(57) Abstract:The invention relates to antenna technique and can be used for transmitting objects, in particular on television stations. The technical result of the invention is to increase the gain and decrease the lateral radiation turnstile antenna without changing its pattern in the horizontal plane. The antenna contains two perpendicular active vibrator length of 0.5, fed by a current with a phase shift equal to 90oand four passive vibrator length (0,51-0,53) each. Passive vibrators are arranged in parallel above and below each active vibrator on the distance (0.5 to 0.6). With this arrangement, the vibrators according to the numerical calculations confirmed the experimental data, the antenna gain in the direction of maximum radiation increases by 3-4 dB relative to the prototype, and the level of the lateral radiation in the direction of up and down is reduced by at least 5 dB. 3 Il. The invention relates to antenna technique and can be used for transmitting objects, in particular on television stations.Known turnstile antenna with Paradise entity is a turnstile antenna [X. Meinke, F. Gundlah. , Radio engineering Handbook. So 1. - M.: State energy publishing, I960. 416; Markov, I., Sazonov, D. M. , Antenna. - M.: Energy, 1975. 528], which consists of two horizontal half-wave dipoles perpendicular to each other, fed by currents with a phase shift equal to 90o.The disadvantage of this antenna is a low gain and a high level of lateral radiation, due to its design. Under lateral radiation refers to radiation in directions other than horizontal.The aim of the invention is to increase the gain and decrease the lateral radiation turnstile antenna without changing its pattern in the horizontal plane.To achieve this objective, it is suggested over and under each vibrator antenna prototype at a distance (0.5 to 0.6), where is the working wavelength, install passive vibrators length (0,51-0,53) (Fig.1).Comparative analysis with the prototype shows that the claimed antenna differs in that it contains additional passive vibrators located above. Thus, the claimed device acoefficient gain and low side radiation. This allows to make a conclusion on the conformity of the proposed technical solution the criterion of "inventive step".In Fig.1 shows the proposed antenna. In Fig.2 presents the calculated and experimental radiation pattern of the antenna in the vertical plane (the plane xoz or yoz) d = 0,5. In Fig.3 shows the calculated radiation pattern in the horizontal plane (the plane HOU) antenna prototype and the proposed antenna with the same value of d. Pattern coincide with graphic accuracy.The antenna contains two perpendicular active vibrator length of 0.5, fed by a current with a phase shift equal to 90oand four passive vibrator length (0,51-0,53) each. Passive vibrators are arranged in parallel above and below each active vibrator on the distance (0.5 to 0.6) from them. With this arrangement, the vibrators according to the numerical calculations confirmed the experimental data, the antenna gain in the direction of maximum radiation increases by 3-4 dB relative to the antenna prototype, and the level of the lateral radiation in the direction of "up" and "down" decreases by at least 5 dB.The device operates as follows. When wosb is that along with the currents on the active vibrators also radiate into the surrounding space. When the selected geometric dimensions, the addition of tension fields from each vibrator is such that in the horizontal plane fields are added in ratios close to in-phase and in the directions "up" and "down" largely offset each other.The effectiveness of the invention is that by using passive elements is increased gain and reduced lateral radiation turnstile antenna. The proposed antenna can be widely used in network TV repeaters. Turnstile antenna for transmitting objects with horizontal polarization, containing two perpendicular active vibrator and characterized in that to increase the gain and decrease the lateral radiation above and below the active half-wave vibrators and parallel them at a distance (0.5 to 0.6) are four passive vibrator length (0,51-0,53), where is the working wavelength.
FIELD: circularly polarized antennas.
SUBSTANCE: proposed circularly polarized multifrequency antenna has reflector, first pair of crossed dipoles operating at first resonant frequency, and second pair of crossed dipoles operating at second resonant frequency. First and second pairs of dipoles are symmetrically disposed on one side of reflector and designed for excitation with equal power at relative phase shift through 0, 90, 180, and 270 deg.
EFFECT: ability of ensuring multifrequency communications with omnidirectional pattern at desired angle of inclination.
22 cl, 4 dwg
SUBSTANCE: invention refers to antenna engineering and can be used for production, at manufacturing plants, of dipole, phased or digital arrays (A) for signal reception/transfer within VHF range with various polarisation within wide single-beam scanning sector, that is in production period and cost, less by a factor of ten than production of conventional large-dimensioned arrays. The invention consists in that design of ready-to-operate array includes carrying submodule trusses whereon are fixed and galvanic ally coupled in either square or orthogonal curtain the identical prefabricated antenna modules representing vibrator arrays of coherent parameters, with orthogonal arms (cross-vibrators) inclined at an angle 45° to screen plane of single standard dimension-type, with arm length of horizontally polarised vibrator Lhor=0.463λo and vertically polarised vibrator Lvert. = 0.452λo, their height being equal h=0.226λo over conducting screen. Cross-vibrators are placed in array curtain along triangular mesh in the form of isosceles triangles with angularly placed vibrators, coordinate distances between their columns being dx=0.45λo and between their lines dy=0.32λo. Array is calibrated by experiment-calculated method with scattering matrix evaluation and VSWR calculation within its small fragment from 37 cross-vibrators of adjustable dimensions for fine adjustment until optimum dimension-type of required VSWR is attained. To provide ready-to-assembly array in-site in short terms, fit-up and adjustment of array curtain is carried out at a manufacturing plant.
