CN209804862U - Band-pass filter with center frequency and bandwidth being adjusted in double mode - Google Patents
Band-pass filter with center frequency and bandwidth being adjusted in double mode Download PDFInfo
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- CN209804862U CN209804862U CN201920920848.4U CN201920920848U CN209804862U CN 209804862 U CN209804862 U CN 209804862U CN 201920920848 U CN201920920848 U CN 201920920848U CN 209804862 U CN209804862 U CN 209804862U
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Abstract
The utility model discloses a band-pass filter of center frequency and bandwidth bitonic, band-pass filter includes signal input part, signal output part, magnetic circuit and two resonance circuit that are arranged in the magnetic circuit, is equipped with matching circuit between two resonance circuit, the magnetic circuit is self-shielding structure, including yoke and the central pole that sets up vertically, the pole is improved level and is seted up a working air gap, working air gap divides the pole into upper and lower two parts, and the middle part of one or two terminal surfaces of upper and lower two parts relative, vertically has seted up a breach, the breach divide its terminal surface into left and right two halfbodies; the winding has the connection main coil on the utmost point post, and the winding has the number of turns the same on two halfbodies, opposite direction's secondary coil, and main current exciter is connected to the main coil, is used for adjusting the utility model discloses whole frequency forms the wrong coil of frequently after two secondary coil establish ties, and after the magnetic circuit was drawn forth to two ports of the wrong coil of frequently, connects a wrong current exciter of frequently, is used for adjusting the utility model discloses whole bandwidth.
Description
Technical Field
The utility model relates to a band pass filter especially relates to a band pass filter of center frequency and bandwidth bitonic.
Background
The current trend of integrated development of integrated electronic devices in microwave frequency band requires that the front-end preselector meets the common use of multiple working tasks, i.e. the filter unit not only needs to realize the center frequency f0Wide range tuning with simultaneous bandwidth BW3dBAlso have a range of adjustability, i.e. double tuning f0And BW3dB。
in the microwave frequency range, the switch filter bank can realize double modulation by applying the accumulation of elements such as a switch, a dot frequency filter and the like0The wider the coverage, the greater the number of stacks, if BW is further achieved3dBWith this variation, the number of component stacks will also multiply. The indexes such as weight, power consumption, insertion loss and reliability are greatly reduced, so that the practicability is poor, and the application in a narrow frequency band range can be met.
however, the current magnetic tuning filter has no double-tuning technology, and the double-tuning technology belongs to the gap filling. In the prior art, a magnetic tuning filter meets the resonance condition and is f in the microwave and millimeter wave frequency bands0can realize continuous tuning of multiple octaves, has the characteristic of ultra-wide band work which is not possessed by other types of filters, but the current magnetic tuning filter does not possess BW3dBA tuning capability.
Referring to the attached figure 1, the orthogonal ring-sphere coupling circuit model diagram of the magnetic tuning filter in the prior art is attached, and on the premise of meeting the resonance condition, the f of the single crystal bead is controlled by using an external magnetic field0When changing the external magnetic field, f0Will follow the change to realize f0Adjustable in BW3dBIn the expression, BW is affected3dBThe size is the single crystal ball, the dimension parameter of the coupling ring and the magnetic parameter of the single crystal ball, and the two are solid elements, the parameter change is difficult, wherein the magnetic parameter of the ball is influenced by the temperature factor and can be changed in a certain range. Thus magnetically tuned filter BW3dBAfter the design and production debugging are completed, the magnetic parameters of the magnetically tuned monocrystal pellets can be changed within a certain range due to the temperature characteristics, but the change has no practicability.
in addition, the working principle of the switch filter bank is shown in fig. 2: the switch filter bank is mainly composed of a single-pole multi-throw switch (or combination), a dot frequency filter, a control circuit and the like, and a schematic block diagram is shown in fig. 2. It can be seen that the principle scheme is that the dot-frequency filters are stacked, the stacking number is increased along with the increase of the working frequency range, and if BW in the full-band working frequency range is further realized3dBVariable, the number of piles will increase several times. The indexes of volume, weight, reliability and the like are seriously influenced, so that the scheme is difficult to meet the requirements of miniaturization, light weight, high reliability and the like of the current electronic equipment.
