Vol. 116
Latest Volume
All Volumes
PIERM 128 [2024] PIERM 127 [2024] PIERM 126 [2024] PIERM 125 [2024] PIERM 124 [2024] PIERM 123 [2024] PIERM 122 [2023] PIERM 121 [2023] PIERM 120 [2023] PIERM 119 [2023] PIERM 118 [2023] PIERM 117 [2023] PIERM 116 [2023] PIERM 115 [2023] PIERM 114 [2022] PIERM 113 [2022] PIERM 112 [2022] PIERM 111 [2022] PIERM 110 [2022] PIERM 109 [2022] PIERM 108 [2022] PIERM 107 [2022] PIERM 106 [2021] PIERM 105 [2021] PIERM 104 [2021] PIERM 103 [2021] PIERM 102 [2021] PIERM 101 [2021] PIERM 100 [2021] PIERM 99 [2021] PIERM 98 [2020] PIERM 97 [2020] PIERM 96 [2020] PIERM 95 [2020] PIERM 94 [2020] PIERM 93 [2020] PIERM 92 [2020] PIERM 91 [2020] PIERM 90 [2020] PIERM 89 [2020] PIERM 88 [2020] PIERM 87 [2019] PIERM 86 [2019] PIERM 85 [2019] PIERM 84 [2019] PIERM 83 [2019] PIERM 82 [2019] PIERM 81 [2019] PIERM 80 [2019] PIERM 79 [2019] PIERM 78 [2019] PIERM 77 [2019] PIERM 76 [2018] PIERM 75 [2018] PIERM 74 [2018] PIERM 73 [2018] PIERM 72 [2018] PIERM 71 [2018] PIERM 70 [2018] PIERM 69 [2018] PIERM 68 [2018] PIERM 67 [2018] PIERM 66 [2018] PIERM 65 [2018] PIERM 64 [2018] PIERM 63 [2018] PIERM 62 [2017] PIERM 61 [2017] PIERM 60 [2017] PIERM 59 [2017] PIERM 58 [2017] PIERM 57 [2017] PIERM 56 [2017] PIERM 55 [2017] PIERM 54 [2017] PIERM 53 [2017] PIERM 52 [2016] PIERM 51 [2016] PIERM 50 [2016] PIERM 49 [2016] PIERM 48 [2016] PIERM 47 [2016] PIERM 46 [2016] PIERM 45 [2016] PIERM 44 [2015] PIERM 43 [2015] PIERM 42 [2015] PIERM 41 [2015] PIERM 40 [2014] PIERM 39 [2014] PIERM 38 [2014] PIERM 37 [2014] PIERM 36 [2014] PIERM 35 [2014] PIERM 34 [2014] PIERM 33 [2013] PIERM 32 [2013] PIERM 31 [2013] PIERM 30 [2013] PIERM 29 [2013] PIERM 28 [2013] PIERM 27 [2012] PIERM 26 [2012] PIERM 25 [2012] PIERM 24 [2012] PIERM 23 [2012] PIERM 22 [2012] PIERM 21 [2011] PIERM 20 [2011] PIERM 19 [2011] PIERM 18 [2011] PIERM 17 [2011] PIERM 16 [2011] PIERM 14 [2010] PIERM 13 [2010] PIERM 12 [2010] PIERM 11 [2010] PIERM 10 [2009] PIERM 9 [2009] PIERM 8 [2009] PIERM 7 [2009] PIERM 6 [2009] PIERM 5 [2008] PIERM 4 [2008] PIERM 3 [2008] PIERM 2 [2008] PIERM 1 [2008]
2023-05-11
PIER M
Vol. 116, 165-176, 2023
download: 226
Hyperbolic Graded Index Biophotonic Cholesterol Sensor with Improved Sensitivity
Diptimayee Dash and Jasmine Saini
A novel approach is presented to achieve improved sensing performance using a one-dimensional (1D) hyperbolic graded photonic crystal (PC). The graded structure achieves refractive index modulation that varies hyperbolically with layer depth, due to its graded index geometry. Porous materials are employed to facilitate analyte infiltration. The reflectivity and sensing performance of the proposed graded and non-graded geometry is evaluated using the transfer matrix method (TMM). The Sensing capability of the graded structure is evaluated analytically by infusing different analytes within the cavity, considering various cavity widths and incidence angles. At a 40-degree angle of incidence, the analytical results demonstrate that the suggested graded structure exhibits a maximum sensitivity of 469 nm/RIU, along with a detection limit and FOM of 9.1×10-3 and 125 RIU-1, respectively. The detailed electric field confinement of the graded geometry is also carried out at the interface. The proposed structure outperforms conventional non-graded structures with a 114% higher sensitivity. The bio-photonic design can easily be implemented and provides high performance compared to previous works that employ exponentially graded structures. The suggested biosensor can detect even minor fluctuations in the refractive index of blood serum samples with different cholesterol concentrations.
