FSS를 이용한 MSF의 분석에 관한 연구

A Study on the Analysis of MSF using FSS

In this dissertation reports an experimental development of 4.9GHz and 12.25GHz microwave spatial filter using FSS(Frequency Selective Surface) method. In electric circuits, filters are one of the fundamental devices. In microwave engineering, the counterpart of a fiter is a frequency selective surface. Similar to the frequency fiters in traditional RF circuits, the FSS may have low-pass or high-pass spectral behavior, depending on the array element type. More recently, the capabilities of the FSS have been extended by the combination of other components or modules, For example, microwave oven, satellite sys tem, wireless power transmission system, and so on. In generally, Frequency selective Surface with square-loop element have been designed for single frequency band. Their resonant frequencies are fairly stable with respect to changes in incident angle and polarization. In addition the grid geometry is Symmetrical in the x and y direction. This implies that it is also good for circular polarization. In double square-loop elements has a same conditions as a square-loop element. But it has a multi-band frequency band characteristics. A frequency selective surface was designed using a basis function and manufactured using HMIC method. When applied FSS Structure, insertion loss was under 1dB as the passband and over 20dB as the stopband.These results should be useful for future wireless communication system design.