Therefore, in summary, the following disadvantages exist in the prior art:
(1) the magnetic tuning filter can only be f in the microwave and millimeter wave frequency band0the device is adjustable, and other types have no practical double-adjustment technical scheme.
(2) The double-modulation scheme of the switch filter is not suitable for the requirements of miniaturization, light weight, high reliability and the like of the current electronic equipment.
disclosure of Invention
An object of the utility model is to provide a solve above-mentioned problem, realize a center frequency and bandwidth bitonic band pass filter and modulation method of filter center frequency and bandwidth under the unanimous condition of traditional magnetism tuning filter volume, weight.
In order to achieve the above purpose, the utility model adopts the technical scheme that: a band-pass filter with double-modulation of center frequency and bandwidth comprises a signal input end, a signal output end, a magnetic circuit and two resonance circuits in the magnetic circuit, wherein the resonance circuits are formed by coupling of multi-stage small ball harmonic oscillators, the two resonance circuits are identical in parameter and are symmetrically arranged, two ends of the whole body after being connected in series are respectively connected with the signal input end and the signal output end, and a matching circuit is arranged between the two resonance circuits; the matching circuit is used for standing wave matching between the two resonant circuits;
The magnetic circuit is of a self-shielding structure and comprises a magnetic yoke and a pole, wherein the center of the pole is vertically arranged, a working air gap is horizontally arranged on the pole, the pole is divided into an upper part and a lower part by the working air gap, a gap is vertically arranged in the middle of one or two opposite end surfaces of the upper part and the lower part, and the end surface where the gap is arranged is divided into a left half body and a right half body by the gap;
the pole is wound with a main coil, and two ports of the main coil are connected with a main current exciter after leading out a magnetic circuit;
the two half bodies are wound with auxiliary coils with the same number of turns and opposite directions, the two auxiliary coils are connected in series to form a staggered frequency coil, and two ports of the staggered frequency coil are connected with a staggered frequency current exciter after leading out a magnetic circuit;
The gap also divides the working air gap into a left subarea and a right subarea, and the two resonance circuits are respectively and symmetrically arranged in the two subareas.
preferably, the method comprises the following steps: the matching circuit is in a structure of serially connected attenuator and amplifier, the attenuator is used for standing wave matching when the frequencies of the two resonant circuits are staggered, and the amplifier is used for reducing insertion loss.
A modulation method of a band-pass filter with double modulation of center frequency and bandwidth comprises the following steps:
(1) Designing a magnetic circuit, a resonant circuit, designing the resonant circuit and integrating with a matching circuit into a whole to construct a band-pass filter with center frequency and bandwidth dual-modulation;
(2) Adjusting the frequency or bandwidth;
the adjustment frequency is: adjusting the main current exciter to change the output current of the main current exciter so as to simultaneously adjust the magnetic fields of the two subareas, wherein the frequency of the band-pass filter with the center frequency and the bandwidth which are double-tuned is changed along with the change of the output current of the main current exciter;
The bandwidth is adjusted as follows: and adjusting the cross-frequency current exciter to change the output current of the cross-frequency current exciter so that the two subareas obtain magnetic fields with the same size and opposite directions, wherein the bandwidth of the band-pass filter with the center frequency and the bandwidth being double-tuned is changed along with the change of the output current of the cross-frequency current exciter.
The resonance circuit of the utility model has the same structure as the magnetic tuning band-pass filter in the prior art, and the parameters of every two resonance circuits are the same and symmetrically arranged, so that the resonance frequency of the two resonance circuits is the same under the same magnetic field;
The utility model discloses utmost point post structural design is special, sets up the breach on utmost point post mainly, the breach divide into two divisions with working air gap, can form the halfbody at the terminal surface of utmost point post simultaneously, is used for twining the secondary coil, and utmost point post is used for twining the main coil, and in the time of the design, we twine the main coil on utmost point post, twine the secondary coil that the number of turns is the same, opposite direction in two divisions opposite directions, again because the breach still divide into two divisions with working air gap, and two resonant circuit symmetry respectively set up in two divisions, so, that the main coil corresponds are two resonant circuit, and the secondary coil corresponds a resonant circuit respectively, and the magnetic field direction that the secondary coil produced is opposite to two resonant circuit.
