CN210609132U - Self-adaptive multi-element orthogonal wave trap - Google Patents
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- CN210609132U CN210609132U CN201922483552.3U CN201922483552U CN210609132U CN 210609132 U CN210609132 U CN 210609132U CN 201922483552 U CN201922483552 U CN 201922483552U CN 210609132 U CN210609132 U CN 210609132U
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Abstract
The utility model relates to a many units of self-adaptation quadrature trapper, include: an input coupling unit, an orthogonal notch unit, an output coupling unit, and a detection control unit; the antenna signal is input to the input end of the input coupling unit, the first output end of the input coupling unit is connected with the signal end of the orthogonal trap unit, the second output end of the input coupling unit is connected with the input end of the detection control unit, and the orthogonal trap unit is used for executing orthogonal trap on the antenna signal after receiving a control command output by the detection control unit and transmitting the obtained useful signal to the output coupling unit. The utility model discloses an orthogonality trapped wave unit and detection control unit, after receiving the control command that detection control unit exported the orthogonality trapped wave unit carries out the orthogonality trapped wave to antenna signal to will obtain useful signal transmission to output coupling unit, realized the low-loss transmission to useful signal and to interference signal's reflection suppression.
Description
Technical Field
The utility model relates to an antenna signal filtering processing technology field especially relates to a many quadrature trapper of self-adaptation.
Background
Due to the rapid development and widespread use of current communication technologies, wifi, bluetooth, communication phones, broadcasting, and the like, which are seen everywhere in daily life, and strong interference (including unintentional and malicious interference signals) exists in various communications and electronic countermeasures, anti-interference measures and technologies become increasingly important.
For the current anti-interference technology, the field strength of a received signal is not increased (such as the strength of a transmitted signal is enhanced or the gain of an antenna is increased), interference signals are shielded and isolated, and the filtering processing of the interference signals is performed at the front end of a receiving system. The filtering process at the front end of the system conventionally adopts a filter mode to perform filtering (such as a narrow-band processing technology). The filter processing mode has a certain passband and stopband isolation problem, can greatly narrow usable signal bandwidth, and cannot solve the interference problem in the passband of the filter. The filtering mode is not perfect especially for the interference signal under the broadband condition: usually, a band of a channel is filtered and suppressed, and at this time, the signal bandwidth can only be on the filtering passband (the band of the stopband belongs to the blocking and suppressing state and cannot be used for communication; if it is needed, the frequency is switched to change the filter band). The adoption of a multi-stage and multi-filter combined filtering mode to enhance the filtering of interference signals inevitably brings more complicated circuit design, relevant reliability and other problems to a receiver circuit; meanwhile, the prior art can not effectively filter unknown interference signals, and has the problems of large pass-band loss, communication quality reduction caused by too large pass-band loss and the like when the anti-interference problem is solved by adopting a narrow-band technology individually.
Therefore, there is a need in the industry to develop a method or apparatus for performing automatic filtering processing on an unknown interference signal without affecting full-band operation.
SUMMERY OF THE UTILITY MODEL
The problem of filtering is suppressed to the unified channel of a pair of certain frequency band of filtering mode to interfering signal that prior art exists, the utility model provides a self-adaptation many units quadrature trapper.
The specific scheme of the application is as follows:
an adaptive multi-element orthogonal trap comprising: an input coupling unit, an orthogonal notch unit, an output coupling unit, and a detection control unit; an antenna signal is input to an input end of the input coupling unit, a first output end of the input coupling unit is connected with a signal end of the orthogonal trap unit, a second output end of the input coupling unit is connected with an input end of the detection control unit, an output end of the detection control unit is connected with a control end of the orthogonal trap unit, an output end of the orthogonal trap unit is connected with an input end of the output coupling unit, and an output end of the output coupling unit is connected with the receiver; the output end of the output coupling unit and the output end of the receiver are both connected with the detection control unit; and the orthogonal notch unit is used for executing orthogonal notch on the antenna signal after receiving the control instruction output by the detection control unit and transmitting the obtained useful signal to the output coupling unit.
Preferably, the input coupling unit is a coupler; an antenna signal is input to one end of a primary coil of a coupler, the other end of the primary coil of the transformer is connected with a signal end of the orthogonal trap unit, one end of a secondary coil of the coupler is connected to the ground, the other end of the secondary coil of the coupler is connected to the ground through a resistor, and the other end of the secondary coil of the coupler is connected with an input end of the detection control unit.
