198 results about "Microstrip transmission line" patented technology

A packaged RF transistor amplifier includes an RF transistor amplifier die having a first terminal, a first lead, an integrated passive device that includes a first series microstrip transmission line, a first bond wire coupled between the first terminal and the first series microstrip transmission line, and a second bond wire coupled between the first series microstrip transmission line and the first lead.

A tight coupling array antenna based on an integrated microstrip balun is composed of a plurality of polarization units, each polarization unit comprises an antenna floor, a magnetic wave-absorbing material is arranged above the antenna floor, a supporting material is arranged above the magnetic wave-absorbing material, a radio frequency connector is arranged in the antenna floor, the radio frequency connector is connected with one end of a coaxial feeder line, and the other end of the coaxial feeder line is connected with the antenna floor. The other end of the coaxial feeder line sequentially passes through the antenna floor, the magnetic wave-absorbing material and the supporting material; a lower substrate is arranged above the supporting material; a feed balun is printed on the upper surface of the upper-layer substrate, and a multiplexing oscillator arm is printed on the lower surface of the upper-layer substrate; the multi-layer board technology is adopted, the antenna radiator, the coupling body and the feed balun are printed on different copper layers of the multi-layer board respectively, space optimization is achieved, antenna impedance matching is further optimized, and the antenna has the advantages of being excellent in performance and easy to install; according to the invention, the feed balun in the form of the multi-order microstrip transmission line is adopted to optimize all-order microstrip transmission line models, so that the compactness of the antenna unit is effectively improved.

The invention belongs to the technical field of communication, and particularly relates to an ultra-wideband miniaturized Vivaldi antenna. The antenna comprises a dielectric substrate, wherein the upper surface of the dielectric substrate comprises a main body Vivaldi antenna, four resistors, two rectangular metal patches and an artificial surface plasma, wherein the main body Vivaldi antenna is provided with an exponential gradually-changed slot; a feed network is arranged on the lower surface and comprises six impedance conversion microstrip transmission lines, a fan-shaped transmission line and a circular groove; the main body antenna and the dielectric substrate are placed in a centered alignment manner, the four resistors are placed at the tail end of the main body antenna, and the rear sides of the resistors are connected with the two rectangular patches; the artificial surface plasma is placed in the main body antenna gradual change gap; and the multi-section impedance transformer and the microstrip-to-slot line structure of the feed network are aligned with the circular slot of the main body antenna. According to the invention, the ultra wide band, miniaturization and high radiation gain are realized by designing the main body antenna, slotting the edge, loading the resistor, carrying out the artificial surface plasma and the like. The working frequency band of the antenna ranges from 0.2 GHz to 18 GHz, and the antenna has the characteristic of miniaturization.

The invention discloses a single-pole double-throw switch with high power capacity, and relates to the technical field of microwave and millimeter waves, a first switch branch and a second switch branch which are symmetrically arranged respectively comprise a series branch and five parallel branches which are connected in series, and every two adjacent parallel branches are connected in series through a microstrip transmission line. The input end of the series branch is connected with a radio frequency input end, the five parallel branches comprise two switch parallel branches and three cascaded switch series-parallel branches connected in series between the two switch parallel branches, the input end of one switch parallel branch is connected with the output end of the series branch, and the output end of the other switch parallel branch is connected with the input end of the radio frequency input end. And the output of the other switch parallel branch is connected with the radio frequency output end. Each stage of series-parallel branch comprises two field effect transistor series units which are symmetrically arranged and connected at the same point, and equivalently four field effect transistors are connected in series on each stage of series-parallel branch, so that the anti-burnout capability of the switch can be improved, and the isolation degree is improved while the anti-burnout capability of the switch is improved.

