39 results about "Antenna geometry" patented technology

A compact, hand-held device for wireless powering, interrogation and data retrieval from at least one implanted sensor. The hand-held device includes an antenna for powering an implanted sensor and for receiving data from the implanted sensor to the hand-held device for at least one of storage, display or analysis. The hand-held device establishes electromagnetic coupling with a low radiating radio frequency power inductor in the implanted sensor at a predefined separation and the antenna geometry allows for the antenna to power, interrogate and retrieve data from the implanted sensor without strapping the hand-held device to a human body housing the implanted sensor The hand-held device optionally allows for activation of the implanted sensor only during interrogation and data retrieval.

The inductively coupled plasma source and antenna geometry are significant factors in determining plasma and process uniformity inside the chamber. Growing demands for processing larger and larger wafers or LCD substrates and providing higher and higher degrees of plasma uniformity challenge the current ICP type antenna designs and push development of sources. Branching RF antenna, featuring a plurality of major and minor branches, provides improved coverage of processing area, reduced standing wave effect, improved uniformity of inductively coupled electromagnetic field, more uniform plasma production, and more homogeneous processing conditions throughout the whole processing area.

A method for designing a high performance, small antenna that is matched to a required output impedance, does not require filtering, is simple and inexpensive to manufacture, and is easily integrable with an RF power amplifier- with minimum cost, minimum external components and minimum energy losses. The method includes finding a singular point (102) in the impedance vs. antenna geometrical dimension/wavelength ratio graph, the singular point (102) exhibiting a high very high positive reactance, setting the antenna geometry to match this point, and canceling the very high positive reactance (high inductance) resulting from this match by adding to the antenna a very small capacitance, preferably provided by at least one gap capacitor (202) The antenna is preferably a loop antenna (200), and both the antenna and the gap capacitor (202) (204) are preferably implemented by printing methods on printed circuit board or ceramic substrates. The antenna (200) may also be implemented in non-differential designs.

The production and emission of high-energy microwave pulses are made possible by means of a device with a particularly compact design if the capacitor column (12-12) of the Marx generator (11) whose series circuit conventionally itself feeds a microwave generator with a matched antenna geometry, is now itself used—dispensing with the microwave generator and its antenna—directly as a resonator and Hertzian antenna dipole (24). Its oscillation response can be optimized by triggered spark gaps (14) for the switching of capacitors (12), and by means of plates (19) connected at the ends, in order to increase the stray capacitances.

The invention discloses a GNSS attitude real-time measurement device and measurement method based on three antennas, and belongs to the technical field of measurement and surveying and mapping. A three-antenna GNSS receiver structure is adopted, and an azimuth angle, a pitch angle and a roll angle of a plane where the antennas are located are obtained by measuring carrier phase difference values of GNSS satellite signals received by the three antennas; due to the fact that satellite signals are updated and resolved in real time, the problem of error accumulation does not exist, high-precisionreal-time attitude measurement can be achieved, and positioning and attitude measurement are integrated. The three antennas can be placed at will without being limited by geometrical shapes of the antennas, and compared with a single-point positioning attitude measurement system and other attitude measurement systems, the precision is high, and the real-time performance is good; compared with a double-antenna RTK receiver, a three-dimensional attitude angle can be obtained; and according to the invention, GNSS signals are used for position, baseline and attitude calculation, and the system canautomatically calculate the azimuth angle, the pitch angle and the roll angle.

A self-structuring antenna (SSA) system selects a predetermined antenna geometry as a preliminary configuration based on a particular communication band in which the SSA system is operating. The preliminary configuration provides an initial or default antenna configuration for the particular communication band. The SSA system may use a preliminary configuration when the communication system is first activated. In addition, the SSA system may use a predetermined antenna geometry as a general purpose default configuration until a configuration producing better antenna characteristics can be identified.

The invention relates to an umbrella antenna average power pattern modeling method considering surface patch splicing error, which comprises the following steps of: inputting umbrella antenna geometryand electric parameters; the far field of the ideal antenna is calculated under the optimal focal length and the optimal focal length of the umbrella antenna. Reflector triangular mesh generation; the nodal transformation matrix of the patch splicing error and the element node displacement and the element center displacement of the umbrella antenna is calculated. The Overall Transformation Matrixbetween the Node Displacement and the Center Displacement of the Group Element; the first derivative of the element and the second Hessian matrix of the electric field relative to the node displacement of the element are calculated. The global first derivative of the group electric field relative to the node displacement of the element, the second order Hessian matrix; the total first derivativeand second order Hessian matrix of the far field and the random error of the electric field relative to the center point of the element are calculated under the patch splicing error. RMS value of input surface random error; calculating an average value of the far-field radiation power of the antenna; judging whether the electrical performance is satisfied; outputting radiated power pattern; updatingthe surface random error rms value.

