65 results about "Log-periodic antenna" patented technology

The invention discloses a portable soft oscillator log-periodic antenna, and relates to the technical field of non-frequency-variable antennas. The portable soft oscillator log-periodic antenna comprises an antenna main rod, a folding supporting rod and a winding mechanism, the folding supporting rod is hinged to the antenna main rod, the folding supporting rod is connected with an edge suspension wire arranged at one end, away from the hinged end, of the antenna main rod, the winding mechanism is connected with the folding supporting rod, and the folding supporting rod is connected with the winding mechanism. The winding mechanism is provided with a tightening rope connected with the folding supporting rod, the tightening rope and the side suspension wire apply force rotating in different directions to the folding supporting rod, and the antenna main rod is provided with a soft vibrator connected with the side suspension wire. According to the portable soft oscillator log-periodic antenna, through folding design of the antenna structure, the size of the antenna in a non-working state is effectively reduced, the transportation and installation convenience of the antenna is remarkably improved, and the portable soft oscillator log-periodic antenna has the beneficial effects of being foldable and convenient to transport and install.

The invention discloses a multi-band multi-gain anti-interference log-periodic antenna theoretical design method. The method mainly comprises the following steps: determining a scale factor tau and an interval factor sigma of each band through different gain requirements; calculating oscillator initial lengths corresponding to frequencies at two ends of all frequency bands; determining the number of oscillators in all frequency bands and the actual length according to the initial length, and giving a general expression of the length of the oscillators; calculating the interval and the radius of the oscillator by a general expression; the corresponding oscillator length range is calculated according to the frequencies at the two ends of the interference frequency band, the oscillators actually located in the range are removed, and the optimal length is obtained by performing logarithmic segmentation processing on the adjacent oscillators. The invention discloses a theoretical design method of a multi-band multi-gain anti-interference log-periodic antenna, which can meet the requirements of different bands and different gains of a single log-periodic antenna, reduce the longitudinal length of the antenna, facilitate the miniaturization of the antenna, inhibit interference signals and improve the detection accuracy of the antenna.

A microstrip patch log periodic antenna (MSPLPA) may include a ground plane, a dielectric material, a printed circuit board comprising a microstrip patches. Each of the microstrip patches may be configured to transmit and / or receive signals. The dielectric material may be disposed between the ground plane and the printed circuit board. Each of the microstrip patches may be frequency scaled.

The invention discloses an ultra-wideband low-profile feed source loaded with a step medium, and relates to the field of ultra-wideband feed sources. The antenna comprises four log-periodic antennas, four groups of step dielectrics, dielectric cylinders, a reflection floor, a metal cavity and two feed baluns, the four log-periodic antennas are divided into two pairs which are orthogonally arranged, each pair comprises two log-periodic antennas which are oppositely arranged, the log-periodic antennas are fixed on the dielectric cylinder through screws, and an included angle is formed between the log-periodic antennas and the reflection floor; each group of stepped dielectric is formed by arranging twelve dielectric blocks in height stepped distribution, is positioned between the log-periodic antenna and the reflection floor, and clings to the reflection floor; the two feed baluns are orthogonally arranged, and each balun comprises a dielectric substrate, an index gradient microstrip line and a one-to-two power divider. The antenna is wide in frequency band, low in profile and suitable for serving as a primary radiator of a reflector antenna in the fields of satellite communication, radar detection, radio astronomy and the like.

The invention relates to a folding and unfolding joint for an antenna, and belongs to the technical field of antennas. The device comprises a middle support and two connecting seats, wherein the two ends of the middle support are connected with the corresponding connecting seats through bearings; each connecting seat is provided with an upper group of spring connectors and a lower group of spring connectors, the two opposite upper groups of spring connectors are connected through SMA springs a, the two opposite lower groups of spring connectors are connected through SMA springs b, and the SMA springs a and the SMA springs b are located above and below the middle support respectively. The log-periodic antenna can be folded and unfolded by adopting a novel shape memory alloy material, so that the log-periodic antenna is smaller and more portable.