The principle of frequency modulation is as follows: we control the main current exciter to change the output current, in effect, to adjust the magnetic field of both sub-sections simultaneously, thereby adjusting the center frequency f of both resonant circuits synchronously0I.e. adjusting the overall center frequency f0。
The principle of adjusting the bandwidth is as follows: when the output current is changed by controlling the cross-frequency current exciter, the two subareas can obtain magnetic field excitation with the same magnitude and opposite directions. As shown in fig. 7, when the current input of the cross-frequency current exciter is 0, the center frequencies of the two resonant circuits are overlapped to obtain the maximum bandwidth; when the current input of the cross-frequency current exciter causes the center frequencies of the two resonant circuits to be staggered, the bandwidth is narrowed; the minimum bandwidth is obtained when the two resonant circuits are misaligned to the passband edge, i.e., one right edge and one left edge.
and because the two resonant circuits adopt phasesthe same parameter design, the same bandwidth, the same magnitude of magnetic field excitation and opposite direction of the cross-frequency current exciter, so that the central frequency f of the passband is changed0The bandwidth can be adjusted independently without changing.
compared with the prior art, the utility model has the advantages of:
(1) The utility model discloses established a band pass filter of new central frequency and bandwidth bitonic, it improves on band pass filter's basis, does not increase too much bypass, so it has comprehensive advantage for switch filter bank in aspects such as volume, weight, harmonious continuity, reliability aspect.
(2) the magnetic tuning double-tone filter integrates two groups of resonant circuits and matching circuits, and is suitable for the application of the filter in the field of the power supplyf 0 The monotonous general magnetic tuning filter has the indexes of consistent volume, weight, power consumption and the like, and has better effect.
(3) Through the partition design of magnetic circuit magnetic pole, the design of main coil, mistake frequency coil, make the utility model discloses carrying outBW 3dB while tuningf 0 The driver circuit and the control program can be simplified while keeping the same.
(4) Two current exciters are adopted and are independently controlled,f 0 AndBW 3dB The frequency setting and the tuning are independent and do not influence each other. And BW3dBCan realize continuous change and is simple to control.
Drawings
FIG. 1 is a diagram of a prior art quadrature round-spherical coupling circuit model of a magnetically tuned filter;
FIG. 2 is a schematic block diagram of a prior art switch filter bank;
FIG. 3 is a schematic diagram of the design of the dual-tuned resonant circuit of the present invention;
FIG. 4 is a schematic diagram of the magnetic circuit design of the present invention;
FIG. 5 is a schematic view of the wound coil of FIG. 4 with the resonant circuit installed;
FIG. 6 is a schematic circuit diagram of the present invention;
FIG. 7Do the utility model discloses adjust the center frequency f of the alternate frequency current exciter to two resonance circuits0Bandwidth schematic when fully overlapping;
FIG. 8 shows the adjustment of the center frequency f of the cross-frequency current exciter to two resonant circuits0Schematic of bandwidth at stagger.
In the figure: 1. a coupling ring; 2. a single crystal pellet; 3. a signal input terminal; 4. a signal output terminal; 5. a magnetic yoke; 6. a pole column; 7. a notch; 8. a resonant circuit; 9. a main coil; 10. a frequency-staggered coil; 11. a half body; 12. a working air gap.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
example 1: referring to fig. 1, fig. 1 is a cross-loop spherical coupling circuit model of a magnetic tuning filter, which includes a single crystal ball 2 and a coupling loop 1. On the premise of meeting the resonance condition, the f of the monocrystal small ball 2 is controlled by using an external magnetic field0When changing the external magnetic field, f0Will follow the change to realize f0Adjustable in BW3dBIn the expression, BW is affected3dBthe size is the parameters of the single crystal ball 2, the coupling ring 1 and the magnetic parameters of the single crystal ball 2, and the two are solid elements, the parameter change is difficult, wherein the magnetic parameters of the ball can be influenced by the temperature factor and can be changed within a certain range, but the change has no practicability.
