Article
Engineering, Electrical & Electronic
Bal S. Virdee, Tohid Aribi, Tohid Sedghi
Summary: This article presents a wideband circularly polarised antenna array using a miniaturised double box branch-line coupler, achieving a slow wave structure and enhanced impedance bandwidth. The 2 x 2 antenna array, made of CP slot radiating elements, is excited through a feeding network. The proposed antenna array exhibits CP covering the bands of WiMAX, C-band, and ITU-R F386.9, with a wide impedance bandwidth and 3 dB AR bandwidth.
IET MICROWAVES ANTENNAS & PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Liang Zhang, Jia Chen, Wenning Wang, Zihang Qi, Tongyu Ding
Summary: This paper presents a two-layered wideband single-fed circularly polarised (CP) antenna, achieving a 17.9% impedance bandwidth from 2.13 to 2.55 GHz and a 13.1% 3-dB AR bandwidth from 2.15 to 2.45 GHz, validating its applicability for Wireless Local Area Network use.
IET MICROWAVES ANTENNAS & PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Matthieu Bertrand, Mauro Ettorre, Guido Valerio, Matteo Albani, M. Casaletti
Summary: This article introduces a circularly polarized corporate-fed radial-line slot antenna operating in the Ka-band, which is realized using low-cost, low-profile printed circuit board (PCB) technology. The antenna is fed by a corporate feed network based on a broadband pillbox-like circular transition, resulting in a 67% gain bandwidth improvement compared to traditional center-fed radial line slot antenna designs. The improvement in bandwidth is analytically derived and confirmed by measurements. The prototype is optimized, fabricated and characterized, with good agreement between simulated and measured gain bandwidths.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Yifan Liu, Xianling Liang, Xiaohan Zhang, Jianping Li, Junping Geng, Ronghong Jin, Lina Zhang
Summary: A new broadband circularly polarized antenna for K-band application is presented in the letter. The antenna achieves good performance with experiments showing good agreement with simulations, making it suitable for tough environment applications.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Computer Science, Information Systems
Yawen Wang, Anxue Zhang
Summary: This paper introduces a dual circularly polarized Fabry-Perot resonator antenna with a linear to circular polarization conversion metasurface as the superstrate. The metasurface's unit cell can independently control transmission and reflection characteristics, allowing for conversion of different LP waves into different CP waves.
Article
Computer Science, Information Systems
Wen-Wen Liu, Zhen-Hua Cao, Zhi Wang
Summary: This article introduces a 2 x 4 sequentially rotated wideband circularly polarized dielectric resonator antenna subarray with high gain. The antenna utilizes dual-cylindrical ceramic blocks and a sequentially rotated feeding network to achieve wide bandwidth capabilities.
Article
Engineering, Electrical & Electronic
Sirous Bahrami, Gholamhosein Moloudian, Ho-Jin Song, John L. Buckley
Summary: This paper proposes a tunable circularly polarized antenna with a reconfigurable integrated feed network for cognitive radio applications. The feed network consists of an ultrawideband bandpass filter, a tunable T-shaped resonator, and an L-shaped microstrip line. The antenna achieves wideband and narrowband operation modes, providing flexibility for different applications in cognitive radio systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Jose Herranz-Herruzo, Miguel Ferrando-Rocher, Alejandro Valero-Nogueira, Bernardo Bernardo-Clemente
Summary: Waveguide slot arrays are widely used for linearly polarized high-gain antennas. In this article, a new all-metal T-shaped radiating element is introduced to achieve circularly polarized arrays while preserving good performance. The inclusion of a parasitic arm perpendicular to the main active slot enables polarization conversion, allowing the T-shaped element to be used in arrays originally formed by metallic rectangular slots. Experimental results at 30 GHz demonstrate high design accuracy and manufacturing reliability.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Kexin Liu, Dong Yu, Hanyang Wang
Summary: The mechanism for the radiation efficiency local minimum in antennas, in particular open-slot antennas and T-shaped antennas, has been investigated. The local minimum in these antennas always corresponds to an ideal differential mode, and the frequency position of this mode is determined by the parasitic parts of the antennas. Simple methods for estimating the local minimum position have been proposed based on this mechanism, as well as a discussion on the duality relation between the two types of antennas. These findings offer guidance for designing mobile phone antennas with improved efficiency.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Ashish Kumar, Ajay Kumar Dwivedi, K. N. Nagesh, Anand Sharma, Pinku Ranjan
Summary: In this paper, a circularly polarised dielectric resonator-based MIMO filtering antenna is designed and analyzed. The proposed antenna combines circular polarisation characteristics with filtering response at mm-wave. Experimental results confirm the operating band of the antenna from 25.5 GHz to 27.79 GHz, with a peak gain of 5.0 dBi and satisfactory diversity parameters.
