Polarization insensitive multiband metasurface absorber for L, C, and X band applications

Abstract

An ultrathin, multiband, polarization insensitive with wide angle stability metasurface absorber having unitcell dimension $0.119{\lambda }_0\times 0.119{\lambda }_0\times 0.022{\lambda }_0$ ${\mathrm{mm}}^3$ is proposed ( ${\lambda }_0$ is the free space wavelength at 1.6 GHz). The four-fold symmetry of the unitcell makes it insensitive to TE and TM polarizations. This metasurface follows the sub-quarter wavelength thickness including an air gap of 2.5 mm and metal backing. The proposed unitcell of the metamaterial absorber (MMA) is designed by parametric optimization and has absorption peaks in L, C, and X bands. This absorber is suitable for applications like radar cross section reduction, isolation, and stealth technologies. The lumped SMD resistors are used to enhance absorption peaks simultaneously in all bands mentioned above. This metasurface has absorptivity of 95%, 99%, 97% & 94% at 1.6 GHz, 5 GHz, 7.5 GHz and 10.2 GHz respectively. This is a polarization-insensitive absorber showing stable absorption for different incidence angles between $0^{\circ }$ and ${90}^{\circ }$ at the above-given frequencies. The absorption effect has been studied by investigating the filter effect from the equivalent circuit modeling using surface current distribution and normalized impedance. The proposed structure has been fabricated and its measurement results agree well with the simulated one.

Keywords:

• Metasurface
• metamaterial absorber
• absorptivity
• ultrathin
• polarization insensitive

Disclosure statement

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

Additional information

Notes on contributors

Niten Kumar Panda

Niten Kumar Panda is presently continuing his PhD in School of Electronics, KIIT Deemed to be University, Bhubaneswar, India. He received BTech degree in Electronics and Telecommunication Engineering from BPUT, Rourkela and MTech in Communication Engineering from IIT Kharagpur. His academia research contour includes metamaterial inspired antennas, metasurface absorber, polarization converter and frequency selective surfaces. He is a student Member of IEEE AP/MTT Society and Life member of The Institute of Engineers (India).

Sudhakar Sahu

Dr Sudhakar Sahu is presently working as Professor, School of Electronics Engineering, KIIT Deemed to be University (Institute of Eminence), Bhubaneswar, Odisha, India. He received ME degree in Electronics and Telecommunication Engineering from Indian Institute of Engineering Science & Technology (IIEST) Shibpur, West Bengal, India and PhD (Engineering) degree in Electronics and Telecommunication Engineering from Jadavpur University, Kolkata, India. He is the author and coauthor of 101 articles in International Journals and Conference Proceedings. He has supervised ten doctoral theses. He has successfully completed three Government of India funded projects: one is AICTE, New Delhi and two BRNS-DAE, Govt. of India, Mumbai. His research interests and activities include dielectric resonator based MIMO antenna for cognitive radios, UWB antenna, SIW antenna, magneto-electric dipole antenna, hybrid fractal metasurface assisted antenna, microstrip filters, metamaterial/metasurface-based microwave components, and application of soft computing techniques in engineering. He is a Senior Member of IEEE AP/MTT Society, member of OPTICA, Fellow IE (India), Member IET(UK), and Life Member ISTE (New Delhi).

Sraddhanjali Mohapatra

Dr Sraddhanjali Mohapatra is presently working as Assistant Professor(II), School of Electronics Engineering, KIIT Deemed to be University, Bhubaneswar, Odisha, India.She holds a BTech degree in Electronics and telecommunication Engineering. She completed her Master and Ph.D from KIIT ,Deemed to be University,Bhbaneswar. She is now working in the field of Microwave engineering and IoT.