Journal of electromagnetic engineering and science最新文献_第5页

Estimation of Electromagnetic Field Penetration into Concrete Buildings Using a Theoretical Approach Considering External Environmental Factors 用考虑外部环境因素的理论方法估算电磁场对混凝土建筑的穿透力

IF 2.3 3区工程技术

Journal of electromagnetic engineering and science Pub Date : 2023-05-31 DOI: 10.26866/jees.2023.3.r.161

Han-Hee Lee, Jung-Hwan Lim, J. W. Lee, J. Kwon, Junghwan Hwang, Changhee Hyoung, Hyunho Park

{"title":"Estimation of Electromagnetic Field Penetration into Concrete Buildings Using a Theoretical Approach Considering External Environmental Factors","authors":"Han-Hee Lee, Jung-Hwan Lim, J. W. Lee, J. Kwon, Junghwan Hwang, Changhee Hyoung, Hyunho Park","doi":"10.26866/jees.2023.3.r.161","DOIUrl":"https://doi.org/10.26866/jees.2023.3.r.161","url":null,"abstract":"In this paper, we propose a theoretical approach to estimate the power level of electromagnetic waves radiated into a structure by a specific external source. The target structure is a multistory building on a university campus that is used primarily for academic purposes and is much larger than the target wavelength. To verify the accuracy and efficiency of the proposed theoretical approach, measurements were carried out and a commercially available simulation tool, Wireless Insite, was adopted. We then analyzed the influence of an area of vegetation as an external environmental factor that could affect the radiated electromagnetic waves because of its location in front of the target structure. For this, a precise simulation environment was designed to derive the quantitative values of the electromagnetic attenuation caused by the external environmental factor. Furthermore, those values were applied to the theoretical approach. The results of the theoretical approach accounting for the external environmental factor were similar to those of the actual measured results. The results were also similar to those of the simulation tool, Wireless Insite, but the theoretical approach provided more efficient analysis results in terms of time consumption and computer resources.","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42036846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-Isolation 5G Repeater Antenna Using a Novel DGS and an EBG 采用新型DGS和EBG的高隔离5G中继器天线

IF 2.3 3区工程技术

Journal of electromagnetic engineering and science Pub Date : 2023-05-31 DOI: 10.26866/jees.2023.3.r.168

Myeong-Jun Kang, SeungYong Park, Kab-Goo Cho, Kyung‐Young Jung

引用次数: 0

A Modeling and Design Methodology of Double Exponential Pulse Generator for Simulation-Based Conducted Disturbance Immunity Testing 基于仿真的传导抗扰测试双指数脉冲发生器建模与设计方法

IF 2.3 3区工程技术

Journal of electromagnetic engineering and science Pub Date : 2023-05-31 DOI: 10.26866/jees.2023.3.r.167

Jaesik Moon, J. Kwon, Eakhwan Song

{"title":"A Modeling and Design Methodology of Double Exponential Pulse Generator for Simulation-Based Conducted Disturbance Immunity Testing","authors":"Jaesik Moon, J. Kwon, Eakhwan Song","doi":"10.26866/jees.2023.3.r.167","DOIUrl":"https://doi.org/10.26866/jees.2023.3.r.167","url":null,"abstract":"In this paper, an equivalent circuit model of a double-exponential pulse generator is proposed for use as a time-domain noise source in high-altitude electromagnetic pulse (HEMP) conducted disturbance immunity testing. The analytic relationship between the proposed equivalent circuit model and the source pulse requirements expressed by the test standards is derived. Based on this relationship, a design methodology for the equivalent circuit model is proposed to extract the circuit components that satisfy the source pulse requirements, particularly in the form of source impedance and pulse waveform requirements. The proposed design methodology is applied to design an equivalent circuit model of the double exponential pulse generator with various test modes in the conducted disturbance immunity test. The designed double exponential pulse generator is applied to a simulation-based conductive disturbance immunity testing platform based on the International Electrotechnical Commission (IEC) 61000-4-24 standard to validate the effectiveness of the proposed equivalent circuit model and design methodology.","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41755589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dual-Band Antenna with OAM Mode Radiated by Ground Plane 地平面辐射OAM模式双频天线

IF 2.3 3区工程技术

Journal of electromagnetic engineering and science Pub Date : 2023-05-31 DOI: 10.26866/jees.2023.3.r.164

