146results about How to "Increase frequency bandwidth" patented technology

An optical communication system is provided which includes an optical signal transmitter which communicates high bandwidth, high power frequencies. The optical signal transmitter includes a high efficiency / high power optical source such as an optical magnetron or a phased array source of electromagnetic radiation, and a modulator element. The modulator element may be within a resonance cavity of the high efficiency / high power optical source (intra cavity) or external to the cavity (extra cavity). The modulator element serves to modulate output radiation of the high efficiency / high power optical source to produce a modulated high frequency optical signal which may be transmitted through the air. The optical signal transmitter is particularly useful in providing the last mile connection between cable service operators and end users.

A small antenna operating in multiple modes including three or more modes. There are provided an antenna that includes a ground conductor having a ground potential, a single feeding point whose one end is formed by a part of the ground conductor, and a plurality of transmission lines to which RF power supplied to the feeding point is input, the transmission lines each radiating electromagnetic waves of three frequencies of three modes into space. These transmission lines comprises a transmission line 41 that is connected to the feeding point at one end and to a branching point at the other end, a transmission line connected between branching points, and transmission lines connected to the branching points. The lengths of the respective transmission lines are set so that impedance matching is performed at the feeding point with respect to a plurality of frequencies. The antenna is formed from an integrated metal plate.

A capacitive membrane ultrasonic transducer system and method of operation is described. The transducers are operated in the collapsed mode. In this mode the membrane is first subjected to a voltage higher than the collapse voltage, therefore initially collapsing the membrane onto the substrate. Then, a bias voltage is applied having an amplitude between the collapse and snapback voltages. At this bias voltage, the center of the membrane still contacts the substrate. By applying driving AC voltage or voltage pulses harmonic membrane motion is obtained in a circular ring concentric to the center. In this regime, between collapse and snapback, the cMUT has a higher eletromechanical coupling efficiency than it has when it is operated in the conventional pre-collapse mode.

A wideband splitter includes a core amplifier for receiving a single pair of differential input signals and providing first and second pairs of differential output signals. The first pair of differential output signals and the second pair of differential outputs have substantially identical characteristics. A signal gain is implemented between the received single pair of differential input signals and the first and second pair of differential output signals. The signal gain is substantially constant across the frequency bandwidth of the core amplifier. A bandwidth peaking network is coupled to the core amplifier and includes (a) a first coil and a first resistor connected in series and (b) a second coil and a second resistor connected in series. The bandwidth peaking network is configured to increase the frequency bandwidth of the core amplifier.

A waveguide having a non-conductive material with a high permeability (μ, μr for relative permeability) and / or a high permittivity (∈, ∈r for relative permittivity) positioned within a housing. When compared to a hollow waveguide, the waveguide of this invention, reduces waveguide dimensions by∝1μr*ɛr.The waveguide of this invention further includes ridges which further reduce the size and increases the usable frequency bandwidth.

The invention discloses a design method for a radio frequency ultra-wide band high-efficiency power amplifier and a circuit. The design method includes the steps of a multi-frequency point transistor input and output impedance test, design of a maximum power transmission output impedance matching network, design of a wide band input multi-section impedance matching network, design of an input harmonic suppression network and an output harmonic suppression network and design of a transistor offset network. The transistor input and output impedance test technology achieves precise calculation of transistor input and output impedance. The maximum power transmission output impedance matching network achieves transistor impedance matching and maximum power transmission. The wide band input multi-section impedance matching network achieves wide band transistor input impedance matching. The design of the input harmonic suppression network and the output harmonic suppression network eliminates higher harmonic influences at the input end and the output end of a transistor, reduce losses and improve power additional efficiency of the amplifier. The design of the offset network provides working voltage of the transistor. The power amplifier can acquire higher frequency bandwidth, output power and power additional efficiency.