IETE TECHNICAL REVIEW
(2022)
Review
Chemistry, Analytical
Rajasekhar Nalanagula, Naresh K. Darimireddy, Runa Kumari, Chan-Wang Park, R. Ramana Reddy
Summary: Recent trends in dielectric resonator antenna research include the use of compound and hybrid structures, which have shown interesting and significant features in terms of bandwidth, gain, and circular polarization generation. This critical review discusses the evolution of circularly polarized hybrid dielectric resonator antennas, with a general discussion on circular polarization and DR antennas, along with indications of future challenges and new design ideas. Additionally, state-of-the-art advances and associated design challenges of circularly polarized hybrid DR antennas are discussed, including empirical formulas to find resonance frequency of different hybrid modes.
Article
Computer Science, Information Systems
Jia-Cheng Liang, Cheng-Nan Chiu, Tsung-Ching Lin, Chih-Hung Lee
Summary: This paper presents a novel ultrawideband antenna that exhibits high gain and circular polarization. The antenna consists of four sophisticated antipodal Vivaldi antennas and an ultrawideband feeding network. The antenna achieves circular polarization that can be easily switched between right-handed and left-handed. The experimental results demonstrate that the antenna has a wide impedance-matching bandwidth and stable gain, making it suitable for applications in the Ku, K, and Ka frequency bands.
Article
Computer Science, Information Systems
Cho Hilary Scott Nkimbeng, Heesu Wang, Ikmo Park
Summary: This paper presents the design of a wideband circularly polarized bowtie slot antenna that utilizes metasurfaces to convert linearly polarized waves into circularly polarized waves. The antenna exhibits good performance with impedance bandwidth, axial ratio bandwidth, gain bandwidth, peak gain, and radiation efficiency measurements.
Article
Engineering, Electrical & Electronic
Hesham M. Elkady, Haythem H. Abdullah, Saad M. Darwish
Summary: A novel design of a high-frequency multiband circular polarisation antenna for CubeSat applications is presented. The antenna consists of a spiral antenna and four patch antennas, allowing it to cover multiple frequency bands. The measured results show good agreement with the simulated results.
IET MICROWAVES ANTENNAS & PROPAGATION
(2023)
Article
Computer Science, Interdisciplinary Applications
Wei He, Yejun He, Sai-Wai Wong, Chao-Hsiang Liao
Summary: This article introduces a simple wideband circularly polarized S-shaped slot antenna for ISM band wireless communication applications. The proposed antenna has a broad impedance bandwidth and simple structure, making it suitable for various RFID applications.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2021)
Article
Chemistry, Physical
Gaurav Varshney
Summary: The study demonstrates the implementation of an annular dielectric resonator antenna loaded with a graphene disk for THz applications, providing high gain and radiation efficiency.
Article
Water Resources
Nishtha Agrawal, Vivek K. Pandey, Shailendra K. Mishra, Vinay S. Pandey
Summary: This study evaluates temperature extremes in the troposphere over India during different seasons, finding significant trends in the lower troposphere but not the upper troposphere. The identification of these changes can be useful for analyzing coastal vulnerability and extreme weather conditions.
JOURNAL OF WATER AND CLIMATE CHANGE
(2021)
Article
Engineering, Electrical & Electronic
Rajveer S. Yaduvanshi, Nishtha
Summary: A novel conical terahertz dielectric resonator antenna has been designed and analyzed for both high data speed communication and optical sensor applications at 10 THz frequency range. The research opens up new possibilities for terahertz regime and demonstrates the unique dual band characteristics of the antenna through comprehensive analysis and mathematical formulations.
Article
Engineering, Electrical & Electronic
Rajveer S. Yaduvanshi, Rama Krishna Yadav, Saurabh Katiyar, Suresh Kumar, Harish Parthasarathy
Summary: This article presents a mathematical formulation and simulation of a Terahertz spherical dielectric resonator antenna (DRA) for LiDAR and retinal photoreceptor applications, demonstrating good performance. It introduces a novel mathematical approach for super directivity and radiated states.
Article
Optics
Gaurav Varshney, Neha Rani, V. S. Pandey, R. S. Yaduvanshi, Dharmendra Singh
Summary: A wideband terahertz metal-free absorber is proposed, using stacked graphite and graphene disks to achieve broadband absorption with a simple and compact geometry and polarization insensitivity. The tuning of absorber response is enabled by utilizing graphene disks to adjust the chemical potential.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Physics, Condensed Matter
Shailza Gotra, V. S. Pandey, R. S. Yaduvanshi
Summary: The study implemented a circular polarization generation technique in a rectangular dielectric resonator antenna using graphene material, with partial coating on the faces of the DR. This coating acts as an electric wall arranged orthogonally on the faces of the DR, generating orthogonal degenerate modes inside the DR for circular polarization generation.