Example 2: referring to fig. 2, it can be seen that the principle scheme is that the dot-frequency filters are stacked, the number of stacked dot-frequency filters increases with the increase of the operating frequency range, and if BW in the full-band operating frequency range is further realized3dBVariable, the number of piles will increase several times. The indexes of volume, weight, reliability and the like are seriously influenced, so that the scheme is difficult to meet the requirements of miniaturization, light weight, high reliability and the like of the current electronic equipment.
Example 3: referring to fig. 3 to 8, the band-pass filter with double-modulation of center frequency and bandwidth comprises a signal input end 3, a signal output end 4, a magnetic circuit and two resonance circuits 8 positioned in the magnetic circuit, wherein the resonance circuits 8 are formed by coupling a plurality of small-ball harmonic oscillators, the two resonance circuits 8 have the same parameters and are symmetrically arranged, two ends of the whole body after being connected in series are respectively connected with the signal input end 3 and the signal output end 4, and a matching circuit is arranged between the two resonance circuits 8; the matching circuit is used for standing wave matching between the two resonant circuits 8;
The magnetic circuit is of a self-shielding structure and comprises a magnetic yoke 5 and a pole 6 vertically arranged in the center, a working air gap 12 is horizontally arranged on the pole 6, the pole 6 is divided into an upper part and a lower part by the working air gap 12, a gap 7 is vertically arranged in the middle of one or two opposite end faces of the upper part and the lower part, and the end face where the gap 7 is arranged is divided into a left half body and a right half body 11 by the gap 7;
The pole 6 is wound with a main coil 9, and two ports of the main coil 9 are connected with a main current exciter after leading out a magnetic circuit;
The two half bodies 11 are wound with auxiliary coils with the same number of turns and opposite directions, the two auxiliary coils are connected in series to form a staggered frequency coil 10, and two ports of the staggered frequency coil 10 are connected with a staggered frequency current exciter after leading out a magnetic circuit;
The gap 7 also divides the working air gap 12 into a left sub-area and a right sub-area, and the two resonance circuits 8 are respectively and symmetrically arranged in the two sub-areas.
in this embodiment, the matching circuit is a series structure of an attenuator and an amplifier, the attenuator is used for standing wave matching when the frequencies of the two resonant circuits 8 are dislocated, and the amplifier is used for reducing insertion loss.
regarding the design of the half body 11, the notch 7 can be opened in the middle of one or two end faces of the pole 6 opposite to the upper part and the lower part according to actual needs. And is not limited herein.
A modulation method of a band-pass filter with double modulation of center frequency and bandwidth comprises the following steps:
(1) Designing a magnetic circuit, designing a resonant circuit 8, designing the resonant circuit 8 and integrating with a matching circuit into a whole to construct a band-pass filter with double modulation of center frequency and bandwidth;
(2) adjusting the frequency or bandwidth;
the adjustment frequency is: adjusting the main current exciter to change the output current of the main current exciter so as to simultaneously adjust the magnetic fields of the two subareas, wherein the frequency of the band-pass filter with the center frequency and the bandwidth which are double-tuned is changed along with the change of the output current of the main current exciter;
The bandwidth is adjusted as follows: and adjusting the cross-frequency current exciter to change the output current of the cross-frequency current exciter so that the two subareas obtain magnetic fields with the same size and opposite directions, wherein the bandwidth of the band-pass filter with the center frequency and the bandwidth being double-tuned is changed along with the change of the output current of the cross-frequency current exciter.
The principle of adjusting the frequency is as follows: controlling the main current exciter to simultaneously adjust the magnetic fields of the two sub-zones, thereby synchronously adjusting the center frequencies f of the two resonant circuits 80I.e. adjusting the overall center frequency f0thus, the purpose of independent frequency modulation is achieved.
the principle of adjusting the bandwidth is as follows: by controlling the cross-frequency current exciter, the two subareas can obtain magnetic field excitation with the same magnitude and opposite directions. As shown in fig. 7, when the current input of the cross-frequency current exciter is 0, the center frequencies of the two resonant circuits 8 are overlapped to obtain the maximum bandwidth; when the current is increased to shift the center frequencies of the two resonant circuits 8, the bandwidth is narrowed; referring to fig. 8, the minimum bandwidth is obtained when the two resonant circuits 8 are misaligned to the passband edge, i.e., one right edge and one left edge as shown in fig. 8.