Hyperbolic Graded Index Biophotonic Cholesterol Sensor with Improved Sensitivity
2023-05-09
PIER M
Vol. 116, 155-164, 2023
download: 398
Design and Verification of Noninvasive Wearable Continuous Blood Glucose Monitoring System for Smartwatches
Pratik J. Mhatre and Manjusha Joshi
In this paper, we propose a noninvasive blood glucose monitoring system that can be easily integrated into smartwatches. This system makes use of dielectric properties of blood-flow in human blood vessels as well as frequency dependency of blood glucose. To prove the proposed design principle, authors have verified the system working with vector network analyser and a directional coupler. The entire system design is explained in this paper. At the time of final system integration, the vector network analyser and directional coupler can be replaced with other on-chip sensors. Authors have also compared the obtained results with finger pricking based blood-glucose measurement. The results agree and have been tabulated. Clarke error grid was also used to evaluate proposed system accuracy.
Design and Verification of Noninvasive Wearable Continuous Blood Glucose Monitoring System for Smartwatches
2023-04-30
PIER M
Vol. 116, 145-154, 2023
download: 208
A Triband Hexagonal Shaped Polarization Insensitive Absorber by Tuning Graphene Material in Terahertz Frequency Domain
Nagandla Prasad , Pokkunuri Pardhasaradhi , Boddapati Taraka Phani Madhav , Vysyaraju Lokesh Raju and Pucha Poorna Priya
Terahertz era is becoming a more prominent and expanding platform for a variety of applications. In this paper, we propose a triband absorber with a hexagon-shaped radiating patch for THz applications. The proposed structure has three layers: a hexagonal patch made of graphene as a radiating patch, a silicon layer as a dielectric substrate, and a bottom conductive layer made of gold to prevent EM wave transmission. The proposed structure operates at three resonant frequencies 0.38 THz, 1.23 THz, and 1.77 THz respectively. We may accomplish maximum absorption level (above 90%) and maximum absorption bandwidth by setting relevant chemical potential and relaxation times to 0.2 ev and 0.2 ps respectively. The proposed structure contains a lossy silicon substrate, which has a dielectric constant of 11.9 and a loss tangent of 2.5e-004. The proposed structure reveals a larger absorption [above 90%] for the operating frequencies, and the effect on absorbance for different modes is illustrated.
