12 results about "Nonlinear transmission line" patented technology

A nonlinear transmission line (NLTL) comprises a plurality of interconnected transmission line cells, each including a shunt path and a transmission line length wherein the shunt path includes a varactor diode and an inductor coupled in series with the varactor diode. A shunt path transmission line may be coupled in the shunt path and one or more filters may be coupled to an input and / or an output of the NLTL.

The invention discloses a method for obtaining the thickness and refractive index of a film, a test system, a storage medium and application. The method for obtaining the thickness and the refractive index of the thin film comprises the following steps: obtaining an intermediate frequency signal carrying transmission phase information by using two groups of nonlinear transmission line terahertz frequency comb generators and a broadband mixer, and obtaining an actually measured phase curve based on the intermediate frequency signal; constructing an equivalent multi-optical-path interference model of the thin film, performing coherent superposition on multiple reflection components of a measured wave signal in the thin film in a complex field to obtain a complex phase of a total transmission field, and obtaining a phase-frequency change spectrum based on the complex phase as a model phase curve; and an error function of the model phase curve and the actually measured phase curve is constructed, and a parameter combination enabling the error function to take the minimum value is solved by scanning the parameter combination of the refractive index n and the thickness d of the thin film. According to the method, thermal drift or time drift of the phase is avoided, and then calculation errors caused by phase jump are avoided.

The application discloses a terahertz frequency doubler structure and method based on a nonlinear transmission line. The terahertz frequency doubler structure comprises an input waveguide-microstrip transition structure, a low-pass filter, a nonlinear transmission line, a band-pass filter and an output microstrip-waveguide transition structure which are cascaded in sequence. The nonlinear transmission line comprises a coplanar waveguide transmission line and a plurality of nonlinear capacitor devices arranged along the transmission direction of the coplanar waveguide transmission line. The nonlinear capacitor devices are connected in parallel to corresponding loading nodes of the coplanar waveguide transmission line. The equivalent capacitance of the nonlinear capacitor devices under working bias and the spacing between adjacent loading nodes are configured to regulate the dispersion relation of the nonlinear transmission line, so that the fundamental wave and the second harmonic satisfy the phase matching condition. The application regulates the capacitance of the nonlinear capacitor devices and the spacing between adjacent loading nodes, so that the fundamental wave and the second harmonic satisfy the phase matching condition, and the output efficiency of the target second harmonic is improved.

The application discloses a kind of based on full distribution nonlinear transmission line's ultra-wideband phase shifter, belong to communication technical field.The full distribution nonlinear transmission line includes: substrate and be located on the substrate heterojunction layer, as the cathode of Schottky diode ground line and as the signal line of Schottky diode anode are set on the heterojunction layer, cathode anode is connected through two-dimensional electron gas channel formed in heterojunction layer;The full distribution nonlinear transmission line is configured to receive anode bias by the signal line, to make the equivalent nonlinear capacitance of the Schottky diode change with the change of anode bias, and regulate the effective dielectric constant of the full distribution nonlinear transmission line.The application changes the equivalent nonlinear capacitance of Schottky diode by adjusting direct current bias applied on signal line, and then regulates the effective dielectric constant of full distribution nonlinear transmission line, realizes continuous, adaptive regulation and control to input signal phase.

This invention discloses a high-voltage nanosecond pulse shaping device and method based on magnetic devices. The device includes: a first magnetic transmission line and a second magnetic transmission line, with their input ends connected in parallel and connected to an initial pulse source; the output end of the first magnetic transmission line is connected to a load terminal; the output end of the second magnetic transmission line is short-circuited to ground; the first magnetic transmission line includes a first magnetic ring arranged along the axial direction and an outer magnetic field coil; the second magnetic transmission line includes a second magnetic ring arranged along the axial direction. Based on the current-dependent nonlinear permeability effect of the magnetic ring, this device simultaneously achieves pulse rise time compression, fall time truncation, pulse width shortening, and suppression of pre-pulse and tail oscillations through the rising sharpening effect of the first magnetic transmission line and the falling truncation effect of the second magnetic transmission line. This overcomes the limitation of single nonlinear transmission line or magnetic switching technology, which can only optimize single pulse parameters, and can obtain high-quality pulse waveforms at the load terminal.

A high frequency electromagnetic radiation generation device is disclosed that includes a high voltage input, a nonlinear transmission line, an antenna, and a pulse recirculating circuit. In some embodiments, the high voltage input may be configured to receive electrical pulses having a first peak voltage that is greater than 5 kV, and / or may be electrically coupled with the nonlinear transmission line. The antenna may be electrically coupled with the nonlinear transmission line and / or may radiate electromagnetic radiation at a frequency greater than 100 MHz about a voltage greater than 5 kV. The pulse recirculating may be electrically coupled with the high voltage input and the antenna. The pulse recirculating circuit may include a diode; a low pass filter; and a delay line. In some embodiments, unradiated energy from the antenna is directed through the pulse recirculating circuit to the nonlinear transmission line with a delay of less than 100 ns.

