82 results about "RF probe" patented technology

A system for ablating lesions in the interior regions of the human body including a RF catheter and a control system adapted to facilitate the automatic step deployment of an array-type energy delivery system positioned within the catheter. The RF catheter and control system further include an auto array deployment mechanism coupled to the array-type energy delivery system and an impedance and temperature monitoring system. In addition, the system includes a probe positioning device adapted to maintain a RF probe in a desired orientation during ablation procedures.

A radio frequency sensing, control, and particulate matter diagnostics network and system and method and, more specifically, a radio frequency particulate filter diagnostics system comprising a housing including an inlet connected to a source of particulate matter, a particulate filter in the housing and adapted for filtering the particulate matter, and a radio frequency sensor adapted to detect conditions of abnormal particulate filter or system operation and including at least one radio frequency probe configured to be in contact with the housing for the particulate filter housing and adapted to receive radio frequency signals and a radio frequency control unit in communication with the radio frequency probe.

The present invention generally provides methods and apparatus for controlling ion dosage in real time during plasma processes. In one embodiment, ion dosages may be controlled using in-situ measurement of the plasma from a mass distribution sensor combined with in-situ measurement from an RF probe.

The subject invention pertains to an imaging technique and apparatus which can utilize an array of RF probes to measure the non-resonant thermal noise which is produced within a sample, such as a body, and produce a non-resonant thermal noise correlation. The detected noise correlation is a function of the spatial overlap of the electromagnetic fields of the probes and the spatial distribution of the conductivity of the sample. The subject technique, which can be referred to as Noise Tomography (NT), can generate a three-dimensional map of the conductivity of the sample. Since the subject invention utilizes detection of the thermal noise generated within the body, the subject method can be non-invasive and can be implemented without requiring external power, chemicals, or radionuclides to be introduced into the body. The subject imaging method can be used as a stand along technique or can be used in conjunction with other imaging techniques.

A magnetic resonance imaging apparatus and method having a magnet assembly, which provides substantially flat surfaces of constant magnetic field outside the assembly and a set of magnetic field gradients. One-, two-, and three-dimensional images are rendered. The static magnetic field is virtually uniform within horizontal degrees of freedom and decreases monotonically in a direction away from the surface. An RF probe, for example, a coil, located adjacent the surface, produces a field substantially perpendicular to the static magnetic field. A magnetic field gradient is set to horizontally scan a given level within the sensitive volume. Received magnetic resonance signals are detected by the coil for a depth corresponding to the excitation frequency. As the tuning and excitation frequency is switched to lower values, signals are generated for layers progressively farther from the surface. The RF probe is automatically tuned. Depth profiles are rendered by concatenating the signals collected at various frequencies. Horizontal resolution is attained by the use of controlled magnetic field gradients.

An Antenna measurement system incorporating high speed tracking laser-based global positioning capture synchronized with radio frequency (RF) measurements. A high speed tracking laser is used for collecting RF probe position data synchronously with corresponding near-field RF measurements. The probe may be moved across an arbitrary surface surrounding or adjacent to a device under test (DUT); however, it is not necessary for the probe position to be perfectly coincident with the surface, or any of the discrete points which make up the surface. Here, the probe position is determined relative to a global positioning coordinate system which is defined by a set of monuments which are in known positions relative to the global positioning coordinate system, and not the DUT. Any difference between the actual position of the probe, in the global position coordinate system, and a given one of the discrete measuring points, in the global position coordinate system, on the surface surrounding or adjacent to the DUT can be accounted for during post processing, thus eliminating the need for advanced or intermittent calibration to achieve precise near-field measurements.

An impedance measuring apparatus includes a plurality of RF (radio frequency) probes; a plurality of rotation mechanisms coupled to the plurality of RF probes, respectively; a processing unit, and a mechanical controller. The mechanical controller controls the plurality of rotation mechanisms and the plurality of RF probes to measure package RF signals between terminals formed on a package substrate. The processing unit measures calibration RF signals between terminals formed on at least one calibration substrate; determines RF impedances of the package substrate from the package RF signals and phase differences corresponding to a thickness of the package substrate and distances between the terminals on the package substrate from the calibration RF signals, and calibrates the RF impedances based on the phase differences.

