Saptarshi Ghosh

Saptarshi Ghosh
Indian Institute of Technology Indore | IITI · Department of Electrical Engineering

PhD

About

121
Publications
15,339
Reads
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2,834
Citations
Citations since 2016
89 Research Items
2693 Citations
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
Introduction
I am currently working as an Assistant Professor in the Discipline of Electrical Engineering at Indian Institute of Technology Indore, India. Prior to joining here, I had worked as a Postdoctoral researcher in Chung-Ang University at Seoul, Republic of Korea. My Postdoc advisor was Prof. Sungjoon Lim. I have completed my Doctor of Philosophy (Ph.D.) from Department of Electrical Engineering at Indian Institute of Technology Kanpur, India. My Ph.D. supervisor was Dr. Kumar Vaibhav Srivastava. My research interest includes frequency selective surface (FSS), metamaterial, microwave absorber, microlfuidic technology, periodic structures, laser etching.
Education
July 2005 - June 2009
Indian Institute of Engineering Science and Technology, Shibpur
Field of study
  • Electronics and Telecommunication

Publications

Publications (121)
Article
In this letter, a dual-polarized dual-transmission frequency selective rasorber (FSR) geometry is demonstrated. The top layer of the FSR is built of a cross-dipole design loaded with chip resistors for obtaining a wideband absorption. In addition, two different split ring resonator patterns are printed at each side of the substrate connected by met...
Article
Full-text available
A polarization‐insensitive frequency‐selective rasorber (FSR) with wideband absorption and in‐band transmission characteristics has been presented and investigated in this letter. The unit cell of the proposed FSR comprises one lossy and one lossless resonator, both printed on FR4 substrates and segregated by an air spacer. Resistive ink patterns a...
Article
Full-text available
This article proposes an active frequency selective surface (FSS) with application to satellite multi‐band antennas in X and Ka bands. The FSS offers two reflective bands at 20 and 30 GHz (downlink and uplink frequencies of broadband communication satellites in Ka‐band) under one biasing state, whereas the frequency characteristics are switched in...
Conference Paper
Full-text available
In this work, an active frequency selective surface (FSS) is proposed for multiband space antennas in X and Ka bands. The FSS offers three reflection bands at 20 and 30 GHz (uplink and downlink frequencies of Ka-band satellites) and presents a switchable passband at 10 GHz. The FSS unit cell is made up of three metallic layers, and four PIN diodes...
Article
Full-text available
In this letter, a miniaturized triband printed monopole antenna with circular polarization (CP) characteristic has been designed and demonstrated. The proposed geometry is comprised of two orthogonal stubs and one meander pattern on the top layer and a defected ground plane. By carefully designing the top and bottom layer topologies, the antenna is...
Article
In this letter, a polarization-insensitive absorptive/ transmissive reconfigurable frequency selective surface (RFSS) using p-i-n diodes is presented. The RFSS structure incorporates two periodically arranged metallic patterns on both sides of an FR4 dielectric substrate, where the p-i-n diodes are aligned symmetrically on the bottom surface. Depen...
Conference Paper
Abstract—A low-profile microstrip patch-fed cylindrical dielectric resonator antenna (CDRA) is presented in this paper. The antenna geometry is composed of two different dielectric resonators (DRs) and a microstrip-fed triangle-shaped patch element. A Three-dimensional (3-D) printing technique is used to fabricate one set of DR from Polylactic acid...
Article
In this letter, a miniaturized-element dual-polarized frequency selective rasorber (FSR with independently regulated dual-transmission response has been presented. The proposed FSR is made of two cascaded layers separated by an air spacer, where the top lossy layer provides wideband absorption along with in-band transmission and the bottom lossless...
Article
In this paper, a compact triple-band printed monopole antenna with circular polarization (CP) has been presented for C-band wireless applications. To achieve the triple-band CP response, the top layer of antenna geometry consists of a meander structure and two orthogonal stubs, whereas a ground plane consists of a vertical slot. The 10-dB impedance...
Conference Paper
This contribution presents a reconfigurable frequency selective surface (FSS) for shared-aperture satellite antennas in X and Ka bands. The FSS has been designed to be reflective at 20 and 30 GHz (transmit and receive frequencies in Ka-band) and to allow switching of transmission and reflection responses in X-band (between 9 and 12 GHz). The FSS un...
Article
Full-text available
In this article, a polarization‐insensitive broadband multilayer circuit analog absorber has been designed and demonstrated. The proposed structure is comprised of two layers, each layer being made of resistive square loop geometries printed on low‐cost FR4 substrates. The substrates are separated from each other by an air spacer and the overall ge...
