Article
Engineering, Electrical & Electronic
Zi-Kang Chen, Li Zhang, Zibin Weng, Rui-Yang Li
Summary: This letter presents a wideband wide-beam rectangular di-electric resonator antenna (DRA) using uniaxial anisotropic material for the first time. By tuning the uniaxial permittivity tensor, the radiation from the top wall of the DRA is enhanced and the gain at low elevation angle in the E-plane is improved. The bandwidth is broadened by merging the feed slot mode and the fundamental TE(111)(y) mode. The addition of a grounded substrate and trapezoidal notches on the ground broadens the half-power beamwidth (HPBW) in the H-plane. The measured results show an impedance bandwidth of 35.7% over a band of 2.65-3.8 GHz with HPBWs of at least 250 degrees and 162 degrees in the E-and H-planes, respectively.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Majedehsadat Rad, Nastouh Nikkhah, Bijan Zakeri, Mohammad Yazdi
Summary: This paper presents two wideband dual-polarized dielectric resonator antennas for X-band radar applications and provides the design process and measurement results. The antennas demonstrate wideband impedance bandwidth and axial ratio, and offer both RHCP and LHCP radiation. They are suitable for various radar applications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Xiyao Liu, Kwok Wa Leung, Nan Yang
Summary: A compact horizontally polarized omnidirectional dielectric resonator antenna excited in the TE011+delta mode is presented, with an enhanced impedance bandwidth and suppressed cross-polar field. This antenna can be polarization reconfigured using diodes to switch between horizontal and vertical polarizations, with stable omnidirectional radiation patterns in both states.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Yan-Ting Liu, Boyuan Ma, Shaode Huang, Shiyan Wang, Zhang Ju Hou, Wen Wu
Summary: This paper presents a wideband low-profile connected rectangular ring dielectric resonator (DR) antenna array for millimeter wave (mmWave) applications. The array consists of four rectangular ring DRA elements excited by microstrip feedlines. Various modes are excited simultaneously to achieve wideband design. The position of the dielectric arms connecting the DRAs has significant effects on the antenna performance. The prototype demonstrates good agreement between measured and simulated results, with a measured impedance bandwidth of 31.6% (22.52-30.97 GHz).
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Changwu Tong, Hauke Ingolf Kremer, Nan Yang, Kwok Wa Leung
Summary: Using dielectric vias, a compact and wide-band circularly polarized dielectric resonator antenna is proposed. The use of high dielectric constant in the vias helps in reducing the size of the antenna. By redistributing the resonant frequencies, the antenna achieves wide impedance and axial ratio bandwidths. The antenna is fabricated using standard PCB process.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Zhen-Xing Xia, Kwok Wa Leung, Pengfei Gu, Rushan Chen
Summary: This study investigates a three-dimensional (3-D)-printed dual-fed dual-frequency dielectric antenna for vehicular communications. The antenna combines a dielectric resonator (DRA) antenna and a dielectric lens antenna, providing good performance in both S- and X-bands for various vehicle communication scenarios.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Zhen-Xing Xia, Kwok Wa Leung
Summary: A new 3-D-printed wideband circularly polarized dielectric resonator antenna (DRA) utilizing two different printing materials is investigated in this study. The antenna features a comb-shaped structure at the top and embedded dielectric strips inside the DRA body to support multiple modes and widen the bandwidth. The prototype antenna, designed and printed for C-band operation, achieves high performance in terms of impedance bandwidth, axial-ratio bandwidth, and antenna gain.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Gagandeep Bharti, Bittu Kumar, Dharmendra Kumar, Anand Sharma
Summary: This article investigates and analyzes a wideband ceramic-based dual port MIMO antenna, which achieves wideband features and triple-band circular polarized waves through the assistance of specially designed ceramic and aperture. Bidirectional pattern diversity is achieved by placing the radiators in opposite directions.
