Bandpass Frequency Selective Structure With Improved Out-of-Band Rejection Using Stacked Single-Layer Slotlines

In this paper, a class of bandpass frequency selective structures (FSSs) with improved out-of-band rejection is proposed by using stacked slotlines. The proposed FSS consists of a periodic array of slotlines etched in pieces of single-layer printed circuit boards, which are vertically placed along t...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2018-11, Vol.66 (11), p.6003-6014
Main Authors: Li, Bo, Huang, Xin, Zhu, Lei, Zhang, Yixiong, Tang, Yiming, Lu, Wen-Jun, Bo, Yaming
Format: Article
Language:English
Subjects:
Bandpass filters
Circuit boards
Filtering
Frequency selective structure (FSS)
Frequency selective surfaces
Impedance
periodic structure
Propagation modes
Rejection
Resonant frequency
Resonators
Slot lines
slotline
stepped-impedance resonator (SIR)
Three-dimensional displays
Transmission lines
Unit cell
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Summary:In this paper, a class of bandpass frequency selective structures (FSSs) with improved out-of-band rejection is proposed by using stacked slotlines. The proposed FSS consists of a periodic array of slotlines etched in pieces of single-layer printed circuit boards, which are vertically placed along the periodic plane and then stacked together with a certain distance. Due to this special arrangement, slotline resonators are constructed based on the desired propagation modes, thus leading to a stable bandpass filtering response in a wide frequency range. To better understand the operating principle, design procedure of this class of FSSs with uniform slotline unit cells, inductor-loaded uniform slotline unit cells, and stepped-impedance slotline unit cells is presented step by step. In particular, the equivalent transmission line models are established and the even-odd mode analysis method is introduced to intensively analyze the resonant and filtering mechanisms. As two examples, a single-polarized FSS and a dual-polarized one, both based on stepped-impedance slotline unit cells, are designed, fabricated, and measured. Measured results indicate that the proposed FSSs feature miniaturized unit-cell size, wide upper rejection band, and stable frequency filtering response under a large variation of incident angles.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2018.2866529