Letteratura scientifica selezionata sul tema "Antennal bole"
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Articoli di riviste sul tema "Antennal bole"
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binti Harun, Siti Fatimah, Mohd Fais bin Mansor e Norbahiah binti Misran. "Reconfigurable Reflectarray Antenna: Background, Classification and Configurable Mechanisms". Jurnal Kejuruteraan 35, n. 5 (30 settembre 2023): 1249–64. http://dx.doi.org/10.17576/jkukm-2023-35(5)-24.
Testo completoAbstract (sommario):
Reflectarray antennas have emerged as one of the most suitable choice for 5G network base station antennas due to their ability to combine the advantages of parabolic reflectors and phased array antennas. These antennas offer a lightweight structure, high gain, and low impedance mismatch losses. High gain and low loss are crucial factors in ensuring the antenna delivers low latency and high-quality 5G radio signals. The application of 5G technology becomes more practical and efficient with the capability to adjust the functionality of a single 5G antenna or enable reconfiguration. This reconfigurable technique simplifies the multi-antenna systems and significantly reduces costs, making it more practical and systematic. Furthermore, this reconfigurability is particularly beneficial for satellite applications, as it allows for the reconfiguration of the signal in the event of satellite movement on the space. This paper aims to discuss the historical development of reconfigurable reflectarray antennas, focusing on the innovations in each configurable mechanism. The paper further explores the classification of configurations employed by this antenna, encompassing frequency configuration, radiation pattern, polarization, and hybrid configurations that integrate multiple existing configuration classifications. Finally, the research paper provides a discussion of the most recent research and innovations in the configurable mechanisms of reflectarray antennas.
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Mohamad, Sarah Yasmin, Ahmad Alhadi Ruslan, Khairayu Badron, Ahmad Fadzil Ismail, Norun Farihah Abdul Malek e Farah Nadia Mohd Isa. "STUDY OF MICROSTRIP PATCH ARRAY ANTENNA FOR SIDE LOBE SUPPRESSION IN THE X-BAND REGION USING UNIFORM, BINOMIAL AND TSCHEBYSCHEFF EXCITATION METHODS". IIUM Engineering Journal 21, n. 1 (20 gennaio 2020): 61–72. http://dx.doi.org/10.31436/iiumej.v21i1.1221.
Testo completoAbstract (sommario):
In this paper, a microstrip patch array antenna is designed and simulated to operate in the X-band frequency region at 9.5 GHz. For X-band communication transmission, it is necessary to suppress the side lobe radiation pattern of the antenna as much as possible to avoid the transmission being intercepted and/or received by undesirable neighbouring satellites. The geometrical design of the microstrip patch array antenna is simulated and executed using CST Microwave Studio (CST MWS) in order to study the effects of various antenna parameters such as S11, gain, directivity, side lobe level, and angular width. It is shown that the proposed antenna exhibits a low side lobe level of -14.2 dB with an acceptable high gain and directivity of 16.5 dB and 17.7 dB, respectively. The antenna configuration also has a size of only 285 mm × 59.275 mm which is much more compact and lightweight compared to the standard reflector antennas that are used for most X-band communication transmission.
ABSTRAK: Kajian ini berkaitan antena cantuman barisan jalurmikro yang direka dan disimulasi beroperasi pada 9.5 GHz frekunsi daerah jalur-X. Pada transmisi komunikasi jalur-X, corak radiasi sisi-lobus antena perlu ditahan sebanyak mungkin bagi mengelak transmisi dipintas dan/atau diterima oleh satelit tetangga yang tidak di ingini. Rekaan geometri antena cantuman barisan jalurmikro disimulasi dan diuji menggunakan perisian CST Studio Gelombang Mikro (CST MWS) bagi mengkaji pelbagai kesan parameter antenna seperti S11, gandaan, keterarahan, tahap sisi-lobus dan lebar sudut. Didapati bahawa antena yang dicadangkan mempunyai tahap sisi-lobus -14.2 dB yang rendah dengan gandaan tinggi yang boleh diterima dan keterarahan sebanyak 16.5 dB dan 17.7 dB, masing-masing. Tatabentuk antena mempunyai saiz 285 mm × 59.275 mm yang kompak dan ringan berbanding antena pemantul piawai, di mana telah digunakan pada kebanyakan jalur-X transmisi komunikasi.
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Bonenberger, Christopher M. A., e Klaus W. Kark. "A Broadband Impedance-Matching Method for Microstrip Patch Antennas Based on the Bode-Fano Theory". Frequenz 72, n. 7-8 (26 giugno 2018): 373–80. http://dx.doi.org/10.1515/freq-2018-0037.
Testo completoAbstract (sommario):
Abstract Considering the narrow bandwidth of microstrip antennas, but also their applicability in upcoming technologies, this paper addresses the problem of wide-band matching, the theoretical bounds on the matching bandwidth and low-cost and low-complexity matching strategies. In this context the Bode-Fano bounds of single mode, linearly polarized aperture-coupled microstrip antennas is evaluated, optimized and compared to the theoretical bounds on matching bandwidth of other common feeding technologies. A detailed study of the input impedance of aperture-coupled patch antennas shows how to widen the Fano bounds. Based on this, a straight-forward and effective method to optimize the Fano bound is given. After optimization of the antennas input impedance, basic matching techniques can be applied, to exploit the enlarged bandwidth potential. As an example a $\lambda/4$-transformer as matching element is proposed. Design equations and simulation and measurement results of X-band prototypes are given as verification.
