363results about How to "Low return loss" patented technology

An optical fiber connector assembly includes a receptacle, two connectors accommodated in respective accommodation grooves in the receptacle and having a respective clip located at a top side thereof for engagement with a respective retaining groove in a mating optical fiber adapter, an optical fiber cable having two optical fibers respectively mounted in the connectors, and a sliding cover covered on the receptacle and movable relative to the receptacle to elastically deform the clips and to further disengage the clips from the respective retaining grooves of the optical fiber adapter for allowing removal of the optical fiber connector assembly out of the optical fiber adapter with less effort.

A ferrule for an optical fiber connector having open fiber clamping grooves. The ferrule has a body having a plurality of open grooves for clamping the terminating end sections of optical fibers. At least a section of the longitudinal opening of the groove is provided with opposing lips to provide a clamping effect. The width of the longitudinal opening defined between the lips along at least a section of the grooves is narrower than the diameter of the optical fibers to create a tight fit. The grooves and the width of the longitudinal groove openings are shaped and sized to retain the fibers without any clearance to allow for movement of the fiber relative to the groove. Similar grooves may be provided in the ferrule body for alignment guide pins. The grooves are precision formed by high throughput processes, such as stamping and extrusion.

In a multi-carrier transmission scheme (frequency domain multiplexed—FDM), a single high rate data stream is split into multiple lower rate data streams each transmitted over a different carrier (e.g., a tone or bin). The data rate possible from a multiple-carrier transmission scheme is theoretically equivalent to the data rate possible from a single-carrier (including baseband) scheme with the same composite bandwidth. The scheme allows for a communications system that can selectively send each data signal (e.g., audio data, video data, raw data, etc.) partitioned out into full and half duplex sections (e.g., tones). The scheme can have a reduced complexity and cost and use less bandwidth. This is done by being able to selectively split a data signal into both full and half duplex tones.

A compliant structure clamps the alignment pins to accurately and precisely locate the alignment pins. The compliant structure supports the alignment pins with no clearance. The compliant structure is defined by at least a flexure in the form of a cantilevered structure extending at a side of the ferrule. The cantilevered structure, with or without a complementary support structure, defines a space in which an alignment pin can be supported. The flexure may be defined by one or more slots provided on the body of the ferrule to facilitate bending of the extended cantilevered structure. In another embodiment, the ferrule comprises a ferrule insert having grooves for supporting optical fibers, and a ferrule frame that supports the ferrule insert and alignment pins. The compliant structure is provided on the frame. In a further embodiment, the ferrule insert is provided with optical fiber grooves at its perimeter.

The invention discloses a double-frequency and double-polarization antenna capable of operating in a compass satellite navigation system and a mobile third-generation (3G) network and is implemented in a form of a laminated micro-strip circuit. The double-frequency and double-polarization antenna capable of operating in the compass satellite navigation system and the mobile 3G network comprises an upper-layer micro-strip antenna, a lower-layer micro-strip antenna and a metal floor layer, wherein the upper-layer micro-strip antenna has an upper-layer patch; the lower-layer micro-strip antenna has a lower-layer patch; the metal floor layer is arranged on a bottom layer; the upper-layer micro-strip antenna and the lower-layer micro-strip antenna share one metal floor layer; and the antenna is provided with six short-circuit metal columns which pass through the upper-layer micro-strip antenna and the lower-layer micro-strip antenna from the upper-layer patch and then are connected with the metal floor layer which is arranged on the bottom layer. The antenna adopts a feeding mode of dual-port coaxial feeding and has the advantages of simple and compact structure, miniaturization, convenience for processing and industrialized application, and the like.

The invention provides an ultra-wide-band horn antenna comprising a mode conversion feedback cavity part, a coaxial line excitation part, and a double-ridged horn part. The mode conversion feedback cavity part includes a feedback cavity, a short-circuit board, a cross bump, a wedge, a slope, an upper ridge, and a lower ridge. Through a metal sleeve, the short-circuit board, the slope, the wedge, a horn narrow side wall and other structures, the antenna has low voltage standing wave ratio and good radiation pattern. In the whole working frequency band of the antenna, the standing wave of the antenna is effectively reduced, and the gain of the antenna is improved. The horn narrow side wall is composed of a position-adjustable metal gate, so that the horn antenna has good low-frequency characteristic, the high-frequency radiation pattern is not deteriorated, and satisfactory impedance matching and radiation characteristics are obtained in the wide band from 0.8GHZ to 20GHZ. The ultra-wide-band horn antenna has the advantages of large power capacity, wide frequency band, high gain, and good directivity.