Article
Engineering, Electrical & Electronic
Hauke Ingolf Kremer, Kwok Wa Leung, Mike W. K. Lee
Summary: The low-profile DRA utilizing dielectric and air vias achieves stable radiation performance and wide impedance bandwidth, manufactured entirely using PCB technology. Skillful arrangement of air vias allows control of resonant frequencies for different modes, and the prototype demonstrates a wide impedance bandwidth of 47.5% and a maximum gain of 6.84 dBi. Furthermore, a small antenna footprint and low profile are achieved, with a dual-polarized antenna showing stable radiation performance and high isolation across its passband.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Multidisciplinary Sciences
Mohammad Abedian, Mohsen Khalily, Vikrant Singh, Pei Xiao, Rahim Tafazolli, Ahmed A. Kishk
Summary: A new single-fed circularly polarized dielectric resonator antenna is proposed, achieving wideband CP performance and compensating for beam squint errors through specific design and excitation modes.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Electrical & Electronic
Tian Yang, Jian Ren, Bing Zhang, Yan-Ting Liu, Tianye Ma, Yingzeng Yin
Summary: In this study, a wideband pattern-diversity cylindrical dielectric resonator antenna with high isolation is proposed. By utilizing specific structures and excitation methods, a wide operating bandwidth and diverse radiation patterns are achieved.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Chen Yang, Kwok Wa Leung
Summary: A 3-D-printed wideband circularly polarized (CP) multiple-input-multiple-output (MIMO) antenna is proposed, which consists of two CP dielectric resonator antennas (DRAs) covered by a dielectric decoupler. The center-to-center distance between the two DRAs can be made as small as 0.33?(0) with a high isolation using the decoupler. The measured results of a prototype operating in X-band show a -10-dB impedance bandwidth of 21.7% (8.88-11.04 GHz), with an axial-ratio (AR) bandwidth and mutual coupling both less than 3 and -21.4 dB, respectively. The impedance and AR have a wide overlapping bandwidth of 21.7%.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Jayant Kumar Rai, Pinku Ranjan, Rakesh Chowdhury
Summary: This work presents a frequency reconfigurable wideband rectangular dielectric resonator antenna (RDRA) for 5G applications using a machine learning approach. The concept of machine learning is integrated with reconfigurable DRA for the first time. A novel approach is proposed to achieve wideband and frequency reconfigurability. Frequency reconfigurability is electronically achieved using PIN diode switches and can operate in four different configurations, offering a maximum tuning range of 76.84%. The Extreme Gradient Boosting (XGB) machine learning algorithm provides over 90% accuracy in predicting S11 in all configurations.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Hauke Ingolf Kremer, Kwok Wa Leung, Mike W. K. Lee
Summary: For the first time, dielectric vias were used to design a substrate-integrated dielectric resonator antenna (SIDRA), resulting in a wideband multiring antenna. The wideband behavior is achieved through two different dielectric resonator modes.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Abhijeet Gaonkar, Pragati Patel
Summary: This paper presents a novel compact and wideband tuning fork shaped dielectric resonator antenna (DRA) with augmented design to achieve wide impedance bandwidth. By altering the effective dielectric constant using rectangular-shaped slots and employing the edge grounding technique for compact geometry, the proposed design resonates at specific frequencies and offers a wide impedance bandwidth of 95% at 2.8 GHz. The modified geometry preserves the fundamental mode TEx111 and enhances the surface area to volume ratio, leading to improvements in bandwidth and performance. The proposed design demonstrates a gain of more than 5.5 dBi and a radiation efficiency of over 90% for a wide bandwidth of operation, making it suitable for various wireless applications.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Megh Sainadh Patinavalasa, Laxmi Banoth, Aditi Sharma, Kumar Vaibhav Srivastava, Saptarshi Ghosh
Summary: This letter presents and investigates a polarization-insensitive frequency-selective absorber (FSR) with wideband absorption and in-band transmission characteristics. The proposed FSR consists of one lossy and one lossless resonator, both printed on FR4 substrates and separated by an air spacer. Resistive ink patterns are deposited in the top lossy layer to achieve wideband absorption, improving upon existing FSR structures. The absorptions are observed in the frequency ranges of 1.31-3.22 GHz and 4.88-6.69 GHz, with fractional bandwidths of 84.32% and 31.28% respectively. The bottom lossless layer enables in-band transmission response at 4.05 GHz between the two absorption bands with minimal insertion loss. The proposed FSR is polarization-insensitive and angularly stable, and its design has been validated through fabrication and measurement.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Abhinav Bhardwaj, Dheeraj Pratap, Kumar Vaibhav Srivastava, S. Anantha Ramakrishna
Summary: This article demonstrates the applications and analytical solutions of a cylindrical waveguide filled with inhomogeneous materials. By using the geometric transformation method, different sets of material parameters were obtained. The results show that the analytical and numerical solutions are in good agreement in terms of modal field distributions, cutoff frequencies, and effective mode indices. Additionally, the inhomogeneity can be utilized to reduce the radial dimensions of the waveguide, making it highly desirable for various applications such as sensing, near-field coupling, and MRI.
JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Nitish Kumar Gupta, Gaganpreet Singh, Sapireddy Srinivasu, Harshawardhan Wanare, Kumar Vaibhav Srivastava, J. Ramkumar, S. Anantha Ramakrishna
Summary: In this study, a scheme for distant line-of-sight detection of low-observable targets by solely relying on their nontrivial phase characteristics is proposed, validated, and demonstrated. The presence of a spectral inflection point in the phase response function is identified as the signature of interest, and an algorithm is developed to ascertain the change of curvature information owing to resonant absorption.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Mondeep Saikia, Kumar Vaibhav Srivastava
Summary: This article introduces a method that utilizes the modulation of the transmission or reflection coefficient of a frequency-selective surface (FSS) to modulate electromagnetic (EM) waves, and achieves polarization manipulation which rotates the polarization of the wave upon reflection. These techniques can be used as countermeasures to Radar detection. A prototype of a switchable polarization-rotating FSS is designed, which can switch between co-polarized and cross-polarized reflection, and an EM wave modulation scheme is planned using a periodic signal to switch the polarization state of the FSS. The prototype's response was measured through experiments.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Mohammad Ameen, Raghvendra Kumar Chaudhary
Summary: This paper designs a highly isolated two-port MIMO antenna using hybrid isolation enhancement techniques. First, an epsilon-negative transmission line-inspired antenna with circular polarization (CP) radiation is developed. Then, the same antenna is converted into a two-element MIMO configuration. By inserting multiple defected ground structure-based slots in the antenna ground plane and placing an epsilon-and-mu-near-zero-based metasurface superstrate above the two-port MIMO configuration, higher antenna isolation of 51 dB is achieved. The antenna's performance is analyzed in an actual environmental condition by covering it with a Teflon cavity, and the polarization diversity performance is confirmed.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Engineering, Electrical & Electronic
Mohammad Ameen, Raghvendra Kumar Chaudhary
Summary: This work presents the design and development of a dual-band and dual-polarized epsilon-negative transmission line-inspired antenna for wireless applications. The antenna achieves miniaturization through the implementation of curved meander lines and bandwidth enhancement through the loading of complementary split-ring resonator-based mushroom resonator. Circular polarization radiation is achieved through the loading of two-arm Archimedean spiral resonators. The proposed antenna is suitable for ISM 2.4 GHz, WLAN/WiFi IEEE 802.11 b/g/n, and LTE 2500 applications.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2023)
Article
Computer Science, Information Systems
Anju Kumari Rai, Rahul Kumar Jaiswal, Kahani Kumari, Kumar Vaibhav Srivastava, Chow-Yen-Desmond Sim
Summary: An eight-element wideband MIMO antenna for 5G mobile terminals is proposed. The antenna elements are placed along the long side edges of the terminal with a 6 mm profile. The proposed monopole-inspired antenna shows good performance in terms of impedance match, isolation, and diversity parameter in a wide bandwidth of 78%, covering multiple frequency bands.
Article
Engineering, Electrical & Electronic
Ayushi Dhumal, Mahesh Singh Bisht, Abhinav Bhardwaj, Mondeep Saikia, Sudha Malik, Kumar Vaibhav Srivastava
Summary: Designing and deploying a broadband microwave absorber that provides wide bandwidth RCS reduction for planar and curved surfaces is challenging. We present a resistive ink-based multilayered wideband absorber using a low-priced FR4 substrate to cope with the challenge. The structure achieves a reflection coefficient response below -10 dB over the frequency span of 1.3-18.6 GHz for normally incident electromagnetic waves, and exhibits novelty in terms of wider stealth and electromagnetic compatibility applications.
