202 results about "Microstrip array antenna" patented technology

The invention belongs to the technical field of millimeter wave microstrip array antenna and discloses a millimeter wave beam-shaped microstrip array antenna based on SIW and a design method thereof.The microstrip radiation layer is located on the upper surface of the upper dielectric substrate of the millimeter wave beam-shaped microstrip array antenna, The SIW feed network layer is located on the lower dielectric substrate of the millimeter-wave beam-shaped microstrip array antenna. Chebyshev synthesis and tapered microstrip gradient line are used to realize the single-side series-fed microstrip array, and the series-fed microstrip arrays are separated by the isolation band. Differential evolutionary optimization algorithm is used to beam shape the pattern. The upper surface of the SIWfeed network layer is slotted with wide edges, and the SIW feed network layer is composed of SIW-slit-Microstrip Line Coupling Structure, SIW Power Divider, SIW Phase Shifter and Cone SIW-Microstrip Line Converter. The invention realizes unequal amplitude and different phase feeding, realizes the specific shaped beam of the microstrip array antenna, and solves the problem that the traditional in-phase feeding is difficult to have the shaped beam pattern.

The invention discloses an array antenna used for reducing radar scattering cross section, and mainly solves a problem of large scattering cross section of a present microstrip array antenna radar. The array antenna in the invention comprises a medium plate, a ground plate and n microstrip radiation units (2). The n microstrip radiation units (2) are on the upper surface of the medium plate (1). The ground plate (3) is on the lower surface of the medium plate (1). Structural type absorbing material arrays (4) are provided between each two adjacent microstrip radiation units, and N*M square metal pasters (5) are arranged as rectangular. The metal pasters (5) form inductances L. Connection resistors (7) connect adjacent metal pasters to form resistors R. Gap (6) between adjacent metal pasters (5) form capacitors C. The capacitors C, the inductances L and the resistors R form RLC resonance circuits. By adjusting resonance circuits frequency to superpose the resonance circuits frequency with antenna work frequency, absorption of vertical incident surface wave is realized. The array antenna used for reducing radar scattering cross section in the invention has the advantages of stable performance of reducing in-band and outband radar scattering cross sections of antenna and no influence on antenna volume, weight and cost.

The invention discloses an electromagnetic band gap structure based dual-frequency microstrip array antenna with high isolation. The dual-frequency microstrip array antenna comprises two oscillators of the array antenna and an L-shaped electromagnetic band gap unit organized array, wherein the L-shaped electromagnetic band gap unit organized array is loaded between the two oscillators, the two oscillators and the L-shaped electromagnetic band gap unit organized array are all supported on a FR4 dielectric substrate, each oscillator comprises a high-frequency monopole, a low-frequency monopole, a microstrip feeder line and metal ground, the high-frequency monopole and the lower-frequency monopole are connected with the microstrip feeder line, the microstrip feeder line is inserted into the metal ground, the L-shaped electromagnetic band gap unit organized array comprises a plurality of L-shaped electromagnetic bang gap units arranged in an array, each L-shaped electromagnetic band gap unit comprises an electromagnetic band gap metal patch, and the electromagnetic band gap metal patch is connected with a ground floor on other side via a conductive via hole in the middle. In the dual-frequency microstrip array antenna, the working frequency band is 2.27-2.67GHz and 5.29-7.09GHz, and the frequency band range of WLAN is completely covered; and the electromagnetic band gap structure with dual-band gap characteristic is loaded between oscillator units, and thus, the antenna has relatively high isolation in dual frequency bands.

The invention belongs to the technical field of microstrip array antennae and particularly relates to a super-surface based variable-polarization multifunctional microstrip array antenna. The microstrip array antenna consists of a feed source and a microstrip array, wherein the feed source is arranged at a focus of the microstrip array; the feed source is a broadband Vivaldi antenna, adopts microstrip coupled feed, and consists of upper slotting metal, a middle dielectric plate and a lower microstrip line; the microstrip array consists of N*N GMS units; each GMS unit is composed of three layers of metal structures and two layers of dielectric plates; each layer of metal structure is obtained by etching CDSRRs with different rotational angles on a square patch; the upper, middle and lower structures are identical in parameter; and only the CDSRRs are clockwise rotated at an angle of 45 degrees in sequence. According to the antenna, a reflection function and a transmission function are integrated, the function switching among the reflection function, a bidirectional radiation function and the transmission function of the microstrip array is realized, and the polarization state switching between a co-polarization state and a cross-polarization state is realized. The antenna has the characteristics of high reusability, high integration level, numerous functions and the like.