The invention provides a high-gain broadband antenna based on a resonant ring and lens structure. A main body part of the antenna comprises a bow-tie dipole broadband log-periodic antenna fed by a parallel strip-shaped microstrip line, a lens, a resonant ring, a supporting back plate and a supporting arm. And the lens structure is formed by processing a Teflon material. The top of the parallel strip-shaped microstrip line feed bow tie dipole broadband log-periodic antenna body part is composed of a microstrip line and three bow tie elements with different sizes, and the bottom of the parallel strip-shaped microstrip line feed bow tie dipole broadband log-periodic antenna body part is composed of three bow tie elements which are transited to the microstrip line and have the same size with the top but are symmetrical in direction, wherein the plane conical shape is symmetrical to a quarter circle. The SMA interface on the back is embedded in the center of the supporting backboard, the lens is located at the end-to-end of the feed source antenna, the structure of the lens is composed of a semi-sphere on the top and two cylinders with different radiuses at the bottom of the middle, and the lens is connected with the supporting backboard through the supporting arm. And the resonant ring is located at the tail end of the log-periodic antenna structure. The working frequency band of the antenna ranges from 7.18 GHz to 12.55 GHz, the gain in the frequency range ranges from 11.1 dBi to 16.0 dBi, and the gain is the highest when the frequency is 10.0 GHz. The antenna has the advantages of simple structure, low cost, wide band, high gain and the like.

The present application provides a large bandwidth signal processing device based on SDR, belonging to the field of signal technology, wherein the antenna is connected to the data processing board through an SMA interface; the data processing board is connected to the server unit through an optical fiber; the antenna is divided into two groups, one group of antennas is two identical logarithmic periodic antennas; the other group of antennas is two horn antennas with constant gain characteristics; the data processing board includes FPGA and DSP; multiple GTH high-speed interfaces are set between FPGA and DSP; FPGA has built-in ADC input and DAC output; the server unit includes a server, a network card, a CPU and a storage hard disk; the data processing board is connected to the server through an optical fiber; the server has a network card inserted; the network card is connected to the CPU through a PCLe bus; the CPU and the storage hard disk are connected through a PCLe bus. The present application directly implements RF sampling, does not require a down-conversion circuit, and greatly reduces the complexity of the device.

1. Name of the design product: Log-periodic antenna. 2. Use of the design product: As a component for transmitting or receiving electromagnetic waves in radio equipment. 3. Design key points of the design product: Lies in the shape. 4. Picture or photograph that best shows the design key points: Perspective view 1.

The invention discloses a log-periodic antenna and an ultra-wide-band dual-polarization low-profile conformal array antenna, and belongs to the technical field of design and manufacturing of ultra-wide-band antennas. The array element is formed by compounding and nesting two types of antennas including a miniaturized log-periodic antenna and a Vivaldi antenna, and the structure is multiplexed. According to the provided miniaturized log-periodic antenna, the broadband miniaturized conformal design is realized through composite loading methods such as array top loading, partial array bending, partial array loading dielectric blocks and the like. On the basis, the invention provides a design method for forming the dual-polarized antenna by nesting a Vivaldi antenna and a log-periodic antenna. A Vivaldi antenna is subjected to left and right block design, a radiation slot and an excitation slot are formed through splicing, and an assembly line of a log-periodic antenna is deployed on a left sector plate and a right sector plate of the Vivaldi antenna. According to the dual-polarization array forming mode, large-curvature conformality of the pitching surface is considered, and pitching surface wide-beam coverage and azimuth surface wide-angle scanning application can be achieved.

The application discloses a circularly polarized logarithmic-periodic antenna based on rotation of radiating oscillators, and belongs to the technical field of antenna engineering, and aims at solving the problem of how to design a circularly polarized logarithmic-periodic antenna with wide bandwidth, low profile and simple structure. The application forms corresponding circularly polarized characteristics by rotating a plurality of groups of radiating oscillators by a certain angle with parallel assembly lines as the shaft. The antenna only has a plurality of radiating oscillators which change according to the logarithmic-periodic antenna rule, and does not have a main oscillator and a sub-oscillator, so that the structure is simpler and easier to realize. Meanwhile, the circularly polarized effect is formed by rotating the radiating oscillators to a certain phase and the phase difference between the electromagnetic waves of each oscillator and the zero point of the antenna, so that the logarithmic-periodic antenna can obtain good impedance bandwidth and 3dB axial ratio bandwidth in the working frequency band.

