55results about How to "VSWR is small" patented technology

The invention relates to a broadband radial pattern leaky coaxial cable used for subway and a manufacturing method thereof, and the leaky coaxial cable has the double functions of transmission line of information and duplexer. The structure of the leaky coaxial cable consists of an inner conductor, an insulation layer, an outer conductor and a jacket, wherein, the inner conductor is externally covered with the insulation layer which is externally covered with the outer conductor that is externally sheathed with the jacket, and the insulation layer that covers on the surface of the inner conductor adopts nitrogen or carbon dioxide physical foam to form a foamed polyethylene insulation layer; cambered slotted holes are opened on a clutch gold belt of the outer conductor covered outside the insulation layer. The manufacturing method comprises the steps: (1) a spiral wrinkle inner conductor is manufactured by longitudinal covering welding and embossing by using a copper strip; (2) the nitrogen or the carbon dioxide are adopted to be injected into the smelted polyvinyl plastics, and then the physical foamed polyethylene insulation layer is formed on the surface of the inner conductor by extrusion and cladding; (3) the slotted holes broken out by the clutch gold belt of the outer conductor are the cambered slotted holes; (4) the clutch gold belt of the outer conductor is covered on the insulation layer longitudinally, and the surface of the clutch gold belt of the outer conductor is crowded and covered with the jacket.

The invention provides an antenna structure and a communication terminal. The antenna structure comprises a first antenna radiator, a second antenna radiator, a first impedance matching circuit, a second impedance matching circuit and a signal source, The first antenna radiator and the second antenna radiator are coupled through a slot. One end, away from the gap, of the first antenna radiator isgrounded, and a feeding point is arranged on the first antenna radiator; one end, away from the gap, of the second antenna radiator is grounded, and the absolute value of the difference value of the length of the second antenna radiator and the 1/4 wavelength of the third frequency band is smaller than a first specific value. The first end of the first impedance matching circuit is connected withthe feed point, and the second end of the first impedance matching circuit is connected with the first end of the signal source. The first end of the second impedance matching circuit is connected with the third end of the first impedance matching circuit, and the second end of the second impedance matching circuit is grounded. The second end of the signal source is grounded. According to the embodiment of the invention, the voltage standing wave ratio of the antenna can be reduced, and the performance of the antenna is improved.

A tunable dual band antenna system is disclosed. The system includes a transceiver, a matching network and an antenna. The matching network is operable to tune the antenna to the transceiver at both a first and second frequency. Accordingly, the matching network has a variable capacitor, an inductor and a second capacitor. The value of the variable capacitor is chosen to tune the antenna at the first frequency and the second frequency such that the system can be used to transmit and receive electromagnetic energy over two bandwidths. The values of the variable capacitor, the inductor, and the second capacitor are chosen to minimize the standing wave ratio of the system at both the first frequency and the second frequency.

The invention discloses an end pressure type coaxial load. The end pressure type coaxial load comprises a cylindrical resistor, a compressed spring, an inner conductor, an insulating medium and an outer conductor which are coaxially arranged, as well as an end face shaft sleeve, wherein a compressed spring and a resistor hole are formed in the tail of the inner conductor; the cylindrical resistor is cylindrical; the two ends of the cylindrical resistor are sintered with silver resistors, and the other part of the cylindrical resistor is sintered with a thick-film resistor; the insulating medium is of a circle structure; the single side of the insulating medium is cut off through a seamless cutting technology, and impedance compensation rings are arranged on the both sides; the end face shaft sleeve is positioned at the top part of the outer conductor, used for positioning the insulating medium, the inner conductor and the cylindrical resistor, and meanwhile participates in transmission of electrical performance; cooling fins are arranged on the outer periphery of the outer conductor; a coaxial step type conical transmission cavity is defined inside the outer conductor. The end pressure type coaxial load disclosed by the invention is simple in structure, stable and reliable in properties, high in signal transmission efficiency, high in working frequency band, simple to assemble, easy to operate, and suitable for large batch production.

The invention discloses a low profile vertical polarization ultra wide band omnidirectional antenna comprising a plurality of triangular metal pieces, short circuit metal posts, circular metal pieces,a rectangular ground plate and coaxial feeding parts. Each triangular metal piece is a right-angle triangular metal piece. The short right-angle sides of the plurality of right-angle triangular metalpieces are vertically disposed on the same axis and distributed in central symmetry. The circular metal pieces are disposed on the upper portions of the long right-angle sides of the triangular metalpieces. The ends of the long right-angle sides of the triangular metal pieces are provided with the short circuit metal posts, the upper ends of the short circuit metal posts are connected to the triangular metal pieces, and the lower ends are disposed on the rectangular ground plate. The coaxial feed parts are disposed at the lower ends of the short right-angle sides of the triangular metal pieces. The triangular metal pieces are adopted to reduce the antenna weight and reduce the antenna height effectively. Metal discs are arranged to achieve capacitive loading, and the short circuit metalposts are arranged to achieve inductive loading. The operating frequency of the antenna is effectively reduced, and the radiation efficiency of the antenna is improved.

