CN114257213B - Adjustable band-pass tuning frequency-selecting circuit, electrically tunable filter and adjusting method thereof - Google Patents
Adjustable band-pass tuning frequency-selecting circuit, electrically tunable filter and adjusting method thereof Download PDFInfo
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- CN114257213B CN114257213B CN202111496307.1A CN202111496307A CN114257213B CN 114257213 B CN114257213 B CN 114257213B CN 202111496307 A CN202111496307 A CN 202111496307A CN 114257213 B CN114257213 B CN 114257213B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0153—Electrical filters; Controlling thereof
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses an adjustable band-pass tuning frequency-selecting circuit, an electric tuning filter and an adjusting method thereof, which relate to the technical field of microwave communication and solve the technical problems of large volume and complex structure of the existing circuit, wherein the adjustable band-pass tuning frequency-selecting circuit comprises two resonant circuits which are cascaded in a symmetrical distribution mode, the resonant circuits comprise three inductors and a group of varactors, one of the inductors is grounded through the varactors, and the input end of the varactors is connected with control voltage; the inductances of the two resonant circuits are coupled to each other via a varactor diode to ground. The invention has the advantages of simple integral structure, easy processing, small volume, low cost and debugging function: the coupling coefficient can be adjusted by adjusting the distance of the coupling inductor, so that bandwidth adjustment is completed, adjustment convenience is improved, and debugging difficulty is reduced; the center frequency can be adjusted by changing the inductance values of the inductor L3 and the inductor L4; the in-band insertion loss and standing wave can be adjusted by changing the inductance L2 and the inductance L5.
Description
Technical Field
The invention relates to the technical field of microwave communication, in particular to the technical field of an adjustable band-pass tuning frequency selecting circuit, an electrically tunable filter and an adjusting method thereof.
Background
Under increasingly crowded spectrum resources and complex electromagnetic environments, high-performance filters are gaining continuous attention and research by researchers as an effective means of improving this situation. The traditional broadband communication system adopts the front end of the radio frequency system formed by a multipath filter and a radio frequency switch as an anti-interference technical means. The method has the problems of large volume, wide passband, weak anti-interference capability, general linearity, high cost and the like. The electrically tunable filter can change the capacitance value by changing the state of the capacitor chip or changing the DC bias voltage of the varactor diode with a narrower bandwidth, and then the resonance frequency is changed to continuously scan and cover a wider frequency band. Meanwhile, the size of the electrically tunable filter can be effectively reduced, and the anti-interference capability is improved. Thus, the electrically tunable filter is a filter excellent in the current performance.
The electrically tunable filter is a novel radio frequency band-pass filter, and is an indispensable key device in modern digital communication and frequency hopping technology. Conventional electrically tunable filters are all circuit models designed based on chebyshev or resonant coupling theory. The chebyshev filter and the elliptic filter have advantages and disadvantages respectively: the chebyshev filter suppresses out-of-band, but the filtering performance is not as good as that of an elliptic filter; elliptical filters are not widely used in electrically tunable filtering due to their narrow tuning range. Meanwhile, the electrically tunable filter generally uses LC or microstrip technology to implement a circuit. The LC circuit requires a plurality of capacitors, and the LC circuit needs to be tuned by selecting the number of capacitors through a switch, so that the electrically tunable filter manufactured in this way is relatively large. The volume of the electrically tunable filter manufactured by the microstrip line process is greatly reduced, but the electrically tunable filter cannot be debugged in actual use, has poor applicability, long production period and high cost.
Disclosure of Invention
The invention aims at: in order to solve the technical problems, the invention provides the inductance coupling zero-following type LC electrically tunable filter which has the advantages of simple structure, small volume, high frequency selectivity and convenience in debugging.
The invention adopts the following technical scheme for realizing the purposes:
in a first aspect, the invention discloses an adjustable band-pass tuning frequency-selecting circuit, which comprises two resonant circuits cascaded in a symmetrical distribution mode, wherein one resonant circuit comprises an inductor L1, an inductor L2 and an inductor L3, one end of the inductor L1 is connected with a signal input end, the other end of the inductor L2 is connected with the other end of the inductor L1, the other end of the inductor L3 is grounded after being connected with a varactor D2 in series, and the input end of the varactor D2 is connected with a voltage V IN2 ；
The other resonant circuit comprises an inductor L6 with one end connected with the signal output end, an inductor L4 and an inductor L5 with one end connected with the other end of the inductor L6 and the other end grounded, wherein the inductor L4 is connected with a varactor diode D3 in series and then grounded, and the input end of the varactor diode D3 is connected with a control voltage V IN3 ；
The inductance L3 and the inductance L4 are coupled.
