CN103904393B - A kind of filter and electronic equipment - Google Patents
A kind of filter and electronic equipment Download PDFInfo
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- CN103904393B CN103904393B CN201210587705.9A CN201210587705A CN103904393B CN 103904393 B CN103904393 B CN 103904393B CN 201210587705 A CN201210587705 A CN 201210587705A CN 103904393 B CN103904393 B CN 103904393B
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- microstrip line
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- filter
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Abstract
This application discloses a kind of filter and electronic equipment, wherein, include noise signal in the signal to be output of described electronic equipment, include harmonic signal in described noise signal, described device includes: filter unit, has an input port；Electric capacity microstrip line, have in blocking signal DC component by based on calculated first capacitance of described harmonic signal；Inductance microstrip line, have in blocking signal AC compounent by based on calculated first inductance value of described harmonic signal；Connect microstrip line, have by based on calculated first resistance value of described harmonic signal；Wherein, described filter unit is connected with described electric capacity microstrip line and described inductance microstrip line by described connection microstrip line, when inputting described signal to be output via described input port, through described filter, described signal to be output is processed, so that described noise signal is filtered, and exported by described electric capacity microstrip line or described inductance microstrip line.
Description
Technical field
The application relates to electronic technology field, particularly to a kind of filter and electronic equipment.
Background technology
Wave filter is a kind of device having process effect to signal or circuit, and it can allow useful signal as far as possible
Zero-decrement passing through, the decay the biggest to garbage signal, to filter out garbage signal.Such as, sound table
Wave filter is the piezoelectric property by piezoelectric, to reach to filter unnecessary signal and noise.Although sound
Table wave filter has the most precipitous filter curve, but it is the most inadequate for the reduction degree of harmonic wave so that harmonic wave merit
Rate is relatively big, thus disturbs communication.
In prior art, generally utilize the LPF electricity made between power amplifier and wave filter as shown in Figure 1
Road, and then filter harmonic components.During utilizing low-pass filter circuit and wave filter to be filtered, logical
Often needing to carry out matching test and stress_responsive genes, wherein, matching test is narrowband test, is to LPF
The process that electric capacity in circuit and the size of inductance are adjusted, stress_responsive genes is broadband test, be for
Join the different electric capacity obtained in test and the measurement of different-effect that signal filtering is reached by inductance value.
The present inventor, during realizing the embodiment of the present application technical scheme, at least finds to deposit in prior art
In following technical problem:
Owing to low-pass filter circuit and wave filter are separate two devices, capacitance and inductance value are being carried out
During regulation, for different capacitances and inductance value, need to carry out broadband test, and this test process is the most multiple
Miscellaneous, need accurate test system, and this test system is sufficiently expensive, is under general condition difficult to possess this
Planting test system, so prior art exists needs to carry out broadband test, and test process is complicated and difficult
Technical problem；
Also, due in broadband test, for reaching good filter effect, exist owing to needs spend a large amount of
R&D cycle and the technical problem of inefficiency that causes；
Separately, owing to low-pass filter circuit and wave filter are separate two devices, there is the skill that integrated level is the highest
Art problem.
Summary of the invention
The embodiment of the present invention provides a kind of filter and electronic equipment, is used for solving in prior art due to low
Bandpass filter circuit and wave filter are separate two devices, exist and need to carry out broadband test, and test process
Complicated and difficult technical problem, it is achieved that low-pass filter circuit and wave filter are integrated into a device, from
Technique effect without broadband test.
A kind of filter, in electronic equipment, wherein, wraps in the signal to be output of described electronic equipment
Containing noise signal, comprising harmonic signal in described noise signal, described device includes:
Filter unit, has an input port；
Electric capacity microstrip line, has based on calculated first capacitance of described harmonic signal, and described electric capacity is micro-
With line DC component in blocking signal；
Inductance microstrip line, has based on calculated first inductance value of described harmonic signal, and described inductance is micro-
With line AC compounent in blocking signal；
Connect microstrip line, have based on calculated first resistance value of described harmonic signal；
Wherein, described filter unit is micro-with described electric capacity microstrip line and described inductance by described connection microstrip line
Band line connects, when inputting described signal to be output via described input port, through described filter pair
Described signal to be output processes, so that described noise signal is filtered, and by described electric capacity microstrip line or
Described inductance microstrip line exports.