Article
A polarization-insensitive broadband absorber with a notch band characteristic has been presented for radar cross section reduction applications. The proposed design is a three-layered structure, consisting of metal-printed substrate layers separated by air spacers. The top layer is a resistor-loaded convoluted cross-dipole geometry that results in...
Article
Full-text available
In this letter, a polarization‐insensitive broadband rasorber structure with in‐band transmission response has been presented. The proposed structure comprises a periodic arrangement of convoluted cross‐dipole pattern in the top layer and square slot geometry in the bottom layer. Lumped resistors are symmetrically mounted across the top pattern to...
Article
In this letter, a dual-band tunable bandstop frequency selective surface, capable of exhibiting independent tuning for top and bottom layers, has been presented. The proposed design comprises periodic patterns of cross-diagonals printed on the opposite sides of a thin substrate, where the varactor diodes are mounted symmetrically. Both the layers u...
Article
Full-text available
In this paper, a low‐cost metamaterial (MM) absorber is proposed using 3‐dimensional (3D) printing technology. The unit cell of the proposed MM absorber is motivated from a swastika symbol to minimize the footprint size. For further miniaturization, the unit cell is 3D printed by stacking two blocks. The conductive top patterns are realized by pain...
Article
This paper realized a polarization-insensitive active frequency selective surface (AFSS) that simultaneously exhibited mode switching and frequency tunable capacity. The geometry comprised periodic metallic patterns printed on opposite sides of a dielectric substrate, with varactors and PIN diodes mounted on the top and bottom layers, respectively....
Article
This paper proposes a miniaturized element bandpass frequency selective surface using three-dimensional (3D) printing. The proposed design comprises convoluted metallic patterns on both sides of a dielectric substrate (interdigital capacitors on top, and meander lines on bottom) in an orthogonal arrangement. The novel feature of the structure lies...
Article
Full-text available
Recent progress in angle-insensitive narrowband and broadband metamaterial absorbers is presented herein. Initially, a few narrowband structures are described along with their absorption mechanisms. A bandwidth-enhanced absorber, conceptually derived from the existing narrowband geometry, is also discussed. Finally, several broadband absorbers havi...
Article
In this paper, a multifunctional active frequency selective surface (AFSS) is presented based on the switching responses of active components. The proposed structure comprises periodic arrays of metallic patterns imprinted on both sides of an FR4 substrate on which PIN diodes are embedded with parallel feed networks. The novelty of the design lies...
Article
Full-text available
Excimer laser micromachining has been extensively studied to machine Indium Tin oxide which is uniformly deposited over PET to realize transparent broadband metamaterial absorbers. Various micromachining parameters such as fluence and spot overlap are considered and optimized to ablate the ITO film with controlled damage to the PET substrate for ob...
Article
In this paper, an optically transparent broadband microwave absorber has been developed. The proposed geometry is constructed of patterned resistive films of ITO on flexible substrates, such that the structure exhibits broadband absorptivity (above 90%) from 4 to 17.20 GHz (covering C, X, and Ku bands). The novelty of the design lies in leveraging...
Article
In this letter, a reconfigurable rasorber has been designed based on switching activity of frequency selective surface (FSS) and resistive FSS. The proposed design consists of two periodic layers separated from each other by an air spacer. The upper layer comprising lumped resistors assists wide absorption band (above 90% absorption) from 3.8 to 10...
Article
This paper presents a broadband metamaterial absorber based on three-dimensional (3-D) printing technology. The proposed design comprises periodic arrays of honeycomb core as the constituent dielectric, onto which resistive paint has been deposited to realize broadband absorption. The novel feature of this structure is its perforated substrate geom...
Article
Full-text available
In this paper, a microwave cavity resonator is presented for chemical sensing applications. The proposed resonator is comprised of a three dimensional (3D) split-ring resonator (SRR) residing in an external cavity and capacitively coupled by a pair of coaxial probes. 3D-printing technology with polylactic acid (PLA) filament is used to build the 3D...
Article
Full-text available
Metasurfaces, owing to their attractive features, provide a wide range of potential applications. Electromagnetic absorbers based on metasurfaces have significantly improved responses compared to the earlier absorbers made from composite materials. Active metasurfaces, in contrast to the passive designs, can exhibit multifunctional characteristics...
Article
This paper presents a multifunctional reconfigurable frequency-selective surface (FSS) based on liquid-metal-filled microchannels engraved in an elastomeric substrate. The proposed FSS comprises two layers of periodic meandered patterns encased within the opposite sides of a dielectric, where the layers are arranged in orthogonal polarization with...
