CN202434677U - High pass filter - Google Patents
High pass filter Download PDFInfo
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- CN202434677U CN202434677U CN2011205383172U CN201120538317U CN202434677U CN 202434677 U CN202434677 U CN 202434677U CN 2011205383172 U CN2011205383172 U CN 2011205383172U CN 201120538317 U CN201120538317 U CN 201120538317U CN 202434677 U CN202434677 U CN 202434677U
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- microstrip line
- pass filter
- high pass
- inductance
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Abstract
The utility model discloses a high pass filter which comprises a panel-shaped insulating substrate, a signal input end, an output end, at least one microstrip capacitor and at least one microstrip inductor, wherein the signal input end and the output end are formed on the insulating substrate; the microstrip capacitors are formed on the insulating substrate, are connected in series with one another and are connected between the signal input end and the output end; and the microstrip inductors are formed on the insulating substrate, one end of each of the microstrip inductors is connected with each of the microstrip capacitors, and the other end of each of the microstrip inductors is grounded.
Description
Technical field
The utility model relates to the wave filter technology field, is specifically related to a kind of high pass filter.
Background technology
Along with the development of radiotechnics, wave filter technology more and more becomes the center of many design problems in the radiotechnics.In the prior art, filter is commonly used to separately or is combined into different frequencies, because electromagnetic spectrum is limited, therefore must filter be distributed by different application.Filter both can be used to limit the radiation of high-power transmitter in allocated frequency band, can be used for again preventing that receiver from receiving the interference beyond the working band.The network that in impedance matching, also has the picture filter, as between the transmission line of two different qualities impedances, or between the load (like the diode in the parametric amplifier) of generator that internal resistance is arranged and reactance.Sometimes need obtain certain phase place (or time-delay) characteristic,, or compensate phase distortion that other filters or chromatic dispersion structure (like one section waveguide) produced etc., also need filter like pulse compression or broadening.In a word, from myriametric wave through microwave to all electromagnetic wave bands more than the light wave, all need filter.
Usually call microwave circuit (also claiming radio circuit) to the circuit of the wavelength of working frequency range between 10m to 1cm (being 30MHz to 30GHz).Because the operating frequency of microwave circuit is higher, therefore when designing filter,, compare with digital circuit with general low-frequency channel to aspects such as material, structure, circuit form, components and parts and methods for designing, the place of a lot of differences and many uniquenesses is arranged.Microwave filter can be divided into low pass filter, high pass filter, band pass filter and band stop filter by effect, is divided into lamped element LC mode filter and transmission line type filter by implementation.The LC mode filter is made up of inductance element and capacitor, and wherein the inductance element volume is bigger, so the LC mode filter is not easy to integrated.The transmission line type filter is divided into types such as waveguide, coaxial line, strip line and little band according to its basic structure.The used element of low pass filter and high pass filter is independent inductance and electric capacity, and this is easy to obtain in lumped circuit, but comparatively difficult on microwave transmission line, and the difference linear according to transmission, and the complexity of embodiment is also different.In general, the inductance of half lumped parameter (promptly roughly having lumped parameter character) and electric capacity are easier to realize that coaxial line takes second place, and in waveguide, just wants the structure of more complicated on microstrip line.Microstrip line has high impedance line and low-impedance line, and the high impedance line is similar to inductance, and low-impedance line is similar to electric capacity.Realize that with the reactance component of transmission line conversion can obtain inductance and electric capacity, yet inductance after the conversion or capacitance can only be similar to, factors such as mismachining tolerance, surface treatment, spillage of material force the research and development of microwave/radio-frequency filter that the experiment adjustment must be arranged.
