CN211700521U - L-band frequency reconfigurable non-reciprocal filter - Google Patents
L-band frequency reconfigurable non-reciprocal filter Download PDFInfo
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- CN211700521U CN211700521U CN202020019463.3U CN202020019463U CN211700521U CN 211700521 U CN211700521 U CN 211700521U CN 202020019463 U CN202020019463 U CN 202020019463U CN 211700521 U CN211700521 U CN 211700521U
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Abstract
The utility model discloses a reconfigurable nonreciprocal filter of L wave band frequency, including dielectric substrate, microstrip syntonizer, radio frequency input and output, modulation signal input end, inductance and varactor, microstrip syntonizer is equipped with three groups, and is first syntonizer, second syntonizer and third syntonizer respectively, radio frequency input and output are equipped with two sets ofly, and are first radio frequency port and second radio frequency port respectively, modulation signal input end is equipped with three groups, and is first modulation port, second modulation port and third modulation port respectively; the utility model discloses need not any magnetic material biasing, only realize the nonreciprocal nature of electromagnetic wave transmission through the technical route of the low frequency modulation signal of loading band direct current biasing and control modulation signal's frequency, amplitude and phase place to realize no magnetism biasing nonreciprocal filter, have with low costs, miniaturized, can with advantages such as circuit integration.
Description
Technical Field
The utility model relates to a wave filter technical field especially relates to a reconfigurable nonreciprocal filter of L wave band frequency.
Background
The L wave band is a radio wave band with the frequency of 1 to 2GHz, the filter with reconfigurable frequency can meet more engineering application requirements and has the advantage of reducing the complexity of a system, the nonreciprocal property is that electromagnetic waves are transmitted in a certain dielectric material along two opposite directions and have different characteristics of electromagnetic loss, phase shift and the like, for example, an isolator can protect a signal source from being damaged by high-power reflected signals, a circulator can enable the electromagnetic waves to be directionally transmitted, the conventional nonreciprocal radio frequency device usually adopts a magnetic material and an external magnetic field bias mode to break time reversal symmetry, and the nonreciprocal devices have the defects of high loss, large volume, high manufacturing cost, incapability of being integrated with a circuit and the like due to the use of the magnetic material,
in recent years, some foreign scholars successfully adopt a space-time modulation method to break time reversal symmetry, so that a non-magnetic bias non-reciprocity radio frequency device, such as a non-reciprocity antenna, is realized, the interference of a strong ground reflection signal is not received while high-efficiency stable unidirectional transmission of a useful electromagnetic signal is realized, the improvement of electromagnetic compatibility in a system is facilitated, and the general implementation method of the space-time modulation is as follows: the time-varying modulation signal is loaded discretely on a medium or a device, the frequency, the amplitude and the initial phase of the modulation signal are controlled to realize the nonreciprocal propagation of the electromagnetic wave,
along with the rapid development of communication technology, to the miniaturization and the integration requirement of device more and more high, magnetic material such as ferrite almost all need be adopted to present non-reciprocity device, and incompatible with CMOS integrated circuit processing technology on the magnetic material lattice causes these microwave devices to be difficult to with system circuit integration together, consequently, the utility model provides a reconfigurable non-reciprocity filter of L wave band frequency is in order to solve the problem that exists among the prior art.
SUMMERY OF THE UTILITY MODEL
To solve the above problem, an object of the present invention is to provide an L-band frequency reconfigurable non-reciprocal filter that does not require any magnetic material bias to realize the non-reciprocity of electromagnetic wave transmission, and that realizes the reconfigurable characteristic of frequency by controlling the bias voltage of a varactor diode, and the operating frequency band is the L band.