The invention discloses a small-sized wideband power splitter, which comprises two groups of magnetic core transformer windings which are respectively 1:2 impedance transformers and two power splitters, wherein the signal output ends of the 1:2 impedance transformers are signal input ends of the two power splitters; the signal output ends of the 1:2 impedance transformers are connected in parallelwith a capacitance element used for absorbing leakage inductance; an isolation resistor is in span connection between the output ports of the two power splitters. The two ferrite magnetic cores are respectively used as an impedance conversion network and a power distribution network; the impedance matching effect is higher; the insertion loss is smaller; the electromagnetic parameters of the ferrite magnetic core materials meet the complementary relationship; the performance consistency of the power splitter in the board frequency band range is ensured; an impedance converter uses three strands of copper core enamelled wires for winding; by regulating the diameter and length of the winding coil L3 enamelled wires, the voltage standing wave ratio at the signal input port is smaller; the batter impedance matching is realized.

The invention discloses a vertical integrated isolation transition power divider, and aims to provide a vertical transition and power distribution integrated power divider which is compact in structure, high in isolation and low in loss. Two paths of high-resistance matching strip lines (10) etched between the inner layer ground (6) and the upper surface ground (7) are isolated from each other; two paths of n-shaped bent isolation strip-shaped lines (13) which are centrosymmetric are in transition connection with two paths of low-resistance matching strip-shaped lines (11); two paths of low-resistance matching strip lines respectively pass through branch ports of two paths of branch port strip lines (12) opposite to the cascade input end and the output end, and four paths of coupling striplines of the isolation strip line are cascaded with two opposite isolation resistors (14). Smooth transition of an interlayer structure of the multilayer dielectric plate (1) and efficient power distribution or synthesis are achieved through impedance conversion.

The invention discloses a phase-adjustable radio frequency coaxial connector which comprises an outer conductor (1) and an inner conductor (7), wherein the inner conductor (7) is arranged in a dielectric body (6); the dielectric body (6) is arranged in the outer conductor (1); a transfer needle (8) is connected with a core wire of a cable (10); the inner conductor (7) and the transfer needle (8) form an inner conductor sliding contact pair; an adjusting turnbuckle (3) is arranged at the tail end of a connector; the adjusting turnbuckle (3) is respectively connected with the outer conductor (1) and a sleeve (5); the rotation of the turnbuckle (3) is adjusted to drive the inner conductor sliding contact pair to telescope and the sleeve (5) to move in the outer conductor (1) to adjust the length of the connector; and a locking screw (4) locks the adjusting turnbuckle (3), the outer conductor (1) and the sleeve (5). The invention can simplify the phase matching process, improve the matching accuracy and reduce the production cost, and has small volume, convenient adjustment, large adjustment range, high accuracy, low insertion loss, low voltage standing wave ratio and high stability.

The invention relates to the technical field of dual-polarized antenna sensor devices, in particular to a dual-polarized broadband antenna device based on a dielectric integrated coaxial line. A metalback cavity is arranged to reduce a back lobe of a directional pattern; with a dielectric loading unit, the input impedance of a dual-polarized antenna is adjusted to obtain a good input voltage standing wave ratio; on the basis of conversion balun structure from a dielectric integrated coaxial line to a coplanar strip line, a Vivaldi type symmetrical vibrator is excited by using a bending stripline; and with an impedance conversion circuit from the dielectric integrated coaxial line to the microstrip line, connection between an antenna input terminal and the coaxial cable is realized. The conversion balun structure from the dielectric integrated coaxial line to the coplanar strip line is in a bending type strip line feeding mode; the feeding coplanar strip lines of two polarized ports are isolated mutually at a bending part; and the heights of the coplanar strip lines of two polarized ports are different in a vertical direction. The dual-polarized broadband antenna device having thegreat actual application value is suitable for the radar, communication, navigation and other systems.

