CN103956543B - The dielectric filter of the high-power threshold value of a kind of low pressure - Google Patents
The dielectric filter of the high-power threshold value of a kind of low pressure Download PDFInfo
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- CN103956543B CN103956543B CN201410216005.8A CN201410216005A CN103956543B CN 103956543 B CN103956543 B CN 103956543B CN 201410216005 A CN201410216005 A CN 201410216005A CN 103956543 B CN103956543 B CN 103956543B
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Abstract
A dielectric filter for the high-power threshold value of low pressure, comprises filter cavity, upper cover plate pressure, tight power adjustment screw, upper cover plate, metallic briquette, thin cover plate, dielectric resonator, frequency tuning screw, tacldng medium block, welding bars, joint, trip bolt; The present invention devises the adjustment structure of tension adjusting screw-upper cover plate-metallic briquette-thin cover plate, dielectric resonator is placed between cavity limited pit and thin cover plate, by adjustment pressure-tuned screw, make dielectric resonator, thin cover plate has good contacting with cavity under different temperatures, mechanics and vacuum environment, ensure that TM01 mould dielectric filter service behaviour reliability and stability under various circumstances; And adopting tacldng medium block and dielectric tuning screw to combine mode, the electromagnetic field in perturbation dielectric resonator, compares the tuning screw of metal material, significantly improves the low pressure power threshold of filter.
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, requires that the operating power of Satellite-borne microwave equipment is more and more higher; On the other hand, for improving integrated level, require that the volume weight of Satellite-borne microwave equipment is more and more less.Two aspects cause occurring in Satellite-borne microwave equipment the uneven and electric field of high strength will causing discharge effect.Coaxial filter is widely used in, in satellite forwarding, observing and controlling and remote sensing system, must increasing volume weight to obtain more high-power threshold value.
In meteorological satellite, observing and controlling and tracking system, microwave component is all in running order from being transmitted into 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, and the research for this reason with the filter that volume is little, lightweight, Q value is high and low pressure power threshold is high is extremely urgent.
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 specifications 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 test of satellite fatigue endurance, 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, default deformation is provided by the limiting value that environmentally stress produces, obtain corresponding moment, by the pressure regulating mechanism of cover plate-thrust adjustment screw-metallic briquette-thin cover plate composition, thrust is evenly distributed on thin cover plate, in different environments, by the hole of thin cover plate, Stress Release is gone out, effectively add fatigue strength and the life-span of dielectric filter, adopt tacldng medium block and dielectric tuning screw to combine method 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, tacldng 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, under metallic briquette is positioned at 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 makes pressure uniform be distributed on thin cover plate, and then makes dielectric resonator and cavity and thin cover plate contact well under various circumstances;
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; Tacldng medium block lower end is positioned at dielectric resonator, and the circular hole that upper end is arranged in thin cover plate causes skew for preventing its impact by tangential force of dielectric resonator; 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 and metallic briquette diameter compatible close.
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.
Described tacldng medium block lower end is arranged in dielectric resonator and upper end is arranged on after in the circular hole of thin cover plate, is connected with thin cover plate by heat-conducting glue.
The present invention's beneficial effect is compared with prior art:
(1) structure of the present invention adopts the pressure regulating mechanism of cover plate-thrust adjustment screw-metallic briquette-thin cover plate composition, cavity can be calculated, dielectric resonator and the ultimate deformation of cover plate different materials under operational environment, give in advance to compress the corresponding moment of adjustment screw largest deformation, ensure that thin cover plate, under institute's operational environment, deformation fatigue can not occur, namely the irreclaimable situation of thin cover plate deformation can not be there is, the power be applied on metallic briquette can be made to be evenly distributed on thin cover plate simultaneously, ensure that thin cover plate effectively contacts under various circumstances with dielectric resonator.
