CN209822840U - Adjustable resonant cavity filter with temperature compensation frequency - Google Patents
Adjustable resonant cavity filter with temperature compensation frequency Download PDFInfo
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- CN209822840U CN209822840U CN201921051991.0U CN201921051991U CN209822840U CN 209822840 U CN209822840 U CN 209822840U CN 201921051991 U CN201921051991 U CN 201921051991U CN 209822840 U CN209822840 U CN 209822840U
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Abstract
The utility model discloses a tunable cavity filter that shakes with temperature compensation frequency has solved the wave filter and has been difficult to the fine setting, adjusts the problem that the precision is low. The tuning screw rod of the utility model drives the temperature compensation device to move axially through the adjusting mechanism, and the length of the cavity resonance line is slightly changed along with the temperature, so as to realize the compensation of the resonance frequency; the resonant frequency is adjusted by adopting the tuning screw rod, so that the pitch distance can be adjusted more accurately compared with a push-pull mode, and the adjustment is more accurate; along with the change of the temperature, the first compensation rod and the second compensation rod in the temperature compensation device generate relative motion and axial motion because of different expansion coefficients, so that the length of the cavity resonant line is slightly changed along with the temperature, the temperature compensation of the frequency-adjustable resonant filter is realized, and the adjustment precision is further increased. The utility model has the advantages of can be to adjustable resonant filter's of frequency temperature compensation, regulation precision height.
Description
Technical Field
The utility model relates to a wave filter, concretely relates to frequency tuning new technology tunable filter with frequency temperature compensation, square cavity appearance, rotation type.
Background
The filter is a frequency filtering device, namely, the filter selects signals of a required frequency band and suppresses signals of an unnecessary frequency band, and the filter is widely used in the communication fields of radio frequency, microwave and the like. At present, the most widely applied filter in radio frequency and microwave frequency bands is a coaxial cavity filter, and the relative area of a cavity is adjusted to change the resonant frequency.
VHF and UHF tunable resonator filters with temperature compensation frequency have not been reported in China. According to market research, foreign VHF frequency-tunable resonant filters applied in China have two structures, one is a round coaxial cavity, frequency tuning is realized by adopting a push-pull mode, and the resonant filter is provided with a temperature compensation device; the other is a square cavity structure, using a rotating frequency-tuned resonator filter.
Through long-term research and practice, the inventor finds that the resonant frequency of VHF and UHF is greatly influenced by temperature when being adjusted, the resonant frequency can be greatly changed when the temperature in the cavity is slightly changed, in addition, the filter adopts a push-pull mode, fine adjustment is difficult to realize when the area of the cavity is adjusted, and the adjustment precision is low.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a tunable cavity filter that shakes with temperature compensation frequency, when solving the resonant frequency who adjusts VHF and UHF, it is great to receive the temperature influence, when the temperature in the cavity changes a little, great change can take place for its resonant frequency, in addition, the filter adopts the push-and-pull mode to be difficult to realize the fine setting when adjusting the area of cavity, adjusts the problem that the precision is low.
The utility model discloses a following technical scheme realizes:
a tunable resonator filter with temperature compensation frequency comprises a shell, a fixed shaft connected in the shell, a tuning screw penetrating through the shell and extending into the fixed shaft, a temperature compensation device connected in the fixed shaft in a sliding manner and an adjusting mechanism, wherein one end of the tuning screw extending into the fixed shaft is connected with the temperature compensation device, and the tuning screw drives the temperature compensation device to move axially through the adjusting mechanism; the temperature compensation device comprises a cylindrical moving shaft and a temperature compensation assembly located in the moving shaft, the temperature compensation assembly comprises an upper end disc, a lower end disc and a moving shaft end disc which are connected in the moving shaft in a sliding mode, the temperature compensation assembly further comprises a first compensation rod and a second compensation rod, the first compensation rod is connected between the upper end disc and the moving shaft end disc after penetrating through the lower end disc, the second compensation rod is connected between the upper end disc and the lower end disc, expansion coefficients of the first compensation rod and the second compensation rod are different, and the tuning screw rod is connected with the lower end disc after penetrating through the upper end disc.