The invention relates to the technical field of millimeter wave conversion, and discloses a millimeter wave microstrip conversion structure of a double-ridge waveguide, and the structure comprises a double-ridge waveguide port which is used for transmitting a millimeter wave signal from a waveguide structure to a lambda / 4 single-section impedance transformer; the microstrip transmission line is used for receiving and transmitting the millimeter wave signal; the lambda / 4 single-section impedance transformer is used for transition from the impedance of the double-ridge waveguide port to the impedance of the microstrip transmission line; and the capacitance compensation structure is arranged between the lambda / 4 single-section impedance transformer and the microstrip transmission line so as to compensate step capacitance caused by electric field distribution difference of different transmission lines. By means of the lambda / 4 single-section impedance transformer, balance transition of impedance in space can be achieved by means of the phase characteristic of electromagnetic waves in a quarter-wavelength structure, the return effect of reflected waves is effectively weakened, it is ensured that impedance matching of signals in high-frequency transmission is more accurate by optimizing the impedance value and the length parameter, and the signal transmission efficiency is improved. The loss of transmission energy is reduced, and the signal stability is improved.

The invention discloses an artificial surface plasmon microstrip transmission line with a crosstalk suppression effect. The transmission line conduction band is provided with a periodic internal notch groove structure which is used for transmitting microwave artificial surface plasmons with strong local field constraint performance. The periodic notch grooves can be S-shaped, spiral, T-shaped, cross-shaped, KoCh-shaped, Moore Curve-shaped and other forms and are distributed in the microstrip conduction band, and the width of the conduction band is not increased, so that the remarkable inhibition effect that the far-end crosstalk is lower than-30dB is realized on the premise that the size of the microstrip line is not changed. The microstrip transmission line has the low-pass characteristic, the frequency response falling edge is steep, the cut-off frequency can be flexibly adjusted by adjusting the notch groove width and the number of iterations, and application requirements of different frequency bands can be met by scaling. The structure is simple, the size is compact, inter-line crosstalk can be effectively suppressed, the signal transmission quality is improved, the strict signal integrity requirement is met, and the high-frequency and high-speed signal transmission and functional devices are widely applied, and the wide application prospect is achieved.

The invention discloses a radio frequency coaxial switch, and relates to the technical field of radio frequency connectors, and the switch comprises a switch body, the bottom of the switch body is fixedly connected with an installation butt joint structure, the installation butt joint structure is used for guaranteeing that an internal microstrip transmission line carries out signal transmission on a circuit board through a shielding cover, and a dynamic contact point regulation and control assembly is matched with a dynamic regulation and control assembly. Contact pressure can be automatically adjusted, it is ensured that communication signals are accurate, the contact pressure can be integrally and effectively adjusted automatically according to high-frequency signals or low-frequency signals, error codes of the communication signals caused by poor contact are reduced, the overall operation performance is improved, magnetic particles are gathered in the flexible superconducting contact points in the specific direction, and the contact quality is improved. The contact pressure is increased or reduced, so that the overall signal transmission performance can be improved, the signal loss and reflection can be reduced, and the reliability and efficiency of the radio frequency coaxial switch in different frequency signal processing can be improved.

The invention provides a low-profile circularly polarized antenna unit for slot coupling feed and an array thereof, and the antenna unit employs a plurality of metal layers which are coaxially arranged, are sequentially stacked up and down and are separated through dielectric layers, thereby achieving the high integration of a feed network, a coupling structure and a radiation unit in the vertical direction of the antenna unit. Specifically, the parasitic patch and the radiation patch which are stacked and coupled up and down are adopted, so that the working bandwidth of the antenna unit is expanded; furthermore, the interference of a feed network on the radiation performance of the antenna is reduced through the separation of the upper metal ground and the lower metal ground, and meanwhile, two orthogonally distributed gap structures formed in the upper metal ground are matched with the microstrip transmission line to perform coupling feed, so that the circular polarization performance of the antenna unit is improved; in addition, periodically arranged metallized shielding through holes are formed in the edges of the antenna units, so that surface wave propagation and electromagnetic coupling between the units are effectively inhibited, and the performance stability of the antenna unit during large-angle scanning is improved while the low-profile characteristic of the antenna unit is ensured.