The invention belongs to the technical field of antennas, provides an ultra-wideband low-profile circularly-polarized two-arm spiral antenna, and aims at solving the contradiction of consideration of ultra-wideband, low profile, circular polarization and high gain development of an existing spiral antenna. The spiral antenna comprises a back cavity, a radiator dielectric substrate, an antenna spiral arm, a balun and a coaxial joint, wherein a feeding port is formed in the center of the radiator dielectric substrate; the antenna spiral arm is located on the upper surface of the radiator dielectric substrate and is connected with the upper end of the balun through the feeding port; the balun is located in the back cavity; the lower end of the balun is connected with the coaxial joint; the back cavity comprises a cylinder and a slope; the cylinder is arranged at the center of the back cavity; the slope is connected with the cylinder; the cylinder and the slope jointly form a circular truncated cone; an annular groove and a window are formed in the cylinder; and the window is used for arranging the balun. By the spiral antenna provided by the invention, the performance requirements of the wide band, low profile, circular polarization and high gain of the spiral antenna are well considered; and meanwhile, the frequency band bandwidth of the antenna is greatly improved.

The invention discloses a Faraday rotator suitable for a high-power opto-isolator. The Faraday rotator comprises a thermal compensation crystal, a half-wave plate, an iron ring, a first magnetic rotation crystal, a second magnetic rotation crystal, a first magnet and a second magnet. The first magnetic rotation crystal, the thermal compensation crystal, the half-wave plate and the second magnetic rotation crystal are laid out in the forward sequence of a Z axis, the iron ring is connected to the outside of the thermal compensation crystal and the outside of the half-wave plate in a sleeved mode, the first magnet is connected to the outside of the first magnetic rotation crystal in a sleeved mode, and the second magnet is connected to the outside of the second magnetic rotation crystal in a sleeved mode. When used for the opto-isolator, the Faraday rotator enables the opto-isolator to meet the requirement for high power of hundreds of watts and improves isolation degrees by at least 3dB.

Improved phased array techniques and architectures are provided. For example, a linear phased array includes N discrete phase shifters and N−1 variable phase shifters, wherein the N−1 variable phase shifters are respectively coupled between adjacent output nodes of the N discrete phase shifters such that the N discrete phase shifters reduce an amount of continuous phase shift provided by the N−1 variable phase shifters. Each of the N discrete phase shifters may select between two or more discrete phase shifts. The N discrete phase shifters also preferably eliminate a need for a variable termination impedance in the linear phased array.

The invention relates to an antenna apparatus and antenna radome and design method thereof. The antenna radome is associated with an antenna and comprises a plurality of radome elements arranged in an array. Each radome element comprises a dielectric substrate on which an upper surface is provided with a first fractal inductor layout and a lower surface is provided with a second fractal inductor layout. The second fractal inductor layout comprises a first inductor and a second inductor. The first inductor and second inductor are associated to accumulate charges so as to increase radiation directionality of the antenna.

The invention relates to a structure of a small ultra wideband (UWB) microstrip band-pass filter. The small UWB microstrip band-pass filter comprises a medium substrate, upper microstrip coupling lines, an upper microstrip transmission line, a lower metal surface, two square grooves etched on the lower metal surface and two metal grounding through holes. The bandwidth of the structure of the small UWB microstrip band-pass filter and the inhibition of second harmonic can be conveniently controlled by regulating the coupling strength of the upper coupling lines and the electrical length of the upper microstrip transmission line. Two groove structures etched on the lower metal surface can be used for improving the coupling strength among the upper microstrip coupling lines. The small UWB microstrip band-pass filter has a simple structure design and small volume, is convenient to process, has adjustable bandwidth and high electrical performance and has the obvious advantage of being easily integrated with other plane microwave millimeter wave circuits.