Article
This paper describes a miniaturized reconfigurable frequency selective surface (FSS) that incorporates a liquid metal alloy injected inside an elastomer. The structure comprises a meandered pattern engraved on a flexible dielectric substrate, where the liquid metal (eutectic gallium indium, EGaIn) adopts the geometry of the microfluidic channels. T...
Article
Full-text available
In this paper, an ultra-thin compact hexa-band metamaterial absorber has been presented using single layer of dielectric. The proposed design is polarization independent in nature owing to its fourfold symmetry and exhibits high angular stability up to 60° angles of incidences for both TE and TM polarizations. The structure is ultrathin in nature w...
Conference Paper
In this paper, an optically transparent broadband microwave absorber is presented, which is polarization-insensitive as well as angularly stable. The proposed structure is made of indium tin oxide (ITO) based resistive sheets, which exhibits absorption bandwidth (above 90%) from 3.6 to 15 GHz, thereby covering C, X, and partial Ku bands. The absorp...
Article
A cross polarization conversion (CPC) structure using metasurface over wide bandwidth has been presented for practical applications in this article. The unit cell of the proposed metasurface is made of metallic patch of single circular split-ring imprinted on top surface of a metal-backed single-layer dielectric substrate. Full width at half maxima...
Article
In this letter, a polarization-insensitive broadband switchable absorber has been presented, which exhibits wide absorption bandwidth switching between two frequency bands (S-band in one biasing state, and C, X bands in other state). The structure utilizes the circuit analog absorber concept to achieve broadband absorption, whereas switchable mecha...
Article
In this paper, an optically transparent metamaterial with broadband absorption is presented theoretically and demonstrated experimentally. The design comprises of structures made of resistive films of indium-tin-oxide and the metamaterial exhibits over 10 dB absorption in the frequency range of 6.06–14.66 GHz. The novelty of the structure lies in i...
Article
In this paper, polarization-insensitive tunable absorbers are presented for single- and dual-band applications with wide tuning range. The proposed designs consist of periodic patterns of split square loops connected with cross-dipoles through varactor diodes which exhibit tunable performances. Due to four-fold symmetry, the structures have the nov...
Article
In this paper, a low-profile miniaturized-element frequency selective surface (FSS) is presented numerically as well as experimentally. The proposed design consists of a meandered pattern printed on both sides of an ultra-thin (0.0005λ0) FR-4 substrate, which exhibits a bandpass characteristic at 750 MHz having unit cell dimensions of 0.017λ0 × 0.0...
Article
A polarisation-independent tunable absorber has been presented with wide tuning range. The proposed design consists of periodic patterns of square loops connected through varactor diodes, thus resulting in tunable performance. Due to four-fold symmetric design, the structure exhibits tunable characteristic for all polarisation angles unlike the ear...
Article
In this paper, a low-profile broadband frequency selective surface (FSS) is presented for wideband shielding. The FSS consists of periodic patterns of circular loops connected among themselves through varactor diodes, which exhibit tunable operation. The novelty of the proposed design lies in its wideband tuning, where the bandstop response can be...
Article
A novel polarization rotator design is demonstrated theoretically as well as experimentally based on frequency selective surface (FSS). The polarization rotator selectively allows the linearly polarized incident wave to pass through the structure and rotates it by 90o in a given frequency band. The periodic element of the FSS design consists of ort...
Article
A novel miniaturized-element dual-band frequency selective surface (FSS) with closely spaced resonance is presented in this letter. The proposed FSS comprises of meander lines printed on a single-layer dielectric substrate to provide dual stopband characteristic. Compared to previously published spatial filters, the proposed FSS has better miniatur...
Article
A dual-band switchable absorber is presented with independent switching of absorption frequencies. The unit cell of the proposed structure is comprised of an annular ring and a cross-dipole where switchable p-i-n diodes are embedded. By controlling the bias voltage of the diodes, both the absorption frequencies can be switched between two frequency...
Article
In this paper, an ultra-thin dual-band conformal metamaterial absorber has been presented for X and Ku-band applications. The proposed metamaterial unit cell consists of cross-spanner like structure in center with square patch at corners on the top of a metal-backed substrate. The proposed absorber offers low profile with a thickness of λo/126 and...
Conference Paper
In this paper a broadband transmission polarization rotator based on multi layered metasurfaces has been presented. The proposed structure consists of three differently oriented split rings separated by FR4 dielectric substrates and air spacers between them. The simulation results show that the designed structure can rotate linearly polarized incid...
Conference Paper
This paper presents an ultra-thin dual-band polarization-insensitive metamaterial absorber for C-band applications. The proposed structure comprises of a square loop and a modified split ring resonator on the top surface of a metal grounded dielectric substrate. The designed absorber offers low profile with a thickness of λ 0 /56 and λ 0 /49at 5.4...
