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Design and Experimental Verification of Compact Frequency-Selective Surface With Quasi-Elliptic Bandpass Response

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5 Author(s)
Guo Qing Luo ; Hangzhou Dianzi Univ., Hangzhou ; Wei Hong ; Qing Hua Lai ; Ke Wu
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A compact frequency-selective surface (FSS) having a quasi-elliptic bandpass response is presented in this paper. This was realized by vertically cascading substrate integrated waveguide (SIW) cavities. A single SIW cavity FSS has been fully studied and approximate analytical formulas are introduced to calculate its resonant frequencies. Two different resonances can be excited by a plane wave in the single SIW cavity FSS. According to theories of the cascading cavity filter and dual-mode filter, cross coupling can be realized in cascading SIW cavity FSSs, thus a compact FSS with a quasi-elliptic bandpass response is implemented. A Ka-band sample was fabricated by a printed circuit board (PCB) process. Experiments were carried out to validate this design method. Measured results are in agreement with predicted ones. The proposed quasi-elliptic FSS presents a number of advantages, namely, high selectivity, stable performance, and much reduced volume.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:55 ,  Issue: 12 )