11 results about "Very high frequency" patented technology

A plasma processing system is disclosed. A very high frequency (VHF) generator delivers power to a plasma chamber, and a mid-frequency (MF) generator delivers power to the plasma chamber. The VHF generator includes a sensor configured to provide a signal indicative of an impedance of a plasma load that is presented to the VHF generator. The VHF generator further includes a frequency tuner configured to adjust a frequency of the VHF generator within a cycle of the MF generator based on the signal to mitigate impedance modulation caused by the MF generator. Impedance modulation may also be mitigated by a sync line between the VHF and MF generators that allows presetting the VHF generator frequency in synchronization with a cycle of the MF generator.

The application provides a construction method of a simulation antenna of a very high frequency sensor, which comprises the following steps: establishing a geometric model of a simulation antenna corresponding to an entity very high frequency sensor antenna; constructing an equivalent circuit model of a lumped parameter element of the simulation antenna, the lumped parameter element being connected with the geometric model; obtaining geometric parameters of the geometric model; determining initial parameters of the equivalent circuit model based on input impedance parameters of the entity very high frequency sensor antenna; adopting a simulation partial discharge source to emit a simulation partial discharge pulse current corresponding to an actual partial discharge signal, comparing a simulation signal obtained by the simulation antenna with a measured signal measured by the entity very high frequency sensor antenna, and adjusting the equivalent circuit model according to a comparison result, so that the simulation signal is consistent with the measured signal.

This invention provides a method for evaluating the performance of ultra-high frequency (UHF) sensors based on threshold attenuation coefficient comparison. The method includes: determining the placement positions of a first UHF sensor and a UHF sensor under test; acquiring partial discharge (PD) UHF signals using the UHF sensor under test; performing simulation modeling of a transformer device and detecting the electric field strength using an ideal probe; calculating the attenuation coefficient A1 of the PD UHF signal in the dielectric window based on the physical parameters of the transformer device; calculating the attenuation coefficient A2 of the PD UHF signal propagating in the transformer; and calculating the threshold attenuation coefficient A of the PD UHF signal based on the above attenuation coefficients. 总 The performance status of the UHF sensor under test is determined by comparing the threshold attenuation coefficient with the actual attenuation coefficient. This invention proposes a verification method for UHF sensors embedded in transformers, improving the accuracy and reliability of on-site verification of UHF sensors.

The utility model discloses a kind of test equipment of very high frequency radio, wherein including test equipment bottom plate assembly, the upper surface of test equipment bottom plate assembly is equipped with support frame, the upper surface of test equipment bottom plate assembly is equipped with protective housing, the inside surface of protective housing is equipped with detection mainboard assembly, the upper surface of protective housing is equipped with limit frame, the upper surface of protective housing is limited and connected with upper cover plate.This device when user needs to test very high frequency radio, user needs to place very high frequency radio on processing horizontal plate, then user needs to open detection mainboard assembly by first controller, and by the detection head assembly of setting, user can detect very high frequency radio placed on processing horizontal plate, and after user starts telescopic link, telescopic link can push processing horizontal plate to move up and down, so that user carries out high-quality test to very high frequency radio.

The invention relates to a flip-chip integrated circuit package of the ball array type, wherein:the underside of the package includes a plurality of receiving pads for signal, ground and solder balls;stacks of signal and ground vias, electrically connected to respective receiving pads, pass vertically through the package's dielectric body forming a quasi-coaxial structure. In an upper part of the package body:the signal vias are electrically connected to a lesser number of signal conductive bumps protruding from the upper surface of the package's dielectric body; andat least two ground vias are connected by means of conductive projections to respective ground conductive bumps, forming a ring around the signal conductive bumps.

This invention provides a multi-level diagnostic link status indication device for VHF data exchange systems, relating to the technical field of communication equipment monitoring. It includes: a multi-level signal acquisition module, a cross-layer correlation diagnostic module, an intelligent visualization indication module, and a visible range extension structure. The output of the multi-level signal acquisition module is connected to the input of the cross-layer correlation diagnostic module; the output of the cross-layer correlation diagnostic module is connected to the input of the intelligent visualization indication module; the intelligent visualization indication module includes: a three-dimensional LED dot matrix and a buzzer. This invention utilizes the multi-level signal acquisition module and the cross-layer correlation diagnostic module to achieve full-dimensional parameter monitoring from physical layer signal degradation to protocol layer anomalies, eliminating the single-dimensional detection blind spots of traditional solutions.

The application provides a land-air communication sound source identity identification method, an air traffic control system and a readable storage medium. The land-air communication sound source identity identification method comprises the following steps: acquiring an RSSI value corresponding to a very high frequency receiver of a very high frequency station according to a preset acquisition frequency; judging whether the RSSI value is greater than a first threshold value, and if yes, recording a current time stamp as a start time stamp; after recording the start time stamp, judging whether the RSSI value is less than or equal to the first threshold value, and if yes, recording a current time stamp as an end time stamp; calculating an arithmetic mean value of all RSSI values collected between the start time stamp and the end time stamp; and if the arithmetic mean value is greater than or equal to a second threshold value, determining that the sound source identity is a controller, and if the arithmetic mean value is greater than the first threshold value and less than the second threshold value, determining that the sound source identity is a pilot. The application further provides an air traffic control system and a readable storage medium applying the method. The method can efficiently, accurately, reliably and conveniently realize land-air communication instruction acquisition, segmentation and speaker differentiation.

The present invention discloses a two-way radio, typically a marine VHF radio, integrating a satellite distress alert transmitter, sharing much of the radio hardware with the satellite transmitter, while enabling good functionality of both, for search and rescue of people in distress.

Process for preparing ferrite magnetodielectric materials for VUHF application The present invention relates to a process for preparing a ferrite material, said process comprising the following steps: a step S1 of grinding ferrite particles P1 with grinding balls B1, to obtain ferrite particles P2, the diameter d90 of the ferrite particles P2 being less than the diameter d90 of the particles P1, said step S1 being carried out at an energy E1 greater than 1.5 kWh / kg and a step S2 of grinding the ferrite particles P2 with grinding balls B2, to obtain ferrite particles P3, the diameter d90 of the ferrite particles P3 being less than the diameter d90 of the particles P2, said step S2 being carried out at an energy E2 greater than 5 kWh / kg, and the diameter of the balls B1 being greater than the diameter of the balls B2.The invention also relates to a ferrite magneto-dielectric material obtained by such a process, intended for use in the VUHF frequency band. Figure for the abstract: none.

The present invention relates to a lighting system for a vehicle. The lighting system includes a front left lighting device and a front right lighting device each able to project a lighting beam, means for emitting a high-frequency coded luminous signal outside the vehicle, and means for receiving such a luminous signal. The lighting system includes a luminous device arranged on the vehicle between the lighting devices, obstacle detection means, and means for decoding a luminous signal received by the luminous device, able to provide at least one value representing a time shift between the luminous signal received by the luminous device and a luminous signal sent by the luminous device to the obstacle detection means.