728results about How to "Small insertion loss" patented technology

The invention provides a signal receiving and transmitting device and terminal equipment. The signal receiving and transmitting device comprises a first communication module and a second communicationmodule, a first switch is respectively connected with the first end of the first communication module and the first end of the second communication module; a second switch is connected with the second end of the first communication module; a first antenna structure is connected with the second switch; a third switch is connected with the second end of the second communication module; a second antenna structure is connected with the third switch; Wherein the first communication module corresponds to a first transmitting link and two receiving links, and the second communication module corresponds to a second transmitting link and two receiving links; At least one of the first transmitting link and the second transmitting link is conducted during signal transmitting, and two receiving linkscorresponding to the first communication module and the second communication module are conducted during signal receiving. According to the invention, the insertion loss of a receiving link can be reduced, the performance of a transmitting link is improved, the routing length is reduced, and the compatibility of 1T4R and 2T4R modes is realized.

The invention discloses a full-duplex active phased filter antenna array surface, and aims at providing an antenna array surface with high-isolation array transmitting and receiving and good filter characteristic. A transmitting antenna array surface of a transmitting array antenna and a receiving antenna array surface of a receiving array antenna consist of a plurality of arrayed radiation units;a multi-layer printed board integrally integrating a radiation circuit, a feed switching circuit and a filter circuit achieves connection between different circuits by vertical interconnection structures of metallized via holes; a metal upper cavity body of a transmitting-receiving component serves as a metal ground; a metal upper cavity body base of a metal floor is consubstantially connected byradio-frequency fuzz button connectors; and then a radiation unit and transmitting-receiving component integrated box-type submatrix module filter antenna unit is formed. With the adoption of the full-duplex active phased filter antenna array surface, high-isolation array transmitting and receiving can be achieved; insertion losses of array transmitting and receiving can be reduced; and high-precision amplitude and phase control can be achieved.

The invention relates to a high/intermediate-frequency front-end circuit of a digital short-wave receiver, which mainly comprises a PIN diode electric control attenuator, digital control electric tuning preselected tracking filter groups, a gain control low-noise amplifier, a direct digital frequency synthesizer, a plurality of frequency mixers, an intermediate-frequency amplifier, an amplitude detection and grain control circuit and a preselected controller, wherein a weak signal sensed by an antenna is subjected to tracking frequency selection by the first digital control electric tuning preselected tracking filter group after passing through the PIN diode electric control attenuator and then is subjected to frequency selection by the second digital control electric tuning preselected tracking filter group after being amplified by the gain control low-noise amplifier, the signal after being subjected to frequency selection is subjected to frequency mixing three times with the plurality of frequency mixers by three local oscillators formed by the frequency synthesizer and is transmitted to a demodulator for demodulation after being subjected to multistep intermediate-frequency amplification and gain control processing. The high/intermediate-frequency front-end circuit of the digital short-wave receiver can meet the requirement of high sensitivity, strong anti-interference performance and wide dynamic range for the short-wave receiver, is suitable for a frequency-hopping receiving machine with rapid frequency change and has the effects of low insertion loss, low in-band ripple and high selectivity.

The invention discloses a low-pass and high-absorption electromagnetic functional layer, which comprises a low-pass and high-resistance frequency selection surface and a wave absorption unit array, wherein the low-pass and high-resistance frequency selection surface comprises metal structure unit arrays which are etched on two surfaces of a dielectric substrate and are different in structure size; the periods p of the unit arrays are 10.0mm to 20.0mm; metal structure units have rotation symmetry; the frequency selection characteristics of the metal structure units are irrelevant to the polarized direction of an incident wave; the metal structure units on two surfaces are different in size; the wave absorption unit array is a periodic array which comprises square or round sheets which are fabricated by magnetic loss radar wave-absorbing materials or resistance type wave-absorbing materials; the wave absorption unit array has broadband wave absorption performance on a high-frequency band; the sizes of wave absorption units are smaller than those of the metal structure units; and each wave absorption unit is adhered to one side of each metal structure unit with a relatively small size of the low-pass and high-resistance frequency selection surface. The obtained material is small in insertion loss, small in thickness, flexible in design and low in cost.

