179 results about "Planar array antenna" patented technology

In an atmosphere of processing gas, on a wafer W consisting mainly of silicon, through a planar-array antenna RLSA 60 having a plurality of slits, microwaves are irradiated to generate plasma containing oxygen, or nitrogen, or oxygen and nitrogen and to implement therewith on the surface of the wafer W direct oxidizing, nitriding, or oxy-nitriding to deposit an insulator film 2 of a thickness of 1 nm or less in terms of oxide film. A manufacturing method and apparatus of semiconductors that can successfully regulate film quality of the interface between a silicon substrate and a SiN film and can form SiN film of high quality in a short time can be obtained.

PCT No. PCT/IL96/00037 Sec. 371 Date Jun. 11, 1999 Sec. 102(e) Date Jun. 11, 1999 PCT Filed Jul. 4, 1996 PCT Pub. No. WO98/01921 PCT Pub. Date Jan. 15, 1998A dual-frequency array antenna having an essentially planar structure with electronic beam steering capability in both a low and high frequency band independently of each other, constructed, in a layered formation, from a top planar array antenna unit operating in the low frequency band and a bottom planar array antenna unit operating in the high frequency band. The top planar array antenna is transparent to frequencies in the high frequency band.

The invention provides a method for constructing a thinned MIMO (Multiple Input Multiple Output) planar array radar antenna, which is on the basis of a phase center approximation principle and combines an MIMO antenna thought. The antenna arrangement optimal design is carried out by adopting the MIMO antenna thought. When all transmitting array elements simultaneously (or in turns) transmit orthogonal signals and receiving array elements simultaneously receive echo signals, a virtual planar array with uniform intervals is subjected to equivalence processing by utilizing the phase center approximation principle. According to the thinned MIMO planar array radar antenna constructed according to the invention, few transmitting antenna array elements and few receiving antenna array elements can be adopted and the equivalent full-array-element arrangement planar antenna array is virtually realized. Compared with the planar array antenna which is the same size as the equivalent virtual planar array and is directly arranged, the thinned MIMO planar array radar antenna constructed according to the method disclosed by the invention has the advantage of greatly reducing the requirement on the number of the array elements.

Disclosed are feedback and transmission devices and methods in full-dimension multi-antenna systems using two-dimensional (2D) planar array antennas, wherein a UE estimates channel states each corresponding to a respective one of multiple domain channels by a reference signal received from a base station, and obtains precoding matrix indicators (PMIs) each corresponding to a respective one of the multiple domain channels and rank indicators (RIs) each corresponding to a respective one of the multiple domain channels based on the estimated channel states. The UE may determine a joint rank indicator (JRI) using the obtained PMIs and the RIs and transmit feedback information containing the determined JRI to the base station.

The invention provides a method for forming circular array antenna digital wave beams. Part of adjacent arrays in a circular array consisting of a plurality of arrays form a small circular array, a main wave beam extending outward along the centre of a circle is formed in the normal direction of the arrays in the center of the circular array, so that a circular array can be constructed by taking every array as a center so as to form a wave beam extending outward along the center of the circle, and the whole circular array can form a plurality of wave beams at equal intervals, which cover the 360-degree space; thus the circular array antenna digital wave beams are formed. The method solves the problems of the prior art, and the problems that a planar array antenna cannot simultaneously cover the 360-degree space, and the antenna beamwidth is increased along with the increment of a scanning angle and the antenna gain and angle measurement accuracy are reduced along with the increment of the scanning angle.

