CN204651444U - A kind of quantum coupling filter of Frequency Adjustable - Google Patents
A kind of quantum coupling filter of Frequency Adjustable Download PDFInfo
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- CN204651444U CN204651444U CN201520251649.0U CN201520251649U CN204651444U CN 204651444 U CN204651444 U CN 204651444U CN 201520251649 U CN201520251649 U CN 201520251649U CN 204651444 U CN204651444 U CN 204651444U
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- microstrip line
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- capacitance diode
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Abstract
The utility model discloses a kind of quantum coupling filter of Frequency Adjustable, comprising: first order filter structure, second level filter structure and isolator; First order filter structure comprises the first microstrip line and the first variable capacitance diode, first microstrip line is signal input part, first microstrip line is connected with the negative pole of the first variable capacitance diode, the plus earth of the first variable capacitance diode, and the negative pole of the first variable capacitance diode connects External Control Voltage source; Second level filter structure comprises the second microstrip line and the second variable capacitance diode, second microstrip line is signal output part, second microstrip line is connected with the negative pole of the second variable capacitance diode, the plus earth of the second variable capacitance diode, and the negative pole of the second variable capacitance diode connects External Control Voltage source; Isolator is positioned in the middle of first order filter structure and second level filter structure, and isolator comprises the 3rd microstrip line.First microstrip line, the second microstrip line and the 3rd microstrip line are all provided with the through hole of preset number.Reduce the volume of filter and simplify its structure.
Description
Technical field
The utility model relates to wireless communication field, particularly relates to a kind of quantum coupling filter of Frequency Adjustable.
Background technology
In society, the wireless communication system such as satellite navigation and wireless telecommunications has become a requisite part in people's life.In a wireless communication system, be that transmitter or receiver all need high performance filter, the quality of performance of filter even can produce the performance of overall communication system and greatly affect.
Traditional filter is generally dielectric filter, and what dielectric filter made employing is ceramic material, must make surface mount elements, volume is all often Centimeter Level, and due to the restriction of technique, its clear size of opening is larger, cause resonant cavity volume excessive, be unfavorable for miniaturized application; In addition, traditional dielectric filter input and output all need the transmission line through one section of impedance transformation, and this makes filter construction become very complicated, and can cause certain signal attenuation.
Thus, how reducing the volume of filter, and make the structure of filter more simple, is the current technical issues that need to address of those skilled in the art.
Utility model content
The purpose of this utility model is to provide a kind of quantum coupling filter of Frequency Adjustable, can reduce the volume of filter, makes the structure of filter more simple, and achieves the intellectuality of filter.
For solving the problems of the technologies described above, the utility model provides following technical scheme:
A quantum coupling filter for Frequency Adjustable, comprising: first order filter structure, second level filter structure and isolator;
Wherein, described first order filter structure comprises: the first microstrip line and the first variable capacitance diode, described first microstrip line is signal input part, described first microstrip line is provided with the through hole of preset number, described first microstrip line is connected with the negative pole of described first variable capacitance diode, the plus earth of described first variable capacitance diode, the negative pole of described first variable capacitance diode connects External Control Voltage source;
Described second level filter structure comprises: the second microstrip line and the second variable capacitance diode, described second microstrip line is signal output part, described second microstrip line is provided with the through hole of preset number, described second microstrip line is connected with the negative pole of described second variable capacitance diode, the plus earth of described second variable capacitance diode, the negative pole of described second variable capacitance diode connects External Control Voltage source;
Described isolator is positioned in the middle of described first order filter structure and second level filter structure, and described isolator comprises: the 3rd microstrip line, and described 3rd microstrip line is provided with the through hole of preset number.
Preferably, described first microstrip line is 50 ohm microstrip.
Preferably, described second microstrip line is 50 ohm microstrip.
Preferably, also comprise: the 3rd capacitor between described first microstrip line and the first variable capacitance diode; The 4th capacitor between described second microstrip line and the second variable capacitance diode.
Preferably, described through hole is circular port.
Preferably, the through hole on described 3rd microstrip line is the through hole by row arrangement.
