13results about How to "Small VSWR" patented technology

The invention discloses a terahertz wave band circularly polarized antenna based on sequential rotation feeding, and belongs to the field of radio frequency front-end devices. The circularly polarized antenna is composed of four microstrip patches, chamfers located on a radiation patch, a microstrip line, a microstrip line feed port, a sequential rotation feed network, a dielectric substrate, a metal ground backboard and a microstrip line matching structure. A 90-degree phase difference is generated by strictly designing the electrical length from each port to the feed network to realize circular polarization performance, right-handed circularly polarized waves are radiated, the radiation gain is 10.47 dB, the 3dB axial ratio bandwidth is greater than 8GHZ, the 3dB axial ratio range exceeds 90 degrees, and the complete half-power beam width is covered. The antenna adopts the microstrip line for feeding, the loss of the microstrip line is small, the microwave transmission characteristic is good, and the antenna radiation efficiency is high. The antenna adopts a single-layer board design, has no complex feed network, and is simple in structure and convenient to manufacture.

The invention discloses a control optimization method of a low standing-wave ratio narrow-band filter based on plasmon, and relates to the field of filter plasmon optimization control. According to the method, numerical solution is carried out on the second-order nonlinear differential equation through the fourth-order Runge-Kutta method, the dynamic coupling relation between the plasmon filter and the nonlinear resonator can be accurately described, and therefore accurate regulation and control over frequency response are achieved. In addition, by means of the optimization method, the standing-wave ratio of the narrow-band filter can be effectively reduced, signal reflection is reduced, and the transmission efficiency of the system is improved.

The utility model relates to the technical field of antennas, in particular to a broadband center-fed antenna matching coil, which comprises a magnetic core, a first cable and a second cable. The first cable and the second cable are both wound on the magnetic core, an inner core of the first cable and an inner core of the second cable are connected in series, and the winding turn number ratio of the first cable to the second cable is 3: 6 to 4: 6; the impedance of the first cable ranges from 45 ohms to 55 ohms, the impedance of the second cable ranges from 70 ohms to 80 ohms, the length of the first cable ranges from 360 mm to 400 mm, and the length of the second cable ranges from 485 mm to 525 mm. The broadband center-fed antenna matching coil provided by the utility model is used for overcoming the defects of limited frequency band and high standing-wave ratio of the existing matching coil.

The invention relates to the technical field of antenna structures, in particular to a structure device of a C-band radar integrated hidden shadow antenna and an installation method. Four antenna oscillators are installed on the outer sides of a left reflecting plate, a right reflecting plate and a rear reflecting plate through connecting pieces respectively, a one-to-four strip line power division network is fixed to the inner sides of the left reflecting plate, the right reflecting plate and the rear reflecting plate, the one-to-four strip line power division network and the antenna oscillators respectively adopt a back feed mode and a side feed mode, and an input port of the one-to-four strip line power division network is located on the outer side of a reflecting face. The shell, the cover plate and the one-to-three microstrip power divider microstrip plate form a one-to-three microstrip power divider. The overall structure is simplified, and the device has the advantages of being high in reliability, small in number of parts, light in weight, convenient to install, low in cost and the like.

The application relates to the technical field of radio frequency microwave devices, in particular to a W-waveband wide-frequency RF MEMS multi-blade multi-pole switch which comprises a silicon substrate, a plurality of input / output ports and a MEMS cantilever beam switch unit, the MEMS cantilever beam switch unit is provided with a driving electrode, and the communication and disconnection of the radio frequency signal path between the corresponding input port and the output port can be controlled by applying voltage to the driving electrode. The application realizes the on-off of the radio frequency signal path by electrostatic driving control of the deformation of the cantilever beam, and the driving mode has the advantages of low power consumption, high speed and easy integration. Compared with the common single-blade structure, the application can realize more complex signal routing in a compact unit, improves the system integration and functional flexibility, realizes interference-free crossing by using the slot structure through the horizontal swing type structure and the vertical lifting type structure, significantly reduces the high-frequency parasitic effect, and ensures the transmission quality of the millimeter wave signal in the W waveband.

The invention belongs to the technical field of electromagnetic pulse suppressors, and particularly relates to a plasma-based coaxial S-waveband strong electromagnetic pulse suppressor which comprises an outer electrode, sealing windows, an inner electrode, a discharge electrode and a solder filling area, the sealing windows are installed on steps on the two sides of the outer electrode, an open hole is formed in the center of each sealing window, and the inner electrode is arranged in the open hole. The inner electrode is coaxially fixed in an open hole of the sealing window, the discharge electrode is welded on the outer electrode, filling gas is arranged in a sealed area enclosed by the outer electrode, the sealing window and the inner electrode, and a solder filling area is arranged between the outer electrode and the sealing window. The working frequency band of the coaxial plasma pulse suppressor is in the whole S wave band, and meanwhile, a dual impedance compensation structure is adopted on the suppressor shell, so that the insertion loss and the standing-wave ratio of the whole strong electromagnetic pulse suppressor are very small in a very wide broadband; and the broadband and low insertion loss indexes which are difficult to reach by the conventional waveguide type structure suppressor are obtained.

This invention discloses an X-band direction-finding antenna and antenna device. The antenna includes an array layer, a cavity layer, and a network layer stacked sequentially from front to back. An antenna array is disposed on the array layer, and an array port is disposed on the antenna array. The array port is connected to the network layer and an output terminal disposed on the antenna through the cavity layer. The antenna device includes an antenna and an antenna support, with the antenna disposed on the antenna support. This X-band direction-finding antenna has a high degree of integration, small size, and light weight, achieving miniaturization. Simultaneously, it exhibits a low standing wave ratio and high element radiation efficiency in the X-band.