The invention discloses a complementary split ring type antenna sensor for noninvasive blood glucose multi-frequency detection. The complementary split ring type antenna sensor comprises a metal radiation layer, a dielectric layer and a microstrip transmission line, the invention provides a detection method based on a microwave detection (MDT) principle, and the detection method comprises the following steps of: firstly, carrying out a microwave detection (MDT) on the basis of the microwave detection (MDT) principle; the device has the advantages of noninvasive property, high penetrating power, real-time continuous monitoring and the like. According to the present invention, by using a complementary split ring (CSRR) structure, the size design of the antenna sensor is significantly reduced, and a plurality of different resonance modes are successfully excited. A multi-frequency detection mode is adopted, and the robustness and sensitivity of blood glucose concentration detection are improved. The antenna sensor is compact in structure, simple in manufacturing process and low in cost, and has high application value in the field of medical detection. The antenna sensor provided by the invention can monitor the blood glucose concentration in real time, and has the capability of resisting environmental interference (pressure deformation).

Embodiments disclosed herein include a module, comprising: a substrate, wherein the substrate comprises a dielectric material, and a microstrip resonator on the substrate. In an embodiment, a microstrip transmission line is on the substrate adjacent to the microstrip resonator, and the microstrip resonator is spaced from the microstrip transmission line by a gap. In an embodiment, a ground plane on a surface of the substrate is opposite from the microstrip resonator.

The invention belongs to the crossing field of a microwave technology and a sensing technology, and particularly relates to a microwave dielectric parameter measurement sensor based on a micro-flow pipeline embedded in a substrate, and one surface of the substrate is provided with a microstrip transmission line and a resonant structure; the microstrip transmission line is used for exciting and transmitting microwave signals; the resonant structure is used for enhancing electromagnetic field distribution in a certain area of the substrate; a micro-flow pipeline is embedded in the substrate and is used for accurately conveying a substance to be detected to an area where electromagnetic energy is most concentrated; a grounding layer is arranged on one side of the substrate and used for restraining an electromagnetic field, and energy of the electromagnetic field is mainly concentrated in the substrate. The micro-flow pipeline is embedded in a strong electric field area in the substrate, so that a to-be-measured substance directly interacts with an electromagnetic energy concentration area, and dielectric parameter measurement which is compact in structure, high in sensitivity and high in precision is achieved. The sensor provided by the invention has wide application prospects in the fields of biomedical detection, chemical analysis, environmental monitoring, industrial process control and the like.

The embodiment of the invention provides a microstrip-to-waveguide device and a radar level meter. When the microstrip-to-waveguide device is designed, two antenna units can be arranged in the waveguide cavity of the waveguide structure, and two microstrip transmission lines used for feeding the two antenna units can extend into the waveguide cavity through different microstrip ports arranged on the waveguide cavity and feed the antenna units connected with the microstrip transmission lines respectively. Therefore, the two microstrip transmission lines can be isolated, and the isolation degree of signals transmitted by the two antenna units is improved. Furthermore, a resonance probe can be arranged in the waveguide cavity, and the isolation degree of signals transmitted by the two antenna units is improved through the resonance characteristic of the resonance probe. Through the structural design, components such as a power divider or a hybrid ring do not need to be introduced into a circuit, so that the whole microstrip-to-waveguide device is simpler in structure, good in isolation degree and suitable for equipment such as a radar level meter which requires a radio frequency module to be small in size.