In the prior art, the problems that the resonant frequency of VHF and UHF is greatly influenced by temperature when being adjusted, the resonant frequency of the VHF and UHF changes slightly when the temperature in a cavity changes slightly, fine adjustment is difficult to realize when the area of the cavity is adjusted by adopting a push-pull mode and the adjusting precision of a filter in the prior art is low are solved. The application provides a tunable resonator filter with temperature compensation frequency.A tuning screw drives a temperature compensation device to axially move through an adjusting mechanism, so that the relative area of a cavity body is changed, and the resonance frequency is adjusted; the resonant frequency is adjusted by adopting the tuning screw rod, so that the pitch distance can be adjusted more accurately compared with a push-pull mode, and the adjustment is more accurate; along with the change of temperature, because the expansion coefficient of the first compensation rod and the second compensation rod in the temperature compensation device is different, the first compensation rod and the second compensation rod generate relative motion and do axial motion, and then the relative area of the cavity sends changes, so that the temperature compensation of the frequency-adjustable resonance filter is realized, and the adjustment precision is further increased.
Furthermore, after the temperature compensation device moves axially, the area of a cavity between the shell and the temperature compensation device changes, and the cavity is used for frequency tuning.
Furthermore, the first compensation rod and the second compensation rod move axially along with the change of the temperature inside the shell, and the area of a cavity between the shell and the temperature compensation device changes slightly for frequency compensation.
Preferably, the cavity inside the shell is a square cavity.
Preferably, adjustment mechanism includes rotatory hand wheel and nut, rotatory hand wheel is connected in the casing lateral wall and is connected with tuning screw, the nut is connected in the casing lateral wall and with tuning screw threaded connection.
Furthermore, the outer surface of the rotary hand wheel is provided with scales, the left side wall of the shell is provided with an identification rod, and the identification rod corresponds to the scales.
The utility model discloses have following advantage and beneficial effect:
1. the utility model relates to a tunable cavity filter that shakes with temperature compensation frequency has add temperature compensation device, and first compensation pole and second compensation pole in the temperature compensation device produce relative motion and be axial motion because coefficient of expansion is not equal, and then the relative area of cavity sends the change, realizes the temperature compensation to the adjustable resonance filter of frequency, further increases the regulation precision.
2. The utility model relates to an adjustable resonant cavity filter with temperature compensation frequency, the mode that adopts tuning screw rod is adjusted resonant frequency and can be more accurate for the push-and-pull mode adjust the pitch distance to the accuse for it is more accurate to adjust.
3. The utility model relates to a tunable cavity filter that shakes with temperature compensation frequency has add sign pole and scale, can finely tune according to the scale during regulation, further increases the regulation precision.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a sectional view of the present invention.
Fig. 2 is a cross-sectional view of the middle temperature compensation device of the present invention.
Fig. 3 is a schematic structural view of the middle rotating handwheel of the present invention.
Reference numbers and corresponding part names in the drawings:
1-shell, 11-marking rod, 2-fixed shaft, 3-tuning screw rod, 4-temperature compensation device, 41-moving shaft, 42-temperature compensation component, 421-upper end disc, 422-first compensation rod, 423-second compensation rod, 424-lower end disc, 425-moving shaft end disc, 5-adjusting mechanism, 51-rotating hand wheel, 511-scale and 52-nut.
Detailed Description
In the prior art, the problems that the resonant frequency of VHF and UHF is greatly influenced by temperature when being adjusted, the resonant frequency of the VHF and UHF changes slightly when the temperature in a cavity changes slightly, fine adjustment is difficult to realize when the area of the cavity is adjusted by adopting a push-pull mode and the adjusting precision of a filter in the prior art is low are solved. The present application provides a tunable resonator filter with temperature compensated frequency.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the scope of the present invention.
