193 results about "Microwave resonators" patented technology

A reflective impedance element is connected to a port of a composite right / left-handed transmission line, and operates at a predetermined operating frequency so that an impedance when the reflective impedance element is seen from the port becomes a pure imaginary number jB. A reflective impedance component is connected to a port of the composite right / left-handed transmission line, and operates at the predetermined operating frequency so that an impedance when the reflective impedance element is seen from the port becomes −jB.

Apparatus for measuring the composition and flow rate of a fluid (1) comprising a mixture of e.g. oil and water in a pipe (2), wherein an integrated mechanical structure (3) serves as a microwave resonator sensor for providing permittivity measurements and where the mechanical structure also functions as a differential pressure element for providing flow rate measurements.

Method and apparatus for the measurement of mass or density and / or for the measurement of the humidity in a plurality of portioned units in a non-metallic carrier material, which provides the following: a microwave measuring instrument, consisting of at least one microwave resonator for generating at least one resonance mode in a spatially limited measurement area and an analysing unit for analysing at least one variable of the at least one resonance mode, a conveying device for the carrier material, which transports the carrier material with the portioned units through the measurement area, the microwave measuring instrument measures at least one variable of the at least one resonance mode at a time when only the carrier material without portioned unit is in the measurement area, and at a time when the portioned unit is at least partially in the measurement area, the analysing unit subtracts the variable measured for the carrier material from the measurement values for the portioned unit, and determines a value of the humidity and / or of the mass or density of the portioned unit from at least one difference by way of an input-output map.

A double-resonance structure for DNP-NMR experiments and / or ENDOR experiments and methods using such a double-resonance structure. The double-resonance structure comprises a microwave resonator for generating electromagnetic fields suitable for EPR and an HF resonator for generating electromagnetic fields suitable for NMR. The HF resonator is formed by a strip resonator, a section of the strip resonator at the same time forming a portion of the microwave resonator.

Devices for modification of a microwave signal using a magnetically saturated ferrite magnetoelectric device with electrical control are disclosed. The device is useful for microwave resonators, band pass filters, delay lines and phase shifters.

A microwave to optical conversion device comprising:a superconducting microwave resonator, andan optical resonator including an electro-optical material,the superconducting microwave resonator and the optical resonator being arranged one with respect to the other so as to be electro-magnetically coupled.

A system and method for determining a density of a non-conducting medium in a tank is disclosed where the relationship between a dielectric constant and a density of the medium is known. The system comprises a transceiver, and a waveguide, the waveguide extends towards and into the medium. The system further comprises a first microwave resonator located along the waveguide. The first microwave resonator has a resonance frequency, which depends on a dielectric constant of a medium surrounding the resonator according to a known relationship, and is arranged to reflect a portion in the frequency domain of a signal being guided along the waveguide. The system further comprises processing circuitry connected to the transceiver and configured to determine the resonance frequency based on a received reflected signal, and to determine a density of the medium at the location of the first microwave resonator based on the resonance frequency.

Provided is a coagulation apparatus using cold plasma. In the coagulation apparatus, the cold plasma is generated by a microwave resonator with low power consumption in the atmosphere, and the cold plasma is vented on a bleeding portion of a wound. Accordingly, it is possible to accelerate coagulation process, to reduce unfavorable side effect such as burns on the wound, and to efficiently sterilize the wound, simultaneously. In addition, it is possible to implement a small-sized portable coagulation apparatus.

A measurement technique based on a microwave near-field scanning probe is developed for non-contact measurement of dielectric constant of low-k films. The technique is non-destructive, non-invasive and can be used on both porous and non-porous dielectrics. The technique is based on measurement of resonant frequency shift of the near-field microwave resonator for a plurality of calibration samples vs. distance between the probe tip and the sample to construct a calibration curve. Probe resonance frequency shift measured for the sample under study vs. tip-sample separation is fitted into the calibration curve to extract the dielectric constant of the sample under study. The calibration permits obtaining a linear calibration curve in order to simplify the extraction of the dielectric constant of the sample under study.

The device for measuring the mass and / or the moisture of a material running through a spinning preparation machine is distinguished in that it has a microwave resonator (15, 18) and associated adapted measurement electronics. The method for measuring the mass and / or the moisture of a material running through a spinning preparation machine is distinguished in that the measurement is carried out with the aid of microwaves.

The invention relates to a measuring arrangement for measuring the density of a product by means of microwaves. The measuring arrangement comprises a first microwave resonator, from which, in operation, microwaves enter a product area, and a device for compensating for environmental influences and disturbance variables affecting the measuring signal of the first microwave resonator. According to the invention, the compensation device comprises a second microwave resonator, which is shielded towards the product area with respect to microwave radiation.