For realizing the purpose of the utility model, the utility model discloses a following technical scheme realizes: a L-band frequency reconfigurable non-reciprocal filter comprises a dielectric substrate, microstrip resonators, radio frequency input and output ends, a modulation signal input end, an inductor and a varactor diode, wherein the microstrip resonators are provided with three groups which are respectively a first resonator, a second resonator and a third resonator, the radio frequency input and output ends are provided with two groups which are respectively a first radio frequency port and a second radio frequency port, the modulation signal input end is provided with three groups which are respectively a first modulation port, a second modulation port and a third modulation port, and the inductor and the varactor diode are provided with three groups;
the top of the dielectric substrate is provided with a first resonator, a second resonator, a third resonator, a first radio frequency port and a second radio frequency port, and the bottom of the dielectric substrate is composed of a first modulation port, a second modulation port, a third modulation port, three groups of inductors and three groups of variable capacitance diodes;
the first resonator, the second resonator and the third resonator are sequentially arranged in a staggered mode, the coupling strength of the first resonator, the second resonator and the third resonator is controlled by controlling the distance between the first resonator, the second resonator and the third resonator, and one ends of the first resonator, the second resonator and the third resonator are respectively connected with the three groups of the variable capacitance diodes on the back face through metal through holes.
The further improvement lies in that: the first radio frequency port and the second radio frequency port are input and output ports of radio frequency signals, if the first radio frequency port is a signal input port, the second radio frequency port is a signal output port, if the first radio frequency port is a signal output port, the second radio frequency port is a signal input port, the first radio frequency port and the second radio frequency port are of microstrip structures, the characteristic impedance is ohm, and the input and the output of the signals are realized in a coupling mode.
The further improvement lies in that: the first modulation port, the second modulation port and the third modulation port are all arranged on a copper-clad plate on the back of the dielectric substrate, a coplanar waveguide structure is adopted to transmit low-frequency modulation signals and direct-current bias signals, and the characteristic impedance of the coplanar waveguide is designed to be ohm.
The further improvement lies in that: the tail ends of the modulation signal input channels of the first modulation port, the second modulation port and the third modulation port are connected with the metal through hole through the inductor, and the radio frequency input end and the radio frequency output end are isolated from the modulation signal input end.
The further improvement lies in that: one ends of the three groups of variable capacitance diodes are respectively connected with the first resonator, the second resonator and the third resonator through metal through holes, the other ends of the three groups of variable capacitance diodes are connected with a metal ground, and the variable capacitance diodes work in a reverse bias state and play a role of capacitance.
The utility model has the advantages that: the utility model discloses need not any magnetic material biasing, only realize the nonreciprocal nature of electromagnetic wave transmission through the technical route of the low frequency modulation signal of loading band direct current biasing and control modulation signal's frequency, range and phase place to realize no magnetism biasing nonreciprocal nature wave filter, have with low costs, miniaturized, can with advantages such as circuit integration, and control varactor's direct current bias voltage, can realize wave filter operating frequency's reconfigurable characteristic.
Drawings
Fig. 1 is a top view of the structure of the present invention;
fig. 2 is a bottom view of the structure of the present invention;
fig. 3 is a schematic diagram of a scattering parameter test curve of the filter when the dc bias voltage is 2.7V according to the present invention;
fig. 4 is a schematic diagram of a scattering parameter test curve of the filter when the dc bias voltage is 1.4V;
fig. 5 is a schematic diagram of a scattering parameter test curve of the filter when the dc bias voltage is 4.0V.
Wherein: 1. a dielectric substrate; 2. an inductance; 3. a varactor diode; 4. a first resonator; 5. a second resonator; 6. a third resonator; 7. a first radio frequency port; 8. a second radio frequency port; 9. a first modulation port; 10. a second modulation port; 11. a third modulation port; 12. and (6) a metal through hole.
Detailed Description
In order to deepen the understanding of the present invention, the following embodiments will be combined to make the present invention do further details, and the present embodiment is only used for explaining the present invention, and does not constitute the limitation of the protection scope of the present invention.