EFFECT: extended scanning sector with matching of completely built-up array within whole scan sector up to ±60° at considerably reduced of time of array calibration and its setting into operation.
5 cl, 4 dwg
FIELD: physics, radio.
SUBSTANCE: invention is related to antenna device, which comprises facility for provision of approximation of electric circuit of DC, which is arranged for provision of the first practically toroidal directional pattern, at that antenna device comprises the first and second electric dipoles, which are installed substantially orthogonally to each other and are arranged to provide for the second and third substantially toroidal directional patterns, every of which is substantially orthogonal to the other one and to the first substantially toroidal directional pattern. Facility for approximation of DC electric circuit comprises at least two parts of current tracks, in which current (I1, I2, I3, I4) may be supplied to every of mentioned parts, so that currents (I1, I2, I3, I4) in each of mentioned parts are practically cophased to each other.
EFFECT: development of antenna device that comprises facility for provision of DC electric circuit approximation.
7 cl, 15 dwg
FIELD: radio engineering.
SUBSTANCE: invention may be used to develop double-frequency, bipolar phased antenna arrays of wide-angle scanning for reception/transfer of signals in metre and decimetre range of frequencies of various polarisation in wide spectrum of angles. Design of this combined antenna consists of modules containing antenna arrays from cross-vibrators with various dimension types for metre and decimetre ranges arranged in triangular grids calculated to maintain wide-angle capacity of beam swinging, with establishment of distances between columns of cross-vibrators of each range equal to dx(1.2)=0.45λ0(1.2) and between lines dy(1.2)=0.32λ0(1.2), where λ0(1.2) - average length of wave in working range of metre or decimetre range antenna accordingly, besides, areas of decimetre range cross-vibrators location do not comply with areas of metre range cross-vibrators installation. Moreover, low-pass filter is inbuilt into design of metre range antenna cross-vibrator. Parametres of filter are selected so that it transmits frequencies of metre range antenna working range practically without losses and suppresses frequencies outside working range and on higher harmonics. Filter is inbuilt into feeding stand of cross-vibrator and represents coaxial line with central conductor of alternating diametre. Configuration of central conductor is determined by required characteristics of the filter. As a result, cross-vibrator of metre range represents united design with filter.
EFFECT: minimisation of HF-range radiators effect at DN and matching in LF-range, which provides for noise-immunity of metre range antenna, wide-angle capacity of scanning and reduced time for tuning for coordination in the whole coverage sector.
2 cl, 14 dwg
FIELD: radio engineering, communication.
SUBSTANCE: multi-pole antenna, having a dielectric substrate on which four identical half-wave dipoles are arranged symmetrically on a circle, each made in form of a resonance section of a periodic microstrip line with the width at the centre which is equal to a quarter of the average wavelength and linearly narrowing towards the peripheral region.
EFFECT: improved cross-polarisation properties while achieving rotating circular or elliptical polarisation and a uniform beam pattern in a wide frequency band, and overall dimensions of the antenna which are considerably smaller than the maximum operating wavelength.
6 cl, 6 dwg
FIELD: to antenna engineering.
SUBSTANCE: for this purpose, an electromagnetic dipole antenna comprises an antenna radiating element and the “ground” metal, wherein the antenna radiation unit mainly comprises perpendicular electric vibrators and horizontal magnetic vibrators, wherein perpendicular electric vibrators and horizontal magnetic vibrators together form an electromagnetic coupling structure.
EFFECT: advantages of small size, low profile, in order to facilitate the erection of the antenna.
6 cl, 10 dwg
FIELD: radio engineering, communication.
SUBSTANCE: antenna is designed so, that the orthogonal vibrators are placed on the frame in the form of the thin-walled dielectric hemisphere, mounted on the screen. The antenna is consistent by means of the hemisphere radius and the slit cut in each of the vibrators arms position selection. The vibrator direction pattern has the same half power width of E and N-planes.
EFFECT: provision of the circular polarisation with the ellipticity coefficient more than 0,85 in the solid angle of 100 degrees.
2 cl, 4 dwg
FIELD: radio engineering, communication.
SUBSTANCE: two-polarized dipole antenna comprises a radiator of two orthogonal dipoles located in a plane parallel to the reflector. Each arm of the dipoles is formed by a pair of conductors symmetrically bent relative to the longitudinal axis of the dipole, closed around each other at the feed point with one end and having a gap between the second ends which forms a rupture of the arm contour. The initial portion of each conductor adjacent to the feed point is rectilinear and parallel to the initial portion of the adjacent second dipole conductor and to the end portion of the second conductor portion of the pair adjacent to the gap. The essence of the solution lies in the fact that the initial portions of conductors are made with a length L = (0.07-0.15)⋅λmid, where λmid is the wavelength corresponding to the midfrequency of the frequency range, wherein the initial and end portions of each conductor are interconnected by an intermediate portion. The intermediate portion can be made rectilinear or in an arc.
EFFECT: improved matching of the dipoles with the supply cable and expanded operating frequency band.
5 cl, 19 dwg