Further, the adjustable band-pass tuning frequency-selecting circuit further comprises a varactor diode D1 connected in parallel with the inductor L1, and the input end of the varactor diode D1 is connected with a voltage V IN1 。
Further, the inductor is a high Q inductor.
Further, the control voltage V IN1 And control voltage V IN2 Is the same variable voltage source.
In a second aspect, the invention discloses an adjustable electric tunable filter, in particular to an inductive coupling zero point adjustable electric tunable filter applicable to a microwave planar circuit, wherein a band-pass tuning frequency-selecting circuit of the electric tunable filter is any one of the band-pass tuning frequency-selecting circuits.
In a third aspect, the invention discloses a method for adjusting an adjustable band-pass tuning frequency-selecting circuit, which is implemented based on the following circuit: an adjustable band-pass tuning frequency-selecting circuit comprises two resonant circuits which are cascaded in a symmetrical distribution mode, wherein one resonant circuit comprises a signal input end connected with one endThe inductor L1 and the inductor L3 with one end connected with the other end of the inductor L1 and the other end grounded, the serially connected varactor diode D2 of the inductor L3 is grounded, and the input end of the varactor diode D2 is connected with the control voltage V IN2 The method comprises the steps of carrying out a first treatment on the surface of the The other resonant circuit comprises an inductor L6 with one end connected with the signal output end, an inductor L4 and an inductor L5 with one end connected with the other end of the inductor L6 and the other end grounded, wherein the inductor L4 is connected with a varactor diode D3 in series and then grounded, and the input end of the varactor diode D3 is connected with a control voltage V IN3 The method comprises the steps of carrying out a first treatment on the surface of the The inductance L3 and the inductance L4 are coupled.
The method comprises the following steps:
adjusting in-band interpolation loss and standing waves: if the inductance values of the inductor L2 and the inductor L5 are larger, the standing wave difference is generated at the moment, and the inductance values of the inductor L2 and the inductor L5 are reduced, so that the standing wave is adjusted; if the inductance values of the inductor L2 and the inductor L5 are smaller, the standing wave difference is generated at the moment, the inductance values of the inductor L2 and the inductor L5 are increased, and thus standing waves are adjusted;
adjusting the center frequency: increasing the inductance value of the inductor L3 and the inductor L4, and reducing the center frequency; otherwise, the center frequency increases;
adjusting the bandwidth: the distance between the adjusting inductance L3 and the fourth inductance L4 is increased, and the bandwidth is reduced.
In a fourth aspect, the invention also discloses a method for adjusting the adjustable band-pass tuning frequency-selecting circuit, which is implemented based on the following circuit: an adjustable band-pass tuning frequency-selecting circuit comprises two resonant circuits cascaded in a symmetrical distribution mode, wherein one resonant circuit comprises an inductor L1, an inductor L2 and an inductor L3, one end of the inductor L1 is connected with a signal input end, the other end of the inductor L2 is connected with the other end of the inductor L1, the other end of the inductor L3 is grounded, a serially connected varactor D2 of the inductor L3 is grounded, and the input end of the varactor D2 is connected with a voltage V IN2 The method comprises the steps of carrying out a first treatment on the surface of the The other resonant circuit comprises an inductor L6 with one end connected with the signal output end, an inductor L4 and an inductor L5 with one end connected with the other end of the inductor L6 and the other end grounded, wherein the inductor L4 is connected with a varactor diode D3 in series and then grounded, and the input end of the varactor diode D3 is connected with a control voltage V IN3 The method comprises the steps of carrying out a first treatment on the surface of the By a means ofThe inductance L3 and the inductance L4 are coupled. The transformer also comprises a varactor D1 connected in parallel with the inductance L1, wherein the input end of the varactor D1 is connected with the voltage V IN1 。
The adjusting method comprises the following steps: adjusting in-band interpolation loss and standing waves: if the inductance values of the inductor L2 and the inductor L5 are larger, the standing wave difference is generated at the moment, and the inductance values of the inductor L2 and the inductor L5 are reduced, so that the standing wave is adjusted; if the inductance values of the inductor L2 and the inductor L5 are smaller, the standing wave difference is generated at the moment, the inductance values of the inductor L2 and the inductor L5 are increased, and thus standing waves are adjusted;
adjusting the center frequency: increasing the inductance value of the inductor L3 and the inductor L4, and reducing the center frequency; otherwise, the center frequency increases;
adjusting the bandwidth: the distance between the adjusting inductor L3 and the fourth inductor L4 is increased, and the bandwidth is reduced;
distance between zero and center frequency is adjusted: adjusting the inductance value of the inductance L1 and/or changing the control voltage V of the variable diode D1 IN1 Thereby changing the zero point position.