The invention discloses a one-fourth wavelength arrester consisting of the following steps: an inner conductor is arranged in a shell; an inner conductor is arranged in a shell body; the shell body is perpendicularly and fixedly connected with the shell by a screw thread; brass material is adopted in the threaded connecting part between the shell body and the shell; other parts adopt aluminum material. As the structure of combining brass and aluminum is adopted in the shell body and the shell, the arrester has the advantages of light weight, manufacturing cost being reduced by one-fifth, low voltage standing wave ratio, outstanding third-order intermodulation and good air tightness. The characteristic impedance of the arrester is 50 ohm and the work center frequency of the arrester is 880 MHz.

The invention discloses a full-band double-layer trapezoidal digital television transmitting antenna, which includes an antenna unit, a connector, and a reflection plate. The connector supplies powerto the antenna unit. The connector and the antenna unit are fixed to the reflection plate. The antenna unit includes two groups of double-layer trapezoidal dipole units, adjustable insulating screws,a first feeding metal strip, a second feeding metal strip, a stepped linear impedance converter, a balun structure and a support structure. The stepped linear impedance converter includes a vertical linear impedance converter, a horizontal stepped impedance converter, and a compensating complex impedance connector which are connected successively. The full-band double-layer trapezoidal digital television transmitting antenna can cover the full frequency band of a digital television, can withstand large power, has a low voltage standing wave ratio, low cost, and high gain, and is easy to debug.

The invention discloses a high-isolation dual-polarization microstrip type 4G LTE MIMO antenna, and the antenna comprises two FR4 PCBs. The first PCB is a single-side board, and a microstrip paster is located on the single-side board. The second PCB is a double-side board, wherein one surface of the PCB is coated with copper, and is provided with two H-shaped slits which are perpendicular to each other, and the other surface of the PCB is provided with two microstrip lines which are perpendicular to each other, and one diamond-shaped polarization isolator. Two ends of the diamond-shaped polarization isolator are connected with copper foil on the other surface of the PCB through a via hole. One end of each of the two microstrip lines is connected with a coaxial line, and the other end of each of the two microstrip lines is located on the projection of the H-shaped slit, and is perpendicular to the H-shaped slit. The slits are located exactly below an antenna radiation paster, and are close to the top of the antenna radiation paster. The diamond-shaped polarization isolator located between the two microstrip lines is used for isolating the radiation between the two microstrip lines. The antenna is good in electrical performance, is small in size, is simple in structure, and is low in cost. The antenna can serve as a single antenna, and also can serve as an element of an antenna array.

The invention discloses a Ku-frequency-band miniaturized polarization rotating mechanism assembly, and belongs to the field of communications. The Ku-frequency-band miniaturized polarization rotatingmechanism assembly comprises a rotating mechanism for adjusting signal polarization matching and a rotating joint for transmitting a signal, wherein the rotating mechanism comprises a center waveguideused as a rotor and a fixed barrel used as a stator; the center waveguide is movably assembled in an inner cavity of the fixed barrel; the side wall of the center waveguide is fixedly connected witha rotor matching block; the inner wall of the fixed barrel is fixedly connected with a stator matching block; a side waveguide channel which circularly extends along the periphery of the center waveguide is closed between the rotor matching block and the stator matching block; two ends of the side waveguide channel are respectively communicated with a signal input coupling port reserved on the center waveguide and a signal transceiver side port reserved on the fixed barrel; and a polarization angle of the side waveguide channel is changed by changing an angle between the rotor matching block and the stator matching block. A mode adopted in the Ku-frequency-band miniaturized polarization rotating mechanism assembly is to rotate a polarization separator inside a feed source network to realize matching of polarization of an antenna with polarization of an external signal; and as the rotated polarization separator is small in size, the complexity of the rotating mechanism is reduced, and the size of a servo motor which drives the rotation is reduced.

The invention discloses a test-grade cable, comprising an inner conductor (1) and an outer dielectric layer (2), characterized in that: the material of the inner conductor (1) is silver-plated copper, and the material of the dielectric layer (2) is It is PTFE, and the dielectric layer (2) is wound on the inner conductor (1) by wrapping. The beneficial effects of the present invention are: due to the special structure of the present invention, the stability of the amplitude and phase of the cable can be maintained during use, while ensuring that the device under test has high precision and good consistency, and the voltage standing wave ratio VSWR<1.340GHz , the phase change degree of the product PhaseStability<±8.0°40GHz, and the insertion loss change of the component is less than 0.1dB40GHz. Therefore, the present invention not only has good consistency and stability of performance indicators, ultra-low voltage standing wave ratio, but also has excellent phase and amplitude stability.