The invention relates to a technology of millimeter wave wireless communication and specifically relates to a 7-mode gain and output power controllable K-band power amplifier. The K-band power amplifier comprises a power supply, a control power supply, a Vdd end, a Vb end, control ends Vc1, Vc2 and Vc3, an input end, an output end and an earth wire. The Vdd end and the earth wire are in bridge joint with a positive end and a negative end of the power supply. The Vb end is connected with a bias voltage. The control ends Vc1, Vc2 and Vc3 are connected with the positive end of the control power supply. The K-band power amplifier also comprises a first Balun, a first input matching circuit, a second input matching circuit, a first drive circuit, a second drive circuit, an interstage matching circuit, a gain control stage, an interstage transformer transformer, a power-stage circuit, a first output matching circuit, a second output matching circuit and a second Balun which are connected in sequence. The amplifier is characterized by controllable 7-mode power and gain pseudo number, high power gain and high output power. The amplifier is low in transmission loss, low in phase error, low in return loss and high in port isolation degree.

A ferrule for a high density optical fiber connector, supporting a first set of optical fibers of a first fiber cable and a second set of optical fibers of a second fiber cable. The ferrule supports the first and second sets of optical fibers in at least one plane. In one embodiment, the first set of optical fibers are supported in a first row of open grooves, and the second set of optical fibers are supported in a second row of open grooves. The optical fibers in the first row are staggered with respect to the optical fibers of the second row. The ferrule comprises two halves, each having an open structure that has a row of open grooves precisely formed thereon in a plane. In another embodiment, the ferrule supports the first and second sets of optical fibers in a single row, in an alternating interleaving manner.

The invention discloses a ball grid array millimeter wave broadband matching structure in wafer-level packaging and a design method, and belongs to the technical field of microwave and millimeter wavepackaging circuit systems. A first branch signal line, a multistage stepped impedance resonator and a front-end circuit transmission line are sequentially connected with an upper surface of a microwave dielectric substrate in the positive direction of the x axis, a central signal BGA solder ball connection structure outputs millimeter wave signals, the signals are transmitted to a multi-stage stepped impedance resonator through a first branch signal line to realize broadband matching, the signals are transmitted to a front-end circuit transmission line for output by the multi-stage stepped impedance resonator, broadband matching between the central signal BGA solder ball connection structure and the front-end circuit transmission line is realized, a problem that impedance between a silicon through hole BGA interconnection impedance compensation structure and the front-end circuit signal line is not matched due to the fact that the size of the bottom of a BGA solder ball is larger thanthe width of a signal line of a front-end circuit of a microwave dielectric substrate in the silicon through hole BGA interconnection impedance compensation structure in three-dimensional wafer levelpackaging is solved.

A microstrip combline bandpass filter includes an input port, an output port, and a plurality of resonators each including a microstrip line having a first end and a second end. One of the plurality of resonators is connected to the input port, and another of the plurality of resonators is connected to the output port. The filter also includes a plurality of pairs of series coupled varactors. The first end of each microstrip line is coupled to one of the pairs of varactors, and the second end of each microstrip line is coupled to ground.

The invention discloses an ultra-high-frequency sensor for monitoring partial discharge in a switch cabinet online. The ultra-high-frequency sensor comprises a micro-strip slot antenna and an SMA (Sub-Miniature A) connector, wherein the micro-strip slot antenna comprises a dielectric substrate, wherein a grooved metal grounding plate is arranged on one side of the dielectric substrate, and the micro-strip slot antenna is arranged on the opposite side of the dielectric substrate; the SMA connector is electrically connected with the micro-strip slot antenna. From an overall perspective, the shape of the groove in the metal grounding plate is an inverted U shape; a detail design adopts a meander technology, and the path of exciting current on the surface of the metal grounding plate is changed by bending, so that the miniaturization of an antenna is realized. In application, the ultra-high-frequency sensor is light in weight, small in size and easy to manufacture, and is beneficial to be arranged in the switch cabinet; meanwhile, the sensitivity is high; a feed structure is simple and compact; the loss of a feed line is low. Simulation and experiments prove that the return loss of the sensor in a bandwidth range is less than -10 dB; in addition, the impedance matching with a standard 50-Ohm coaxial transmission line is effectively realized by optimizing micro-strip feed line parameters and feed positions.

