期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 70, 期 4, 页码 2790-2800出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2021.3138256
关键词
Frequency selective surfaces; Microwave filters; Band-pass filters; Resonator filters; Spatial filters; Resonant frequency; Wideband; All-metal structures; bandpass response; frequency selective surface (FSS); laser technology; low-cost fabrication; metasurface; modular reconfigurability; polarization independence; radar; radome; space explorations; TE and TM polarizations; wideband
资金
- Macquarie University Research Fellowship Grant
- University of Technology Sydney, Faculty of Engineering and Information Technology (IT) Strategic Start-Up Grant
This article presents a novel technique for designing a low-cost frequency-selective surface (FSS) bandpass filter. The proposed filter has a large controllable operational frequency band and can support all polarizations. The filter's characteristics are verified through circuital and modal analyses, and simulated and measured results show low sensitivity to different polarizations and oblique angles of incidence.
A novel technique to design a low-cost frequency-selective surface (FSS) bandpass filter is presented in this article. Wideband polarization-independent FSS bandpass filters are predominantly made of multiple microwave dielectric substrates or noncommercially available composite materials with or without active components, contributing to a very high manufacturing cost. The presented FSS filter has neither microwave substrates, nor any active devices, while it has a large controllable operational frequency band, which can support all polarizations, due to its symmetrical configuration. To the best of our knowledge, such a polarization-independent wideband bandpass response has never been achieved by any low-cost fully metallic FSS filter. The proposed FSS filter is made of three thin metal sheets composed of an engineered metallic substrate (EMS) and a metallic orthogonal dipole resonator (ODR). The EMS is responsible for ensuring the mechanical integrity of the filter without imposing electromagnetic (EM) restrictions throughout the desired frequency band. The integration of EMS and ODRs realizes a fully controllable wideband bandpass verified thorough circuital and modal analyses. According to the predicted and measured results, the FSS filter has a large bandwidth of around 31%, extending from 8.76 to 11.96 GHz with sharp roll-offs for the normal incidence. Simulated and measured results show a low sensitivity of the FSS filter response to oblique angles of incidence for both TM and TE polarizations.
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