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Using FDTD Method to Analyze a Single Ridged Waveguide Antenna for Near Field Measure and the Optimization Reaserch of MEMS Phase Shifter

Author: HuangLe
Tutor: ZhuShouZheng
School: East China Normal University
Course: Radiophysics
Keywords: Single ridge waveguide antenna Finite difference time domain method Steel source Perfectly matched layer Genetic Algorithms Varying Population Size Climbing method Micro-electro-mechanical systems Phase shifter
CLC: TN820
Type: Master's thesis
Year: 2002
Downloads: 155
Quote: 0
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Abstract


In this paper, the FDTD method and the microwave transmission line theory on a near-field measurements were analyzed in the S-band single - ridge waveguide antenna . [1] have some ridge waveguide the FDTD numerical solution in order to get the infield of the ridge waveguide characteristics of this article is to analyze the S-band ridge waveguide antenna radiating near-field measurements rubber absorbing material . In the rubber material measurement resolution requirements results can not be used microstrip antenna sensor . The waveguide antenna sensor in low frequency attenuation smaller size is too large to meet the requirements . The ridge waveguide antenna is compared with the ordinary metal waveguide , can have a smaller size of the work in the low frequency domain , and thus can achieve high resolution , and easy connection with a coaxial feeder , it is suitable for measurement of the absorbent material used in rubber in . A characteristic of this article is to discuss some of the FDTD algorithm improvements , such as the pulse source of steel processing, making the waves pass freely through the original is totally reflected at the source of the steel . Calculation regions change with time , using the FDTD calculation of the spatial point adjacent areas of different size in different time step , so that the only wave propagation area is calculated , so that the computation time can be shortened . The genetic algorithm is applied to the millimeter-wave micro-electro-mechanical systems (MEMS) phase shifter design and optimization is an important part of this thesis . According to the characteristics of the millimeter - wave micro- mechanical systems , discussed some improvements of the genetic algorithm is proposed with varying population size , combined with climbing law hybrid genetic algorithm ( VPSG_GM ) . Variable Population characteristics of the algorithm is that each process of evolution, the size of the population due to the degree of evolution and automatically adjust the size, in order to ensure appropriate selection pressure and area optimization climbing method , the results prove it faster than conventional genetic algorithm higher efficiency. Optimized design , and finally gives an example of a high-performance work in the millimeter wave MEMS phase shifter .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Antenna > General issues
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