A BOSA (Bi-Di Optical Subassembly) optical structure used for a high-speed receiving and transmitting system comprises a shell; the shell is internally provided with a transmitting-end TOSA optical structure and a receiving-end ROSA optical structure; the transmitting-end TOSA optical structure comprises a wavelength division multiplexing device (MUX), an isolator and a receiving collimator; and the receiving-end ROSA optical structure comprises a wavelength division demultiplexing device (DEMUX) and a second collimator. The BOSA (Bi-Di Optical Subassembly) optical structure used for the high-speed receiving and transmitting system is characterized in that the shell is internally provided with a baffle; the baffle separates the transmitting-end TOSA optical structure and the receiving-end ROSA optical structure; the transmitting-end TOSA optical structure also comprises a first rhombic prism bending a beam emergent from the isolator to the receiving collimator; and the receiving-end ROSA optical structure also comprises a second rhombic prism bending a beam emergent from the second collimator to the wavelength division demultiplexing device. by adopting the micro optical structure design, beam insert loss can be greatly reduced, the coupling efficiency is improved, power consumption is reduced, and long-distance transmission of optical signals is facilitated.

The invention discloses a wireless surface acoustic wave temperature measurement system reader-writer, which consists of a signal generating unit 101, an amplifier unit 102, a band-pass filter 103, a radio frequency switch 104, a crystal oscillator 105, a local oscillator 106, a band-pass filter 107, a low noise amplifier 108, a filter 109, an intermediate frequency amplifier 110, an analog-digital conversion module 111 and a digital signal processing module 112. The reader-writer has a double phase-locked loop structure, ensures that the expected frequency can be achieved during transmission and receiving, and provides guarantee for accurately measuring temperature.

The invention discloses a distributed miniature band-pass balance filter which comprises a surface mounted 50-ohmage resistance input port, four parallel resonance units, two surface mounted 75-ohmage resistance output ports and a grounded terminal. The input port is connected with the first-stage parallel resonance unit. The two output ports are connected with two strip lines of the fourth-stage parallel resonance unit respectively. The strip lines of the first-stage parallel resonance unit, the second-stage parallel resonance unit, the third-stage parallel resonance unit and the fourth-stage parallel resonance unit are respectively grounded at one end and provided with an open circuit at the other end. Two ends of two Z-shaped interstage coupling strip lines are both grounded. The distributed miniature band-pass balance filter has the advantages of being small in size, light in weight, high in reliability, excellent in electrical performance, simple in circuit implementation structure, low in cost and convenient to use and install.

The invention discloses a phase shifting feed network. The phase shifting feed network comprises a plurality of phase shifters, a plurality of power dividing units and a drive unit, wherein each phase shifter comprises a suspended strip-shaped line structure composed of a conductor shielding cover, a second medium board and a U-shaped coupling line thereon, a parallel coupling line and a first medium board with the same, and a metal ground in a successive stacking mode. The first medium boards of the phase shifters are connected to form a connected medium board; the connected medium board is provided with the power dividing units; the phase shifters are symmetrically arrayed in two rows, and the parallel coupling lines of the adjacent phase shifters in the same row are connected through the power dividing units; the drive unit is connected with the second medium board of each phase shifter to synchronously drive several medium boards to move so as to enable the U-shaped coupling lines to move relative to the parallel coupling lines to realize the signal phase shifting. The phase shifting feed network is a hybrid phase shifting feed network which comprises the suspended strip-shaped line and a micro-strip line, and the hybrid phase shifting feed network is capable of realizing the phase shifting of a tunable antenna in higher integration level, better expansibility and more excellent performance.

The invention discloses a low-profile one-dimensional active transceiving phased-array antenna for satellite communication in motion. The antenna comprises dual-linear-polarization antenna units in inclined and staggered arrangement, flat waveguide dual-channel feed networks, flat waveguide dual-channel miniaturized duplexers, waveguide transition and miniaturized TR components and miniaturized printed board power division networks. The units of the phased-array antenna are dual-linear-polarization waveguide radiators in triangularly inclined and rear-staggered arrangement, so that the antenna is low. By the aid of a method of sharing the same aperture for horizontal polarization and vertical polarization, aperture utilization efficiency of the antenna is increased, a flat waveguide feedback mode is adopted for both horizontal polarization and vertical polarization, loss of the feed networks is reduced, and quite high antenna efficiency is achieved. After passing through the antenna units, the feed networks and the duplexers, dual-polarization signals are subjected to polarization adjustment via polarization adjustment modules in the TR components and are synthesized via pitching surface networks so as to achieve a transceiving function of radio-frequency signals.

