Prayoot Akkaraekthalin
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View article: Capacitance Characteristics of Glass-Embedded Interdigitated Capacitors for Touch Sensing Applications
Capacitance Characteristics of Glass-Embedded Interdigitated Capacitors for Touch Sensing Applications Open
This paper investigates the capacitance characteristics of a glass-embedded interdigitated capacitive sensor (IDCS) for touch-sensing applications. The study analyzes both baseline (no-touch) and touch-induced capacitance variations throug…
View article: Additive Manufacturing of a Passive Beam-Steering Antenna System Using a 3D-Printed Hemispherical Lens at 10 GHz
Additive Manufacturing of a Passive Beam-Steering Antenna System Using a 3D-Printed Hemispherical Lens at 10 GHz Open
This paper presents a novel mechanically beam-steered antenna system for 10 GHz applications, enabled by multi-material 3D-printing technology. The proposed design eliminates the need for complex electronic circuitry by integrating a mecha…
View article: A Flexible and Compact UWB MIMO Antenna with Dual-Band-Notched Double U-Shaped Slot on Mylar® Polyester Film
A Flexible and Compact UWB MIMO Antenna with Dual-Band-Notched Double U-Shaped Slot on Mylar® Polyester Film Open
Ultra-wideband (UWB) technology is a crucial facilitator for high-data-rate wireless communication due to its extensive frequency spectrum and low power consumption. Simultaneously, multiple-input multiple-output (MIMO) systems have garner…
View article: The low-profile all-textile UWB antenna with AMC for WBAN Applications
The low-profile all-textile UWB antenna with AMC for WBAN Applications Open
This paper presents a low-profile ultra-wideband (UWB) antenna with artificial magnetic conductor (AMC), designed wireless body area network (WBAN) applications. The use of all- textile materials both substrate and conductive elements in a…
View article: 220–325GHz All-Photopolymer Bragg Horn Antennas Towards Eco-Friendly Terahertz Applications
220–325GHz All-Photopolymer Bragg Horn Antennas Towards Eco-Friendly Terahertz Applications Open
This paper presents the development of the world’s first high-gain, all-photopolymer Bragg horn antennas explicitly designed for the WR-3.4 band (220–325GHz), marking a groundbreaking advancement in terahertz (THz) antenna technology. Unli…
View article: A Triband Wearable Antenna for Location Tracking Using Cospas-Sarsat and GNSS
A Triband Wearable Antenna for Location Tracking Using Cospas-Sarsat and GNSS Open
This paper presents the design of a tri-band antenna operating in the Cospas-Sarsat (C-S) and GPS/GNSS bands applicable for the Internet of Things (IoT). Implemented with flexible and robust materials, the antenna operates in three distinc…
View article: Metasurface-Loaded Biodegradable Mobile Phone Back Cover for Enhanced Radiation Performance
Metasurface-Loaded Biodegradable Mobile Phone Back Cover for Enhanced Radiation Performance Open
This article introduces a novel biodegradable metasurface-loaded mobile phone back cover designed to reduce electromagnetic exposure and enhance antenna performance. The cover operates across the low GHz band (2–8 GHz) and the millimeter-w…
View article: High-Isolation Twin-Cluster Fan-Blade Metasurface-Embedded Wideband CP MIMO Antenna With Shorting-Pin Vias for IoT Applications
High-Isolation Twin-Cluster Fan-Blade Metasurface-Embedded Wideband CP MIMO Antenna With Shorting-Pin Vias for IoT Applications Open
This study proposes a twin-cluster fan-blade metasurface (MTS)-embedded wideband circularly polarized (CP) multiple-input multiple-output (MIMO) antenna incorporating shorting-pin vias for Internet of Things (IoT) applications. The antenna…
View article: Multiwavelength Characterization of Optical Wireless Communication in Complex Water-Filled Pipe Environment
Multiwavelength Characterization of Optical Wireless Communication in Complex Water-Filled Pipe Environment Open
This paper presents an in-depth investigation of optical wireless communication through water-filled PVC pipelines using high-brightness light-emitting diodes (HB-LEDs) operating at visible wavelengths: 475 nm (blue), 528 nm (green), 583 n…
View article: Quad-Mode H-Beam Metasurface-Embedded Dual-Band Circularly-Polarized Multi-Tiered Antenna Scheme With 5G (n79) and Wi-Fi 6E Capabilities
Quad-Mode H-Beam Metasurface-Embedded Dual-Band Circularly-Polarized Multi-Tiered Antenna Scheme With 5G (n79) and Wi-Fi 6E Capabilities Open
