16 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 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.

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 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 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 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 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.

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 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.