The beneficial effects of the invention are as follows:
1. the invention builds a circuit based on the varactor and the inductor, namely, the circuit is built by adopting an unconventional LC inductor, so that the invention has the advantages of simple integral structure, easy processing, small volume, low cost and debugging function;
2. the invention is convenient for debugging: the invention utilizes inductive space coupling, and can adjust the coupling coefficient by adjusting the distance of the coupling inductance, thereby completing bandwidth adjustment, improving the adjustment convenience and reducing the debugging difficulty; the center frequency can be adjusted by changing the inductance values of the inductor L3 and the inductor L4; the in-band insertion loss and the standing wave can be adjusted by changing the inductance L2 and the inductance L5;
3. the center frequency and the bandwidth of the designed adjustable band-pass tuning frequency-selecting circuit are easy to control, the center frequency can be controlled by controlling the magnitude of the control voltage so as to further control the capacitance value of the variable capacitance diode, and the bandwidth can be controlled by adjusting the distance of the coupling inductor; most importantly, based on the zero adjustable characteristic, the zero can be closer to the center frequency by adjusting the zero position, and the out-of-band inhibition is better;
4. the adjustable band-pass tuning frequency-selecting circuit designed by the invention introduces an adjustable zero point outside the band, and improves the out-of-band suppression degree. If D1 is not provided, only the center point is adjustable, and no zero point is adjustable; the introduction of the varactor diode D1 can quickly pull down the frequency and quickly reach the lowest position to form a resonance pit, namely a zero point; the filter introduces a resonance pit, so that the out-of-band suppression degree can be improved, namely the amplitude height at the right side of the zero point is lower than the amplitude height at the left side; and the out-of-band suppression degree is improved, unnecessary waves can be filtered, and the filtering effect is better.
Drawings
FIG. 1 is a schematic diagram of a bandpass tuning frequency selection circuit;
FIG. 2 is a graph of the amplitude-frequency response of the first embodiment of example 3;
FIG. 3 is a graph of the amplitude-frequency response of the second embodiment of example 3;
fig. 4 is a graph showing the amplitude-frequency response of the third embodiment in example 3.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, the present embodiment provides an adjustable band-pass tuning frequency-selecting circuit, which includes two resonant circuits cascaded in a symmetrical distribution mannerOne of the resonant circuits comprises an inductor L1 with one end connected with the signal input end, an inductor L2 and an inductor L3 with one end connected with the other end of the inductor L1 and the other end grounded, wherein the serially connected varactors D2 of the inductor L3 are grounded, and the input end of the varactors D2 is connected with a control voltage V IN2 ；
The other resonant circuit comprises an inductor L6 with one end connected with the signal output end, an inductor L4 and an inductor L5 with one end connected with the other end of the inductor L6 and the other end grounded, wherein the inductor L4 is connected with a varactor diode D3 in series and then grounded, and the input end of the varactor diode D3 is connected with a control voltage V IN3 ；
The inductance L3 and the inductance L4 are coupled.