The present invention relates to the field of wireless communication technologies, and provides a microstrip dual-path coupled resonator filter. The microstrip dual-path coupled resonator filter includes a metal layer, a silicon substrate stacked on the metal layer, and a filter structure stacked on the silicon substrate; the filter structure passes through the silicon substrate and is electrically connected to the metal layer; the filter structure includes two microstrip transmission lines stacked and fixed on the silicon substrate and oppositely arranged along a first direction, two open-circuit microstrip resonators, a short-circuit resonator, and a tightly coupled feeding structure; the two microstrip transmission lines and the two open-circuit microstrip resonators are arranged in an interleaved manner, and the open-circuit microstrip resonators and the short-circuit resonator are spaced from the two microstrip transmission lines respectively; each microstrip transmission line is configured with two tightly coupled feeding structures, and the other ends of the two tightly coupled feeding structures are respectively connected to the two open-circuit microstrip resonators. The microstrip dual-path coupled resonator filter of the present invention has high integration and reliability.

The invention relates to an electromagnetic sensor based on a split-ring resonator array and a crack detection method, the sensor comprises a first flexible dielectric substrate, a bonding layer, a second flexible dielectric substrate and a metal grounding layer which are bonded from top to bottom, and the top surface of the first flexible dielectric substrate is provided with a microstrip transmission line; one end of the first flexible dielectric substrate is provided with an SMA interface hole, and the bottom surface of the first flexible dielectric substrate is provided with a split-ring resonator array which is in electromagnetic coupling with the microstrip transmission line. The invention also provides a crack detection method of the sensor. The electromagnetic sensor is adjustable in detection area and uniform in field distribution.

The present invention discloses a non-magnetic simultaneous transmit and receive (STAR) duplexer for terahertz communication and sensing integration, which includes a dielectric substrate, a microstrip stepped impedance filter, varactor diodes, terahertz signal input / output ports, modulation signal input ports, ground ports, and a Y-shaped microstrip transmission line connection. Through the design of distributed parameter circuits, the present invention overcomes the problem of mismatch of the non-magnetic STAR duplexer with lumped parameter circuits at high frequencies. The main structure of the present invention is composed of a microstrip circuit. The ports connecting the external modulation signal and the ground port include lumped element filters. The overall structure is simple and easy to process and integrate.

The invention discloses a high-selectivity broadband cavity band-pass filter for low-orbit satellite communication and a manufacturing method, particularly relates to the technical field of communication, and solves the problems that in the prior art, due to the fact that periodic metal strips are loaded on a micro-strip transmission line and a substrate integrated waveguide, the structural loss is large; a periodic unit is loaded in a metal waveguide to form the characteristics that the lower stop band of the artificial surface plasmon is poor in selectivity and the metal waveguide is not flexible enough; and existing metal waveguide artificial surface plasmon polaritons cannot effectively achieve the purpose that the upper stop band is wide enough. According to the technical scheme, on the basis of an artificial surface plasmon polariton band-pass filter with an inverted-T-shaped groove etched in a center ridge, a pair of symmetrical folding groove structures is etched to form a 1 / 4 wavelength resonator, the 1 / 4 wavelength resonator is used for generating a zero point in a lower stop band, the selectivity of the band-pass filter is improved, and meanwhile the wide stop band characteristic is achieved by controlling the length of a grating; according to the invention, the loss is lower, and a wider stop band is realized.

The invention provides a low-loss microstrip transmission line based on substrate stacking and bonding. The low-loss microstrip transmission line comprises an upper carrier plate layer, a hollow transmission layer, a lower carrier plate layer, a first bonding layer and a second bonding layer, a first metal layer is arranged on the lower surface of the upper carrier plate layer, and a second metal layer is arranged on the upper surface of the lower carrier plate layer; the first metal layer, the second metal layer and the hollow-out area of the hollow-out transmission layer jointly form a transmission area; electromagnetic waves are propagated in the transmission area in a quasi-TEM mode form; the upper carrier plate layer, the first bonding layer, the hollow transmission layer, the second bonding layer, the second metal layer and the lower carrier plate layer are stacked and bonded in parallel in sequence; and therefore, the interlayer is tightly bonded, the structure is flat and stable, and displacement and height change between the layers are avoided. The invention has the advantages of low cost and low loss, and is suitable for the field of microwave communication transmission. In addition, the antenna also has the characteristics of easy processing, high integration and wide frequency band, so that the antenna is widely applied to scenes using a multilayer board integration technology.