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Jagodzińska, Katarzyna, Stanisław Dziura e Maciej Walkowiak. "Active Impedance Matching". Solid State Phenomena 210 (ottobre 2013): 3–8. http://dx.doi.org/10.4028/www.scientific.net/ssp.210.3.
Testo completoAbstract (sommario):
Electrically small antenna suffer from the high Q impedance such as narrow bandwidth and poor gain. To improve them, passive impedance matching is often used but it is restricted to a Bode-Fano limit. To skip it, active matching incorporating non-Foster circuits can provide a good solution. Using non-Foster theory, in this paper an active reactance circuit (ARC) design is proposed for application to electrically small antenna prototypes.
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Haase, Albrecht, Elisa Rigosi, Federica Trona, Gianfranco Anfora, Giorgio Vallortigara, Renzo Antolini e Claudio Vinegoni. "In-vivo two-photon imaging of the honey bee antennal lobe". Biomedical Optics Express 2, n. 1 (16 dicembre 2010): 131. http://dx.doi.org/10.1364/boe.2.000131.
Testo completo
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Soltani, Navid, Elham Rabbany Esfahany, Sergey I. Druzhinin, Gregor Schulte, Julian Müller, Benjamin Butz, Holger Schönherr, Mario Agio e Nemanja Markešević. "Biosensing with a scanning planar Yagi-Uda antenna". Biomedical Optics Express 13, n. 2 (3 gennaio 2022): 539. http://dx.doi.org/10.1364/boe.445402.
Testo completo
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Berrier, Audrey, Martijn C. Schaafsma, Guillaume Nonglaton, Jonas Bergquist e Jaime Gómez Rivas. "Selective detection of bacterial layers with terahertz plasmonic antennas". Biomedical Optics Express 3, n. 11 (23 ottobre 2012): 2937. http://dx.doi.org/10.1364/boe.3.002937.
Testo completo
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Bahriah, Yuli, Novita Mila Sari, Rita Rukmawati e Mala Rispa. "PENYULUHAN DAN KONSELING YOGA PADA KEHAMILAN". Community Development Journal : Jurnal Pengabdian Masyarakat 2, n. 3 (25 luglio 2022): 1161–66. http://dx.doi.org/10.31004/cdj.v2i3.2982.
Testo completoAbstract (sommario):
Penyuluhan ini bertujuan untuk meningkatkan pengetahuan ibu hamil mengenai pengertian yoga, manfaat melakukan yoga, kapan boleh melakukan yoga, dan kondisi yang tidak boleh melakukan yoga hamil. di Kelurahan Kemas Rindo terlebih dimasa pandemi Covid-19. Kehamilan merupakan proses fisiologis, tetapi dalam masa kehamilan tersebut ibu hamil memerlukan asuhan kebidanan untuk mengevaluasi kondisi kesehatan dan kehamilannya. Yoga antenatal merupakan keterampilan mengolah pikiran, berupa teknik pengembangan kepribadian secara menyeluruh baik fisik, psikologis dan spiritual. Yoga antenatal dapat membantu ibu hamil untuk mengendalikan pikiran, keinginan dan reaksi terhadap stres. Pengadaan penyuluhan dan konseling yoga pada kehamilan menjadi sarana penting untuk memberikan informasi tentang yoga bagi ibu hamil. Untuk menyampaikan pesan atau materi penyuluhan biasanya bahasa yang digunakan ialah bahasa yang mudah dimengerti dan dipahami sehingga tidak terlalu sulit untuk dimengerti oleh sasaran atau objek penyuluhan. Media yang biasanya digunakan dalam penyuluhan seperti media cetak, dan media elektronik. Metode pengumpulan data dilakukan dengan observasi kepada seluruh peserta Kegiatan dibagi menjadi 3 fase, yaitu fase orientasi, kerja dan terminasi. Kesimpulan dalam kegiatan ini yaitu kegiatan penyuluhan tentang yoga dalam kehamilan berhubungan dengan peningkatan tingkat pengetahuan. Berdasarkan hasil penelitian ini maka perlu dilakukan kegiatan promosi kesehatan secara berkala.
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Gimenez, Luis Espallargas. "Jorge Caron y la cultura arquitectónica de São Paulo". Risco Revista de Pesquisa em Arquitetura e Urbanismo (Online) 21 (21 dicembre 2023): 56–71. http://dx.doi.org/10.11606/1984-4506.risco.2023.223297.
