CN203013899U - Temperature compensation mechanism for resonant cavity - Google Patents
Temperature compensation mechanism for resonant cavity Download PDFInfo
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- CN203013899U CN203013899U CN 201220417115 CN201220417115U CN203013899U CN 203013899 U CN203013899 U CN 203013899U CN 201220417115 CN201220417115 CN 201220417115 CN 201220417115 U CN201220417115 U CN 201220417115U CN 203013899 U CN203013899 U CN 203013899U
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- temperature compensation
- metal bar
- resonant cavity
- power source
- compensation mechanism
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Abstract
The utility model provides a temperature compensation mechanism for a resonant cavity. The temperature compensation mechanism is mounted on a cavity wall of the resonant cavity, and comprises a metal perturbation rod, a power source, an offsetting component, an outer shell, a contact spring, a power source movable front end, and a metal perturbation rod connecting rod. The temperature compensation mechanism is suitable for rectangular and cylindrical waveguide resonant cavities and can be also applied to a coaxial cavity. The temperature compensation mechanism is installed in the proper position of the resonant cavity, and the metal perturbation rod is inserted in the resonant cavity, when the temperature changes, the power source and the offsetting component in the temperature compensation mechanism can push the metal perturbation rod to change the position together, thereby the frequency of the resonant cavity is adjusted and the effect of temperature compensation is achieved.
Description
Technical field
The utility model relates to the temperature compensation mechanism for resonant cavity, specifically, relates to the temperature compensation mechanism that utilizes the disturbance metal bar to realize the temperature-compensating of resonant cavity.
Background technology
Resonant cavity is important microwave device, is widely used in the equipment such as filter, power combiner.Resonance frequency is one of most important parameter of resonant cavity., due to the power loss of resonant cavity, have part energy and be converted into heat energy when containing the equipment of resonant cavity when the high power broadcast TV RF signals, the temperature of equipment can raise, and causes the volume of resonant cavity and shape that small variation occurs.Although this variation naked eyes discover less than, can cause the drift of resonance frequency, thereby the performance of equipment is changed, affect its normal use.So the microwave cavity in practical application must have good temperature stability, must guarantee that the resonance frequency of resonant cavity keeps constant in certain temperature range.
In order to make microwave cavity that good temperature characterisitic be arranged, method relatively more commonly used generally can be divided into two kinds at present.A kind of is to adopt the little indium Steel material of thermal coefficient of expansion to make resonant cavity.The frequency stability of the resonant cavity that this material is made is 10 times of left and right of the resonant cavity made by common copper or aluminium, but the shortcoming of indium Steel material is also many, and is as high in cost, to be not easy welding, conduction rate variance, density of material large etc.The inwall of the cavity that the indium steel is made must silver-platedly could use.Because silver and the temperature expansion coefficient of indium steel differ greatly, in use because temperature changes repeatedly, the silver coating that is attached on the indium steel can peel off when cavity.When having a fritter first to peel off, this place is because the difference of indium steel and silver-colored conductance can cause sparking, thus the damage of acceleration cavity.
The another kind of method that increases the resonant cavity temperature stability is carried out temperature-compensating to resonant cavity exactly.Temperature-compensating (Temperature Compensation) is exactly to use someway, and the impact that compensation temperature causes resonant frequency is stabilized in the resonance frequency of resonant cavity in an acceptable scope.
Due to technique for temperature compensation importance in actual applications, the various temperature compensation technique has appearred at present.As shown in Fig. 1 a, Fig. 1 b " change the resonant cavity profile " technology is wherein a kind of.For rectangle and circle post waveguide resonant cavity, their resonance frequency is determined by the outside dimension of resonant cavity.Therefore, change some overall dimension of resonant cavity, can reach the effect of temperature-compensating.For the different mode of resonance of resonant cavity, need the position of correct selection profile disturbance.Fig. 1 a is the situation that cavity wall moves horizontally, and Fig. 1 b is the situation of cavity wall stress deformation.This temperature compensation is intuitively effective, but shortcoming is also obvious.For the situation of Fig. 1 a, cavity wall need to solve the mobile cavity body wall with the contact problems of other cavity wall well owing to moving freely; For the situation of Fig. 1 b, because the stressed needs of cavity wall are suitably crooked, therefore have higher requirements on manufacture craft, and the motive force that this temperature compensation needs is larger.