Further, when described harmonic signal has first frequency value, described first capacitance is specially base
Corresponding relation between described first frequency value and frequency values and capacitance and the capacitance that obtains.
Further, when described harmonic signal has first frequency value, described first inductance value is specially base
Corresponding relation between described first frequency value and frequency values and inductance value and the inductance value that obtains.
Further, described electric capacity microstrip line has the first shape, and wherein, described first shape is specially base
Corresponding relation between described first capacitance and capacitance and microstrip line shape and the micro-strip that obtains is linear
Shape.
Further, described inductance microstrip line has the second shape, and wherein, described second shape is specially base
In described first inductance value, and corresponding relation between inductance value and microstrip line shape and the micro-strip that obtains is linear
Shape.
Further, described inductance microstrip line is connected with preset rules symmetry with described electric capacity microstrip line.
Further, described filter unit also includes an output port, and wherein, described filter unit passes through institute
State output port to connect with the described microstrip line that is connected.
A kind of electronic equipment, described electronic equipment includes:
Casing；
Circuit board, is arranged in described casing；
Filter, is arranged on described circuit board.
The one or more technical schemes provided in the embodiment of the present application, at least have the following technical effect that or excellent
Point:
In the embodiment of the present invention, by low pass circuit being integrated in filter unit with microstrip line form, no longer
Need to change capacitance and inductance value, solve in prior art owing to low-pass filter circuit and wave filter are point
Two devices opened, exist and need to carry out broadband test, and the technical problem that test process is complicated and difficult,
Achieve and low-pass filter circuit and wave filter are integrated into a device, from the technology without broadband test
Effect；
And then, owing to need not broadband test, solve and exist owing to needs spend a large amount of R&D cycle to lead
The technical problem of the inefficiency caused, it is achieved that improve the technique effect of efficiency owing to reducing the R&D cycle；
And then, owing to low-pass filter circuit and wave filter to be integrated into a device, solve integrated level the highest
Technical problem, it is achieved that improve filter integrated level technique effect.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of low-pass filter circuit in prior art；
Fig. 2 is the structure chart of filter in one embodiment of the invention；
Fig. 3 is to connect microstrip line 204 and electric capacity microstrip line 202 and inductance microstrip line in one embodiment of the invention
The connection diagram of 203.
Detailed description of the invention
The embodiment of the present invention provides a kind of filter and electronic equipment, is used for solving in prior art due to low
Bandpass filter circuit and wave filter are separate two devices, exist and need to carry out broadband test, and test process
Complicated and difficult technical problem, it is achieved that low-pass filter circuit and wave filter are integrated into a device, from
Technique effect without broadband test.
Technical scheme in the embodiment of the present application is for solving the problems referred to above, and general thought is as follows:
By filter unit, there is an input port；Electric capacity microstrip line, has and exchanges in blocking signal
Component by based on calculated first capacitance of described harmonic signal；Inductance microstrip line, has for hindering
DC component by based on calculated first inductance value of described harmonic signal in signal；Connect microstrip line,
Have by based on calculated first resistance value of described harmonic signal；Wherein, described filter unit passes through institute
State connection microstrip line to be connected with described electric capacity microstrip line and described inductance microstrip line, when via described input port
When inputting described signal to be output, through described filter, described signal to be output is processed, to incite somebody to action
Described noise signal filters, and is exported by described electric capacity microstrip line or described inductance microstrip line, solves
Prior art is separate two devices due to low-pass filter circuit and wave filter, there are needs and carry out width
Tape test, and the technical problem that test process is complicated and difficult.