A radio communication method is provided for reducing the overhead of radio resources (transmission power, transmission time, frequency band) caused by the transmission of a control signal to a mobile station in a poor propagation environment and thus enabling an improvement of throughput of the entire system. A base station (101) and mobile stations (111 and 112) are connected to allow communication by way of radio links in which a control channel and data channel can be set on each of downlinks and uplinks. The base station (101) uses the control channel to transmit a control signal to the mobile stations (111 and 112). The mobile stations (111 and 112), based on the control signal received from the base station (101), use a data channel to transmit or receive data. The base station (101) alters the amount of information of the control signal in accordance with communication conditions of the propagation paths of the radio links formed with the mobile stations (111 and 112).

A low-profile antenna provides dual simultaneous operation. A first antenna has a circular polarization radiation pattern. A monopole antenna includes a hollow tube and is top-loaded by locating a disk on top of the hollow tube. A support structure positions the monopole antenna between the first antenna and a ground plane. The first antenna is a four arm spiral antenna. The four arm spiral antenna and monopole antenna are each fed by a cable with a first conductor and a second conductor. The radiation pattern of the four arm spiral antenna is maximum at forty-five degrees above the horizon and is null toward the horizon. The cable excites the monopole antenna with respect to the ground plane to transmit / receive vertical polarized signals. The radiation pattern of the monopole antenna is maximum towards the horizon. The first antenna and the monopole antenna operate simultaneously.

A silicon photodiode with symmetry layout and deep well bias in CMOS technology is provided. The silicon photodiode includes a substrate, a deep well, and a PN diode structure. The deep well is disposed on the substrate, where an extra bias is applied to the deep well. The region surrounded by the deep well forms the main body of the silicon photodiode. The PN diode structure is located in the region surrounded by the deep well, where the silicon photodiode has a symmetry layout. The deep well is adopted when fabricating the silicon photodiode, and the extra bias is applied to the deep well to eliminate the interference and effect of the substrate absorbing light, and further greatly improve speed and bandwidth. Furthermore, the silicon photodiode has a symmetry layout, so that uniform electric field distribution is achieved, and the interference of the substrate noise is also reduced.

A radio communication device including: a case; a circuit board mounted inside the case; an antenna apparatus that is arranged inside the case and is fed electricity from the circuit board; and one or a plurality of antenna improving elements that are each arranged inside the case and each have a line section with one end grounded at one point to a ground of the circuit board and with another end open, in which the antenna improving element is arranged near a central portion of the case along a longitudinal direction thereof, and the antenna apparatus is arranged near an end of the case along the longitudinal direction thereof.

A switching unit which switches the sub antenna, which is for performing diversity reception in cooperation with the main antenna for transmission and reception, from functioning as an antenna to functioning as a parasitic element, or from functioning as a parasitic element to functioning as an antenna, is provided; the main antenna and the sub antenna are provided to be spaced a predetermined distance apart so that multiple resonance can be generated by electromagnetic coupling, and the sub antenna is made to function as a parasitic element to generate multiple resonance, widening the frequency band width within which the main antenna can transmit and receive a radio wave.

The application relates to an antenna system and a mobile terminal. The antenna system comprises a conductive frame, a first slot, a second slot, a first feeding point, a first switch module and a second switch module, wherein the first slot and the second slot divides the conductive frame into a first conductive frame and a second conductive frame; the first feeding point is electrically connected to the first conductive frame so as to feed in an antenna signal; the first switch module is connected to the first conductive frame so as to regulate the frequency of each of the first band and thesecond band radiated by the first conductive frame; the second switch module is connected to the second conductive frame so as to regulate the frequency of the third band radiated by the second conductive frame. Therefore, the frequency free switching of multiple bands is realized by arranging two switch modules, thereby increasing the frequency bandwidth of the antenna radiation, and improving the antenna performance.

The invention relates to a microwave plasma exciter device which includes a waveguide (23) for concentrating the microwaves; and a plasma generator (110, 120) for forming a plasma, which are disposed in a microwave concentration zone.