The invention discloses a double-frequency dual-polarized antenna capable of working at a GPS (Global Position System) and TD-SCDMA (Time Division-Synchronization Code Division Multiple Access). The antenna comprises an upper layer micro-strip antenna, a lower-layer micro-strip antenna and a metal floor layer, wherein the upper layer micro-strip antenna is provided with an upper layer patch; the lower layer micro-strip antenna is provided with a lower layer patch; the metal floor layer is formed on a bottom layer; and the upper layer micro-strip antenna and the lower layer micro-strip antenna share one metal floor layer. The antenna is provided with two short-circuit metal posts which are connected with the metal floor layer on the bottom layer after being inserted into the upper layer micro-strip antenna and lower layer micro-strip antenna from the upper layer patch. In the invention, a laminated structure and a dual-port coaxial feeding mode are adopted for the antenna, so that the antenna has the advantages of simple and compact structure, small size, easiness for processing, and the like.

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.

A low-loss flat transmission line comprises a plurality of solder mask layers, a plurality of bonding layers, a plurality of dielectric layers and a plurality of connecting layers, wherein the solder mask layers are used for preventing oxidization of a metal area and contact of a shielded transmission line structure and a peripheral good conductor, the bonding layers are used for physical vertical bonding, and the dielectric layers are used for an energy transmission area. A first signal pad and a first gap surrounding the first signal pad are arranged on at least one end of the first connecting layer, at least one signal line via hole is arranged on the first signal pad, a signal transition area and a plurality of gaps on the signal transition area are arranged on at least one end of the second connecting layer, a second signal pad and a second gap surrounding the second signal pad are arranged on at least one end of the third connecting layer, the signal line via holes of the first connecting layer are communicated with signals of the first signal pad, the second signal pad and the signal transition area, and the signal transition area is connected with signal lines. By the aid of the connecting structure, L1 and C1 are optimized, the influence of discontinuity is greatly reduced, and insertion loss of the transmission line structure is furthest reduced.

The invention relates to a fractal array bionic ultra-wideband antenna which comprises a substrate and a fractal array bionic radiation patch adhering to the front side of the substrate. The fractal array bionic radiation patch is an antenna array formed by arranging 25 photonic crystal batwing bionic small antennas according to a crisscrossed array structure. The invention ensures that the antenna array has a large working bandwidth while enhancing the antenna radiation intensity through the array.

The invention proposes a connector (400) for surface mounting to a circuit substrate, the connector comprises an insulator (420), a center conductor (410) centrically mounted to the insulator and a shielding shell (430) externally mounted on the insulator, the shielding shell comprises a first portion for connecting the shielding shell with a connector and a second portion for surface mounting the connector to the circuit substrate, the second portion includes a body (432) and a plurality of solder legs (431) formed on the body, wherein the body comprises a shielding portion (434) surrounding an extending portion of the center conductor and at least one opening (433) configured to communicate inner space between the center conductor and the shielding portion with outside space of the connector when the RF connector is soldered to the circuit substrate.

The invention discloses a full optical fiber optical power monitor, comprising a photo detector and an optical fiber, characterized in that, the covering of the optical fiber is arranged with a V-shape gap for leaking the light, wherein the minimum distance of the bottom of the V-shape gap is 3-5 mu m away from the surface of the fiber core. The photo detector is arranged on the outside of the V-shape gap, for detecting the leaking light thereof. The invention receives the spectrum energy of the photo detector with high efficiency. The full optical fiber optical power monitor of the invention has low insertion loss, low echo loss and high transmitted power processing ability, which is also applied in the special optical fiber transmission system for the polarization maintaining optical fiber, also is used for manufacturing the full optical fiber apparatuses with small volume and low cost. The full optical fiber optical power monitor of the invention can be used in the high performance optical communication apparatus such as the fiber laser, the optical amplifier, the ultra-narrow light pulse generator and the like, also can be used in the optical fiber sensing field.