The invention relates to the technical field of an antenna and particularly relates to a high isolation low cross polarization dual-polarization microstrip array antenna. The microstrip array antennacomprises a parasitic layer, a radiation layer, a dielectric layer between the parasitic layer and the radiation layer, a feeding layer and a fixing member. The microstrip array antenna is advantagedin that a high dielectric constant substrate and an H-shaped gap coupling structure are employed to improve feeding coupling efficiency, the gap size is reduced, inter-port isolation and the cross polarization level are improved, a parasitic patch is introduced to broaden impedance bandwidth of the antenna, the higher antenna gain is obtained through the 2*2 array structure, through designing therelatively sparse parallel feed network and arranging metal through holes in dense feeders, mutual coupling between the feeders is reduced, inter-port isolation is further improved, and the cross polarization level is reduced.

The invention discloses a microstrip array antenna and relates to an antenna capable of resolving problem of low main lobe gain and difficult side-lobe suppression of ETC array antenna. The microstrip array antenna includes a antenna array composed of more than two antenna array elements, the antenna matrix includes more than two antenna array elements in the same row with each the antenna array element connecting with each output terminal port of one multiplex power divider, and between the adjacent antenna array elements, that are in different distance from the central line of the antenna matrix, is connected by cascaded impedance transforming section. The invention is suitable for antennas in ETC system.

The invention discloses a differential filtering microstrip array antenna having high common-mode rejection. The antenna mainly comprises three layers of structures as follows: a feed network, a ground comprising a slot structure as well as four patch radiation units containing H-shaped resonator stimulation. The core content of the antenna is as follows: the antenna adopts the multiple layers of structures, first two orders of resonators are arranged at the first layer and the second layer respectively and are coupled through a slot at the second layer, the natural high common-mode rejection effect can be realized, and the natural 180-degree difference can also be formed at two ends of a second-order resonator by the aid of slot coupling, so that the second-order resonator has the Balun function; meanwhile, the second-order resonator is designed into the H shape and can further realize a power quartering function. Under the condition that no additional cascade filters exist and the area is increased, the antenna has the good filter characteristic and is minimized. In general, the antenna has the characteristics of high selectivity, high common-mode rejection, high gain, small size and the like.

The present invention provides a 77 GHz millimeter-wave radar-based micro-strip array antenna, which comprises a dielectric substrate, and a plurality of antennas arranged on the dielectric substrate.Each antenna consists of a plurality of antenna patches and a feeder line. The antenna patches of each antenna are arranged in a straight line and are connected to one another through the feeder line, wherein the antennas are parallel to one another. The plurality of antennas are composed of multiple transmitting antennas and multiple receiving antennas. The distances between every two adjacent transmitting antennas are equal. The distances between every two adjacent receiving antennas are equal. In this way, an equidistant series-feed network is formed. The plurality of antenna patches of each antenna are gradually changed in width. The 77 GHz millimeter-wave radar-based micro-strip array antenna has the advantages of high stability, small size, low cost, high precision, high response speed and high resolution. The 77 GHz millimeter-wave radar-based micro-strip array antenna can be applied to the millimeter-wave radar system schemes which are low in cost, small in size and high in performance and are used for medium-distance and long-distance detection.

The invention relates to the technical field of antennas, in particular to a millimeter-wave microstrip array antenna. The millimeter-wave microstrip array antenna comprises a dielectric plate, patch array antennas and a feed network, wherein the dielectric plate comprises a double-layer plate body, and a metal ground is clamped between the two layers of the double-layer plate body; the feed network is a one-to-n path of T-type power dividing circuit, each branch port of the feed network is provided with a feed point, the patch array antennas are arranged in n columns, and central symmetry points of the patch array antennas are provided with coaxial feed probes which penetrate the dielectric plate vertically so as to connect the feed points with the patch array antenna; and on the same column of the patch array antennas, the coaxial feed probes are directly connected between relatively proximate microstrip patches on a group of patch units, and are interconnected between relatively proximate microstrip patches on another group of patch units by means of 180-degree phase shifters. The millimeter-wave microstrip array antenna has the advantages of high gain, low sidelobe and miniaturization, and can effectively realize the high integration and miniaturization requirements of the whole antenna structure.