Testo completoAbstract (sommario):
Towers, like obelisks, stand out from a distance, signal places and guide directions in cities, like the Roman Baroque, in a way analogous to dolmens that order and qualify mystical and representative areas. Without covering or protecting, they are typical of the dominant and recognized architecture, they are landmarks of formalistic urbanism. Furthermore, the tower corresponds to a bold construction, to a critical structural problem, whose appropriate complementarity between configuration and construction reveals intelligence and imagination of conceptual, formal and structural options. Architect Jorge Caron does not neglect architectural, permanent and historical aspects in the design of the transmission antenna for TV Cultura. He anticipates the presence of the tower and proposes the metallic geometry that establishes the lattice system, reductive and homogeneous, or uniform. The design of the antenna is related to the discussion of architecture at the end of the 20th century.
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Khoeroh, Himatul, e Hafsah Hafsah. "IMPLEMENTASI ANTENATAL CARE TERPADU SEBAGAI UPAYA DETEKSI DINI ANEMIA PADA IBU HAMIL DI WILAYAH KERJA PUSKESMAS BUARAN". Jurnal Ilmu Kesehatan Bhakti Husada: Health Sciences Journal 14, n. 01 (1 giugno 2023): 127–32. http://dx.doi.org/10.34305/jikbh.v14i01.683.
Testo completoAbstract (sommario):
Antenatal Care (ANC) perlu dilakukan secara terintegrasi untuk mengatasi permasalahan Angka Kematian Ibu (AKI). Pelayanan kehamilan (ANC) yang dilakukan secara teratur dapat mendeteksi lebih awal kondisi kehamilan yang berisiko tinggi seperti anemia, sehingga intervensi dapat segera dilakukan. Kementerian Kesehatan Republik Indonesia telah membuat standar pelayanan kehamilan terpadu (ANC), yaitu ibu melakukan kunjungan ANC minimal 6 kali selama kehamilannya. Layanan yang terkait dengan pencegahan anemia yaitu pemberian Tablet Tambah Darah minimal 90 tablet selama kehamilan yang diberikan sejak kontak pertama. (Mitra, 2021). Penelitian ini bertujuan untuk mengevaluasi program Antenatal Care terpadu sebagai upaya deteksi dini anemia pada ibu hamil dengan unsur input, proses dan output dengan rancangan kualitatif yang disajikan secara deskriptif. Informan awal ditentukan dengan tehnik purposive sampling. Metode pengumpulan data melalui wawancara mendalam, observasi dan dokumentasi terhadap 5 informan awal yang terdiri dari bidan koordinator, tenaga gizi kesehatan, bidan desa dan kader serta ibu hamil trimester III yang mengalami anemia. 1 informan triangulasi yaitu Kepala Seksi Kesehatan Keluarga Dinas Kesehatan Kabupaten Brebes. Hasil penelitian menunjukan pada unsur input sudah cukup baik dari Sumber Daya Manusia (SDM) dan pendanaan sudah terintegrasi, hanya sarana prasaran USG dan cheklis belum terfasilitasi. Pada unsur proses, program terlaksana dengan baik yaitu pelayanan ANC sudah menggunakan standar 10 T, hanya belum ada koordinasi jemput bola di desa yg jaraknya jauh untuk pengadaan pelayanan didesa tersebut secara kerjasama lintas sektoral. Pada unsur output, cakupan pelayanan ANC di puskesmas buaran di angka 85% dengan prevalensi anemia 65 kasus.
Kata kunci: Antenatal Care, Deteksi Dini, Anemia, Ibu Hamil
Tesi sul tema "Antennal bole"
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Marty, Simon. "Influence of social and ecological factors on the evolution of the olfactory system in Hymenoptera". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASL039.
Testo completoAbstract (sommario):
Le mode de vie des animaux repose sur un ensemble de comportements qui nécessitent une détection et un traitement fiables de l'information sensorielle par les circuits neuronaux. Le système olfactif, qui perçoit l'environnement chimique, a été modelé par diverses pressions de sélections, entraînant une diversification de son organisation. L'ordre des Hyménoptères se révèle pertinent pour aborder la question de l'adaptation des traits sensoriels. Il englobe en effet plusieurs transitions écologiques ayant entraîné une grande diversité de modes de vie, de la phytophagie à la prédation, en passant par diverses formes de parasitisme ainsi que plusieurs transitions vers l'eusocialité. L'eusocialité est une forme avancée d'organisation sociale, où des individus aident d'autres individus apparentés à se reproduire au détriment de leur propre reproduction. Du fait de la vulnérabilité des comportements altruistes au parasitisme, les Hyménoptères eusociaux distinguent les membres de leur colonie des étrangers grâce à des mélanges de composés odorants, les hydrocarbures cuticulaires (CHCs). Les fourmis et les frelons détectent les CHCs via le sous-système des sensilles basiconiques, nommé le BaS, qui divise le premier centre olfactif (le lobe antennaire, LA). Les fourmis et les frelons étant indépendamment eusociaux et phylogénétiquement distants, nous avons cherché à retracer l'histoire évolutive du LA chez les Hyménoptères afin de déterminer si l'eusocialité ou d'autres facteurs écologiques participent à façonner le système olfactif. Nous avons d'abord étudié de ce trait en comparant la neuroanatomie de quatorze espèces recouvrant la phylogénie des Formicidae. Malgré des variations significatives dans le volume et le nombre de glomérules, nous avons observé une conservation de l'organisation du LA, avec un investissement relatif généralement constant dans BaS. Nos analyses ont révélé que des traits comportementaux ou sociaux ne semblent pas influencer le