The present invention belongs to the field of electromagnetic value computing, and particularly relates to a rapid and accurate analysis method for large-scale MIMO array antenna far-field radiation. The method comprises: determining a structural parameter of an M*N-element plane array antenna; computing a relationship between an incident field and a scattered field of an element antenna; according to mutual coupling characteristics among element antennas, selecting a sub-array form and size of an extraction unit on an array environment condition; for an antenna sub-array of the extraction unit, computing a unit far-field radiation pattern of the sub-array; and according to the unit far-field radiation patterns of the array and a superposition principle, computing an array antenna far-field radiation pattern. According to the invention, by utilizing the accuracy of mutual coupling computation, the problems that the use of such methods as the moment method, the finite element method and the finite difference time domain (FDTD) method are limited by computing capacity of a single computer, and when the scale of the array antenna is too large, rapid and accurate computation of the antenna radiation field cannot be implemented with a full wave simulation method because of large consumption of memory and computing time, are effectively solved. The method provided by the invention is capable of analyzing the radiation pattern of a large and conformal array antenna, and has higher synthesizing accuracy and higher analysis speed.

The invention discloses a ridge waveguide planar array antenna employing mechanical center feeding. The ridge waveguide planar array antenna comprises a grid layer, a radiation layer, a coupling layer, a feed network layer and a center feed layer, which are sequentially stacked, wherein the mechanical center of the center feed layer is provided with a feeding opening which is vertical to an antenna array and is used for inputting and outputting a signal; the feed network layer is composed of a single ridge waveguide; and ridges are arranged at the centers of narrow sides of various branches of a ridge waveguide power divider on the feed network layer. Through introducing the grid layer and the center feed layer, adopting the design of a ridge waveguide power dividing network, and successfully combining with other structure layers, the targets of improving the out-of-roundness of an antenna radiation pattern, improving the antenna standing wave bandwidth and realizing mechanical center feeding of the antenna are achieved.

A planar array antenna using a multi-layer substrate having an intermediate layer conductor in a laminated face comprises: four pieces of planar antenna elements disposed at each of geometrically square shaped apexes; first and second slot lines formed in the intermediate layer conductor, and intersecting each other; first to fourth microstrip lines formed along each side of geometrical squares so as to be coupled to each antenna element, and at the same time, electromagnetically coupled to first and second slot lines at both ends of these slot lines; and fifth and sixth microstrip lines, the top end sides thereof traversing the first and second slot lines, respectively, so as to be electromagnetically coupled to the first and second slot lines.

A dynamically-reconfigurable feed network antenna having a microstrip patchwork radiating surface wherein individual radiating patches and elements of a stripline feed structure can be connected to and disconnected from each other via photoconductive interconnections. Commands from software alternately turn light from light emitting sources on or off, the light or lack thereof being channeled from an underside layer of the antenna so as to enable or disable the photoconductive interconnections. The resultant connection or disconnection of the radiating patches to each other and to the stripline feed structure will vary the antenna's frequency, bandwidth, and beam pointing.

Disclosed is a planar array antenna and difference beam forming method, that is, under the premise of reducing the complexity of a feeder network, only the current excitation and phase excitation of some array elements are changed to realize the conversion between the sum and difference beams. The method includes the steps of using an improved iterative Fourier algorithm to derive unit current excitation values corresponding to sum and difference beam patterns satisfying performance requirements of the sidelobe level, 3dB beam width and the like, retaining the amplitude of the same excitation unit portion corresponding to the two beams, and then, using an improved quadratic programming algorithm to find an array element excitation value outside a common excitation unit set to satisfy respective performance requirements of the sum and difference beams, including the maximum value of the sidelobe level, the slope of a zero position of the difference beam, the directionality coefficient, and so forth. The method of the invention realizes the conversion between the sum and difference beams only by changing the current excitation and the phase excitation of some array elements under the premise that the complexity of the feeder network is reduced.