The invention relates to the technical field of rectangular waveguide slot antennas, and particularly discloses an I-shaped slot radiation antenna based on electromagnetic metamaterial design. Comprising a rectangular waveguide with a cavity, electromagnetic metamaterial structures which are arranged in the cavity and are axially and symmetrically arranged along the length direction of the rectangular waveguide, and an I-shaped gap which is arranged on the upper surface of the rectangular waveguide and is communicated with the cavity; the thicknesses of the two groups of electromagnetic metamaterial structures are axially increased along the length direction of the rectangular waveguide; and the I-shaped slot is arranged on one side of the metal short circuit surface close to the rectangular waveguide. One-way transmission is realized by introducing the electromagnetic metamaterial, the working bandwidth, the radiation efficiency and the gain of the rectangular waveguide slot antenna are improved by combining the I-shaped slot, and the standing-wave ratio is reduced.

The application discloses a kind of ultra-wideband low profile composite structure monopole antenna, including antenna radiator, metal short-circuit column, lumped loading module, metal floor and coaxial connector;The center position of the metal floor is provided with coaxial connector;Coaxial connector is connected with the bottom of antenna radiator;The antenna radiator is located above the center of metal floor and there is a certain spacing between the bottom and the metal floor, metal short-circuit column is set at equal intervals around the antenna radiator, and the bottom of metal short-circuit column is installed on the lumped loading module, and the lumped loading module is located on the metal floor.The application has the characteristics of ultra-wideband, low profile and omnidirectional radiation.

The present invention discloses a built-in antenna type street lamp structure, including a lamp holder and a lamp base, a lamp pole is connected between the lamp holder and the lamp base, the lamp pole also serves as an antenna body, an omnidirectional antenna is installed in the antenna body; the lamp base is fixed to a cement foundation by anchor bolts, a wiring tube is arranged in the cement foundation; the omnidirectional antenna includes a dielectric substrate, a plurality of groups of radiation units are arranged on the dielectric substrate, any radiation unit includes a first radiation arm arranged on the front of the dielectric substrate and a second radiation arm arranged on the back of the dielectric substrate, the first radiation arm and the second radiation arm are arranged symmetrically up and down, and a feeding device for connecting a cable device is arranged between the two. The present invention can achieve signal coverage of the 806-960MHz frequency band while meeting normal lighting requirements, and has the advantages of good concealment, small size, light weight, and low cost, which can greatly reduce the panic of community residents about the electromagnetic environment.

The utility model relates to the technical field of antennas, in particular to a 0.02 GHz-6GHz broadband signal emission combined antenna device, which comprises an emission installation panel and nine omnidirectional antennas installed on the emission installation panel, the arrangement sequence and the spacing of the antennas are as follows: an antenna 4, an antenna 6, an antenna 2, an antenna 1, an antenna 3, an antenna 5, an antenna 7, an antenna 9 and an antenna 8 in sequence from left to right, the spacing between the antenna 4 and the antenna 6 is 5cm, and the spacing between the antenna 4 and the antenna 6 is 5cm. The distance between the antenna 6 and the antenna 2 is 10cm, the distance between the antenna 2 and the antenna 1 is 15cm, the distance between the antenna 1 and the antenna 3 is 15cm, the distance between the antenna 3 and the antenna 5 is 10cm, the distance between the antenna 5 and the antenna 7 is 5cm, the distance between the antenna 7 and the antenna 9 is 5cm, the distance between the antenna 9 and the antenna 8 is 5cm, the distance between the antennas with similar frequencies is more than 15cm, near-field electromagnetic coupling is weakened, the positions of high-frequency and low-frequency antennas are staggered, and octave interference is avoided. After optimization, the standing-wave ratio of the antenna array is reduced, and the mutual coupling strength is weakened.

The utility model relates to passive device technical field discloses a kind of attenuating piece type absorbency high-frequency load device, including the circular recess being opened in the heat dissipation shell inside, the cylindrical cavity is fixedly installed in the circular recess inside, the first recess is opened in the cylindrical cavity inside, the high-frequency (24G) attenuating piece is fixedly installed in the first recess, the high-frequency (24G) attenuating piece side and the circular recess bottom in heat dissipation shell abut;This kind of attenuating piece type absorbency high-frequency load device, rotates bolt by inside hexagonal spanner, makes and connects the sliding block of rotating bolt sliding into the Ω type recess formed between high-frequency device attenuating piece and cylindrical cavity, fine tuning to its cavity internal impedance, to reduce its reflected standing wave ratio, increase its effective absorption high-frequency (24G) signal energy efficiency, and sliding block also pledge high-frequency device attenuating piece makes high-frequency device attenuating piece and cylindrical cavity contact effect better, reduce signal reflection.

The invention provides a sectional type broadcast antenna array and a configuration design method thereof, and belongs to the technical field of aircraft profile design, and the method comprises the steps: arranging a first group of broadcast antenna arrays at the front section of an upper wall plate at the left and right sides of a dorsal fin at the tail section of a fuselage, and arranging a second group of broadcast antenna arrays at the rear section, the antenna size of the first group of broadcast antenna array is smaller than that of the second group of broadcast antenna array, the first group of broadcast antenna array comprises a plurality of first antennas, and the second group of broadcast antenna array comprises a plurality of second antennas; calculating a first minimum interval between two adjacent first antennas and a second minimum interval between two adjacent second antennas; arranging the two groups of antennas based on the minimum spacing of the two groups of antennas, and respectively determining the number of first antennas and the number of second antennas; and setting the specific positions of the two groups of broadcast antenna arrays based on the number of the antennas and the minimum spacing. According to the scheme, the signal coverage range and the transmission efficiency of the broadcast antenna array are improved, the signal interference is reduced, and the antenna gain is improved.