A Triband Hexagonal Shaped Polarization Insensitive Absorber by Tuning Graphene Material in Terahertz Frequency Domain
2023-04-19
PIER M
Vol. 116, 129-143, 2023
download: 208
Multiphysics Analysis of High Frequency Transformers Used in SST with Different Magnetic Materials
Sherin Joseph , Shajimon Kalayil John , Kudilil Prasad Pinkymol , Jineeth Joseph and Kappamadathil Raman Muraleedharan Nair
Solid State Transformers (SSTs) are emerging as the major component of smart grid system. High Frequency Transformer (HFT) is the key element of SST. The optimum design of SST is a critical task due to the complex design of magnetic, electric and dielectric circuits of high frequency transformer and due to the design of power electronic circuits used at either sides of HFT. The most significant among above is the design of magnetic circuit and the possibility of using different magnetic materials for high frequency application. This paper discusses the performance analysis of HFT for different magnetic materials used for core construction. The magnetic materials considered in this analysis are amorphous, nanocrystalline and si-steel. Optimum HFT design is selected from a set of designs using an iterative algorithm, considering each core material separately. Validation of the design is done in Finite Element Method (FEM) analysis software. The design of a high frequency transformer, which is integrated in 1000 kVA 11 kV/415 V SST, is investigated both analytically and numerically, with optimum designs developed using three core materials.
Multiphysics Analysis of High Frequency Transformers Used in SST with Different Magnetic Materials
2023-04-17
PIER M
Vol. 116, 119-128, 2023
download: 147
A Local Two-Port Interferometer to Detect Radio-Vortices at 30 GHz
Lorenzo Scalcinati , Bruno Paroli , Mario Zannoni , Massimo Gervasi and Marco Alberto Carlo Potenza
In this work we show a novel method based on a local two-port interferometer to distinguish the topological charge of radio-vortices at 30 GHz by using a small portion of the entire wavefront only. The experimental investigation of the amplitude and phase properties of the interference pattern with a pure Gaussian beam (l = 0) and a l = 1 radio vortex is carried out, and results are compared with the theory based on Laguerre-Gauss modes. Experiments were performed both with the interferometer and with single antenna to highlight the effective benefits of the interferometric approach, sensitive to the azimuthal phase of the vortex field. Method is also extendable at higher topological charges for applications to high-density millimetric communications.
A Local Two-Port Interferometer to Detect Radio-vortices at 30 GHz
2023-04-12
PIER M
Vol. 116, 103-118, 2023
download: 145
Structure of the Field Behind a Dielectric Circular Cylinder in the Lit Side of the Transition Region
Xin Du and Jun-Ichi Takada
Prediction in the transition region between lit and shadowed regions is important for maintaining stable mobile communication for the beyond 5th generation. In this paper, as the difference between the reflection and diffraction from a dielectric circular cylinder and an absorber screen, respectively, a novel additional term is derived by a uniform theory of diffraction (UTD) in the lit side of the transition region. The proposed model is validated by the UTD and exact solutions of a dielectric circular cylinder. Through the proposal, we can separate the contribution of the shadowed Fresnel zone (FZ) number and boundary conditions (i.e., the surface impedance and the polarization) to the total field. The frequency characteristics of the shadowed FZ and boundary conditions are theoretically analyzed. The analyzed results show that the contributions of the boundary conditions are weaker than the shadowed FZ in the lit region at a high frequency.
Structure of the Field behind a Dielectric Circular Cylinder in the Lit Side of the Transition Region
2023-04-09
PIER M
Vol. 116, 91-102, 2023
download: 195
Design of Conformal Log Periodic Dipole Array Antennas Using Different Shapes of Top Loadings
Swetha Velicheti , Pavada Santosh , Prudhivi Mallikarjuna Rao and Mosa Satya Anuradha
Planar and conformal log periodic dipole array (LPDA) antennas are proposed in this paper with circular patch and hexagonal patch top loadings for multiband applications. Due to these top loadings, the size of the antennas is reduced, and the total dimensions of the two antennas are 44 mm x 40 mm. These antennas are fabricated on polyimide material with a dielectric constant of 3.3 and thickness of 0.1 mm. These two antennas resonate at 3.5 GHz, 5.7 GHz, 7.5 GHz and 9.3 GHz frequencies in both planar and conformal modes. The antenna characteristics of the proposed antenna models such as reflection coefficient, VSWR, radiation pattern, and gain are analyzed, and the measured results are in good agreement with simulation ones.
