Zubair Akhter

Zubair Akhter
Indian Institute of Technology Kanpur | IIT Kanpur · Department of Electrical Engineering

PhD IIT Kanpur

About

38
Publications
2,510
Reads
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390
Citations
Additional affiliations
January 2017 - November 2017
Indian Institute of Technology Kanpur
Position
  • Research Associate
July 2014 - present
Indian Institute of Technology Kanpur
Position
  • Sr. Student Research Associate
January 2012 - present
Indian Institute of Technology Roorkee
Position
  • PhD Student

Publications

Publications (38)
Article
A novel time domain measurement technique is proposed to facilitate the simultaneous measurement of electrical properties (complex relative permittivity) and geometrical parameters (thickness) of the material under test (MUT). The overall process is noninvasive and noncontacting, which uses the measured scattering data of the MUT in the equivalent...
Article
In this paper, a novel time domain practical scheme is proposed to reconstruct the dielectric image of the inhomogeneous multi-layered media. The overall process is noninvasive and noncontacting, which employs the measured scattering data of the test media in equivalent time domain. The measurement system consists of a modern vector network analyze...
Article
The paper reports a dual-band transmitter that operates simultaneously at two wireless local area network (WLAN) frequencies of 2.4-GHz and 5.2-GHz. The transmitter's architecture employs a combination of direct-conversion and parallel schemes in order to achieve concurrent multi-band operation with reduced component count. This, in turn, leads to...
Article
In this letter, a tapered slot ultrawide band (UWB) Vivaldi antenna with enhanced gain having band notch characteristics in the WLAN/WiMAX band is presented. In this framework, a reference tapered slot Vivaldi antenna is first designed for UWB operation that is, 3.1–10.6 GHz using the standard procedure. The band-notch operation at 4.8 GHz is achie...
Conference Paper
In this paper, a new technique is proposed for obtaining two-dimensional microwave image of the illuminated medium in order to detect concealed objects. The required image is obtained by scanning the medium under test (MUT) in the two-dimensional plane under the assumption that the MUT is illuminated with a plane wave and the scattering parameters...
Article
An automated microwave technique for the monitoring of hidden objects for strategic applications has been presented. The proposed approach is quite novel as it implements and integrates the time-domain method in free-space with the indigenously developed automated scanning setup to obtain the dielectric profile of hidden objects in standard sand or...
Article
In this paper, a novel microwave imaging methodology based on the simplified experimental setup for identifying hidden crevasse in a glacier or polar terrain is proposed. For scanning the glacier terrain, a new eight-slot Vivaldi antenna (ESVA) with high directivity (16 dBi) and wide bandwidth is proposed. The proposed antenna is designed for the w...
Article
In this paper, the generalized substrate integrated waveguide (SIW) cavity technique is presented for the retrieval of broadband complex permittivity of medium loss dielectrics using a number of higher order modes of the proposed cavity. The proposed SIW cavity design improves the coupling by implementing a novel feeding topology to achieve a bette...
Article
Wireless RF sensors are the building blocks of the next generation sensing techniques that are quite essential for the internet of things. In this paper, the RF system comprising of ultra-wideband transmitter-receiver antenna and highly sensitive planar sensor is proposed for wireless sensing of glucose and saline concentration, which are currently...
Article
Abstract: In this paper, an attractive time-domain RF imaging technique is proposed for online monitoring of moving objects over conveyor belts. The proposed technique combines the strength of the time-domain approach and the Riccati equation-based ultrawideband reconstruction method in order to image the stratified lossy dielectric medium. The app...
Article
In this paper, a highly efficient, low-cost scheme for two-dimensional microwave imaging is proposed. To this end, the AZIM (anisotropic zero index metamaterial) cells loaded Vivaldi antenna is designed and tested as effective EM radiation beam source required in the microwave imaging scheme. The designed antenna is first individually tested in the...
Article
The hemisphere lens-loaded Vivaldi antenna for the microwave imaging applications is designed and tested in this paper. The proposed antenna is designed to work in the wide frequency band of 1–14 GHz, and is fabricated on the FR-4 substrate. The directivity of the proposed Vivaldi antenna is enhanced using a hemispherical shape dielectric lens, whi...
Article
Full-text available
The conventional tapered slot Vivaldi antenna is well known for its ultra-wide band characteristics with low directivity. To improve the directivity of the conventional Vivaldi antenna, a four-slot Vivaldi antenna (FSVA) is proposed here to operate in the frequency range of 2–11 GHz. For feeding the FSVA, a binomial three-section V-shaped even mode...