Example 1
As shown in fig. 1-2, an adjustable resonator filter with temperature compensation frequency includes a housing 1 and a fixed shaft 2 connected in the housing 1, and further includes a tuning screw 3 extending into the fixed shaft 2 after passing through the housing 1, a temperature compensation device 4 slidably connected in the fixed shaft 2, and an adjusting mechanism 5, wherein one end of the tuning screw 3 extending into the fixed shaft 2 is connected with the temperature compensation device 4, and the tuning screw 3 drives the temperature compensation device 4 to move axially through the adjusting mechanism 5; the temperature compensation device 4 comprises a cylindrical moving shaft 41 and a temperature compensation assembly 42 positioned in the moving shaft 41, wherein the temperature compensation assembly 42 comprises an upper end disc 421, a lower end disc 424 and a moving shaft 41 end disc 425 which are slidably connected in the moving shaft 41, the temperature compensation assembly 42 further comprises a first compensation rod 422 which penetrates through the lower end disc 424 and is connected between the upper end disc 421 and the moving shaft 41 end disc 425, and a second compensation rod 423 which is connected between the upper end disc 421 and the lower end disc 424, the expansion coefficients of the first compensation rod 422 and the second compensation rod 423 are different, and the tuning screw 3 penetrates through the upper end disc 421 and is connected with the lower end disc 424.
In the prior art, the problems that the resonant frequency of VHF and UHF is greatly influenced by temperature when being adjusted, the resonant frequency of the VHF and UHF changes slightly when the temperature in a cavity changes slightly, fine adjustment is difficult to realize when the area of the cavity is adjusted by adopting a push-pull mode and the adjusting precision of a filter in the prior art is low are solved. The application provides an adjustable resonant cavity filter with temperature compensation frequency, and a tuning screw 3 drives a temperature compensation device 4 to axially move through an adjusting mechanism 5The distance between the temperature compensation device 4 and the right side wall of the shell 1 is changed, so that the length of a quarter resonant line of a terminal short circuit formed by the cavity is changed, and the change of the resonant frequency is realized; the mode of adjusting the resonant frequency by adopting the tuning screw rod 3 can more accurately control and adjust the pitch distance compared with a push-pull mode, so that the adjustment is more accurate; along with the change of the temperature, the first compensation rod 422 and the second compensation rod 423 in the temperature compensation device 4 generate relative motion and axial motion because the expansion coefficients are different, so that the length of the cavity resonant line slightly changes along with the temperature, the compensation of the resonant frequency is realized, and the compensation is performed according to the formulaIt is obtained that when the length l of the resonance line is changed, the resonance frequency changes accordingly. Wherein f is the resonant frequency, c is the speed of light 3 × 1011mm/s, and l is the total length of the resonant line.
Furthermore, after the temperature compensation device 4 moves axially along with the temperature change, the total length of the resonant line changes slightly, so that the temperature drift of the resonance of the filter vibration frequency is compensated.
Preferably, the cavity inside the housing 1 is a square cavity.
Preferably, the adjusting mechanism 5 comprises a rotating handwheel 51 and a nut 52, the rotating handwheel 51 is connected to the outer side wall of the housing 1 and connected with the tuning screw 3, and the nut 52 is connected to the inner side wall of the housing 1 and in threaded connection with the tuning screw 3.
Example 2
As shown in fig. 3, this embodiment is further improved on the basis of embodiment 1, the outer surface of the rotating handwheel 51 is provided with a scale 511, the left side wall of the housing 1 is provided with a marking rod 11, and the marking rod 11 corresponds to the scale 511. And the time can be finely adjusted according to the scales, so that the adjustment precision is further increased.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A tunable resonator filter with temperature compensation frequency comprises a shell (1) and a fixed shaft (2) connected in the shell (1), and is characterized by further comprising a tuning screw rod (3) penetrating through the shell (1) and extending into the fixed shaft (2), a temperature compensation device (4) connected in the fixed shaft (2) in a sliding manner, and an adjusting mechanism (5), wherein one end of the tuning screw rod (3) extending into the fixed shaft (2) is connected with the temperature compensation device (4), and the tuning screw rod (3) drives the temperature compensation device (4) to move axially through the adjusting mechanism (5);
the temperature compensation device (4) comprises a cylindrical moving shaft (41) and a temperature compensation assembly (42) located in the moving shaft (41), the temperature compensation assembly (42) comprises an upper end disc (421), a lower end disc (424) and a moving shaft (41) end disc (425) which are connected in the moving shaft (41) in a sliding mode, the temperature compensation device further comprises a first compensation rod (422) and a second compensation rod (423), the first compensation rod (422) penetrates through the lower end disc (424) and then is connected between the upper end disc (421) and the moving shaft (41) end disc (425) and the second compensation rod (423) is connected between the upper end disc (421) and the lower end disc (424), expansion coefficients of the first compensation rod (422) and the second compensation rod (423) are unequal, and the tuning screw (3) penetrates through the upper end disc (421) and then is connected with the lower end disc (424).