Design of Conformal Log Periodic Dipole Array Antennas Using Different Shapes of Top Loadings
2023-04-05
PIER M
Vol. 116, 77-89, 2023
download: 539
A Compact Reconfigurable Multi-Frequency Patch Antenna for LoRa IoT Applications
Muhammad Sani Yahya , Socheatra Soeung , Francis Emmanuel Chinda , Sharul Kamal Bin Abd Rahim , Umar Musa , Nursyarizal B. M. Nor and Sovuthy Cheab
In this study, a compact, reconfigurable, and high-efficiency Long Range (LoRa) patch antenna, which is novel, is presented for Internet of Things (IoT) applications. The antenna is designed to operate at the three major frequencies used for LoRa communication, namely 915 MHz, 868 MHz, and 433 MHz, which are widely employed for global LoRa connectivity. The compact size and impedance matching of the antenna are achieved through the use of meandered radiating patches, a partial ground plane, and a ground plane stub. The antenna is prototyped on a commercially available and cost-effective FR-4 material and measures 80 mm x 50 mm x 1.6 mm (0.12λ x 0.07λ at the lowest resonant frequency), which is smaller than the size of a standard credit card. The antenna utilizes three RF PIN diodes (SW1, SW2, and SW3) for frequency reconfiguration, which are characterized by low insertion loss and fast switching time. The RLC equivalent circuit of the antenna was validated through simulations and measurements, yielding the peak gain and radiation efficiency of 2.1 dBi and >90%, respectively. These results prove that the antenna is a promising solution for LoRa IoT applications in terms of size, cost, and performance, filling a gap in the existing literature of LoRa MPAs that are typically large, non-reconfigurable, low-gain, and single-band.
A Compact Reconfigurable Multi-frequency Patch Antenna for LoRa IoT Applications
2023-04-03
PIER M
Vol. 116, 53-63, 2023
download: 357
Multiband Antenna for GPS, IRNSS, Sub-6 GHz 5G and WLAN Applications
Devendra H. Patel and Gautam Durlabhji Makwana
An elliptical shape multi-band microstrip patch antenna with narrow semicircle cuts and bulges on two horizontal ends is proposed for Global Positioning System (GPS), Indian Regional Navigation Satellite System (IRNSS), Sub-6 GHz 5G and Wireless Local-Area Network (WLAN) wireless communication applications. The proposed antenna operates at 1.56 GHz, 2.49 GHz, 3.5 GHz, and 5.24 GHz for desired applications, respectively. The proposed antenna, fed by coaxial feeding mounted on Rogers AD255C substrate, has optimized physical dimensions of 80×80×3.175 mm3. The semicircle cuts and bulges on horizontal ends on the elliptical element contribute to exciting higher-order modes and affect the current distribution at the resonant frequencies resulting in producing multi-band operations. The antenna is fabricated and tested. The measured return loss characteristic (S11) below -10 dB is -14.58 dB, -18.80 dB, -22.25 dB, & -27.03 dB, with the radiation efficiency of 58.7%, 94.8%, 93.2%, & 84.9% and peak gain of 3.49 dBi, 6.49 dBi, 4.93 dBi & 4.36 dBi for desired application band, respectively. The proposed antenna also offers impedance bandwidths of 40 MHz (1.55-1.59 GHz), 90 MHz (2.43-2.52 GHz), 100 MHz (3.44-3.54 GHz) & 90 MHz (5.23-5.32 GHz) at resonant frequencies and relatively stable radiation patterns. Simulated and measured results for the proposed antenna exhibit good agreement. The proposed multi-band antenna offers a simple design and improved performance.