The invention relates to a microstrip array antenna. The microstrip array antenna includes a first dielectric substrate (10), a patch antenna (20) and parasitic patches; the first dielectric substrate (10) includes a first surface (11); the patch antenna (20) includes a plurality of patch antenna sub arrays (21) which are respectively arranged on the first surface (11), wherein each patch antenna sub array (21) includes a plurality of patch units; the parasitic patches are arranged on the first surface (11); the parasitic patches and the patch antenna (20) are located on the same plane; and the parasitic patches include first parasitic patches (31) which are located at the center of each patch antenna sub array (21). With the microstrip array antenna provided by the technical scheme of the invention adopted, the problem of mutual coupling between array units of a metal patch in the prior art can be effectively solved.

The invention provides a defected ground decoupling structure used for a microstrip array antenna. Two microstrip array antenna array elements are arranged on a common grounding plate, wherein a groove structure is designed on the common grounding plate between the two microstrip array antenna array elements; each microstrip array antenna array element comprises a dielectric substrate and a rectangular radiation patch and a coaxial feed element which are arranged on the upper surface of the dielectric substrate; the coaxial feed element of each microstrip array antenna array element is connected with the corresponding rectangular radiation patch and an SMA inner conductor concurrently; the SMA inner conductor is connected with the common grounding plate; the groove structure comprises two comb-shaped defected ground structures which are arranged oppositely in a crossed manner; each comb-shaped defected ground structure comprises a comb handle unit and comb teeth units; and the difference between the number of the comb teeth in the first group of comb teeth units and the number of the comb teeth in the second group of comb teeth units is 1. By adoption of the defected ground decoupling structure, the coupling energy between antennas is absorbed; in addition, the isolation degree between the array antennas is improved, thereby satisfying the requirements of the antennas; and in addition, the defected ground decoupling structure has the advantages of simple design and convenient processing.

The invention discloses a sixteen-unit micro-strip array antenna capable of carrying out power equal-division rotating feed. The sixteen-unit micro-strip array antenna capable of carrying out the power equal-division rotating feed is obtained in a copper coating configuration mode on a substrate, power is equally divided through a center feed network, four antenna array units are distributed, and the four antenna array units are arranged in a double-sequence mode. Due to the fact that the design mode of double-sequence rotation of feed networks is adopted by the sixteen-unit micro-strip array antenna capable of carrying out the power equal-division rotating feed, directivity of the sixteen-unit micro-strip array antenna capable of carrying out the power equal-division rotating feed can be better, the whole sixteen-unit micro-strip array antenna capable of carrying out the power equal-division rotating feed and the antenna array units have the same impedance characteristic and the same circular polarization characteristic or a better impedance characteristic and a better circular polarization characteristic, and the sixteen-unit micro-strip array antenna capable of carrying out the power equal-division rotating feed is more applicable to a satellite communication system.

This invention relates to a microstrip array antenna, especially a broad-band dual-polarized microstrip array antenna having parallel feeding structure whose consist of two parts power supplying layers each of which generates its own polarization respectively. And the broad-band dual-polarized microstrip array antenna according to the present invention arranges transmission paths for two separate linear polarization on a different layer each other in order to minimize an interference effect and a proximity feeding method and an aperture coupled method are used in order to get two separate polarization.

The invention discloses a series fed microstrip array antenna design method. The method includes the following steps that: the equivalent wavelength of electromagnetic waves in a dielectric plate is determined; the number of units is determined according to antenna size and the equivalent wavelength; the excitation current of each antenna unit is designed according to designed sidelobe electric level; the power of each unit is determined according to the excitation current, and the impedance of each unit is determined according to a situation that resistance be inversely proportional to power; and antenna patch size is designed according to the determined impedance of the units. According to the series fed microstrip array antenna design method, the impedance of a main feeder line and patches are adjusted to be real impedance through triangular sheets, and the main feeder line and the patches are adjusted and matched at an outlet; and plated-through holes are formed between two antennas, so that the degree of isolation between the antennas can be increased. With the method adopted, a series fed microstrip array antenna can be designed simply and intuitively.

