28 results about "Log-periodic antenna" patented technology

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 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 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 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.

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 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 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 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.

The application discloses a microstrip logarithmic periodic antenna and a radio transceiver device, and the antenna comprises a radiation oscillator, a dielectric substrate, a metal ring, a ring carrier and a feed port; the radiation oscillator is arranged in a logarithmic periodic antenna array and is located on the dielectric substrate; the metal ring corresponds to the logarithmic periodic radiation oscillator one by one; the metal ring is discretely distributed on the surface of the ring carrier; and the metal ring and the radiation oscillator are in position correspondence and have the same number. By adding a plurality of conical ring metals outside the traditional logarithmic periodic antenna, the gain is increased, the sidelobe is reduced, and the logarithmic periodic antenna is better than the traditional logarithmic periodic antenna, and has many advantages such as high gain, high aperture efficiency, low sidelobe and miniaturization.

The utility model discloses a high-performance log-periodic antenna, which relates to the field of electronic communication and comprises a radiation oscillator. The radiation assemblies are symmetrically arranged on the two sides of the radiation oscillator, each radiation assembly comprises multiple groups of radiation arm units which are arranged at intervals in the axial direction of the radiation oscillator, and each radiation arm comprises a first radiation arm which is vertically connected with the radiation oscillator and a second radiation arm which is located at the far end of the first radiation arm and is bent towards the radiation end of the radiation oscillator; the radiation end of the radiation oscillator is provided with an array coupling end. By designing the bent second radiation arm on the radiation oscillator, the distortion of an antenna radiation pattern caused by a conformal equipment metal shell plate is greatly reduced, and meanwhile, the second radiation arm is beneficial to improving the equivalent radiation electric size of the antenna, the low-frequency working bandwidth of the antenna can be expanded, and the size miniaturization of the antenna is realized.

The application discloses a distance adjuster and a log-periodic antenna, comprising two positioning adjusters, each of which comprises a fixed part, an adjusting rod provided with a plurality of second positioning structures at two ends of the fixed part in a third direction and a positioning part provided with a through hole, a first positioning structure being arranged on an inner surface of the through hole away from the fixed part, the two positioning adjusters being used in a relative rotation of 180 degrees, the adjusting rod of one of the two positioning adjusters being arranged in the through hole of the other and being movable along the second direction so as to insert any one of the second positioning structures on the adjusting rod and the corresponding first positioning structure together. According to the distance adjuster, the structure is simple and convenient to use, the distance between the two fixed parts can be fixed, the gap between the two vibrator arrays is reliably positioned, the distance between the two fixed parts can be adjusted, the gap between the two vibrator arrays is adjustable, and the assembly efficiency of the log-periodic antenna is improved.

This invention discloses a miniaturized log-periodic antenna and its assembly and design methods, belonging to the field of communication antenna technology. The antenna includes a dielectric substrate, a semi-steel cable, an adapter plate, and a copper layer; the copper layer is disposed on the front and back sides of the dielectric substrate; an adapter plate is disposed at one end of the dielectric substrate; the outer shell of the semi-steel cable is welded to the copper layer at the center line of the back side of the dielectric substrate, and the inner core of the semi-steel cable is bent upwards through the side of the dielectric substrate without the adapter plate and then welded to the copper layer on the front side of the dielectric substrate; the antenna operates in the frequency band of 150MHz–400MHz, with a VSWR ≤2, and uses linear polarization. This invention addresses the performance shortcomings of traditional antennas in this frequency band by optimizing the structure of the vibrator and improving the feeding method, enabling it to cover the target frequency band while meeting the lightweight and miniaturized usage requirements of different scenarios.

TITLE: Log-periodic Antenna and Associated Vehicle The present invention relates to a log-periodic antenna (10) comprising a material (12) extending in a plane along an elongation axis (E), the material (12) carrying successive radiating elements (14) arranged along the elongation axis (E), the radiating elements (14) extending along an elevation axis (Z), wherein, over at least a portion of the material (12), the ratio of the distance separating a radiating element (14) from an immediately successive radiating element (14) to the distance separating the radiating element (14) from the immediately preceding radiating element (14) is constant, characterized in that at least a plurality of successive radiating elements (14) are arranged alternately on either side of a plane defined by the elongation axis (E) and the axis elevation (Z) and at a non-zero distance from this plane. Figure for the abbreviation: Figure 2

The application belongs to the technical field of antennas, and discloses a super wideband logarithmic periodic antenna based on tight coupling, which comprises a low-frequency tight coupling dipole unit part, a high-frequency logarithmic periodic antenna part and a baffle part for adjusting the low-frequency radiation pattern. The application can also be used as a super wideband detection antenna. When all the units of the array are excited, a signal with an end-fire direction of more than 60 times frequency can be generated, and a directional end-fire pattern can be generated, so that the signal detection and direction finding functions are realized. In addition, the antenna can also be used as a receiving antenna for receiving omnidirectional space incoming wave signals. The antenna array is arranged in a circular shape, and a plurality of the antennas are arranged in a circle, so that wideband omnidirectional radiation is realized.