The invention relates to an SIC technology-based four-element dual-polarization microstrip antenna array, which comprises six layers of printed circuit boards and metal supports (6), wherein the lowersurface of a top layer of printed circuit board (17) is printed with rectangular parasitic patches (1); the upper surface of a third layer of printed circuit board (16) is printed with rectangular main patches (2) and a main patch layer reflection plate (11); the upper surface of a fourth layer of printed circuit board (15) is printed with a vertical-polarization feeder line (3) and a ring (8); the upper surface of a fifth layer of printed circuit board (14) is printed with a grounding plate (4); cross gaps (9), circular openings (19) and circular openings (20) are etched on the grounding plate (4); a horizontal-polarization feeder line (5) and a strip line (10) are printed on the lower surface of the fifth layer of printed circuit board (14); and the lower surface of the bottom layer ofprinted circuit board (12) is provided with an antenna bottom reflection plate (13). The SIC technology-based four-element dual-polarization microstrip antenna array has the advantages of wider bandwidth, higher port isolation and lower cross polarization level.

The invention belongs to the field of radar antenna control, and provides a single-pole double-throw switch for radio frequency transceiving switching. The switch comprises two microstrip lines and aswitch tube core, wherein one end of a first microstrip line is connected with an antenna, and the other end of the first microstrip line is connected with a PA output matching end; one end of a second microstrip line is connected with the antenna, and the other end of the microstrip line is connected with both an LNA input matching end and a drain of the switch tube core Q4; and a source of the switch tube core Q4 is grounded, an inductor L is connected between the drain and the source in parallel, and a gate is a control end. Compared with the traditional single-pole double-throw switch in which two switch tube cores are connected in parallel and grounded and connection statuses of the two switch tube cores are different, the switch provided by the invention has the advantages that the number of switch transceiving control voltages is reduced, and an original control switch in a transmitting circuit and a 1/4 wavelength microstrip line connected with the control switch are removed, so that a switch path is simplified, a transmission route for transmitted signals is shortened, the size is reduced, the problem of transmitting power back-off is effectively avoided, and insertion loss of a transmitting output end is further reduced.

The invention relates to a hybrid lumped distribution miniature band-pass filter. The hybrid lumped distribution miniature band-pass filter comprises a 50-ohmage input-output port installed on the surface, four parallel-connection resonance units, two interstage coupling inductors, a interstage coupling capacitor, a Z-shaped cross coupling capacitor and an input/output inductor which are all achieved through the multilayer low-temperature co-fired ceramic technical skill. The hybrid lumped distribution miniature band-pass filter has the advantages of being good in band-pass selectivity and out of band rejection, low in insertion loss, light in weight, small in volume, high in reliability, good in electric performance, phase-frequency characteristic linearity, temperature stability and electric performance batch uniformity, low in cost, capable of being produced massively and the like, and is especially applicable to radars, communication, rocket carrying, plane carrying, missile carrying, spacecrafts, man-portable mobile communication terminals and other wireless communication handheld and portable terminal products and corresponding frequency range systems with strict requirements for volume, weight, electric performance, reliability and the like.

The present invention discloses a filter based on axial direction apodized grating. Input single mode waveguide is connected with the upper end port of the left end of an asymmetrical gradual changing directional coupler through input gradual changing waveguide, and the lower end port of the left end of the asymmetrical gradual changing directional coupler is connected with bending waveguide to realize reflection signal download; and the upper end port of the right end of the asymmetrical gradual changing directional coupler is connected with the left end of an antisymmetrical multimode waveguide grating, and the right end of the antisymmetrical multimode waveguide grating is connected with the output single mode waveguide through output gradual changing waveguide. The separation of grating reflection signals employs the asymmetrical gradual changing directional coupler with large tolerance and small insertion loss to realize download of the grating signals; based on a grating filter, the filter based on axial direction apodized grating is large in tolerance and wide in bandwidth regulation range and cannot be limited by the FSR so as to realize filters with various different bandwidth demands; and moreover, the axial direction position regulation of grating teeth realizes apodization so as to realize a grating filter with large sideband suppression ratio and greatly improve the performance of the grating filter.