The invention discloses a broadband compact type microstrip array antenna. An even number of lines of microstrip patches and an even number of columns of microstrip patches are arranged on a dielectric substrate; two x-direction series-wound feedback networks which are connected together through a feedback structure are arranged on the dielectric substrate along an x-axis direction; the x-direction series-wound feedback networks divide the even number of columns of microstrip patches into two parts; the microstrip patches on the left part and the microstrip patches on the right part of each row are connected with adjacent y-direction series-wound feedback networks to form a sub array; the microstrip patches of the left side sub array in each row and the microstrip patches for forming the right side sub array in each row are connected with one y-direction series-wound feedback network separately to feed; the left side sub arrays in each row are connected with the right side sub arrays in each row in parallel; two sub arrays, which are adjacent along the x direction, of the 1/2 antenna array up and down are connected in series; and the array formed by the microstrip patches on the upper half part of the dielectric substrate and the array formed by the microstrip patches on the lower half part of the dielectric substrate are connected in parallel along the x-axis direction through the feed structure.

The invention provides an LTCC aperture coupling array antenna, belongs to the technical field of antennas and aims at overcoming the defects of an existing micro-strip array antenna in the aspect of giving consideration to miniaturization, broadband and high gain. The LTCC aperture coupling array antenna comprises upper and lower layer radiation metal patch units, upper, middle and lower layer dielectric substrates, a grounded metal layer, resonance apertures and a micro-strip feed network, wherein the upper layer radiation metal patch units are arranged in triangular lattices, and the lower radiation metal patch units are arranged in rectangular lattices. Compared with regular micro-strip patch array antennas based on organic media or ceramic substrates, the LTCC aperture coupling array antenna is capable of obtaining a larger antenna bandwidth under the same size limit and giving better consideration to the performance requirements of miniaturization, broadband and high gain of the patch antenna.

The invention discloses a micro-strip array antenna and a base station, and relates to the technical field of antennas. The micro-strip array antenna and the base station aim to resolve the problems that when a probe is installed and welded manually, production efficiency is low, welding consistency is poor, and a certain degree of deterioration of electrical performance of the antenna will be caused. The micro-strip array antenna comprises a plurality of conductor layers and insulation interval layers, one insulation interval layer is arranged between every two conductor layers, the conductor layers and the insulation interval layers are arranged in a stacked mode, and at least one of the conductor layers is a reference ground layer; at least one conductor layer is a radiation unit layer; at least one conductor layer is a feed network layer; all feed points on the at least one radiation unit layer are correspondingly connected with all feed points on the at least one feed network layer through metallization via holes in the insulation interval layers. The micro-strip array antenna and the base station can be used for design of mobile communication base antennas.

The invention discloses a mutual coupling compensation analysis method for a microstrip array antenna. The method comprises the following steps of: modeling an array antenna structure, and performing delaunay triangulation on the structure by using the delaunay of a MATLAB function to divide the surface of a metal to be researched into a series of triangles, wherein each pair of triangles with common sides forms corresponding Rao-Wilton-Glisson (RWG) side elements; and replacing the surface current distribution of the RWG side elements of two triangles by using an infinitesimal dipole with an equivalent dipole moment or strength by adopting a dipole modeling method, and determining the electromagnetic radiation characteristics of a free space for surface current. A mutual impedance array, solved by adopting a moment method, of the microstrip array antenna takes the effect of mutual coupling between adjacent radiation elements into account. Therefore, a mutual coupling weight vector of an array unit is corrected during weight vector calculation mutual coupling effect correction to further optimize the output direction characteristics of an array.