Conference Paper
In this paper, a low-profile tunable bandstop frequency selective surface (FSS) is presented for S-band applications. The FSS consists of square loops connected through varactor diodes across the diagonals. By controlling the reverse voltage of the varactors, the resonance frequency can be tuned for a wide frequency range. Full-wave simulation show...
Article
Full-text available
In this paper, a polarization-insensitive triple-band metamaterial absorber is proposed for wide angle of incidence. The proposed absorber has been designed in such a way that absorptions occur in S, C and X bands at 3.1, 4.6 and 9.5 GHz, respectively. The unit cell consists of two modified square-shaped closed-loop resonators printed on top of a d...
Article
In this article, a novel polarization-insensitive and angularly stable miniaturized frequency selective surface (FSS) has been presented. The proposed structure has a single bandpass operation centred at 1.42 GHz, which is printed on an ultra-thin (0.00127λ0) dielectric substrate. Compared with earlier reported structures, the designed FSS demonstr...
Conference Paper
In this paper, a broadband polarization-insensitive single layer circuit analog absorber has been presented. The proposed absorber consists of a periodic arrangement of square loops loaded with lumped resistors, which exhibits 10-dB bandwidth from 7.56 GHz to 14.58 GHz under normal incidence, covering X and Ku bands. The structure has been characte...
Article
A low-profile broadband capacitive circuit absorber has been demonstrated both numerically and experimentally. The design consists of square loop resonators and lumped resistors periodically arranged on the top of grounded dielectric substrate. The novelty of the design lies in its capacitive reactance due to square loop geometry, which reduces the...
Conference Paper
In this paper, an ultra-thin dual-band conformal metamaterial absorber has been presented for curved surface applications. The proposed structure consists of a periodic array of two concentric rings printed on a grounded dielectric substrate. The numerical simulation shows that two discrete reflection dips occur at 7.22 GHz (C-band) and 14.55 GHz (...
Conference Paper
In this paper, a single band switchable metamaterial absorber based on active frequency selective surface (AFSS) has been presented. The proposed design comprises of periodically arranged circular loops on which semiconductor switches (PIN diodes) are implemented. By controlling the bias voltage of the PIN diodes, the absorption frequency can be sw...
Article
In this communication, a switchable absorber/reflector based on active frequency-selective surface (AFSS) has been presented for single- as well as broadband applications. The FSS comprises periodic patterns of square loops connected among themselves through p-i-n diodes, which exhibit switchable performances. The novelty of the proposed design lie...
Article
In this paper, a switchable wideband reflective metamaterial polarisation rotator based on plasmon resonances has been presented. The proposed design comprises of periodically arranged split rings on which PIN diodes are mounted to demonstrate switching operation. By controlling the bias voltage of the PIN diodes, the polarization of the reflected...
Article
A broadband polarisation-independent circuit analogue absorber comprising multi-layer resistive frequency selective surfaces (FSS) has been presented in this study. The proposed structure consists of a periodic arrangement of square loops loaded with lumped resistors and these square loops are printed on dielectric substrates separated by an air sp...
Article
A polarisation-independent switchable absorber/reflector based on active frequency selective surface (AFSS) has been reported. The FSS design consists of diagonally connected circular loops on which semiconductor switches (PIN diodes) have been mounted. By controlling the bias voltage of the PIN diodes, the structure shows perfect reflection in ON...
Article
In this article, a broadband polarization insensitive metamaterial absorber has been proposed for C-band (4–8 GHz) applications using lumped resistors. The unit cell of the proposed structure is based on an inverted Minkowski fractal loop, where four lumped resistors are mounted to obtain a broad absorption band at the expense of 5 mm thick dielect...
Article
In this study, a novel multi-band metamaterial absorber has been proposed which is ultra-thin, compact, polarisation-insensitive and wide-angle absorptive. The proposed structure comprises two concentric metallic rings printed on a dielectric substrate which is backed by a metal ground plane. The proposed structure exhibits four distinct absorption...
Conference Paper
In this paper, a broadband circuit analog absorber has been presented based on lumped resistors, which exhibits 10 dB absorption bandwidth from 3.96 GHz to 8.16 GHz, covering entire C-band. The designed structure is polarization-insensitive and wide-angle absorptive. The effect of the lumped resistors has been studied to examine the absorption mech...
Conference Paper
The polarization state of electromagnetic (EM) wave can be manipulated using composite meta structures. In this paper a multi-layer metasurface has been proposed which rotates linearly polarized EM wave by 90° over the frequency range of 4.4-12 GHz. More than 90% cross-polarization conversion efficiency is observed, whereas co-polarized transmissio...