148results about How to "Improve VSWR" patented technology

The invention discloses a broadband dual polarized antenna unit, which comprises a radiator and a balanced feeding device, wherein the radiator consists of four radiation fins which are symmetric in pairs and are orthogonally distributed; the balanced feeding device consists of an excitation core wire and a balanced balun; the balanced balun is simultaneously formed into a support of each radiation fin; a symmetric radiation array is as long as a half of wavelength and is as wide as a quarter of the wavelength; each radiation fin further comprises a supporting area and a radiation area which are mutually adjacent; the two short sides and long sides of the radiation area and the two waists of the supporting area form a continuous curve; the ratio of the waist length of the supporting area to the length of the short side of the radiation area to the length of the long side of the radiation area is 1:1:2; and the two waists of each of the two adjacent radiation fins are arranged in parallel and are at an interval less than 0.1 wavelengths. The dual polarized antenna unit is a radiation oscillator which is relatively wider than the broadband and has good indexes, such as a standing-wave ratio and the like in a relatively wider bandwidth.

The invention discloses a feedback type round wave-guide feed source for a microwave antenna, which comprises a round wave-guide, a taper medium support and a subreflector. The three parts are positioned on a same axial line, and tight compression-joint cooperation is adopted between the round wave-guide and the medium support and between the medium support and the subreflector. The feedback type round wave-guide feed source is characterized in that the parts are on the same axial line after being assembled; a plurality of annular grooves are processed at certain positions on the conical surface of a taper medium connecting block and a taper of the metal subreflector. Through the annular grooves processed on the subreflector and the conical surface of medium support, the invention changes the transmission direction of part reflected wave and reduces the electromagnetic energy entering the inside of a round wave-guide opening, thereby improving the standing wave ratio index of the feed source and having no influence on other indexes. The feed source with the structure has high rate of finished product for the production and processing, low cost and favorable generalizing value.

The invention discloses a method for designing partial-feed paraboloid multi-beam antenna feed array and is applicable to a satellite communication system. A reflection-side multi-beam antenna adopts a primary feed utilizing a feed array as paraboloid. The principle of forming multiple beams includes beams of the paraboloid antenna are deviated by means of transverse focus offset of the feed. According to the structural size of the integral antenna system and design procedure of feed array arrangement, a novel feed array layout is provided. The number of generable spot beams is twice times of practical feed number, all beams are tightly arranged, appointed spatial angle can be uniformly covered, and each spot beam has electrical characteristics of good gain uniformity, low minor lobe level, small beam width, high pointing accuracy and the like. The method for designing partial-feed paraboloid multi-beam antenna feed array is directly used for satellite-borne equipment or ground control communication station and has wide potential application and typical application value in the satellite communication system.

The invention provides an UWB (ultra wide band) antenna with a dual resistance band function, and relates to an UWB antenna. The UWB antenna comprises a medium substrate (105), a radiating unit (101), an impedance matching input microstrip wire (102), a folding line type EBG (electromagnetic band gap) structure (103), a cross type EBG structure (106) and a metal grounding plate (104), wherein the radiating unit (101), the impedance matching input microstrip wire (102), the folding line type EBG structure (103) and the cross type EBG structure (106) are arranged on the medium substrate, and the metal grounding plate (104) is arranged under the medium substrate. The UWB antenna has the advantages that by utilizing the radiating unit, the impedance matching input microstrip wire and the metal grounding plate, the pass band bandwidth required by the UWB is realized; by arranging the two groups of EBG structures, the dual resistance band property is realized; the two resistance bands are respectively arranged near 5.2GHz and 6.8GHz, and the interference of an UWB system on an RFID (radio frequency identification) system (6.8GHz) and a WLAN (wireless local area network) system (5.15-5.35GHz) is inhibited.

A high frequency (HF) rotary joint including a rotor and a stator is disclosed. The rotor is connected to the stator by a high frequency connection via a λ/4 line. The rotor, moreover, is mounted in the stator utilizing at least one radial aircushion bearing and at least one axial aircushion bearing. The bearings prevent contact between the rotor and the stator.

The invention relates to a dual-stopband UWB (Ultra-wide Bandwidth) antenna with steep stopbands, relating to a UWB antenna. The dual-stopband UWB antenna with the steep stopbands, is formed by a dielectric substrate (105), a radiating element (101) above the dielectric substrate, a square etching fractal structure (107), an impedance matching input microstrip line (102), a fold line type EBG (Electromagnetic Band Gap) structure (103), a criss cross EBG structure (106) and a metal earth plate (104) under the dielectric substrate. According to the dual-stopband UWB antenna with the steep stopbands, the radiating element, the impedance matching input microstrip line and the metal earth plate are utilized to realize passband width required by UWB, and the dual-stopband characteristic of the steep stopbands is realized by utilizing the two groups of EBG structures and the square etching fractal structure above the radiating element. According to the antenna provided by the invention, the two stopbands are respectively close to 5.2Ghz and 6.8GHz, so that the interference of a UWB system on an RFID (Radio Frequency Identification Device) system (6.8GHz) and a WLAN (Wireless Local Area Network) system (5.15-5.35GHz) is restrained.

