 Subjects -> ELECTRONICS (Total: 207 journals)
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- Histelcon 2023
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Pages: C2 - C2
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- ICEAA International Conference on Electromagnetics in Advanced
Applications IEEE APWC IEEE-APS Topical Conference on Antennas and
Propagation in Wireless Communications-
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Pages: C3 - C3
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- IEEE AP-S Volunteers in the Spotlight! [Editor’s Comments]
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Authors:
Francesco Andriulli;
Pages: 4 - 6
Abstract: Many of us as members of IEEE AP-S have the opportunity to benefit from the many activities, benefits, sponsorships, and conferences that AP-S has to offer every year. We owe all of this to the many volunteers in our society that support IEEE AP-S with their enthusiasm and commitment at the local, regional, national, and international levels. A central role of this dynamism is the mutual visibility of the different scales, with local activities that are publicized and honored worldwide and international initiatives that are disseminated locally to make sure that everybody knows the great opportunities that our IEEE Society has to offer. The magazine has traditionally served with enthusiasm this dynamic, and we will keep doing so even further with a brand new column that starts in this issue, “AP-S Committees & Activities.” The column’s mission is to present in one place all the upcoming and vibrant initiatives sprouting from our volunteers locally and globally. This will include AdCom activities, AP-S committees’ work and reports, local Chapter news, conference outcomes and reports, and every other relevant initiative from all of those that animate so enthusiastically our Society! I hope you will enjoy this new column, and if you have not done so already, consider volunteering for IEEE AP-S!
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- TechRxiv: Share Your Preprint Research With the World!
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Pages: 6 - 6
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- The Transmon Qubit for Electromagnetics Engineers: An introduction
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Authors:
Thomas E. Roth;Ruichao Ma;Weng C. Chew;
Pages: 8 - 20
Abstract: One of the most popular approaches being pursued to achieve a quantum advantage with practical hardware is the use of superconducting circuit devices. Although significant progress has been made over the previous two decades, substantial engineering efforts are required to scale these devices so they can be used to solve many problems of interest. Unfortunately, much of this exciting field is described using technical jargon and concepts from physics that are unfamiliar to a classically trained electromagnetics engineer. As a result, this work is often difficult for engineers to become engaged in.
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- On the Reflectivity of Materials for Radio Telescope and Space Antenna
Applications: Antenna reflector loss needs to be known for many specific
antenna applications-
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Authors:
Cornelis G.M. van ’t Klooster;Vladimir V. Parshin;Evgeni A. Serov;A.B. Smolders;
Pages: 21 - 33
Abstract: System requirements can dictate the use of antenna reflector materials that are not electrically optimum and clearly not “perfectly electrically conducting.” This makes loss measurements necessary. A loss that is not acceptable for one application might be acceptable for another application. Instrument or radiometer antennas require a low loss, but, sometimes, this could be less critical for telecommunication antennas. We investigated less conventional materials, including a nickel-based material, for a radio telescope antenna (Atacama Large Millimeter/submillimeter Array [ALMA]) and other materials as needed in certain space antenna applications. A sensitive open resonator was used. The data collected provide an understanding of and insight into the loss properties for the respective applications. This has led to useful models confirmed by the data.
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- Scalable Undersized Dataset RF Classification: Using convolutional
multistage training-
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Authors:
Khalid Youssef;Greg Schuette;Yubin Cai;Daisong Zhang;Yikun Huang;Yahya Rahmat-Samii;Louis-S. Bouchard;
Pages: 34 - 47
Abstract: Unlike areas such as computer vision and speech recognition, where convolutional and recurrent neural network (NN)-based approaches have proven effective due to the nature of the respective areas of application, deep learning (DL) still lacks a general approach suitable for the unique nature and challenges of radiofrequency (RF) systems such as radar, signals intelligence, electronic warfare, and communications. Existing approaches face problems in robustness, consistency, efficiency, repeatability, and scalability. Some of the main challenges in radiofrequency (RF) sensing such as radar target identification are the difficulty and cost of obtaining data. Hundreds to thousands of samples per class are typically used when training for classifying signals into 2–12 classes with reported accuracy ranging from 87% to 99%, where accuracy generally decreases with more classes added. In this article, we present a new DL approach based on multistage training (MST) and demonstrate it on RF sensing signal classification. We consistently achieve more than 99% accuracy for up to 17 diverse classes using only 11 samples per class for training, a substantial improvement over standard DL approaches.