LA, mais que la complexité du mélange de CHC semble être un facteur potentiellement déterminant. Nous avons ensuite examiné les Vespidae, qui incluent deux émergences indépendantes de l'eusocialité avec des espèces solitaires apparentées, permettant ainsi de tester si le BaS constitue une adaptation favorisée par l'eusocialité ou un attribut préexistant, hérité d'ancêtres solitaires. Nous avons trouvé que les ancêtres solitaires des espèces sociales étaient déjà pourvus d'un BaS comprenant un grand nombre de glomérules. La distribution des glomérules entre le BaS et le reste du LA varie entre les différentes sous-familles eusociales, tandis que les espèces solitaires possèdent un nombre de glomérules similaire, voire supérieur, dans les deux régions du LA. Ces résultats suggèrent que l'eusocialité ne joue pas un rôle prédominant dans l'évolution du LA. Nous avons ensuite exploré les origines évolutives de ce sous-système en menant une étude comparative du LA chez les Hyménoptères. Nos résultats suggèrent que le BaS est généralement conservé chez la plupart des parasitoïdes, mais qu'il est réduit, voire absent chez les abeilles, ce qui laisse supposer que l'organisation globale du LA chez les Hyménoptères est influencée par le parasitisme et les comportements alimentaires. La variation du nombre d'unités fonctionnelles dans le LA semble être indépendante de l'eusocialité et semble aussi refléter des différences dans les régimes alimentaires. Cette étude comble une lacune importante dans notre connaissance du système olfactif des hyménoptères et apporte un éclairage nouveau sur son évolutionAnimal lifestyles depend on a set of adaptive behaviours that rely on the accurate detection and processing of sensory information within neural circuits. The olfactory system, which perceives the chemical environment, has evolved under diverse selective pressure, diversifying its neural circuits. Hymenoptera represents an ideal order for studying the principles of sensory system adaptation, owing to their diverse lifestyles. From plant feeding to predation, and from diverse forms of parasitism to the repeated evolution of cooperative social structures, Hymenoptera provide numerous opportunities for comparative studies of neural trait evolution. Particularly, eusociality is an advanced form of social organisation, where individuals refrain from their own reproduction for the benefit of reproducing relatives. Due to the vulnerability of altruistic behaviour to exploitation, the evolution of eusociality is hypothesised to be intimately linked with the development of efficient recognition and communication systems. In insects, this recognition involves the perception of odorous compounds known as cuticular hydrocarbons (CHCs), facilitating the discrimination of social partners. In ants and hornets, the detection of CHCs is known to involve the basiconic sensilla subsystem (BaS), which represents a morphological division within the first olfactory processing centre of the brain, the antennal lobe (AL). Given that eusociality evolved independently from solitary ancestors in these two taxa, our investigation focuses on the origin and diversification of this sensory specialisation across solitary and social Hymenoptera, aiming to uncover the influence of social and ecological factors on the olfactory system. We first conducted a comparative study of neural traits within the olfactory system of fourteen ant species distributed across the Formicidae phylogeny. We found that the general organisation of the ant olfactory system is conserved across species, despite remarkable differences in neuropil volume and number of glomeruli. Although we did not identify clear behavioural, ecological, or social traits potentially shaping AL elaboration, our results identified the species-specific complexity of CHC blend composition as a potential driver of neural investment in the BaS subsystem. Then, concentrating on the Vespidae, in which eusociality emerged twice independently, we asked if the BaS subsystem could represent an adaptation driven by the social lifestyle or if it was a pre-existing attribute inherited from solitary ancestors. Based on extensive neuroanatomical data, we show that the solitary ancestors of social species were already equipped with an elaborated BaS subsystem. Moreover, we found divergent AL investment between the different eusocial subfamilies, while solitary species exhibited similar or even greater investment in AL glomeruli. These findings suggest that eusociality has probably not been a major driver of AL evolution. Finally, we investigated the evolutionary origins and elaboration of the BaS subsystem by carrying out a broad comparative neuroanatomical study of the AL across the Hymenoptera. Our data suggest that the BaS subsystem is conserved across most parasitoid and aculeate clades. However, it is remarkably reduced or even lost in bees, indicating that the overall AL organisation in Hymenoptera evolved under strong selection pressure associated with dietary behaviour, rather than the level of social organisation. These studies fill important gaps in our understanding of sensory evolution in Hymenoptera and provide valuable insights into the specific roles of ecological and social factors in driving sensory adaptation
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Cruz, Agnaldo Souza. "Medi??o da densidade ?ssea atrav?s de ondas eletromagn?ticas e classifica??o por MVS". Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15501.