As shown in fig. 1, the present embodiment includes six inductors: inductance L1, inductance L2, inductance L3, inductance L4, inductance L5, and inductance L6; two sets of varactor diodes: a varactor diode D2 and a varactor diode D3. The present embodiment mainly comprises the above components, and two symmetrically distributed tuning circuits of the present embodiment are formed. One end of the inductor L1 is connected with the input end, and the other end of the inductor L1 is connected between the inductor L2 and the inductor L3; one end of the inductor L2 is connected between the inductor L1 and the inductor L3, and the other end of the inductor L2 is grounded; one end of the inductor L3 is connected between the inductor L1 and the inductor L2, and the other end of the inductor L3 is grounded; and the inductor L3 is inductively coupled with the inductor L4; one end of the inductor L4 is grounded, and the other end of the inductor L4 is connected between the inductor L5 and the inductor L6; one end of the inductor L5 is connected between the inductor L4 and the inductor L6, and the other end is grounded; one end of the inductor L6 is connected with the output end, and the other end is connected between the inductor L4 and the inductor L5. The second group of varactors D2 are connected to the ground terminal of the inductor L3, and the third group of varactors D3 are connected to the ground terminal of the inductor L4.
In this embodiment, the band-pass tuning frequency-selecting circuit adopts two resonant circuits cascaded in a symmetrical distribution manner, so in order to make the poles of the two symmetrical circuits consistent, that is, make the transmission poles of the two resonant circuits coincide, the implementation is required as follows: for six inductors, the inductance value of the inductor L1 is consistent with the inductance value of the inductor L6, the inductance value of the inductor L2 is consistent with the inductance value of the inductor L5, and the inductance value of the inductor L3 is consistent with the inductance value of the inductor L4; two sets of varactors: the varactor diode D2 is consistent with the output value of the varactor diode D3, and specifically can be controlled by the same control voltage so that the output value is consistent. Thus, through the setting, the two resonant circuits can be symmetrical from the structure to the parameters, so that the transmission poles of the two resonant circuits can be overlapped, namely, the two resonant circuits have a peak; meanwhile, the obtained waveform is smooth and has good filtering effect.
In this embodiment, the inductance L2 and the inductance L5 are changed, so that the in-band insertion loss and the standing wave can be adjusted. Specifically, the second inductor adjusts standing waves according to actual conditions: if the inductance values of the inductor L2 and the inductor L5 are larger, the standing wave difference is reduced, so that the standing wave can be adjusted well; if the inductance values of the inductor L2 and the inductor L5 are smaller, the standing wave difference is increased, so that the standing wave can be adjusted. I.e. the adjustment of the inductance L2 and the inductance L5 needs to be decided in connection with the specific case.
The capacitance value of the varactor can be controlled by changing the inductance values of the inductor L3 and the inductor L4, so that the center frequency can be adjusted. Specifically, when the inductance value of the inductor L3 and the inductance value of the inductor L4 are increased, the center frequency is reduced; in practice, the required center frequency may be set according to the desired frequency of the signal.
Changing the distance of inductance L3 from inductance L4 can change the coupling coefficient k, thereby adjusting the bandwidth. Specifically, the coupling distance increases and the bandwidth decreases. The narrower the bandwidth, the better the out-of-band rejection over a range of bandwidths.
From the above, the invention has the following beneficial effects:
1. the invention builds a circuit based on the varactor and the inductor, namely, adopts an unconventional LC inductor, has the advantages of simple integral structure, easy processing, small volume, low cost and debugging function.
2. The invention is convenient for debugging: the invention utilizes inductive space coupling, and can adjust the coupling coefficient by adjusting the distance of the coupling inductance, thereby completing bandwidth adjustment, improving the adjustment convenience and reducing the debugging difficulty; the center frequency can be adjusted by changing the inductance values of the inductor L3 and the inductor L4; the in-band insertion loss and standing wave can be adjusted by changing the inductance L2 and the inductance L5.
Example 2
The embodiment provides an adjustable band-pass tuning frequency-selecting circuit, which comprises two resonant circuits cascaded in a symmetrical distribution mode, wherein one resonant circuit comprises an inductor L1, an inductor L2 and an inductor L3, one end of the inductor L1 is connected with a signal input end, the other end of the inductor L2 is connected with the other end of the inductor L1, the other end of the inductor L3 is grounded, a serially connected varactor diode D2 of the inductor L3 is grounded, and the input end of the varactor diode D2 is connected with a control voltage V IN2 ；
The other resonant circuit comprises an inductor L6 with one end connected with the signal output end, an inductor L4 and an inductor L5 with one end connected with the other end of the inductor L6 and the other end grounded, wherein the inductor L4 is connected with a varactor diode D3 in series and then grounded, and the input end of the varactor diode D3 is connected with a control voltage V IN3 ；
The inductance L3 and the inductance L4 are coupled.