The invention relates to a dual-beam three-antenna radar and a method for detecting traffic information of a microwave. In the radar based on a frequency modulation continuous wave (FMCW) system, a same voltage control oscillator (VCO) is adopted to implement a relevant dual-path microwave signal through a radio frequency switch and realize accurate traffic information detection in combination with a special algorithm; in the hardware aspect, a millimeter wave of which the central frequency is 24.1GHz or so is adopted; and the radar mainly consists of three planar array antennas and five units, namely two paths of microwave emission units, a path of microwave receiving unit, two paths of middle frequency signal processing units, a digital signal unit and a human-machine interface. By adoption of a dual-beam three-antenna technology and an ingenious design of a transceiver component, the use of a microwave singlechip integrated circuit chip is reduced to the maximum extent, so the cost is saved; furthermore, in the scheme, the advantages of a laterally installed microwave radar is kept, and a real-time speed, a running direction and the type of a vehicle can be detected accurately; and the interference resistance capability of adjacent vehicles is improved.

The invention discloses an integrated design method of array antenna radiation and scattering performances based on an installation height. The method comprises the following steps: determining structural parameters and electromagnetic working parameters of a planar array antenna; determining a rectangular grid circular aperture array configuration; calculating a cell radiation pattern function and a cell scattering pattern function; giving an initial installation height value; calculating the installation height in the direction z; calculating a radiation pattern function and a gain pattern function under the installation height in the direction z, as well as a gain loss amount relative to the ideal situation; calculating a scattering pattern function and an RCS (Radar Cross-Section) pattern function under the installation height in the direction z, as well as an RCS reduction amount relative to the ideal situation; judging whether the radiation and the scattering performances meet that the RCS reduction amount is the maximum when the gain loss amount is the minimum or not under the installation height in the direction z, if not, updating the installation height in the direction z and repeatedly calculating until the demand is met.

The invention discloses a high gain dual-frequency dual circularly polarized common-caliber planar array antenna which comprises a radiation array (1), a first frequency power divider (2) and a second frequency power divider (3), wherein the first frequency power divider (2) and the second frequency power divider (3) are respectively connected with the left end and right end of the radiation array (1). The high gain dual-frequency dual circularly polarized common-caliber planar array antenna has good polarization isolation and high frequency isolation.

Provided are a microstrip stack patch antenna using multilayered metallic disk array and a planar array antenna using the same. The microstrip stack patch antenna of the present research concentrates beam patterns and acquires a high gain characteristic by finitely depositing metallic disks in a bore-sight on a conventional microstrip stack patch radiator. The microstrip stack patch antenna includes: a microstrip stack patch directly connected to the feed line; and a mask conductor layer for improving side lobe and gain characteristics, the mask conductor being formed on the microstrip stack patch.

For phased array aperture shading for sidelobe reduction in satellite communication transceivers, apparatus and systems are disclosed. One apparatus includes a planar array antenna tile having a plurality of patch antenna elements. The apparatus also includes a transmit feed point that drives the planar array antenna tile. The apparatus further includes a feed network element that distributes power unequally among two or more of the patch antenna elements, wherein the feed network element connects the two or more patch antenna elements to the transmit feed point.

The invention discloses an integrated cascading optimization method for a large-scale planar array antenna pattern, and the method employs a mixed optimization algorithm, which integrates an IFT (iterative Fourier transform) method with a plurality of intelligent optimization algorithms, for the comprehensive design of the planar array antenna pattern. Moreover, the method gives the consideration to impact from mutual coupling factors among antenna units. Aiming at the comprehensive design of a planar array, especially a large-scale planar array antenna (the number of units is greater than 100), the method is high in calculation speed, is high in calculation precision, and is good in universality.

The invention provides a C-band polarization-reconfigurable microstrip planar array antenna in the technical field of communication. The C-band microstrip planar array antenna comprises three dielectric substrates. A polarization-reconfigurable network comprises a 3dB directional coupler and two one-from-two RF switches. Through switching on or switching off the one-from-two RF switches, a working polarization manner in operation of the antenna can be freely selected. Through using the polarization-reconfigurable network, characteristics of horizontal polarization, vertical polarization, left-handed circular polarization and right-handed circular polarization in the antenna can be realized. The C-band polarization-reconfigurable microstrip planar array antenna has advantages of high gain, low profile, small size, high directional diagram consistency, etc. The C-band polarization-reconfigurable microstrip planar array antenna can be used in satellite and radar communication and some application occasions where multipolarization and miniaturization are required.