Testo completoAbstract (sommario):
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Previous issue date: 2014-01-13This work holds the purpose of presenting an auxiliary way of bone density measurement through the attenuation of electromagnetic waves. In order to do so, an arrangement of two microstrip antennas with rectangular configuration has been used, operating in a frequency of 2,49 GHz, and fed by a microstrip line on a substrate of fiberglass with permissiveness of 4.4 and height of 0,9 cm. Simulations were done with silica, bone meal, silica and gypsum blocks samples to prove the variation on the attenuation level of different combinations. Because of their good reproduction of the human beings anomaly aspects, samples of bovine bone were used. They were subjected to weighing, measurement and microwave radiation. The samples had their masses altered after mischaracterization and the process was repeated. The obtained data were inserted in a neural network and its training was proceeded with the best results gathered by correct classification on 100% of the samples. It comes to the conclusion that through only one non-ionizing wave in the 2,49 GHz zone it is possible to evaluate the attenuation level in the bone tissue, and that with the appliance of neural network fed with obtained characteristics in the experiment it is possible to classify a sample as having low or high bone density
Este trabalho tem como objetivo apresentar uma t?cnica de medi??o da densidade ?ssea atrav?s da atenua??o de ondas eletromagn?ticas. Para a realiza??o do trabalho, optou-se por um arranjo de antenas de microfita com configura??o retangular, operando em uma frequ?ncia de 2,49GHz, alimentada por uma linha de microfita em um substrato de fibra de vidro com permissividade de 4,4 e altura de 0,9 cm. Foram realizadas simula??es com amostras de s?lica, farinha de osso, blocos de gesso e s?lica para comprova??o da varia??o do n?vel de atenua??o em diferentes combina??es. Por reproduzirem satisfatoriamente os aspectos de anomalia dos seres humanos, foram utilizadas amostras de osso bovino. Elas foram submetidas a pesagem, medi??es e radia??o de micro-ondas. Suas massas foram alteradas e o processo foi repetido. Os dados obtidos foram inseridos em uma rede neural e procedeu-se ao seu treinamento, obtendo-se os melhores resultados, com classifica??o correta em 100% das amostras. Conclui-se que, atrav?s de uma onda n?o-ionizante na faixa de 2,49GHz, que ? poss?vel avaliar o n?vel de atenua??o no tecido ?sseo e que, com aplica??o de rede neural alimentada com caracter?sticas obtidas no experimento, ? poss?vel classificar uma amostra como tendo densidade ?ssea baixa ou alta
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Varão, Ricardo Emanuel Albuquerque. "Levantamento de estatísticas de posse de bola com RFID". Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14572.
Testo completoAbstract (sommario):
Mestrado em Engenharia Eletrónica e TelecomunicaçõesEsta dissertação consistiu no estudo de várias tecnologias nomeadamente o RFID, de forma a conceber um sistema que seja capaz de medir a posse de bola de num jogo de futsal. O estudo focou-se em qual tipo de sistema RFID a utilizar, quais as vantagens e desvantagens de cada um e qual melhor se adequaria para os dipositivos a realizar. Da mesma forma, estudar qual o melhor meio de comunicação sem fios e tipo de arquitetura, apresentando as vantagens e desvantagens de cada um. Após as escolhas feitas, passou-se para a conceção dos dispositivos, projetando e concebendo os circuitos que iriam formar os dispositivos. Por fim, implementar o dispositivo criado nas sapatilhas e na bola, que irão ser utilizados no jogo de futsal. Foram realizadas várias simulações com módulos de desenvolvimento, de modo a atestar se o sistema projetado seria passível de ser implementado. Essas simulações correram tal como esperado, concluindo que os sistema é exequível. Aquando da conceção dos dispositivos do sistema, surgiram alguns problemas na realização das placas dos mesmos, e levaram a contratempos que fizeram com que estes não estivessem prontos a tempo de serem apresentados. Os resultados obtidos foram apenas os provenientes das simulações realizadas com os módulos de desenvolvimento, resultados esses que levam a crer que o sistema tem potencial para ser implementado num futuro próximo.
This dissertation consisted in the study of various technologies including RFID, in order to design a system that is capable of measuring the ball possession in a futsal game. This study focused on what type of RFID system to use, what are the advantages and disadvantages of each one and which are the best suited to perform the devices. Likewise, studying what is the best way of wireless communication and type of architecture, by presenting the advantages and disadvantages of each one. After choosing the technologies to be used, was begun the conception of the devices, by designing and conceiving boards that would form it. Finally, implementing the device in the sneakers and in the ball, that will be used in a futsal game. Several simulations were done with development kits, to certify if the designed system would be liable to be implemented. These simulations ran as expected, concluding that the system is practicable. At the time of the conception of the system devices, some problems emerged when making its boards, which led to setbacks that caused these not to be ready in time for presentation. The achieved results are only from the simulations performed with the development kits, which suggest that the system has the potential to be implemented in the near future.
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Barnard, Daniel David. "Bore sight error analysis in seeker antennas : a fully functional GUI interfaced ray tracing solution". Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/79991.