The adjustable band-pass tuning frequency-selecting circuit also comprises a variable capacitance diode D1 connected with the inductor L1 in parallel, wherein the input end of the variable capacitance diode D1 is connected with a control voltage V IN1 。
In this embodiment, a set of varactors D1 connected in parallel with an inductor L1 is added on the basis of embodiment 1. Meanwhile, preferably, the inductor is a high Q inductor. Preferably, the control voltage V IN1 And control voltage V IN2 Is the same variable voltage source.
In this embodiment, changing the inductance value of the inductor L1 can change the resonant frequency of the varactor D1 and the inductor L1, and then change the position of the resonant pit, that is, change the position of the zero point, so as to achieve the purpose of adjusting the zero point. Specifically, by adjusting the inductance value of the inductor L1, the adjustable zero is closer to the center frequency, and out-of-band rejection is better.
Meanwhile, in the embodiment, the control voltage V can be adjusted IN1 I.e. the magnitude of the control voltage connected to the input of the varactor diode D1 is changed, thereby changing the position of the zero point.
Based on the two zero point adjusting modes, the invention combines the two zero point adjusting modes, namelyBy varying the inductance value of inductance L1 and regulating control voltage V IN1 The position of the zero point is changed, the purpose of adjusting the zero point is achieved, and the adjustment effect is better through comprehensive adjustment in various modes.
In summary, the center frequency and the bandwidth of the adjustable band-pass tuning frequency-selecting circuit designed by the invention are easy to control, the center frequency can be controlled by controlling the magnitude of the control voltage and further controlling the capacitance value of the varactor, and the bandwidth can be controlled by adjusting the distance of the coupling inductor. Most importantly, based on the zero adjustable characteristic, the zero can be closer to the center frequency by adjusting the zero position, and out-of-band rejection is better.
The adjustable band-pass tuning frequency-selecting circuit designed by the invention introduces an adjustable zero point outside the band (the point where the signal does not pass, namely the varactor diode D1 in figure 1), thereby improving the out-of-band suppression degree. If D1 is not provided, only the center point is adjustable, and no zero point is adjustable. The introduction of the varactor diode D1 can quickly pull down the frequency and quickly reach the lowest position to form a resonance pit, namely a zero point; the filter introduces a resonance pit, so that the out-of-band suppression degree can be improved, namely the amplitude height at the right side of the zero point is lower than the amplitude height at the left side; and the out-of-band suppression degree is improved, unnecessary waves can be filtered, and the filtering effect is better.
Example 3
The invention discloses an adjustable electric tunable filter, in particular to an inductance coupling zero point adjustable electric tunable filter suitable for a microwave plane circuit, wherein a band-pass tuning frequency-selecting circuit of the electric tunable filter is the band-pass tuning frequency-selecting circuit in the embodiment 1 or the embodiment 2.
The inductance value of each inductance is regulated to make the center frequency of the band-pass tuning frequency-selecting circuit reach 200-400MHz, and the regulation control voltage V connected with the varactor diode D1 is regulated IN1 Is variable, producing a zero point. Specifically, the amplitude-frequency response curves of the tunable filter with the tunable center frequency are shown in fig. 2, 3 and 4. In the figure, DB (S2, 1) is a signal transmission characteristic curve, and curves VSWR (1) and VSWR (2) are signal port reflection curves. The left-hand value of the amplitude-frequency response curve is the insertion loss, the right-hand valueIs standing wave ratio.
The first implementation case: when the capacitance value of the varactor diode D1 is 9pF, the capacitance values of the varactor diode D2 and the varactor diode D3 are 60pF (the capacitance of the varactor diode is adjusted by adjusting the corresponding control voltage, the larger the control voltage is, the smaller the capacitance of the varactor diode is), as can be seen from fig. 2, the center frequency of the tunable filter is 200MHz, the band interpolation loss is-1.2 db, the 3db bandwidth is 7.9MHz, and the zero point is located at 258 MHz.