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- Manufacturing Guidelines for W-Band Full-Metal Waveguide Devices:
Selecting the most appropriate technology-
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Authors:
Pablo Sanchez-Olivares;Marta Ferreras;Eduardo Garcia-Marin;Lucas Polo-López;Adrián Tamayo-Domínguez;Juan Córcoles;José Manuel Fernández-González;José Luis Masa-Campos;José R. Montejo-Garai;Jesús M. Rebollar-Machain;Jorge A. Ruiz-Cruz;Manuel Sierra-Castañer;Manuel Sierra-Pérez;Mariano Barba;José Luis Besada;Jesús Grajal;
Pages: 48 - 62
Abstract: This article analyzes some of the key aspects of manufacturing techniques for passive components and antennas in the millimeter band, with emphasis on the W band. Even experienced microwave designers might face great technological challenges when upscaling their designs to higher-frequency bands. Thus, several manufacturing technologies are widely analyzed in this work by designing, manufacturing, and measuring different components in the W band. Subtractive manufacturing techniques, such as computer numerical control (CNC) milling and electrical discharge machining (EDM), as well as additive manufacturing techniques, including stereolithography (SLA), direct metal laser sintering (DMLS), and diffusion bonding (DB) are explored. The advantages and disadvantages of these technologies are evaluated using features such as manufacturing tolerances, accuracy, surface roughness, and cost. The purpose is to offer some guidelines for the selection of the most appropriate manufacturing technology in the W band, bearing in mind both the performance of the different manufacturing methods and the particular circuital topologies of the component under development.
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- Endfire Circularly Polarized Planar Antennas: A review of their
development-
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Authors:
Yifan Yin;Ke Wu;
Pages: 63 - 75
Abstract: This article reviews and summarizes the developments of endfire circularly polarized (CP) planar antennas. The difficulty in designing such antennas is that there is not a large radiating aperture on a substrate to produce strong enough vertically polarized (VP) radiation to match the horizontally polarized (HP) radiation. Mainly based on the structures of radiation and feeding, endfire CP planar antennas are classified into several groups. The mechanisms of these antennas are identified, their performance is compared with tables, and the relation between performance and structures is explored. It is indicated that the distance between the phase centers of VP and HP radiators is a crucial parameter to affect the axial ratio (AR) bandwidth and beamwidth of an endfire CP antenna. It is addressed that it is essential to have strong VP radiation for a high-gain and wideband endfire CP antenna when substrates are thin.
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- On De-Pointing Effects Caused by Snow Accumulation on Radomes for Ground
Stations Working at K-Band: An analysis of the SNOWBEAR project-
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Authors:
Matteo Marchetti;Davide Arenare;Filippo Concaro;Marco Pasian;
Pages: 76 - 91
Abstract: Ground stations working at high frequencies, such as the K-band, installed at polar latitudes and protected by radomes, are increasingly used to support modern satellites. The effect that snow accumulation may have on the radome is consequently important, as at these frequencies it may jeopardize the satellite link. This article analyses an operative case, referred to as SNOWBEAR (Svalbard grouND StatiOn for Wide Band Earth observation dAta Reception), where a 6.4-m antenna has been installed at Svalbard, Norway, to track an Earth observation (EO) satellite, NOAA-20, for a period of two years. We demonstrate, using experimental data and numerical models, that a chief effect can be described in terms of de-pointing of the main beam, with a particular focus on the difference of de-pointing between the sum and delta modes, and that a real-time, effective, solution is not yet available.
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- Sources of Cross-Polarized Radiation in Microstrip Patches:
Multiparametric identification and insights for advanced engineering-
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Authors:
Sk Rafidul;Debatosh Guha;Chandrakanta Kumar;
Pages: 92 - 103
Abstract: This article revisits the reasons behind the cross-polarized (XP) radiation in microstrip patches and focuses on alleviating a long-standing deficiency in terms of a comprehensive knowledge about the same. This study has a twofold objective. First, it explores all possible components of the surface fields as the correlating factors over all of the radiation planes, especially across the diagonal or skewed axes. An extensive study involving varied patch geometries along with different feed networks has been executed. The resulting huge volume of data has been analyzed to identify the ideal surface field requirements for the best possible XP performance.