The invention discloses a broadband dual-polarization base station filter antenna unit without an external filter circuit and an array thereof. The antenna unit is arranged in the middle of the reflector. The antenna comprises an oscillator arm, a balun and two parasitic metal rings. The vibrator arm is provided with a microstrip line branch, is connected through the balun, and is fed through thebalun, and the balun is provided with a feeder line. The upper part and the lower part of the vibrator arm are respectively provided with parasitic metal rings. The antenna unit has the characteristics of compact and simple structure. The invention realizes good out-of-band rejection effect and has good frequency selectivity without cascading filter, thus avoiding filter insertion loss. The invention realizes high polarization isolation, and realizes stable pattern in wide frequency band at the same time.

The invention provides a gallium arsenide dual-mode band-pass filter and a manufacturing method of the gallium arsenide dual-mode band-pass filter. According to the filter, the requirement for a miniaturized millimeter-wave circuit is met, the insertion loss is small, and the selectivity is high. According to the technical scheme, a loading branch and a lambda/2 resonator constitute a bent branch line loading type dual-mode resonator of an annular structure; microwave signals fed through an input micro-strip are transmitted to an output micro-strip through two physical channels of the filter, so that frequency selection of a pass band is achieved, wherein according to one channel, the signals are transmitted through an input coupling branch and an output coupling branch, an extra out-of-band transmission zero is provided, and the position of the zero is adjusted through the lengths and the coupling distances of the input coupling branch and the output coupling branch, and according to the other channel, the microwave signals are coupled to the dual-mode resonator through an incoming feeder and then are coupled to the output micro-strip through the dual-mode resonator, two transmission pole pass bands and two transmission zero stop bands are formed by the dual-mode resonator, and one of the transmission pole pass bands and one of the transmission zero stop bands are provided by a dual module of the dual-mode resonator.

The invention discloses a miniature LTCC 1.8-GHz power divider with a built-in resistor. The miniature LTCC 1.8-GHz power divider with the built-in resistor comprises a surface-mounted 50-ohm impedance input port, an input inductor, a first spiral inductor, a second spiral inductor, a ground capacitor, a shunt capacitor, two vertical ports, two first parallel ports, two second parallel ports, the built-in tantalum absorption resistor, a first output inductor, a second output inductor, a first surface-mounted 50-ohm impedance output port, a second surface-mounted 50-ohm impedance output port and a ground plate. The miniature LTCC 1.8-GHz power divider is made of LTCC materials in a three-dimensional integrated mode and has the advantages that use is easy and convenient, the size is small, the isolation degree is high, the insertion loss is low, the phase difference between the two output ports is small, the reliability is high, the electrical performance and the temperature stability are good, the cost is low, and mass production can be achieved.

The invention discloses a polarization-independent phase encoding quantum key distribution system and method. A sending end comprises a pulse laser, an intensity modulator, an optical fiber isolator,a phase encoding unit and an electrically adjustable attenuator which are connected in sequence. A receiving end comprises an optical fiber circulator, a phase decoding unit, a first single photon detector and a second single photon detector. The phase decoding unit is composed of an unequal-arm Mch (Zehnder) interferometer and a Sagnac ring. Compared with the prior art, polarization changes of along arm and a short arm of an MZ interferometer can be automatically compensated, and polarization consistency of two paths of pulses passing through the long arm and the short arm is ensured so thatchannel polarization disturbance resistance is realized. The requirement on the voltage amplitude of the phase modulator is low. Due to the introduction of the Sagnac ring, two polarization components of one optical pulse respectively pass through the phase modulator from opposite directions, equivalently, the whole optical pulse is only subjected to phase modulation once, so that insertion lossis small, working rate of the system is not limited by the structure and can reach more than GHz, and key productivity is greatly improved.