Compared with prior art, technique scheme has the following advantages:
The quantum coupling filter of a kind of Frequency Adjustable that the utility model embodiment provides, adopt the first microstrip line as signal input part, adopt the second microstrip line as signal output part, adopt with the 3rd microstrip line of through hole as isolator, because the volume of microstrip line own is little, lightweight, reliability is high, make filter of the present utility model can be directly on a printed circuit board integrated, do not need to make independent SMD components, what thus the size of through hole can be done is very little, substantially reduces the volume of filter, in filter structure, micro-strip line impedance can design according to the needs of actual conditions, therefore impedance matching can be realized, and the width of microstrip line also can design according to actual needs, easily realize impedance Control, the input of filter and output is made no longer to need the transmission line of impedance transformation, simplify the structure of filter, and be easy to the system combination with filter place, microstrip line is provided with through hole in filter structure and is equivalent to inductance, first order filter structure and second level filter structure are just equivalent to the LC resonance structure be made up of electric capacity and inductance, after signal enters filter, first the frequency-selecting of the filter structure of every one-level is passed through, by the electromagnetic wave energy in the signal after frequency-selecting with quantum form through a series of resonance, coupling and isolator are to the effect of its reflection isolation, the reflection coefficient of input is finally made to reach minimum, signal energy in frequency band can pass through filter with very little loss, wherein variable capacitance diode can regulate changing capacitance by electricity, thus change the operating frequency of filter, be convenient to realize intellectuality.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The quantum coupling filter structural representation of the Frequency Adjustable that Fig. 1 provides for a kind of embodiment of the utility model;
The quantum coupling filter structural representation of the Frequency Adjustable that Fig. 2 provides for another embodiment of the utility model.
Embodiment
Just as described in the background section, current dielectric filter must make surface mount elements, and its clear size of opening is comparatively large, and volume is comparatively large, and filter construction is complicated.
On basis based on above-mentioned research, the utility model embodiment provides a kind of quantum coupling filter of Frequency Adjustable, comprising: first order filter structure, second level filter structure and isolator; Wherein, first order filter structure comprises: the first microstrip line and the first variable capacitance diode, first microstrip line is signal input part, first microstrip line is provided with the through hole of preset number, first microstrip line is connected with the negative pole of the first variable capacitance diode, the plus earth of the first variable capacitance diode, the negative pole of the first variable capacitance diode connects External Control Voltage source; Second level filter structure comprises: the second microstrip line and the second variable capacitance diode, second microstrip line is signal output part, second microstrip line is provided with the through hole of preset number, second microstrip line is connected with the negative pole of described second variable capacitance diode, the plus earth of the second variable capacitance diode, the negative pole of the second variable capacitance diode connects External Control Voltage source; Isolator is positioned in the middle of first order filter structure and second level filter structure, and isolator comprises: the 3rd microstrip line, and the 3rd microstrip line is provided with the through hole of preset number.
The scheme that the utility model embodiment provides, reduces the volume of filter, simplifies the structure of filter, achieves the operating frequency of tunable filter, improves the intellectuality of filter.
In order to enable above-mentioned purpose of the present utility model, feature and advantage more become apparent, and are described in detail embodiment of the present utility model below in conjunction with accompanying drawing.
Set forth detail in the following description so that fully understand the utility model.But the utility model can be different from alternate manner described here to implement with multiple, those skilled in the art can when doing similar popularization without prejudice to when the utility model intension.Therefore the utility model is not by the restriction of following public embodiment.
Please refer to Fig. 1, the quantum coupling filter structural representation of the Frequency Adjustable that Fig. 1 provides for a kind of embodiment of the utility model.
In a kind of embodiment of the present utility model, the quantum coupling filter of Frequency Adjustable provided by the utility model, comprising: first order filter structure 11, second level filter structure 12 and isolator 13; Wherein, described first order filter structure 11 comprises: the first microstrip line 111 and the first variable capacitance diode 112, described first microstrip line 111 is signal input part, described first microstrip line 111 is provided with the through hole of preset number, described first microstrip line 111 is connected with the negative pole of described first variable capacitance diode 112, the plus earth of described first variable capacitance diode 112, the negative pole of described first variable capacitance diode 112 connects External Control Voltage source 10; Described second level filter structure 12 comprises: the second microstrip line 121 and the second variable capacitance diode 122, described second microstrip line 121 is signal output part, described second microstrip line 121 is provided with the through hole of preset number, described second microstrip line 121 is connected with the negative pole of described second variable capacitance diode 122, the plus earth of described second variable capacitance diode 122, the negative pole of described second variable capacitance diode 122 connects External Control Voltage source 10; Described isolator 13 is positioned in the middle of described first order filter structure 11 and second level filter structure 12, and described isolator 13 comprises: the 3rd microstrip line 131, and described 3rd microstrip line 131 is provided with the through hole of preset number.
