Anveshkumar Nella

• Doctor of Philosophy
• Professor (Assistant) at VIT Bhopal University

Terahertz (THz) imaging is a non-invasive and high spatial-resolution technique that uses non-ionizing electromagnetic signals in a frequency range of 0.1–10 THz. Hence, this article focuses on diverse THz imaging techniques, THz antennas and designing methods, image reconstruction algorithms, and its applications. The antennas include planar patch...

In this present contemporary epoch, wireless communication appliances exemplified meteoric progression in technology. These systems entail an antenna in every strand of communication. Depending upon the recent expansions in generations, the antennas become more compact, lightweight, portable, wearable, cost-effective, and conformal while maintainin...

This communication reports a conformal offset feed Quasi-Yagi antenna at 300 GHz for high-directional applications. A novel offset feed mechanism is adopted to obtain directional behavior from a conventional planar structure. The proposed antenna is designed on a Silicon-dioxide (SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="...

This article proposes a fourfold star petal–shaped nanostructure, as a broadband plasmonic metamaterial absorber applicable in the frequency band of 390 THz to 750 THz. In this range, it provides a median absorbance of over 96% regardless of all polarization angles. The proposed absorber also exhibits stable performance in both TE and TM modes. A s...

This work presents a non-invasive method to determine the glucose levels in blood samples using a planar Yagi-Uda antenna and a novel microstrip filter. The proposed antenna operates at 5.5 GHz and exhibiting uni-directional pattern giving a maximum gain of 6.74 dBi at the operating band. A commercially available and low-cost FR-4 substrate of dime...

This article is intended to propose a novel gold and SiO2 material based planar 5-element high half power beam-width (HPBW) end-fire antenna array for 300 GHz applications. The proposed radiating structure composes of a 5-element off-set feed rectangular patch antenna array fed by a tapered microstrip line to accomplish high HPBW. Off-set feeding a...

This study presents the design and analysis of a high-performance metamaterial absorber for the optical terahertz (THz) regime. The proposed absorber utilizes a unique nested flower-shaped structure composed of nickel (Ni) and silicon dioxide (SiO2), achieving an average absorption exceeding 97.91% with a broad bandwidth of 1320 THz (180 THz − 1500...

This paper presents a five‐element antennas system formed by integrating one sensing and four reconfigurable communicating antennas on a single substrate for cognitive radio applications in the 2.4 and 5 GHz WLAN bands. The five antennas are termed as A‐1, A‐2, A‐3, A‐4, and A‐5, where A‐1 is designed to sense in the 2.4 (2.4–2.484 GHz) and 5 GHz (...

This article presents dual-band low-power, high-sensitive radio-frequency (RF)-to-direct current (DC) signal converter circuits, operating at 2.45 and 5.5 GHz bands, for radio frequency energy harvesting applications. In particular, it focuses on the lumped element and microstrip transmission line model circuits. The lumped element RF-to-DC convert...

A four‐element hexa‐band inverted U‐shaped merged stubs miniaturized Multiple‐Input Multiple‐Output (MIMO) radiator, operating in 2.10–2.17 GHz for 3G (2.17 GHz) band, 2.52–2.60 GHz for 4G (2.5 GHz) band, 3.31–3.46 GHz for 5G (3.4 GHz [n77 and n78]) bands, 3.66–3.72 GHz for 5G (3.7 GHz [n77 and n78]) bands, 4.53–4.62 GHz for 5G (4.5 GHz [n79]) band...

We have invented a new design of a Flexible Plasmonic Metamaterial Absorber for Optical Radiation Energy Harvesting as set forth in the following specification. Three-layer structure, comprising a 7 nm thick Nickel (Ni) metallic ground plane, a 12 nm Glass insulating separator surface, and a 5 nm thick upper metallic layer of Ni. At the heart of th...

This work deals with the design and development of a conformal series-fed antenna structure operating at the 60 GHz frequency. The proposed antenna operates from 57 GHz to 62 GHz with good return loss and radiation characteristics for 6G and beyond applications. The antenna is shown to give a good gain of more than 14.7 dBi with directional radiati...