The invention discloses a near-field focusing planar array antenna which is high in efficiency, small in size and low in cost. The near-field focusing planar array antenna comprises a first copper-coated metal layer, a first medium layer, a second copper-coated metal layer, a second medium layer, a third copper-coated metal layer, a third medium layer, a fourth copper-coated metal layer, a fourth medium layer and a fifth copper-coated metal layer, wherein the first copper-coated metal layer, the first medium layer, the second copper-coated metal layer, the second medium layer, the third copper-coated metal layer, the third medium layer, the fourth copper-coated metal layer, the fourth medium layer and the fifth copper-coated metal layer are sequentially laminated from top to bottom. Metallized radiation holes are formed in the first medium layer. Metallized phase shift holes are formed in the second medium layer. Metallized transition holes are formed in the third medium layer. A substrate-integrated waveguide parallel feed network is arranged on the fourth medium layer. According to the near-field focusing planar array antenna, phase compensation is achieved through the metallized phase shift holes, the compensation range is wide, the structure is simple, performance is excellent, efficiency of the antenna is high, the size of the antenna can be greatly reduced, and cost can be reduced; in addition, different focusing positions can be adjusted. The near-field focusing planar array antenna is suitable for being popularized and applied in the technical field of microwave antennas and millimeter wave antennas.

Disclosed herein is a multilayer planar array antenna. The antenna includes a waveguide, a first dielectric layer, a radiating unit, a second dielectric layer, parasitic elements, and a feeding cover unit. The waveguide is configured to transmit signals. The first dielectric layer stacked on the waveguide. The radiating unit is formed in such a way that a plurality of radiating elements and a plurality of radiating element feeding portions, which are arranged on the first dielectric layer, are formed thereon, so that a dually polarized wave is transmitted and received in a single plane. The second dielectric layer is stacked on the radiating unit. The parasitic elements are formed on the second dielectric layer to correspond to the respective radiating elements. The feeding cover unit is formed on the parasitic elements to correspond to the plurality of radiating element feeding portions.

The invention discloses a planar array antenna active scattering directional diagram predication method. The method comprises the following steps: (1) dividing a large-size planar array scattering field into a plurality of small-size planar sub-array scattering fields according to an active directional diagram method; (2) establishing a BP neural network correction model, wherein the structure of the BP neural network correction model is divided into three layers: an input layer, a hidden layer and an output layer; calculating an output error; carrying out reversed feedback on a difference value of an output result and delta, and sequentially revising a revising amount of a weight according to an error gradient descent method; carrying out model training and finishing the training after a network reaches a convergence target or pre-set iteration times; and applying the active directional diagram method based on the trained neural network correction mode to supply a scattering directional diagram of the large-size planar array. By the aid of the planar array antenna active scattering directional diagram predication method, an optimization algorithm of a neural network is used for optimizing a traditional active scattering directional diagram predication method of an array antenna; the error control can be carried out better, and a predication way is provided for grasping the scattering directional diagram of the large-size planar array.

The invention discloses a programmable controlled reconfigurable antenna based on cross PIN diodes. The programmable controlled reconfigurable antenna comprises a servo circuit, a programmable voltage source and an antenna array, wherein the antenna array consists of M rows and N lines of cross PIN diodes; the servo circuit is used for controlling the programmable voltage source through programs and used for enabling the programmable voltage source to output multiple paths of voltage which meets the programming requirements; the multiple paths of the voltage output from the programmable voltage source are connected with corresponding cross PIN diodes in the antenna array, and are used for controlling the PIN diodes on different arms of the cross PIN diodes to be communicated and powered off, and used for achieving a programmable controlled frequency reconfigurable antenna, a programmable controlled directional diagram reconfigurable antenna and a programmable controlled straight line antenna or a planar array antenna. The programmable controlled reconfigurable antenna based on the cross PIN diode can be realized.