Yuheng Li, Guang Yang, Weiwen Li, Qing Huo Liu

引用次数: 1

Analysis Method for Determining Optimal Synthetic Aperture Time Using Estimated Range and Doppler Cone Angle at the Center of Synthetic Aperture Length 利用估计距离和合成孔径长度中心的多普勒锥角确定最佳合成孔径时间的分析方法

IF 2.3 3区工程技术

Journal of electromagnetic engineering and science Pub Date : 2023-05-31 DOI: 10.26866/jees.2023.3.r.160

Min-Ji Kim, Sangho Lim, Dong-Cho Shin

引用次数: 0

Multiparametric Design of an All-Metal, Broadband, Slant Dual-Polarized Vivaldi Array Antenna 全金属宽带倾斜双极化维瓦尔第阵列天线的多参数设计

IF 2.3 3区工程技术

Journal of electromagnetic engineering and science Pub Date : 2023-05-31 DOI: 10.26866/jees.2023.3.r.162

Cheolsoo Lee, Joo-Rae Park

引用次数: 0

Design of a Load Modulated Balanced Amplifier with a Two-Stage Control Power Amplifier 具有两级控制功率放大器的负载调制平衡放大器的设计

IF 2.3 3区工程技术

Journal of electromagnetic engineering and science Pub Date : 2023-05-31 DOI: 10.26866/jees.2023.3.r.170

Sagini E. Mochumbe, Youngoo Yang

{"title":"Design of a Load Modulated Balanced Amplifier with a Two-Stage Control Power Amplifier","authors":"Sagini E. Mochumbe, Youngoo Yang","doi":"10.26866/jees.2023.3.r.170","DOIUrl":"https://doi.org/10.26866/jees.2023.3.r.170","url":null,"abstract":"While an ideal Doherty power amplifier has a linear response, the load modulated balanced amplifier (LMBA) has a compressive response under ideal conditions. This inherent nonlinear characteristic is due to the lower power contribution of the single auxiliary device as the balanced amplifier transistors approach compression. This article presents an LMBA with a two-stage control signal amplifier in place of the single auxiliary device. The idea is to preserve a high and constant gain across the high- and low-power regions by tuning the two-stage gain control signal to match the balanced amplifier gain. An optimal load trajectory can be found for a high-efficiency design by appropriately terminating the second harmonic while ensuring an optimal impedance match in all devices. At the same time, by setting an optimal output power from the auxiliary device, sufficient power is provided to linearize the response of the main power amplifier beyond the output back-off power boundary. As proof of concept, a prototype is designed and implemented. The experimental measurements demonstrate a drain efficiency of 59%–64% at maximum output power and 46%–52% at 7.5 dB output back-off power over the target frequency range of 3.3–3.8 GHz.","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47693905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Design of a Sliding Rectangular Waveguide Array Antenna for Beam Steering 一种用于波束导向的滑动矩形波导阵列天线设计

IF 2.3 3区工程技术

Journal of electromagnetic engineering and science Pub Date : 2023-05-31 DOI: 10.26866/jees.2023.3.r.166

Yoon-Seon Choi, Dong‐Su Choi, In-Hee Han, J. Woo

{"title":"The Design of a Sliding Rectangular Waveguide Array Antenna for Beam Steering","authors":"Yoon-Seon Choi, Dong‐Su Choi, In-Hee Han, J. Woo","doi":"10.26866/jees.2023.3.r.166","DOIUrl":"https://doi.org/10.26866/jees.2023.3.r.166","url":null,"abstract":"In this paper, we designed a sliding waveguide array antenna that can be beam-steered via mechanical manipulation. This reduces the vulnerability of electronic beam-steering radars mounted on ships or aircraft to electromagnetic pulse (EMP) attacks. The design frequency was 9.375 GHz. First, the proposed antenna was designed to adjust the phase difference between the arrayed waveguide antennas by changing the length of the rectangular waveguide using a slide. Subsequently, a ridge structure with optimized curvature was attached to the aperture of the rectangular waveguide to obtain stable reflection coefficient characteristics. Finally, eight rectangular waveguide antennas and two dummy antennas were E-plane arrayed at intervals of 0.8λ (25.6 mm) to obtain a beam width of nearly 8°. A beam width of 8° was then obtained by adjusting the length of each waveguide. It was possible to orient the beam of the antenna in intervals of 8° using the phase difference of each antenna. The proposed mechanical beam steering technique can replace electronic beam steering for radar antennas, rendering the structures less vulnerable to EMP attacks.","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41503829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of Compact Parallel-Connected Chained Function Filters 紧凑型并联链式函数滤波器的设计