The invention discloses a shared integral term PID dual-closed-loop controller for a PWM digital power supply. The dual-closed-loop controller comprises a dual-closed-loop PID control module, wherein the dual-closed-loop PID control module comprises an error module, a proportional term calculation module, a differential term calculation model, an integral term calculation module and an output module; the error module is used for measuring and calculating voltage error and current error in each sampling period, and transmitting the error to the proportional term calculation module, the differential term calculation model and the integral term calculation module separately; the proportional term calculation module is used for measuring and calculating the voltage loop proportional term and the current loop proportional term of the sampling period; the differential term calculation model is used for measuring and calculating the voltage loop differential term and the current loop differential term of the sampling period; the integral term calculation module is used for performing assignment on the shared integral term integral factor according to the size of the voltage loop proportional term and the current loop proportional term of the sampling period, and calculating the value of the shared integral term according to the integral factor; the adjustment amount of the measured and calculated voltage loop or current loop is output by the output module; and a DC / DC power supply is controlled through PWM. By virtue of the shared integral term PID dual-closed-loop controller, an overshoot phenomenon of the PWM digital switch power supply can be effectively avoided, and high dynamic characteristic and high frequency bandwidth are achieved.

The present invention relates to a transducer device having a planar array of electroacoustic cells, each including a piezoelectric bilayer unit. The transducer device achieves high transmission sensitivity across a broad bandwidth. The transducer device may be designed to have a broad or a focused directivity pattern, or may be multi-frequency, depending on the particular application and has a range of applications. For example, the transducer device may be used with an implanted passive ultrasonically excitable resonating sensor, to excite the sensor and / or to interrogate the sensor, for example in conjunction with Doppler-based analysis of the resonance frequency of the sensor, and / or to locate an implanted sensor. The invention also relates to a method of manufacturing the device.

A switching unit which switches the sub antenna, which is for performing diversity reception in cooperation with the main antenna for transmission and reception, from functioning as an antenna to functioning as a parasitic element, or from functioning as a parasitic element to functioning as an antenna, is provided; the main antenna and the sub antenna are provided to be spaced a predetermined distance apart so that multiple resonance can be generated by electromagnetic coupling, and the sub antenna is made to function as a parasitic element to generate multiple resonance, widening the frequency band width within which the main antenna can transmit and receive a radio wave.

The invention relates to a microwave plasma exciter device comprising: a waveguide containing means (23) for concentrating the microwaves; and means (110, 120) for forming a plasma, which are disposed in a microwave concentration zone.

An RFID tag that has a tag antenna and a tag LSI comprising: a power-supply element in which the tag LSI is mounted on a power-supply section; a plurality of patch antennas that function as tag antennas and sizes differs; and a high-frequency coupling section that couples the power-supply element with each of the patch antennas by high-frequency coupling.

The embodiment of the invention provides a high-power linear power amplifier, which comprises a signal conditioning circuit, which is used for processing an input signal and outputting the processed signal; a power amplification circuit, which is used for receiving the signal processed by the signal conditioning circuit, conducting power amplification processing on the signal processed by the signal conditioning circuit and outputting the amplified power signal; a microprocessor circuit, which is used for controlling the operation of the signal conditioning circuit and the power amplification circuit and setting the parameters of the signal conditioning circuit, wherein the power amplification circuit comprises a differential amplification circuit, which is used for amplifying the signal processed by the signal conditioning circuit; a buffer amplification circuit, which is used for again amplifying the signal output by the differential amplification circuit; and a parallel push-pull amplification circuit, which is used for conducting power amplification processing on the signal amplified by the buffer amplification circuit and outputting the amplified power signal. By using the power amplifier, higher frequency bandwidth and output power can be obtained.

A small broadband monopole antenna having a perpendicular ground plane with an electromagnetically coupled feed is provided. The small broadband monopole antenna may be realized as a small antenna having a size of 0.085λ0×0.085λ0×0.085λ0 by positioning a folded strip line under a shorted square disc. A resonance of the shorted square disc may be coupled to a resonance of the square folded strip line so as to form a wide bandwidth of about 36.6% of a central frequency of 2.313 GHz based on a VSWR≦2. Also, rectangular slits may be inserted into the perpendicular ground plane to improve a distortion of a radiation pattern that forms on the perpendicular ground plane so as to reduce a backward radiation by 3 dBi or more. The small broadband monopole antenna exhibits a forward radiation pattern similar to that of a general monopole antenna and has a gain of about 2.6 dBi within a bandwidth.

