Dual-polarized third-order wideband bandpass frequency selective surface for X band and Ku band application

Abstract

A third-order dual-polarized elliptic wide passband Frequency Selective Surface (FSS) has been proposed in this article. The unit cell is comprised of Y-shaped fractal geometry integration on the tri-pole and evolved as the stub-loaded tri-pole (SLTP) structure on an ultra-thin FR-4 substrate (ϵ_r = 4.4). The novel back-to-back cascading approach of the aforesaid proposed design array with optimized air spacer enhances electromagnetic coupling, resulting in maximally flat and substantially wider third-order bandpass filtering capability. −3 dB passband filtering performance (8.3–20.1 GHz) and −1 dB transmission characteristics (8.9–19.8 GHz) encompass the X and Ku band spectral ranges. The elliptical transmission coefficient leads to a remarkable passband selectivity factor (SF = 0.91). Equivalent circuit models (ECM) have been mapped, and the prototype has been experimentally validated. Angular stability (θ ≤ 40°) for both TE and TM polarizations ensures the employability of the proposed FSS for the radome.

KEYWORDS:

• Dual polarization
• frequency selective surface (FSS)
• stub-loaded tri-pole (SLTP)
• third-order passband

Acknowledgements

The authors would like to acknowledge Prayukti Bhawan, University of Jadavpur, India for the measurements. The reviewers and the Associate Editor are also acknowledged by the authors for their insightful suggestions, which helped to make this paper better.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Srimita Coomar

Srimita Coomar has obtained her BTech and MTech degree in Electronics & Communication Engineering from MCKV Institute of Engineering under MAKAUT, WB in the year 2016 and 2018 respectively. Currently, she is associated with the Institute of Radio Physics & Electronics, University of Calcutta as a PhD (Tech) researcher. Her main research interests are Frequency Selective Surfaces, Microstrip Antenna under the domain of RF and Microwave.

Rajarshi Sanyal

Rajarshi Sanyal has obtained his AMIETE and MTech degree in Electronics and Communication. He earned his PhD in Engineering from the University of Kalyani. His area of research includes Microstrip Antenna, Microstrip Filters and Frequency Selective Surfaces. Presently, he is working as Assistant Professor in MCKV Institute of Engineering. He has presented and published various research papers in national and international journals.

Santanu Mondal

Santanu Mondal obtained his ME in ETCE from the University of Jadavpur and PhD in Engineering from University of Kalyani. He earned his BTech degree in ECE from Kalyani Govt. Engineering College under MAKAUT, WB. He is presently working as Assistant Professor in Institute of Radio Physics & Electronics, University of Calcutta. His area of research includes Planar Monopole Antenna, Circularly Polarized Microstrip Antenna, Frequency Selective Surfaces, Microwave Absorber. He has contributed to various research articles in various journals and conferences of repute.