Call for Book Chapters

Energy harvesting/scavenging is a technique in which ambient energy is extracted from the surroundings and converting it to another form, which can be later used for diverse applications. This chapter focuses on the techniques to acquire various forms of energy and converting them into electrical energy to be utilized for portable electronic device...

This book focuses on the numerous energy harvesting techniques and their system implementation towards the fulfilment of energy requirements in compact electronic devices. These cover a wide range of applications in portable devices, bio-medical services, agriculture needs, mechanical systems, sensor networks, automobiles, food sector, home applian...

In the present work, a novel compact and highly sensitive microwave antenna sensor at 2.45 GHz is proposed for evaluating glucose concentration in blood. The antenna is printed on an FR-4 substrate of compact dimensions 35 mm × 13.5 mm × 1.6 mm. A human finger phantom model is constructed in the EM simulation high frequency structure simulator envi...

This article proposes a flexible optical radiation absorber based on a modified Huguenot cross-shaped nanostructure. The suggested plasmonic metamaterial flexible absorber (PMFA) structure consists of three layers noted as a metallic ground plane, an insulating separator surface, and a metallic upper layer. A ground plane of thickness 7 nm is made...

This paper presents design of a 4-element crescent-shaped two-sided multiple-input-multiple-output (MIMO) antenna, employing pattern and polarization diversity with improved element-to-element isolation, for UWB, X and Ku band wireless applications. The proposed crescent-shaped MIMO structure consists of two antennas on the top and remaining two an...

This paper presents design of a 4-element crescent-shaped two-sided multiple-input-multiple-output (MIMO) antenna, employing pattern and polarization diversity with improved element-to-element isolation, for UWB, X and Ku band wireless applications. The proposed crescent-shaped MIMO structure consists of two antennas on the top and remaining two an...

This work presents a unique non-invasive method for monitoring glucose levels in blood using a planar Yagi–Uda antenna as a microwave sensor. The proposed antenna, operating at 5.5 GHz, exhibits a directional radiation pattern with a peak gain of 6.74 dBi. A low-cost FR4 material of size 30 mm × 40 mm × 1.6 mm is used as a dielectric substrate. A h...

In this article, a cognitive radio (CR) integrated antenna system, which has 1 sensing and 24 communication antennas, is proposed for better spectrum utilization efficiency. In the 24 communication antennas, 3 different operating band antennas are realized with an 8-element MIMO configuration. The sensing antenna linked to port 1 is able to sense t...

This work presents a 12-element 360° azimuth plane scanning planar circular antenna array for compact THz wireless devices. Proposed array comprises of 12 bow-tie Yagi-Uda directional antennas, operating within 0.235–0.322 THz band where each antenna achieves a maximum radiation beam for an angle of around 30°, arranged in a circular fashion to cov...

This paper proposes a miniaturized UWB resonating THz unit-cell absorber in the visible light spectrum 400 - 700 THz with an average absorption of more than 95%. This novel structure is tuned to desired photonic spectrum by plasmonic electric and magnetic resonance with the suitable choice of the metal-insulator-metal stacked layers. The arrangemen...

The paper reports an experimental investigation of an 8 × 8 MIMO antenna fabricated on a commercially available FR4 substrate. A fractal printed monopole radiator is introduced as a good prospect for super‐wideband (2.85–20.0 GHz) multiple‐input‐multiple‐output (SWB‐MIMO) configuration. The MIMO antenna is printed on both the planes (Plane A and Pl...

This work presents a design of 10-element symmetric series fed non-uniform planar antenna array operating at 0.3 THz and exhibiting high directional radiation pattern along the upper hemisphere. An impedance bandwidth of range 0.294–0.313 THz and a peak gain (dBi) of 13.26 at 0.3 THz are noted. Gold material of thickness 5 µm and silicon dioxide (S...

CALL FOR BOOK CHAPTERS BOOK TITLE---“Terahertz Devices, Circuits and Systems - Materials, Methods and Applications” Dear Author!!! Hope you are fine and doing great. Please do take care of yourself during the pandemic situation. We are delighted to invite your unpublished work for the book entitled “Terahertz Devices, Circuits and Systems - Materi...