According to fig. 1, 2, 3, 4, and 5, the present embodiment provides a non-reciprocal filter with reconfigurable L-band frequency, including a dielectric substrate 1, a microstrip resonator, a radio frequency input and output end, a modulation signal input end, an inductor 2, and a varactor diode 3, where the microstrip resonator has three groups, which are respectively a first resonator 4, a second resonator 5, and a third resonator 6, the radio frequency input and output end has two groups, which are respectively a first radio frequency port 7 and a second radio frequency port 8, the modulation signal input end has three groups, which are respectively a first modulation port 9, a second modulation port 10, and a third modulation port 11, and the inductor 2 and the varactor diode 3 have three groups;
the top of the dielectric substrate 1 is provided with a first resonator 4, a second resonator 5, a third resonator 6, a first radio frequency port 7 and a second radio frequency port 8, and the bottom of the dielectric substrate 1 is composed of a first modulation port 9, a second modulation port 10, a third modulation port 11, three groups of inductors 2 and three groups of varactor diodes 3;
the first resonator 4, the second resonator 5 and the third resonator 6 are placed in a staggered mode in sequence, the coupling strength of the first resonator 4, the second resonator 5 and the third resonator 6 is controlled by controlling the distance between the first resonator 4, the second resonator 5 and the third resonator 6, and one end of each of the first resonator 4, the second resonator 5 and the third resonator 6 is connected with the three groups of the varactor diodes 3 on the back side through a metal through hole 12.
The first radio frequency port 7 and the second radio frequency port 8 are input and output ports of radio frequency signals, if the first radio frequency port 7 is a signal input port, the second radio frequency port 8 is a signal output port, if the first radio frequency port 7 is a signal output port, the second radio frequency port 8 is a signal input port, the first radio frequency port 7 and the second radio frequency port 8 are microstrip structures, the characteristic impedance is 50 ohms, and the input and the output of the signals are realized in a coupling mode.
The first modulation port 9, the second modulation port 10 and the third modulation port 11 are all placed on a copper-clad plate on the back of the dielectric substrate 1, a coplanar waveguide structure is adopted to transmit low-frequency modulation signals and direct-current bias signals, and the characteristic impedance of the coplanar waveguide is designed to be 50 ohms.
The tail ends of the modulation signal input channels of the first modulation port 9, the second modulation port 10 and the third modulation port 11 are connected with the metal through hole 12 through the inductor 2, and the radio frequency input end and the radio frequency output end are isolated from the modulation signal input end.
One ends of the three groups of the variable capacitance diodes 3 are respectively connected with the first resonator 4, the second resonator 5 and the third resonator 6 through metal through holes 12, the other ends of the three groups of the variable capacitance diodes 3 are connected with a metal ground, and the variable capacitance diodes 3 work in a reverse bias state and play a role of capacitance.
The space-time modulation implementation method comprises the following steps: the first modulation port 9, the second modulation port 10 and the third modulation port 11 are sequentially fed with time-varying low-frequency modulation signals with frequency and phase of direct current bias, and at the moment, the capacitance value of each varactor 3 changes with time near a static point in a formula, wherein the static capacitance value is determined by direct current bias voltage, is a modulation coefficient (0< <1), is a capacitance fluctuation amplitude value and is controlled by the amplitude of the modulation signals.
When the phases of the three paths of modulation signals are controlled to meet the requirements in sequence after the proper modulation signal frequency and amplitude are selected, wherein the phases are stepping phases, radio-frequency signals can be transmitted from the first radio-frequency port 7 to the second radio-frequency port 8, and the radio-frequency signals cannot be effectively transmitted from the second radio-frequency port 8 to the first radio-frequency port 7; on the contrary, when the phases of the three modulation signals are sequentially satisfied, the radio frequency signal can be transmitted from the second radio frequency port 8 to the first radio frequency port 7, but the radio frequency signal cannot be effectively transmitted from the first radio frequency port 7 to the second radio frequency port 8, so that the nonreciprocal transmission of the electromagnetic wave is realized.
The working frequency of the filter can be changed by controlling the magnitudes of the dc bias voltages fed to the first modulation port 9, the second modulation port 10 and the third modulation port 11, so as to achieve frequency reconfiguration, and the smaller the dc bias voltage is, the lower the working frequency of the filter is, and the larger the dc bias voltage is, the higher the working frequency of the filter is.