The application relates to a retractable joint for an antenna and belongs to the technical field of antennas. The application comprises a middle support and two connecting supports, the two ends of the middle support are connected with the corresponding connecting supports through bearings; each connecting support is provided with upper and lower groups of spring connecting heads, the two upper groups of spring connecting heads opposite to each other are connected through SMA spring a, the two lower groups of spring connecting heads opposite to each other are connected through SMA spring b, and the SMA spring a and the SMA spring b are located above and below the middle support respectively. The novel shape memory alloy material is used for retraction, and the logarithmic-periodic antenna is more compact and portable.

The application discloses a log-periodic antenna linear array design method considering grating lobe suppression, and comprises the following steps: acquiring a first direction function of a main lobe direction of a uniform linear array composed of a plurality of point source antenna units changing with a feed phase; acquiring a second direction function of a main lobe direction of the uniform linear array composed of a plurality of antenna units under the influence of a beam width of the antenna units; constructing a normalized direction function of the linear array according to the first direction function and the second direction function; obtaining antenna array direction patterns under different intervals of the antenna units according to the normalized direction function by controlling the intervals between the antenna units, so as to acquire an interval range of the antenna units without grating lobes; and constructing a linear array of a plurality of linearly arranged antenna units according to the interval range. The method can solve the problem that the traditional antenna array uses the mode of changing the intervals, feed amplitudes and phases of the antenna units to control the side lobe level, thereby increasing the complexity and cost of the feed.

The present invention relates to the field of antenna technology, specifically a logarithmic periodic antenna with a telescopic device, comprising a fixed rod, a support rod and a vibrator, the support rod being mounted on the telescopic head of the fixed rod via a rotating shaft, and the support rod being able to switch to a working state perpendicular to the fixed rod or a coaxial storage state as the telescopic head is raised and lowered; the vibrator is distributed on both sides of the support rod in a logarithmic periodic arrangement, and the vibrator is composed of a plurality of nested telescopic joints, wherein a limit rod and a bottom support with a slide groove are provided in the telescopic joint, and telescopic extension is achieved by sliding cooperation between the slide groove and the limit rod, and when fully extended, the telescopic joint is rotated and fixed by an elastic self-locking mechanism; the synchronous control device also includes a side seat mounted on the support rod, a driving guide rail rotatably mounted on the side seat, and a control slide mounted through the driving guide rail, the control slide being able to be connected to and pushed by the compression head on the top of the vibrator, so as to achieve the purpose of improving the portability and deployment stability of the antenna.

The invention provides a log-periodic antenna with a non-reflection band notch absorption characteristic. The invention relates to the field of antenna design. The antenna comprises a dielectric substrate (1), a log-periodic antenna (2), a resistance loading unit (3), a tail end resistance loading structure (4) and a feed transition structure (5). The resistance loading unit (3) is composed of an oscillator (31), a resistor (32) and an assembly line (23) of a log-periodic antenna, and a single or multiple non-reflection notch bands are flexibly achieved in an energy absorption rather than reflection mode. The tail end resistance loading structure (4) is used for absorbing non-radiation low-frequency components, and therefore the full-band reflection-free characteristic is achieved. The antenna has the advantages of being simple in structure, wide in working frequency band, free of reflection in the full frequency band, capable of flexibly adjusting the notch frequency band and the like, nonlinear distortion caused by echo reflection is reduced, and the antenna has application value in a wireless communication system.

The present application relates to a multi-channel wireless signal transceiver device, including: a high-gain antenna device, an antenna switch device, a signal processing device and a controller. The high-gain antenna device includes a substrate and two or more dual-polarized inverse logarithmic periodic antennas. The dual-polarized inverse logarithmic periodic antenna includes an antenna body, an antenna vibrator, a first coaxial line and a second coaxial line. The high-gain antenna device uses dual-polarized inverse logarithmic periodic antennas to form an antenna array. The dual-polarized inverse logarithmic periodic antenna uses a cross-cross structure to achieve a dual-polarized structure of two single-polarized antenna units, which can reduce signal polarization loss and make the antenna gain excellent in both horizontal and vertical directions. The antenna is dual-polarized and inverted so that the radiation direction of the antenna is toward the ground, so that the ground can reflect all the radiated energy back, reducing the back radiation of the antenna, improving the overall gain of the antenna, and having high reliability in use.

