|
In recent years, with the development of radar, electronic warfare and communication technology development, the antenna is widely used. Therefore, the performance of the antenna, in particular to the volume of the antenna and the operating band, weight, etc. to put forward more, taller requirement. Plane printed antenna because of its light weight, small size and simple manufacture, strong ability of radiation has been studied extensively. So how to design compact structure and the printed antenna with broadband characteristics has become a hot spot of research. Planar Quasi-Yagi antennais a broadband antenna, it inherits the Yagi antenna radiation and strong advantages, but also can be used to the high dielectric constant dielectric material, so that the size of the antenna is obviously reduced; more important is that it has a planar structure, easy array, to facilitate the realization of multi frequency band. This article will focus on this kind of antenna.In this dissertation the proposed multi-band Quasi-Yagi antenna based on the printing surface, is proposed by adding a plurality of oscillator to obtain multi-band design method. Using this method, and designs a load of irregular line of compact four band planar printed antenna, its size is 130 x 130 x 1mm, good coverage of the 600MHz, 1200MHz, 1950MHz, 2300MHz and multiple band. This paper first uses the electromagnetic simulation software for structural modeling, studies the existing literature have raised Quasi-Yagi antenna performance; then, through the thorough analysis of the structural parameters on the performance of the impact foundation, put forward to increase the meander line method, in order to achieve the desired band, and produced the corresponding real. The test results show that, this paper presents the design method is effective, in order to realize multi band antenna provides a new train of thought.The thesis is divided into five chapters .The first chapter is introduction; The second chapter introduces the basic knowledge of antennas; The third chapter introduces the existing literature in plane Quasi-Yagi antenna performance and its simulation; The fourth chapter introduces the improved compact plane Quasi-Yagi antenna simulation study; The fifth chapter introduces the improved plane Quasi-Yagi antenna implementation.At the end of this thesis, alignment Yagi antenna simulation and experimental study of contrast, analysis, summarized the research conclusions, and put forward the prospects for future work.
|