2. A tunable resonator filter with temperature compensation frequency according to claim 1, wherein after the temperature compensation device (4) moves axially, the housing (1), the movable shaft (41) and the fixed shaft (2) form a short-circuited quarter-wave resonator, and when the axial length of the movable shaft (41) changes, the resonant frequency changes accordingly.
3. A tunable resonator filter with a temperature-compensated frequency according to any one of claims 1-2, wherein the first compensation rod (422) and the second compensation rod (423) axially move with the temperature change inside the housing (1), and the housing (1) is subjected to the temperature compensation device (4) to change the length of the moving shaft (41) with the temperature change, so as to realize the frequency compensation.
4. A tunable resonator filter with temperature compensated frequency according to claim 1, characterized in that the cavity inside the housing (1) is a square cavity.
5. A tunable resonator filter with temperature compensated frequency according to claim 1, where the adjustment mechanism (5) comprises a rotating hand wheel (51) and a nut (52), where the rotating hand wheel (51) is connected to the outer side wall of the housing (1) and connected to the tuning screw (3), and the nut (52) is connected to the inner side wall of the housing (1) and in threaded connection with the tuning screw (3).
6. A tunable resonator filter with temperature compensated frequency according to claim 5, characterized in that the outer surface of the rotating hand wheel (51) is provided with a scale (511), the left side wall of the housing (1) is provided with a marking rod (11), and the marking rod (11) corresponds to the scale (511).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921051991.0U CN209822840U (en) | 2019-07-05 | 2019-07-05 | Adjustable resonant cavity filter with temperature compensation frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921051991.0U CN209822840U (en) | 2019-07-05 | 2019-07-05 | Adjustable resonant cavity filter with temperature compensation frequency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209822840U true CN209822840U (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921051991.0U Active CN209822840U (en) | 2019-07-05 | 2019-07-05 | Adjustable resonant cavity filter with temperature compensation frequency |
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| CN (1) | CN209822840U (en) |
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- 2019-07-05 CN CN201921051991.0U patent/CN209822840U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A tunable resonator filter with temperature compensated frequency Effective date of registration: 20201215 Granted publication date: 20191220 Pledgee: Chengdu SME financing Company Limited by Guarantee Pledgor: CHENGDU MEISHU TECHNOLOGY Co.,Ltd. Registration number: Y2020980009365 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220823 Granted publication date: 20191220 Pledgee: Chengdu SME financing Company Limited by Guarantee Pledgor: CHENGDU MEISHU TECHNOLOGY CO.,LTD. Registration number: Y2020980009365 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A Tunable Cavity Filter with Temperature Compensation Frequency Effective date of registration: 20221027 Granted publication date: 20191220 Pledgee: Chengdu SME financing Company Limited by Guarantee Pledgor: CHENGDU MEISHU TECHNOLOGY CO.,LTD. Registration number: Y2022980019859 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230106 Granted publication date: 20191220 Pledgee: Chengdu SME financing Company Limited by Guarantee Pledgor: CHENGDU MEISHU TECHNOLOGY CO.,LTD. Registration number: Y2022980019859 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A Tunable Cavity Filter with Temperature Compensation Frequency Effective date of registration: 20230320 Granted publication date: 20191220 Pledgee: Chengdu SME financing Company Limited by Guarantee Pledgor: CHENGDU MEISHU TECHNOLOGY CO.,LTD. Registration number: Y2023980035261 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20231229 Granted publication date: 20191220 Pledgee: Chengdu SME financing Company Limited by Guarantee Pledgor: CHENGDU MEISHU TECHNOLOGY CO.,LTD. Registration number: Y2023980035261 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |