CN117977145A - Microstrip coupling line non-magnetic circulator based on time modulation - Google Patents
Microstrip coupling line non-magnetic circulator based on time modulation Download PDFInfo
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Abstract
The invention discloses a microstrip coupling line magnetic-ring-free circulator based on time modulation, which comprises: the three time-varying resonators are distributed on the dielectric substrate in a Y-shaped connection mode, and the metal ground is positioned at the bottom of the dielectric substrate; each time-varying resonator comprises a section of radio frequency signal input feeder line, a coupling line, a multi-stage branch circuit with an open terminal, a first varactor diode, a second varactor diode, a pi-type lumped low-pass filter and a modulation signal input feeder line, wherein the first varactor diode and the second varactor diode are connected in series in a reverse direction. According to the magnetic ring-free type resonator, the multi-order open-circuit branches are introduced at one end of the coupled line resonator structure, and the time modulation circuit for loading the two serially-connected varactors is introduced at the other end of the coupled line resonator structure, so that the magnetic ring-free type resonator with the characteristics of low insertion loss, high isolation, large isolation bandwidth, small volume, light weight, easiness in integration, high flexibility and the like is finally realized.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a microstrip coupling line magnetic-ring-free circulator based on time modulation.
Background
With the rapid development of wireless communication and internet of things, the number of transceiver antennas required in wireless communication devices is increasing, and the increase of the number of antennas is not beneficial to improving the integration level of the communication devices. At the same time, the increased number of antennas will complicate their coupling interference with each other, thereby degrading the quality of wireless communication. Based on this, it becomes more important to realize multiplexing of the transmitting and receiving antennas. The multiplexing of the receiving and transmitting antennas is simply that a receiver and a transmitter of a wireless system can realize the wireless receiving and transmitting function of the system through one antenna. It can be seen that if multiplexing of the receiving and transmitting antennas can be realized, the number of antennas used in the wireless communication device is greatly reduced, the integration level of the system is improved, the coupling interference among the antennas is reduced, and the wireless communication quality is improved.
In fact, multiplexing of transceiving antennas in a wireless communication device may be implemented by a circulator. However, most of the circulators currently implemented are made of ferromagnetic materials, and these circulators are relatively large in size and weight and relatively high in cost. In addition, the circulator made of ferromagnetic materials is difficult to integrate, and a new obstacle is encountered in the aspect of improving the integration level of the wireless communication equipment. Based on this, the scholars propose the concept of a nonmagnetic circulator and different implementations.
Until now, researchers have realized magnetic-ring-free devices by using a method of combining switch transmission lines, but this technology has certain limitations, such as a large insertion loss, and the requirement for the switching speed of the switch is increasing with the increase of the operating frequency. In recent years, researchers have proposed a magnetic loop-free device that can be realized with low insertion loss, high isolation, and easy integration by time-modulating a lumped LC resonator. However, the lumped LC has unstable operating characteristics and a narrow operating bandwidth at higher frequencies due to an increase in insertion loss at high frequencies and an increase in parasitic inductance and capacitance effects. The microstrip line belongs to a distributed parameter circuit, and the high-frequency loss is small, so that the time modulation magnetic-ring-free device is designed by utilizing the advantages of the microstrip line and has practical value.
Disclosure of Invention
The invention aims to: in order to solve the problems in the prior art, the invention provides a microstrip coupling line magnetic-ring-free circulator based on time modulation.
The technical scheme is as follows: the invention provides a time modulation-based microstrip coupling line magnetic ring-free circulator, which comprises a dielectric substrate, three time-varying resonators with the same structure and uniformly distributed on the dielectric substrate in a Y-shaped connection mode, and a metal ground positioned at the bottom of the dielectric substrate; the time-varying resonator comprises a first bonding pad, a second bonding pad, a first inductor, a multi-stage branch circuit with an open terminal, a coupling line, a radio frequency signal input feeder line, a pi-type lumped low-pass filter, a modulation signal input feeder line, a first varactor, a second varactor and a first T-shaped bonding pad, wherein the first bonding pad, the second bonding pad, the first inductor, the multi-stage branch circuit with an open terminal, the coupling line, the radio frequency signal input feeder line, the modulation signal input feeder line, the first varactor, the second varactor and the first T-shaped bonding pad comprise a first port, a third port, the third port is a middle end, and the first port and the second port are opposite left port and right port; the coupling line comprises a first strip and a second strip; the first strips are arranged above the second strips in parallel, the terminals of the three second strips are connected in a Y-shaped connection mode and then connected with the first bonding pad through a first inductor, the initial end of the second strips is connected with the positive electrode of a first varactor, the negative electrode of the first varactor is connected with the first port of a first T-shaped bonding pad, the third port of the first T-shaped bonding pad is connected with a pi-shaped lumped low-pass filter, the second port of the first T-shaped bonding pad is connected with the negative electrode of a second varactor, the positive electrode of the second varactor is connected with the second bonding pad, one end of the first strip, which is close to the Y-shaped connection position of the second strips, is provided with a multi-stage branch circuit with an open terminal, the other end of the first strip is connected with one end of a radio frequency signal input feeder, and the other end of the radio frequency signal input feeder is connected with a radio frequency input signal; the modulation signal input feeder is used as a modulation signal input port of the time-varying resonator, one end of the modulation signal input feeder is connected with a time modulation signal, and the other end of the modulation signal input feeder is connected with pi-type lumped low-pass filtering.
Further, the multi-stage branch circuit with the open terminal is a high-low impedance resonator, and the multi-stage branch circuit with the open terminal is bent for a plurality of times.
Further, the pi-type lumped low-pass filter comprises a second inductor, a second T-shaped pad, a third T-shaped pad, a fourth pad, a first capacitor and a second capacitor, wherein the third T-shaped pad and the fourth pad are provided with metallized through holes, a first port of the second T-shaped pad is connected with a modulation signal input feeder line, a second port of the second T-shaped pad is connected with a first port of the third T-shaped pad through the second inductor, a second port of the third T-shaped pad is connected with a third port of the first T-shaped pad, a third port of the second T-shaped pad is connected with the third pad through the first capacitor, and a third port of the third T-shaped pad is connected with the fourth pad through the second capacitor.
Furthermore, the nonmagnetic circulator is wholly in a regular hexagon shape.
Further, the annular direction of the non-magnetic ring device is changed by changing the phase relation of the input alternating current modulation signal, specifically: when the initial phases of the alternating current modulation signals input by the three modulation signal input ports are in anticlockwise increment, and the increment amplitude of two adjacent ports is 120 degrees, the annular direction of the non-magnetic annular device is anticlockwise; when the initial phase of the alternating current modulation signal input by the three modulation signal input ports is increased clockwise and the increasing amplitude of the two adjacent ports is 120 degrees, the annular direction of the non-magnetic annular device is clockwise.
The beneficial effects are that: according to the invention, through loading of the multi-stage branch circuit with the open terminal, a transmission zero is introduced outside the band, so that the out-of-band inhibition capability of the circulator is improved, and the isolation bandwidth of the circulator is widened; in addition, the multi-stage branch circuit with the open terminal is bent for a plurality of times, so that the size of the device is reduced. The introduction of the lumped pi-type low-pass filter can effectively prevent radio frequency signals in the isolation frequency band range from leaking from the modulation signal input feeder. By means of the two first varactors and the second varactors which are connected in series in the opposite direction, the leakage of radio frequency signals in the circuit is prevented while the loading of direct current bias signals and alternating current modulation signals is facilitated. The invention prevents radio frequency signals within the range of the isolation zone from leaking through a grounding path while providing grounding for the first varactor and the second varactor which are connected in reverse series. The invention has the characteristics of low insertion loss, high isolation, large isolation bandwidth, small volume, light weight, easy integration, high use flexibility and the like.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
Fig. 2 is a schematic diagram of a microstrip feed port of a microstrip coupling line nonmagnetic circulator based on time modulation provided by the invention;
Fig. 3 is a schematic diagram of a circuit structure of an upper layer of a dielectric substrate of a microstrip coupling line nonmagnetic circulator based on time modulation;
Fig. 4 is an S-parameter response curve of a pi-type lumped low-pass filter of a microstrip coupling line magnetic-ring-free device based on time modulation;
Fig. 5 is an S-parameter response curve of three radio frequency signal input ends when the microstrip coupling line nonmagnetic circulator based on time modulation provided by the invention loads only a proper dc bias signal but not an ac modulation signal at the three modulation signal input ends;
fig. 6 is an S-parameter response curve of three radio frequency signal input ends when the microstrip coupling line nonmagnetic circulator based on time modulation is loaded with a proper dc bias signal and a proper ac modulation signal at the same time;
Fig. 7 is a response curve of isolation of three radio frequency signal input ends when the microstrip coupling line nonmagnetic circulator based on time modulation is loaded with a proper direct current bias signal and a proper alternating current modulation signal at the same time.
Reference numerals illustrate:
1. A dielectric substrate; 2. a time-varying resonator; 3. a metal land; 4. a radio frequency signal input feeder; 5. a first strip; 6. a second strip; 7. a multi-stage branch circuit with an open terminal; 8. a first varactor; 9. a second varactor; 10. a second inductor; 11. a first capacitor; 12. a second capacitor; 13. a pi-type lumped low pass filter; 14. a modulation signal input feed line; 15. y-shaped connection parts of the second strips; 16. a first inductance; 17. a first bonding pad; 18. a first metallized via; 19. a first T-shaped bonding pad; 20. a second bonding pad; 21. a second metallized via; 22. a third bonding pad; 23. a third metallized via; 24. a second T-shaped bonding pad; 25. a fourth pad; 26. a fourth metallized via; 27. and a third T-shaped bonding pad.
Detailed Description
In this embodiment, as shown in fig. 1, the overall structure of the circulator is a regular hexagon, and the circulator comprises a dielectric substrate 1, three time-varying resonators 2 which have the same structure and are uniformly distributed on the dielectric substrate in a Y-shaped connection manner, and a metal ground 3 positioned at the bottom of the dielectric substrate; the time-varying resonator comprises a first bonding pad 17 and a second bonding pad 20 which are provided with metallized through holes, a first inductor 16, a multi-stage branch circuit 7 with an open terminal, a coupling line, a radio frequency signal input feeder line 4, a pi-type lumped low-pass filter 13, a modulation signal input feeder line 14, a first varactor 8, a second varactor 9 and a first T-shaped bonding pad 19, wherein the T-shaped bonding pad comprises first to three ports, a third port is a middle end, and the first port and the second port are opposite left and right ends; the coupling line comprises a first strip 5 and a second strip 6, wherein the first strip 5 is arranged above the second strip 6 in parallel, the terminals of the three second strips are connected in a Y-shaped connection mode and then are connected with the first pad 17 through a first inductor 16, the terminals are short-circuited to the metal ground 3 through a first metalized through hole 18, the starting end of the second strip 6 is connected with the positive electrode of a first varactor 8, the negative electrode of the first varactor 8 is connected with a first port of a first T-shaped pad 19, the third port of the first T-shaped pad 19 is connected with a pi-shaped lumped low-pass filter, the second port of the first T-shaped pad 19 is connected with the negative electrode of a second varactor 9, the positive electrode of the second varactor 9 is connected with a second pad 20, the first end of the first strip 5, which is close to a Y-shaped connection part 15 of the second strip, is loaded with an open-circuited multi-branch circuit 7 of the terminal, and the other end of the first strip 5 is connected with one end of a radio frequency signal input feeder 4, and the other end of the radio frequency signal input 4 is connected with the other end of the radio frequency signal input 4; one end of the modulation signal input feeder line 14 is connected with a time modulation signal, and the other end is connected with a pi-type lumped low-pass filter 13.
The pi-type lumped low-pass filter comprises a second inductor 10, a second T-shaped bonding pad 24, a third T-shaped bonding pad 27, a third bonding pad 22 provided with a metalized through hole, a fourth bonding pad 25 provided with a metalized through hole, a first capacitor 11 and a second capacitor 12, wherein a first port of the second T-shaped bonding pad 24 is connected with a modulation signal input feeder 14, a second port of the second T-shaped bonding pad 24 is connected with a first port of the third T-shaped bonding pad 27 through the second inductor 10, a second port of the third T-shaped bonding pad 27 is connected with a third port of the first T-shaped bonding pad 19, a third port of the second T-shaped bonding pad 24 is connected with the third bonding pad 22 through the first capacitor 11 and is short-circuited to the metal ground 3 through the third metalized through hole 23, a third port of the third T-shaped bonding pad 27 is connected with the fourth bonding pad 25 through the second capacitor 12 and is short-circuited to the metal ground 3 through the fourth metalized through hole 26.
The open-ended multi-stage branch circuit in this embodiment is a high-low impedance resonator.
In the embodiment, the working characteristics of the circulator are controlled by loading alternating current modulation signals on three modulation signal input feeder lines.
According to the embodiment, the lumped pi-type low-pass filter is introduced, so that radio frequency signals in the isolation frequency band range can be effectively prevented from leaking from the modulation signal input feeder.
In the embodiment, the multi-stage branch circuit with the open-ended terminal loaded at the end, close to the Y-shaped connection, of the first strip of the coupling line in the time-varying resonator forms a ladder impedance resonator structure, and the 20dB isolation bandwidth and the out-of-band rejection capability of the circulator are effectively improved. Meanwhile, in order to reduce the size of the device, the multi-stage branch circuit with the open terminal is bent for a plurality of times. The cathodes of the first varactor diode and the second varactor diode are respectively connected to two ports of the first T-shaped bonding pad to form an inverse series connection structure, and a direct current bias signal and an alternating current modulation signal are applied to the cathode ends of the first varactor diode and the second varactor diode through a pi-type lumped low-pass filter by a modulation signal input feeder line, so that a time modulation effect is realized. Since the first strip and the second strip of the coupled line form a set of parallel coupled line structures, the dc bias applied to the negative terminals of the first varactor and the second varactor connected in anti-series on the terminal of the second strip of the coupled line will not leak to the rf signal input feed. The reason why the positive terminals of the first varactor diode and the second varactor diode are dc grounded is to satisfy the dc reverse bias condition of the varactor diode in use. The circulator has clear structure and clear function of each part, and is convenient for analysis and design.
In this embodiment, three time-varying resonators of the three ports are distributed on the dielectric substrate in a Y-type connection manner through the center, and the ring effect (counterclockwise/clockwise) of the circulator is completely determined by the phases of the input ac modulation signals of the three modulation signal input ports thereof. In order to facilitate the explanation of the operation mode and the operation principle of the circulator, the definition of each port name is as shown in fig. 2: wherein P1 is the radio frequency signal input port of the first time-varying resonator, P1-1 is the modulation signal input port of the first time-varying resonator, P2 is the radio frequency signal input port of the second time-varying resonator, and P2-1 is the modulation signal input port of the second time-varying resonator; p3 is the radio frequency signal input port of the third time-varying resonator, and P3-1 is the modulated signal input port of the third time-varying resonator.
In this example, a Rogers4003C plate with a dielectric constant of 3.55 was used as the dielectric plate, and the thickness was 1.524mm. Specific parameters of the upper layer circuit of the dielectric plate are shown in fig. 3, and specific parameters of the marked part structures are shown in table 1.
TABLE 1
| Parameters (parameters) | W1 | W2 | W3 | W4 | W5 |
| Value of | 0.77 | 4.74 | 0.9 | 3.36 | 3.36 |
| Parameters (parameters) | W6 | W7 | S1 | L1 | L2 |
| Value of | 1.2 | 1.0 | 0.65 | 27.5 | 30.5 |
| Parameters (parameters) | L3 | L4 | L5 | L6 | L7 |
| Value of | 3.0 | 20.0 | 18.0 | 4.0 | 13.0 |
| Parameters (parameters) | L8 | L9 | L10 | L11 | L12 |
| Value of | 16.0 | 12.0 | 7.0 | 12.0 | 5.4 |
| Parameters (parameters) | L13 | L14 | L15 | L16 | L17 |
| Value of | 4.4 | 2.0 | 4.4 | 1.6 | 2.0 |
| Parameters (parameters) | L18 | D1 | D2 | D3 | D4 |
| Value of | 52.54 | 0.8 | 0.8 | 0.8 | 1.0 |
| Parameters (parameters) | R1 | R2 | |||
| Value of | 0.2 | 0.2 |
In this embodiment, since a dc bias signal and an ac modulation signal need to be applied to the negative terminal of the varactor connected in reverse series and loaded on the second strip terminal in the coupling line, in order to avoid leakage of the radio frequency signal from the modulation signal input feeder terminal, a lumped pi-type low-pass filter is connected in series between the modulation signal input feeder terminal and the left port of the first T-type pad, where the low-pass filter is composed of a series inductor (the inductance value is 39nH, the package size is 0603/1.6×0.8 mm) and two first and second parallel capacitors (the capacitance value is 10pF, the package size is 0603/1.6×0.8 mm) with equal capacitance values, and fig. 4 is an S-parameter response curve of the lumped pi-type low-pass filter. The 3dB bandwidth of the lumped low-pass filter is about 350MHz, the passband range of the low-pass filter is far away from the isolation band range of the circulator, and the passband inhibition of the low-pass filter at 700MHz reaches more than 20dB, so that the radio frequency signal in the isolation band range can be effectively prevented from leaking from the modulation signal input feeder line end.
In this embodiment, since a dc bias signal needs to be applied to the serially connected varactors loaded at the second strip terminal of the coupled line to reverse bias the varactors, that is, the positive terminal of the varactors needs to be grounded, and then a dc bias signal needs to be applied to the negative terminal of the varactors. In order to ground the positive electrode of the varactor diode connected in reverse series and prevent radio frequency signals from leaking through a grounding path, a first inductor (the inductance value is 100nH and the package size is 0603/1.6x0.8mm) is connected in series between the center of the Y-shaped connection part and the grounding end.
In this embodiment, the varactor diode selected is an SMV1231-079LF varactor diode, and the loading of two varactor diodes connected in reverse series at the second strip terminal of the coupling line is to apply a modulation signal to the negative terminal of the varactor diode, while preventing leakage of a radio frequency signal in the circuit.
In this embodiment, for convenience of description, the dc bias applied to the modulated signal input ports P1-1, P2-1 and P3-1 and the ac modulated signal are specified by the following designations: the DC bias applied by the modulating signal input port P1-1 and the AC modulating signal are named as Vdc1 and Vac1 respectively; the DC bias applied by the modulating signal input port P2-1 and the AC modulating signal are named as Vdc2 and Vac2 respectively; the dc bias applied by the modulated signal input port P3-1 and the ac modulated signal are designated Vdc3 and Vac3, respectively. The DC bias applied by the modulation signal input ports P1-1, P2-1 and P3-1 and the AC modulation signal are voltage signals. Depending on whether the modulation signal input ports P1-1, P2-1 and P3-1 apply a dc bias signal and an ac modulation signal simultaneously, the circulator may be divided into two states: (1) DC bias state: the state when the modulation signal input ports P1-1, P2-1 and P3-1 apply only the dc bias signal and not the ac modulation signal; (2) ac modulation state: the modulation signal input ports P1-1, P2-1 and P3-1 apply a dc bias signal and an ac modulation signal at the same time. In a direct current bias state, the structure does not have the function of a circulator, and is a reciprocity device at the moment; in the ac modulation state, the structure has the function of a circulator, which is a nonreciprocal device. These two states of the circulator are described below:
When the Vdc1 = Vdc2 = Vdc3 = 3.3V and vac1 = vac2 = vac3 = 0V signals are applied, i.e., the S-parameter response of the circulator rf port is shown in fig. 5 in the dc bias state, the response of the structure is similar to a filter power divider with a passband ranging from 0.94GHz to 1.06GHz, the insertion loss in the passband is about 3.5dB, and the structure in this state does not have the ring function.
When Vdc1 = Vdc2 = Vdc3 = 3.8V; vac1 is a sinusoidal AC voltage signal of 1.4V amplitude, 160MHz frequency and 0 degree initial phase; vac2 is a sinusoidal ac voltage signal of amplitude 1.4V, frequency 160MHz and initial phase 120 degrees; vac3 is a sinusoidal AC voltage signal having an amplitude of 1.4V, a frequency of 160MHz and an initial phase of 240 degrees, the S-parameter response of the circulator RF port is shown in FIG. 6, and the isolation response of the circulator is shown in FIG. 7. At this time, the ports P2 and P3 exhibit a remarkable isolating effect in a certain frequency range, i.e., the structure performs the function of a circulator in a certain frequency range. From simulation results, the 20dB isolation bandwidth of the circulator is about 0.966GHz-1.016GHz, and the absolute bandwidth is about 50MHz; the insertion loss of the forward transmission in the band is about 1.5dB, and the return loss of the port is more than 10dB; in this state, the circuit achieves a good ring function in the counterclockwise direction.
In this embodiment, the ring effect (counter-clockwise: P1→P2→P3→P1/clockwise: P1→P3→P2→P1) of the circulator is completely determined by the phases of the input AC modulation signals of the three modulation signal input ports P1-1, P2-1, P3-1. The phase relationship between two kinds of annular effects (anticlockwise: P1→P2→P3→P1/clockwise: P1→P3→P2→P1) and the corresponding three modulation signal input ports P1-1, P2-1 and P3-1 of the input alternating current modulation signals is as follows:
If the initial phases of the ac modulation signals applied to the three modulation signal input ports P1-1, P2-1 and P3-1 are respectively 0 degrees, 120 degrees and 240 degrees in sequence, i.e., the initial phases of the three input ac modulation signals are increased counterclockwise, and the increasing amplitude of the adjacent two ports is 120 degrees, then the ring effect of the circulator is counterclockwise (i.e., p1→p2→p3→p1).
If the initial phases of the ac modulation signals applied to the three modulation signal input ports P1-1, P3-1 and P2-1 are 0 degrees, 120 degrees and 240 degrees, respectively, in sequence, that is, the phases of the input ac modulation signals of the three modulation signal input ports P1-1, P3-1 and P2-1 are increased clockwise, and the increasing amplitude of the adjacent two ports is 120 degrees, then the ring effect of the circulator is clockwise (i.e., p1→p3→p2→p1).
The relationship between the phases of the input alternating-current modulation signals of the two annular effects (anticlockwise: P1→P2→P3→P1/clockwise: P1→P3→P2→P1) and the corresponding three modulation signal input ports P1-1, P2-1 and P3-1 can be known: the annular effect (anticlockwise: P1→P2→P3→P1/clockwise: P1→P3→P2→P1) of the circulator is completely consistent with the phase increment mode (anticlockwise/clockwise) of 120 degrees of increment amplitude of the adjacent two modulation signal input ports, that is, the annular effect of the circulator can be controlled by changing the initial phase of the input alternating current modulation signal, so that the circulator has higher flexibility and applicability in practical application.