This research proposes a quad-mode H-beam metasurface (MTS)-embedded dual-band circularly-polarized (CP) multi-tiered antenna scheme with 5G (n79) and Wi-Fi 6E capabilities. The proposed antenna scheme consists of three layers of corner-tr…
View article: Review of Positioning Technologies and Antenna Designs for Indoor, Outdoor, and Wearable Applications
Review of Positioning Technologies and Antenna Designs for Indoor, Outdoor, and Wearable Applications Open
This paper presents a systematic review of positioning technologies and antenna designs for indoor and outdoor applications. The indoor positioning analysis focuses on RF-based systems including Bluetooth Low Energy (BLE), ultra-wideband (…
View article: Planar Pyramidal Horn Antenna Without Any E-Plane Flaring for 5G Applications
Planar Pyramidal Horn Antenna Without Any E-Plane Flaring for 5G Applications Open
This paper presents, for the first time, a planar implementation of a pyramidal horn antenna for 5G millimeter-wave (mmWave) applications. A substrate integrated waveguide (SIW) based planar H-plane horn antenna is designed and judiciously…
View article: A Dual-Band Low SAR Microstrip Patch Antenna with Jean Substrate for WBAN Applications
A Dual-Band Low SAR Microstrip Patch Antenna with Jean Substrate for WBAN Applications Open
This paper presents a low-profile dual-band microstrip patch antenna operated at the 2.45/5.8 GHz ISM bands, targeting wireless body area network (WBAN) applications. The proposed antenna is fabricated on a jean substrate measuring 74×82 m…
View article: Miniaturized Multiband EBG Reflector Using DICPW Structure for Wireless Communication Systems
Miniaturized Multiband EBG Reflector Using DICPW Structure for Wireless Communication Systems Open
Wireless communication technology evolves to meet current needs, focusing on antenna size reduction for smaller, multi-frequency devices. This research introduces a novel approach to miniaturizing a multiband Electromagnetic Band Gap (EBG)…
View article: 5.58-GHz Modified Jerusalem Patch Sensor for 1%-Precision Ethanol and Methanol Discrimination in Disinfectant Solutions
5.58-GHz Modified Jerusalem Patch Sensor for 1%-Precision Ethanol and Methanol Discrimination in Disinfectant Solutions Open
This paper presents a state-of-the-art planar microwave sensor designed for highly precise alcohol characterization in aqueous solutions, with a primary focus on its application in COVID-19 disinfectants. Modified from the Jerusalem patch,…
View article: Dual-Mode Characteristic Based on Miniaturized Metamaterial for Multiband Operation Utilizing Double-Layer Interdigital and Trisection Step-Impedance Techniques
Dual-Mode Characteristic Based on Miniaturized Metamaterial for Multiband Operation Utilizing Double-Layer Interdigital and Trisection Step-Impedance Techniques Open
This paper presents a dual-mode characteristic for miniaturized metamaterial with a unit cell design based on an interdigital coplanar waveguide (ICPW) combined with trisection step-impedance to enable the three resonant frequency response…
View article: A Miniaturized Multiband FSS Director Using Double Layer With ICPW Technique Structure for Wireless Communication Systems
A Miniaturized Multiband FSS Director Using Double Layer With ICPW Technique Structure for Wireless Communication Systems Open
This paper presents a multiband director based on the frequency selective surface (FSS) unit cell structure using the double layer with interdigital CPW (ICPW) technique. The unit cell consists of the front and the back. The front part has…
View article: Dual‐Band Reflectarray Antennas Using Integrated Resonant and Non‐Resonant Natures of Metallic Waveguide Elements at Millimeter Wave Frequencies
Dual‐Band Reflectarray Antennas Using Integrated Resonant and Non‐Resonant Natures of Metallic Waveguide Elements at Millimeter Wave Frequencies Open
Pure metallic reflectarray antennas have good power efficiency and low fabrication cost, limited to single‐band operation in the past. A dual‐band reflectarray antenna is developed for two directional beams by two feeds. The reflecting ele…
View article: An Additive 3D-Printed Hemispherical Lens With Flower-Shaped Stub Slot Ultra-Wideband Antenna for High-Gain Radiation
An Additive 3D-Printed Hemispherical Lens With Flower-Shaped Stub Slot Ultra-Wideband Antenna for High-Gain Radiation Open