High reflection load pull tuners are proposed, which include two or more RF probes, placed in series into the same slotted airline (slabline) and being controlled simultaneously horizontally and vertically by remote electric control, allowing the creation of controlled reflection factors which are distributed over and cover the entire Smith Chart, from very low reflection factors up to very high reflection factors and a method allowing to align such tuners and to calibrate such tuners on a vector network analyzer.

Systems and methods for monitoring rotating machinery are disclosed. Transmitter and receiver antennas can be provided with access to the rotating machinery. At least one receiver signal resulting from at least one transmitter signal that has propagated through a portion of the rotating machinery can be obtained. A first signal pair can be formed from a first receiver signal and a first transmitter signal, or from first and second receiver signals obtained from spatially-separated receiver antennas, or from first and second receiver signals which are attributable to different transmitter signals. Amplitude and phase information of a plurality of frequency components for each signal in the first signal pair can be determined. A set of comparison values for the first signal pair can be determined by comparing respective frequency component phases or respective frequency component amplitudes. A characteristic of the rotating machinery can then be analyzed using the comparison values.

NMR probe coils designed to operate at two different frequencies, producing a strong and homogenous magnetic field at both the frequencies. This single coil, placed close to the sample, provides a method to optimize the NMR detection sensitivity of two different channels. In addition, the present invention describes a coil that generates a magnetic field that is parallel to the substrate of the coil as opposed to perpendicular as seen in the prior art. The present invention isolates coils from each other even when placed in close proximity to each other. A method to reduce the presence of electric field within the sample region is also considered. Further, the invention describes a method to adjust the radio-frequency tuning and coupling of the MAR probe coils.

Multi-segment RF probes for automatic slide screw impedance tuners include a multitude of slugs, which are individually adjustable towards the center conductor of the slabline and spaced against each-other in order to create the required capacitance and transmission line space values needed for synthesizing resonant networks to match arbitrary reflection factor patterns over a given frequency range. The multi-segment probes are optimized using network synthesis software within the limits of the capacitance and inductance values allowed by the hardware. The probes allow constant phase testing for 100 MHz bandwidths or more.

A cable to waveguide transition apparatus having a signal accumulation form of a backshort is disclosed. The cable to waveguide transition apparatus having a signal accumulation form of a backshort, includes: a waveguide; a RF probe for transferring a radio frequency (RF) signal to the waveguide; and a backshort having the signal accumulation form for reflecting the RF signal excited from the RF probe, wherein the backshort reflects a first fundamental frequency signal excited from the RF probe to have a phase identical to a phase of a second fundamental frequency signal excited from the RF probe to an aperture of the waveguide, and reflects a first 2-order harmonic frequency signal excited from the RF probe to have a phase reverse to a phase of a second 2-order harmonic frequency signal excited to an aperture of the waveguide in order to eliminate the 2-order harmonic frequency signal.

An antenna that includes a radial waveguide defining a waveguide region between opposed first and second surfaces. A radio frequency (RF) probe is disposed in the waveguide region for generating RF signals, and a plurality of radiating slot antenna elements are disposed on the first surface for emitting the RF signals from the waveguide region. A plurality of spaced apart conductive elements are disposed within the waveguide region. The antenna includes tunable elements that each include a quarter wavelength RF choke coupled through a variable capacitance and an inductive line to a respective one of the conductive elements. A plurality of DC control lines are provided, with each DC control line being connected to at least one of the tunable elements to adjust the variable capacitance thereof. A control circuit is coupled to the DC control lines and configured to selectively apply DC current values to adjust the variable capacitances of the tunable elements to control a propagation direction of the RF signals from the RF probe.