Wherein, microstrip line refers to the microwave transmission line be made up of the plain conductor band propped up on dielectric substrate, and its volume is little, lightweight, service band is wide, reliability is high.
In the present embodiment, the quantum coupling filter main body of Frequency Adjustable is that two stage filter structure adds middle isolator, i.e. first order filter structure, second level filter structure and the isolator that is positioned in the middle of first order filter structure and second level filter structure.Every one-level filter structure is made up of a variable capacitance diode and one section of microstrip line being provided with preset number through hole, as first order filter structure is made up of the first capister and the first microstrip line, second level filter structure is made up of the second capister and the second microstrip line.The positive pole ground connection of each variable capacitance diode, negative pole connects control voltage, i.e. reverse-biased connection, and wherein, the minus earth in control voltage source, the positive pole in control voltage source is connected with the negative pole of the first variable capacitance diode and the negative pole of the second variable capacitance diode respectively.
In every one-level filter structure, microstrip line is provided with through hole and is equivalent to an inductance, namely the filter structure of every one-level is equivalent to the LC resonance structure of an electric capacity and an inductance composition, wherein, number of through-holes on first microstrip line and the second microstrip line is unfixed, design the number of the through hole on the first microstrip line and the second microstrip line according to actual needs respectively, can multiple through hole arranged side by side on same section of microstrip line, after through hole on same section of microstrip line is arranged side by side, the equivalent electric sensibility reciprocal of this microstrip line reduces, and frequency moves.Through hole arrangement is generally arranged successively from the lower end of microstrip line, and wherein, the upper end of microstrip line refers to one end that microstrip line connects corresponding capister, and the lower end of microstrip line is one end relative with the upper end of microstrip line self.
Wherein, increase the diameter of through hole and the thickness of linked hole, reduction sheet material, the inductance value of microstrip line in every one-level filter structure can be reduced, and reduce through-hole diameter and increase the inductance value that sheet metal thickness can increase microstrip line in every one-level filter structure.Relative bandwidth and the squareness factor of filter can be changed by the inductance value changing microstrip line in every one-level filter structure, when suitably reduce the first microstrip line and the second microstrip line inductance value and after ensureing that resonance frequency is constant, reduce in the relative bandwidth of identical frequency upper filter, squareness factor improves, but differential loss becomes large, therefore, different filters can be designed according to the actual requirements.
Isolator is made up of the microstrip line that a section is provided with the through hole of preset number, namely be provided with the 3rd microstrip line of through hole, wherein, the number of openings on the 3rd microstrip line is more, spacing between through hole is less, through-hole diameter is larger and the 3rd microstrip line is wider, then the degree of coupling is less, and isolation effect is better.
In the present embodiment, after signal enters filter, first the frequency-selecting of the filter structure of every one-level is passed through, by the electromagnetic wave energy after frequency-selecting with the reflection buffer action of quantum form through a series of resonance, coupling and intervening isolator, the reflection coefficient of input is finally made to reach minimum, signal energy in frequency band can pass through filter with very little loss, wherein, when reflection coefficient is transferred to minimum, therefore the loss of the loss of signal energy mainly material, if select the sheet material of good printed circuit board that differential loss can be made very little.And there is good inhibitory action to out-of-band signal, certain so-called inhibitory action is comparatively speaking, Out-of-band rejection is changed by regulating the inductance value of the first microstrip line and the second microstrip line, when the inductance value of the first microstrip line and the second microstrip line reduces, Out-of-band rejection improves, bandwidth narrows, but differential loss can be made to become large, therefore needs number and the arrangement of the through hole designed according to the actual needs on the first microstrip line and the second microstrip line.