(2) filter cavity of the present invention adopts the design that tacldng medium block and dielectric tuning screw match, and reduces the disturbance to the electromagnetic field in dielectric resonator mesopore, effectively can improve the low pressure power threshold of filter.Adopt the version of limiting stand and metallic screw, metallic screw can be made to enter position, hole in dielectric resonator, the inner field intensity of disturbance, causes field intensity and magnitude of voltage to increase rapidly, reduces the power threshold of dielectric filter.Adopt tacldng medium block and dielectric tuning screw can effectively reduce maximum field value in air and magnitude of voltage, increase power threshold, meteorological satellite can be met and follow the tracks of and the demand of 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, to make in mechanics deformational stress in impulsive force and temperature cycles discharge, effectively add endurance and the useful life of thin cover plate.
(4) the present invention adopts pressure regulating mechanism, by regulating thrust adjustment screw, the present invention can be worked in different operating environments effectively, environmentally redesign is changed relative to traditional mechanism, applicability of the present invention is stronger, greatly provide cost savings, ensure that 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, tacldng 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 choosing critical component, add endurance and the useful life of whole filter, substantially increase 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 conventional double covering plate structure;
Fig. 3 is dielectric resonator structural representation of the present invention;
Fig. 4 is the overall structure schematic diagram that the present invention's two dielectric resonator couplings are 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 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, tacldng 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, under metallic briquette 4 is positioned at 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 uniform be distributed on thin cover plate 5, and then makes dielectric resonator 6 contact well under various circumstances with cavity 1 and thin cover plate 5; As shown in Figure 5,6, upper cover plate 2 bottom surface counterbore is circular, and described metal derby 4 is loop configuration, and the height of upper cover plate 2 bottom surface counterbore is greater than metallic briquette 4 height, and diameter and metallic briquette 4 diameter compatible close; Metallic briquette 4 bottom has supercharging groove, and supercharging groove diameter is greater than the external diameter of dielectric resonator 6.
Thin cover plate 5 is closely connected by the top of trip bolt 11 with cavity 1; 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, and absorption mechanics impulsive force and temperature cycles change the stress produced, 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; Tacldng medium block 8 lower end is positioned at dielectric resonator 6, and the circular hole that upper end is arranged in thin cover plate 5 causes skew for preventing its impact by tangential force of dielectric resonator 6; 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.
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: described tacldng medium block 8 lower end is arranged in dielectric resonator 6 and upper end is arranged on after in the circular hole of thin cover plate 5, is connected with thin cover plate 5 by heat-conducting glue.
The present invention can also link together the filter of a formation multi-resmator by multiple dielectric resonator, is illustrated in figure 4 the filter of two dielectric resonators; Filter signal enters from input adapter 9, is coupled to first resonator, then enters second resonator by coupling window by input welding bars, in like manner to the 4th resonator, is finally coupled to output welding bars and outputs signal from out splice going splice.
The frequency of filter determines primarily of dielectric resonator 6, and frequency tuning screw 7 pairs of filters are finely tuned.By carrying out individual cell frequency test screen to dielectric resonator 6, determining the resonance frequency of resonator, selecting 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 diameter of limited pit and the external diameter of TM mould dielectric resonator 6 match (both are equal).
Frequency tuning screw 7 enters in dielectric resonator 6 by cavity 1 bottom surface, carries out tuning to the resonance frequency of filter.The material of frequency tuning screw 7 is medium.Low pressure discharge is gas discharge, and power threshold is main relevant with the electric field in cavity, voltage and energy storage.When metallic screw 7 or metal spacing platform enter in the hole of dielectric resonator 6, electric field in airport and media interior electric field level become 3:1(table 1 from 1:1) or larger, strong disturbance Electric Field Distribution wherein, and builtin voltage is increased, reduce the low pressure power threshold of filter.
The low pressure power threshold contrast table of table 1 the present invention and traditional dielectric filter, conventional coaxial filter
As can be seen from Table 1, under same frequency, the present invention not only volume greatly reduces, and power threshold significantly 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 mechanical analysis is carried out, to the corresponding moment of thrust adjustment screw 3, exerted all one's strength by metallic briquette 4 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 crush due to the stress excessive TM of causing mould dielectric resonator 6, and thin cover plate 5 under various circumstances with the close contact of dielectric resonator 6, ensure that filter reliability and stability under various circumstances.