This paper presents a 3D-printed hemispherical lens integrated with a planar ultra-wideband (UWB) antenna. The flower-shaped stub slot UWB antenna is made of 0.8-mm FR-4. The operating frequency of the UWB covers 3.10 GHz – 11.6 GHz with a…
View article: A Dimension Estimation Method for Rigid and Flexible Planar Antennas Based on Characteristic Mode Analysis
A Dimension Estimation Method for Rigid and Flexible Planar Antennas Based on Characteristic Mode Analysis Open
An empirical method for simplified dimension estimation of patch antennas is proposed in this work based on characteristic mode analysis (CMA). This method involves generating formulae to calculate substrate-independent antenna patch width…
View article: Dual-band Reflectarray Antennas Using Integrated Resonant and Non-Resonant Natures of Metallic Waveguide Elements at Millimeter Wave Frequencies
Dual-band Reflectarray Antennas Using Integrated Resonant and Non-Resonant Natures of Metallic Waveguide Elements at Millimeter Wave Frequencies Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Radio Science. ESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about prepri…
View article: Hierarchical Knee Image Synthesis Framework for Generative Adversarial Network: Data From the Osteoarthritis Initiative
Hierarchical Knee Image Synthesis Framework for Generative Adversarial Network: Data From the Osteoarthritis Initiative Open
Medical images synthesis is useful to address persistent issues such as the lack of training data diversity and inflexibility of traditional data augmentation faced by medical image analysis researchers when developing their deep learning …
View article: Design and Analysis of Antipodal Vivaldi Antennas for Breast Cancer燚etection
Design and Analysis of Antipodal Vivaldi Antennas for Breast Cancer燚etection Open
This paper presents the design and analysis of antipodal Vivaldi antennas (AVAs) for breast cancer detection. In order to enhance the antenna gain, different techniques such as using the uniform and non-uniform corrugation, expanding the d…
View article: A Multiband FSS Director Using Aperture Interdigital Structure for Wireless Communication Systems
A Multiband FSS Director Using Aperture Interdigital Structure for Wireless Communication Systems Open
This research paper proposes a multi-band frequency selective surface (FSS) director using the aperture interdigital technique. The FSS unit cell has been designed based on a basic bandpass filter (BPF) connected with an interdigital struc…
View article: Numerical Analysis of Users’ Body Effects on a Fourteen-Element Dual-Band 5G MIMO Mobile Terminal Antenna
Numerical Analysis of Users’ Body Effects on a Fourteen-Element Dual-Band 5G MIMO Mobile Terminal Antenna Open
This paper studies the performance of a 14-element dual-band 5G MIMO antenna with body effect and an antenna selection. The antenna operates in the lower frequency band from 3.10 to 3.85 GHz for 5G bands of LTE 42 and 43, whereas the upper…
View article: Properties and Performance Verification on Magnetite Polydimethylsiloxane Graphene Array Microwave Sensor
Properties and Performance Verification on Magnetite Polydimethylsiloxane Graphene Array Microwave Sensor Open
This paper investigates the use of a Magnetite Polydimethylsiloxane (PDMS) Graphene array sensor in ultra-wide band (UWB) spectrum for microwave imaging applications operated within 4.0–8.0 GHz. The proposed array microwave sensor comprise…
View article: Ganoderma boninense Disease Detection by Near-Infrared Spectroscopy Classification: A Review
Ganoderma boninense Disease Detection by Near-Infrared Spectroscopy Classification: A Review Open
Ganoderma boninense (G. boninense) infection reduces the productivity of oil palms and causes a serious threat to the palm oil industry. This catastrophic disease ultimately destroys the basal tissues of oil palm, causing the eventual deat…
View article: Wideband dielectric properties of silicon and glass substrates for terahertz integrated circuits and microsystems
Wideband dielectric properties of silicon and glass substrates for terahertz integrated circuits and microsystems Open
This paper presents a comprehensive study of the optical and electrical dielectric material properties of six commonly-used silicon and glass substrates at terahertz (THz) frequencies, including refractive index, absorption coefficient, di…