122results about How to "Wide working frequency band" patented technology

The invention discloses a bulk acoustic resonator based on a mono-crystal piezoelectric film. The bulk acoustic resonator includes a substrate, an acoustic reflection layer formed on the substrate, and a piezoelectric sandwich structure covering the acoustic reflection layer. The piezoelectric sandwich structure includes a lower electrode, a mono-crystal piezoelectric film, and an upper electrode. A metal film is deposited on the surface of the lower electrode and on the acoustic reflection layer, and a patterned bonding fulcrum is formed through a lithography process, and therefore, the piezoelectric sandwich structure and the acoustic reflection layer are bonded at low temperature. The mono-crystal piezoelectric film is obtained through crystal ion slicing, and the thickness of the film can be controlled by controlling the energy of ion implantation and the ion dose. The bulk acoustic resonator prepared in the invention has an electromechanical coupling coefficient above 44% and a quality factor above 2500, and can play an important role in the modern communication system featuring high-bandwidth and large-capacity data transmission.

The invention provides an angle tracking system, which is characterized by comprising a control center, an antenna branch system, a feeder line branch system, an emission branch system, a receiving branch system, a servo branch system and a communication interface branch system. The angle tracking system can search, capture and track unmanned airplanes, precisely position the unmanned airplanes according to orientation information, elevation measurement information and information frame ranging information which are acquired by an angle tracking branch system, emit real-time remote control signals of a flying state of the unmanned airplane and a working state of airborne equipment, and receive real-time remote sensing signals of a flying parameter and detection information of the unmannedairplane and the working state of the airborne equipment; each working row channel is provided with a plurality of frequency points; and the working frequency band is wide, and the anti-interference performance is high.

The invention discloses a small-size beam controllable patch antenna based on a reconfigurable parasitic element, and the antenna comprises an E-shaped main radiation patch, a left parasitic patch anda right parasitic patch. Through employing a CSRR structure, the antenna reduces the electrical length of a parasitic patch, and facilitates the miniaturization of the parasitic patch. A PIN diode isadded to CSRR structure for providing different DC bias voltages, thereby enabling a single parasitic element to work at two states: a director and a reflector. The combination of different states ofthe left and right parasitic elements can enable the main lobe direction of a radiation beam of the antenna to be switched among 0 degree, -30 degree, and 30 degrees, thereby achieving the beam controllable performance of the antenna, and effectively enlarging the beam scanning range of the antenna. The antenna employs the coaxial feed E-shaped main radiation patch and introduces an air layer structure between two dielectric substrates, thereby effectively enlarging the work bandwidth of the antenna. The antenna is high in gain, is high in front-to-rear ratio, and is low in profile.

The invention discloses a frequency band expanding structure of a terminal antenna. The frequency band expanding structure comprises a metal rear cover, a metal middle frame and a metal coupling piece. The metal middle frame is arranged on the periphery of the metal rear cover. Two disconnected gaps are formed in the bottom of the metal middle frame. The part, located between the two disconnected gaps, of the metal middle frame serves as an antenna irradiation body. The antenna irradiation body is provided with a feeding point, a grounding point and a metal middle frame wire connected to the disconnected gaps. By means of the metal middle frame wire, the low-frequency-band bandwidth and the high-frequency-band bandwidth resonated by the antenna irradiation body can be adjusted; the metal coupling piece is arranged at the tail end of the antenna irradiation body and located at the target position around the grounding point and is connected with the metal irradiation body through a metal short connecting needle so that the low-frequency-band bandwidth or the high-frequency-band bandwidth can be expanded through the coupling between the metal coupling piece and the antenna irradiation body, wherein the metal coupling piece is parallel to the top of the metal rear cover.

The invention discloses a high-gain narrowband radio frequency receiver. The high-gain narrowband radio frequency receiver includes a radio frequency front-end amplification and filtering circuit, a frequency mixing circuit, a multistage numerical control gain amplification circuit, a first-stage intermediate frequency filter, an N-stage intermediate frequency filter, an ADC matching network and an ADC; the radio frequency front-end amplification and filtering circuit is used for amplifying and filtering radio signals and inputting the amplified and filtered radio signals to the frequency mixing circuit; the frequency mixing circuit is used for performing frequency conversion on the radio frequency signals to obtain intermediate-frequency signals and outputting the intermediate-frequency signals to the first-stage intermediate frequency filter; the first-stage intermediate frequency filter is used for filtering the signals and sending the filtered signals to the multistage numerical control gain amplification circuit; the multistage numerical control gain amplification circuit is used for amplifying the signals and sending the amplified signals to the N-stage intermediate frequency filter; the N-stage intermediate frequency filter is used for filtering the signals and sending the filtered signals to the ADC matching network; and the ADC is used for converting signals outputted by the ADC matching network into digital signals. With the high-gain narrowband radio frequency receiver of the invention adopted, under a condition that blocking signals exist, a high-gain link can maintain unsaturated, sensitivity will not be deteriorated, and gain can be as high as 80db.