Another is exactly the technology of " fixing coaxial cavity inner conductor length ".For the coaxial resonant cavity of capacitive load, temperature is mainly that the inner wire length variations causes on the impact of resonance frequency.A kind of method that increases the coaxial resonant cavity temperature stability is exactly the length of fixing coaxial cavity inner conductor.As shown in Fig. 1 c.In this structure, the inner wire of coaxial cavity is comprised of two parts, uses the reed contact between them, makes moving freely that these two parts can be relative.Inner wire 2 links together by an indium steel bar with outer conductor.Because the thermal coefficient of expansion of indium steel is very little, can think that when temperature raise, inner wire 2 was fixed.Although inner wire 1 expanded by heating, length increases, and the total length of inner wire does not change, and has so just played the effect of stable resonant oscillation frequency.This way has some not enough.At first be that temperature-compensating is incomplete.Although when this structure can guarantee variations in temperature, inner wire length is substantially constant, the cavity outer conductor is vicissitudinous, and this resonance frequency to resonant cavity is influential equally.Next is exactly the contact problems of reed.Reed repeatedly moves and rubs and may make reed lose efficacy.
The utility model content
In order to overcome above-mentioned shortcoming, the utility model provides a kind of temperature compensation mechanism for resonant cavity.Described temperature compensation mechanism is arranged on the cavity wall of resonant cavity, and it comprises disturbance metal bar, power source, biasing member, shell, contact spring, the movable front end of power source and disturbance metal bar pitman.Wherein, described shell is the cylinder chamber with blind end and open end, and the blind end of described shell is in outside the cavity of resonant cavity, within the open end of described shell is in the cavity of resonant cavity; The both sides of described shell have bar-shaped trough, and described bar-shaped trough is in order to the described disturbance metal bar pitman of the open end that is mounted on described disturbance metal bar; The barred body of described disturbance metal bar partly stretches out outside the open end of described shell, extend in the cavity of described resonant cavity; One end of the movable front end of described power source is against on described disturbance metal bar pitman, and the other end of the movable front end of described power source is arranged on the place ahead of described power source with the telescopic moving along with described power source expanded by heating; Described power source is positioned at the inside of the hollow barred body of described disturbance metal bar, and is structure as a whole with described shell; One end of described bigoted member is against the inboard of the hollow barred body of described disturbance metal bar, described biasing member between the inwall of described power source and described disturbance metal bar to provide and the rightabout active force of described power source; Be formed with and the parallel plane annular groove in the open end of described shell on the inwall near open end one side of described shell, described contact spring be arranged among described annular groove and with described disturbance metal bar Elastic Contact, and described disturbance metal bar is remaining the good contact with described contact spring in sliding up and down process.
According to temperature compensation mechanism of the present utility model, preferably, described power source is the Paraffin thermal expansion device.The paraffin that this device will contain the red copper powder is sealed in device inside, plays the effect that power is provided for whole temperature compensation mechanism.
According to temperature compensation mechanism of the present utility model, preferably, described biasing member is spring.
According to temperature compensation mechanism of the present utility model, preferably, described contact spring is made by conductor, possesses certain elasticity and good electric conductivity, guarantees described shell and the good conductive contact of described disturbance metal bar.
According to temperature compensation mechanism of the present utility model, preferably, the movable front end of described power source is metal cylinder, with the telescopic moving along with the power source expanded by heating.
According to temperature compensation mechanism of the present utility model, preferably, described disturbance metal bar is non-complete hollow cylinder structure.The blind end of described disturbance metal bar is complete hollow cylinder, gos deep into intra resonant cavity; The open end of described disturbance metal bar is non-complete cylinder, in order to the described metal bar pitman of disturbance and described disturbance metal bar are installed together.