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
(2023)
Article
Engineering, Electrical & Electronic
Rajkishor Kumar, Avinash Chandra, Sreenath Reddy Thummaluru, Mohammad Monirujjaman Khan, Raghvendra Kumar Chaudhary
Summary: This paper presents a miniaturized planar dual-band short-ended metamaterial antenna with a backed ground plane to improve antenna bandwidths and radiation characteristics. The proposed antenna utilizes a composite right- or left-handed transmission line (CRLH-TL) concept and interdigital capacitance (IDC) to achieve dual-band behavior. The antenna offers compactness, low loss, stable gain, and radiation efficiency, making it suitable for different Wi-MAX applications.
INTERNATIONAL JOURNAL OF ANTENNAS AND PROPAGATION
(2023)
Article
Multidisciplinary Sciences
Rajkishor Kumar, Avinash Chandra, Naveen Mishra, Raghvendra Kumar Chaudhary
Summary: This article investigates a frequency tunable linearly polarized rectangular dielectric resonator antenna (DRA) coupled with a horizontal/vertical-slot and excited with circular-ring type feed. The frequency tunability is achieved by rotating the slot at different angles. Two linearly polarized antennas, named DRA-1 and DRA-2, have been proposed for Wi-MAX and Sub-6 GHz/5G frequency bands, respectively. Both DRAs excite the TE11 and delta modes, confirmed by the orientation of the electric field inside the rectangular DRA. DRA-1 offers a measured-10 dB input impedance bandwidth of 21.60% centered at 2.87 GHz, with co-polarized and cross-polarized field levels separated by more than 24 dB in the broadside direction. DRA-2 offers a measured-10 dB input impedance bandwidth of 23.03% centered at 3.56 GHz, with co-polarized and cross-polarized field levels separated by more than 23 dB in the broadside direction. Additionally, DRA-1 has a maximum gain of 5.23 dBi, while DRA-2 has a maximum gain of 4.75 dBi in the broadside direction.
DEFENCE SCIENCE JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Ranjit Kumar Dutta, Rahul Kumar Jaiswal, Mondeep Saikia, Kumar Vaibhav Srivastava
Summary: A two-stage beamforming technique for wide tilt angles is proposed by combining a Butler matrix with a reconfigurable FSS, which can generate 12 unique radiating beams in 12 distinct directions.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Jyoti Yadav, Mondeep Saikia, Kumar Vaibhav Srivastava, Janakarajan Ramkumar
Summary: The performance of polarization-insensitive absorbers is improved under oblique incidence over wide-angle and wideband by rotating the frequency selective surface (FSS) unit cell in 3-D planes through various rotation schemes. The proposed schemes are realized using 3-D printing technology. A prototype has been fabricated, tested, and validated to verify the simulation response.
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
(2023)
Article
Computer Science, Information Systems
Praneet Jain, Rahul Kumar Jaiswal, Kumar Vaibhav Srivastava, Saptarshi Ghosh
Summary: This article presents a four-port MIMO antenna designed for CR applications, exhibiting interweave and underlay CR techniques through three different working states. The antenna operates in a wide bandwidth for sensing applications, has frequency tunability for interweave CR communication, and a fixed band-notch response for underlay operation. The proposed antenna topology achieves all types of CR operations using the lowest number of diode components.
Proceedings Paper
Telecommunications
Archana Kumari, Raghvendra Kumar Chaudhary
Summary: This paper proposes the design and analysis of an ultrathin frequency selective surface (FSS) based quad-band nearly perfect metamaterial absorber, which offers wide angular stability and polarization insensitivity.
2022 URSI REGIONAL CONFERENCE ON RADIO SCIENCE, USRI-RCRS
(2022)
Proceedings Paper
Telecommunications
Poonam Kumari, Ravi Kumar Gangwar, Raghvendra Kumar Chaudhary
Summary: This paper presents an ultra-wide band antenna with a two steps stair shaped dielectric resonator. The antenna achieves an ultra-wide bandwidth of 136.2% and improves its performance through the use of a parasitic resonator and an artificial magnetic conductor.
2022 URSI REGIONAL CONFERENCE ON RADIO SCIENCE, USRI-RCRS
(2022)