Testo completoAbstract (sommario):
Thesis (MScEng)--Stellenbosch University, 2013.ENGLISH ABSTRACT: Airborne seeker antennas are usually enclosed within a dielectric radome for protection against their harsh operational environment. However the presence of a radome can introduce serious degrading effects on the radiation and electrical performance of the enclosed antenna. The degradation effect studied in this report is that of Bore Sight Error (BSE). BSE is a squint in the pointing accuracy of the antenna due to the enclosing radome. A ray-tracing approach is presented that is able to analyse the BSE of seeker radomes in general and is especially suited to electrically large radomes where other computational electromagnetic techniques become overly computationally intensive. The ray-tracing algorithm is wrapped in a GUI which, given the radome, antenna, polarisation and incidence plane parameters will compute the BSE for any set of requested scan angles. Close agreement was obtained with measured BSE performance available in literature. Due to easy setup and fast computation time it is demonstrated that the GUI can be efficiently used for iterative radome design and optimisation.
AFRIKAANSE OPSOMMING: Luggedrae soekantennes is normaalweg omhul binne ‘n dielektriese antennekoepel vir beskerming teen ‘n strawwe omgewing. Die teenwoordigheid van ‘n antennakoepel kan egter ernstige nadelige effekte op die straling en elektriese werkverrigting van die omhulde antenne hê. Die nadelige effek wat in hierdie verslag ondersoek word, is dié van die “Bore Sight Error (BSE).” BSE is ‘n afwyking in die akkuraatheid van die antenna se rigtingwysing as gevolg van die antennakoepel. Straal-natrekking wat die BSE van soek-antennekoepels in die algemeen kan analiseer word beskryf. Hierdie tegniek is veral gepas vir elektries groot antennekoepels waar die berekenige vir EM tegnieke te intensief raak. Die straalnatrekkingsalgoritme word omvat in ‘n grafiese gebruikerskoppelvlak. Gegee die parameters van die antennekoepel, antenne, polarisasie en invallende vlak, sal die BSE vir enige stel skandeerhoeke bereken word. Goeie ooreenstemming was verkry, vergeleke met gemete BSE vanuit die literatuur. Die eenvoudige opstel van die koppelvlak en vinnige berekeningstyd wys daarop dat die koppelvlak doeltreffend gebruik kan word vir iteratiewe antennekoepel ontwerp en optimering.
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Kübler, Linda Sara [Verfasser], Jürgen [Gutachter] Bolz, Bill S. [Gutachter] Hansson e Mattias [Gutachter] Larsson. "Processing of Complex Host Blends in the Moth Antennal Lobe / Linda Sara Kübler ; Gutachter: Jürgen Bolz, Bill S. Hansson, Mattias Larsson". Jena : Friedrich-Schiller-Universität Jena, 2012. http://d-nb.info/1177655489/34.
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Ghorbani, A., Raed A. Abd-Alhameed, Neil J. McEwan e Dawei Zhou. "An Approach for Calculating the Limiting Bandwidth-Reflection Coefficient Product for Microstrip Patch Antennas". 2006. http://hdl.handle.net/10454/3458.
Testo completoAbstract (sommario):
NoThe bandwidth of a microstrip patch antenna is expressed in terms of minimum achievable reflection coefficient using an equivalent circuit and the Bode-Fano theory. The bandwidth-reflection coefficient product is found to be proportional to antenna height and largely independent of feed probe position, for small bandwidths. The product can be computed directly from a numerical evaluation of the first-order Bode-Fano integral. Curves are presented showing how the product becomes limited by the feed probe inductance at very large bandwidths. It is concluded that this effect is unlikely to be a limit on the potential bandwidth of a practical patch antenna. If as a minimal correction the feed inductance is tuned out, the realized bandwidth with low order matching or optimal over-coupling shows the expected relationship to the theoretical limit.
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Bacles-Min, Guillaume. "Architecture et Intégration d'un module de type Smart-Dust". Phd thesis, 2009. http://tel.archives-ouvertes.fr/tel-00790778.