In order to be better understood from technique scheme, below in conjunction with Figure of description and concrete embodiment party
Technique scheme is described in detail by formula.
The present invention provides a kind of filter, in electronic equipment, the signal to be output of described electronic equipment
In include noise signal, described noise signal includes harmonic signal, and wherein, described electronic equipment is permissible
There is the electronic equipment receiving and sending semiotic function for mobile phone, base station etc..When described electronic equipment is mobile phone
Time, mobile phone to Base Transmitter signal to communicate time, launching signal for WCDMA frequency range VIII be
Example, the frequency range of described transmitting signal is 880-915MHz, usually 902.4MHz.At emission process
In, described signal can produce the harmonic signal of 902.4 × N (N is integer) MHz.
As a example by filter is arranged in mobile phone, such scheme will be described in detail below.
Seeing Fig. 2, described device includes:
Filter unit 201, has an input port, needs the signal to be output being filtered by described input
Port is input in filter, so that it can be filtered by described filter.
In the application implementation process, described filter unit 201 can be SAW filter, defeated when treating
Go out the transmitting signal of the i.e. mobile phone of signal, after described SAW filter, can be filtered some spuious
Component.Wherein, described SAW filter, i.e. SAWF, be utilize have piezo-electric effect quartz,
Lithium niobate, barium titanate crystal are made, when the described crystal with piezo-electric effect is acted on by the signal of telecommunication,
Can produce elastic deformation and send sound wave, the signal of telecommunication can be transferred to acoustical signal, this sound wave is only at crystal table
Face is propagated.The frequency response of described SAW filter is smooth, and squareness factor is good, has selecting frequency characteristic,
After shape, spacing, intersection length and the motor number of interdigital transducers electrodes are reasonably designed,
Can obtain close to preferable intermediate frequency amplitude versus frequency characte, and SAW filter has, and volume is little, lightweight, property
Energy is reliable, need not the advantage of complicated adjustment, so in implementation process, generally employing surface acoustic wave filtering
Device.But being not limited only to use SAW filter, those of ordinary skill in the art can also use duplexer
Deng other devices with filter function, the spurious components in band output signal is filtered.
In the embodiment of the present application, described device also includes:
Electric capacity microstrip line 202, has being calculated by based on described harmonic signal of in blocking signal DC component
The first capacitance obtained；
Inductance microstrip line 203, has being calculated by based on described harmonic signal of in blocking signal AC compounent
The first inductance value obtained；
Connect microstrip line 204, have by based on calculated first resistance value of described harmonic signal.
Wherein, when described harmonic signal has first frequency value, described first capacitance is specially based on institute
The capacitance stating the corresponding relation between first frequency value and frequency values and capacitance and obtain；
When described harmonic signal has first frequency value, described first inductance value is specially based on described first
Corresponding relation between frequency values and frequency values and inductance value and the inductance value that obtains.
In specific implementation process, when the frequency launching signal is 902.4MHz, signal is through power amplifier
Amplification process can produce and include that each frequency of more than second harmonic that frequency is 1804.8MHz and secondary is humorous
Ripple, the embodiment of the present application is during filtering harmonic signal, mainly for second harmonic, in filter
While second harmonic, nature can filter out each frequency harmonics of more than secondary.
According to formulaThe of electric capacity microstrip line can be obtained by first frequency value f of second harmonic
One capacitance L and the first inductance value C of inductance microstrip line, wherein, it is general that L is generally less than 10nh, C
Less than 20pf, after the first inductance value and the second inductance value are left enough surpluses, finally give inductance
First inductance value of microstrip line is 4.7nh, and the first capacitance of electric capacity microstrip line is 2.2pf.
Further, in the embodiment of the present application, described electric capacity microstrip line has the first shape, wherein, institute
State the first shape to be specially based on the corresponding pass between described first capacitance and capacitance with microstrip line shape
The microstrip line shape being and obtain；
Described inductance microstrip line has the second shape, and wherein, described two shapes are specially based on described first electricity
Corresponding relation between inductance value, and inductance value and microstrip line shape and the microstrip line shape that obtains.