According to temperature compensation mechanism of the present utility model, preferably, the outside of described shell is arranged on the cavity wall of described resonant cavity with the screw thread that coordinates with the cavity wall of described resonant cavity.
According to temperature compensation mechanism of the present utility model, preferably, pass through conductive solder, conductive adhesive or sealing socket connection between the cavity wall of described shell and described resonant cavity.Described resonant cavity is rectangular-wave resonant cavity, cylindrical waveguide resonant cavity, coaxial cavity.
Temperature compensation mechanism of the present utility model is applicable to rectangular-wave resonant cavity and cylindrical waveguide resonant cavity, equally also can be applied in coaxial cavity.This temperature compensation mechanism is arranged on resonant cavity suitable position, and the disturbance metal bar namely can insert in resonant cavity.When variations in temperature, the power source in temperature compensation mechanism and biasing member meeting acting in conjunction promote the disturbance metal bar and change the position, thereby regulate the frequency of resonant cavity, play the effect of temperature-compensating.
Description of drawings
Fig. 1 a carries out the schematic diagram of the temperature compensation mechanism of temperature-compensating according to the position of passing through change resonant cavity body wall of prior art;
Fig. 1 b carries out the schematic diagram of the temperature compensation mechanism of temperature-compensating according to the shape of passing through change resonant cavity body wall of prior art;
Fig. 1 c is the schematic diagram according to the temperature compensation mechanism of the coaxial resonant cavity of prior art;
Fig. 2 represents the temperature compensation mechanism according to a kind of execution mode of the present utility model.
Description of reference numerals is as follows:
Temperature compensation mechanism 100, disturbance metal bar 101, power source 102, biasing member 103, shell 104, contact spring 105, the movable front end 106 of power source, disturbance metal bar pitman 107.
Embodiment
In order to make the auditor can further understand structure of the present utility model, feature and other purposes, now being accompanied by accompanying drawing in conjunction with appended preferred embodiment is described in detail as follows, the illustrated embodiment of this accompanying drawing only is used for the explanation the technical solution of the utility model, and non-limiting the utility model.
The utility model has provided and has adopted the Paraffin thermal expansion device as the temperature compensation mechanism of power source.The Paraffin thermal expansion device produces power along with the variation of cavity environment temperature, and working with biasing member one promotes the disturbance metal bar and move in cavity, thereby compensates is on the impact of cavity resonant frequency.
Fig. 2 is the schematic diagram according to the temperature compensation mechanism of a kind of execution mode of the present utility model.As shown in Figure 2, temperature compensation mechanism 100 comprises disturbance metal bar 101, power source 102, biasing member 103, shell 104, contact spring 105, the movable front end 106 of power source and disturbance metal bar pitman 107.The screwed hole (not shown) that temperature compensation mechanism 100 passes on the cavity wall of resonant cavity is arranged on the cavity wall of resonant cavity, also be provided with on the through-hole wall that arranges on the resonator body wall with shell 104 outer walls on the screw thread of screw thread coupling, thereby shell 104 and resonant cavity can be installed as one.In addition, coordinating also between the shell 104 of temperature compensation mechanism 100 and resonator body wall can be adopted alternate manner, and for example conductive solder, conductive adhesive, sealing are pegged graft etc.
As shown in Figure 2, disturbance metal bar 101, power source 102, biasing member 103, contact spring 105, the movable front end 106 of power source and disturbance metal bar pitman 107 all are arranged in shell 104.That part that shell 104 has blind end is in outside the resonant cavity cavity, within that part with open end is in the resonant cavity cavity.The barred body of disturbance metal bar 101 partly stretches out outside the open end of shell 104, extend in the resonant cavity cavity.