The application relates to a metalized high-power logarithmic periodic antenna unit and array, and belongs to the technical field of microwave antennas. The antenna unit comprises a feeding coaxial probe, a feeding connection copper block, a metal feeding line and a metal logarithmic periodic dipole structure; the antenna as a whole adopts a full-metal structure without a dielectric plate, and the feeding mode adopts the metal feeding line taking air as the medium, so that the heat dissipation capacity and power capacity of the antenna are improved; the lengths of the antenna dipoles gradually increase from high to low, the dipole arms are folded inwards by 45 degrees with the set line as the central axis in the vertical plane, finally all the dipoles are located on two mutually perpendicular planes, and on the basis of the bottom several groups of dipole arms, the dipole arms are further bent by 90 degrees twice in the vertical direction to form C-shaped dipole arms; the structure effectively reduces the transverse size of the antenna unit, the coupling current between the array elements in the antenna array can be utilized to expand the antenna bandwidth to the low frequency. The application has the advantages of large antenna power capacity, small antenna unit and the like.

The utility model belongs to the technical field of antennas, and particularly discloses a miniaturized ultra-wideband conformal antenna and array, comprising an outer radiation layer, a base layer, an inner radiation layer, a support layer and a conformal mounting layer which are sequentially stacked and connected, a low-frequency oscillator of the log-periodic antenna structure is bent; and a feed cable is accommodated in the supporting layer and is connected with the log-periodic antenna structures in the outer radiation layer and the inner radiation layer. The antenna has the advantages of being small in size, wide in frequency band and capable of being well installed on the surface of an aircraft carrier in a conformal mode.

This invention discloses a deployable log-periodic antenna, relating to the field of antenna technology. It includes an antenna body, which is mounted on the lower end of a UAV. The antenna body comprises an upper connecting plate, a lower connecting plate, a fixing rod, a vertical travel electronic lock, a vertical lifting spring assembly, a pulley, a connecting wire, a joint, a connecting rod, and a first vibrator winding device. A lower connecting plate is located at the lower end of the upper connecting plate, and a fixing rod is located at the lower end of the lower connecting plate. Vertical travel electronic locks are installed between the upper and lower connecting plates and between the lower connecting plate and the fixing rod. The beneficial effects of this invention, employing a high-rigidity, highly deployable log-periodic antenna, are self-deploying, large in size, and have low areal density.

The invention provides an ultra-wideband linear polarization feed source antenna. The ultra-wideband linear polarization feed source antenna comprises a bottom plate and an antenna assembly arranged above the bottom plate, wherein the antenna assembly comprises a feed coaxial line and two log-periodic antennas, and the two log-periodic antennas are arranged on the two sides of the feed coaxial line respectively; and the two log-periodic antennas are connected in parallel through the feed coaxial line. The problems that in an existing UWB wireless communication system, the impedance coefficient and the gain value of an ultra wide band antenna are unstable, and the beam width of the H face and the beam width of the E face are greatly different can be solved.

The invention relates to a light and miniaturized common-aperture ultra-wideband antenna system based on a printed log-periodic antenna and a design method. The light and miniaturized common-aperture ultra-wideband antenna system comprises a receiving antenna module and a transmitting antenna module, the receiving antenna module comprises a substrate and antenna oscillators printed on the front side and the back side of the substrate. The base plate is of a polygonal structure composed of a bottom rectangle and a top trapezoid. The antenna oscillator adopts a parallel L-shaped design, the structure is gradually reduced from the bottom to the top, a top loading structure and a bending structure are used in a mixed mode, and the L-shaped antenna oscillators on the front side and the back side are symmetrical about the central axis of the antenna. Compared with a traditional log-periodic antenna, the designed antenna assembly is small in area, light and small in size of the antenna, and convenient to fold and carry about.