Multiband Antenna for GPS, IRNSS, Sub-6 GHz 5G and WLAN Applications
2023-04-02
PIER M
Vol. 116, 39-52, 2023
download: 264
Design and Analysis of a Frequency Selective Surface Loaded Bioinspired Antenna in Frequency and Time Domains
Anett Antony and Bidisha Dasgupta
The paper addresses a bioinspired printed antenna in the shape of a `Lotus' which is further loaded with a new type of Frequency Selective Surface (FSS) structure with unit cell dimension as 0.16λ0×0.16λ0×0.033λ0, where λ0 is the lowest operating wavelength. The two dissimilar layers of FSS, which are separated by an air gap of about 3.2 mm, have been placed below the antenna. The combined structure operates over 3.8 GHz to 14.4 GHz (116.5% measured) with peak realized gain of 7.5 dBi. The introduction of the FSS layer provides gain enhancement of about 5.9 dBi. The standalone FSS geometry provides a wide transmission bandwidth from 5.5 to 12.5 GHz along with good angular stability of about 50º. The Gielissuper formula has been used to develop the petal of the lotus shaped antenna. The time domain analysis of the lotus shaped antenna has also been provided. The proposed structure can be used as an electromagnetic sensor for wide band applications over C, X and partially Ku bands.
Design and Analysis of a Frequency Selective Surface Loaded Bioinspired Antenna in Frequency and Time Domains
2023-03-11
PIER M
Vol. 116, 1-10, 2023
download: 161
A Polarization Reconfigurable Rectangular Dielectric Resonator Antenna Using PIN Diode for X-Band Applications
Akrem Amar Soltan , Salam Khamas and Salman Majid Salman
A polarization reconfigurable dielectric resonator Antenna (DRA) is proposed for X-band applications. The antenna provides circularly polarized (CP) or linearly polarized (LP) radiations at the same frequency band. Altering the states of two PIN diode switches offers a choice of one of three polarization options: (i) LP radiation; (ii) left-hand CP (LHCP) radiation; (iii) right-hand CP (RHCP) radiation. The simulations and measurements are in close agreement, indicating that the LHCP and RHCP radiations have reconfigurable polarization traits with a 21.3% impedance bandwidth ranging from 9.6 to 11.9 GHz and a 3.4% for the LP radiation that extends from 10.2 to 10.5 GHz. There is simultaneously a maximum gain of 6.9 dBic with a circa 4% axial ratio (AR) bandwidth for the LHCP and RHCP radiations.
A Polarization Reconfigurable Rectangular Dielectric Resonator Antenna Using PIN Diode for X-band Applications
2023-05-15
PIER M
Vol. 116, 177-191, 2023
download: 231
EMT Image Reconstruction Based on Composite Sensitivity Matrix and Its Application in Defect Detection of Carbon Fiber Wound Hydrogen Tank
Ming Ma , Qiong Zhang , Ronghua Zhang , Shiyu Liu , Yi Wu and Bailiang Chen
Carbon fiber wound hydrogen tanks are widely used in the field of new energy, but their complex multilayer structure makes it difficult to conduct nondestructive testing/structural health monitoring (NDT/SHM). In this paper, electromagnetic tomography (EMT) is used for noncontact in situ defect detection on a carbon fiber wound hydrogen tank. According to its structural characteristics, an open U-shaped sensor array that fits the curvature of the tank body is designed. To improve the quality of reconstructed images, an iterative image reconstruction algorithm based on a composite sensitivity matrix (CSM) is proposed. To verify the performance of the method, the method in this paper is compared with linear back projection (LBP), the Landweber iterative algorithm and the Tikhonov regularization algorithm, and the image quality is evaluated by comparing the image relative error and correlation coefficient. Both simulated and experimental results show that the method proposed in this paper is more accurate in defect localization and higher in quality than traditional image reconstruction algorithms.