The second implementation case: when the capacitance of the varactor diode D1 is 5.2pF, the capacitances of the varactor diode D2 and the varactor diode D3 are 27.4pF, as can be seen from fig. 3, the center frequency of the electrically tunable filter is 300Hz, the in-band loss is-1.4 db, the 3db bandwidth is 8.5MHz, and the zero point is at 355 MHz.
Third implementation case: when the capacitance of the varactor diode D1 is 2.5pF, the capacitances of the varactor diode D2 and the varactor diode D3 are 15.6pF, as can be seen from fig. 4, the center frequency of the tunable filter is 400MHz, the band interpolation loss is-1.5 db, the 3db bandwidth is 9MHz, and the zero point is located at 482.6 MHz.
From the above, the smaller the capacitance value, the larger the center frequency, and the position of the zero point from the center frequency is decreased and then increased.
Example 4
The invention discloses a method for adjusting an adjustable band-pass tuning frequency-selecting circuit, which is implemented based on the circuit in embodiment 1.
The method comprises the following steps:
adjusting in-band interpolation loss and standing waves: if the inductance values of the inductor L2 and the inductor L5 are larger, the standing wave difference is generated at the moment, and the inductance values of the inductor L2 and the inductor L5 are reduced, so that the standing wave is adjusted; if the inductance values of the inductor L2 and the inductor L5 are smaller, the standing wave difference is generated at the moment, the inductance values of the inductor L2 and the inductor L5 are increased, and thus standing waves are adjusted;
adjusting the center frequency: increasing the inductance value of the inductor L3 and the inductor L4, and reducing the center frequency; otherwise, the center frequency increases;
adjusting the bandwidth: the distance between the adjusting inductance L3 and the fourth inductance L4 is increased, and the bandwidth is reduced.
Example 5
The invention also discloses a regulating method of the adjustable band-pass tuning frequency selecting circuit, which is implemented based on the circuit in the embodiment 2.
The adjusting method comprises the following steps: adjusting in-band interpolation loss and standing waves: if the inductance values of the inductor L2 and the inductor L5 are larger, the standing wave difference is generated at the moment, and the inductance values of the inductor L2 and the inductor L5 are reduced, so that the standing wave is adjusted; if the inductance values of the inductor L2 and the inductor L5 are smaller, the standing wave difference is generated at the moment, the inductance values of the inductor L2 and the inductor L5 are increased, and thus standing waves are adjusted;
adjusting the center frequency: increasing the inductance value of the inductor L3 and the inductor L4, and reducing the center frequency; otherwise, the center frequency increases;
adjusting the bandwidth: the distance between the adjusting inductor L3 and the fourth inductor L4 is increased, and the bandwidth is reduced;
distance between zero and center frequency is adjusted: adjusting the inductance value of the inductance L1 and/or changing the control voltage V of the variable diode D1 IN1 Thereby changing the zero point position.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. The utility model provides an adjustable band-pass tuning frequency-selecting circuit, its characterized in that, band-pass tuning frequency-selecting circuit includes two resonant circuits that concatenate with symmetrical distribution mode, one of them resonant circuit includes inductance L1 that one end is connected with the signal input, inductance L2 and inductance L3 that one end all is connected with inductance L1 other end and the other end all is grounded, just concatenate varactor D2 of inductance L3 is grounded behind, varactor D2's input access control voltage V IN2 ；
The other resonant circuit comprises an inductor L6 with one end connected with the signal output end, an inductor L4 and an inductor L5 with one end connected with the other end of the inductor L6 and the other end grounded, wherein the inductor L4 is connected with a varactor diode D3 in series and then grounded, and the input end of the varactor diode D3 is connected into the circuitControl voltage V IN3 ；
The inductor L3 is coupled with the inductor L4;
the transformer also comprises a varactor D1 connected in parallel with the inductance L1, wherein the input end of the varactor D1 is connected with the voltage V IN1 。
2. The tunable bandpass tuning frequency selective circuit of claim 1 wherein the inductor is a high Q inductor.
3. An adjustable bandpass tuning frequency selective circuit according to claim 1, wherein said control voltage V IN1 And control voltage V IN2 Is the same variable voltage source.
4. An adjustable electrically tunable filter, wherein the bandpass tuning frequency selection circuit of the electrically tunable filter is the bandpass tuning frequency selection circuit of any one of claims 1 to 3.
