147 results about "Dipole array" patented technology

An compact and rugged antenna system particularly suited to direction finding includes a plurality of antenna arrays for receiving respective frequency bands and colocated on a mast with separation between antenna arrays along the mast. The mast includes a coil wound of an insulator and functioning as a loaded inductor to shift the mast resonance out of the frequency band of the antenna system. A VHF dipole array having elements shaped to reduce scattering to UHF and SHF arrays is supported on movable arms which allow retraction that reduces height and provides mechanical protection to one or more other arrays as well as damping against vibration by contacting the mast with shaped portions of the dipole elements. The bowtie elements of the UHF array are angled at a central region to optimize array diameter at low UHF frequencies. A finned RF electronics housing is preferably provided which reduces solar loading and dissipates heat from antenna electronics. Asymmetrically keyed fittings are provided to permit accurate antenna system, array and element positioning and replaceable components and wiring, both internally and externally of the housing, is held in position to allow field repairs without recalibration.

An active antenna, a base station, a method for refreshing the amplitude and phase, and a signal processing method are disclosed to simplify the structure of a phase shifter and guarantee the reliability of the phase shifter. The active antenna or the base station includes an antenna dipole array, a transceiver array, a digital processing unit (DPU), and a transceiving calibration unit. During signal reception, the transceiver demodulates a radio frequency (RF) signal of the antenna dipole into an IQ analog signal, and outputs the IQ analog signal to the DPU; the DPU converts the demodulated IQ analog signal into an IQ digital signal, and performs digital beam forming (DBF) on the IQ digital signal according to the transceiving calibration unit; during signal transmission, the transceiver modulates the IQ analog signal of the DPU into an RF signal, and outputs the RF signal to the antenna dipole; the DPU converts a signal of a base band unit (BBU) into an IQ digital signal in serial/parallel (S/P) mode, and performs DBF on the IQ digital signal according to the transceiving calibration unit.

A multi-element, H plane, phase, dipole array antenna has a high gain over a wide angle in azimuth and over a controlled sector in elevation. Two printed wiring boards feed and physically support the dipole antenna elements. The phase and spacing of the dipole elements establish the radiation elevation angle, and a planar metallic reflector, spaced on the order of a half wavelength of the RF signal from the dipole array, interacts with the dipole-element pattern, to provide the wide angle azimuth gain.

A phased array antenna includes a substrate that is segmented into a plurality of array tiles. An array of dipole antenna elements is formed on the substrate with each dipole antenna element positioned on a respective one of the array tiles. Each dipole antenna element includes a medial feed portion and a pair of legs extending outwardly therefrom. Adjacent legs of adjacent dipole antenna elements include respective spaced apart end portions forming a gap between the respective end portions and defined by separate tiles. A capacitor coupler is positioned at each respective spaced apart end portion of adjacent legs and bridging a gap for capacitive coupling respective spaced apart end portions of respective adjacent dipole antenna elements together.

A dipole antenna array comprising a ground plane, at least one dipole antenna including an active antenna element and a grounded antenna element, at least one reflector and integrated electronics, wherein the active antenna element is isolated from the ground plane and extends substantially perpendicular to the ground plane and the grounded antenna element extends in a direction substantially opposite to the active antenna element, the ground plane is contained within the area bounded by the reflector; the integrated electronics include at least one of a signal down converter and a signal up-converter, and at least some of the integrated electronics are contained in a space defined by at least one of a portion of the ground plane and a portion of the reflector.

The invention discloses a dual-polarization tight coupling dipole array antenna. An antenna unit is formed by orthogonally combining two single-polarization dipole units of a same type. Each single-polarization dipole unit is formed by an interdigital dipole, feed line Balun, metal floor and a wide angle matching layer. The feed line Balun is formed by three portions: a coplanar strip line portion connected to the dipole, a gradual change triangle microstrip transmission line whose feed end is connected to a coaxial line and an intermediate transition portion. In the invention, based on the dipole array antenna, a mutual-coupling effect among array elements is used to expand a frequency bandwidth, and the wide angle matching layer is introduced to improve a wide angle scanning characteristic of an antenna array. A common mode resonance caused by a common mode current existing at a specific frequency point under coplanar strip line feed is processed. Through arranging a 50ohm resistor between the metal floor and gradual change ground, the common mode current is shunted so that the common mode resonance disappears, simultaneously a work bandwidth of an antenna is expanded and performance in a whole work bandwidth can be well increased.