The embodiment of the invention provides a radio frequency circuit switch chip, a radio frequency circuit, an antenna apparatus and an electronic device. In the radio frequency circuit switch chip, an input end of a first switch comprises a high frequency port, the input end of a second switch comprises a medium frequency port and the input end of a third switch is a low frequency port; the first switch selectively turns on a combiner through a fourth switch, and meanwhile the third switch turns on the combiner so as to realize carrier aggregation of high frequency signals and low frequency signals; and the second switch can selectively turn on the combiner through the fourth switch, and meanwhile the third switch turns on the combiner so as to realize the carrier aggregation of medium frequency signals and the low frequency signals. In the scheme, the radio frequency circuit switch chip can switch to control the radio frequency signals of different frequency bands to perform the carrier aggregation, thereby reducing the insertion loss of the radio frequency circuit and improving the carrier aggregation flexibility of the radio frequency signals by the electronic device.

The invention relates to a hexagonal resonant cavity substrate integrated waveguide filter. The hexagonal resonant cavity substrate integrated waveguide filter comprises a medium substrate, and upper surface metal copper and lower surface metal copper, which are respectively positioned on the upper and lower surfaces of the medium substrate, wherein plated through holes are arrayed to form a first hexagonal resonant cavity, a second hexagonal resonant cavity and a third hexagonal resonant cavity, which are sequentially connected and are in a shape of regular hexagon; the first hexagonal resonant cavity and the third hexagonal resonant cavity are in mirror symmetry around the central axis of the second hexagonal resonant cavity and are not adjacent; the right upper side edge of the first hexagonal resonant cavity and the left lower side edge of the second hexagonal resonant cavity are coincided and provided with a first sensitive coupling window; the right lower side edge of the second hexagonal resonant cavity and the left upper side edge of the third hexagonal resonant cavity are coincided and provided with a second sensitive coupling window; a coplanar waveguide input end is arranged at the left lower side edge of the first hexagonal resonant cavity; and a coplanar waveguide output end is arranged at the right lower side edge of the third hexagonal resonant cavity.

The invention provides a multiband wireless signal transceiver system which comprises a power amplifier, a frequency switching outputting unit and a monitor, wherein the power amplifier is used for amplifying an inputted wireless signal; the frequency switching outputting unit comprises a transceiver switch used for receiving an output signal of the power amplifier, a first selector switch coupled with the transceiver switch, a filter coupled with the first selector switch and a second selector switch coupled with the filter; the filter comprises a filtering unit which is adaptive to the corresponding sections of the first selector switch and the second selector switch respectively; the monitor comprises a frequency detecting unit and a processing control unit; the frequency detecting unit is used for detecting frequency signals of the power amplifier and the frequency switching outputting unit; and the processing control unit is used for controlling the gain of the power amplifier and the corresponding switching sections of the first selector switch and the second selector switch according to a detecting result of the frequency detecting unit. The multiband wireless signal transceiver system is suitable for wider frequency signals, the cost is lowered and the efficiency is improved.

The invention belongs to the field of terahertz imaging technologies, relates to a modulation device in the related field of terahertz imaging, and in particular provides an optical control terahertz wave amplitude modulator based on a silicon nanoneedle. The optical control terahertz wave amplitude modulator comprises a semiconductor laser, an optical fibre, an optical fibre modulator and a terahertz amplitude modulation structure; laser generated by the semiconductor laser enters the optical fibre modulator through optical fibre coupling; the optical control terahertz wave amplitude modulator is characterized in that the terahertz amplitude modulation structure is composed of a silicon-based bottom layer and a silicon nanoneedle tip array on the surface; and the optical fibre modulator outputs modulated laser incident to the surface of the silicon nanoneedle tip array. According to the optical control terahertz wave amplitude modulator disclosed by the invention, a dual-layer structure including the silicon nanoneedle tip array and a high-resistivity silicon/intrinsic silicon layer is adopted; the silicon nanoneedle tip array has the gradient change of a refractive index on the surface of high-resistivity silicon/intrinsic silicon; reflection of terahertz wave and pumping laser can be reduced simultaneously; the insertion loss of the device is obviously reduced; the pumping laser utilization rate is increased; and the device has relatively high modulation depth under relatively low pumping laser power.