72 results about "Transmission amplitude" patented technology

A disk drive is disclosed for connecting to a host, the host comprising loopback circuitry operable to loop a pattern received from the disk drive back to the disk drive. The disk drive comprises interface circuitry including a transmitter driver operable to transmit transmission signals at a transmission amplitude, and a receiver driver operable to receive reception signals. The transmitter driver is configured to transmit at an initial transmission amplitude, and a calibration pattern is transmitted to the host through the transmitter driver. The reception signals received by the receiver driver are monitored to detect a loopback pattern representing a loopback of the calibration pattern. The loopback pattern is processed to detect an error, and the transmission amplitude is adjusted in response to the error.

A region in a metallic panel that facilitates the transmission of radio frequency signals. The metallic panel may be included in a window such as the window of a vehicle or building. For example, the metallic panel may be used for heating or to reflect infrared radiation. An aperture is formed in the metallic panel to enable radio frequency signals to be transmitted through the metallic panel. The design of the aperture may be selected to enable the transmission of the desired frequency band. Furthermore, the aperture is designed such that there is a taper in the transmission amplitude and/or the phase to suppress lobing effects on the other side of the aperture. In an embodiment in which the metallic panel is used to conduct electric current, the aperture may be oriented such that the current may flow between the openings of the aperture. Accordingly, there may be uniform heating across the metallic panel without blocking the transmission of radio frequency signals in the desired frequency band.

An apparatus and method is disclosed that allows a participant in a conference call to receive conference call roster information at a telephone display unit, at a computer display or at both types of display. The conference call information is updated during the call and includes identification of the speaker during a conference call. The conference callers are connected together and identified either by standard caller identification or by other identification provided by the operator. The conference callers' identifications are then transmitted in two ways. First, a coded signal is sent over the telephone connection to a telephone display unit. Second, an information packet is transmitted over the Internet to a conference call participant's computer. A server computer monitors the conference call and the identification of parties involved is updated a parties are added or disconnected. The speaking party is identified in one two ways. First, during the call, the speaker's telephone line will have a higher transmission amplitude than the other telephone lines and the line with the highest transmission amplitude will be identified by the server computer. Second, voice identification data is gathered before the conference call and stored in the server computer for use in identifying the speaker.

The disclosure concerns a method of simulating the image projected by a mask during photolithography including determining by a processor (702), taking into account the thickness of a masking layer of a mask, a near-field transmission amplitude curve of light passing through the mask across at least one pattern boundary in the initial mask layout; calculating by the processor, for each of a plurality of zones, average values of the curve; and simulating by a simulator (708) the image projected by the initial mask layout during the photolithography based on the average values.

The invention provides a transmission type miniaturized 90-DEG phase shifter. The transmission type miniaturized 90-DEG phase shifter includes a main microstrip line and a choking structure, wherein the main microstrip line includes a dielectric layer board, a main microstrip transmission line and a metal backing plate, the main microstrip transmission line is connected with one side of the dielectric layer board, the metal backing plate is connected with the other side of the dielectric layer board, two PIN diodes are connected in parallel between the main microstrip transmission line and themetal backing plate, one end of the choking structure is connected with the main microstrip transmission line, the other end of the choking structure is connected with a positive pole of an externalDC stabilized power supply, and the metal backing plate is connected with a negative pole of the external DC stabilized power supply. The transmission type miniaturized 90-DEG phase shifter is advantaged in that output phase difference can be 90 DEG, a phase shift error is less than 5 DEG, transmission amplitude difference is small, the regulatory response time is short, energy consumption is low,power consumption is less than 1mW, the state switching speed can reach the ns level, the phase shifter can be combined with digital signal processing and phased array radar communication systems, etc., the phase shifter has a very high application value in the military and civilian fields, and the phase shifter is applied to the technical field of a phase shifter.

The invention discloses a broadband dual-polarized double-layer transmission array unit, and belongs to the field of antenna design. The broadband dual-polarized double-layer transmission array unit includes fylfot metal patches, metal through holes and a dielectric substrate. The sizes of the fylfot metal patches can be changed. The broadband dual-polarized double-layer transmission array unit has the metal through holes within a certain size range and does not have the metal through holes beyond the size range. The fylfot metal patches have a structure of central symmetry and the two same layers are respectively located on upper and lower surfaces of the dielectric substrate. The metal through holes are connected with the fylfot metal patches located on the upper and lower surfaces of the dielectric substrate. The distances from all the metal through holes to the structural centers of the fylfot metal patches are the same. When the sizes of the fylfot metal patches change, the distances between the line widths thereof and the metal through holes change in proportion. The invention provides the broadband dual-polarized double-layer transmission array unit which can achieve 360-degree phase shift coverage under the condition that the transmission amplitude is greater than -1dB, supports dual polarization, has a high transmittance within a relatively broadband range, and has only two metal patches and the single-layer dielectric substrate.

