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1、1 Zhongxiang ShenZhongxiang Shen School of Electrical and Electronic EngineeringSchool of Electrical and Electronic Engineering Nanyang Technological UniversityNanyang Technological University Singapore 639798Singapore 639798 Email ezxshen ntu edu sgEmail ezxshen ntu edu sg 3D Frequency Selective St
2、ructures Opportunities and Challenges 2 Acknowledgement Acknowledgement n n Dr Amir Khurrum Rashid a former student of mine Dr Amir Khurrum Rashid a former student of mine initiated the work reported in this presentation initiated the work reported in this presentation n n Dr Li Bo conducted extensi
3、ve investigations into the Dr Li Bo conducted extensive investigations into the concept of three dimensional frequency selective concept of three dimensional frequency selective structures structures n n Ms Zuo Yu of Nanjing University Mr Shang Yuping of Ms Zuo Yu of Nanjing University Mr Shang Yupi
4、ng of UESTC and Mr Huang Xiaoguo of SWJTU also UESTC and Mr Huang Xiaoguo of SWJTU also participated in this project participated in this project 3 Outline Background Brief Introduction to Frequency Selective Surfaces Limitations to Traditional Frequency Selective Surfaces Our 3D Frequency Selective
5、 Structures FSSs Description of the Structure Salient Features Equivalent Model Mode Matching Analysis Designed Examples Band stop FSSs Band pass FSSs Dual polarized FSSs Challenges and Future Work Definition a surface construction designed as a filter for plane waves Frequency angular response Band
6、 pass and band stop performances Typically a two dimensional periodic surface Design Parameters Element spacing Element shape Element dimensions Applications Radome Sub reflector Lens 4 What is Frequency Selective Surface 5 Two Typical FSSs Single layer Structures Patch inductive resonators Slot cap
7、acitive resonators 6 Disadvantages of Traditional FSSs Limited bandwidth based on one resonance Large cell size typically half a wavelength so that it can resonate This large cell size results in poor angular response Munk 1 used two slabs to alleviate the angular sensitivity Poor filtering response
8、 maximally flat or Butterworth type filtering response can be achieved 1 B A Munk Frequency Selective Surfaces Theory and Design John Wiley Sons Inc 2000 7 Multi Layered FSS Multi layered Structure wider bandwidth and steeper filtering response are obtained at the cost of a larger thickness 8 People
9、 have accumulated extensive knowledge in designing waveguide and microstrip filters that exhibit elliptical response Cross coupling 2 must be introduced in the filters so that an elliptical response steep roll off can be achieved The traditional stacking technique multi layered structure results in
10、a large thickness and forms direct coupled resonators and it is difficult or impossible to introduce cross couplings required for elliptical response Waveguides designs cannot be directly applied to FSS structures Disadvantages of Multi Layered FSS 2 S Amari and U Rosenberg IEEE Trans on Microwave T
11、heory and Tech vol 53 p 3135 3141 2005 9 Recently bandpass quasi elliptical FSS structures have been reported 3 4 using substrate integrated waveguide SIW It is a 2 5D structure and exhibits very good filtering performance 3 G Q Luo et al High performance frequency selective surface using cascading
12、substrate integrated waveguide cavities IEEE Microwave and Wireless Components Letters vol 16 pp 648 50 2006 4 G Q Luo et al Design and experimental verification of compact frequency selective surface with quasi elliptic bandpass response IEEE Trans on Microwave Theory and Tech vol 55 pp 2481 2487 2
13、007 Elliptical FSS Structures 3 D Frequency Selective Structures FSSs It is possible to include a number of higher order mode resonances N different paths can generate N reflection zeroes 5 Increased coupling to higher order modes results in high performance 5 R J Cameron Advanced coupling matrix sy
14、nthesis techniques for microwave filters IEEE Trans on Microwave Theory and Tech vol 51 pp 1 10 2003 Generalized Circuit Model 11 Our Proposed 3D Structure Description of Our New Structure Two dimensional periodic array of vertically placed printed transmission lines non resonant Can be easily fabri
15、cated using photolithographic technology 12 Advantages of Our Proposed FSS Due to its non resonant nature cell size can be electrically very small which results in very stable angular filtering response Because of the existence of multiple propagating modes quasi elliptical filtering response can be
16、 readily achieved Both band pass and band stop responses can be realized Tunable frequency selective structures can be easily implemented 13 Other 3 D FSS Designs 3 G Q Luo et al High performance frequency selective surface using cascading substrate integrated waveguide cavities IEEE Microwave and Wireless Components Letters vol 16 pp 648 50 2006 4 G Q Luo et al Design and experimental verification of compact frequency selective surface with quasi elliptic bandpass response IEEE Trans Microwave