Preferably, the detection control unit comprises an amplifier, an a/D converter and a processor which are connected in sequence; the other end of the coupler secondary coil is connected with the input end of the amplifier, and the output end of the processor is connected with the control end of the quadrature trap unit.
Preferably, the quadrature notch unit includes: a quadrature bridge and two identical tunable resonators; the first output end of the input coupling unit is connected with the input end of the quadrature bridge; the output end of the orthogonal bridge is connected with the input end of the output coupling unit, and the positive phase-shifting end and the negative phase-shifting end of the orthogonal bridge are respectively connected with the two tunable resonators.
Preferably, the quadrature bridge comprises: the phase shifter comprises a magic T transformer and two phase shifters, wherein the two phase shifters have the same network structure but have different element values of corresponding elements; the two phase shifters are respectively connected to a positive phase shifting end and a negative phase shifting end of the magic T transformer, the first output end of the input coupling unit is connected with the input end of the magic T transformer, the output end of the magic T transformer is connected with the input end of the output coupling unit, and the output ends of the two phase shifters are respectively connected to the two adjustable resonators.
Preferably, the magic T transformer includes: a first transformer, a second transformer and a third transformer; the phase shifter comprises a first capacitor, a second capacitor, a first inductor and a second inductor; the first inductor is a coupling inductor; one end of a primary coil of the first transformer is connected to the ground, one end of a secondary coil of the first transformer is connected with the first output end of the input coupling unit, the other end of the primary coil of the first transformer is connected with one end of a primary coil of the second transformer and the other end of a primary coil of the third transformer, the other end of the primary coil of the second transformer and the other end of the secondary coil of the third transformer are connected with the input end of the output coupling unit, one end of a secondary coil of the second transformer and one end of a primary coil of the third transformer are connected to the ground, and the other end of the secondary coil of the first transformer is connected with one end of a secondary coil of the third transformer and the other end of a secondary coil of the second transformer; one end of a primary coil of the second transformer and one end of a secondary coil of the third transformer are respectively connected with the two tunable resonators through the first capacitor, two ends of the first inductor are connected to two ends of the first capacitor, and the middle end of the first inductor is connected to the ground through the second inductor and the second capacitor in sequence.
Preferably, the tunable resonator comprises a third inductance, a fourth inductance and a third capacitance; the fourth inductor is a coupling inductor, and the third capacitor is a variable capacitor; one end of a primary coil of the second transformer and one end of a secondary coil of the third transformer are respectively connected with one end of a third inductor through a first capacitor, the other end of the third inductor is connected with the middle end of a fourth inductor, two ends of the fourth inductor are connected through the third capacitor, and one end of the fourth inductor is further connected to the ground.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses an orthogonality trapped wave unit and detection control unit, after receiving the control command that detection control unit exported the orthogonality trapped wave unit carries out the orthogonality trapped wave to antenna signal to will obtain useful signal transmission to output coupling unit, realized the low-loss transmission to useful signal and to interference signal's reflection suppression. The automatic trap processing of unknown interference signals is perfectly realized under the condition of not influencing the full-frequency-band operation. The utility model discloses a can be applied to carrier-based communication system's radio station receiver, can show the reception performance, the reinforcing reception communication effect that restrain short wave radio station reception interference signal, improve the receiver, improve the speech radio station's speech quality.
Drawings
Fig. 1 is a schematic block diagram of an adaptive multi-component orthogonal wave trap according to the present invention.
Fig. 2 is a circuit diagram of the input coupling unit and the detection control unit of the present invention.
FIG. 3 is a schematic diagram of a quadrature notch unit of the present invention.
Fig. 4 is a circuit diagram of the magic T transformer of the present invention.
Fig. 5 is a circuit diagram of the phase shifter of the present invention.
Fig. 6 is a circuit diagram of a quadrature bridge according to the present invention.
Fig. 7(a) is a circuit diagram of a conventional series resonance.
Fig. 7(b) is a circuit diagram of a conventional parallel resonance.
Fig. 8 is a schematic diagram of the tunable resonator of the present invention.