In a wireless communication system having a wireless base station, wireless terminal stations belonging to a first group which performs wireless communication while sharing different frequency channels, and wireless terminal stations belonging to a second group which performs wireless communication by using one frequency channel, a first communication period and a second communication period is alternately repeated. In this system, a wireless terminal station belonging to the first or the second group communicates with the wireless base station by using a first frequency channel in the first communication period. Direct communication between two wireless terminal stations belonging to the first group by using a second frequency channel without through the wireless base station is performed in the first communication period. Then, a wireless terminal station belonging to the first group communicates with the wireless base station by using both the first and the second frequency channels.

A small antenna operating in multiple modes including three or more modes. There are provided an antenna that includes a ground conductor having a ground potential, a single feeding point whose one end is formed by a part of the ground conductor, and a plurality of transmission lines to which RF power supplied to the feeding point is input, the transmission lines each radiating electromagnetic waves of three frequencies of three modes into space. These transmission lines comprises a transmission line 41 that is connected to the feeding point at one end and to a branching point at the other end, a transmission line connected between branching points, and transmission lines connected to the branching points. The lengths of the respective transmission lines are set so that impedance matching is performed at the feeding point with respect to a plurality of frequencies. The antenna is formed from an integrated metal plate.

The invention relates to a method for continuously measuring dynamic fluid consumption, particularly fuel consumption, employing a continuously operating flow sensor (7) with variable pressure loss, preferably a mass flow sensor, wherein the pressure is determined downstream of the flow sensor (7) and used to control fluid conveyance. In order to enable continuous, accurate and temporally highly resolved consumption measurement and the highly dynamic determination of the flow rate, while maintaining the simplest design possible, at at least one time also the pressure directly upstream of the flow sensor (7), the difference of the two pressure values, and from this difference a value for the flow rate of the fluid are determined.

The invention belongs to the technical field of antennas and provides an LTCC technology-based genome unit compact conformal array antenna. The invention mainly aims to solve the problem that the conventional circularly-polarized micro-strip patch array antennas fail to realize low profile, circular polarization, high gain and wide band at the same time. The antenna comprises a grounding metal layer, a lower layer dielectric substrate, a lower layer metal patch antenna, an upper dielectric substrate and an upper layer metal patch antenna, which are successively stacked from bottom to top; the lower layer metal patch antennal is formed from lower layer metal patch units in array arrangement; the upper layer metal patch antenna is formed from upper layer metal patch subarrays corresponding to the lower layer metal patch units; each upper layer metal patch subarray and the corresponding lower layer metal patch unit have coinciding centers and form a genome unit together. Under the limit of the same number of array numbers, the antenna is smaller in size, higher in gain, better in circular polarization performance and greater in frequency bandwidth, and is simple in structure and easy to process.

A planar inverted F antenna having a radiation patch having an asymmetric shape of linearly-tapered rectangle with a plurality of corrugated hollows is disclosed. The planar inverted F antenna having a radiation patch, includes: a first radiation patch for radiating a signal; a ground plate for grounding the first radiation patch; a feeding line for supplying an electric power to the first radiation patch; a short plate having one side coupled to the first radiation patch and other side coupled to the ground plate for shorting the first radiation patch, wherein the first radiation patch having an asymmetrical shape of linearly tapered rectangle and has one or more corrugated hollows.

An RFID tag that has a tag antenna and a tag LSI comprising: a power-supply element in which the tag LSI is mounted on a power-supply section; a plurality of patch antennas that function as tag antennas and sizes differs; and a high-frequency coupling section that couples the power-supply element with each of the patch antennas by high-frequency coupling.