The invention is used in the field of oil field logging technology, mainly resolving the defect of existent earth stress detection technology which has not any one non-destructive examination method. Said invention is characterized by that it includes the following steps: making cross dipole array acoustic log data undergo the process of angle rotation treatment, then obtaining two main time sequences, on said basis extracting flexural wave dispersion curves of two principal directions, utilizing data of n frequency points on the flexural wave dispersion curves of two principal polarization directions to create n equalities according to two formulae, in which said formulae can be obtained by inversion of well mode wave acoustic elastic equation, in which n is greater than or equal to 6, and atilizing resolution of sain n equalities so as to can obtain maximum main stress SH and minimum main stress Sh of formation.

An improved eleven antenna is disclosed, comprising a conducting body acting as a ground plane; and at least one pair of log-periodic dipole arrays arranged above the ground plane, the dipoles of said pair of log-periodic arrays of dipoles forming dipole pairs of parallel and oppositely located dipoles of the same dimensions and arranged in such a way that the geometrical centres of each of said dipole pairs and their images in the ground plane are coinciding,wherein each dipole is a folded dipole comprising two or more parallel or nearly parallel conducting strips that are connected at one or more points or over an extended part of the conducting strips. Further, a plurality of the folded dipoles, within each of said log-periodic dipole array, being closer to said geometrical centre are extending in a first plane, and wherein the remaining at least one folded dipole being located most far away from said geometrical centre is arranged to extend in at least one additional plane, said additional plane(s) forming an angle relative to said first plane. Hereby,a more compact antenna is achieved.

Provided are complex elements for an antenna of a radio frequency repeater and a dipole array circular polarization antenna using the same. The complex elements for the antenna of the RF repeater include: a plurality of radiation members which are separated from one another by a predetermined angular distance and has a radiation portion and a leg portion, the radiation portion comprising a pair of parallel portions, which are separated from each other in a vertical direction and are disposed to be parallel to each other, and a connection portion, which is disposed to be perpendicular to the pair of parallel portions and connects ends of each of the pair of parallel portions, and the leg portion extending from the radiation portion; and a plurality of feeding members, each of the feeding members connected to each of the radiation members that face each other, among the plurality of radiation members.

The invention discloses a planar end-fire circular polarization antenna employing a substrate integrated waveguide. The planar end-fire circular polarization antenna comprises a dielectric substrate, the substrate integrated waveguide, a dipole array and a feed waveguide connected to the dielectric substrate, wherein the substrate integrated waveguide comprises two rows of metalized via holes; each of the two rows of metalized via holes comprises a straight section and an open section; the straight sections are parallel to one another, one end of each straight section is connected to the feed waveguide and the open sections gradually expand towards two sides along the corresponding straight sections; the substrate integrated waveguide comprises the two rows of metalized via holes; the dipole array comprises a plurality of array elements; the array elements are connected with an upper metal surface and a lower metal surface of the substrate integrated waveguide; and the spaces between the array elements and between the calibers of the open sections are different, so that the planar end-fire circular polarization antenna is low in requirements on a feed network, high in gain, simple in structure and easy to integrate, and the end-fire beam direction and the plane of the antenna are coplanar.

Antenna devices that include a frequency selective surface (FSS) resistive card (R-card) to suppress ground plane interference are provided. The antenna device can include a tightly coupled dipole array (TCDA), and the FSS R-card can be a saw-tooth ring that only attenuates the intended frequencies. The antenna device can be an extremely wideband phased array with integrated feeding network and spatial scanning down to 60°.