Fig. 9 is a circuit diagram of a quadrature notch unit according to the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
The scheme adopts the detection control unit to identify complex and changeable interference signals, utilizes the simplest LC resonance reflection type trap filter, and realizes effective trap filtering (the trap amplitude is more than 20 dB) on the interference signals in an orthogonal trap mode. Therefore, on the basis of ensuring that the broadband full-screen section can be normally used without reducing the receiving quality of the receiver, the received signal is sampled and detected, the targeted trapped wave is realized, and the interference signal can be effectively identified, filtered and reduced by more than 100 times, so that the unknown interference signal is suppressed without changing the channel bandwidth of communication and switching the frequency band of the system, and the effect of improving the communication quality is achieved. The specific scheme is as follows:
referring to fig. 1, an adaptive multi-element orthogonal trap includes: an input coupling unit, an orthogonal notch unit, an output coupling unit, and a detection control unit; an antenna signal is input to an input end of the input coupling unit, a first output end of the input coupling unit is connected with a signal end of the orthogonal trap unit, a second output end of the input coupling unit is connected with an input end of the detection control unit, an output end of the detection control unit is connected with a control end of the orthogonal trap unit, an output end of the orthogonal trap unit is connected with an input end of the output coupling unit, and an output end of the output coupling unit is connected with the receiver; the output end of the output coupling unit and the output end of the receiver are both connected with the detection control unit; and the orthogonal notch unit is used for executing orthogonal notch on the antenna signal after receiving the control instruction output by the detection control unit and transmitting the obtained useful signal to the output coupling unit.
In the present embodiment, referring to fig. 2, the input coupling unit is a coupler OC; an antenna signal is input to one end of a coupler OC primary coil, the other end of the transformer primary coil is connected with a signal end of the quadrature trap unit, one end of a coupler OC secondary coil is connected to the ground, the other end of the coupler OC secondary coil is connected to the ground through a resistor R, and the other end of the coupler OC secondary coil is connected with an input end of the detection control unit. The detection control unit comprises an amplifier AMP, an A/D converter and a processor ARM which are connected in sequence; the other end of the secondary coil of the coupler OC is connected with the input end of the amplifier AMP, and the output end of the processor ARM is connected with the control end of the quadrature trap unit. The scheme adopts a radio frequency direct sampling method, a small signal is output through a coupler OC, proper amplification is carried out through an AMP (amplifier AMP) circuit, sampling is carried out through a digital-to-analog conversion circuit, and finally the signal is output to an ARM for relevant control processing. In practical design, the coupling output power can be changed by adjusting the secondary winding number N of the coupler OC to be smaller than the maximum unsaturated input power value of the analog-to-digital converter.
The output coupling unit and the input coupling unit have the same circuit, and the output coupling unit is a coupler.
Coupling an antenna signal received by an antenna to a small signal (coupled signal) through a coupler OC of an input coupling unit, and then sending the small signal to a detection control unit; the detection control unit adopts a broadband scanning technology to sequentially amplify and perform analog-to-digital conversion on the coupling signals, FFT analysis processing is performed on AD data after the analog-to-digital conversion, strong interference frequency point information is screened out and transmitted to the processor ARM for processing, the processor ARM outputs control signals to the orthogonal trap wave unit according to the frequency point amplitude, and the orthogonal trap wave unit performs trap wave. After the antenna signal is accessed into the multi-path notch unit, the notch effect can be confirmed through the output coupling circuit, and parameter optimization adjustment is carried out through the detection control unit again until the receiving channel state reaches the relatively optimal state, so that the self-adaptive notch process is completed.
In this embodiment, as shown in fig. 3, the quadrature notch unit includes: a quadrature bridge 11 and two identical tuneable resonators 12; the first output end of the input coupling unit is connected with the input end A of the quadrature bridge 11; the output end B of the quadrature bridge 11 is connected to the input end of the output coupling unit, and the positive phase shift end C and the negative phase shift end D of the quadrature bridge 11 are respectively connected to the two tunable resonators 12.
The working principle of the orthogonal notch unit for notching is as follows: the antenna receiving the signal (including the frequency f)0Of useful signal and frequency f1The interference signal of (a); ) The input signal is input from the input end of the quadrature bridge 11, distributed to the positive phase shift end C and the negative phase shift end D of the quadrature bridge 11 by the equal power quadrature phase, and then transmitted to the two tunable resonators 12; by means of a tuneable resonator 12 at frequency f1The resonance occurs nearby, the reflection of the interference signals of the two resonators at the frequency is in a constant amplitude and reverse Phase relation (namely Mag (S (1,1)) -Mag (S (2,2)), Phase (S (1,1)) -Phase (S (2,2)) -180 degrees), the reflection characteristics of the useful signals outside the resonance bandwidth are in a constant amplitude and in Phase relation (namely Mag (S (1,1)) -Mag (S (2,2)), Phase (S (1,1)) -Phase (S (2,2) — 0 degrees), therefore, the interference signals are reflected by the resonators and then combined and output in Phase at the input end of the quadrature bridge 11, no output is provided at the output end of the quadrature bridge 11, the reflection suppression of the interference signals by the trap unit is realized, and the two paths of the useful signals are in a constant amplitude and in Phase relation and combined and output in Phase at the output end of the quadrature bridge 11 because the frequency of the useful signals is outside the resonance bandwidth, and no output is arranged at the input end, so that the trap unit realizes reflection-free transmission of the useful signal.