The examples of the present invention are merely for describing the preferred embodiments of the present invention, and are not intended to limit the spirit and scope of the present invention, and those skilled in the art should make various changes and modifications to the technical solution of the present invention without departing from the spirit of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
Claims (5)
1. The microstrip coupling line magnetic-ring-free coupler based on time modulation is characterized by comprising a dielectric substrate, three time-varying resonators which have the same structure and are uniformly distributed on the dielectric substrate in a Y-shaped connection mode, and a metal ground positioned at the bottom of the dielectric substrate; the time-varying resonator comprises a first bonding pad, a second bonding pad, a first inductor, a multi-stage branch circuit with an open terminal, a coupling line, a radio frequency signal input feeder line, a pi-type lumped low-pass filter, a modulation signal input feeder line, a first varactor, a second varactor and a first T-shaped bonding pad, wherein the first bonding pad, the second bonding pad, the first inductor, the multi-stage branch circuit with an open terminal, the coupling line, the radio frequency signal input feeder line, the modulation signal input feeder line, the first varactor, the second varactor and the first T-shaped bonding pad comprise a first port, a third port, the third port is a middle end, and the first port and the second port are opposite left port and right port; the coupling line comprises a first strip and a second strip; the first strips are arranged above the second strips in parallel, the terminals of the three second strips are connected in a Y-shaped connection mode and then connected with the first bonding pad through a first inductor, the initial end of the second strips is connected with the positive electrode of a first varactor, the negative electrode of the first varactor is connected with the first port of a first T-shaped bonding pad, the third port of the first T-shaped bonding pad is connected with a pi-shaped lumped low-pass filter, the second port of the first T-shaped bonding pad is connected with the negative electrode of a second varactor, the positive electrode of the second varactor is connected with the second bonding pad, one end of the first strip, which is close to the Y-shaped connection position of the second strips, is provided with a multi-stage branch circuit with an open terminal, the other end of the first strip is connected with one end of a radio frequency signal input feeder, and the other end of the radio frequency signal input feeder is connected with a radio frequency input signal; the modulation signal input feeder is used as a modulation signal input port of the time-varying resonator, one end of the modulation signal input feeder is connected with a time modulation signal, and the other end of the modulation signal input feeder is connected with pi-type lumped low-pass filtering.
2. The time modulation-based microstrip coupling line magnetic loop-free device according to claim 1, wherein the open-ended multi-stage branch circuit is a high-low impedance resonator, and the open-ended multi-stage branch circuit is bent for a plurality of times.
3. The time modulation-based microstrip coupling line magnetic loop-free device according to claim 1, wherein the pi-type lumped low-pass filter comprises a second inductor, a second T-type pad, a third T-type pad, a fourth T-type pad, a first capacitor and a second capacitor, wherein the third T-type pad and the fourth T-type pad are provided with metallized through holes, a first port of the second T-type pad is connected with a modulation signal input feeder line, a second port of the second T-type pad is connected with a first port of the third T-type pad through the second inductor, a second port of the third T-type pad is connected with a third port of the first T-type pad, a third port of the second T-type pad is connected with the third T-type pad through the first capacitor, and a third port of the third T-type pad is connected with the fourth pad through the second capacitor.
4. The time-modulated microstrip coupling line magnetic-free loop as claimed in claim 1, wherein the magnetic-free loop is in a regular hexagon shape as a whole.
5. The time modulation-based microstrip coupling line magnetic loop-free device according to claim 1, wherein the annular direction of the magnetic loop-free device is changed by changing the phase relation of the input alternating current modulation signal, specifically: when the initial phases of the alternating current modulation signals input by the three modulation signal input ports are in anticlockwise increment, and the increment amplitude of two adjacent ports is 120 degrees, the annular direction of the non-magnetic annular device is anticlockwise; when the initial phase of the alternating current modulation signal input by the three modulation signal input ports is increased clockwise and the increasing amplitude of the two adjacent ports is 120 degrees, the annular direction of the non-magnetic annular device is clockwise.
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