The invention discloses a miniaturized tunable three-dimensional antenna which comprises a distributed large capacitor structure, a magnetic ferrite material loading coil structure and a tunable feed circuit board. The distributed large-capacitance structure comprises multiple layers of metal plates which are embedded and arranged in a laminated manner along the vertical direction; in the magnetic ferrite material loading coil structure, one end of a coil is connected with a top metal plate of the distributed large capacitor structure. The tunable feed circuit board comprises a plurality of microstrip transmission lines, and each microstrip transmission line is provided with a disconnection part used for arranging an adjustable capacitor / inductor or a switching device. The distributed large-capacitance structure is connected with one microstrip transmission line through one metal column; in the magnetic ferrite material loading coil structure, the other end of the coil is connected with the other microstrip transmission line. The antenna provided by the invention can give consideration to a larger bandwidth through the tuning circuit, allows the antenna to adjust the working frequency within a certain frequency range, and has a very strong anti-interference capability.

The application provides a YIG film-based adaptive on-chip filter and a design method thereof.The filter comprises a YIG film-loaded four-port transducing structure, a terminal matching network and a front-end matching network, the YIG film-loaded four-port transducing structure is composed of two parallel microstrip transmission lines and a YIG film covering the two parallel microstrip transmission lines, the two ends of the parallel microstrip transmission lines are the ports of the YIG film-loaded four-port transducing structure, the YIG film is used for converting electromagnetic waves into static magnetic surface waves, the terminal matching network is connected with two diagonal ports of the YIG film-loaded four-port transducing structure respectively, and the front-end matching network is connected with the other two diagonal ports of the YIG film-loaded four-port transducing structure, namely an input port and an output port.Through the terminal matching design and the front-end impedance matching network design, the application significantly reduces the insertion loss of the device under a low-power signal.

The invention provides a multi-scale round-square nested fractal antenna applied to wings of an unmanned aerial vehicle. The multi-scale round-square nested fractal antenna comprises a substrate, the grounding layer is arranged on the lower surface of the substrate; the feed structure is arranged at one end of the upper surface of the substrate and comprises an input feed line, a micro-strip transmission line and a chip resistor connected with the input end of the feed line and the micro-strip transmission line; the radiation structure is arranged at one end, far away from the feed structure, of the upper surface of the substrate and comprises a radiation patch; the transmission structure is arranged on the upper surface of the substrate, is used for connecting the feed structure and the radiation structure, and comprises an impedance transition transmission line; the microstrip transmission line is of a geometric gradual change type, the radiation patch is of a multi-scale fractal topology formed by nesting circular contours and square contours, the circular contours and the square contours are sequentially arranged in a nesting mode according to preset intervals and form multi-stage self-similar boundaries, the impedance transition transmission line is in a periodical bending shape, and the line widths of all the parts are consistent. The fractal antenna solves the problem that in the prior art, a fractal antenna which is compact in structure, high in radiation efficiency and suitable for wing embedded installation does not exist.

The invention discloses a miniaturized multi-channel power divider applied to a low frequency band, which comprises a total port matching transmission line, at least two groups of sub-port matching transmission lines and corresponding sub-port isolation networks, and is characterized in that the total port matching transmission line is connected with each sub-port matching transmission line through a microstrip transmission line and a T-shaped transmission line; the tail ends of the branch port matching transmission lines are connected with the branch port isolation networks, the tail ends of all the branch port isolation networks are communicated with one another, and the working frequency range is 32.5 MHz to 37.5 MHz. The lumped elements and the microstrip lines are matched to optimize the impedance characteristic, the size is only 1 / 10 of that of a conventional power divider, and the problem that the size of a low-frequency-band power divider is too large is solved; and meanwhile, the multi-path power divider has low insertion loss, high port isolation and good phase consistency, can realize multi-path power distribution by adjusting the number of branches, is adaptive to the compact radio frequency module requirements of portable and embedded equipment, and is suitable for scenes such as private network communication, Internet of Things, aviation communication and the like.