Testo completoAbstract (sommario):
Les progrès technologiques réalisés dans le domaine de l'intégration de fonctions sur des surfaces de plus en plus petites a permis le développement de l'informatique diffuse, c'est-à-dire, intégrée dans notre espace et mise en œuvre par des objets du quotidien ou des structures spécifiques. Nous nous intéressons dans ce travail à ces structures couramment appelées " capteurs sans fil " car leur fonction est de capter des informations dans leur environnement et de les transmettre ensuite. Ces structures autonomes sont constituées d'un capteur, d'une partie numérique pour le traitement des données et la gestion de la structure, d'un système de communication et d'une alimentation. Afin d'être discrète, cette structure doit être de petite taille. Dans ce but, il est nécessaire que toutes ses composantes soient intégrées ensemble. L'antenne de la partie communicante est aujourd'hui un frein à cette intégration car les fréquences utilisées font qu'elle a des dimensions très supérieures à celles du reste de la structure et, même intégrée, ses propriétés vont être perturbées par le packaging de la structure. Autre point, ces antennes sont souvent omnidirectionnelles, ce qui, en termes d'économies d'énergie, cruciales dans ce domaine, n'est pas une solution optimale. Dans ce contexte, la première partie de ce rapport présente les applications envisagées et envisageables pour les réseaux de capteurs sans fil. Un historique puis un état de l'art sont ensuite proposés pour identifier les différentes stratégies mises en œuvre dans la conception de plates-formes ainsi que les acteurs académiques et industriels. Une synthèse vient justifier l'orientation à prendre dans le cadre de ce travail et clôt cette partie. La deuxième partie traite de la façon d'appliquer des réseaux d'antennes dans les réseaux de capteurs sans fil. L'idée étant d'utiliser les nœuds du réseau comme éléments du réseau d'antenne, créant ainsi un réseau où les éléments ne sont pas liés physiquement. Cette perspective est étudiée par le biais de deux scénarios caractéristiques des applications des capteurs sans fil. Dans chacun son application est testée et des solutions sont proposées et détaillées grâce à l'outil de calcul Matlab. Une partie finale discute des limitations pour utiliser les réseaux d'antennes dans les réseaux de capteurs sans fil. La dernière partie aborde la conception d'antennes spécifiques aux capteurs sans fil pour des applications en extérieur. Un concept d'antenne-package est présenté et développé sur différentes architectures d'antennes qui ont, de ce fait, des formes en volume. Des structures cubiques et sphériques sont proposées, conçues et simulées. L'attention se porte sur leur diagramme de rayonnement, leur robustesse et leur faculté à pouvoir garder leurs propriétés même placées dans un environnement et avec des composants placés à l'intérieur. Deux structures, une cubique et une demi-boule, présentent des profils intéressants, la deuxième étant un réseau d'antennes à elle-seule. Agile, elle permet de balayer tout le demi-espace supérieur qui l'entoure avec une bonne efficacité. Enfin, une partie conclusive montre la contribution apportée et propose des perspectives de travail en lien avec les antennes et plus généralement avec la partie communicante et l'architecture des nœuds.
Capitoli di libri sul tema "Antennal bole"
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I. Kanaan, Amenah, e Ahmed M.A. Sabaawi. "Implantable Wireless Systems: A Review of Potentials and Challenges". In Antenna Systems [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99064.
Testo completoAbstract (sommario):
With the current advancement in micro-and nano-fabrication processes and the newly developed approaches, wireless implantable devices are now able to meet the demand for compact, self-powered, wireless, and long-lasting implantable devices for medical and health-care applications. The demonstrated fabrication advancement enabled the wireless implantable devices to overcome the previous limitations of electromagnetic-based wireless devices such as the high volume due to large antenna size and to overcome the tissue and bone losses related to the ultrasound implantable devices. Recent state-of-the-are wireless implantable devices can efficiently harvest electromagnetic energy and detect RF signals with minimum losses. Most of the current implanted devices are powered by batteries, which is not an ideal solution as these batteries need periodic charging and replacement. On the other hand, the implantable devices that are powered by energy harvesters are operating continuously, patient-friendly, and are easy to use. Future wireless implantable devices face a strong demand to be linked with IoT-based applications and devices with data visualization on mobile devices. This type of application requires additional units, which means more power consumption. Thus, the challenge here is to reduce the overall power consumption and increase the wireless power transfer efficiency. This chapter presents the state-of-the-art wireless power transfer techniques and approaches that are used to drive implantable devices. These techniques include inductive coupling, radiofrequency, ultrasonic, photovoltaic, and heat. The advantages and disadvantages of these approaches and techniques along with the challenges and limitations of each technique will be discussed. Furthermore, the performance parameters such as operating distance, energy harvesting efficiency, and size will be discussed and analyzed to introduce a comprehensive comparison. Finally, the recent advances in materials development and wireless communication strategies, are also discussed.
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Oakley, Ann. "Lessons Learnt". In From Here to Maternity, 244–62. Policy Press, 2018. http://dx.doi.org/10.1332/policypress/9781447349341.003.0011.
Testo completoAbstract (sommario):
This chapter looks back on the process of becoming a mother, as women come to understand the visions they had — of motherhood as a bed of roses, of birth as agony or ecstasy, of pregnancy as a flowering or a burden. After the event these images are brought sharply into focus by the contrast medium of reality, which exposes the outline of what was, too often, a romantic dream. More than a third of the women interviewed for this study said they found becoming a mother a difficult experience. Eight out of ten said it had been different from what they had expected. The same proportion thought the pictures of pregnancy, birth, and motherhood conveyed in antenatal literature, women's magazines, and the media in general were too romantic, painting an over-optimistic portrait of happy mothers and fathers, quiet contented babies, and neat and shining homes that bore little resemblance to the chaos, disruption, and confusion of first-time motherhood.
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Henshaw, Denis L., Fiorella Belpoggi, Daniele Mandrioli e Alasdair Philips. "Electromagnetic Fields". In Textbook of Children's Environmental Health, 617–34. 2a ed. Oxford University PressNew York, 2024. http://dx.doi.org/10.1093/oso/9780197662526.003.0046.
