| Microstrip antennas have been used in many applications in recent years. This popularity is due to their inherent advantages like lightweight,thin profile and easy manufacturing,packaging,and installing. Now, many successful Microstrip antenna array designs have been used in various kinds of systems already, this makes my design realistic and feasible. The task of this project is to design millimeter-wave microtrip array antenna with low loss feed network. The first part of the article includes analysis and design of array elements. Chapter one is preface, introducing research background. The characteristics and status quo of microstrip are discussed in research background. In chapter two, rectangular microstrip antenna has been analyzed by transmission-line and modal-expansion cavity models. K-J dispersion model is used to revise effective relative permittivity and impedance,this made the design of microstrip more accurate. In chapter three, puts forward KEFF arithmetic to compute the physical dimensions of rectangular microstrip antennas.At last,single rectangular microstrip element has been designed successfully. The second part of the article completes the design of four elements microstrip array,the measured results are compared with the simulation results of Ansoft HFSS, most of which are shown to be in good agreement. This shows that Keff arithmetic is feasible in computing the physical dimensions of rectangular microstrip antennas.A method of calculating the overall losses of MM-wave microstrip array antenna has been put forward based on the analysis of microstrip feedline loss. The parallel/series feed network of 256 elements for the array's uniform power distribution are designed particularly,,also shows the photograph of 35-GHz full microstrip array with 256 elements.The measurement shows that the resonant frequency is 35GHz and the gain of 28.05dB can be obtained, this arrives at the advanced degree in the world. |
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