In this embodiment, as shown in fig. 4, the quadrature bridge 11 includes: the phase shifter comprises a magic T transformer and two phase shifters, wherein the two phase shifters have the same network structure but have different element values of corresponding elements; the two phase shifters are respectively connected to a positive phase shifting end C and a negative phase shifting end D of the magic T transformer, the first output end of the input coupling unit is connected to the input end of the magic T transformer, the output end of the magic T transformer is connected to the input end of the output coupling unit, and the output ends of the two phase shifters are respectively connected to the two tunable resonators 12. Because the phase difference of the output of the two equal-power split ends (the positive phase-shifting end C and the negative phase-shifting end D) of the magic T transformer is 180 degrees instead of +/-90 degrees of the quadrature bridge 11, a pair of phase shifters with the phase difference of 90 degrees is connected into the two split ends to realize the 'quadrature' phase characteristic relation. In addition, when the impedances of the four ports of the magic T transformer are not uniform, the impedances of the corresponding ports need to be transformed to match the system impedance. According to the theory of a theoretical transmission line transformer, in order to realize the optimization of the distribution and the combination performance of the same power and phase, a three-transformer magic T design mode is adopted.
In this embodiment, the magic T transformer includes: a first transformer T1, a second transformer T2, and a third transformer T3; the phase shifter comprises a first capacitor C1 ', a second capacitor C2', a first inductor L1 'and a second inductor L2'; the first inductor L1' is a coupled inductor; one end of the primary coil of the first transformer T1 is connected to ground, one end of the secondary coil of the first transformer T1 is connected to the first output end of the input coupling unit, the other end of the primary coil of the first transformer T1 is connected to one end of the primary coil of the second transformer T2, and the other end of the primary coil of the third transformer T3 are connected, the other end of the primary coil of the second transformer T2 and the other end of the secondary coil of the third transformer T3 are connected to the input end of the output coupling unit, one end of the secondary coil of the second transformer T2 and one end of the primary coil of the third transformer T3 are connected to ground, and the other end of the secondary coil of the first transformer T1 is connected to one end of the secondary coil of the third transformer T3 and the other end of the secondary coil of the second transformer T2; one end of the primary winding of the second transformer T2 and one end of the secondary winding of the third transformer T3 are both connected to the two tunable oscillators 12 through a first capacitor C1 ', two ends of a first inductor L1' are connected to two ends of a first capacitor C1 ', and the middle end of the first inductor L1' is connected to ground through a second inductor L2 'and a second capacitor C2' in sequence.
The differential phase shift network is a two-stage all-pass phase shift network as shown in FIG. 5, wherein f is the difference between the resonance frequency of the serial arm and the resonance frequency of the parallel arm0＝L1·C1＝L2·C2The phase shift is monotonous with the frequency, and the coefficient m is set to a proper value (m ═ L)2/L1＝C2/C1) The slope change of the phase shift-frequency relation curve can be small, which has very important significance for the phase shift network to work in a wide frequency band. With the same network structure but with component valuesThe m and f of two different phase shift networks can be calculated by design indexes1And f2And then the corresponding element values are obtained, so that the phase shift difference of the two phase shift networks is kept approximately pi/2 in the required frequency range. Theoretical values of the phase-shifting network with the difference phase shift of 90 degrees +/-3 degrees in the short-wave frequency band can be obtained through theoretical calculation.
Based on the previous analysis, the magic-T transformer and phase shifter described above can be combined to form a quadrature bridge 11, as shown in FIG. 6.
In this embodiment, the tunable resonator 12 includes a third inductor L3 ', a fourth inductor L4 ', and a third capacitor C3 '; the fourth inductor L4 'is a coupling inductor, and the third capacitor C3' is a variable capacitor; one end of the primary winding of the second transformer T2 and one end of the secondary winding of the third transformer T3 are connected to one end of a third inductor L3 ' through a first capacitor C1 ', the other end of the third inductor L3 ' is connected to the middle end of a fourth inductor L4 ', the two ends of the fourth inductor L4 ' are connected to the third capacitor C3 ', and one end of the fourth inductor L4 ' is also connected to ground.