This paper reports a 4 × 4 and 8 × 8 MIMO antenna configuration on FR4 substrate occupying the area of 1.43λo × 1.43λo mm² (f = 3.58 GHz) and 2.14λo × 2.14λo mm² (f = 3.50 GHz). The proposed design is exclusively developed for 5G: n77/n78 wireless band applications. The MIMO antenna comprises of Lotus-shaped radiating element with DGS (defected-gro...

A four‐element multiple‐input‐multiple‐output (MIMO) antenna with modified substrate geometry is proposed. The antenna comprises a hollow semi‐hexagonal‐shaped conductive element on the top with the modified ground plane geometry. Polarization diversity and isolation are achieved by replicating the elements orthogonally. The L‐shaped part is remove...

In this paper, a compact micro-sized rhombus-shaped wideband THz antenna is proposed. The radiating patch has been modified by incorporating a rhombus-shaped gold metal-based element within the inscribed square-shaped slot on the surface of the patch. The proposed monopole antenna is designed on a 45-μm-thick polyimide substrate material having a d...

A frequency reconfigurable 4-port integrated ultra-wideband and narrowband antenna structure for cognitive radio application is reported in this article. The proposed structure comprises four distinct antennas integrated on FR-4 sub-strate of dimensions 42 Â 42 Â 1.6 mm. The first antenna, named as ANT-1, is a CPW fed UWB antenna exhibiting À10 dB...

This book highlights the growing applications of THz technology and various modules used for their successful realization. The enormous advantages of THz devices like higher resolution, spatial directivity, high-speed communication, greater bandwidth, non-ionizing signal nature and compactness make them useful in various applications like communica...

Design of an integrated ultra wide-band and narrow-band three-antenna structure for cognitive radio communication in 5G, WLAN, LTE and ITU bands is reported. This structure constitutes of an ultra wide-band antenna to monitor the radio spectrum and two narrow-band antennas performing communication. The UWB and narrow-band antennas are stamped on an...

Multiple-input multiple-output (MIMO) antennas with four and eight elements having connected grounds are designed for ultra-wideband applications. Careful optimization of the lines connecting the grounds leads to reduced mutual coupling amongst the radiating patches. The proposed antenna has a modified substrate geometry and comprises a circular ar...

Language identification (LID) is identifying a language in a given spoken utterance. Language segmentation is equally important as language identification where language boundaries can be spotted in a multi-language utterance. Language identification could be a trivial front-end process for real-time mixed-speech recognition applications. India is...

This article is aimed to discuss a novel high directional flared quasi‐Yagi offset feed monopole UWB antenna. The proposed antenna is stamped on an FR‐4 dielectric material of dimensions 40 mm × 48 mm × 1.6 mm, which is exhibiting a permittivity of 4.4 and a loss tangent of 0.019. It operates within a frequency spectrum of 3.06 to 12.37 GHz that in...

This paper discusses the design of a circular planar monopole UWB antenna for spectrum sensing in the band 3.1-10.6GHz, which is FCC proposed unlicensed UWB range. It is a key module for implementing CR in 3.1-10.6GHz. The design is customized on the substrate (FR4) with size of 29×21×1.6mm 3. It achieves S11 ≤-10dB in 2.27GHz-12.8GHz. It shows 97%...

This paper reports the design of a planar circular monopole Ultra-wideband (UWB) antenna for RF energy harvesting. It achieves S11 ≤-10dB in 1.76GHz-12.23GHz, which coexists with RF bands like GSM1800 (DL: 1.805-1.88GHz), UMTS, LTE, Wi-Fi, ISM, UWB, WLAN, Wi-MAX and X-band. This antenna helps to capture the unused RF energy in these bands for harve...

The purpose of this research paper is to propose a planar compact Yagi-Uda antenna for WLAN 2.4GHz band applications. This paper also discusses techniques to enhance the gain and directivity of the antenna by introducing an inverted mirror J structure on the ground plane and directors on the top plane. The proposed antenna is designed and fabricate...