The invention provides an S parameter detection apparatus and method. The S parameter detection apparatus is applied to a vacuum micro-discharge test apparatus and comprises a signal separation apparatus, a vector network analyzer and a main controller, wherein the signal separation apparatus is configured to separately divide a coupling transmission signal, a coupling reflection signal and a coupling output signal into two circuits of signals; the vector network analyzer is configured to receive a coupling transmission signal, a coupling reflection signal and a coupling output signal outputted by the signal separation apparatus and outputs a reflection signal amplitude variable quantity, a reflection signal phase variable quantity, a transmission amplitude variable quantity and a transmission phase variable quantity by virtue of corresponding measurement modes; and the main controller is configured to calculate echo loss, standing waves and transmission loss according to an input power monitoring value, a reflection power monitoring value and an output power monitoring value.

The invention discloses a bone conduction sound production device and wearable equipment, wherein the bone conduction sound production device comprises an external packaging structure, the external packaging structure is internally provided with a hollow cavity, and the hollow cavity is internally provided with: a hollow elastic sheet; an exciter, which comprises an upper magnetic piece and a lower magnetic piece, wherein the upper magnetic piece and the lower magnetic piece are oppositely arranged in parallel in the Z-axis direction, and a gap exists between the upper magnetic piece and the lower magnetic piece to form an isolation area; a space low-frequency adjusting plate, which is arranged between the hollowed-out elastic piece and the exciter, wherein the space low-frequency adjusting plate is used for adjusting the framework stacking of the hollowed-out elastic piece and the exciter in the Z-axis direction and adjusting the gap of the isolation area; the hollowed-out elastic piece is matched with the space low-frequency adjusting plate to adjust the effective vibration area of the hollowed-out elastic piece so as to adjust the resonant frequency point of the device. The wearable equipment provided with the bone conduction sound production device can transmit low-frequency signals, wherein the transmission amplitude is moderate, the whole sound frequency band is balanced, the good acoustic effect is achieved, and the user experience and the product sound quality are remarkably improved.

A small ultrasound diagnostic device is provided at a low cost that enables the appropriate control by a single power supply unit so as to give a predetermined transmission power to a driving waveform different for each mode without excess or deficiency and without affecting properties of the driving waveform. The ultrasound diagnostic device includes: an ultrasound generation unit (1) that transmits ultrasound; a waveform generation unit (2) that generates a single pulse or a burst pulse whose duty factor is variable in units of a time that is a period corresponding to a frequency outside a frequency band of the ultrasound generation unit (1) so as to drive the ultrasound generation unit (1); and a single power supply unit (3) that determines an amplitude of a driving waveform generated by the waveform generation unit (2). Thereby, an acoustic power of the transmitted ultrasound can be controlled without making the transmission amplitude variable.

The invention discloses a transmission type metasurface for circular polarization beam forming. Each unit of the metasurface comprises two metal layers and a dielectric substrate. Each of the upper metal layer and the lower metal layer comprises a round hole and a metal patch structure positioned in the round hole; the metal patch structure comprises a first metal strip and a second metal strip which are vertically intersected, and the first metal strip is provided with first to fourth branches; the first metal strip and the first to fourth branches form a back-to-back symmetrical E-shaped metal patch structure with an outward opening; through adjusting the rotation angle of the upper layer symmetrical E-shaped metal patch structure and the rotation angle difference of the upper layer symmetrical E-shaped metal patch structure and the lower layer symmetrical E-shaped metal patch structure, independent regulation and control of the transmission amplitude and the transmission phase of the circularly polarized wave are realized. Based on the transmission metasurface combined with an array antenna theory, amplitude and phase distribution required by a preset performance index can be obtained through optimization, arbitrary beam forming of circularly polarized waves is further achieved, and the transmission type metasurface has the advantages of being ultrathin, small in size, high in efficiency and the like.

The invention provides a design method based on a non-uniform transmission broadband PB super surface. The method can be used for designing a broadband vortex light generator. The method comprises thefollowing steps: theoretically deriving that when the phase difference between the two linear polarizations meets the equation that |phi<x>-phi<y>|=pi and the transmission amplitude meets the equation that |T<x>|=|T<y>|=1, high-efficiency transmission of a PB unit can be realized, and establishing a broadband PB metasurface working equation which is shown in the description, wherein f is any frequency in a frequency range from f<1> to f<2>, and a transmission phase of a right-handed circularly polarized wave during excitation of a left-handed circularly polarized wave is represented, i.e.,a super surface has a consistent phase change rate. Compared with the prior art, the vortex light generator designed on the basis of the unit has the advantages of being large in bandwidth, high in circular polarization purity, high in efficiency and the like, and a new research thought is provided for development of the broadband vortex light generator.