CN203747002U - Ultra-high-frequency band electrically tunable filter - Google Patents
Ultra-high-frequency band electrically tunable filter Download PDFInfo
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- CN203747002U CN203747002U CN201320888730.0U CN201320888730U CN203747002U CN 203747002 U CN203747002 U CN 203747002U CN 201320888730 U CN201320888730 U CN 201320888730U CN 203747002 U CN203747002 U CN 203747002U
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- electrically tunable
- tunable filter
- cavity
- coupling
- uhf band
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
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- 208000002925 dental caries Diseases 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 8
- 238000001914 filtration Methods 0.000 abstract description 4
- 230000008054 signal transmission Effects 0.000 abstract 1
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- 238000005516 engineering process Methods 0.000 description 3
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- 230000008485 antagonism Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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Abstract
The utility model discloses an ultra-high-frequency band electrically tunable filter. The ultra-high-frequency band electrically tunable filter includes a filter resonant cavity and a circuit control board; the filter resonant cavity at least comprises two cavity bodies and a coupling window; a resonant rod, a coupling ring and a radio frequency connector are arranged in each cavity body; one end of the coupling ring is connected with the resonant rod in the same cavity body, and the other end of the coupling ring is connected with the radio frequency connector in the same cavity body; and the coupling window is positioned between the two cavity bodies; a coupling loop is arranged in the coupling window; and the top end of each resonant rod passes through a hole formed at an upper part of a corresponding cavity body so as to be connected with the circuit control board through a signal transmission line. According to the ultra-high-frequency band electrically tunable filter of the utility model, the capacitance parameter of the filter resonant cavity can be changed through the circuit control board, so that resonant frequencies of a resonant network can be selected, and frequency selection and filtering functions of the electrically tunable filter can be realized; and the coupling ring and the coupling loop are adopted, a coupling coefficient can change with the center frequency of the pass band of the filter, so that the coupling coefficient can be consistent with the center frequency of the pass band of the filter, and therefore, the stability of the bandwidth of the pass band of the electrically tunable filter can be improved.
Description
Technical field
The utility model relates to the technical field of radio digital communication, particularly relates within the scope of uhf band the jamproof application in radio station under complex electromagnetic environment.
Background technology
Development along with electronic industrial technology, filter is widely used in various communication systems, as all be unableing to do without filter in the systems such as radar, navigation, identification, antagonism, guided missile, instrument, therefore along with the high speed development of microwave technology and electronic communication, high performance filter becomes very important research direction.In order to meet the reliability needs of modern communications under complex electromagnetic environment, to the antijamming capability in radio station, require more and more higher, Communication Anti-Jamming Techniques such as frequency hopping, spread spectrum also more and more receives publicity, and therefore, in following communication system, electrically tunable filter will play an important role.
The powerful bounce frequency filter technical development of machine driving is both at home and abroad comparative maturity till now, and the nineties in last century, the U.S. developed relevant product, calendar year 2001 the domestic report that also has Related product.Domestic up till now, many at the report aspect small-power at the bounce frequency filter of uhf band, document and report relevant aspect high-power are fewer.
Utility model content
The utility model provides a kind of uhf band miniaturization large power, electrically tunable filter, the electrically tunable filter that uses the utility model to design can be realized the passband overall offset of filter preferably, reaches according to actual needs the object of free selective filter band connection frequency in superfrequency UHF (Ultra High Frequency) 300MHz-3000MHz band limits.
In order to realize above-described technical purpose, the utility model by the following technical solutions:
A uhf band electrically tunable filter, comprises filter cavity and circuit control panel, and described filter cavity at least comprises two cavitys and coupling window, is respectively arranged with resonant rod, coupling loop and radio-frequency joint in each cavity; One end of coupling loop is connected with the resonant rod in same cavity, and the other end is connected with the radio-frequency joint in same cavity; Coupling window, between two cavitys, is provided with coupling loop in coupling window; The aperture that the top of every resonant rod is offered through cavity top is respectively connected by signal transmssion line with circuit control panel.
Preferably, described resonant rod is set to cylinder.
Preferably, described cavity is set to rectangular cavities.
Preferably, the bottom of described resonant rod and cavity bottom inner side fixedly mount by screw.
Preferably, the bottom of described resonant rod is vertically fixedly mounted on rectangular cavities bottom inside.