The invention provides a vivaldi antenna and a dual-polarized probe, which solves the problems of poor high-frequency cross-polarized levels and low port coupling isolation of existing probe antennas.The technical points are that the vivaldi antenna comprises three metal layers and dielectric plates arranged between each two adjacent metal layer; the intermediate metal layer is provided with a feeding structure, and the other two metal layers are provided with vivaldi antenna radiation structures electrically connected to the feeding structure; and the two vivaldi antenna radiation structuresare symmetric along the center line of the antenna to realize the double-grooved vitaldi structure, which effectively improves low-end standing waves, so that the antenna has a good high-frequency cross-polarization level and has a relatively high isolation degree. Meanwhile, by arranging a clamping groove in the center line position of each antenna, the orthogonal connection of two vivodi antennas can be realized by using the clamping grooves to form a dual-polarized probe, and the vivaldi structures are respectively arranged on the two sides of each clamping groove to avoid destroying the circular back cavities of the vitaldi structures. The phase centers of the two antennas of the probe can be aligned without destroying the circular slit back cavities of the vitaldi structures.

The invention relates to the field of an underwater sound metering test, which is mainly a hydrophone phase low-frequency calibration tube comprising a metal rigid tube body; the metal rigid tube bodyis internally provided with a calibration tube cavity and an energy converter cavity which are communicated; the calibration tube cavity is used for containing liquid medium and forming a liquid column, and the thickness of the tube wall of the metal rigid tube body is larger than or equal to the radius of the calibration tube cavity; a supporting step of the bottom part of the calibration tube cavity is provided with a soft rubber vibrating membrane, a vibrating piston is connected below the soft rubber vibrating membrane, a vibrating coil is bonded and fixed at the back surface of the vibrating piston by epoxy resin, and the center line of the soft rubber vibrating membrane, the center line of the vibrating piston and the center line of the vibrating coil are completely coincided with the center line of the metal rigid tube body; and the energy converter cavity is internally provided with a piston-type electrodynamic energy converter. The invention has the beneficial effects of: being applicable to measurement and calibration of the small-size hydrophone low-frequency acoustic characteristic, being characterized by low frequency, wide band, oil resistance, water-leakage prevention and corrosion resistance and the like and having good time stability and temperature stability.

The invention provides a radiation structure and an array antenna. The radiation structure comprises a radiation fin with a radiation slot in the middle. The radiation slot consists of a transverse slot and a longitudinal slot, which are communicated with each other and are cross-orthogonal. The length of the transverse slot and the length of the longitudinal slot are less than the length of the radiation fin in the extending direction of the corresponding radiation slot. By adding the radiation slot to the radiation fin, the radiation structure can produce two kinds of radiation synchronouslywhen working in an antenna system, so as to achieve an effect of polarization vector superposition enhancement. Thus, the same radiation efficiency and radiation gain of the multi-layer patch structure in the traditional antenna can be achieved by only one layer of radiation fin, fewer components are used, the structure is simple, the antenna profile can be reduced, and antenna miniaturization isfacilitated.

The invention discloses a testing system and method for phase consistency among frequency variable T/R assembly channels and belongs to the technical field of testing. According to the system and the method, reference channels and calibration channels work in a passive state, do not consume power, do not generate heat, do not generate temperature drift and are high in testing accuracy; according to the reference channels and the calibration channels established by introducing double-balanced mixers and lowpass filters, so full-double two-port calibration is possible and the testing accuracy is improved; power supply, state control and transmitting signal regulating devices do not need to be arranged for the reference channels, so system components are simplified, and system construction costs are reduced; the working bands of the double-balanced mixers are relatively wide; frequency unchangeable and one-time frequency variable reference channels and calibration channels are established through switching of switches, so certain university is achieved; and the lowpass filters are introduced into the input and output ports of the reference channels and the calibration channels, so unnecessary spectrum components are filtered, and the accuracy of a testing result is improved.