The utility model discloses the base plate that medium base plate 1 adopted adopts for the wave filter, for Rogers RT/duriod5880, thickness 1.575mm, the size is l1＝100mm，w 130 mm. As shown in fig. 1, the first resonator 4 and the third resonator 6 of the present invention have the same length l252.6mm, the length of the second resonator 5 is l450.9 mm. When the microstrip line filter is optimally designed, attention needs to be paid to adjusting the spacing between the resonators to realize good impedance matching, and s in the preferred embodiment1＝2.53mm，s20.43 mm. The microstrip resonator, the radio frequency input end and the radio frequency output end all adopt a microstrip line structure with characteristic impedance of 50 ohms, namely w22.3 mm. Other dimensions l of the microstrip line structure3＝13.2mm，l5＝63.9，l6＝8.6mm，h1＝1.5mm。
The bottom view of the utility model is shown in fig. 2, varactor 3's model is SMV1232, and inductance 2 is 100nH for the paster inductance value. The characteristic impedance of the coplanar waveguide is 50 ohms, i.e. s3＝0.3mm，w31.4mm, length dimension l of the coplanar waveguide7＝14.8mm，l8＝7.1mm，l911.7 mm. Removing diameter phi from metal floor1Round surface of 2.4mm and diameter phi2A 1.8mm round metal surface is used to fixedly bond the varactor 3 and the inductor 2.
Radio frequency signals are fed from the first radio frequency port 7 or the second radio frequency port 8, and direct current bias voltage and low frequency modulation signals are sequentially fed from a modulation port 9, a second modulation port 10 and a third modulation port 11. The nonreciprocal of electromagnetic wave transmission is realized by controlling the frequency, amplitude and phase relationship of the modulation signal. The working frequency of the filter can be adjusted by controlling the direct-current bias voltage fed into the modulation port, so that frequency reconfiguration is realized.
Fig. 3 is a test curve of scattering parameter of the filter under 2.7V dc bias voltage, and other parameters in the test are as follows: low frequency modulation signal frequency fm40MHz, modulation factor ΔmThe three modulation signal phases satisfy 0.09 in sequence
And step the phase
And (4) degree. From FIG. 3, S can be seen21≠S12Electromagnetic wave propagation has non-reciprocity, electromagnetic waves can be transmitted from the first radio frequency port 7 to the second radio frequency port 8, but electromagnetic waves cannot be transmitted from the second radio frequency port 8 to the first radio frequency port 7. Meanwhile, the filter can be found to be well matched around the central frequency of 1.56GHz, and has good return loss characteristics.
When the dc bias is controlled to be reduced to 1.4V, the experimental test curve of the scattering parameter of the filter is shown in fig. 3, and other parameters in the experimental test are as follows: low frequency modulation signal frequency fm40MHz, modulation factor ΔmThe phase of three modulation signals satisfies 0.07
And step the phase
And (4) degree. From FIG. 2, S can be seen21≠S12Electromagnetic wave propagation has non-reciprocity, electromagnetic waves can be transmitted from the first radio frequency port 7 to the second radio frequency port 8, but electromagnetic waves cannot be transmitted from the second radio frequency port 8 to the first radio frequency port 7. Meanwhile, the filter can be found to be well matched around the central frequency of 1.46GHz, and has good return loss characteristics.
Controlling the DC bias to increase to 4.0VThe experimental test curve of the scattering parameter of the filter is shown in fig. 4, and other parameters in the experimental test are as follows: low frequency modulation signal frequency fm45MHz, modulation factor ΔmThe three modulation signal phases satisfy 0.11 in sequence
And step the phase
And (4) degree. From FIG. 2, S can be seen21≠S12Electromagnetic wave propagation has non-reciprocity, electromagnetic waves can be transmitted from the first radio frequency port 7 to the second radio frequency port 8, but electromagnetic waves cannot be transmitted from the second radio frequency port 8 to the first radio frequency port 7. Meanwhile, the filter can be found to be well matched around the central frequency of 1.63GHz, and has good return loss characteristics.
Furthermore, it can be seen from fig. 3, 4 and 5 that the designed filter has an insertion loss of about 4 to 5dB due to the use of lumped devices such as the varactor 3 and the inductor 2.