Conference Paper
In this paper, a novel time domain RF imaging technique is presented for online monitoring of moving objects over conveyor belts. The proposed technique provides the knowledge of electrical properties i.e., relative permittivity and thickness of material under test (MUT), in addition to the structural properties i.e., size and shape of the interrog...
Conference Paper
A terahertz reflectometry technique is proposed to assess the burn injuries of human skin. In order to differentiate burn injuries of various degrees, a simple stratified media models for the healthy and various degrees of burned skin are presented. The variation of water content is the key measure used in this study to differentiate the burned and...
Conference Paper
A generalized ultra wideband approach for subsurface microwave imaging and nondestructive testing of the stratified media is presented. The proposed approach makes use of the scattering data measured in both frequency and time domains to reconstruct the inhomogeneous permittivity profile of the stratified media. This approach integrates the frequen...
Article
A novel calibration independent technique that simultaneously determines the optical constants and material thickness with high accuracy, using the transmission and the reflection measurements, is proposed. A generalized closed form expression is derived to calculate the optical constants in terms of the measured transmitted and the reflected signa...
Conference Paper
Full-text available
In this paper, a modified cylindrical Luneberg lens antenna is proposed for the microwave/millimeter wave imaging applications. The proposed Luneberg lens is designed using the Teflon substrate (ε r = 2.1) by making cylindrical voids of different radius along the circumference. The parameters of the designed antenna such as the directivity and the...
Conference Paper
In this paper, a compact design of the ultra-wideband (UWB) highly directive double slot Vivaldi antenna (DSVA) is presented for microwave application in the frequency range of 2–10 GHz. In order to improve the directivity of the proposed DSVA, the zero index metamaterial (ZIM) unit cells are loaded on the E-plane of the antenna. It is found that t...
Article
A quasi-numerical optimization technique is presented to obtain the depth-dependent microwave dielectric image of the lossy inhomogeneous media. The proposed optimization scheme involves inverse solution of the corresponding microwave imaging problem in an efficient way. The initial condition for the optimization routine is obtained using an analyt...
Conference Paper
In this paper, the design of a novel left-handed metamaterial (LHM) lens for the super resolution mm-wave imaging applications is presented. The designed LHM lens exhibits negative unity refractive index for two adjacent bands centered at 33.5 GHz and 35 GHz, respectively. It is observed that the proposed LHM lens bends the EM wave in a way, which...
Article
In this paper, a compact design of conventional tapered slot antenna (TSA) loaded with the anisotropic zero-index metamaterial (ZIM) for the frequency range of 1 to 10 GHz is presented. The proposed TSA loaded with the ZIM exhibits an increase in the directivity up to 2.6 dB. The designed antenna is fabricated on the FR-4 substrate and tested. A go...
Conference Paper
In this paper, the moisture content for cement based structures having different water to cement (w/c) ratio is carried out using the microwave free space technique. The measurement system consists of a vector network analyzer, a wide-band lens horn antenna and associated microwave components. The main focus here is to determine the loss factor or...
Conference Paper
In this paper, the moisture content for cement based materials having different water to cement (w/c) ratios is measured using the microwave free space technique. The overall process is non-destructive and employs the time-domain measurement data. The measurement system consists of a vector network analyzer, a wide-band lens horn antenna, cement ba...
Conference Paper
In this paper, the microwave based approach for the nondestructive testing of cement based materials and concrete structures is presented. The permittivity of a number of concrete samples having various material compositions has been determined using the proposed approach, which actually helps in distinguishing these samples. It is also observed th...
Conference Paper
The paper reports design of a concurrent dual band transmitter for simultaneous operation at 2.4/5.2GHz. A combination of direct conversion and parallel architectures is utilized to satisfy the requirements of various signal modulation schemes that are employed in wireless local area network. The entire transmitter architecture is implemented using...

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Projects

Project (1)
Archived project
Permittivity extraction of unknown dielectric and liquid solvents using different imaging techniques and antennas designed for the application. One-dimesnional and two-dimensional imagng to reconstruct the reflectivity images.