The invention discloses an electromechanical integration optimization design method for an umbrella-shaped antenna under an optimal focal distance. The method comprises the steps of inputting a geometrical parameter, a material parameter and an electrical parameter of the umbrella-shaped antenna; calculating the optimal focal distance of the umbrella-shaped antenna; calculating an ideal antenna far electric field under the optimal focal distance; calculating the number of segments of antenna ribs; calculating coordinates of points on the ribs; calculating the coordinates of the points between the adjacent ribs; generating all node coordinates of the umbrella-shaped antenna; establishing a structure finite element model of the umbrella-shaped antenna under the optimal focal distance; generating first-order and second-order coefficient matrixes of total electrical property under the optimal focal distance; solving the structure finite element model under the optimal focal distance; approximately calculating a variation of the far electric field of the umbrella-shaped antenna under the optimal focal distance; calculating the far electric field of the umbrella-shaped antenna under the optimal focal distance; judging whether the electrical property meets the requirement; outputting an antenna structure design scheme; and updating the antenna parameters. According to the method, surface patch splicing characteristics of the umbrella-shaped antenna are considered, the electrical property under the optimal focal distance is acquired based on a second-order approximate calculation formula, and the electromechanical integration optimization design efficiency can be improved.

Certain embodiments for antenna geometry for multiple antenna handsets may include receiving RF signals via a patch antenna coupled to a signal processing circuitry within a mobile terminal. The signal processing circuitry may process the RF signals, comprising at least one of a plurality of polarizations that are received by the patch antenna. The patch antenna may be a dual-polarized antenna, and may comprise a plurality of ports. RF signals at a first of the plurality of ports may be orthogonally polarized with respect to RF signals at a second of the plurality of ports. The patch antenna may be optimized to receive multiple RF bands. Each of the multiple RF bands may be communicated via different ports to be processed.

The invention discloses a Koch snowflake ultra-wideband reverse modeling method based on an IACO-BRBP neural network, and the method mainly comprises the steps: 1, obtaining experimental data, and dividing the experimental data into a training set and a test set; 2, improving a traditional ant colony algorithm; 3, training the BRBP forward model by using the improved ant colony algorithm, and storing the optimized weight; 4, keeping the weight unchanged, and inputting an electric parameter in the established IACO-BRBP model to realize a reverse solving process; 5, calculating an evaluation function between the output parameter and the target parameter; 6, updating the input parameters by using a reverse iteration algorithm. According to the method, the IACO-BRBP neural network reverse modeling method is applied to the improved Koch snowflake-type ultra-wideband antenna, so that corresponding structural parameters can be solved according to given antenna electrical parameters; once the training of the reverse model is completed, the geometric parameters of the antenna can be quickly simulated only by inputting target electrical parameters; therefore, the design period is greatly shortened while the design requirement is basically met.

Position determination of user equipment (UE) is supported using channel measurements obtained for Wireless Access Points (WAPs), wherein the channel measurements are for Line of Sight (LOS) and Non-LOS (NLOS) signals. Based on WAP almanac information and the channel measurements, channel parameters indicative of positions of signal sources relative to a first position of UE may be determined. Using the first position of the UE and an association of the signal sources with corresponding channel parameters, a second position of the UE may be determined. The position of the UE may be a probability density function. Additionally, position information for signal sources may be determined, such as a probability density function, as well as signal blockage probability and an antenna geometry and the WAP almanac information may be updated accordingly.

The invention provides a plasma processing apparatus and method which allow switching between E and H operation modes and also increase the coupling efficiency of the RF power to the plasma. The apparatus may increase plasma density by a factor of about 1.25-1.65 for a given power output. Simultaneously, due to the high efficiency, the need to cool the antenna may be eliminated. A new antenna geometry which increases the amount of surface area for a given volume is used to take advantage of skin effects associated with RF electric current. In some embodiments, the antenna has a single turn to reduce proximity effects. The antenna may also be embedded in a ferrite material to further optimize performance.