The invention discloses a super-wide bandwidth angle antenna array based on an inter-digital tightly coupled dipole unit. The array comprises an inter-digital dipole and a feeder balun, the feeder balun consists of three parts: a plane double line, a gradient transmission line used as the ground and a final micro-strip line, so that impedance matching from 170Omega to 50Omega and electric field transition from unbalance to balance are achieved. Based on a dipole array antenna, a mutual coupling effect between array elements is utilized to expand a phased array frequency band bandwidth, and a wide angle matching layer is introduced to improve a scanning characteristic of the antenna array. Because the antenna takes the tightly coupled dipole unit as a terminal load, a balanced feed form is needed, but a general feed source is an unbalanced feed source like an axis, so that stable unbalance-balance transition is needed to be completed by the feeder balun to ensure broadband performance of the antenna array. The super-wide bandwidth angle antenna array based on the inter-digital tightly coupled dipole unit has the advantages of being simple in structure, compact in size, wide in bandwidth angle and easy to process, and has significance of practical engineering.

The invention provides an ultra-wideband microstrip cylindrical conformal array antenna, which is composed of a plurality of microstrip logarithmic periodic antenna elements and a hollow cylinder which are conformal. The microstrip logarithmic periodic antenna element consists of two identical fractal dipole array patches attached to the inner and outer surfaces of the cylindrical carrier respectively and symmetrically distributed with respect to the rectangular feeder. Each fractal dipole array patch consists of 9 fractal monopoles with a Koch curve structure and rectangular feeders. A coaxial feed line feeds simultaneously a plurality of microstrip logarithmic periodic antenna elements, and energy is radiated from one end of the shortest dipole. The invention has the advantages of easy conformation, small size, ultra-wide band, high gain, simple structure and the like, and is suitable for communication, lateral direction, reconnaissance, electronic countermeasure and the like.

The present invention relates to an antenna device for wireless transmission and reception of information using electromagnetic signals, comprising at least two dipole antenna elements, where each dipole antenna element comprises a first dipole arm and a second dipole arm, which first and second dipole arms are extending in essentially opposite directions from a respective feeding point end. The dipole arms are formed in metal layers on a laminate, having a first side and a second side, which laminate further has a predefined thickness (T) separating the first and second side. Each first dipole arm extend on the first side of the laminate and each second dipole arm extend on the second side of the laminate in such a way that the two adjacent dipole arms of adjacent antenna elements partially overlap during a distance (D).

The invention provides a millimeter-wave low-profile broadband circularly-polarized slot-fed dipole antenna array. The millimeter-wave low-profile broadband circularly-polarized slot-fed dipole antenna array comprises an antenna radiator, parasitic patches, a broadband SIW sequential rotating feed network, a three-layer dielectric substrate and metalized through holes, wherein the radiator is arranged on the upper surface of the top dielectric substrate, and the parasitic patches are arranged around the radiator; the broadband SIW sequential rotation feed network is arranged on the bottom layer and the middle layer of the antenna; and the metalized through holes are positioned at the peripheries of the top-layer radiator and the parasitic patches. On the basis of a common circularly-polarized magnetoelectric dipole antenna structure, the chamfered parasitic patches are introduced to the periphery of the dipole antenna, so the structure realizes the characteristic of broadband circular polarization while having a low profile. Meanwhile, sequential rotation feed is utilized at the lower layer of a unit, so the axial ratio bandwidth of the antenna array is expanded. The antenna is small in physical size, low in profile and suitable for 5G millimeter wave circular polarization communication.

A broadband dipole array antenna adopted for use in radio transmission includes a feed network, radiation units and a reflection plate. The antenna is held vertically in a trough of the reflection plate, which reflects the radiation signals of the antenna to enhance antenna directionality. The antenna and the reflection plate are fastened with adhesive tape or a Velcro strip in the trough to facilitate assembly of the antenna.

The invention discloses a rock scattering attenuation calculation method using multi-parameter integrated inversion; the method comprises the following steps: carrying out array acoustic logging in a depth section, thus obtaining dipole array waveform data in the depth section; calculating a power spectrum of each depth point actual measuring waveform; building inversion objective functions; using the least squares to obtain the scattering attenuation of each depth point; loop executing step 2 to step 4, thus finally obtaining the scattering attenuation curve of the depth section. The method can accurately parse the acoustic logging data and extract scattering attenuation of elastic waves, thus providing valuable stratum information; compared with the large scale seismic wave scattering attenuation, the acoustic logging calculated scattering attenuation can provide the underground rock small scale heterogeneity information.