The invention discloses a missile-borne conformal microstrip antenna. The microstrip antenna is characterized in that the microstrip antenna comprises a cone-shaped cavity body arranged on a missile body and a conformal microstrip antenna body; the conformal microstrip antenna body is embedded in the cone-shaped cavity body; and the shape of the conformal microstrip antenna body is designed by referring to the radian of the cone-shaped cavity body so that the surface of the conformal microstrip antenna body is conformal to the surface of the missile body outside the cone-shaped cavity body. The conformal microstrip antenna is simple in structure and convenient to use and install, and while it is ensured that the conformal microstrip antenna can receive instructions, pneumatic performance and structure reliability can be improved.

The invention discloses a non-contact type ridge waveguide, micro-strip and coupling slot probe transition structure, and aims to provide a transition circuit having wide frequency band and low insertion loss. The non-contact type ridge waveguide, micro-strip and coupling slot probe transition structure in the invention is realized through the following technical scheme: a waveguide ridge extendsto be below the bottom of a windowed waveguide, and forms a section of a ridge open-end after being downwardly cut off and vertically turned; furthermore, it is separated into a waveguide coupling slot and a shielding cavity by a micro-strip substrate, which is downwardly inserted from the side wall of the window terminal of the windowed waveguide; a micro-strip probe is vertically inserted into the coupling slot from the rectangular window of the windowed waveguide; an electromagnetic coupling slot transition area is formed by facing the vertical wall surface of the ridge open-end; an electric field line parallel to the vertical surface of the ridge open-end 3 and an electric field line of the waveguide shielding cavity at the back of the micro-strip substrate act on the surface of the micro-strip probe together, so that surface current is formed; after distributed capacitance between the micro-strip probe and the side wall of the ridge open-end is offset through a section of high-impedance micro-strip line in the window channel of the windowed waveguide, a high-resistance ridge waveguide standard-TE<10> mode is converted into a micro-strip standard-TEM mode; and thus, transitionis completed.

The invention relates to a welding type radio frequency coaxial-cable assembly, comprising a connector inner conductor arranged in a connector outer conductor, a cable inner conductor and a cable outer conductor are electrically connected with the connector inner conductor and the connector outer conductor respectively, and an insulator is arranged between the cable inner conductor and the cable outer conductor. The welding type radio frequency coaxial-cable assembly is characterized in that: the cable inner conductor is arranged in an inner hole of the connector inner conductor, the cable outer conductor is arranged in the inner hole of the connector outer conductor, and the cable inner conductor and the cable outer conductor are respectively connected with the connector inner conductor and the connector outer conductor. In the invention, the voltage standing wave ratio is reduced to 1.06 from 1.1 and three-order intermodulation is reduced to -168dBc from -139dBc, thereby effectivelyensuring good, stable and reliable electrical connection, ensuring the stability of electrical property and greatly improving the indexes of the voltage standing wave ratio and the three-order intermodulation. By adopting the welding type, half of parts are reduced, the weight of the connectors is reduced by 48 percent, and material cost is greatly saved.

A surface-mount antenna, in which a radiation electrode to be connected to a radio-communication high-frequency circuit to operate as an antenna is formed on a base member 2. One end of the radiation electrode serves as a feeding portion for being connected to the radio-communication high-frequency circuit, and the other end of the radiation electrode is an open end. The radiation electrode includes a portion whose width is increased as it goes from the feeding portion toward the open end. The base member includes a band-like feeding electrode connected to the feeding portion of the radiation electrode to serve to connect the feeding portion to the high frequency circuit, and a ground electrode disposed on one side or both sides of the feeding electrode with a defined spacing between the feeding electrode and the ground electrode. The spacing between the ground electrode and the feeding electrode is set to be smaller than the width of the feeding electrode.

The invention discloses a power divider capable of continuously reconstructing a power distribution proportion, comprising a microstrip unequal Wilkinson power divider, a T-shaped circuit structure based on voltage regulation, a medium substrate and a floor metal layer; the microstrip unequal Wilkinson power divider and the T-shaped circuit structure based on the voltage regulation are adhered on one side of the medium substrate; the floor metal layer is adhered on the other side of the medium substrate; and the output power of the power divider on two output terminals is freely regulated between 1:2 and 1:4. The power divider capable of continuously reconstructing power distribution proportion is simple in structure, easy in processing, small in volume and is easy in integrating in other systems. The power divider is widely applicable to various microwave circuits and can better satisfy the performance requirement of the power divider.