The invention discloses a low-noise amplifier structure. The low-noise amplifier structure comprises a bandgap reference circuit (Bandgap), a digitally-controlled gain circuit (DCG), a signal amplification circuit (Amplifier) and a notch filter circuit (IRnotchfilter) with an adjustable image rejection frequency. An operating frequency signal Vop is amplified through antenna reception, an image signal Vim under image frequency is rejected, and an effective signal is further amplified by a capacitance and inductance resonant circuit (LCtank) to obtain an image rejection (IR) gain response from the reception to the output; through a digital control part, an input quiescent point is controlled so as to maximize the gain of an operating frequency point. The image signal is rejected, namely the gain of the image frequency im is reduced through a notch filter network, a load resonant frequency is higher than the image frequency so to enhance the rejection performance on an image frequency output signal and improve the performance of low-noise amplifier, and thus the overall performance of a superheterodyne radio frequency receiver designed in the future is improved.

The invention relates to a terahertz quasi-optical power combining and amplifying device and is applied to power combination and amplification of a terahertz frequency band. The device comprises a microwave transmission horn antenna, a dielectric lens A, a microwave amplification array chip, a terahertz frequency-doubling array chip, a dielectric lens B and a terahertz horn reception antenna. According to the focusing effect of the dielectric lens A, spherical electromagnetic wave signals input by the microwave transmission horn antenna are converted into plane wave signals which are transmitted to the microwave amplification array chip to realize amplification and output. Amplified microwave signals are transmitted to the terahertz frequency-doubling array chip to realize frequency doubling and output. The frequency-doubling terahertz signals combine into high-power signals through the dielectric lens B in the form of quasi-optical wave beams, thereby realizing coupling and matching with the terahertz horn reception antenna. The high-power terahertz signals can be outputted by adopting a quasi-optical power combining structure, thus the terahertz quasi-optical power combining and amplifying device is simple in structure and convenient to debug.

The invention discloses an L-waveband broadband dual-polarization short-backfire dipole antenna which is composed of four radiators, two coaxial feed lines, two metal Balun support columns, two horizontal problems an improved hexagonal reflection back cavity, a fixed disck and a hexagonal matching disk. The invention uses the improved hexagonal reflection back cavity to reduce mutual coupling among units, improve the bandwidth and enhance the axial gain. The antenna is characterized in that radiation directional diagram are symmetrical rotationally, the cross polarization level is low, the reflection loss is low and the like; and can serve as a composition unit in the front end of a receiver of an antenna phased array feed source of an L-waveband radio astronomy telescope, as well as a phased array feed source for a communication, measurement and control and reflection plane monitoring antenna.

The invention discloses a broadband channelized transceiver which comprises a radio frequency transceiver module, a channel frequency conversion module, an intermediate frequency transceiver module and a control module.The device utilizes the radio frequency transceiver module, the channel frequency conversion module, the intermediate frequency transceiver module and the control module which are sequentially connected.When receiving the signal, the radio frequency signal received by the radio frequency transceiver module is divided into radio frequency signals of different working frequency bands by the channel frequency conversion module and is mixed and sentto the intermediate frequency transceiver module;and an effective intermediate frequency geophone channel is judged by a control module according to a detection signal sent by a plurality of intermediate frequency geophones and a preset threshold value, at the same time, corresponding control signals are generated for SPMT IF switches. The IF transceiver module controls the opening and closing of SPMT IF switch according to the control signal of the control module to realize the signal input or output of the corresponding IF power divider, and realizes the signal transceiver mode of wideband RF input, narrowband IF output, narrowband IF input and wideband RF output.

The invention discloses a terminal antenna frequency band extension structure comprising a metal rear cover and a metal middle frame. The metal middle frame is arranged around the metal rear cover. The bottom part of the metal middle frame is provided with two broken seams. The metal middle frame arranged between the two broken seams acts as an antenna radiator. The antenna radiator is provided with a feed point, a grounding point and a metal middle frame wire which is connected with the broken seams. The low frequency band bandwidth and the high frequency band bandwidth generated by the antenna radiator through resonance can be adjusted through the metal middle frame wire. The terminal antenna frequency band extension structure also comprises a metal coupling sheet which is arranged at the tail end of the antenna radiator and positioned at the target position around the grounding point. The metal coupling sheet is connected with the metal radiator through a metal shorting pin so as to extend the low frequency band bandwidth or the high frequency band bandwidth through coupling between the metal coupling sheet and the antenna radiator, wherein the metal coupling sheet is parallel to the bottom part of the metal rear cover.

The invention relates to the technical field of integrated circuit design and manufacture, in particular to a single chip power amplifier which is widely used for various kinds of active radar components of W wave band millimeter waves and communication systems. An input match circuit is integrated on a single chip, the input end of the input match circuit is connected with an external signal input source, the output end of the input match source is sequentially connected with a four-level transistor amplifier, an output match circuit and a power synthesis circuit in series and then outputs outside, wherein the four-level transistor amplifier comprises a first level transistor amplifier, a second level transistor amplifier, a third level transistor amplifier, and a fourth level transistor amplifier. The single chip power amplifier can be widely used for the fields of various kinds of active radar components of W wave band and millimeter wave communication systems. The single chip power amplifier has the advantages of being wide in working frequency range, stable in full frequency range property, and capable of effectively decreasing an area of a chip and loss, and achieving high power output of the chip.

