| With the rapid development of communication technology, the multi-band communication is becoming a hot research topic. The research of multi-band frequency selective surface (FSS), which is one of the most important components of communication systems, has also attracted much attention in the world. Based on the dual-band characteristic of complementary structure, several multi-band FSS structures are designed and analyzed in this dissertation. The applications of FSS on the design of filter and diplexer are also investigated. The main contributions of this dissertation are listed as follows.1. After analyzing the performance of the FSS with closed loop and its complementary pattern, a miniaturized dual-band FSS is proposed by loading lumped capacitance and inductance elements on the traditional complementary FSS. Based on combing the complementary structure with aperture resonators or spatial lumped elements, two tri-band FSS structures are firstly designed. Furthermore, a quad-band FSS is proposed by using two complementary square loops. Similarly, a miniaturized quad-band FSS is also realized by loading lumped elements. All equivalent circuit models of the proposed FSS structures are given for analyzing their working mechanism.2. Because of the high selectivity of the substrate integrated waveguide-cavity FSSs (SIW-Cavity FSS), they are combined with rectangular waveguide to construct waveguide filters with high performance. Based on the low temperature co-fired ceramic (LTCC) technology, a60GHz quasi-elliptic bandpass waveguide filter and a60GHz diplexer with planar structure are firstly proposed.3. Two common measuring methods are introduced briefly in this dissertation. Based on the actual measurement of the proposed multi-band FSSs, the advantages and disadvantages of the two methods are listed and compared with each other, and their own using conditions are also summed up, which can provide potential guidance to the measurement of some FSS structures. |
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