As shown in Figure 2, power source 102 is structure as a whole with shell 104, can not produce relative displacement between both.The both sides of shell 104 have bar-shaped trough, so that disturbance metal bar pitman 107 is arranged on disturbance metal bar 101, make both to become as a whole.Disturbance metal bar 101 is non-complete hollow cylinder structure, and its blind end is complete hollow cylinder, gos deep into intra resonant cavity, and its open end is non-complete circle rod structure, so that disturbance metal bar pitman 107 and disturbance metal bar 101 are installed together.
As shown in Figure 2, the movable front end 106 of power source is arranged on the place ahead of power source 102, can the telescopic moving along with power source 102 expanded by heating.The movable front end 106 of power source is against on disturbance metal bar pitman 107, when power source 102 expanded by heating, can move by the movable front end 106 in propulsion power source, thereby promote disturbance metal bar pitman 107 and drive disturbance metal bar 101, direction towards the resonant cavity outside moves, and disturbance metal bar 101 " is extracted " resonant cavity.Biasing member 103 provides and the rightabout active force of power source 102 between the inwall of power source 102 and disturbance metal bar 101.Under the acting in conjunction of power source 102, the movable front end 106 of power source and biasing member 103, disturbance metal bar 101 is suspended among shell 104 together with disturbance metal bar pitman 107.
As shown in Figure 2, in shell 104, the contact spring 105 that conductor is made is installed also.This contact spring 105 is arranged in annular groove on outer casing inner wall.Contact spring 105 and disturbance metal bar 101 Elastic Contact, and disturbance metal bar 101 is remaining the good contact with contact spring 105 in sliding up and down process.Owing to having good electric conductivity, contact spring 105 is used for guaranteeing that 104, disturbance metal bar 101 and shell keep good conductive to contact.Like this, kept good conductive to be connected owing to making by for example threaded engagement between shell 104 and resonator body wall, guaranteed that therefore between disturbance metal bar 101 and resonator body wall, the maintenance good conductive is connected.
As shown in Figure 2, biasing member 103 can be spring.This biasing member 103 provides the thrust direction that provides with power source 102 opposite bias force for disturbance metal bar 101.
According to execution mode shown in Figure 2, when temperature rises, after paraffin expanded by heating in power source 102, volume increases, therefore power source 102 is by the movable front end 106 of power source and disturbance metal bar pitman 107, thrust to disturbance metal bar 101 increases, broken the original balance between the thrust of the bias force of biasing member 103 and power source 102, so that promoting disturbance metal bar 101 moves to the direction of resonant cavity outside, until again reach balance between the thrust of the bias force of biasing member 103 and power source 102, movement just can stop.At this moment, disturbance metal bar 101 is by to a certain extent " extracting " resonant cavity, thereby reaches the purpose of regulating resonance frequency.
Temperature compensation mechanism of the present utility model is applicable to rectangle and circle post waveguide resonant cavity, equally also can be applied in coaxial cavity.This temperature compensation mechanism is arranged on resonant cavity suitable position, make the disturbance metal bar be inserted in resonant cavity, when variations in temperature, the temperature-sensitive power source in device can promote the disturbance metal bar and change the position, thereby regulate the frequency of resonant cavity, play the effect of temperature-compensating.
The utility model should be appreciated that by the explanation of above embodiment the utility model is not limited to described embodiment and scheme; Here these that comprise are implemented and the purpose of scheme is, help those skilled in the art to put into practice the utility model; Those skilled in the art is easy in the situation that do not break away from the utility model design, further Improvement and perfection.Therefore, the utility model only is subjected to the restriction of the application's claims, and all various technical schemes identical with the utility model design are all within this claim protection range.
