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Abstract
A novel frequency selective surface (FSS)-based spatial bandpass filter for TM-polarized waves is reported. The unit cell of the proposed FSS consists of a dielectric substrate with two conducting layers on opposite sides. One magnetic resonator is placed on the top conducting layer, while two pairs of electric resonators are positioned on the bottom conducting layer to provide a fast roll-off bandpass characteristic. The simulated values of the −3 dB to −10 dB roll-off factor (RF) for the proposed structure are 140 and 280 dB/GHz on the lower and upper sides of its passband, respectively. To validate the simulation results of the proposed structure, a prototype of the FSS-based filter was fabricated and tested experimentally. Furthermore, the present simulation results are benchmarked with the band-pass FSSs reported in the literature, demonstrating an advantage of the proposed filter over the filters mentioned in previous works.
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No potential conflict of interest was reported by the author(s).
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Notes on contributors
Gundu Venkatesh
Gundu Venkatesh (Student Member, IEEE) received the B.Tech. degree in electronics and communication engineering from Jawaharlal Nehru Technological University Hyderabad, Hyderabad, India, in 2012, and the M.Tech. degree in microwave engineering in 2016 from the Indian Institute of Technology (BHU) Varanasi, Varanasi, India, where he is currently pursuing the Ph.D. degree in microwave engineering. His current research interests include the design of frequency-selective surfaces which can be used in microwave shielding, space, and defense (stealth and anti-stealth) applications.
Surya Pal Singh
Surya Pal Singh (Life Senior Member, IEEE) was born in Mirzapur, India, on January 12, 1951. He received the B.Sc., B.Tech., M.Tech., and Ph.D. degrees in electronics engineering from Banaras Hindu University (BHU), Varanasi, India, in 1971, 1976, 1979, and 1989, respectively. In 1980, he joined the department of electronics engineering, IT, BHU [now IIT (BHU)], Varanasi as a lecturer and superannuated on January 31, 2016, as a professor (HAG). He is currently associated with the department of electronics engineering, IIT BHU and is actively involved in research activities related to bioelectromagnetics/microwave antennas/measurements/telemedicine. Prof. Singh is a Life Fellow of IETE (India).
M. Thottappan
M. Thottappan (Senior Member, IEEE) received a Ph.D. degree in microwave engineering from the IIT (BHU) Varanasi, Varanasi, India, in 2013. He is currently working as an associate professor with the department of electronics engineering, IIT (BHU) Varanasi. His research interests include metamaterial, metasurfaces, frequency-selective surfaces, millimeter-wave components and devices for 5G and beyond applications, and high-power microwave sources and their subassemblies.