Preferably, described coupling loop is set to isosceles triangle, its top is arranged on to the bottom of coupling window center line, then by dieelctric sheet, the base of coupling loop is fixed on coupling window, and keeps coupling loop and two resonant rods to be positioned at same level.
Preferably, described coupling loop is set to spirality winding around.
Preferably, the two ends of described coupling loop all reserve isometric metal wire, after one end bending of metal wire, are connected with the resonant rod in same cavity.
Preferably, described metal wire adopts copper cash, and described bending angle is 90 degree.
Preferably, described circuit control panel comprises PIN diode and electric capacity, and PIN diode is connected with electric capacity.
Operation principle of the present utility model is: two rectangular cavities, two identical resonance round bars, two identical volution coupling loops, a triangle coupling loop forms the resonant network of high selectivity in L frequency range, this triangle coupling loop is compared traditional window coupling or bar coupling with the coupled modes of spiral shell coupling loop, the resonance point change with resonant network affects little on its relative bandwidth, by changing pin diode switch on control circuit board, change the electric capacity that accesses former resonant network, form new resonant network, realize the frequency-selective filtering of uhf band different frequency.
The utility model has following advantage and effect with respect to prior art:
1. the resonant cavity of electrically tunable filter of the present utility model adopts the coupled modes of triangle coupling loop and spiral shell type coupling loop, can obtain the stable coupling coefficient not fluctuating with filter passband frequency change, the pass band width that has overcome the electrically tunable filter of ordinary construction changes the defect fluctuating with the resonance point of filter cavity, realized the stable electrically tunable filter of performance parameter.
2. electrically tunable filter of the present utility model, can change by pin diode switch on change circuit control panel the electric capacity of resonant network, form new resonant network, compare and there is tunable advantage with the cavity body filter of ordinary construction, realized the frequency-selective filtering function of electrically tunable filter at uhf band different frequency.
3. the uhf band electrically tunable filter of the utility model Patent design, when guaranteeing miniaturization simple in structure, meeting high power capacity, has been realized the frequency hopping filter function of uhf band, has advantages of that electric property is stable.
4. in uhf band electrically tunable filter band of the present utility model, Insertion Loss is less than 2dB, departs from centre frequency 10% Out-of-band rejection and is greater than 23dB, and power capacity is greater than 30W, can effectively improve the ability of multimachine on the same stage and the antijamming capability of UHF communication equipment.
Accompanying drawing explanation
Fig. 1 is the cutaway view of electrically tunable filter described in the utility model;
Fig. 2 is the vertical view of electrically tunable filter described in the utility model;
Fig. 3 is the theory diagram of electrically tunable filter described in the utility model.
Description of reference numerals: 1-cavity, 2-resonant rod, 3-coupling loop, 4-coupling window, 5-coupling loop, 6-dieelctric sheet, 7-circuit control panel, 8-radio-frequency joint.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited to this.
As shown in Figure 1 and Figure 2, the utility model provides a kind of uhf band electrically tunable filter, filter cavity, circuit control panel 7 and signal input output end three parts, consists of, and wherein input and output are for being respectively two radio-frequency joints 8.
Filter cavity is comprised of two rectangular cavities 1 and coupling window 4, and wherein coupling window 4 is positioned in the middle of two rectangular cavities 1, in two rectangular cavities 1, be respectively arranged with columned resonant rod 2, spirality coupling loop 5 and radio-frequency joint 8, spirality coupling loop 5 is positioned at the outside of columned resonant rod 2, the two ends of described coupling loop 5 all reserve isometric copper cash, the copper cash of spirality coupling loop 5 one end is carried out being connected with the columned resonant rod 2 facing mutually after 90 degree bendings, the copper cash of the other end and the radio-frequency joint in this cavity 8 are installed, due to this connected mode magnetic coupling mode that is filter, can effectively reduce the bandwidth variation that electrically tunable filter frequency change causes, adopt solenoid two ends to connect the structure of two-section optical copper wire simultaneously, the impact of the variation that can effectively reduce electrically tunable filter frequency on the magnetic coupling degree of itself and resonant cavity, the bottom of columned resonant rod 2 fixedly mounts by screw is vertical with rectangular cavities 1 bottom inside, and the aperture that the top of columned resonant rod 2 is offered through cavity 1 top is connected by signal transmssion line with circuit control panel 7.
