電機資訊學院: 光電工程學研究所指導教授: 邱奕鵬黃凡城Huang, Fan-ChengFan-ChengHuang2017-03-022018-07-052017-03-022018-07-052015http://ntur.lib.ntu.edu.tw//handle/246246/272703本論文提出新式圓形縮小化結構頻率選擇平面、非常接近雙頻頻率選擇平面以及可調變操作頻率的頻率選擇平面。新式圓形縮小化結構頻率選擇平面中提出圓形結構縮小化的設計，且同時具有其他優點，如對不同極化和入射角度都有穩定結果。非常接近雙頻頻率選擇平面的主要特點在於兩個操作頻段可以非常接近，可以更有效的利用頻寬。可調變操作頻率的頻率選擇平面則是提出了一個簡單可以調整操作頻率的方式。研究中首先會先利用數值模擬軟體HFSS (finite element method)進行S參數的分析，觀察不同入射角度及極化的頻率響應參數，再製作頻率選擇平面原型以實驗量測驗證模擬結果。Three topics of frequency selective surfaces (FSSs) are discussed in this dissertation: circular-ring miniaturized element (CRME) metasurfaces, very closely located dual-band FSSs and mechanically reconfigurable FSSs. CRME FSSs/metasurfaces are a new type of miniaturized FSSs with circular shapes in unit cells. They not only perform good miniaturization which is useful in applications with limited space but also show other good features such as stable frequency responses to different incident angles and polarizations at the same time. Very closely located dual-band FSSs present a design to shrink the ratio of two operating bands to be as small as 1.06. Also, an approach to fine tune the band ratio from 1.06 to 1.10 is proposed with the first band nearly fixed. These features enhance the usage of bandwidth of multi-band design, because the demands for communication bandwidth are increasing. Mechanically reconfigurable FSSs provide a method to change the operating frequency of FSSs by using a stretchable substrate. It is a passive and easy to implement approach in reconfigurable designs, making the FSS panel suitable for different bands. The periodicity of unit cells is changed by stretching the stretchable substrate. As a result, the coupling between unit cell elements is changed, so as the operating frequency. The full-wave solver, HFSS (finite element method), is applied to design the unit cell element of FSSs and examine performances of FSSs. Frequency responses with S parameters are investigated with respect to different incident angles and polarizations. Furthermore, the prototypes of the designed FSS are fabricated and tested in an anechoic chamber in order to verify the performances of FSSs.論文使用權限: 不同意授權頻率選擇平面新穎平面空間性的濾波器帶通濾波器縮小化電磁干擾電磁屏蔽雙頻帶阻濾波器週期性結構可調變頻率選擇平面Frequency selective surfacesMetasurfacesSpatial filtersBandpass filtersMiniaturizationElectromagnetic interferenceElectromagnetic shieldingDual bandBandstop filtersPeriodic structuresReconfigurable FSSsthesis