The invention discloses an adjustable low-pass filter circuit which comprises two first defected ground structures, two second defected ground structures, two first additional defected ground structures and two second additional defected ground structures which are symmetrically distributed relative to an X axis and are sequentially etched along the Y axis at the position, under a micro-strip transmission line, on a ground plane, and the two first defected ground structures, the two second defected ground structures, the two first additional defected ground structures and the two second additional defected ground structures are symmetrically distributed relative to the X axis. The first defected ground structure is connected with the first direct current bias circuit, and the second defected ground structure is connected with the second direct current bias circuit; variable capacitance diodes are inserted into the first defected ground structure and the second defected ground structure, the sizes of introduced equivalent capacitance and equivalent inductance are changed by changing the sizes of the defected ground structures and the additional defected ground structures, the transmission characteristics of the microstrip transmission line are changed, and the transmission characteristics of the microstrip transmission line are changed by changing the bias voltage of the direct-current bias circuit. The equivalent capacitance of the variable capacitance diode is changed, and the cut-off frequency of the low-pass filter circuit is tuned; the filter has the advantages that high selectivity of the filter is guaranteed, and meanwhile high stopband suppression is taken into consideration.

The invention discloses a terahertz directional diagram reconfigurable antenna based on an RF-MEMS switch, and belongs to the technical field of terahertz radio frequency front-end devices. The antenna is composed of a radiation unit, a composite beam ohmic contact type MEMS switch, a coplanar waveguide feed structure, a microstrip transmission line, a dielectric substrate and a metal ground backboard. The antenna adopts a single-layer quartz glass substrate integrated waveguide (SIW) feed structure, excellent impedance matching with a microstrip transmission line is realized, the relative bandwidth exceeds 19%, and an MEMS switch is driven to act through direct current bias. The antenna has a relatively wide impedance bandwidth. Reconfiguration of a directional diagram is controlled through on-off of a switch, the antenna achieves-40-degree, 0-degree and + 40-degree three-beam directional switching in the 00 mode, the 01 mode and the 10 mode, the main lobe widths in the three modes are 55.61 degrees, 58.94 degrees and 98.56 degrees respectively, and wide-angle-domain coverage is supported.

The invention discloses an antenna feed device and method. The device comprises a coaxial transmitter, a microstrip transmission line, a dielectric substrate and a connecting structure. And a probe of the coaxial transmitter is in contact with the microstrip transmission line. The microstrip transmission line is etched on the dielectric substrate. A gap exists between the end face of the outer conductor of the coaxial transmitter and the dielectric substrate in the axial direction of the probe. And the connecting structure is connected with the dielectric substrate and the coaxial transmitter and is used for providing impedance matching for transmission of the probe and the microstrip transmission line. According to the invention, the problem of stray capacitance caused by difficulty in guaranteeing the processing and assembling consistency of microstrip transmission line signal transmission in a large-scale antenna array through coaxial probe feeding is solved, and the feasibility and practicability in practical application are improved.

This invention discloses a broadband frequency-shifting conformal transmission method for electromagnetic waves based on a time-varying circuit with dual constitutive parameters, belonging to the fields of microwave radio frequency, time metamaterials, and frequency domain transformation technology. The method is implemented using a frequency-shifting transmission circuit, which includes a microstrip transmission line and a periodically loaded inductor branch. The inductor branch includes switches, series inductors, and parallel inductors. When all switches in the frequency-shifting transmission circuit are open, an input pulse signal is sent to the circuit. When the pulse signal has fully entered the microstrip transmission line, all switches close simultaneously. Due to the wavenumber conservation of the microstrip transmission line, frequency shift occurs, achieving frequency-shifting transmission. This method does not rely on a complex local oscillator system, does not increase circuit complexity excessively, and theoretically does not generate harmonics. It achieves broadband frequency shifting, reflection-free, high-efficiency transmission, and waveform distortion-free conformal transmission, providing a new technical path for broadband, low-distortion signal processing in the microwave radio frequency field.