Described coupling window 4 is between two cavitys 1, in it, be provided with isosceles triangle coupling loop 3, the top of triangle coupling loop 3 is arranged on the bottom of coupling window 4 center lines, then by dieelctric sheet 6, the base of coupling loop 3 is fixed on coupling window 4, and keeps coupling loop 3 and two columned resonant rods 2 to be positioned at same level while installing.Triangle coupling loop coordinates with coupling window and forms the little magnetic coupling of frequency response effect, and the impact of the variation that this magnetic-coupled mode can effectively reduce electrically tunable filter frequency on the magnetic coupling degree between resonant cavity, plays the effect of stablizing bandwidth.
As shown in Figure 3, in the uhf band electrically tunable filter of the present embodiment, circuit control panel 7 comprises PIN diode and electric capacity, by changing the level of the PIN diode on circuit control panel 7, can control the capacitance that is linked into cylindric resonant rod in resonant network, the resonance frequency that changes resonant network to realize reaches the function of frequency-selective filtering.
Above-described embodiment is preferably execution mode of the utility model; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection range of the present utility model.
Claims (10)
1. a uhf band electrically tunable filter, it is characterized in that: comprise filter cavity and circuit control panel (7), described filter cavity at least comprises two cavitys (1) and coupling window (4), is respectively arranged with resonant rod (2), coupling loop (5) and radio-frequency joint (8) in each cavity (1); One end of coupling loop (5) is connected with the resonant rod (2) in same cavity, and the other end is connected with the radio-frequency joint (8) in same cavity; Coupling window (4) is positioned between two cavitys (1), is provided with coupling loop (3) in coupling window (4); The aperture that the top of every resonant rod (2) is offered through cavity (1) top is respectively connected by signal transmssion line with circuit control panel (7).
2. uhf band electrically tunable filter according to claim 1, is characterized in that: described resonant rod (2) is set to cylinder.
3. uhf band electrically tunable filter according to claim 1, is characterized in that: described cavity (1) is set to rectangular cavities.
4. uhf band electrically tunable filter according to claim 1, is characterized in that: the bottom of described resonant rod (2) and cavity (1) bottom inside fixedly mount by screw.
5. according to the uhf band electrically tunable filter described in claim 1-4 any one, it is characterized in that: the bottom of described resonant rod (2) is vertically fixedly mounted on rectangular cavities (1) bottom inside.
6. uhf band electrically tunable filter according to claim 1, it is characterized in that: described coupling loop (3) is set to isosceles triangle, its top is arranged on to the bottom of coupling window (4) center line, by dieelctric sheet (6), the base of coupling loop (3) is fixed on to coupling window (4) upper, and keeps coupling loop (3) and two resonance thick sticks (2) to be positioned at same level.
7. uhf band electrically tunable filter according to claim 1, is characterized in that: described coupling loop (5) is set to spirality winding around.
8. uhf band electrically tunable filter according to claim 1, is characterized in that: the two ends of described coupling loop (5) all reserve isometric metal wire, after one end bending of metal wire with same cavity in resonant rod (2) install.
9. uhf band electrically tunable filter according to claim 8, is characterized in that: described metal wire adopts copper cash, and described bending angle is 90 degree.
10. uhf band electrically tunable filter according to claim 1, is characterized in that: described circuit control panel (7) comprises PIN diode and electric capacity, and described PIN diode is connected with electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320888730.0U CN203747002U (en) | 2013-12-31 | 2013-12-31 | Ultra-high-frequency band electrically tunable filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320888730.0U CN203747002U (en) | 2013-12-31 | 2013-12-31 | Ultra-high-frequency band electrically tunable filter |
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| Publication Number | Publication Date |
|---|---|
| CN203747002U true CN203747002U (en) | 2014-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320888730.0U Expired - Lifetime CN203747002U (en) | 2013-12-31 | 2013-12-31 | Ultra-high-frequency band electrically tunable filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323525A (en) * | 2019-07-02 | 2019-10-11 | 闻泰科技(无锡)有限公司 | Board structure of circuit |
| CN113285193A (en) * | 2021-04-20 | 2021-08-20 | 武汉德威斯电子技术有限公司 | Zero-point adjustable frequency hopping filter |
-
2013
- 2013-12-31 CN CN201320888730.0U patent/CN203747002U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323525A (en) * | 2019-07-02 | 2019-10-11 | 闻泰科技(无锡)有限公司 | Board structure of circuit |
| CN113285193A (en) * | 2021-04-20 | 2021-08-20 | 武汉德威斯电子技术有限公司 | Zero-point adjustable frequency hopping filter |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140730 |