Doyoung Jang

Design of a printed dipole array for radar and satellite communication

Seungbae Ahn, Doyoung Jang, Sungjun Yoo

Design of 3D-Printed High-Durability and Ultralightweight Antennas Using Structural and Electromagnetic Analysis

Doyoung Jang, Hyewon Choi, Tae Hoon Yoo

This study proposes a three-dimensional (3D)-printed antenna that achieves high durability and ultra lightweight characteristics by integrating 3D printing-based additive manufacturing and an electromagnetic-structural analysis technique. The proposed antenna is based on a circular disc monopole structure, which is renowned for its …

Design of a Highly Durable X-Band Array Antenna for Military Radar Systems

En-yeal Yim, Doyoung Jang, Hosung Choo

In this paper, we propose a design technique for a highly durable X-band array antenna operating in the harsh maritime environment of military ships. To dramatically enhance the durability of the antenna elements, we employ a highly durable feed-pin structure consisting of …

Analysis of Path Loss and Clutter Power for Wind Speeds Using the Parabolic Equation Method and Ocean Spectra Models

Taekyeong Jin, Doyoung Jang, Nammoon Kim, Hosung Choo

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Axial Virtual Transmit Source Configuration for Optimized Diverging-Wave Imaging in Ultrasound

Jaebum Park, Doyoung Jang, Heechul Yoon, Tai‐Kyong Song

Diverging-wave (DW) ultrasound imaging is a promising technique that provides both wide imaging views and high frame rates. This study analytically and experimentally investigates two common imaging approaches: DW synthetic aperture focusing (DW-SAF) and DW synthetic focusing (DW-SF). A beam-pattern model was …

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Sub-pitch plane-wave imaging for improved 3-D ultrasound imaging with a large pitch 2-D array

Doyoung Jang, Jaesok Yu, Heechul Yoon

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Analysis of LEO Satellite Detection Errors Considering Atmospheric Environment

Jongho Keun, Doyoung Jang, Hosung Choo

This paper proposes a ray-tracing method to estimate a propagation path between a ground station and low-Earth-orbit (LEO) satellites. To accurately predict a propagation path and detection error, the proposed ray-tracing method adopts an atmospheric refractivity model that includes not only the …

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Dual-Band Shared Aperture Antennas and Metasurface Antenna for Ship Mast Integration

Changhyun Lee, Sungsik Wang, Doyoung Jang, Hyun Kim et autres

Antennas mounted on masts located at high positions on ships require lightweight design to ensure the stability of the ship. One way to reduce the weight of the mast-mounted antennas is to design array antennas that operate in multiple frequency bands to …

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Highly Durable Design of an S/X Dual-Band Shared Aperture Array Antenna

En-yeal Yim, Doyoung Jang, Hosung Choo, Jun-Yong Lee

In this study, we proposed an S/X-band shared aperture array antenna with a highly durable design that considers the harsh maritime environment. The proposed antenna had a shared aperture configuration in which the S-band element layers were stacked on top of the …

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Prediction of Atmospheric Refractivity From Clutter Power Images Using a Convolutional Neural Network and a Trilinear Atmospheric Model

Taekyeong Jin, Doyoung Jang, Hosung Choo

In this paper, we propose a method for predicting atmospheric conditions from clutter power images using a convolutional neural network (CNN). The proposed refractivity from clutter (RFC) method employs a CNN model that utilizes clutter power images as input. These input data, …

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Real-Time Duct Prediction and Propagation Analysis Using Genetic Algorithm-Based RFC and Parabolic Equation Method

Doyoung Jang, Hosung Choo, Dong-Yeop Na, Yong Bae Park

This paper proposes a real-time prediction of the duct using a refractivity from clutter (RFC) method based on genetic algorithm (GA) and the parabolic equation (PE) method. Three dates with duct formation are selected, and the refractivity calculated using atmospheric measurements is …

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Analysis of Seasonal and Regional Duct Tendencies Based on Domestic High-Altitude Meteorological Measurement Data

Changhyeon Im, Doyoung Jang, Nammoon Kim, Hosung Choo

In this study, we analyzed the seasonal and regional duct tendencies using domestic high-altitude atmospheric measurement data. The meteorological data was collected from seven high-altitude meteorological observatories in South Korea (Baengnyeong Island, Heuksan Island, Jeju Island, Osan, Gwangju, Bukgangneung, and Pohang) over …