5. A method for adjusting an adjustable band-pass tuning frequency-selecting circuit, wherein the adjusting method is based on the band-pass tuning frequency-selecting circuit as claimed in any one of claims 1, 2 and 3, and the adjusting method comprises:
adjusting in-band interpolation loss and standing waves: if the inductance values of the inductor L2 and the inductor L5 are larger, the standing wave difference is generated at the moment, and the inductance values of the inductor L2 and the inductor L5 are reduced, so that the standing wave is adjusted; if the inductance values of the inductor L2 and the inductor L5 are smaller, the standing wave difference is generated at the moment, the inductance values of the inductor L2 and the inductor L5 are increased, and thus standing waves are adjusted;
adjusting the center frequency: increasing the inductance value of the inductor L3 and the inductor L4, and reducing the center frequency; otherwise, the center frequency increases;
adjusting the bandwidth: the distance between the adjusting inductance L3 and the fourth inductance L4 is increased, and the bandwidth is reduced.
6. A method for adjusting an adjustable band-pass tuning frequency-selecting circuit, wherein the adjusting method is based on the band-pass tuning frequency-selecting circuit according to claim 1, and the adjusting method comprises:
adjusting in-band interpolation loss and standing waves: if the inductance values of the inductor L2 and the inductor L5 are larger, the standing wave difference is generated at the moment, and the inductance values of the inductor L2 and the inductor L5 are reduced, so that the standing wave is adjusted; if the inductance values of the inductor L2 and the inductor L5 are smaller, the standing wave difference is generated at the moment, the inductance values of the inductor L2 and the inductor L5 are increased, and thus standing waves are adjusted;
adjusting the center frequency: increasing the inductance value of the inductor L3 and the inductor L4, and reducing the center frequency; otherwise, the center frequency increases;
adjusting the bandwidth: the distance between the adjusting inductor L3 and the fourth inductor L4 is increased, and the bandwidth is reduced;
distance between zero and center frequency is adjusted: adjusting the inductance value of the inductance L1 and/or changing the control voltage V of the variable diode D1 IN1 Thereby changing the zero point position.
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| CN114710129A (en) * | 2022-04-19 | 2022-07-05 | 电子科技大学 | Electrically tunable filter and method for widening tuning range |
| CN116915202B (en) * | 2023-09-14 | 2023-12-29 | 成都世源频控技术股份有限公司 | LC band-pass filter with adjustable transmission zero point |
| CN118041273B (en) * | 2024-04-15 | 2024-06-18 | 西南应用磁学研究所(中国电子科技集团公司第九研究所) | Automatic debugging method of frequency hopping filter |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1086808A (en) * | 1964-04-14 | 1967-10-11 | Westinghouse Electric Corp | Tunable frequency selective circuits |
| JPH07131367A (en) * | 1993-10-28 | 1995-05-19 | Matsushita Electric Ind Co Ltd | Variably tuned band pass filter |
| JP2002335175A (en) * | 2001-05-10 | 2002-11-22 | Alps Electric Co Ltd | Television tuner |
| JP2006086999A (en) * | 2004-09-17 | 2006-03-30 | Alps Electric Co Ltd | Band-switching tuning circuit |
| CN101312339A (en) * | 2007-05-25 | 2008-11-26 | 阿尔卑斯电气株式会社 | Double tuned circuit of video tuner |
| CN202050389U (en) * | 2010-12-29 | 2011-11-23 | 海能达通信股份有限公司 | Radio frequency band-pass filter circuit |
| CN102509824A (en) * | 2011-10-27 | 2012-06-20 | 无锡南理工科技发展有限公司 | Hybrid lumped distribution miniature band-pass filter |
| JP2013021394A (en) * | 2011-07-07 | 2013-01-31 | Renesas Electronics Corp | Integrated circuit having bandpass filter circuit, method and program for controlling bandpass filter circuit, and logic circuit for executing the control method |