The application relates to a folding joint for an antenna and belongs to the technical field of antennas. The application comprises seat plates, folding rods and intermediate support seats; the seat plates and the folding rods are both provided with two, and the seat plates and the folding rods are one-to-one corresponding, one end of the folding rod is connected to one side of the corresponding seat plate; the two ends of the intermediate support seat are respectively hinged to two folding rods, and the hinged positions of the folding rods are located at the intersection of a folding four-rod and a folding three-rod; SMA memory alloy springs and SMA memory alloy plates connected with the seat plates are further arranged between the two seat plates; the two ends of the SMA memory alloy spring are respectively connected to the corresponding seat plate, and the two ends of the SMA memory alloy plate are respectively hinged to the two seat plates. The SMA memory alloy spring and the SMA memory alloy plate are located below the intermediate support seat. The application adopts a novel shape memory alloy material to be foldable and expandable, and can make a logarithmic-periodic antenna more compact and portable.

The application relates to a light and small-sized common-aperture ultra-wideband antenna system based on a printed logarithmic-periodic antenna and a design method, which comprises a receiving antenna module and a transmitting antenna module; the receiving antenna module comprises a substrate and antenna elements printed on the front and back surfaces of the substrate; the substrate adopts a polygonal structure composed of a bottom rectangle and a top trapezoid; the antenna elements adopt a parallel L-shaped design, gradually become smaller from the bottom to the top, and are loaded with a mixed structure of a top end and a bending structure; the L-shaped antenna elements on the front and back surfaces are symmetrical about the central axis of the antenna. The antenna assembly designed by the application is smaller than a traditional logarithmic-periodic antenna, realizes light and small-sized antenna, and is convenient for folding, stacking and carrying.

The application discloses a kind of dual-band, ultra-wideband, multi-beam, dual-polarized positive feed reflector antenna, it is related to antenna technical technical field, including positive feed single reflector and dual-band feed source array, dual-band feed source array is longitudinally defocused to positive feed single reflector direction, and the main beam of each feed source on feed source array is directed to positive feed single reflector direction;Including high-frequency band feed source subarray and low-frequency band feed source subarray, each feed source in high-frequency band feed source subarray and low-frequency band feed source subarray is focused into narrow beam by positive feed single reflector, and each feed source is polarized into dual circular polarization after focusing by positive feed single reflector;Variable opening angle logarithmic periodic antenna is used in high-frequency band feed source subarray and low-frequency band feed source subarray, with the advantages of small size, low profile, high gain etc.;Wherein, the multi-beam antenna formed, under the same coverage area, single beam coverage area is large, and the number of required beams is less, and the coverage difference between different frequencies of each subarray is small.

Sinusoidal and log-periodic antennas are broadband frequency-independent antennas that advantageously provide similar beamwidths at all operating frequencies. While they can be planar, they have improved directional characteristics when formed on a conical or similar surface. Fabrication of these three-dimensional antenna structures is challenging. Typically, an antenna laminate is wrapped around a frustum-shaped former. Any alignment error can result in a significant reduction in the antenna's high-frequency performance. Additionally, wrapping techniques are limited to frustum-shaped and truncated pyramidal formers. A solution is achieved by providing a dielectric sheet formed as a single, integral part that defines a central common area and radially extending arms. The flexible dielectric sheet supports a metal patterned layer that defines, on each arm, a conductive antenna element that is each fed by a conductive trace provided by a portion of the metal patterned layer formed on the common area. Each arm can be bent at its junction with the common area to fit the shape of the former without affecting the alignment between the arms.

The application relates to the technical field of microwave antennas, in particular to a small-sized wideband polarization antenna based on a single-ridge horn and a log-periodic antenna, which is convenient to process, stable and reliable, small in size, and characterized in that the small-sized wideband polarization antenna comprises a dual-polarization diversity mode of vertical polarization and horizontal polarization, electromagnetic fields of two polarization ports are orthogonal in a far radiation zone, polarization port one adopts a small-sized printed log-periodic antenna with a locally buried dielectric, and polarization port two adopts a single-ridge ultra-wideband horn antenna; compared with the prior art, the scheme is simple in design, convenient in processing and assembly, low in cost, beneficial to engineering application, suitable for application in a dual-polarization radar system, an electronic countermeasure system and a wireless communication system, and has relatively important application value.