Because the utility model discloses in, two resonant circuit 8 adopt the same parameter design, have the same bandwidth, the current exciter magnetic field excitation size of mistake frequently is the same again, opposite direction to after the bandwidth change, the central frequency f of passband0The bandwidth can be adjusted independently without changing.
The test sample is manufactured according to the above structure, and the main indexes of the double-modulation filter are realized as follows:
Number of stages of resonant circuit 8: stage 6 x 2;
the global ratio: 2: 1;
single crystal pellet 2: 1750Gs, phi 0.35 mm;
number of turns of main coil 9: 800 turns;
Number of turns of the secondary coil: 30 turns x 2;
Center frequency (f 0 ) Tuning range: 4GHz～8GHz；
bandwidth (BW 3dB ) Tuning range: 30 MHz-80 MHz;
(note: realizing continuous tuning of the bandwidth between 30MHz and 80MHz at any central frequency point in the working frequency range of 4GHz to 8 GHz.)
insertion loss: less than or equal to 3 dB;
Ripple and false response: less than or equal to 2.5 dB;
Rectangle factor (3 dB: 40 dB): 1.4: 1/@80MHz bandwidth; 4: 1/@30MHz bandwidth.
the above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (2)
1. A bandpass filter with center frequency and bandwidth that is double tuned, said bandpass filter comprising a signal input, a signal output, a magnetic circuit and two resonant circuits located in the magnetic circuit, characterized in that: the resonance circuit is formed by coupling a plurality of levels of small ball harmonic oscillators, the two resonance circuits have the same parameters and are symmetrically arranged, two ends of the whole body after being connected in series are respectively connected with a signal input end and a signal output end, and a matching circuit is arranged between the two resonance circuits; the matching circuit is used for standing wave matching between the two resonant circuits;
The magnetic circuit is of a self-shielding structure and comprises a magnetic yoke and a pole, wherein the center of the pole is vertically arranged, a working air gap is horizontally arranged on the pole, the pole is divided into an upper part and a lower part by the working air gap, a gap is vertically arranged in the middle of one or two opposite end surfaces of the upper part and the lower part, and the end surface where the gap is arranged is divided into a left half body and a right half body by the gap;
The pole is wound with a main coil, and two ports of the main coil are connected with a main current exciter after leading out a magnetic circuit;
The two half bodies are wound with auxiliary coils with the same number of turns and opposite directions, the two auxiliary coils are connected in series to form a staggered frequency coil, and two ports of the staggered frequency coil are connected with a staggered frequency current exciter after leading out a magnetic circuit;
the gap also divides the working air gap into a left subarea and a right subarea, and the two resonance circuits are respectively and symmetrically arranged in the two subareas.
2. the bandpass filter according to claim 1, wherein the bandpass filter has a center frequency and a bandwidth that are both tunable: the matching circuit is in a structure of serially connected attenuator and amplifier, the attenuator is used for standing wave matching when the frequencies of the two resonant circuits are staggered, and the amplifier is used for reducing insertion loss.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920920848.4U CN209804862U (en) | 2019-06-19 | 2019-06-19 | Band-pass filter with center frequency and bandwidth being adjusted in double mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920920848.4U CN209804862U (en) | 2019-06-19 | 2019-06-19 | Band-pass filter with center frequency and bandwidth being adjusted in double mode |
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| CN209804862U true CN209804862U (en) | 2019-12-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110137646A (en) * | 2019-06-19 | 2019-08-16 | 西南应用磁学研究所 | A kind of bandpass filter and modulator approach of centre frequency and the double tune of bandwidth |
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2019
- 2019-06-19 CN CN201920920848.4U patent/CN209804862U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110137646A (en) * | 2019-06-19 | 2019-08-16 | 西南应用磁学研究所 | A kind of bandpass filter and modulator approach of centre frequency and the double tune of bandwidth |
| CN110137646B (en) * | 2019-06-19 | 2024-01-16 | 西南应用磁学研究所 | Band-pass filter with double-modulation center frequency and bandwidth and modulation method |
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