Design of the tunable resonator 12: there are two main implementations of the tuner, series resonance and parallel resonance, as shown in fig. 7(a) and 7 (b). Wherein r is the parasitic resistance on the inductor; because the Q value of the capacitor is far higher than that of the inductor, the capacitor is assumed to be an ideal device and has no parasitic resistance.
From the circuit analysis theory, it is known that the resonance impedance at the time of series resonance is Z0R, since r is a parasitic resistance on the inductor L, which is generally very small (< 1 Ω), the real part of the impedance of the series resonant circuit near the resonant frequency is much less than 50 ohms, and it is difficult to achieve impedance matching near the resonant frequency through a transformer; meanwhile, the impedance Z0 at resonance of the parallel resonant circuit is L/(C · r) and is high-impedance with respect to the series impedance, so that impedance matching near the resonance frequency can be easily achieved. The parallel resonance mode is therefore selected as the resonator design.
According to the above analysis, the impedance transformation ratio of the parallel resonant circuit is realized by tapping the inductor, and the impedance imaginary part is offset by adding the series inductor, so that the impedance matching of the parallel resonant circuit at the resonant frequency accessory can be finally realized, as shown in fig. 8, and the adjustable function is realized by changing the capacitance value of the resonator.
The positive phase shift terminal C and the negative phase shift terminal D of the quadrature bridge 11 are connected to the tunable parallel resonator as shown in fig. 9, thereby realizing a quadrature notch unit.
A trap method of the adaptive multi-element orthogonal trap based on the adaptive multi-element orthogonal trap comprises the following steps:
s1, the input coupling unit couples the signal out of the coupling signal and transmits the coupling signal to the detection control unit and the orthogonal notch unit respectively;
s2, the detection control unit sequentially amplifies and converts the coupling signals, and the processor ARM judges the signals after the analog-digital conversion; if the signal after the analog-to-digital conversion is determined to contain the interference signal, executing step S3;
s3, the processor ARM outputs a control instruction to the orthogonal notch unit according to the judgment result;
s4, the orthogonal notch unit carries out notch on the coupling signal according to the control command;
s5, the quadrature notch unit outputs a notch signal, which is coupled to the receiver via the output coupling unit.
In the present embodiment, step S4 includes:
s41, after the antenna signal is input to the input end a of the quadrature bridge 11, the antenna signal is distributed to the positive phase-shift end C and the negative phase-shift end D of the quadrature bridge 11 by the equal-power quadrature phase, and then transmitted to the two tunable resonators 12, respectively; wherein the antenna signal comprises a frequency f0Of useful signal and frequency f1The interference signal of (a);
s42, the antenna signal is at frequency f in the tunable resonator 121Nearby resonance occurs, and the interference signals of the two adjustable resonators 12 are at the frequency f1The reflection of the two tunable resonators 12 has a 'constant amplitude and phase reversal' relationship, and the useful signals of the two tunable resonators 12 are at the frequency f1The reflection at the position has the relation of equal amplitude and same phase;
s43, the interference signals at two positions are reflected by the tunable resonator 12 and then combined in phase at the input end a of the quadrature bridge 11 for output, and the useful signals at two positions are reflected by the tunable resonator 12 and then combined in phase at the output end B of the quadrature bridge 11 for output to the output coupling unit.
In this embodiment, if it is determined that the signal after the analog-to-digital conversion does not include the interference signal, the processor ARM does not output the control command, and the coupling signal is transmitted to the receiver through the orthogonal notch unit and the output coupling unit in sequence.
In conclusion, although the adaptive multi-element orthogonal trap filter is developed based on the front-end filtering processing technology, the adaptive multi-element orthogonal trap filter can ensure that target-type trap suppression is performed on interference signals under the condition of broadband radio frequency communication, not only can the phase amplitude of communication frequency be unchanged, but also effective trap processing can be realized on the interference signals under the condition that the broadband communication quality is not influenced, and the anti-interference capability of a receiver is improved.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. An adaptive multi-element orthogonal trap, comprising: an input coupling unit, an orthogonal notch unit, an output coupling unit, and a detection control unit;
an antenna signal is input to an input end of the input coupling unit, a first output end of the input coupling unit is connected with a signal end of the orthogonal trap unit, a second output end of the input coupling unit is connected with an input end of the detection control unit, an output end of the detection control unit is connected with a control end of the orthogonal trap unit, an output end of the orthogonal trap unit is connected with an input end of the output coupling unit, and an output end of the output coupling unit is connected with the receiver; the output end of the output coupling unit and the output end of the receiver are both connected with the detection control unit;
and the orthogonal notch unit is used for executing orthogonal notch on the antenna signal after receiving the control instruction output by the detection control unit and transmitting the obtained useful signal to the output coupling unit.