The invention discloses an electromagnetic-wave absorbing material with the interstitial modulation characteristics and a production method of the electromagnetic-wave absorbing material. The general formula of the electromagnetic-wave absorbing material is R<2>Fe<17>N<x>C<y>, wherein the R refers to combination of any one or multiple rare earth elements of Y, Ce, Nd, Pr, Sm, Gd, Tb, Dy, Ho, Er, Tm and Lu, the x and the y respectively refer to nitrogen and carbon content entering the lattice gap position, 0</=<x>+<y></=9, and the x and the y are not equal to 0 at the same time; the electromagnetic-wave absorbing material is an R<2>Fe<17>-type master alloy billet formed by mixing and melting the rare earth element R and an iron element and is obtained by subjecting the master alloy billet coarse crushing prior to being introduced into clearance carbon atoms and/or nitrogen atoms to have magnetism of a master alloy crystal modulated. The electromagnetic-wave absorbing material has high absorbing capability on high-frequency electromagnetic waves ranging from 1GHz to 100GHz in smaller matching thickness, and the characteristics of accurate operation frequency modulation can be realized by the production method and according to different use conditions.

The invention discloses a terminal antenna frequency band extension structure comprising a metal rear cover and a metal middle frame. The metal middle frame is arranged around the metal rear cover, and the metal rear cover and the metal middle frame form an integrated structure. The two ends of the integrated structure are provided with seams. The integrated structure is separated into two antenna radiators and a back metal plate by the seams. The two antenna radiators are respectively provided with a first grounding point, a feed point and a second grounding point. The antenna radiators are enabled to generate low frequency band bandwidth and high frequency band bandwidth through resonance by controlling disconnection and connection of the two first grounding points. The terminal antenna frequency band extension structure also comprises metal coupling sheets which are arranged at the target positions around the feed points so as to extend the low frequency band bandwidth or the high frequency band bandwidth through coupling between the metal coupling sheets and the antenna radiators, wherein the metal coupling sheets are parallel to the top part or the bottom part of the metal rear cover.

The invention belongs to the technical field of testing, and relates to an impedance adjuster used for multi-parameter measurement of a microwave network under a microwave large signal state. The whole machine of the impedance adjuster consists of a microwave main body, a control unit, a display unit, a key, a drive unit, a photoelectric detection feedback unit, an external control computer, a standard external control interface and a precision The mechanical transmission part is composed. According to the principle of adjusting impedance in parallel, the impedance adjuster is connected in parallel to the flat coaxial transmission line through the admittance slider. The automatic control based on the high-performance microprocessor cooperates with the precision stepping motor and the precision mechanical transmission device, which can accurately realize the The displacement control of the admittance slider completes precise and small controlled displacement in the horizontal and vertical directions, and realizes precise impedance adjustment with a maximum reflection coefficient modulus of 0.875 and a repeatability better than 40dB.

The invention discloses a terminal antenna frequency band expansion structure, which comprises a metal back cover, a metal middle frame and a metal coupling piece. The metal back cover is peripherally provided with the metal middle frame. The metal back cover is separated with the top portion or the bottom portion of the metal middle frame through a gap to enable the top portion or the bottom portion of the metal middle frame to serve as an antenna radiation body, wherein the antenna radiation body is connected with a grounding point at a first position, is connected with a feeding point through an adjustable capacitor at a second position and is connected with a tuning circuit through a multipath tuning switch at a third position; and the metal coupling piece is arranged at the place of a target position around the feeding point to expand bandwidth of the antenna radiation body through coupling between the metal coupling piece and the antenna radiation body.

The invention discloses a channel loaded bow-tie electromagnetic band gap antenna which comprises an electromagnetic band gap structure. The antenna is characterized in that: the bow-tie antenna is supported by a supporting layer and is arranged on the electromagnetic band gap structure; one end of a Balun is connected with the bow-tie antenna to feed current to the bow-tie antenna by passing through a through hole arranged in the center of a substrate of the electromagnetic band gap structure, and the other end is connected with an SMA. In the antenna, capacitive load and inductive load can realize self-balance in broad frequency band, and the impedance and the radiation mode in the antenna are stable, thus expanding the impedance bandwidth of the antenna; and the antenna gain is not affected while expanding the operation bandwidth of the antenna; the distance between the antenna and the electromagnetic band gap structure can be rather less than a quarter wavelength, and broad operating frequency range and good gain can be acquired.