The invention provides a log-periodic antenna, and belongs to the technical field of communication. The log-periodic antenna disclosed by the invention comprises a feed assembly and N radiation structures, each radiation structure is electrically connected with the feed assembly, and the number of connection nodes is M; n > = 3, M > = 3; wherein the distance between the M connecting nodes meets the periodic change.

The invention discloses a log-periodic antenna interference hardware suppression method based on a dynamic adjustment scale factor, a storage medium and equipment. The method comprises the following steps: S1, obtaining a feasible region of the scale factor and an interval factor by using a gain and an isoline between the scale factor and the interval factor; s2, in the feasible region, taking the minimization of the set line length as an objective function, and solving an optimal combination of a scaling factor and an interval factor; s3, calculating the length of any oscillator, the frequency corresponding to the oscillator and the bandwidth controlled by the oscillator; s4, introducing a positioning oscillator, and positioning the oscillator corresponding to the target suppression frequency band; and S5, dynamically adjusting a scaling factor according to a proportional relation between the bandwidth controlled by the positioning oscillator and the bandwidth of the target suppression frequency band, and removing the corresponding oscillator according to the local optimization value of the target suppression frequency band. The core parameters of the antenna are determined through gain isoline constraint and assembly line length minimization, and fine suppression of an interference frequency band is realized in combination with dynamic scale factor adjustment and an adjacent oscillator fine tuning technology.

The invention provides a simulation test method and system for radiation sensitivity of an electric field. The method comprises the following steps: acquiring target field intensity of an interference source and simulation parameters of equipment to be tested; constructing a log-periodic antenna model according to the target field intensity, wherein the log-periodic antenna model is a simulation model of a non-frequency-varying broadband antenna; constructing an equipment simulation model of the to-be-tested equipment according to the simulation parameters; importing the log-periodic antenna model and the equipment simulation model into a preset simulation test environment; and in the simulation test environment, performing an electric field radiation sensitivity simulation test on the equipment simulation model based on a preset interference mode. According to the application, the antenna model is established as an interference source to apply interference to the tested equipment, so that the simulation test of the electric field radiation sensitivity is carried out, and the simulation test precision and the simulation test comprehensiveness of the electric field radiation sensitivity are improved.

The utility model relates to the log-periodic antenna field, and discloses a foldable log-periodic antenna comprising a vertical rod, the inner bottom end of the vertical rod is rotatably connected with a threaded rod, the bottom end of the threaded rod is fixedly connected with a bevel gear 1, and the outer part of the threaded rod is in threaded connection with a sleeve rod. Limiting blocks are fixedly connected to the left side and the right side of the exterior of the sleeve rod, supporting rods are rotatably connected to the exteriors of the limiting blocks, a second bevel gear is rotatably connected to the bottom end of the interior of the vertical rod, a rotating rod is fixedly connected to the exterior of the second bevel gear, and a mounting block is fixedly connected to the bottom of the vertical rod. According to the log-periodic antenna, through mutual cooperation of the vertical rods, the threaded rods, the limiting blocks and other structures, folding of the log-periodic antenna is achieved, the log-periodic antenna can be folded when not used, the size and the size of the antenna are reduced, carrying and storage are convenient, and meanwhile the shape and the size are adjusted according to needs so that the log-periodic antenna can adapt to different application scenes and working frequencies.

The invention discloses a miniaturized indoor log-periodic antenna, and relates to the technical field of log-periodic antennae, the miniaturized indoor log-periodic antenna comprises a first periodic antenna, a second periodic antenna and an oscillator arm group, the oscillator arm group comprises a first pair of oscillator arms, a second pair of oscillator arms, a third pair of oscillator arms and a fourth pair of oscillator arms, one of each pair of oscillator arms in the first pair of oscillator arms, the second pair of oscillator arms, the third pair of oscillator arms and the fourth pair of oscillator arms is connected with the first periodic antenna, the other one is connected with the second periodic antenna, and each oscillator arm is correspondingly connected with a loading piece. Under the index requirements of the same gain, the same working frequency band and the like, the transverse size and the longitudinal size can be reduced, the actual installation of the antenna is facilitated, and the production cost is reduced.