This article mainly focuses on the concept of cognitive radio paradigm in the ultra-wideband 3.1–10.6 GHz and recent trends of various antenna systems required for these applications. This paper also presents the working principle of cognitive radio model and the importance of UWB 3.1–10.6 GHz technology for various wireless communication applicati...

Purpose Non-orthogonal multiple access (NOMA) is a much hopeful scheme, which is deployed to enhance the spectral efficiency (SE) significantly, and it also enhances the massive access that has attained substantial concern from industrial and academic domains. However, the deployment of superposition coding (SC) at the receiver side resulted in int...

As the demand of power is raising day to day, the dependency on alternate energy sources is also increasing. Abundant RF energy is available in the nature 24×7 in the form of radiation from various RF sources. Designing a miniaturized wideband or multiband antenna with good performance to capture this RF energy is need of the hour. This paper prese...

The paper emphasizes on Ultra Wide Band (UWB) technology, which gained popularity since nineteenth century. This technology is still proliferating to new branches of research due to its key features like secure, reliable, low power consumption and high speed data transfer over smaller distances. The paper presents a hexagon slotted circular monopol...

Ultra Wide Band (UWB) is a buzzing word in recent times. This technology attracted researchers due to its features like less power consumption, low cost, high speed data transfer, multipath immunity, reliability, security, simultaneous ranging and communications. This paper discusses a planar UWB design which is printed on FR4 substrate of dimensio...

The Ultra Wide Band (UWB) technology contribute significantly to recent wireless communications due to its merits like very large bandwidth, multipath immunity, high security, reliability, low cost, low power and high speed data transfer. To make use of this technology for contemporary applications it is a challenging task to design small sized pri...

The purpose of this paper is to design an antenna that operates at a lower frequency of 500MHz and has a small size suitable for space exploration rovers equipped with Ground Penetrating Radar. This antenna can be used for subsurface investigations of celestial bodies like Moon and Mars. The primary difficulty that lies within designing an antenna...

This paper is intended to discuss hardware setup implementation for realizing the spectrum sensing and communication functionalities of a five‐port integrated ultrawideband and narrowband antenna system. The five‐port integrated antenna system consists of one ultrawideband antenna and four narrowband antennas. The ultrawideband antenna is used for...

This paper is intended to discuss a typical approach of modeling lumped equivalents for narrowband antennas. In this approach, the equivalent circuits are approximated using the typical presumption of distributed elements in the fashion of resistor (R), inductor (L), capacitor (C) and conductance (G). This paper initially introduces lumped approxim...

This paper is devoted to present various compact and novel multi-port planar merged ultra-wide band and narrow band antenna systems for cognitive radio process in the ultra-wide band 3.1-10.6GHz. In these systems, each system consists of one ultra-wide band antenna for frequency holes monitoring and many narrow band antennas for signal transmission...

he purpose of this research paper is to propose a compact circular planar monopole UWB antenna. This paper also discusses techniques to enhance the higher cut-off frequency of the UWB antenna. It is carried out by introducing different slots on the partial ground plane. The proposed antenna was designed and fabricated on a FR-4 substrate of dimensi...

Cognitive radio technology is a new paradigm in which the radio environment is continuously monitored for available channels, which are also termed as spectrum holes. If any spectrum hole is identified then that channel can be used for any wireless communication service. This key technology enhances spectrum utilization efficiency when the spectrum...

Today's wireless spectrums are characterized by a fixed spectrum assignment policy. However, a huge portion of the allocated spectrum is used spasmodically and geographical variations in the usage of allocated spectrum ranges from 15% to 85% with a high discrepancy in time. We can't create resources but we can reuse the available resources. Cogniti...

Radio Frequency Energy Harvesting (RFEH) and Wireless Power Transfer (WPT) techniques have recently attracting huge attention and hold a promising future to generate power to the next-generation wireless networks. As these emerging technologies enable proactive energy replenishment of wireless devices and offers various environmentally friendly alt...

This paper is aimed to present a planar four-port integrated UWB and narrowband (NB) antenna system for cognitive radio (CR) technology in the UWB 3.1GHz to 10.6GHz. This system consists of a UWB antenna for spectrum monitoring and three NB antennas for communication. These ultra wideband and narrowband antennas are incorporated on an FR-4 substrat...

