threshold value of a kind of low pressure according to claim 1, is characterized in that: the supercharging groove diameter of described metallic briquette (4) bottom is greater than the external diameter of dielectric resonator (6).
4. the dielectric filter of the high-power threshold value of a kind of low pressure according to claim 1, is characterized in that: described thin cover plate (5) is planar structure, and material is beryllium-bronze.
5. the dielectric filter of the high-power threshold value of a kind of low pressure according to claim 1, is characterized in that: described frequency tuning screw (7) material is polyimides, aluminium nitride.
6. the dielectric filter of the high-power threshold value of a kind of low pressure according to claim 1, it is characterized in that: after described location medium block (8) lower end is arranged in dielectric resonator (6) and upper end is arranged in the circular hole of thin cover plate (5), by heat-conducting glue, be connected with thin cover plate (5).
7. the dielectric filter of the high-power threshold value of a kind of low pressure according to claim 1, is characterized in that: the limited location hole, center of described cavity (1), the diameter of limited pit equals the external diameter of dielectric resonator (6).
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| CN201410216005.8A CN103956543B (en) | 2014-05-21 | 2014-05-21 | The dielectric filter of the high-power threshold value of a kind of low pressure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406157A (en) * | 2015-12-22 | 2016-03-16 | 江苏贝孚德通讯科技股份有限公司 | Diaphragm type adjustable filter |
| CN107910619A (en) * | 2017-11-08 | 2018-04-13 | 东莞以利沙五金制品有限公司 | Tuning screw device and its assemble method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136620A (en) * | 2010-09-03 | 2011-07-27 | 华为技术有限公司 | Transverse magnetic mode dielectric resonator, transverse magnetic mode dielectric filter and base station |
| CN201946725U (en) * | 2010-12-27 | 2011-08-24 | 深圳市威富通讯技术有限公司 | TM01 mould dielectric filter with thin cover board |
| CN202308244U (en) * | 2011-10-31 | 2012-07-04 | 深圳市大富科技股份有限公司 | Medium filter and communication radio frequency device |
-
2014
- 2014-05-21 CN CN201410216005.8A patent/CN103956543B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136620A (en) * | 2010-09-03 | 2011-07-27 | 华为技术有限公司 | Transverse magnetic mode dielectric resonator, transverse magnetic mode dielectric filter and base station |
| CN201946725U (en) * | 2010-12-27 | 2011-08-24 | 深圳市威富通讯技术有限公司 | TM01 mould dielectric filter with thin cover board |
| CN202308244U (en) * | 2011-10-31 | 2012-07-04 | 深圳市大富科技股份有限公司 | Medium filter and communication radio frequency device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406157A (en) * | 2015-12-22 | 2016-03-16 | 江苏贝孚德通讯科技股份有限公司 | Diaphragm type adjustable filter |
| CN105406157B (en) * | 2015-12-22 | 2019-04-02 | 江苏贝孚德通讯科技股份有限公司 | A kind of diaphragm type tunable filter |
| CN107910619A (en) * | 2017-11-08 | 2018-04-13 | 东莞以利沙五金制品有限公司 | Tuning screw device and its assemble method |
| CN107910619B (en) * | 2017-11-08 | 2023-03-10 | 东莞以利沙五金制品有限公司 | Tuning screw device and assembling method thereof |
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