Claims (10)
1. temperature compensation mechanism that is used for resonant cavity, described temperature compensation mechanism (100) is arranged on the cavity wall of resonant cavity, it is characterized in that, described temperature compensation mechanism (100) comprises disturbance metal bar (101), power source (102), biasing member (103), shell (104), contact spring (105), the movable front end (106) of power source and disturbance metal bar pitman (107); Wherein:
Shell (104) is for having the cylinder chamber of blind end and open end, and the blind end of shell (104) is in outside the cavity of resonant cavity, within the open end of shell (104) is in the cavity of resonant cavity;
The both sides of shell (104) have bar-shaped trough, and described bar-shaped trough is in order to the disturbance metal bar pitman (107) of the open end that is mounted on disturbance metal bar (101);
The barred body of disturbance metal bar (101) partly stretches out outside the open end of shell (104), extend in the cavity of described resonant cavity;
One end of the movable front end of power source (106) is against on disturbance metal bar pitman (107), and the other end of the movable front end of power source (106) is arranged on the place ahead of power source (102) with the telescopic moving along with power source (102) expanded by heating;
Power source (102) is positioned at the inside of the hollow barred body of described disturbance metal bar (101), and is structure as a whole with shell (104);
One end of described biasing member (103) is against the inboard of the hollow barred body of described disturbance metal bar (101), and biasing member (103) is positioned between the inwall of power source (102) and disturbance metal bar (101) to provide and the rightabout active force of power source (102);
Be formed with the parallel plane annular groove in open end with shell (104) on the inwall near open end one side of shell (104), contact spring (105) be arranged among described annular groove and with disturbance metal bar (101) Elastic Contact, and disturbance metal bar (101) is remaining the good contact with contact spring (105) in sliding up and down process.
2. temperature compensation mechanism as claimed in claim 1, is characterized in that, described power source (102) is the Paraffin thermal expansion device, to provide power to described temperature compensation mechanism.
3. temperature compensation mechanism as claimed in claim 1, is characterized in that, described biasing member (103) is spring.
4. temperature compensation mechanism as claimed in claim 1, is characterized in that, described contact spring (105) is made by conductor.
5. temperature compensation mechanism as claimed in claim 1, is characterized in that, the movable front end of described power source (106) is metal cylinder, with the telescopic moving along with the power source expanded by heating.
6. temperature compensation mechanism as claimed in claim 1, is characterized in that, described disturbance metal bar (101) is non-complete hollow cylinder structure.
7. temperature compensation mechanism as claimed in claim 6, is characterized in that, the blind end of described disturbance metal bar (101) is complete hollow cylinder, gos deep into the inside of resonant cavity; The open end of described disturbance metal bar (101) is non-complete cylinder, in order to disturbance metal bar pitman (107) and disturbance metal bar (101) are installed together.
8. temperature compensation mechanism as claimed in claim 1, is characterized in that, the outside of described shell (104) is arranged on the cavity wall of described resonant cavity with the screw thread that coordinates with the cavity wall of described resonant cavity.
9. temperature compensation mechanism as claimed in claim 8, is characterized in that, passes through conductive solder, conductive adhesive or sealing socket connection between the cavity wall of described shell (104) and described resonant cavity.
10. as claim 1,7,8 or 9 described temperature compensation mechanisms, it is characterized in that, described resonant cavity is rectangular-wave resonant cavity, cylindrical waveguide resonant cavity or coaxial cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220417115 CN203013899U (en) | 2012-08-21 | 2012-08-21 | Temperature compensation mechanism for resonant cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220417115 CN203013899U (en) | 2012-08-21 | 2012-08-21 | Temperature compensation mechanism for resonant cavity |
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| Publication Number | Publication Date |
|---|---|
| CN203013899U true CN203013899U (en) | 2013-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220417115 Expired - Fee Related CN203013899U (en) | 2012-08-21 | 2012-08-21 | Temperature compensation mechanism for resonant cavity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104347919A (en) * | 2013-08-08 | 2015-02-11 | 北京飞卡科技有限公司 | Temperature compensation device and temperature compensation method for microwave filter |
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2012
- 2012-08-21 CN CN 201220417115 patent/CN203013899U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104347919A (en) * | 2013-08-08 | 2015-02-11 | 北京飞卡科技有限公司 | Temperature compensation device and temperature compensation method for microwave filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130619 Termination date: 20210821 |
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| CF01 | Termination of patent right due to non-payment of annual fee |