In [1] , it was stated that the third NB antenna, linked at P4, is achieving maximum gains of −2.83 and 0.65 dBi at 3.7 and 7.6 GHz, respectively. The fourth NB antenna, allied at P5, is achieving a maximum gain of −0.88 dBi at 5.6 GHz.

This paper initially discusses lumped equivalent models of narrow band (NB) antennas and then presents a technique to enhance isolation between UWB and NB antennas of the three antennas system. The proposed models are able to yield similar S-parameter performance as that of NB antennas at their resonant frequencies. Also, a good match is observed a...

The main motive of this paper is to discuss a design of compact five-port integrated ultra wideband (UWB) and narrowband (NB) antennas system for cognitive radio (CR) applications. The proposed system composes of one UWB antenna for spectrum sensing and four NB antennas for communication. The UWB and NB antennas are printed on a very compact FR-4 s...

In recent years, the demand for spectrum continues to increase with the advent of various wireless communication applications. However, it is a limited resource and cannot be made available beyond a certain extent. Many of the times, licensed spectrum is free due to its inefficient utilization. So, it can be utilized for other applications to mitig...

In modern wireless communication, microstrip antennas are widely equipped in mobiles, laptops and other portable devices due to their advantages like small size, light weight, low cost and easy integration with planar structures. Moreover, the research evolution in these antennas, which are required for portable wireless communication system applic...

Design and analysis of a moon slotted circular planar monopole UWB (ultra-wide band) antenna is discussed. The proposed antenna operates within a frequency spectrum of 2.62GHz to 12.63GHz, which includes the unlicensed band 3.1GHz-10.6GHz approved by FCC in 2002. It achieves a maximal peak gain of 4.85dBi at 9.75GHz and highest radiation efficiency...

The main motive of this paper is to discuss design and performance analysis of a modified circular planar monopole UWB antenna. The proposed antenna, printed on a FR-4 substrate of dimensions 30mm×20mm×1.6mm, is designed to operate within the 2.66GHz to 11GHz band that includes the FCC unlicensed spectrum of 3.1GHz to 10.6GHz. It attains a highest...

In modern wireless communication, UWB applications are becoming very popular because of reliable, secure and high speed data transmission over smaller distances. In these applications, it is very much essential to have small size printed antennas for transmitting and receiving of UWB signals. However, designing small size printed antennas with good...

The design of a three-port radiating structure, integrating wide and narrow band antennas for cognitive radio applications, is presented. It consists of a UWB antenna for spectrum sensing and two narrow band antennas for wireless communication integrated on the same substrate. The UWB antenna covers the complete UWB spectrum (3.1 GHz to 10.6 GHz) a...

There are various patch antennas used for Wi-Fi and Wi-MAX applications. But, the problems with them are low gain, low power handling capacity and hence, conventional yagi-uda antennas are used. Conventional yagi-uda antennas are used in applications where high gain and directionality are required. Generally, numbers of directors are added to incre...

Basically, UWB (3.1GHz to 10.6GHz) applications require small size printed antennas for transmitting and receiving of UWB signals. However, designing small size printed antennas with good performance is quite a challenging task. In this paper, we introduce a simple and small size planar monopole antenna for UWB applications. Proposed UWB antenna is...

The main objective of this paper is to discuss a design of planar monopole printed antenna for WiMAX applications. Proposed antenna consists of a circular radiating patch on the top surface of the FR-4 substrate with isosceles triangular slot in the middle. This design is having a multi-structural defected ground plane for better performance. Propo...

In recent years, micro strip antennas are playing an important role in wireless communication systems because of their many advantages like light weight, low profile, low cost, easy integration with planar structure and easy fabrication. So, it is very much essential to know all the aspects of micro strip antennas. The main objective of this paper...

Ground Penetrating Radars are mostly used in fields like earth sciences and military applications. In earth science it is for studying Soils, Water content, ice. In military applications it is for locating mines, tunnels and unexploded ordnance, in a single word we can say that GPR acts as a sensor. The main objective of this project is to design G...