First variable capacitance diode and the second variable capacitance diode on a printed circuit board integrated, power taking more for convenience, can regulate changing capacitance by electricity, thus change the operating frequency of filter, is convenient to realize intelligent.First microstrip line and the second microstrip line are all provided with through hole, and to replace inductance, the Q value of this structure is higher, and namely its quality factor are higher, effectively can reduce the differential loss of filter.As shown in the above, the degree of coupling of filter structure at different levels can be changed by the live width of microstrip line and the quantity of through hole regulating isolator, thus reach best S21 and S11 value, wherein, S21 refers to forward transmission coefficient, in design of filter, the absolute value of S21 is less, then the differential loss of filter is less; S11 refers to input reflection coefficient, and the absolute value of S11 is larger, then the energy reflected is fewer, and the performance of filter is better.
On the basis of above-described embodiment, the quantum filter of the Frequency Adjustable that the utility model embodiment provides, preferably described first microstrip line is 50 ohm microstrip.Also preferably described second microstrip line is 50 ohm microstrip.
At present, in the system at generally filter place, the input and output impedance of each several part is all 50 ohm, first microstrip line is input, the second microstrip line is output, first microstrip line and the second microstrip line all adopt 50 ohm microstrip, easily realize impedance matching, make the signal energy of loss minimum, be easy to and system combination.
It should be noted that, the present embodiment just preferably adopts 50 ohm microstrip as signal input part and output, specifically depends on the circumstances, does not limit this.
Please refer to Fig. 2, the quantum coupling filter structural representation of the Frequency Adjustable that Fig. 2 provides for another embodiment of the utility model.
On the basis of above-mentioned first embodiment, the quantum filter of the Frequency Adjustable that the utility model embodiment provides, preferably also comprises: the 3rd capacitor 113 between described first microstrip line 111 and the first variable capacitance diode 112; The 4th capacitor 123 between described second microstrip line 121 and the second variable capacitance diode 122.
3rd capacitor is capacitance, when External Control Voltage source is direct-current control voltage source, prevent the short circuit of External Control Voltage source, to guarantee that direct voltage is added in the negative pole of the first variable capacitance diode, and the 3rd capacitor value should get higher value, to reduce the impact on the first variable capacitance diode, ensure that the first variable capacitance diode can normally work, now, the electric capacity of first order filter structure is actually the first variable capacitance diode and the equivalent electric capacity of the 3rd capacitor series connection, therefore, in order to prevent the remarkable reduction of first order filter structure capacitance adjustable extent, the capacitance of the 3rd capacitor should be tried one's best greatly.
4th capacitor is also capacitance, when External Control Voltage source is direct-current control voltage source, prevent the short circuit of External Control Voltage source, to guarantee that direct voltage is added in the negative pole of the second variable capacitance diode, and the 4th capacitor value should get higher value, to reduce the impact on the second variable capacitance diode, ensure that the second variable capacitance diode can normally work, now, the electric capacity of second level filter structure is actually the second variable capacitance diode and the equivalent electric capacity of the 4th capacitor series connection, therefore, in order to prevent the remarkable reduction of second level filter structure capacitance adjustable extent, the capacitance of the 4th capacitor should be tried one's best greatly.
In the utility model embodiment, described through hole is circular port.
In the present embodiment, the through hole that the through hole that the through hole the first microstrip line arranged, the second microstrip line are arranged and the 3rd microstrip line are arranged all is preferably circular port.Its advantage is, circular port is convenient to produce, and makes differential loss be less than the through hole of other shapes.
In the utility model embodiment, the quantum coupling filter of the Frequency Adjustable provided, the through hole preferably on described 3rd microstrip line is the through hole by row arrangement.Through hole on 3rd microstrip line is convenient to produce by row arrangement.
In sum, the quantum coupling filter of the Frequency Adjustable that the utility model embodiment provides, adopt the first microstrip line as signal input part, adopt the second microstrip line as signal output part, adopt with the 3rd microstrip line of through hole as isolator, because the volume of microstrip line own is little, lightweight, reliability is high, make filter of the present utility model can be directly on a printed circuit board integrated, do not need to make independent SMD components, what thus the size of through hole can be done is very little, substantially reduces the volume of filter, in filter structure, micro-strip line impedance can design according to the needs of actual conditions, therefore impedance matching can be realized, and the width of microstrip line also can design according to actual needs, easily realize impedance Control, the input of filter and output is made no longer to need the transmission line of impedance transformation, simplify the structure of filter, and be easy to the system combination with filter place, microstrip line is provided with through hole in filter structure and is equivalent to inductance, first order filter structure and second level filter structure are just equivalent to the LC resonance structure be made up of electric capacity and inductance, after signal enters filter, first the frequency-selecting of the filter structure of every one-level is passed through, by the electromagnetic wave energy in the signal after frequency-selecting with quantum form through a series of resonance, coupling and isolator are to the effect of its reflection isolation, the reflection coefficient of input is finally made to reach minimum, signal energy in frequency band can pass through filter with very little loss, wherein variable capacitance diode can regulate changing capacitance by electricity, thus change the operating frequency of filter, be convenient to realize intellectuality, there is insertion loss little, narrow bandwidth, Out-of-band rejection is good, the advantages such as power capacity is large, due to can be directly on a printed circuit board integrated, be conducive to miniaturized application.