And, described electric capacity microstrip line is connected with preset rules symmetry with described inductance microstrip line.
In specific implementation process, microstrip line comprises substrate, and is printed on medium substrate one by design shape
The conductor tape in face and the metal ground plate of another side.In the application, selecting as a example by fr-4 by substrate, it is situated between
Matter constant is 4.6, and thickness is 20mil, after obtaining the first capacitance and the first inductance value, first, and root
According to formulaAnd XL=2 Ω fL, obtain the first capacitive reactance of corresponding first capacitance and corresponding first electricity
First induction reactance of inductance value, then, if electric capacity microstrip line substrate dielectric uses the microstrip line of 30 Ω, then passes through
It is 75mil that microstrip line calculation procedure can obtain the width of electric capacity microstrip line, if to inductance microstrip line substrate dielectric
Use the microstrip line of 100 Ω, then can obtain the width of inductance microstrip line by microstrip line calculation procedure is
31.5mil, finally, according to formulaAndObtain
The a length of 315mil of electric capacity microstrip line, a length of 276mil of inductance microstrip line.In practice, Ke Yitong
Crossing the substrate using high dielectric constant to reduce the area occupied of microstrip line, generally using dielectric constant is 10
Medium, the length of microstrip line can reduce by 30%, it is also possible to by changing electric capacity microstrip line and inductance microstrip line
Resistance value seek suitable length.It addition, the big portion of shape of described electric capacity microstrip line and inductance microstrip line
It is divided into rectangle, it is also possible to make sector, impedance can be made gradual if microstrip line is made sector.It addition,
As it is shown on figure 3, the connected mode of optimum is described electric capacity microstrip line and described inductance microstrip line vertical connection,
The minor face of described electric capacity microstrip line is positioned at the centre position on the long limit of described inductance microstrip line, or described inductance is micro-
Minor face with line is positioned at the centre position on the long limit of described electric capacity microstrip line, so that inductance microstrip line and electricity
Hold the connected symmetrical dendrimer of microstrip line, it is ensured that the capacitance of electric capacity microstrip line and the inductance value of inductance microstrip line are accurate,
Connect microstrip line can with described electric capacity microstrip line arbitrarily while being connected, it is also possible to described inductance microstrip line
Arbitrarily on one side connection.
Further, in the embodiment of the present application, described filter unit also includes an output port, wherein,
Described filter unit is connected with the described microstrip line that is connected by described output port.
In specific implementation process, connection microstrip line generally uses and uses 75 Ω under 50 Ω, a few cases, partially
Difference is in positive and negative 5%, and filter unit is connected with the described microstrip line that is connected by output port, described connection
Described filter unit is connected again by microstrip line with inductance microstrip line and electric capacity microstrip line.When via filter
When input port inputs signal to be output, described filter utilizes filter unit to filter spurious components, utilizes
Electric capacity microstrip line and inductance microstrip line filter harmonic signal, and the signal of filtering clutter passes through electric capacity micro-strip the most at last
Line or inductance microstrip line export.
Based on same design, the application one embodiment provides a kind of electronic equipment, and described electronic equipment includes:
Casing；
Circuit board, is arranged in described casing；
Filter, as in figure 2 it is shown, be arranged on described circuit board；Described circuit board and filter are equal
It is positioned in housing.