A multi-band dipole array antenna is constructed by coupling a coaxial feed line in an axial direction thereof with at least two PCB-antenna sets connected in series. By adjusting or setting the distance between the PCB antennas and the length of the coaxial feed line, a stable radiation transmitting-receiving performance with an omni-directional efficacy and a high radiation gain for at least two wavebands can be achieved.

A broadband symmetrical dipole array antenna adopted for use in radio transmission includes a symmetrical feed network, symmetrical radiation units and a reflection plate. The symmetrical feed network and the symmetrical radiation units form an antenna field of a narrower radiation angle range. The reflection plate is spaced from one side of the antenna in a parallel fashion at a selected distance to reflect the radiation signals and enhance antenna directionality.

A cellular base station antenna having improves squint performance is provided. The antenna includes a ground plane, a first plurality of radiating elements supported over the ground plane by microstrip support PCBs, and a second plurality of radiating elements supported over the ground plane by stripline support PCBs. The first and second pluralities of radiating elements are arranged in at least one array of low band radiating elements, and the quantities of first and second pluralities of radiating elements are selected to reduce squint of a beam produced by the at least one array. The first plurality of radiating elements may be located below the second plurality of radiating elements in the array. The array may be arranged in a linear column or a staggered column. In one example, the first plurality of radiating elements comprises four radiating elements and the second plurality radiating elements comprises two radiating elements.

The invention provides a circular polarization electromagnetic dipole array antenna, which comprises four sub-arrays arranged on a dielectric plate and a sequence phase feed network, wherein each sub-array includes four antenna units, and the whole array antenna includes 16 antenna units; each sub-array is fed by a one-to-four power divider; in each sub-array, the one-to-four power divider is composed of a five integrated waveguide-to-coaxial line converter, one of the substrate integrated waveguides serves as the input, and energy is outputted by a coaxial line through the converter and allocated to the remaining four substrate integrated waveguides, is then transmitted to the coaxial line through the converter and finally supplies power to the four antenna units of the sub-array. The circular polarization electromagnetic dipole array antenna is simple in feed structure, uses the substrate integrated waveguide with high impedance as the input, simplifies the design of the sequence phase feed network and realizes the miniaturization of the overall structure.

The invention relates to a method for multi-parameter joint estimation of a distributed type electromagnetic vector sensor array and belongs to the field of array signal processing. Received data of the distributed type electromagnetic vector sensor array are constructed, covariance matrixes are performed on received data of an electric dipole and a magnetic dipole respectively and adding summation is performed, a covariance matrix sum only containing an information source azimuth parameter is obtained, a sparse signal reconstruction method is utilized to estimate the information source incident azimuth; and the estimation of polarization parameters is obtained by utilizing maxtrix relations of autocovariance and cross covariance of an electric dipole array and a magnetic dipole array. According to the method, the joint estimation of multi-dimensional parameters is converted into substep estimation of a plurality of one-dimensional parameters, the calculation complexity of the method is lowered; by distributed placing of electric dipole and magnetic dipole sensors, not only is the cross coupling influence between array elements reduced, but also the array physical pore diameter is extended effectively, and the parameter estimation accuracy is improved greatly.

The invention discloses a multi-port frequency-division tunable antenna which comprises a reflection plate and a feed network module, wherein the feed network module comprises a phase shifter module, a frequency divider array and a power divider, the frequency divider array is connected with the phase shifter module, the power divider is connected with the phase shifter module, the back side of the reflection plate is connected with the frequency divider array, the front side of the reflection plate is provided with a wideband dipole array through a non-conductive mode, and the wideband dipole array comprises dipole units. In the antenna, through the design of the phase shifter module and the power divider matched with the frequency divider array, a signal of a wideband radiator or the antenna is divided into two paths or even multiple paths of independent sub signals so as to form two pairs or even multiple pairs of antennas with different frequency bands; on the condition of no increase of the antenna volume, at least one pair of antenna is equivalently added; and on the premise of ensuring performance, approximate half of the antenna volume is reduced, and space resources of a base station are greatly saved.