The present application relates to a metal crack detection device and method based on an open resonator slow-wave structure. The device includes a dielectric substrate, a microstrip transmission line, and a resonant unit group. The resonant unit group includes a plurality of resonant units periodically interwoven and distributed on both sides of the central axis of the dielectric substrate. The resonant unit group is used to excite its own resonance in a coupling manner through the plurality of resonant units and generate a uniform magnetic field of a slow-wave structure to generate a passband. The metal crack detection device uses a plurality of resonant units periodically interwoven and distributed on both sides of the central axis of the dielectric substrate to achieve the ability to adjust the coverage area of the metal crack detection device to meet demand and to detect metal cracks in a larger range. During the electromagnetic wave transmission process, the individual resonant units in the resonant unit group are excited by magnetic field coupling to generate a slow-wave structure and a relatively uniform magnetic field. This makes the metal crack detection device insensitive to the location of the metal crack in metal crack detection applications and has a high sensitivity.

The invention discloses a microstrip transmission line, and relates to the technical field of microstrip transmission, the microstrip transmission line comprises a plurality of segments, except the segment at the central position, other segments are connected with capacitors in parallel, the segment at the central position is the (n + 1) / 2 segment, n is an odd number greater than or equal to 3, and n is the number of the segments. The microstrip transmission line provided by the invention has the advantages of small impedance and large transmission power.

The present invention discloses a method and system for constructing a multifunctional adaptive directional backtracking Doppler stealth cloak. Specifically, the method comprises: constructing a 2-bit phase shifter based on a reconfigurable microstrip transmission line, adjusting the length of the microstrip transmission line so that the phase shifter achieves four discrete phase states; analyzing the generalized conjugate relationship between the receiving phase and the radiating phase of the array elements in the antenna array, constructing a reconfigurable Van Atta array model based on the 2-bit phase shifter, and achieving adaptive directional backtracking in the four discrete phase states; introducing time modulation into the reconfigurable Van Atta array model to achieve Doppler frequency compensation for the adaptive directional backtracking, thereby obtaining a Doppler cloak; and introducing spatial modulation into the reconfigurable Van Atta array model to achieve radar cross-section (RCS) reduction during the adaptive directional backtracking, thereby obtaining a multifunctional Doppler stealth cloak. This method can significantly improve the efficiency of the multifunctional adaptive directional control of the Doppler stealth cloak.

The invention relates to the technical field of anti-interference receiving, and discloses a tunable high-temperature superconducting amplitude limiter based on voltage regulation. Comprising a radio-frequency signal input end P1, a first impedance conversion node assembly, a superconducting amplitude limiting node L4, a direct-current bias regulation and control circuit for introducing bias current to the superconducting amplitude limiting node L4, a second impedance conversion node assembly and a radio-frequency signal output end P2 which are electrically connected in sequence, the first impedance conversion node assembly and the second impedance conversion node assembly are the same in structure, and each of the first impedance conversion node assembly and the second impedance conversion node assembly comprises a superconducting microstrip transmission line, a blocking capacitor and an impedance conversion node, on the premise that geometric structure parameters of the high-temperature superconducting amplitude limiting section are not changed, the working current density of the high-temperature superconducting amplitude limiting section can be changed within the range close to or away from the critical current density of the superconducting material by adjusting the magnitude of the bias current, and therefore tuning of the amplitude limiting threshold value and the power bearing capacity of the amplitude limiter is achieved.