In order to overcome the above-mentioned drawback of traditional implementation, this has been carried out some correlative study experiments both at home and abroad:
Application number is 200410063717.7 " spiral inductor ", and a kind of reduction that can suppress self-resonant frequency is provided, and improves the spiral in ductor of quality factor q.This inductor has flat insulated substrate, and forms conductive pattern, keeping to each other at interval and be configured to helical form, have the conductor of certain width in the basic side of one side at least of this insulation; Owing to the inboard interval of vortex shape forms narrowlyer than the interval in the vortex shape outside, therefore be positioned at the inboard conductor of vortex shape, when the winding diameter change was big, it is close that the coupling between conductor becomes, and it is big that inductance becomes, and consequently can improve quality factor q.Yet the inductance value precision of this inductor is still indeterminate, and has the integrated problem that is not easy to of LC mode filter existence equally, still is not suitable for being used as the filter element in microwave/radio circuit.
The utility model content
Can't accurately control for overcoming the microwave filtering circuit inductance element inductance value that exists in the prior art, selecting frequency characteristic is poor, is not easy to problems such as integrated, and the utility model provides a kind of high pass filter.
The utility model embodiment provides a kind of high pass filter, and described high pass filter comprises: flat insulated substrate; Signal input part and output are formed on the described insulated substrate; At least one microstrip line electric capacity is formed on the described insulated substrate, and described at least one microstrip line electric capacity is one another in series and is connected between described input and the output; At least one microstrip line inductance is formed on the described insulated substrate, and an end of described at least one microstrip line inductance links to each other with described at least one microstrip line electric capacity respectively, the other end ground connection of described at least one microstrip line inductance.
The high pass filter that the utility model embodiment provides uses the spiral microstrip line of high impedance to substitute inductor as reactance component, and adopts the mode of cascade to realize high-pass filtering.Make the inductance value of high pass filter accurately controlled, and reach beneficial effects such as volume is little, in light weight, bandwidth, reliability height, low cost of manufacture, and be easy to be integrated in the microwave circuit.
The utility model relates generally to and a kind ofly substitutes inductance with the helix microstrip line and realize the filter of high-pass filtering and the application in spectrum analyzer thereof.
Description of drawings
Accompanying drawing described herein is used to provide the further understanding to the utility model, constitutes the application's a part, does not constitute the qualification to the utility model.In the accompanying drawings:
Fig. 1 is the figure that the utility model embodiment provides;
Fig. 2 is the equivalent circuit diagram of high pass filter 100 shown in Figure 1;
The actual emulation design sketch of the high pass filter 100 that Fig. 3 provides for the utility model embodiment;
Fig. 4 is the structure chart of a kind of high pass filter of providing of the utility model embodiment.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is explained further details below in conjunction with execution mode and accompanying drawing.At this, exemplary embodiment of the utility model and explanation thereof are used to explain the utility model, but not as the qualification to the utility model.
Embodiment one
Fig. 1 is the structure chart of a kind of high pass filter of providing of the utility model embodiment, and Fig. 2 is the equivalent circuit diagram of high pass filter 100 shown in Figure 1, and like Fig. 1, shown in Figure 2, described high pass filter 100 comprises:
Flat insulated substrate 101.
In the utility model embodiment, insulated substrate 101 can be a PCB (PrintedCircuitBoard, a printed circuit board).
At least one microstrip line electric capacity 104 is formed on the described insulated substrate, and described at least one microstrip line electric capacity is one another in series and is connected between described input and the output.
In the utility model embodiment; With 4 rank filters is that example describes; Be to have 4 groups of microstrip line electric capacity and inductance in the high pass filter 100, however the utility model not as limit, those skilled in the art can dispose the filter of any exponent number according to practical application.The 4 rank high pass filters that the utility model embodiment provides are mainly used in the frequency spectrograph, and high more at other exponent numbers of using median filter, the amplitude fading at cut-off frequency place is fast more, but also can introduce bigger insertion loss simultaneously.