Testo completoAbstract (sommario):
Abstract Electric and magnetic fields (electromagnetic fields, EMF) arise wherever electricity is generated, transmitted, or distributed. Exposure to EMFs is ubiquitous in the modern environment. EMF exposures can occur at extremely low frequencies (ELF) from personal electric appliances such as hair dryers and shavers. EMF exposures can also occur at radiofrequencies from radar installations, smart meters, base-station antennas, and mobile phones. Children appear to be particularly vulnerable to EMF. Mobile phone use in children is associated with exposures to radiofrequency energy in the brain at levels that are two times higher than those associated mobile phone use by adults. Mobile phone use in children is associated additionally with exposures in the bone marrow of the skull that are up to 10 times higher than those experienced by adults. The mechanisms by which EMFs interact with the human body are not fully understood. The strongest although still very limited scientific evidence for health effects of long-term ELF-EMF exposures is the finding of an approximately two-fold increased risk of leukemia in children exposed in their homes to ELF magnetic fields of more than 0.3−0.4 µT (micro-Tesla). The International Agency for Research on Cancer (IARC) has classified “extremely low-frequency magnetic fields” as well as “radiofrequency electromagnetic fields” as possibly carcinogenic to humans (Group 2B) and “static electric and magnetic fields and extremely low-frequency electric fields” as not classifiable as to their carcinogenicity to humans (Group 3).
Atti di convegni sul tema "Antennal bole"
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Shrivastava, Nishtha, Debalina Ghosh e Prasant Kumar Sahu. "A Clustering Approach for Understanding Bone Health using RF Transmission Characteristics". In 2024 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), 160–64. IEEE, 2024. http://dx.doi.org/10.1109/apwc61918.2024.10701847.
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Scazzola, Alberto, Adrien Merlini, Clément Henry e Francesco P. Andriulli. "A Preconditioned Inverse Scattering Scheme for High-Contrast Bone Imaging at Microwave Frequencies". In 2024 IEEE International Symposium on Antennas and Propagation and INC/USNC‐URSI Radio Science Meeting (AP-S/INC-USNC-URSI), 429–30. IEEE, 2024. http://dx.doi.org/10.1109/ap-s/inc-usnc-ursi52054.2024.10686480.
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Fortinberry, Jarrod, e Thomas H. Shumpert. "Measurement of antenna bore-sight gain". In 2016 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium). IEEE, 2016. http://dx.doi.org/10.1109/usnc-ursi.2016.7588521.
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Meaney, Paul M., Douglas Goodwin, Amir Golnabi, Matthew Pallone, Shireen Geimer e Keith D. Paulsen. "3D Microwave bone imaging". In 2012 6th European Conference on Antennas and Propagation (EuCAP). IEEE, 2012. http://dx.doi.org/10.1109/eucap.2012.6206024.
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Ruchi Kerketta, Shilpi, e Debalina Ghosh. "Microwave Analysis on Bone Mineral Density". In 2020 International Symposium on Antennas & Propagation (APSYM). IEEE, 2020. http://dx.doi.org/10.1109/apsym50265.2020.9350679.
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Barros, J. D., J. J. de Oliveira e S. G. da Silva. "Characterization of bone tissue using microstrip antennas". In 2010 32nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC 2010). IEEE, 2010. http://dx.doi.org/10.1109/iembs.2010.5627984.
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Alon, Leeor. "Bore-Lining Slot Antennas for 7T Body MRI". In 2018 International Conference on Electromagnetics in Advanced Applications (ICEAA). IEEE, 2018. http://dx.doi.org/10.1109/iceaa.2018.8520390.
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Alrawashdeh, Rula, Yi Huang e Aznida Abu Bakar Sajak. "A flexible loop antenna for biomedical bone implants". In 2014 8th European Conference on Antennas and Propagation (EuCAP). IEEE, 2014. http://dx.doi.org/10.1109/eucap.2014.6901898.
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Moyo, Wongani, Ahmed Allam, Asano Tanemasa e Adel B. Abdel-Rahman. "Metamaterial based unidirectional antenna for bone fracture detection". In 2023 11th International Japan-Africa Conference on Electronics, Communications, and Computations (JAC-ECC). IEEE, 2023. http://dx.doi.org/10.1109/jac-ecc61002.2023.10479606.
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Cannatà, Alessia, Adnan Elahi, Martin O'Halloran, Marco Pasian, Simona Di Meo, Giulia Matrone e Bilal Amin. "Microwave Tomography Bone Imaging: Analysing the Impact of Skin Thickness on the Reconstruction of Numerical Bone Phantoms". In 2024 18th European Conference on Antennas and Propagation (EuCAP). IEEE, 2024. http://dx.doi.org/10.23919/eucap60739.2024.10501621.
Testo completoRapporti di organizzazioni sul tema "Antennal bole"
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Rasmussen, D. A., e R. L. Freeman. THE DESIGN OF AN RF ANTENNA FOR A LARGE-BORE, HIGH POWER, STEADY STATE PLASMA PROCESSING CHAMBER FOR MATERIAL SEPARATION - CRADA FINAL REPORT for CRADA Number ORNL00-0585. Office of Scientific and Technical Information (OSTI), novembre 2001. http://dx.doi.org/10.2172/1134263.
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