5 results about "Microwave frequency range" patented technology

A non-invasive analyte sensor includes at least one transmit antenna and at least one receive antenna. A transmit circuit is electrically connectable to the at least one transmit antenna, where the transmit circuit is configured to generate a transmit signal in a radio or microwave frequency range of the electromagnetic spectrum. A receive circuit is electrically connectable to the at least one receive antenna. A trigger mechanism is associated with the non-invasive analyte sensor that triggers an analyte reading by the non-invasive analyte sensor.

The invention relates to the field of LED luminescent materials, solves the problems of harsh synthesis conditions and high production cost of narrow-band green fluorescent powder in the prior art, and provides a narrow-band green fluorescent powder preparation method based on composite nucleation and an LED package. The method comprises the following steps: weighing raw materials according to a first preset ratio; preparing a nucleating agent according to a second preset ratio; uniformly mixing the pretreated raw materials with the nucleating agent to obtain a mixture; putting the mixture into a double-layer crucible; a reaction atmosphere is established in the reaction furnace, and the pressure in the reaction furnace is controlled to reach the target pressure; applying a microwave field in the reaction furnace according to a preset microwave frequency range to sinter the mixture, heating to a first target temperature interval, and preserving heat to obtain a sintered material; and quickly cooling the sintered material to obtain the narrow-band green nitrogen oxide fluorescent powder. The preparation difficulty and production cost of beta-Sialon: Eu are reduced, and the method is suitable for industrial production.

This invention claims protection for a method for selectively heating multilayer materials using microwaves based on a preferred frequency, comprising the following steps: S1, constructing a microwave heating system model based on the structure, dielectric properties, and geometric model of the microwave heating cavity of the multilayer material; S2, dividing a preset microwave frequency range into several frequency steps, obtaining temperature distribution data of each layer of the material at each frequency through multiphysics simulation, and establishing a frequency-temperature distribution correlation database; S3, calculating the temperature difference between the target layer and the non-target layer at different frequencies, and constructing an interlayer temperature difference control function; S4, selecting a preferred frequency sequence that maximizes the temperature difference between the target layer and the non-target layer through the interlayer temperature difference control function, and dynamically adjusting the frequency sequence according to the interlayer temperature difference threshold; S5, sequentially outputting microwave frequency control signals according to the preferred frequency sequence to perform time-segmented frequency-varying heating of the multilayer material, obtaining the result that the target layer is selectively heated while the temperature of the non-target layer remains at a low level.

Various embodiments provide a generator unit for generating microwave electromagnetic energy and radiofrequency electromagnetic energy for being supplied to an electrosurgical instrument. The generator unit comprises a first coaxial port configured to be connected to a first coaxial cable, the first coaxial port including a first inner connector and a first outer connector separated by a first dielectric material. The generator unit comprises a second port configured to be connected to an electrical line configured to convey a direct current and / or the radiofrequency electromagnetic energy. The generator unit comprises a first microwave source configured to generate the microwave electromagnetic energy in a first microwave frequency range for being supplied to the first coaxial port. The generator unit comprises a radiofrequency source configured to generate the radiofrequency electromagnetic energy in a first frequency range offset from the first microwave frequency range, the radiofrequency source including a first output and a second output. The radiofrequency source is configured to be coupled to the first coaxial port and the second port such that the first output is electrically connected to the first outer connector, and the second output is electrically connected to the second port. Some other embodiments provide an electrosurgical instrument and an electrosurgical system.

The invention discloses a microwave radiation and fluorescence enhancement method for a vehicle-mounted quantum magnetic compass, and the method comprises the steps: designing the width of a microstrip line, and calculating the width size of the microstrip line through the type of a given known material and the thickness of a dielectric constant substrate; the method comprises the following steps: designing a gap ring resonance structure, determining a required microwave frequency range under a given magnetic field, and calculating size information of each parameter of the gap ring resonance structure according to an intermediate value of the microwave frequency range; coupling oscillation of the microwave and the resonance structure is designed; a uniform metal film layer with a smooth mirror surface is prepared through a deposition process, so that reflection collection of a fluorescence signal and a pump laser light source is realized, and the fluorescence collection efficiency is improved. According to the invention, microwave intensity enhancement is realized, a uniform microwave field is provided in a certain area so as to realize synchronous driving of a color center ensemble, fluorescence collection enhancement can be realized at the same time, and fine tuning on structural size parameters can adjust different working frequencies through simulation software.