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- The Curious Case of Effective Isotropic Sensitivity: Polarization mismatch
in over-the-air testing of wireless user equipment-
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Authors:
Amirreza Khajehnasiri;
Pages: 104 - 116
Abstract: This article provides the theory behind the two-step over-the-air (OTA) test method widely used in 3rd Generation Partnership Project (3GPP) test specifications and, in particular, the testing and characterization of 5G millimeter-wave user equipment (UE) in compact antenna test ranges (CATRs). Special attention is paid to receiver (Rx) characteristics and the polarization mismatch problem, which is encountered in spherical coverage tests. The received power of a UE with a dual-polarized antenna system is derived, and the output signal-to-noise ratio (SNR) is calculated using the maximal ratio combining (MRC) principle. And finally, flaws in the dominant interpretation of this test method in the development of 5G millimeter-wave standards and their consequences are addressed.
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- Meetings and Symposia [Meetings and Symposia]
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Authors:
Raymond P. Wasky;
Pages: 118 - 119
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- IEEE App
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Pages: 119 - 119
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- Short Courses [Courses]
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Authors:
Raymond P. Wasky;
Pages: 120 - 129
Abstract: Presents information on short courses recommended by the APS society.
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- First Encounter' [Turnstile]
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Authors:
Rajeev Bansal;
Pages: 121 - 121
Abstract: I received the book Penguins, Pineapples and Pangolins [1] as a Christmas gift in 2022. It is a fascinating compendium of the first encounters European travelers had during the Age of Exploration (the 15th to 17th century) with people, flora, and fauna in distant lands, all narrated in the explorers’ own voices. As the author, Claire Cock-Starkey, notes in the prologue [1]:
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- Up Close and Personal [Women in Engineering]
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Authors:
Konstantina S. Nikita;Zoya Popović;
Pages: 122 - 135
Abstract: We would like to give the stage to some outstanding women in our field. So, we asked our colleagues questions that are gender-independent, hoping everyone can learn something useful from their answers, or at least be entertained.
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- AP-S Young Professional Ambassador Program Update [Young Professionals]
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Authors:
Qammer H. Abbasi;
Pages: 126 - 129
Abstract: In 2021, the IEEE Antennas and Propagation Society (AP-S) Young Professional (YP) Committee started a new initiative, the AP-S YP Ambassador Program, which is now in its second year. The objective of this program is to inspire and inform AP-S YPs on a variety of topics both technical and nontechnical to enhance their interest and engagement in the field of antennas and propagation by delivering talks at various Chapters/Sections “on-demand” virtually in addition to getting involved in various AP-S YP activities.
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- The History of Wireless Telegraphy at the Eiffel Tower [Historically
Speaking]-
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Authors:
Ted Simpson;Bill Liles;Trevor S. Bird;
Pages: 130 - 135
Abstract: Long after Gustave Eiffel’s famous tower had been built to celebrate the first century of the Republic, many Parisians were still offended by this tour de fer and sought its removal. Eiffel argued against this, saying that the unique advantages the tower’s elevation offered for scientific research justified its permanence; the height was particularly important for the transmission of the newly discovered Hertzian waves carrying telegraphic signals sans fil (without wires). But it was still the age of machines. Steam power and electric lights were common. Vacuum tubes were yet to come. Here we review an array of devices used to generate and detect these invisible waves. With this new mode of communication, ships at sea were no longer bereft of news from distant ports or other ships; the French military posts on distant shores were kept in constant contact. Time signals from the Paris Observatory could be shared with anyone possessing a simple antenna and crystal receiver. Here we look back at the rapidly developing state of the art in antennas and transmitters and the people involved in this exciting era. We summarize the early stages of wireless technology from a French perspective.
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- Reports From Chapter Activity, COPE, Distinguished Lecturers, and Young
Professionals Committees [AP-S Committees & Activities]-
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Authors:
Meisong Tong;Anisha Apte;Chinmoy Saha;Kwai Man Luk;CJ Reddy;
Pages: 136 - 142
Abstract: Provides society information that may include news, reviews or technical notes that should be of interest to practitioners and researchers.
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- Hidden Word [Hidden Word]
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Authors:
Fred E. Gardiol;
Pages: 143 - 143
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
- Society Officers & Administrative Committee
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Pages: 144 - 144
PubDate:
April 2023
Issue No: Vol. 65, No. 2 (2023)
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