The invention discloses a dual-band, ultra-wideband, multi-beam and dual-polarization positive feed-forward reflector antenna, and relates to the technical field of antenna technology, the dual-band, ultra-wideband, multi-beam and dual-polarization positive feed-forward reflector antenna comprises a positive feed-forward single reflector and a dual-band feed source array, the dual-band feed source array is longitudinally offset in focus towards the direction of the positive feed-forward single reflector, and the main beam of each feed source on the feed source array points to the direction of the positive feed-forward single reflector; comprising a high-frequency-band feed source sub-array and a low-frequency-band feed source sub-array, each feed source in the high-frequency-band feed source sub-array and the low-frequency-band feed source sub-array is focused into a narrow wave beam through a positive feed-forward single reflecting surface, and each feed source is focused through the positive feed-forward single reflecting surface and then polarized into dual circular polarization; the high-frequency-band feed source subarray and the low-frequency-band feed source subarray both adopt variable-field-angle log-periodic antennas, and have the advantages of small size, low profile, high gain and the like. According to the formed multi-beam antenna, under the same coverage area, the coverage area of a single beam is large, the number of needed beams is small, and the coverage difference between different frequencies of each sub-array is small.

The invention provides a log-periodic antenna and equipment based on a double-helix transmission loading rectangular patch. The log-periodic antenna comprises a dielectric substrate; a pair of metalized through holes are formed in the dielectric substrate in a penetrating manner, and a differential feed port is formed in the bottom of each metalized through hole; a metal grounding layer is arranged on the bottom surface of the dielectric substrate; the top surface of the dielectric substrate is provided with a pair of spiral transmission lines, one end of each spiral transmission line is connected with the top of the corresponding metalized through hole, and log-periodic rectangular patches are distributed on the spiral transmission lines. According to the invention, the 90-degree phase difference is naturally generated in the broadband by adopting the form of the double-spiral transmission line and utilizing the spiral phase delay characteristic, and the axial ratio bandwidth can be improved by combining the radiation optimization of the log-periodic rectangular patch.

The invention discloses a split type log-periodic antenna, which comprises a connecting seat, a main rod, a plurality of oscillator mounting seats, a plurality of oscillators and a coaxial cable, and is characterized in that the connecting seat is provided with a connecting hole; the main rod is mounted on the connecting seat, and a first mounting cavity is formed in the main rod; the plurality of vibrator mounting seats are mounted on the main rod at equal intervals according to a logarithmic periodic rule; the vibrators are detachably mounted on the corresponding vibrator mounting seats; the coaxial cable penetrates through the connecting base to be installed in the first installation cavity, the coaxial cable is connected with a radio frequency connector, the radio frequency connector is suitable for being connected with external radio frequency equipment, and a stepped phase delay network is formed between a feeding point of the radio frequency connector and all the oscillators through the coaxial cable. The structure can be optimized through detachable modular design, the packaging and transportation cost is reduced, and meanwhile the broadband performance is kept stable.

The application discloses a log-periodic antenna design method considering sidelobe level, and comprises the following steps: obtaining a normalized direction function of a main lobe direction of a uniform linear array composed of a plurality of antenna units, which is influenced by a beam scanning width of the uniform linear array; obtaining a corresponding relationship between a maximum sidelobe level and the beam scanning width, and obtaining a beam width factor corresponding to a target sidelobe level according to the corresponding relationship; determining a proportional factor and a spacing factor of a corresponding antenna unit according to the beam width factor; determining an antenna array gain, determining a number of the antenna units in the uniform linear array according to the antenna array gain; determining a lowest working frequency of the uniform linear array according to the normalized direction function, and calculating a dipole parameter of the corresponding antenna unit to complete the design of the linear array. The method can solve the problem that the traditional antenna array controls the sidelobe level by changing the spacing, the feeding amplitude and the phase of the antenna unit, thereby increasing the complexity and the cost of the feeding.

The application discloses a portable soft-vibrator logarithmic-periodic antenna and relates to the technical field of non-frequency-variable antennas. The portable soft-vibrator logarithmic-periodic antenna comprises an antenna main rod, a folding support rod and a winding mechanism, the folding support rod is hinged to the antenna main rod, the folding support rod and the antenna main rod are provided with a side hanging line at the end away from the hinge, the winding mechanism is connected to the folding support rod, the winding mechanism is provided with a tightening rope connected to the folding support rod, the tightening rope and the side hanging line apply forces rotating in different directions to the folding support rod, and the antenna main rod is provided with a soft vibrator connected to the side hanging line. The portable soft-vibrator logarithmic-periodic antenna effectively reduces the volume of the antenna in a non-working state through the folding design of the antenna structure, significantly improves the convenience of transportation and installation, and has the beneficial effects of being foldable and convenient to transport and install.