The invention discloses a microwave high-power material and a preparation process thereof. The preparation process includes: preparing aluminum oxide ceramic powder, industrial silicon, water and dextrin according to proportion, adding the aluminum oxide ceramic powder, the industrial silicon and the dextrin into a grinder, grinding for 20-40 minutes, adding the water, grinding for 20-40 minutes,taking out, and aging for 70-75 hours; placing the powder material into a mould, applying pressure of 8-12MPa, maintaining the pressure for 8-15 seconds, demoulding to take out a formed wave-absorbingmaterial green body, and placing at normal temperature for 70-75 hours; placing the wave-absorbing material green body into an electric kiln, and sintering according to the corresponding relation between sintering set temperature and sintering set time; cutting the wave-absorbing material green body into a required product shape, performing fine grinding, heating to 150 DEG C in a drying oven, keeping the temperature for 20 minutes, taking out, and cooling to room temperature to obtain the microwave high-power material. The microwave high-power material and the preparation process has the advantages that when the prepared microwave high-power material is applied to high frequency, material size is increased evidently, and processing difficulty is lowered evidently; the actually measured indexes of the material can satisfy use requirements, and the power of the material is increased greatly.

The invention relates to a curvilinear circular polarizer and belongs to the technical field of communication to solve the problem in the prior art that a printed board has a large number of layers, and is complicated to manufacture and high in processing cost. The curvilinear circular polarizer includes an upper curvilinear gate layer and a lower curvilinear gate layer arranged in parallel from top to bottom. The lower curvilinear gate layer is used for receiving a linearly polarized wave where an electric field vector and the lower curvilinear gate layer plane have an intersection angle of 45 degrees, and generating a linearly polarized electric field vector 1 around the linearly polarized wave. The linearly polarized wave passes through the lower curvilinear gate layer and the upper curvilinear gate layer from bottom to top. The upper curvilinear gate layer is used for receiving the linearly polarized wave, generating a linearly polarized electric field vector 2 having a phase difference of 90 degrees with the linearly polarized electric field vector 1, and generating a left-handed or right-handed circularly polarized wave over the upper curvilinear gate layer. The curvilinear circular polarizer has a wide band, low profile, low loss, low cost, high circular polarization fineness, simple structure, light weight, less accessory structure, and is easy to process and assemble.

The invention discloses a low-loss stationary-phase 700PPM semi-rigid cable assembly which comprises a semi-rigid cable and RF connectors connected to the two ends of the semi-rigid cable respectively. Each RF connector is composed of an internal conductor, an external conductor, a front threaded sleeve, a casing and a tail sleeve, the casing is inserted into the rear end of the front threaded sleeve and fixed by a clasp, a first insulator is inserted into the head portion of the casing, the internal conductor is supported in the casing by the first insulator, and the head end of the internal conductor extends into a central threaded hole of the front threaded sleeve; the external conductor is inserted into the casing, and the rear end surface of the external conductor is isolated from the rear end surface of the internal conductor via a second insulator; and the rear end of the casing is connected with the tail sleeve via threads. The semi-rigid cable assembly is characterized by low voltage standing-wave ratio, low loss, stationary stability of 700PPM and the like, and can meet requirements for the aerospace environment.

The invention discloses an unmanned aerial vehicle defense system based on the electromagnetic fence technology, and relates to the technical field of unmanned aerial vehicle defense, in particular tothe unmanned aerial vehicle defense system based on the electromagnetic fence technology. The unmanned aerial vehicle defense system comprises a signal generating unit, a power amplifying unit and anelectromagnetic fence. The electromagnetic fence does not influence surroundings and a protected area when preventing unmanned aerial vehicle invasions, can be free of the influence of terrains, vegetation and buildings, and is not limited by the complex electromagnetic environment of cities and towns, and the unmanned aerial vehicle electromagnetic defending fence is perfectly provided. A leakage cable is adopted as a main material of the electromagnetic fence, the electromagnetism fence is long in service life, and the service life can reach 10 to 50 years. A trapping signal generator serves as one kind of signal generating unit, and can generate satellite navigation analog signals at arbitrary designated spots and speeds, and in combination with the electromagnetic fence, unmanned aerial vehicle invasions can be prevented, an unmanned aerial vehicle entering the fence can be expelled outwards, and the unmanned aerial vehicle within the fence signals can be captured or shot down.

The invention relates to a high power bayonet connector, which realizes quick connection and locking, solves the problems of time and power waste and large floor space when a screw-threaded coupling connector is arranged, improves the space utilization of the equipment, and provides possibility for weight reduction and volume reduction of the equipment. The connector comprises plugs and a socket, wherein a connecting sleeve is arranged in the socket; three uniformly distributed spiral notches are arranged in the connecting sleeve; and three staple bolts are arranged on the circumference of the front end surface of a shell in a plug 2.