40 results about "Antenna geometry" patented technology

The production and emission of high-energy microwave pulses are made possible by means of a device with a particularly compact design if the capacitor column (12-12) of the Marx generator (11) whose series circuit conventionally itself feeds a microwave generator with a matched antenna geometry, is now itself used—dispensing with the microwave generator and its antenna—directly as a resonator and Hertzian antenna dipole (24). Its oscillation response can be optimized by triggered spark gaps (14) for the switching of capacitors (12), and by means of plates (19) connected at the ends, in order to increase the stray capacitances.

The invention discloses a layout method of a short-distance planar array MIMO imaging antenna, comprising: step S1: determining the shortest effective synthetic array size and the size of the planar array element antenna of the imaging system; step S2: determining the minimum distance between the centers of the receiving and transmitting antennas of the same type; step S3: Determine the total number of transceiver elements and the size of the minimum composite array of the imaging system; Step S4: Calculate the total number of transceiver elements of the imaging system, the number of antenna equivalent phase centers, and the planar array size of the imaging system; Step S5: Calculating the distribution of the geometric center positions of the transmitting and receiving array element antennas of the imaging system; Step S6: performing layout according to the distribution of the geometric center positions of the transmitting and receiving array element antennas of the imaging system. The layout method of the present invention solves the problem that the effective synthesis array length is affected by the observation distance in planar array MIMO imaging, and further improves the data acquisition efficiency on the premise of ensuring the quality of short-distance microwave images.

An improved RFID tag reader is provided. More specifically, an RFID tag reader is provided that includes a plurality of antenna panels arranged to form a sensing volume in which RFID tags are read. Additionally, the RFID tag reader includes a novel switching mechanism that activates the antenna panels in sequence while minimizing cross coupling between the antenna panels. Furthermore, a novel antenna geometry also reduces antenna cross coupling.

The invention discloses an electromechanical integration optimization design method for an umbrella-shaped antenna under an optimal focal distance. The method comprises the steps of inputting a geometrical parameter, a material parameter and an electrical parameter of the umbrella-shaped antenna; calculating the optimal focal distance of the umbrella-shaped antenna; calculating an ideal antenna far electric field under the optimal focal distance; calculating the number of segments of antenna ribs; calculating coordinates of points on the ribs; calculating the coordinates of the points between the adjacent ribs; generating all node coordinates of the umbrella-shaped antenna; establishing a structure finite element model of the umbrella-shaped antenna under the optimal focal distance; generating first-order and second-order coefficient matrixes of total electrical property under the optimal focal distance; solving the structure finite element model under the optimal focal distance; approximately calculating a variation of the far electric field of the umbrella-shaped antenna under the optimal focal distance; calculating the far electric field of the umbrella-shaped antenna under the optimal focal distance; judging whether the electrical property meets the requirement; outputting an antenna structure design scheme; and updating the antenna parameters. According to the method, surface patch splicing characteristics of the umbrella-shaped antenna are considered, the electrical property under the optimal focal distance is acquired based on a second-order approximate calculation formula, and the electromechanical integration optimization design efficiency can be improved.

The invention discloses a MIMU / rotating Beidou short-baseline dual-antenna positioning and orientation device, which includes a rotating mechanism module, a BDS module, an MIMU module, and a main control navigation module. The rotation mechanism module consists of a single-axis motor, an encoder and a bracket. The bracket rotates forward and backward 180° continuously under the control of the motor, and the encoder outputs rotation angle data; the BDS module includes two Beidou antennas and BDS boards; two The Beidou antenna is installed on the bracket driven by the motor to continuously rotate forward and backward 180°, and the BDS board outputs the original data information such as the position, velocity, ephemeris data and carrier phase of the geometric center of the two antennas; the MIMU module is placed on the On the base of the positioning and orientation device; the main control navigation module is composed of FPGA and DSP. The device of the present invention can obtain the heading angle without calculating the ambiguity of the whole circle through the short baseline dual antenna and the rotating mechanism to rotate forward and backward by 180°, so as to realize positioning and orientation. The device of the invention has the advantages of small size, low cost and high precision.

The invention discloses an electrical property time-domain characteristic analysis method of a mesh antenna on the basis of an approximate calculation formula. The method comprises the following stepsthat: (1) inputting antenna geometric parameters, material parameters and electrical parameters; (2) establishing an antenna structure finite element model; (3) extracting node, unit and shape function information; (4) calculating electrical property one-order and second-order coefficient matrix; (5) applying a dynamic load; (6) calculating node displacement information; (7) calculating node speed information; (8) calculating node accelerated speed information; (9) carrying out approximate calculation on antenna far field electric field change speed time domain information; (10) carrying outapproximate calculation on the far field electric field change speed time domain information; (11) judging whether the electrical property meets requirements or not; (12) outputting an antenna structure design scheme; and (13) updating an antenna parameter. On the premise that calculation is guaranteed, the calculation of reticular antenna far field electric field change speed and the acceleratedspeed time domain time information can be realized, and the electromechanical integrated operation design of an antenna structure is realized.