The utility model provides a high-gain antenna, and belongs to the technical field of antennas. The high-gain antenna comprises a reflecting plate; the two log-periodic antennas are symmetrically arranged relative to the middle vertical plane of the reflecting plate, each log-periodic antenna is provided with a plurality of oscillators, and each log-periodic antenna is provided with a first end provided with the shortest oscillator and a second end provided with the longest oscillator; the second end of each log-periodic antenna is connected to the reflecting plate, and the distance between the first ends of the two log-periodic antennas is smaller than the distance between the second ends of the two log-periodic antennas; the power divider is provided with a first input end and two first output ends, and the two first output ends are respectively connected with the two log-periodic antennas; and the connector is provided with a second input end and a second output end, and the second output end is connected with the first input end. The antenna provided by the utility model has high gain and realizes the consistency of beam width.

The utility model provides a double-frequency directional log-periodic antenna and unmanned aerial vehicle reconnaissance equipment. The provided dual-frequency directional log-periodic antenna comprises a coaxial line, one end of the coaxial line is provided with a connector, and the other end of the coaxial line is provided with a feed part; the oscillator unit comprises a first main beam and a second main beam which extend along the length direction of the coaxial line; the first main beam is located between the coaxial line and the second main beam, and the first main beam and the second main beam are respectively connected with the feed part; the first main beam is connected with a plurality of first antenna oscillators, and the second main beam is connected with a plurality of second antenna oscillators; the plurality of first antenna oscillators are arranged at intervals along the length direction of the coaxial line; the first antenna oscillator and the second antenna oscillator are symmetrically arranged about the coaxial line. The working frequency of the dual-frequency directional log-periodic antenna provided by the utility model is 1160MHz-1300MHz and 1559MHz-1610MHz, and the dual-frequency directional log-periodic antenna is installed on unmanned aerial vehicle reconnaissance equipment and can ensure that the unmanned aerial vehicle reconnaissance equipment accurately and timely discovers unmanned aerial vehicle signals.

The log-periodic antenna with the supporting structure comprises a metal seat, an antenna assembly and the supporting structure, the antenna assembly is provided with radiators and a coaxial cable, the metal seat is provided with a metal bottom plate, one end of each radiator is arranged on two sides of the metal bottom plate and fixedly connected with the metal bottom plate, and the other end of each radiator is fixedly connected with the supporting structure. The coaxial cable penetrates through the metal base to be connected with the other end of the radiator, the supporting structure is arranged in the middle of the radiator and connected with the radiator in a clamping fit mode, and the outer side of the supporting structure is further connected with the coaxial cable in a clamping mode. According to the utility model, the supporting structure is arranged in the radiator in a clamping manner, and the clamping design of the supporting structure replaces a traditional bunching belt, so that the bunching belt does not need to be tensioned manually, and the influence of manual operation errors on the fastening effect is eliminated; the log-periodic antenna with the supporting structure can prevent the spacer block from slipping off during vibration, temperature change or long-term use, so as to solve the problems proposed in the background technology.

The utility model relates to the technical field of antennas, in particular to a broadband log-periodic antenna, which comprises two main rods and a plurality of fixing frames used for fixing the two main rods. The bottom ends of the two main rods are jointly provided with a fixing base and an angle adjusting structure, and the angle adjusting structure is used for adjusting the angles between the two main rods and the fixing base. The top ends of the two main rods are jointly provided with a feed structure, and the feed structure is covered with a waterproof structure. A radio frequency connector is installed at the bottom end of one main rod, one main rod is hollow and is provided with a cable in a penetrating mode, one end of the cable is connected to the feed structure, and the other end of the cable is connected to the radio frequency connector; a plurality of groups of vibrator pairs are sequentially mounted on the outer sides of the two main rods at intervals in the length direction, and the lengths of the plurality of groups of vibrator pairs are gradually increased from the bottom ends to the top ends of the main rods. According to the utility model, the technical problems of poor adjustability of the mounting angle and insufficient structural durability of the conventional antenna are solved, and the antenna can be ensured to continuously and efficiently operate in various extreme environments.