The invention belongs to the field of data signal transmission, and provides a 100M and gigabit Ethernet port lightning surge protection circuit and a transmission method aiming at the problems of incomplete protection of a single device, trigger delay, high misjudgment rate, poor universality and the like of traditional Ethernet port lightning surge protection. The circuit comprises four stages of structures, namely a nonlinear transmission line, a coarse protection line, a fine protection circuit and an isolation and recovery circuit which are sequentially connected in series for cooperative protection. The transmission method is based on the circuit, and the intelligent control chip executes and monitors a voltage / current baseline, learns a normal communication mode, identifies surge by using a nonlinear line deceleration effect, triggers coarse / fine protection, turns off a semiconductor switch in advance to cut off a surge path, monitors a line state, recovers communication or reports an error. According to the invention, surge full-energy coverage interception is realized, the trigger delay and the misjudgment rate are reduced, the 100M / Gigabit bandwidth adaptability is considered, and the anti-surge capability and the communication stability of the Ethernet port are greatly improved.

The invention discloses a digital program control dispatcher with a hierarchical impedance self-healing function and a control method, and the dispatcher comprises a business board which is provided with a mixed impedance self-adaptive matching circuit which is connected in series between a port driving chip and an external physical interface. The circuit is formed by connecting a passive self-adaptive matching unit close to an interface side and a digital control matching unit close to a driving side in series. The passive unit is used for performing nanosecond instantaneous passive matching on load impedance abrupt change based on a nonlinear transmission line principle; the digital unit carries out injection detection, analysis modeling and control of a programmable passive network, and carries out precise matching on slow-changing impedance. And through cooperation of the two, full-time-domain and high-precision impedance self-adaption from instant to long term is realized. According to the invention, the problem that the response speed, the matching precision, the reliability and the cost are difficult to consider at the same time in the prior art is solved, and the signal integrity, the equipment reliability and the economical efficiency of the communication port in a complex environment are remarkably improved.

The utility model belongs to the technical field of frequency synthesis, and particularly relates to a digital high-speed low-phase-noise broadband frequency synthesis system. The reference clock unit outputs a high-frequency low-jitter reference clock by combining frequency multiplication with a nonlinear transmission line on the basis of a constant-temperature crystal oscillator with ultralow phase noise; the power supply system adopts a DC-DC and LDO combined transformation mode to output an electric signal with low phase noise; the control system adopts a signal transmission mode of a local self-defined bus to realize high-speed transmission of data and complete rapid read-write of a register command; the frequency synthesis unit comprises a DDS chip, a filter and a low noise amplifier; the output ends of the reference clock unit, the power supply system and the control system are connected to the frequency synthesis unit. According to the invention, the digital broadband DDS chip is taken as a core and is matched with an external high-frequency low-jitter reference clock, a low-noise power supply system and a high-speed data control system, so that 10MHz-4GHz high-speed broadband low-phase noise signal output is realized.

This invention discloses a method, testing system, storage medium, and application for obtaining thin film thickness and refractive index. The method for obtaining thin film thickness and refractive index includes: using two sets of nonlinear transmission line terahertz frequency comb generators and a broadband mixer to obtain an intermediate frequency (IF) signal carrying transmission phase information; obtaining a measured phase curve based on the IF signal; constructing an equivalent multipath interference model of the thin film; coherently superimposing multiple reflection components of the measured wave signal within the thin film in the complex domain to obtain the complex phase of the total transmission field; obtaining a phase-frequency variation spectrum based on the complex phase as the model phase curve; constructing an error function between the model phase curve and the measured phase curve; and solving for the parameter combination that minimizes the error function by scanning the parameter combination of the thin film's refractive index (n) and thickness (d). This invention avoids thermal or temporal phase drift, thereby avoiding calculation errors caused by phase jumps.

A comb spectrum generator comprises a nonlinear transmission line circuit connected between a signal input end and a signal output end, and further comprises an input series matching circuit, the input end of the input series matching circuit is connected to the signal input end, and the output end of the input series matching circuit is connected to the nonlinear transmission line circuit, the input series matching circuit includes at least one first inductor and at least one first capacitor connected in series with the first inductor. According to the comb spectrum generator, the input series matching circuit is arranged at the front end of the nonlinear transmission line circuit, so that echo reflection generated in the comb spectrum generator after a high-power signal is input in a target input frequency range can be reduced; a high-power input signal can enter the nonlinear transmission line circuit without loss as far as possible, so that the high-power input signal is effectively converted into higher harmonic output, and the power conversion rate of the high-power input signal is improved.

A nonlinear transmission line (NLTL) comprises a plurality of interconnected transmission line cells, each including a shunt path and a transmission line length wherein the shunt path includes a varactor diode and an inductor coupled in series with the varactor diode.