The invention relates to a microstrip array antenna system based on a 77 GHz millimeter wave radar, and belongs to the antenna technical field. The system comprises a dielectric substrate, and a transmitting antenna and a receiving antenna arranged on the dielectric substrate. The transmitting antenna comprises a first type linear transmitting antenna and a planar array transmitting antenna. The receiving antenna comprises a linear receiving antenna. The transmitting antenna and the receiving antenna are connected with a 77 GHz millimeter wave radar. Compared with the prior art, the present invention has the advantages of low cost, small volume, high performance and the like, and can be used for medium-range and long-range detection.

The invention discloses a single-port broadband dual-circular polarization dual-directional beam microstrip array antenna. The antenna comprises a radiation unit array (1) which is composed of circular radiation patches (1a) arranged periodically, a metal floor (2) provided with an H-shaped coupling gap (2a), a single-port feed network (3) composed of an equal-amplitude power division phase shiftfeed network (3c) or an unequal-amplitude power division phase shift feed network (3d), and a first dielectric substrate layer (4), a bonding layer (5) and a second dielectric substrate layer (6) aresequentially arranged from top to bottom. Each H-shaped coupling slot (2a) rotates at different angles around a respective geometric center, and the geometric center of each H-shaped coupling slot (2a) is located right below the circular radiation patch (1a). By using the structure of the invention, through designing the rotation angle of each H-shaped coupling slot (2a) and the amplitude and phase distribution of each output port (3b) of the single-port feed network (3), dual-circular polarization dual-directional radiation beams can be realized, and the antenna has the advantages of wide frequency band, low profile, simple manufacturing and the like.

A vehicle speed detection radar design and signal processing method is embodied by a radar design proposal for achieving the comprehensive aims of low price, high performance and small size. A radar is composed of two parts of a radar front end and a high-speed digital signal processor; and the front end of the radar is composed of a transmitting micro-band array antenna, a receiving micro-band array antenna, a voltage control microwave source with a frequency stabilization circuit, a dual-line balanced mixer, a dual-channel Doppler signal amplification-filter circuit and a dual-channel analog-digital conversion circuit. The front end of the radar uses the integrated design on the structure and the electricity, and the high-speed digital signal processor uses the fast discrete Fourier transform and the orthogonal signal processing methods to obtain the target speed value. The micro-band array antenna of the invention has good direction, so the radar can respectively monitor each lane; a radar system has fast response time and can detect the vehicles which excessively exceed the speed limit; the radar system simultaneously has thinner size, good anti-interference performance, low material cost and low processing cost.

The invention relates to a bandwidth improved four-unit microstrip array antenna. Four rectangular radiation paths, an array unit feed line, a microstrip one to four power divider, a dielectric substrate, a feed port and the floor are included, the four-unit microstrip array antenna is connected with the microstrip one to four power divider, the microstrip one to four power divider and the floor are connected with the feed port, each rectangular radiation patch is etched with a groove slit, and the lengths of different slits are different. Four grooves in different lengths are added to the antenna, the patch units are reduced in the size while the work bandwidth of the antenna is increased, in particular the dielectric material is placed on a thin dielectric plate with a flexible medium orin the thickness lower than 1mm, and the method can be used to increase the bandwidth by 400% from 30M to 150M in 2.4GHz.

The invention provides a broadband low-scattering microstrip array antenna based on a coding metasurface. The array antenna comprises a square upper-layer dielectric plate, a middle-layer dielectric plate and a lower-layer dielectric plate which are arranged from top to bottom and are not in contact with one another; m*M rectangular microstrip radiation patches which are periodically arranged areprinted at the central position of the upper surface of the upper dielectric plate; a coding metasurface is printed on the upper surface of the middle dielectric plate, a single-input M2-output microstrip feed network is printed on the upper surface of the lower dielectric plate, a metal radiation floor is printed on the lower surface of the lower dielectric plate, and the microstrip feed networkis connected with the rectangular microstrip radiation patch through a metal probe penetrating through the middle dielectric plate and the upper dielectric plate. By highly integrating the coding metasurface and the microstrip array antenna, remarkable RCS reduction is achieved while the radiation characteristic is guaranteed, and the technical problems that in the prior art, the RCS reduction bandwidth of an antenna is narrow, and the radiation performance and the scattering performance of the antenna are difficult to consider at the same time are solved.

