Telecom Pub Date : 2024-04-08 DOI: 10.3390/telecom5020016

Sahar Saleh, Tale Saeidi, Nick Timmons

{"title":"Simple Compact UWB Vivaldi Antenna Arrays for Breast Cancer Detection","authors":"Sahar Saleh, Tale Saeidi, Nick Timmons","doi":"10.3390/telecom5020016","DOIUrl":"https://doi.org/10.3390/telecom5020016","url":null,"abstract":"In this study, at ultra-wideband (UWB) frequency band (3.1–10.6 GHz), we propose the use of compact 2:1 and 3:1 nonuniform transmission line Wilkinson power dividers (NTL WPDs) as feeding networks for simple 2 × 1 linear UWB Vivaldi tapered and nonuniform slot antenna (VTSA and VNSA) arrays. The 2:1 and 3:1 tapered transmission line (TTL) WPDs are designed and tested in this work as benchmarks for NTL WPDs. The VTSA array provides measured S11 < −10.28 dB at 2.42–11.52 GHz, with a maximum gain of 8.61 dBi, which is 24.39% higher than the single element. Using the VNSA array, we achieve 52% compactness and 6.76% bandwidth enhancement, with good measured results of S11 < −10.2 dB at 3.24–13 GHz and 15.11% improved gain (8.14 dBi) compared to the VNSA single element. The findings show that the NTL and Vivaldi nonuniform slot profile antenna (VNSPA) theories are successful at reducing the size of the UWB WPD and VTSA without sacrificing performance. They also emphasize the Vivaldi antenna’s compatibility with other circuits. These compact arrays are ideal for high-resolution medical applications like breast cancer detection (BCD) because of their high gain, wide bandwidth, directive stable radiation patterns, and low specific absorption rate (SAR). A simple BCD simulation scenario is addressed in this work. Detailed parametric studies are performed on the two arrays for impedance-matching enhancement. The computer simulation technology (CST) software is used for the simulation. Hardware measurement results prove the validity of the proposed arrays.","PeriodicalId":509646,"journal":{"name":"Telecom","volume":"39 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140728184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dual Data Streaming on Tropospheric Communication Links Based on the Determination of Beam Pointing Dynamics Using a Modified Ray-Based Channel Model 对流层通信链路上的双数据流，基于使用修改后的基于射线的信道模型确定波束指向动力学

Telecom Pub Date : 2024-02-16 DOI: 10.3390/telecom5010009

Amit Garg, Ranjan Mishra, Ashok Kumar Kalra, Ankush Kapoor

{"title":"Dual Data Streaming on Tropospheric Communication Links Based on the Determination of Beam Pointing Dynamics Using a Modified Ray-Based Channel Model","authors":"Amit Garg, Ranjan Mishra, Ashok Kumar Kalra, Ankush Kapoor","doi":"10.3390/telecom5010009","DOIUrl":"https://doi.org/10.3390/telecom5010009","url":null,"abstract":"Tropospheric systems are widely used by military forces as they provide long-distance, real-time communication. Slow-fading propagation loss reduces link availability and limits its data-carrying capacity. Beam pointing dynamics provides knowledge of favorable heights at different times of the day in different seasons and a useful steering range. Beam steering, based on the beam pointing dynamics of the link, can overcome slow fading. The main contributions of this paper are the derivation of a realistic and accurate tropospheric channel model obtained by making important modifications to Dinc’s ray-based model. This paper also presents a method for determining beam pointing dynamics using the modified model. Beam pointing dynamics for two different links located in India have been determined in this paper using real-world data obtained from the Indian Meteorological Department. Another significant contribution of the paper is presenting the prospect of dual data streaming on tropospheric links using a fixed beam and a dynamically steered beam, based on the examination of beam pointing dynamics obtained for the two links. The main result presented in this paper is the comparison of powers received from the most favorable heights in a steerable beam system with the powers received in conventional fixed-beam systems for different days of the year. It has been shown that a higher received power can be achieved with beam steering. Another important result shown is the comparison of the achievable data rates for a single fixed-beam system and a dual-beam (one fixed beam and one dynamically steered beam) system. It has been shown that almost double the data rate is achievable in a dual-beam system. The method for the determination of beam pointing dynamics and the possibility of dual data streaming presented in this paper can significantly enhance the availability and capacity of tropospheric links.","PeriodicalId":509646,"journal":{"name":"Telecom","volume":"42 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139960474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

5G Physical Layer-Based Procedure to Support Time-Sensitive Networking 基于 5G 物理层的程序支持时间敏感型网络

Telecom Pub Date : 2024-01-24 DOI: 10.3390/telecom5010004

Faiza Bouchmal, Oscar Carrasco, Yang Fu, Jaime Rodrigo, J. Monserrat, Narcís Cardona

引用次数: 0

Correction: Tsakalidis et al. Design and Implementation of a Versatile OpenHAB IoT Testbed with a Variety of Wireless Interfaces and Sensors. Telecom 2023, 4, 597–610 更正：Tsakalidis等人.带有多种无线接口和传感器的多功能OpenHAB物联网测试平台的设计与实现.电信 2023，4，597-610

Telecom Pub Date : 2024-01-19 DOI: 10.3390/telecom5010003

S. Tsakalidis, G. Tsoulos, Dimitrios E. Kontaxis, Georgia Athanasiadou

引用次数: 0

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