56 results about "Fractional bandwidth" patented technology

This disclosure demonstrates a new class of Ultra-Wide Band (UWB) AMC with very large fractional bandwidth (>100%) even at lower frequencies (<1 GHz). This new UWB AMC is enabled by recognizing that any AMC must be an antenna in order to accept the incident radiation into the circuit. Therefore, by using UWB antenna design features, one can make wide band AMCs. Additionally, by manipulation of the UWB AMC element design, a 1 / frequency dependence can be obtained for instantiating the benefits of a quarter wave reflection over a large UWB bandwidth with a single physical thickness.

A transducer according to various aspects of the present invention provides high fractional bandwidth with relatively low degradation of the pulse duration and sensitivity. The transducer includes a back matching layer behind the transducer material. The back matching layer is characterized by an impedance selected to transmit a selected portion of the backwards propagating acoustic energy to an absorption layer. The remaining acoustic energy is reflected in the desired direction of propagation. As a result, the transducer provides enhanced bandwidth without excessive loss of sensitivity or increase in pulse duration.

A system to provide fractional bandwidth data transmission includes a network processor, physical layer device, or link layer device {“data device”) and a plurality of link layer devices that are coupled to a plurality of input-output ports. The link layer devices are coupled in a serial daisy chain fashion and pass data via a plurality of data channels. The first linked layer device is coupled to the data device and receives data therefrom and the last linked layer device is coupled to the data device and transmits data thereto forming a ring network that includes all of the link layer devices and the data device. Data received from the data device is contained in data packets that contain a destination identifier and the data. Each link layer device receives input data packets and separates the data packets based on the destination identifier contained therein. Data packets having a destination identifier corresponding to one of the plurality of input-output ports coupled to that particular linked layer device are diverted to the identified input-output port. The remaining data, and any data generated by that link layer device, is provided to the next adjacent down-stream link layer device. Data flow control is provided in an upstream direction from one link layer device to the next adjacent up-stream link layer device as a plurality of status indicators that correspond to the plurality of data channels. Each link layer device is responsive to the plurality of status indicators by not transmitting data on data channels having a corresponding status indicator indicative that no data is to be transmitted.

The invention discloses a measurement method and a device applied to a layered network. The method of the invention includes the following steps: after receiving the signaling carrying the indication information of the partial bandwidth sent by the base station, the user equipment, according to the indication of the partial bandwidth, The information is measured on the corresponding bandwidth of the used carrier; or, the user equipment determines a part of the bandwidth for measurement by itself, and performs the measurement on the part of the bandwidth of the used carrier. The invention can solve the problem of inaccurate wireless link monitoring caused by unbalanced interference on each sub-band in a layered network.

A boundary acoustic wave device includes a solid layer laminated onto a single crystal substrate, electrodes provided between the single crystal substrate and the solid layer, and boundary acoustic wave elements provided on the single crystal substrate having the same cut angle, wherein the propagation direction of one of the boundary acoustic wave elements is different from that of at least one of the other boundary acoustic wave elements. A compact and high-performance boundary acoustic wave device using a boundary acoustic wave is provided by increasing the steepness of a filter band and by forming filters or resonators with different fractional bandwidths on a single substrate.

A log-periodic antenna coupled to a channelizer is described in which matched scale constants for the antenna and the channelizer are used to achieve substantially identical coupling over each fractional bandwidth channel. Embodiments for simultaneous dual polarization operation are described as well as embodiments suited for planar lithographic fabrication.

A novel and useful system and method by which radar angle and range resolution are significantly improved without increasing complexity in critical hardware parts. A multi-pulse methodology is described in which each pulse contains partial angular and range information consisting of a portion of the total CPI bandwidth, termed multiband chirp. Each chirp has significantly reduced fractional bandwidth relative to monoband processing. Each chirp contains angular information that fills only a portion of the ‘virtual array’, while the full virtual array information is contained across the CPI. This is done using only a single transmission antenna per pulse, thus significantly simplifying MIMO hardware realization, referred to as antenna-multiplexing (AM). Techniques for generating the multiband chirps as well as receiving and generating improved fine range-Doppler data maps. A windowing technique deployed in the transmitter as opposed to the receiver is also disclosed.

A multi-stage Doherty power amplifier (“PA”) circuit which achieves superior efficiency over broadband range of frequencies is disclosed. Conventional multi-stage amplifiers may offer potential for efficiency enhancement but may suffer from cost penalties and severe bandwidth limitation in practice. Embodiments may employ a driver in the peaking arm which is biased in class C which may alleviate such limitations. The amplifier topology and associated circuitry described in embodiments may achieve high efficiency, smooth PA gain, and enhanced phase characteristics over a 15% fractional bandwidth with reduced costs.

The invention discloses a broadband filter adopting a one-cavity triple-mode cavity resonator. The broadband filter comprises a cavity, a first port, a second port and a perturbation metal body, wherein the perturbation metal body is arranged at the bottom of the cavity, the center of the perturbation metal body deviates from the center of the cavity, and the first port and the second port are arranged on the cavity and penetrate through the outer wall and the inner wall of the cavity. A first conductor assembly is arranged at the first port, a second conductor assembly is arranged at the second port, the axis of the first conductor assembly and the axis of the second conductor assembly are perpendicular to each other and perpendicular to the longitudinal center line of the cavity respectively. A degenerate mode is separated by the method of skewing of the resonator, and therefore, the broadband filter has the advantages of high selectiveness and Q value and simple design, has a wider fractional bandwidth, can meet requirements of miniaturization communication, is easy to manufacture without machining any chamfers or performing slotting, solves the problem of complexity of band wide and narrow machining of the existing cavity filter, and is simple in structure and wide in application range.

