微帶天線與微帶天線陣的CAD公式.pdf

1、The topic of this thesis is to develop accurate and efficient CAD ofrmulas for microstrip antennas tna their arrays.The formulas are constructed based on the physical insight of the circuits,through the application of ex

2、isting methods,commercial software,and the idea of Fuzzy EM.Analysis and design of large microstrip antenna array with the aid of software IE3D are investigated.The input impedance is obtained through the loading method,

3、and antenna gain is accurately estimated throuth considering the losses on feed network.Stub tuning for impedance matching of the array is conducted,with the optimization of Genetic Algorithm combined with Neural Network

4、s.The analysis and design based on full wave computation require large computer source and are time consuming.Theerefore,accurate and efficient CAD formulas for microstrip antenna and its array are investigated.A Success

5、ive approach method to solve the response of an irregularly shaped patch is developed.In this method,we starts from an ideal regular shaped patch,which could be easily analyzedby fast and accurate 2D model expansions,the

6、 error is reduced by successive approach through adding the perturbation of cutting the corner,adding fringing field,and by applying Cauchy's interpolation to eliminate instability,find wide band response.A CAD formula f

7、or thix extension is derived from DC capacitor and is shown to be applicable for all practical thickness and permittivity ε<,r> of the substrate.The frings field effect is equivalently considered as an extension in size

8、of an RF patch,either as resonator or as antenna.Resonant frequency of patch antenna on thick substrate is discussed.It is demonstrated that with the correct definition,our formula gives more accurate prediction compared

9、 to other existing formulas.A formula for mutual impedance between patch antennas is constructed based on the physics of the static near field and the radiation far field of the couplings.This leads to a synthetic asympt

10、ote form of separated variables of the center-to-center distance r and the azimuth angleφ.The formula is accurate and complete,with no restriction on the detailed structures of patch,feed and substrate.As its application