2. The adaptive multi-element orthogonal trap of claim 1, wherein the input coupling unit is a coupler; an antenna signal is input to one end of a primary coil of a coupler, the other end of the primary coil of the transformer is connected with a signal end of the orthogonal trap unit, one end of a secondary coil of the coupler is connected to the ground, the other end of the secondary coil of the coupler is connected to the ground through a resistor, and the other end of the secondary coil of the coupler is connected with an input end of the detection control unit.
3. The adaptive multi-element orthogonal trap of claim 2, wherein the detection control unit comprises an amplifier, an a/D converter and a processor connected in sequence;
the other end of the coupler secondary coil is connected with the input end of the amplifier, and the output end of the processor is connected with the control end of the quadrature trap unit.
4. The adaptive multi-element orthogonal trap of claim 1, wherein the orthogonal trap comprises: a quadrature bridge and two identical tunable resonators;
the first output end of the input coupling unit is connected with the input end of the quadrature bridge; the output end of the orthogonal bridge is connected with the input end of the output coupling unit, and the positive phase-shifting end and the negative phase-shifting end of the orthogonal bridge are respectively connected with the two tunable resonators.
5. The adaptive multi-element quadrature trap of claim 4, wherein the quadrature bridge comprises: the phase shifter comprises a magic T transformer and two phase shifters, wherein the two phase shifters have the same network structure but have different element values of corresponding elements;
the two phase shifters are respectively connected to a positive phase shifting end and a negative phase shifting end of the magic T transformer, the first output end of the input coupling unit is connected with the input end of the magic T transformer, the output end of the magic T transformer is connected with the input end of the output coupling unit, and the output ends of the two phase shifters are respectively connected to the two adjustable resonators.
6. The adaptive multi-element quadrature trap of claim 5, wherein the magic T transformer comprises: a first transformer, a second transformer and a third transformer; the phase shifter comprises a first capacitor, a second capacitor, a first inductor and a second inductor; the first inductor is a coupling inductor;
one end of a primary coil of the first transformer is connected to the ground, one end of a secondary coil of the first transformer is connected with the first output end of the input coupling unit, the other end of the primary coil of the first transformer is connected with one end of a primary coil of the second transformer and the other end of a primary coil of the third transformer, the other end of the primary coil of the second transformer and the other end of the secondary coil of the third transformer are connected with the input end of the output coupling unit, one end of a secondary coil of the second transformer and one end of a primary coil of the third transformer are connected to the ground, and the other end of the secondary coil of the first transformer is connected with one end of a secondary coil of the third transformer and the other end of a secondary coil of the second transformer;
one end of a primary coil of the second transformer and one end of a secondary coil of the third transformer are respectively connected with the two tunable resonators through the first capacitor, two ends of the first inductor are connected to two ends of the first capacitor, and the middle end of the first inductor is connected to the ground through the second inductor and the second capacitor in sequence.
7. The adaptive multi-element orthogonal trap of claim 6, wherein the tunable resonator comprises a third inductance, a fourth inductance, and a third capacitance; the fourth inductor is a coupling inductor, and the third capacitor is a variable capacitor;
one end of a primary coil of the second transformer and one end of a secondary coil of the third transformer are respectively connected with one end of a third inductor through a first capacitor, the other end of the third inductor is connected with the middle end of a fourth inductor, two ends of the fourth inductor are connected through the third capacitor, and one end of the fourth inductor is further connected to the ground.
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| CN111030625A (en) * | 2019-12-30 | 2020-04-17 | 广州海格通信集团股份有限公司 | Self-adaptive multi-element orthogonal wave trap and wave trapping method thereof |
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| CN111030625A (en) * | 2019-12-30 | 2020-04-17 | 广州海格通信集团股份有限公司 | Self-adaptive multi-element orthogonal wave trap and wave trapping method thereof |
| CN111030625B (en) * | 2019-12-30 | 2023-08-01 | 广州海格通信集团股份有限公司 | Self-adaptive multi-element orthogonal wave trap and wave trapping method thereof |
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