A novel and useful system and method by which radar angle and range resolution are significantly improved without increasing complexity in critical hardware parts. A multi-pulse methodology is described in which each pulse contains partial angular and range information consisting of a portion of the total CPI bandwidth, termed multiband chirp. Each chirp has significantly reduced fractional bandwidth relative to monoband processing. Each chirp contains angular information that fills only a portion of the ‘virtual array’, while the full virtual array information is contained across the CPI. This is done using only a single transmission antenna per pulse, thus significantly simplifying MIMO hardware realization, referred to as antenna-multiplexing (AM). Techniques for generating the multiband chirps as well as receiving and generating improved fine range-Doppler data maps. A windowing technique deployed in the transmitter as opposed to the receiver is also disclosed.

A small-sized, high-performance boundary acoustic wave device using boundary acoustic waves. The device is obtained by sharpening the filter bands and fabricating resonators and filters of bands with different specific bandwidths on a single substrate. In the boundary acoustic wave device (1), a solid layer (5) is formed on a single crystal substrate (4), and an electrode is provided between the single crystal substrate (4) and the solid layer (5). The device (1) comprises boundary acoustic wave elements (2, 3) formed using single crystal substrates (4) having the same cut angle. The propagation direction of the boundary acoustic wave element (2) is different from the propagation direction of the boundary acoustic wave element (3).

The invention discloses an information configuration method and device. The information configuration method comprises the steps of transmitting information carrying transmission parameters to a second communication node, wherein the transmission parameters are shared by M resources; or conventionalizing the transmission parameters shared by the M resources with the second communication node, wherein M is a natural number which is greater than 1, and the resources are one or more types of the following resources: measurement reference signal resources, reporting resources and reference signalresources. In addition, a time-frequency resource area is set, and resources falling in the same time-frequency area are enabled in a quasi co-location relation, so that the setting of a QCL relationbetween the resources is simplified. On the other hand, considering the transmission of a measurement reference signal of the fractional bandwidth in the NR (New Radio), the design of a measurement reference signal pattern can occupy resources occupied by other signals.

The invention discloses a wideband filter adopting a single-cavity five-mode cavity resonator. The wideband filter comprises a cavity, a first port, a second port, a first perturbation metal body, a second perturbation metal body and a third perturbation metal body. The first perturbation metal body, the second perturbation metal body and the third perturbation metal body are arranged at the bottom of the interior of the cavity. The center of the first perturbation metal body, the center of the second perturbation metal body and the center of the perturbation metal body deviate from the center of the cavity. The first perturbation metal body and the second perturbation metal body are mutually symmetrical with the longitudinal center line of the cavity serving as the center. The center of the third perturbation metal body is located on the symmetric line of the first perturbation metal body and the second perturbation metal body. The first port and the second port are formed in the cavity and penetrate through the outer wall and the inner wall of the cavity. The wideband filter has the advantages of being high in selectivity, high in Q-value and easy to design and process; besides, the wideband filter has large fractional bandwidth and can well meet the requirement for miniaturized communication.

The invention provides a magnetic sensor comprising: a support structure; and three mutually orthogonal layered magnetoelectric composite materials embedded on the support structure, each of the layered magnetoelectric composite materials being formed of a piezoelectric material layer, two magnetostrictive material layers, two self-biasing material layers and four adhesive material layers. The magnetic sensor of the invention has the advantages of low power consumption, small volume, high stability, small fractional bandwidth, vector type and good orthogonality.

An antenna element 1 is formed such that a plurality of turning parts 13, 15, 17 are formed by being turned back in zigzag in parallel to a ground conductor film 2 while extending perpendicularly thereto and the lengths of segments 12, 14, 16, 18 between the turning parts are shorter on a side of the ground conductor film 2 (a side of a feeding part 4) and increase gradually as the segments are away from the ground conductor film 2. The turning parts of the antenna element 1 are formed such that the antenna resonates at two or more frequency bands, and has a fractional bandwidth of 4% or more of its frequency in a first frequency band and a fractional bandwidth of 15% or more of its frequency in a second frequency band by adjusting the lengths L1, L2 and L3 of respective segments and the intervals d1, d2 and d3 between adjacent segments. Consequently, a wideband antenna is realized in two or more multi-frequency bands, for example 2.4 to 2.5 GHz and 5 to 6 GHz, by using a single folded antenna.

It is provided a method, comprising modulating a carrier signal based on a group of input bits comprising n input bits with n=1, 2, 3, . . . out of 2n possible groups of input bits, such that, for each of the 2n possible groups of input bits, a respective sequence of N symbols is generated, wherein N is predefined, each symbol has a same duration T, a bandwidth of the respective sequence of the N symbols is k / (N*T) with k being a real value and 0<k<N.

A phase rotator for a Cartesian feedback power amplifier in a transmitter final stage contains an integrated voltage controlled tunable resonant circuit accomplishing band-pass filtering at a center frequency selected by local oscillator (LO) coarse trim control signals. The voltage controlled tunable resonant circuit attenuates input signal harmonic levels at large fractional bandwidths for the downconverter in the feedback LO path without setting a large number of poles in the band-pass filter. The binary-weighted course trim value for controlling the gain of the LO sets a bank of voltage-variable capacitors (VVC) in the voltage controlled tunable resonant circuit to control the center frequency in each of two 2-pole band-pass filters, creating a composite 4-pole band-pass filter at the input of a poly-phase quadrature generation circuit in the feedback LO path.

We provide arrays of capacitive micromachined ultrasonic transducer (CMUT) elements having large fractional bandwidth and configured such that each array element operates both to transmit and to receive. Large fractional bandwidth is provided by venting the CMUT cavity, which provides an additional source of damping for the resonant CMUT.