The ultra-wide-band filter serves as a key unit in an ultra-wide-band communication system and determines the overall performance of the system. The invention relates a microstrip ultra-wide-band band-pass filter based on a novel multi-branch multi-mode resonator. The filter is characterized in that two ends of an intermediate short-circuit transmission line node 33 are connected with two ends of a transmission line node 32 to form a closed loop, wherein the short circuit of the intermediate short-circuit transmission line node 33 is realized by a metalized through hole 34. An open-circuit transmission line node 31, an open-circuit transmission line node 35, an open-circuit transmission line node 36, an open-circuit transmission line node 37, an open-circuit transmission line node 38, and an open-circuit transmission line node 39 are respectively connected to the transmission line node 32. In addition, the filter performances are improved by connecting matching branches including a short-circuit transmission line node 12 and an open-circuit transmission line node 14 at an input port and connecting matching branches containing a short-circuit transmission line node 22 and an open-circuit transmission line node 24 at an output port, wherein the short circuit of the short-circuit transmission line node 12 is realized by a metalized through hole 13 and the short circuit of the short-circuit transmission line node 22 is realized by a metalized through hole 23. Researches show that the provided microstrip ultra-wide-band band-pass filter has advantages of high performance and miniaturization and the like.

An ultra-wideband filter is a key device in an ultra-wideband communication system, and the performance of the filter determines the integral performance of the system. The invention relates to a micro-strip ultra-wideband band pass filter, which is based on a novel multi-mode resonator (an open-circuit transmission line section 31 and an open-circuit transmission line section 32 are connected to one end of a parallel-coupled line section 33, and meanwhile the other end of the parallel-coupled line section 33 is connected with an open-circuit transmission line section 34 and an open-circuit transmission line section 35). In addition, matching branch nodes (a short-circuit transmission line section 12 (short circuiting is realized through a metallized through hole 13) and an open-circuit transmission line section 14) are connected to an input port, and matching branch nodes (a short-circuit transmission line section 22 (short circuiting is realized through a metallized through hole 23) and an open-circuit transmission line section 24) are connected to an output port to further improve the performance of the ultra-wideband band pass filter. Research shows that the ultra-wideband band pass filter has the advantages of compact size, excellent performance and the like.

The invention provides a quadric curve voltage-adjustment gain equalization circuit. The quadric curve voltage-adjustment gain equalization circuit comprises a 3dB bridge, a first attenuation unit, a second attenuation unit, varactors D1and D2, a first resonance circuit, a second resonance circuit, a capacitor C1, a capacitor C2 and a voltage control unit, wherein a first output port and a second output port of the 3dB bridge are connected with the first attenuation unit and the second attenuation unit respectively, the capacitor C1 is arranged between the first output port of the 3dB bridge and the first attenuation unit, the capacitor C2 is arranged between the second output port and the second attenuation unit, or the capacitor C1 is arranged at an input port and the capacitor C2 is arranged at a joint port; the negative electrode of the varactor D1 is connected with the first attenuation unit, and the positive electrode of the varactor D1 is connected with the first resonance circuit; the negative electrode of the varactor D2 is connected with the second attenuation unit, and the positive electrode of the varactor D2 is connected with the second resonance circuit; the other end of the first resonance circuit and the other end of the second resonance circuit are both grounded; one end of the voltage control unit is connected with the negative electrode of the varactor D1 and the negative electrode of the varactor D2, and the other end of the voltage control unit is grounded. The quadric curve voltage-adjustment gain equalization circuit can realize voltage-adjustment equalization of a quadric gain curve.

The invention discloses a planar horn antenna with an impedance calibration function, and relates to a horn antenna. The planar horn antenna comprises a micro-strip feeder (1), a horn antenna (2) and metallized via holes (3) which are integrated on a dielectric substrate (4), wherein the micro-strip feeder (1) is connected with an antenna port (5) and a narrow antenna port (6), the horn antenna (2) comprises a first metal plane (8), a second metal plane (10) and two rows of metallized via hole horn side walls (11), metallized via hole arrays (14) consisting of the metallized via holes (3) form a plurality of dielectric-filled waveguides (16) in the horn antenna (2), one end of each dielectric-filled waveguide (16) faces the narrow antenna port (6), the other end of each dielectric-filled waveguide (16) is arranged on an antenna aperture plane (15), and the wave impedance of each dielectric-filled waveguide (16) is equal to the wave impedance of free space owing to the width of the dielectric-filled waveguide (16). The planar horn antenna has the advantages that return loss of the antenna can be reduced, and gain of the antenna can be increased.