A tunable millimeter-wave (mmw) DNP probe head is disclosed that is compatible with efficient H / X / Y / e− DNP in samples that may have volume large compared to λ03, where λ0 is the free-space wavelength at the frequency fe of the electron paramagnetic resonance (EPR) when placed in an external polarizing field B0, where B0 is typically in the range of 6.5 T to 35 T, corresponding to fe in the range of 180-1000 GHz, and corresponding to proton resonance frequency fH in the range of 280 MHz to 1500 MHz. The probe head comprises a tune cavity of adjustable volume, a sample cavity that is large compared to the sample wavelength, a tapered conical feed transition filled with a high dielectric material at the small end, and a selectively reflective wall that is substantially reflective of electromagnetic radiation at fe but substantially transparent to electromagnetic radiation at fH.

The invention relates to a system and method for measuring resonant frequency of near-field microwave resonator, which utilizes electron spin resonance and diamond nitrogen vacancy defect (NV color center) to pull the oscillation frequency and the intensity of the microwave to place the diamond in a static magnetic field. In the process, the microwave pulse frequency and the magnetic field intensity are changed to perform photodetection magnetic resonance and rabbi oscillation measurement, and a series of rabbi oscillation frequencies are obtained, from which the resonator resonance frequencyis extracted. The measuring system comprises an optical module, a microwave module, a magnetic field device, a diamond and a control device, wherein the diamond is embedded with a NV color core; theoptical module can generate and guide light to the diamond, and simultaneously detect the fluorescent signal emitted by the diamond. The microwave module can generate a microwave control field and load it onto the diamond. The magnetic field device can generate a static magnetic field. The invention can measure the resonant frequency and the effective magnetic field strength of the microwave resonator practically and accurately, has high precision, and can be used under near-field conditions.

The application relates to a microwave sensor for measuring a dielectric property, especially the density and / or moisture content of a product, having a microwave resonator, wherein a product introduced into the resonator interacts with a resonant microwave field generated in the resonator in order to determine suitable measured quantities, and is characterised in that at least two half-waves of the electric field are formed in the resonator in one direction, the product feed being effected in at least one region of high field intensity of one of the half-waves of the electric field.

In an atomic oscillator of an optical pumping system, a slot line resonator, as a microwave resonator, is arranged in a portion where atoms are excited. The slot line resonator forms a microstrip line inputting microwaves so as to be orthogonal to a slot line with a dielectric substrate being sandwiched therebetween. A container in which the atoms are enclosed is mounted on the slot line resonator, and the slot line resonator and the container are covered with a metallic case having a pumping light passage hole and a photo element.

The method of detecting foreign bodies in continuous mass streams of fibrous material, strand-like material or material similar to bulk goods with the aid of microwaves, in which the mass flow is led through the field of a microwave resonator and in which the change (A) in the resonant frequency, effected by the material, and the change (B) in the width of the resonance curve of the microwave resonator is determined, is distinguished in that the ratio (B / A) of the changes is evaluated and compared with corresponding averages, and the presence of a foreign body is reported when the ratio differs from the averages by more than a predefined value.

A microwave resonator device (1), being configured in particular for electron spin resonance measurements, comprises a resonator being resonant with first and second microwave field modes and including first and second resonance sections (7, 8) arranged along a longitudinal axis (2) of the resonator, and a coupling unit being arranged between the first and second resonance sections, wherein the coupling unit includes a conducting plate (16) being arranged on the longitudinal axis (2) and covering a central portion of a cross-sectional area of the resonator, the conducting plate (16) is adapted to adjust a first mode frequency of the first microwave field mode, and the conducting plate (16) is arranged at a field minimum of the second microwave field mode. Furthermore, a method of conducting an electron spin resonance measurement with a sample to be investigated is described.

The invention belongs to the technical field of electronic materials and devices, and discloses a tunable dielectric barium strontium titanate based composite silicate ceramic dielectric material and preparation thereof. The tunable dielectric barium strontium titanate based composite silicate ceramic dielectric material has a component formula of (1-m%)Ba1-zSrzTiO3+m%(Sr1-xAx)2(Zn1-yBy)Si2O7, wherein A is selected from Ba or Ca; B is selected from Co, Mg, Mn or Ni; the numerical value range of x is not smaller than 0 and not more than 1; the numerical value range of y is not smaller than 0 and not more than 1; the numerical value range of z is not smaller than 0.4 and not more than 0.6; and the numerical value range of m% is more than 0wt% and smaller than 100wt%. The tunable dielectric barium strontium titanate based composite silicate ceramic dielectric material of the invention is high in Q (Quality) value, low in dielectric constant and high in dielectric tunable rate, and can bewidely applied to preparation of tunable microwave elements and devices such as electric tuning microwave tuners, filters, microwave dielectric antennae and the like.

A microwave resonator apparatus (35) includes a microwave resonant cavity (36) in fluid communication chamber (38) are dimensioned to ensure high attenuation of resonant electromagnetic fields without impeding fluid flow. The resonant properties of the cavity (36) are therefore completely insensitive to variations in the volume of the pressure chamber (38). The resonator has a specialised reentrant geometry. Consequently, two of the cavity's resonant modes depend sensitively upon the formation and volume of any liquid phase present in the cavity. The apparatus and the method are suitable for measuring dielectric properties and phase envelope of fluid mixtures (such as a gas condensate fluid). The apparatus can be used for making several phase envelope measurements without risk of contamination.