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 tacldng medium block 8 is soluble polyimide, and frequency tuning screw 7 material is polyimides, aluminium nitride.Set up FEM (finite element) model according to table 2 and carry out stress analysis at environment-35 DEG C ~+75 DEG C, 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 obtained by above-mentioned optimum results to ceramic bar axial force is: 1390N when 35 DEG C, 70 DEG C time 1070N.Thin pressing plate maximum stress is: 369MPa when-35 DEG C, 70 DEG C time 364MPa.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 and the situation that stress causes thin cover plate 5 to be surrendered and dielectric resonance 6 device crushes can not occur under environmental stress, by the contrast with conventional filter, thin cover plate 5 anti-surrender ability in the present invention and dielectric resonance 6 device crush resistance, considerably beyond traditional filter, considerably increase endurance and useful life.
Thin cover plate 5 edge and cavity 1 are by trip bolt compact siro spinning technology, and the stress that environmental change produces can only absorbing by thin cover plate 5.Traditional thin cover plate relies on deformation to absorb stress, and when 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, give thin cover plate 5 environmental stress by metallic briquette 4 and produce the corresponding power of maximum shape, make thin cover plate 5 under various circumstances with the close contact of TM01 mould dielectric resonator 6, the stress simultaneously making each environmental change produce can be discharged by the circular hole in the middle of thin cover plate 5, increases the useful life of filter.
The material of welding bars 8 is brass, on the one hand convenient and input and output weld, and the heat conduction being conducive to the generation of joint high-power signal on the other hand distributes.
The simulation calculation of dielectric filter of the present invention comprises the following steps:
1) according to the exponent number of charter index determination filter, corresponding quality factor q, sets up circuit model, comprehensive coupling matrix and circuit transmission characteristic.
2) resonance frequency required for calculating filter: use business software HFSS, set up resonant cavity model, select the dielectric resonator of dielectric constant, by adjustment resonant cavity size resonator size, make resonator resonance at required frequency, the quality factor q of resonator can be calculated simultaneously.
2) the coupling window size required for 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.Corresponding coupling amount can be drawn by the size adjusting coupling window.
3) the input and output coupling amount of calculating filter: utilize and launch time delay method, group delay with the pass of the input and output amount of coupling is
wherein M
01for inputing or outputing coupling, BW is bandwidth, τ (ω
0) be group delay; Input and output have employed magnetic coupling form, and adjustment joint height and the distance between welding bars and resonant rod, the group delay making emulation is equal with the group delay calculated, and draws the input and output coupling amount of filter.
4) above-mentioned result of calculation is adopted can to draw simulation model initial value, by S parameter method or the above-mentioned size of Y parameter method global optimization, filter final mask and electromagnetic transmission characteristic can be obtained, 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 is through expert evaluation, and the corresponding satellite model be applied to, achieve 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), tacldng 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), under metallic briquette (4) is positioned at 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 uniform be distributed on thin cover plate (5), and then makes dielectric resonator (6) contact well under various circumstances with cavity (1) and thin cover plate (5);
Thin cover plate (5) is closely connected by the top of trip bolt (11) with cavity (1); Dielectric resonator (6) is positioned between cavity (1) and thin cover plate (5), the centre of thin cover plate (5) respective chamber (1) has circular hole, 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); Tacldng medium block (8) lower end is positioned at dielectric resonator (6), and the circular hole that upper end is arranged in thin cover plate (5) causes skew for preventing its impact by tangential force of dielectric resonator (6); 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 metallic briquette (4) is loop configuration, the height of upper cover plate (2) bottom surface counterbore is greater than metallic briquette (4) highly, and diameter and metallic briquette (4) diameter compatible close.
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 or 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: described tacldng medium block (8) lower end is arranged in dielectric resonator (6) and upper end is arranged on after in the circular hole of thin cover plate (5), is connected with thin cover plate (5) by heat-conducting glue.
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 hole, centered finite position of described cavity (1), the diameter of limited pit equals the external diameter of dielectric resonator (6).
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| 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 |
| 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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| CN102136620B (en) * | 2010-09-03 | 2013-11-06 | 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 |
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