In the utility model embodiment; Microstrip line electric capacity 104 is the electric capacity with the microstrip line equivalence; With 4 microstrip line electric capacity difference called after C1, C2, C3, C4, microstrip line electric capacity 104 can be the parallel Copper Foil that is printed on the insulated substrate 101, according to the actual requirements; The size of each microstrip line electric capacity can be consistent each other with shape, also can have different sizes and shape respectively.
At least one microstrip line inductance 105 is formed on the described insulated substrate, and an end of described at least one microstrip line inductance links to each other with described at least one microstrip line electric capacity respectively, the other end ground connection of described at least one microstrip line inductance.
In the utility model embodiment; Microstrip line inductance 105 is the inductance with the microstrip line equivalence; With 4 microstrip line inductance difference called after L1, L2, L3, L4, microstrip line inductance L 1, L2, L3, L4 are the helical form microstrip line that is printed on the insulated substrate 101.Below be that example describes with microstrip line inductance L 1, microstrip line is printed on the PCB by counter clockwise direction coiled square spiral shape, microstrip line has at interval to each other.In other embodiment of the utility model, microstrip line also can be according to clockwise printing, and is not limited to squarely, also can be circular, triangle or other polygons.The length difference of each section S1 of microstrip line, S2, S3, S4, S5 and width is identical, as shown in Figure 1, l1, l2; L3, l4 are respectively the length of microstrip line, L11, L12.L13; L14 and W10, W11, W12, W13 are respectively the various piece length and the width of helical coil.
In other embodiment of the utility model; The length of each section S1, S2, S3, S4, S5 and width also can be different; Interval S between each pitch of the laps can be the same or different, and the parameters such as spacing between the line length of microstrip line, live width, pitch of the laps number and the every circle have determined the inductance value size jointly.Because the maturation of PCB technology, these parameters can accurately be controlled, thereby have guaranteed the accurately controlled of each inductance value.For other inductance L 2, L3 and L4, can be designed to equally fully with L1, also can be designed to certain difference, these are all within the scope of the utility model.
The actual emulation design sketch of the high pass filter 100 that Fig. 3 provides for the utility model embodiment.Visible by Fig. 3, the amplitude fading at cut-off frequency 3GHz place is about 2dB (cut-off frequency is decay 3dB place in theory), has realized having the comparatively characteristic high pass filter of ideal frequency, superior performance.
Fig. 4 is the structure chart of a kind of high pass filter of providing of the utility model embodiment; As shown in Figure 4; High pass filter comprises microstrip line inductance L 1, L2, L3, L4; Be that with high pass filter 100 differences shown in Figure 1 capacitor C 1 in the high pass filter among Fig. 4, C2, C3, C4 are not microstrip line electric capacity.
The high pass filter that the utility model embodiment provides uses the spiral microstrip line of high impedance to substitute inductor as reactance component, and adopts the mode of cascade to realize high-pass filtering.Make the inductance value of high pass filter accurately controlled, and reach beneficial effects such as volume is little, in light weight, bandwidth, reliability height, low cost of manufacture, and be easy to be integrated in the microwave circuit.
The utility model relates generally to and a kind ofly substitutes inductance with the helix microstrip line and realize the filter of high-pass filtering and the application in spectrum analyzer thereof.
The technical scheme that the utility model adopts can be brought significant effect.
The first, microstrip line is directly printed when the PCB fabric swatch and is formed, and the processing technology that PCB is ripe has guaranteed the pinpoint accuracy of inductance value, guarantees that filter reaches required performance.
The second, this microstripline filter can reach comparatively desirable frequency characteristics, and service band is wide, reliability is high, can effectively transmit high-frequency signal.
The 3rd, use microstrip line construction to be of value to characteristic impedance design to PCB.
The 4th, the simplicity of design of microstripline filter, microstrip line is directly printed when the PCB fabric swatch and is formed, and almost is zero cost, thereby reduces the design cost of microwave circuit greatly.
The 5th, the physical dimension of microstrip line is little, and is in light weight, is easy to be integrated in the microwave circuit.
