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In order to reduce the minimum antenna measurement distance, the aperture reduction is needed. While the aperture reduction will cause the gain of the antenna reduced. The method of loading the elongated dielectric rod on the rectangular waveguide can remarkably improve the gain of the antenna without increasing the antenna aperture. A simulation study was carried out on the antenna with a dielectric...
A major challenge for a combined reconfigurable antenna is to realize both polarization switching and beam steering independently in a compact antenna structure. A cavity-backed proximity-coupled reconfigurable microstrip antenna proposed in this communication provides an efficient solution. Beam lead p-i-n diodes DSM8100–000 are employed as switching elements to achieve reconfiguration. Three different...
Cassegrain antenna operating at millimeter-wave band is an attractive and low-cost choice for communication in moving and mono-pulse tracking system. In this paper, the design method of Cassegrain antenna, geometrical optics, is introduced. To miniaturize the axial dimension of the Cassegrain antenna, a disk which is low cost and easily produced, is proposed to replace the sub-reflector with the shape...
A dual-polarized conical dielectric resonator antenna with hybrid feed mechanism is presented. The design for the proposed antenna excitation structure consists of slot fed by a microstrip line and a coplanar waveguide (CPW), providing the orthogonal polarizations. Dual-polarization can be well matched with the common −10dB impedance bandwidth of 1180MHz (24.4%). The overall dimension of the proposed...
To improve the contour machining precision of XY table, the control strategy combining H∞ velocity feedback controller and Tangential-contouring Controller (TCC) was presented on the basis of analyzing the contour error of system. The H∞ control theory was used to design a feedback controller in order to guarantee robust stability and robust performance of the closed-loop system under the condition...
In order to improve the current precision of machining, a hydraulic micro-feed actuator for precision turning used in lathe or conventional CNC turning centers is introduced and the design formulas of important structure are given. The characteristics of the actuator such as displacement, natural frequency, cutting are researched by using the finite element analysis and experimental methods. The results...
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