The one or more technical schemes provided in the embodiment of the present application, at least have the following technical effect that or excellent
Point:
In the embodiment of the present invention, by low pass circuit being integrated in filter unit with microstrip line form, no longer
Need to change capacitance and inductance value, solve in prior art owing to low-pass filter circuit and wave filter are point
Two devices opened, prior art exists needs to carry out broadband test, and the skill that test process is complicated and difficult
Art problem, it is achieved that low-pass filter circuit and wave filter are integrated into a device, surveys from without broadband
The technique effect of examination；
And then, owing to need not broadband test, solve and exist owing to needs spend a large amount of R&D cycle to lead
The technical problem of the inefficiency caused, it is achieved that improve the technique effect of efficiency owing to reducing the R&D cycle；
And then, owing to low-pass filter circuit and wave filter to be integrated into a device, solve integrated level the highest
Technical problem, it is achieved that improve filter integrated level technique effect.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (8)
1. a filter, in electronic equipment, wherein, in the signal to be output of described electronic equipment
Include noise signal, described noise signal includes harmonic signal, it is characterised in that described device bag
Include:
Filter unit, has an input port；
Electric capacity microstrip line, has based on calculated first capacitance of described harmonic signal, and described electric capacity is micro-
With line DC component in blocking signal；
Inductance microstrip line, has based on calculated first inductance value of described harmonic signal, and described inductance is micro-
With line AC compounent in blocking signal；
Connect microstrip line, have based on calculated first resistance value of described harmonic signal；
Wherein, described filter unit is micro-with described electric capacity microstrip line and described inductance by described connection microstrip line
Band line connects, when inputting described signal to be output via described input port, through described filter pair
Described signal to be output processes, so that described noise signal is filtered, and by described electric capacity microstrip line or
Described inductance microstrip line exports.
2. device as claimed in claim 1, it is characterised in that when described harmonic signal has first frequency
During value, described first capacitance is specially based between described first frequency value and frequency values and capacitance
Corresponding relation and the capacitance that obtains.
3. device as claimed in claim 1, it is characterised in that when described harmonic signal has first frequency
During value, described first inductance value is specially based between described first frequency value and frequency values and inductance value
Corresponding relation and the inductance value that obtains.
4. device as claimed in claim 1, it is characterised in that described electric capacity microstrip line has the first shape,
Wherein, described first shape is specially based between described first capacitance and capacitance and microstrip line shape
Corresponding relation and the microstrip line shape that obtains.
5. device as claimed in claim 1, it is characterised in that described inductance microstrip line has the second shape,
Wherein, described second shape is specially based on described first inductance value, and between inductance value and microstrip line shape
Corresponding relation and the microstrip line shape that obtains.
6. device as claimed in claim 1, it is characterised in that described inductance microstrip line is micro-with described electric capacity
Band line connects with preset rules symmetry.
7. the device as described in claim arbitrary in claim 1-6, it is characterised in that described filter unit is also
Including an output port, wherein, described filter unit is connected microstrip line even by described output port with described
Connect.
8. an electronic equipment, it is characterised in that described electronic equipment includes:
Casing；
Circuit board, is arranged in described casing；
Filter, is arranged on described circuit board, and wherein, described filter is specially such as claim
Filter described in arbitrary claim in 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210587705.9A CN103904393B (en) | 2012-12-28 | 2012-12-28 | A kind of filter and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210587705.9A CN103904393B (en) | 2012-12-28 | 2012-12-28 | A kind of filter and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN103904393A CN103904393A (en) | 2014-07-02 |
| CN103904393B true CN103904393B (en) | 2016-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210587705.9A Active CN103904393B (en) | 2012-12-28 | 2012-12-28 | A kind of filter and electronic equipment |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201319586Y (en) * | 2008-10-31 | 2009-09-30 | 鸿富锦精密工业（深圳）有限公司 | Low-pass filter |
| CN101933343A (en) * | 2007-11-29 | 2010-12-29 | 海恩施创新公司 | An electrostatic speaker system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3875458B2 (en) * | 2000-06-30 | 2007-01-31 | 株式会社東芝 | Transmitter / receiver integrated high-frequency device |
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2012
- 2012-12-28 CN CN201210587705.9A patent/CN103904393B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101933343A (en) * | 2007-11-29 | 2010-12-29 | 海恩施创新公司 | An electrostatic speaker system |
| CN201319586Y (en) * | 2008-10-31 | 2009-09-30 | 鸿富锦精密工业（深圳）有限公司 | Low-pass filter |
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| CN103904393A (en) | 2014-07-02 |
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