The L-band frequency reconfigurable non-reciprocal filter does not need any magnetic material bias, realizes the non-reciprocity of electromagnetic wave transmission only by loading a low-frequency modulation signal with direct current bias and controlling the technical path of the frequency, amplitude and phase of the modulation signal, thereby realizing the non-magnetic bias non-reciprocal filter, having the advantages of low cost, miniaturization, integration with a circuit and the like, controlling the direct current bias voltage of the variable capacitance diode 3 and realizing the reconfigurable characteristic of the working frequency of the filter.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. An L-band frequency reconfigurable non-reciprocal filter, characterized by: the micro-strip resonator comprises a dielectric substrate (1), micro-strip resonators, radio frequency input and output ends, a modulation signal input end, an inductor (2) and a variable capacitance diode (3), wherein the micro-strip resonators are provided with three groups which are respectively a first resonator (4), a second resonator (5) and a third resonator (6), the radio frequency input and output ends are provided with two groups which are respectively a first radio frequency port (7) and a second radio frequency port (8), the modulation signal input ends are provided with three groups which are respectively a first modulation port (9), a second modulation port (10) and a third modulation port (11), and the inductor (2) and the variable capacitance diode (3) are provided with three groups;
the top of the dielectric substrate (1) is provided with a first resonator (4), a second resonator (5), a third resonator (6), a first radio frequency port (7) and a second radio frequency port (8), and the bottom of the dielectric substrate (1) is composed of a first modulation port (9), a second modulation port (10), a third modulation port (11), three groups of inductors (2) and three groups of varactors (3);
the first resonator (4), the second resonator (5) and the third resonator (6) are sequentially arranged in a staggered mode, the coupling strength of the first resonator (4), the second resonator (5) and the third resonator (6) is controlled by controlling the distance between the first resonator (4), the second resonator (5) and the third resonator (6), and one ends of the first resonator (4), the second resonator (5) and the third resonator (6) are respectively connected with the three groups of the varactor diodes (3) on the back side through metal through holes (12).
2. The L-band frequency reconfigurable non-reciprocal filter of claim 1, wherein: the first radio frequency port (7) and the second radio frequency port (8) are input and output ports of radio frequency signals, if the first radio frequency port (7) is a signal input port, the second radio frequency port (8) is a signal output port, if the first radio frequency port (7) is a signal output port, the second radio frequency port (8) is a signal input port, the first radio frequency port (7) and the second radio frequency port (8) are of microstrip structures, the characteristic impedance is 50 ohms, and the input and the output of the signals are realized in a coupling mode.
3. The L-band frequency reconfigurable non-reciprocal filter of claim 1, wherein: the first modulation port (9), the second modulation port (10) and the third modulation port (11) are all placed on a copper-clad plate on the back of the dielectric substrate (1), a coplanar waveguide structure is adopted to transmit low-frequency modulation signals and direct-current bias signals, and the characteristic impedance of the coplanar waveguide is designed to be 50 ohms.
4. The L-band frequency reconfigurable non-reciprocal filter of claim 1, wherein: the tail ends of the modulation signal input channels of the first modulation port (9), the second modulation port (10) and the third modulation port (11) are connected with the metal through hole (12) through the inductor (2), and the radio frequency input end and the radio frequency output end are isolated from the modulation signal input end.
5. The L-band frequency reconfigurable non-reciprocal filter of claim 1, wherein: one ends of the three groups of the variable capacitance diodes (3) are respectively connected with the first resonator (4), the second resonator (5) and the third resonator (6) through metal through holes (12), the other ends of the three groups of the variable capacitance diodes (3) are connected with metal ground, and the variable capacitance diodes (3) work in a reverse bias state and play a role of capacitance.
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| CN112737147A (en) * | 2020-12-10 | 2021-04-30 | 重庆大学 | Large dynamic high-efficiency microwave rectification scheme based on non-magnetic non-reciprocal network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112737147A (en) * | 2020-12-10 | 2021-04-30 | 重庆大学 | Large dynamic high-efficiency microwave rectification scheme based on non-magnetic non-reciprocal network |
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Effective date of registration: 20220919 Address after: No. 188, Industrial Concentration Zone, Yuetang Town, Yizheng City, Yangzhou City, Jiangsu Province, 211414 Patentee after: Yangzhou Markwell Technology Co.,Ltd. Address before: 100081 1129-90, 11 / F, 18 Zhongguancun Street, Haidian District, Beijing Patentee before: Beijing chunteng Xingchuang Education Technology Co.,Ltd. |