IF 2.3 3区工程技术

Journal of electromagnetic engineering and science Pub Date : 2023-05-31 DOI: 10.26866/jees.2023.3.r.169

F. E. Chinda, Socheatra Seoung, S. Cheab, M. S. Yahya, H. F. Hawari

{"title":"Design of Compact Parallel-Connected Chained Function Filters","authors":"F. E. Chinda, Socheatra Seoung, S. Cheab, M. S. Yahya, H. F. Hawari","doi":"10.26866/jees.2023.3.r.169","DOIUrl":"https://doi.org/10.26866/jees.2023.3.r.169","url":null,"abstract":"The design of compact parallel-connected chained function filters is presented in this paper. The proposed filters will offer reduced sensitivity to manufacturing tolerance within the specified bandwidth in comparison to conventional Chebyshev filters for C-band applications. A new filtering function according to a chained configuration is derived for fourth-order filters, and the synthesis procedures are presented. To demonstrate the feasibility of this approach, the circuit simulation based on parallel-connected topology is performed in an advanced design system, while the design and simulation of a fourth-order filter in dielectric technology are carried out in high-frequency simulation software. The prototype of fourth-order microstrip topology is fabricated using open-loop resonators. The overall circuit size of the filter is 2.5 cm × 4 cm. The achieved simulation and measured insertion/return loss are 0.409 dB/20 dB and 2.674 dB/18.074 dB, respectively. Extensive sensitivity analysis is conducted to prove the fabrication tolerance of the filter. The reduced sensitivity of the proposed filter to manufacturing tolerance is fully demonstrated using an open-loop microstrip technology, and its reliability is proven by theoretical analysis. The prototype results in this research are validated and agree with the theoretical results. In terms of implementation, this design technique will be a very useful mathematical tool for any filter design engineer.","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46436626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experiments of Sub-THz Wave Folded Waveguide Traveling-Wave Tube Amplifier 亚太赫兹波折叠波导行波管放大器实验

IF 2.3 3区工程技术

Journal of electromagnetic engineering and science Pub Date : 2023-03-31 DOI: 10.26866/jees.2023.2.r.160

K. Jang, Jong-Hyun Kim, G. Kim, Jung-Il Kim, Jin‐Joo Choi

{"title":"Experiments of Sub-THz Wave Folded Waveguide Traveling-Wave Tube Amplifier","authors":"K. Jang, Jong-Hyun Kim, G. Kim, Jung-Il Kim, Jin‐Joo Choi","doi":"10.26866/jees.2023.2.r.160","DOIUrl":"https://doi.org/10.26866/jees.2023.2.r.160","url":null,"abstract":"This study showed the possibility of using a sub-terahertz (THz) traveling-wave tube (TWT) via measuring the transmission characteristics and TWT performance of the circuit by applying X-ray LIGA, a micro-fabrication process, to the interaction circuit. The applied circuit type, an E-bend folded waveguide, is a simple structure most suitable for lithography. A total of three applied frequencies were used the W-band, G-band, and 850 GHz. Among the manufactured circuits, the W-band circuit was applied to the TWT, one of the vacuum electronics devices (VEDs). This was done to prove the manufacturing accuracy of the circuit by comparing the nonlinear characteristics of the circuit with the prediction results. Through such testing, the small signal gain was measured as 13 ± 2 dB under the conditions of 13.96-kV and 24.2-mA electron beam energy. The frequency bandwidth was extremely wide, about 9 GHz, and showed similar characteristics to the simulation predictions. The maximum output of the device was obtained up to 1 W or more at 87.12 GHz by slightly increasing the beam current. These characteristic achievements showed the suitability of the TWT for very small circuits fabricated using the X-ray LIGA process, further suggesting the applicability of other sub-THz bands.","PeriodicalId":15662,"journal":{"name":"Journal of electromagnetic engineering and science","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43063185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0