Above the quantum coupling filter of a kind of Frequency Adjustable provided by the utility model is described in detail.Apply specific case herein to set forth principle of the present utility model and execution mode, the explanation of above embodiment just understands the utility model and core concept thereof for helping.Should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model principle, can also carry out some improvement and modification to the utility model, these improve and modify and also fall in the protection range of the utility model claim.
Claims (6)
1. a quantum coupling filter for Frequency Adjustable, is characterized in that, comprising: first order filter structure, second level filter structure and isolator;
Wherein, described first order filter structure comprises: the first microstrip line and the first variable capacitance diode, described first microstrip line is signal input part, described first microstrip line is provided with the through hole of preset number, described first microstrip line is connected with the negative pole of described first variable capacitance diode, the plus earth of described first variable capacitance diode, the negative pole of described first variable capacitance diode connects External Control Voltage source;
Described second level filter structure comprises: the second microstrip line and the second variable capacitance diode, described second microstrip line is signal output part, described second microstrip line is provided with the through hole of preset number, described second microstrip line is connected with the negative pole of described second variable capacitance diode, the plus earth of described second variable capacitance diode, the negative pole of described second variable capacitance diode connects External Control Voltage source;
Described isolator is positioned in the middle of described first order filter structure and second level filter structure, and described isolator comprises: the 3rd microstrip line, and described 3rd microstrip line is provided with the through hole of preset number.
2. filter according to claim 1, is characterized in that, described first microstrip line is 50 ohm microstrip.
3. filter according to claim 2, is characterized in that, described second microstrip line is 50 ohm microstrip.
4. the filter according to claim 1 or 3, is characterized in that, also comprises:
The 3rd capacitor between described first microstrip line and the first variable capacitance diode;
The 4th capacitor between described second microstrip line and the second variable capacitance diode.
5. filter according to claim 4, is characterized in that, described through hole is circular port.
6. filter according to claim 5, is characterized in that, the through hole on described 3rd microstrip line is the through hole by row arrangement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520251649.0U CN204651444U (en) | 2015-04-23 | 2015-04-23 | A kind of quantum coupling filter of Frequency Adjustable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520251649.0U CN204651444U (en) | 2015-04-23 | 2015-04-23 | A kind of quantum coupling filter of Frequency Adjustable |
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| CN204651444U true CN204651444U (en) | 2015-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520251649.0U Withdrawn - After Issue CN204651444U (en) | 2015-04-23 | 2015-04-23 | A kind of quantum coupling filter of Frequency Adjustable |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767017A (en) * | 2015-04-23 | 2015-07-08 | 苏州英诺迅科技股份有限公司 | Frequency adjustable quantum coupling filter |
| CN113193311A (en) * | 2021-04-30 | 2021-07-30 | 清华大学 | Superconducting quantum control multiplexing microwave device and superconducting quantum test system |
-
2015
- 2015-04-23 CN CN201520251649.0U patent/CN204651444U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767017A (en) * | 2015-04-23 | 2015-07-08 | 苏州英诺迅科技股份有限公司 | Frequency adjustable quantum coupling filter |
| CN104767017B (en) * | 2015-04-23 | 2018-02-16 | 苏州英诺迅科技股份有限公司 | A kind of quantum coupling filter of Frequency Adjustable |
| CN113193311A (en) * | 2021-04-30 | 2021-07-30 | 清华大学 | Superconducting quantum control multiplexing microwave device and superconducting quantum test system |
| CN113193311B (en) * | 2021-04-30 | 2022-04-22 | 清华大学 | Superconducting quantum control multiplexing microwave device and superconducting quantum test system |
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Granted publication date: 20150916 Effective date of abandoning: 20180216 |