EMT Image Reconstruction Based on Composite Sensitivity Matrix and Its Application in Defect Detection of Carbon Fiber Wound Hydrogen Tank
2023-04-04
PIER M
Vol. 116, 65-75, 2023
download: 169
Three-Dimensional Near-Field Pattern Shaping Antenna Array with Arbitrary Focus Configuration
Qiaojiang Xia , Xiao Cai , Zhu Duan and Wen Geyi
In this paper, a 24-element microstrip antenna array with three-dimensional near-field pattern shaping capability for microwave hyperthermia is presented. The antenna array operating at 2.45 GHz is designed based on the weighted constrained method of the maximum power transmission efficiency (WCMMPTE). By setting proper constraints for the electric field distribution of several selected points within the target area, the three-dimensional (3D) shape of the electric field can be characterized, meanwhile ensuring that the power is maximally concentrated in this area. Moreover, the shape, size, and spatial location of the three-dimensional area are all adjustable according to the selection of those specific points, making the array quickly adaptable for different actual requirements. The electric field distribution of the preset 3D shape can be focused at center or off-center with optimized excitations fed into the array. The measured electric field distribution shows that the transmitting array antenna is able to achieve a preset 3D shape of the electric field distribution as well as a preset offset position in the desired direction, agreeing very well with the simulations.
Three-dimensional Near-field Pattern Shaping Antenna Array with Arbitrary Focus Configuration
2023-03-29
PIER M
Vol. 116, 23-38, 2023
download: 194
Design and Optimization of Quasi-Constant Coupling Coefficients for Superimposed Dislocation Coil Structures for Dynamic Wireless Charging of Electric Vehicles
Zhongqi Li , Xinbo Xiong , Liquan Ren , Pengsheng Kong , Yang Zhang and Junjun Li
In the dynamic wireless charging system of electric vehicles, the misalignment between transmitting and receiving coils will cause drastic changes in the coupling coefficient, which will lead to system instability. A dynamic and static wireless power transfer system superimposed dislocation coil (SDC) structure is proposed in this paper. This structure ensures a constant coupling coefficient between the transmitting and receiving coils of the dynamic and static wireless power transfer system for electric vehicles. Firstly, the variation law of the coupling coefficient of the SDC structure is analyzed. Secondly, a quasi-constant coupling coefficient optimization method is proposed based on the SDC structure to obtain the coil parameters that meet the requirements. Finally, according to the optimization results, an experimental platform for wireless power transfer based on the SDC structure is built. The experimental results show that the maximum fluctuation rate of the inter-coil coupling coefficient is only 3.12% when the misalignment between the transmitting coil and the receiving coil is within half of the outer length of the transmitting coil. Thus, the correctness and effectiveness of the proposed structure and method are verified.
Design and Optimization of Quasi-Constant Coupling Coefficients for Superimposed Dislocation Coil Structures for Dynamic Wireless Charging of Electric Vehicles
2023-03-27
PIER M
Vol. 116, 11-21, 2023
download: 234
High-Sensitivity Temperature Sensor Based on Surface Plasmon Resonance Photonic Crystal Fiber
Hai Ping Li , Juan Ruan , Xin Li , Guangyong Wei and Tao He
A high-sensitivity photonic crystal fiber (PCF) Temperature sensor based on surface plasmon resonance (SPR) with a high figure of merit (FOM) is proposed. Compared with most optical fiber inner air holes coated with metal or placed with metal nanowires, owing to the plasma material directly contacting the analyte, the annular channel outside the cladding is convenient for analyte detection, and the sensor is easier to manufacture. The temperature-sensitive liquid is a mixed solution of ethanol and chloroform with a volume ratio of 1:1. The results indicate that the highest sensitivity of this sensor can reach 15.4 nm/˚C, and the maximum FOM is 0.2829/˚C between -10˚C and 60˚C. Furthermore, the influence of photonic crystal fiber air hole size, gold film thickness, and other parameters on the performance of the sensor is analyzed.
High-sensitivity Temperature Sensor Based on Surface Plasmon Resonance Photonic Crystal Fiber