Above-described embodiment; Purpose, technical scheme and beneficial effect to the utility model have carried out further explain, it should be understood that the above is merely the embodiment of the utility model; And be not used in the protection range that limits the utility model; All within the spirit and principle of the utility model, any modification of being made, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (10)
1. a high pass filter is characterized in that, described high pass filter comprises:
Flat insulated substrate;
Signal input part and output are formed on the described insulated substrate;
At least one microstrip line electric capacity is formed on the described insulated substrate, and described a plurality of microstrip line electric capacity are one another in series and are connected between described input and the output;
At least one microstrip line inductance is formed on the described insulated substrate, and an end of described at least one microstrip line inductance links to each other with described at least one microstrip line electric capacity respectively, the other end ground connection of described at least one microstrip line inductance.
2. high pass filter according to claim 1 is characterized in that, described microstrip line inductance is the helical form microstrip line that is printed on described insulated substrate.
3. high pass filter according to claim 2 is characterized in that, described helical form microstrip line is circular.
4. high pass filter according to claim 2 is characterized in that, described helical form microstrip line is square.
5. high pass filter according to claim 2 is characterized in that, described helical form microstrip line is by arranged clockwise.
6. high pass filter according to claim 2 is characterized in that, described helical form microstrip line is by arranging counterclockwise.
7. high pass filter according to claim 2 is characterized in that, described helical form microstrip line has at interval to each other.
8. high pass filter according to claim 4 is characterized in that, described helical form microstrip line is made up of a plurality of microstrip line sections.
9. high pass filter according to claim 8 is characterized in that, the length and the width of described a plurality of microstrip line sections are similar and different.
10. high pass filter according to claim 1 is characterized in that, described high pass filter has 4 described microstrip line electric capacity and 4 described microstrip line inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205383172U CN202434677U (en) | 2011-12-21 | 2011-12-21 | High pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205383172U CN202434677U (en) | 2011-12-21 | 2011-12-21 | High pass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202434677U true CN202434677U (en) | 2012-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205383172U Expired - Lifetime CN202434677U (en) | 2011-12-21 | 2011-12-21 | High pass filter |
Country Status (1)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595364A (en) * | 2013-10-31 | 2014-02-19 | 中国电子科技集团公司第四十一研究所 | Accurate distribution parameter microstrip high-pass filter |
| CN107425238A (en) * | 2017-09-07 | 2017-12-01 | 广东工业大学 | A kind of lc circuit structure |
| CN108183293A (en) * | 2017-12-11 | 2018-06-19 | 南京理工大学 | Plane micro-strip duplexer |
| CN110391790A (en) * | 2019-07-01 | 2019-10-29 | 普联技术有限公司 | A kind of absorption high-pass filter |
| WO2024060900A1 (en) * | 2022-01-17 | 2024-03-28 | 深圳市晶准通信技术有限公司 | Impedance transformation network, radio frequency switch unit, single-pole multi-throw radio frequency switch, and chip |
-
2011
- 2011-12-21 CN CN2011205383172U patent/CN202434677U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595364A (en) * | 2013-10-31 | 2014-02-19 | 中国电子科技集团公司第四十一研究所 | Accurate distribution parameter microstrip high-pass filter |
| CN107425238A (en) * | 2017-09-07 | 2017-12-01 | 广东工业大学 | A kind of lc circuit structure |
| CN108183293A (en) * | 2017-12-11 | 2018-06-19 | 南京理工大学 | Plane micro-strip duplexer |
| CN110391790A (en) * | 2019-07-01 | 2019-10-29 | 普联技术有限公司 | A kind of absorption high-pass filter |
| WO2024060900A1 (en) * | 2022-01-17 | 2024-03-28 | 深圳市晶准通信技术有限公司 | Impedance transformation network, radio frequency switch unit, single-pole multi-throw radio frequency switch, and chip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120912 |