SUPERLATTICES AND MICROSTRUCTURES
(2021)
Article
Astronomy & Astrophysics
V. S. Pandey, Ankit Kumar, M. K. Nayak
Summary: In this paper, the authors characterize the transverse oscillations in an incompressible non-ideal magnetohydrodynamic (MHD) fluid as either Alfvenic or Landau-type. They consider shear viscosity and magnetic diffusivity as dissipation mechanisms and derive a general dispersion relation for the incompressible MHD waves. The study finds that when magnetic tension dominates, the oscillations are of Alfvenic type, while when internal frictional forces dominate, the oscillations are of Landau type. The prediction of Landau-type transverse oscillations may help explain the heating of observed filamentary structures in the solar coronal plasma.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Engineering, Electrical & Electronic
Taruna Sharma, Gaurav Varshney, R. S. Yaduvanshi, Munish Vashishath
Summary: A modified Koch frontier, super wide band antenna is designed and analyzed in terms of both frequency and time domain. By combining a partial ground structure with an asymmetric polygon shape patch, higher order TM modes are excited and merged to provide an impedance bandwidth of 139%. The antenna achieves an average radiation efficiency of 85% throughout the resonating band, and a modified patch shape enables electrical shortening and an operating bandwidth of 12.5 THz with a peak gain of 6 dBi. Additionally, the antenna exhibits monopole behavior for the lower frequencies of the operating bandwidth. Pulse preserving property in the far field radiation is verified with a high fidelity factor of 0.9597.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Vishwanath, Gaurav Varshney, Bikash Chandra Sahana
Summary: In this study, a tunable terahertz circularly-polarized dielectric resonator antenna was implemented and numerically studied. The antenna achieved circular polarization by perturbing the modal field distribution and aligning the electric field vectors. It provided a wide impedance bandwidth and axial ratio bandwidth, and tunability was achieved by modulating the chemical potential of the graphene layer. The antenna exhibited high gain and radiation efficiency, making it suitable for multi-port wireless communication systems.
NANO COMMUNICATION NETWORKS
(2022)
Article
Optics
Vishal Singh, Nallagatla Sri Manasa, Aastha Sinha, Gaurav Varshney, Ajay K. Sharma
Summary: This paper presents a terahertz antenna that achieves multiband response by exciting higher order modes. The antenna uses a graphene strip as a controller or tuner to generate and mitigate resonant modes, allowing for dual, triple, or quadruple operating passbands. The antenna's operation is verified using an electrical equivalent circuit model, and it produces conical or bi-conical radiation beams based on the excited resonant mode.
Article
Chemistry, Physical
Durgesh Kumar, Nagendra Pal, Pushpa Giri, Gaurav Varshney
Summary: This study investigates the manipulation of the response of a terahertz microstrip antenna using a graphene sheet. By placing a graphene sheet of appropriate size and Fermi energy on the top of a metallic radiator, multiple-order surface plasmon resonance (SPR) can be achieved, which, when merged with the resonance of the fringing field, creates a dual-band response and frequency tunability.
Article
Instruments & Instrumentation
Arjun Sharma, Rajveer Yaduvanshi, Anup Kumar, Harshul Jain, Sushmita Bhushan, Saurabh Katiyar, Amit Pandit
Summary: Pigeons are a valuable gift to mankind for their ability to send messages and navigate. However, their droppings and noise can be a nuisance. This paper proposes a solution using a short-range electronic device that emits infrasonic signals, which irritate the pigeons and keep them away from designated areas.
MAPAN-JOURNAL OF METROLOGY SOCIETY OF INDIA
(2023)
Article
Instruments & Instrumentation
Sushmita Bhushan, Rajveer Singh Yaduvanshi
Summary: A 2.4 GHz Jammer has been proposed to prevent inmate communications in prison cells by forming a Wi-Fi communication network. Unlike GSM/CDMA jammers that operate at specific frequencies, 2.4 and 5.8 GHz Jammers have not yet been explored. The proposed structure, which utilizes a dielectric resonator antenna (DRA), has been simulated and tested, and it has the potential to be used for jamming drones involved in illegal activities.
MAPAN-JOURNAL OF METROLOGY SOCIETY OF INDIA
(2023)
Article
Engineering, Electrical & Electronic
Abhishek Kumar, Gaurav Varshney
Summary: A thermally-electrically tunable ultrathin metal-free terahertz absorber has been implemented using phase change material and graphene, providing tunability in frequency and absorption response. The device offers broadband absorption response and stable response for a wide range of angles of incidence.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Physics, Multidisciplinary
Shailza Gotra, V. S. Pandey, Brahmjit Singh
Summary: The paper presents a rectangular aperture coupled dielectric resonator antenna with dual-band circularly polarized response, achieving orthogonal modes excitation at different frequencies through specific geometry and circular slots on the ground plane, resulting in enhanced bandwidth response and gain.
INDIAN JOURNAL OF PURE & APPLIED PHYSICS
(2021)