| WO2014156343A1 (en) * | 2013-03-28 | 2014-10-02 | 株式会社村田製作所 | Lc filter element and lc filter |
| JPWO2013005264A1 (en) * | 2011-07-07 | 2015-02-23 | 富士通株式会社 | Variable filter device and communication device |
| CN205792482U (en) * | 2016-05-26 | 2016-12-07 | 贵阳顺络迅达电子有限公司 | A kind of dual pathways bounce frequency filter |
| CN107947752A (en) * | 2017-12-29 | 2018-04-20 | 中国电子科技集团公司第四十三研究所 | A kind of bandpass filter |
| CN108574345A (en) * | 2017-03-10 | 2018-09-25 | 重庆邮电大学 | A kind of wireless power transmission equipment transmitting terminal self-adapting tuning device and tuning methods |
| CN109921761A (en) * | 2019-03-18 | 2019-06-21 | 南通大学 | It is a kind of to reconcile the reconfigurable filter of switchable function with passband |
| CN112104336A (en) * | 2020-09-15 | 2020-12-18 | 上海鸿晔电子科技股份有限公司 | Wide tuning electrically tunable filter |
| CN213661585U (en) * | 2020-10-30 | 2021-07-09 | 深圳顺络迅达电子有限公司 | Micro-packaged electrically tunable filter |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3103621U (en) * | 2004-02-26 | 2004-08-19 | アルプス電気株式会社 | Television tuner |
| GB2427088B (en) * | 2005-06-08 | 2008-12-24 | Zarlink Semiconductor Ltd | Radio frequency tuner |
| US8044732B2 (en) * | 2008-02-12 | 2011-10-25 | International Business Machines Corporation | Continuously tunable inductor and method to continuously tune an inductor |
| JP2013005264A (en) * | 2011-06-17 | 2013-01-07 | Toshiba Corp | Moving object tracking device and reference point tracking method |
-
2021
- 2021-12-08 CN CN202111496307.1A patent/CN114257213B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1086808A (en) * | 1964-04-14 | 1967-10-11 | Westinghouse Electric Corp | Tunable frequency selective circuits |
| JPH07131367A (en) * | 1993-10-28 | 1995-05-19 | Matsushita Electric Ind Co Ltd | Variably tuned band pass filter |
| JP2002335175A (en) * | 2001-05-10 | 2002-11-22 | Alps Electric Co Ltd | Television tuner |
| JP2006086999A (en) * | 2004-09-17 | 2006-03-30 | Alps Electric Co Ltd | Band-switching tuning circuit |
| CN101312339A (en) * | 2007-05-25 | 2008-11-26 | 阿尔卑斯电气株式会社 | Double tuned circuit of video tuner |
| CN202050389U (en) * | 2010-12-29 | 2011-11-23 | 海能达通信股份有限公司 | Radio frequency band-pass filter circuit |
| JPWO2013005264A1 (en) * | 2011-07-07 | 2015-02-23 | 富士通株式会社 | Variable filter device and communication device |
| JP2013021394A (en) * | 2011-07-07 | 2013-01-31 | Renesas Electronics Corp | Integrated circuit having bandpass filter circuit, method and program for controlling bandpass filter circuit, and logic circuit for executing the control method |
| CN102509824A (en) * | 2011-10-27 | 2012-06-20 | 无锡南理工科技发展有限公司 | Hybrid lumped distribution miniature band-pass filter |
| WO2014156343A1 (en) * | 2013-03-28 | 2014-10-02 | 株式会社村田製作所 | Lc filter element and lc filter |
| JP2016106445A (en) * | 2013-03-28 | 2016-06-16 | 株式会社村田製作所 | Lc filter elemental body and lc filter |
| CN205792482U (en) * | 2016-05-26 | 2016-12-07 | 贵阳顺络迅达电子有限公司 | A kind of dual pathways bounce frequency filter |
| CN108574345A (en) * | 2017-03-10 | 2018-09-25 | 重庆邮电大学 | A kind of wireless power transmission equipment transmitting terminal self-adapting tuning device and tuning methods |
| CN107947752A (en) * | 2017-12-29 | 2018-04-20 | 中国电子科技集团公司第四十三研究所 | A kind of bandpass filter |
| CN109921761A (en) * | 2019-03-18 | 2019-06-21 | 南通大学 | It is a kind of to reconcile the reconfigurable filter of switchable function with passband |
| CN112104336A (en) * | 2020-09-15 | 2020-12-18 | 上海鸿晔电子科技股份有限公司 | Wide tuning electrically tunable filter |
| CN213661585U (en) * | 2020-10-30 | 2021-07-09 | 深圳顺络迅达电子有限公司 | Micro-packaged electrically tunable filter |
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