The invention relates to a waveguide series-feed network capable of realizing arbitrary power-dividing ratio. A plurality of microstrip probes are inserted into the broad-side center line of a rectangular waveguide at intervals, and energy coupled from the waveguide by the probes can be changed by adjusting the extension lengths of the microstrip probes into the rectangular waveguide, so as to realize arbitrary power-dividing ratio. Strong reflection which can be aroused when the microstrip probes are inserted into the rectangular waveguide can be canceled through adjusting the sizes of tuning blocks, and the tuning blocks are symmetrically placed at corresponding positions near the microstrip probes and clung to two broad sides of the waveguide, so that transmission of traveling waves of a master mold in the waveguide can be ensured. The waveguide series-feed network provided by the invention can be connected with microstrip feed networks, coaxial feed networks, stripline feed networks, suspended stripline feed networks, coplanar waveguide feed networks and other feed networks, the functions of simplifying the structure of the whole feed networks and lowering the loss of the feed networks can be performed, and the waveguide series-feed network can serve as a feed network of a higher-frequency large-scale microstrip array antenna.

The invention discloses a low-sidelobe circular polarized microstrip array antenna applied to an electronic toll collection (ETC) system, wherein the antenna is has a three-layer structure successively including a metal foil, a dielectric substrate and a metal foil. A microstrip feed network and radiation units are arranged on the metal foil on the top of the structure; the radiation units employs a grouping mode in which n radiation units are arranged transversely and two radiation units are arranged longitudinally. There is a rotation angle difference of 90 degrees anticlockwise between each of the radiation unit above the longitudinal column and each of the radiation unit below the longitudinal column; compared with a feed phase of the radiation unit below the longitudinal column, a feed phase of the radiation unit above the longitudinal column is delayed by 90 degrees; and magnitudes of the feed currents of the radiation units at the same longitudinal column are equal. A feed joint is utilized to realize application of current excitation on a whole microstrip feed network, so that the whole microstrip feed network applies currents on all the radiation units. A simplified dolph-chebyshev distribution is utilized for current magnitude ratios that are needed by the radiation units on a same transverse line; and current phases are equal. According to the invention, the microstrip antenna has advantages of low axial ratio, low sidelobe and high gain; and moreover, the antenna is easy to process and install; therefore, the provided antenna can be widely applied to the electric toll field and other related fields.

The invention discloses a dual-frequency dual-circularly polarized microstrip array antenna with wide axial ratio bandwidth. The microstrip array antenna comprises a monolayer microwave dielectric substrate, four dual-frequency linearly polarized radiation patches with working frequencies of f1 and f2, and a dual-frequency shared microstrip power dividing network. Wherein, the dual-frequency linearly polarized radiation patch with the working frequency f1, f2 is uniformly distributed on the circumference with the point O as the center; The dual-frequency shared microstrip power dividing network comprises two Wilkinson power dividers, two dual-frequency shared 90-degree phase shifters composed of microstrip lines, and one dual-frequency shared 180-degree phase shifter. The invention effectively increases the dual-frequency circular polarization axial ratio bandwidth, and can be conveniently expanded into a high-gain array with a larger aperture, adopts a single-layer dielectric plate, and the array element is a single unit, the structure is simple, the profile is low, and realization is easye.

The invention provides an axial ratio optimization method of a rotating circular polarization microstrip array antenna in a wide-angle scanning state. By means of the method, the axial ratio of the rotating circular polarization microstrip array antenna in the wide-angle scanning state can be remarkably improved, and a high antenna gain and back lobe level can be achieved. The method includes the steps that an array antenna simulation model is established in simulation software, namely, an HFSS (High Frequency Structure Simulator); simulation calculation is conducted on the array antenna in the wide-angle scanning state, and targeted to any beam pointing, orthogonal electric field data of all array elements in all units is stored and output through a VBscript program; then, a 2*2 sub-array serves as a calculation unit, array element electric field data serves as the basis, and the excitation amplitude and the excitation phase actually required by all the array elements in all the units meeting the circular polarization condition are calculated through a MATLAB (matrix laboratory) program; an HFSS simulation data processing module directly loads the excitation amplitude and the excitation phase actually required by all the units and stored and output by the MATLAB to conduct simulation calculation again, and axial ratio optimization is achieved.