The invention relates to a laminated differential broadband base station antenna, which comprises an antenna main body, a reflecting plate and a coaxial line, wherein the antenna main body is arrangedabove the reflecting plate through the coaxial line, the antenna main body comprises a radiation unit, a cross-shaped feed structure, a parasitic unit, a first dielectric substrate and a second dielectric substrate, the radiation unit and the cross-shaped feed structure are installed on the lower surface and the upper surface of the first dielectric substrate respectively, the parasitic unit is installed on the lower surface of the second dielectric substrate, the second dielectric substrate is placed above the first dielectric substrate, the radiation unit is composed of four linear radiation arms, and the tail end of each radiation arm of the radiation unit is loaded with an L-shaped branch knot. The structure provided by the invention meets the electrical performance of the antenna, and has excellent radiation performance; and compared with a traditional single-port antenna, the antenna of the invention has the advantages that the anti-interference capability of the antenna is improved by adopting dual-port feeding, and the antenna is made of a PCB and has the advantages of low cost, simplicity in processing and the like.

The invention provides a microstrip radiation unit for a 5G system and an antenna. The microstrip radiation unit comprises a PCB plate (1), a metal guiding sheet (2), a radiation body and a groundinglayer (6); the PCB plate (1) serves as a base material; the radiation body is a copper-clad layer and is attached onto the upper surface of the PCB plate (1); the metal guiding sheet (2) is suspendeddirectly above the radiation body; the grounding layer (6) is a copper-clad layer and is attached onto the lower surface of the PCB plate (1); the radiation body includes a radiation main body (3) anda microstrip line (5), the microstrip line (5) and the radiation main body (3) intersect at a feed point L1; the direction of the microstrip line (5) and the direction of the radiation main body (3)are identical; and the microstrip line (5) is provided with a matching section (4). According to the microstrip radiation unit of the invention, a microstrip line patch array form is adopted, and therefore, the microstrip radiation unit is simple in structure and can be quickly assembled, and provides a favorable technical basis for the miniaturization of a 5G base station antenna.

The invention discloses a photovoltaic millimeter wave power synthesis circuit, which comprises a first load, a second load, a micro-strip line group and photoelectric conversion modules, wherein the micro-strip line group is formed by sequentially connecting N micro-strip lines in series; one end of the micro-strip group is connected to one end of the first load, while the other end of the micro-strip line group is connected with one end of the second load; both the other end of the first load and the other end of the second load are grounded; a common connection end of every two adjacent micro-strip lines in the micro-strip line group is connected with one photoelectric conversion module; each photoelectric conversion module is grounded; and each photoelectric conversion module is formed by sequentially connecting M photoelectric conversion units in series, wherein the N is greater than or equal to 3, and the M is greater than or equal to 2. The photovoltaic millimeter wave power synthesis circuit has the advantages that not only photoelectric conversion output power is increased but also output cutoff frequency is increased, so that work bandwidth is widened.

There is provided a chip antenna including: a dielectric block; a first conductive pattern formed on at least one surface of the dielectric block to connect to an external feeding part; a second conductive pattern spaced apart from the first conductive pattern at a certain distance so as to be capacitively coupled to the first conductive pattern to act as a radiator, the second conductive pattern having one end connected to an external ground part; and a third conductive pattern spaced apart from the first conductive pattern at a certain distance so as to be capacitively coupled to the first conductive pattern to enable impedance matching of the antenna, the third conductive pattern having one end connected to the external ground part.

The invention provides a simple polarization tracker for communication in motion. The tracker comprises an orthogonal mode coupler, a polarization selector and a stepping motor, wherein the orthogonalmode coupler sequentially comprises an upper waveguide structure block, a middle waveguide structure block and a lower waveguide structure block from top to bottom, the upper waveguide structure block, the middle waveguide structure block and the lower waveguide structure block are connected to form a first channel and a second channel which are parallel to each other, a through hole is formed inthe middle waveguide structure block and close to the center of a bottom surface of a tail end of an inner cavity of a first rectangular waveguide, a cylindrical dielectric block is arranged in the through hole, a first probe is arranged in the center of the cylindrical dielectric block, the first probe is a cylindrical metal probe, a polarization torsion structure is arranged close to an input end of an inner cavity of a second rectangular waveguide, a medium rotor is arranged in the polarization selector, a second probe is arranged at one end of the medium rotor, and the second probe is a Z-shaped cylindrical metal probe. The simple polarization tracker has advantages of simple structure, convenient machining and assembling and low cost.