Bibliographies thématiques / Antenna stampata in 3D

Littérature scientifique sur le sujet « Antenna stampata in 3D »

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Publié le 10 mars 2023

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Articles de revues sur le sujet "Antenna stampata in 3D"

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KANAYAMA, Naoki, Makoto KANEKO et Toshio TSUJI. « 3D Artificial Active Antenna ». Transactions of the Society of Instrument and Control Engineers 31, no 12 (1995) : 1915–23. http://dx.doi.org/10.9746/sicetr1965.31.1915.

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Senanayake, Pradeep, Chung-Hong Hung, Joshua Shapiro, Adam Scofield, Andrew Lin, Benjamin S. Williams et Diana L. Huffaker. « 3D Nanopillar optical antenna photodetectors ». Optics Express 20, no 23 (25 octobre 2012) : 25489. http://dx.doi.org/10.1364/oe.20.025489.

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Olivová, Jana, Miroslav Popela, Marie Richterová et Eduard Štefl. « Use of 3D Printing for Horn Antenna Manufacturing ». Electronics 11, no 10 (11 mai 2022) : 1539. http://dx.doi.org/10.3390/electronics11101539.

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This article describes the manufacturing of a horn antenna using a 3D commercial printer. The horn antenna was chosen for its simplicity and practical versatility. The standardised horn antenna is one of the most widely used antennas in microwave technology. A standardised horn antenna can be connected to standardised waveguides. The horn antenna has been selected so that this antenna can be fabricated by 3D printing and thus obtain the equivalent of a standardised horn antenna. This 3D horn antenna can then be excited by a standardised waveguide. The 3Dprinted horn antenna with metallic layers has very good impedance characteristics, standing wave ratio and radiation patterns that are close to those of a standardised horn antenna. The 3D-based horn antenna is suitable for applications where low antenna weight is required, such as aerospace and satellite technologies. The article also describes a manufacturing procedure for a horn antenna (E-sector horn antenna) that is plated with galvanic layers of silver and gold. The design of the plated horn antenna in the Matlab application using the Antenna Toolbox extension is also described, including 3D printing procedures, post-processing procedures (plating) and practical testing of its functionality. The measured results are compared to simulations of the standardised horn antenna and then analysed.
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Jordão, Marina, Diogo Pires, Daniel Belo, Pedro Pinho et Nuno Borges Carvalho. « 3D Antenna Characterization for WPT Applications ». Sensors 21, no 13 (29 juin 2021) : 4461. http://dx.doi.org/10.3390/s21134461.

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The main goal of this paper is to present a three-dimensional (3D) antenna array to improve the performance of wireless power transmission (WPT) systems, as well as its characterization with over-the-air (OTA) multi-sine techniques. The 3D antenna consists of 15 antenna elements attached to an alternative 3D structure, allowing energy to be transmitted to all azimuth directions at different elevation angles without moving. The OTA multi-sine characterization technique was first utilized to identify issues in antenna arrays. However, in this work, the technique is used to identify which elements of the 3D antenna should operate to transmit the energy in a specific direction. Besides, the 3D antenna design description and its characterization are performed to authenticate its operation. Since 3D antennas are an advantage in WPT applications, the antenna is evaluated in a real WPT scenario to power an RF–DC converter, and experimental results are presented.
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Hui, P., C. G. Hynes, J. V. Wonterghem et D. G. Michelson. « 3D autocorrelation coefficients of dipole antenna ». Electronics Letters 42, no 5 (2006) : 257. http://dx.doi.org/10.1049/el:20063956.

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Friedrich, Aline, Bernd Geck, Oliver Klemp, Adrian Posselt et Ingo Kriebitzsch. « 3D Antenna Systems Design and Validation ». ATZelektronik worldwide 9, no 6 (24 novembre 2014) : 22–27. http://dx.doi.org/10.1365/s38314-014-0287-x.

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Huang, C. U., I. Y. Chen, H. J. H. Chen, C. F. Jou et S. R. S. Huang. « Compact 3D-MEMS-meander monopole antenna ». Electronics Letters 41, no 21 (2005) : 1149. http://dx.doi.org/10.1049/el:20052677.

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Kim, Kuntae, Jong-Yeon Park, Yong-Hee Han, Ho-Kwan Kang, Hyun-Joon Shin, Sung Moon et Jung-Ho Park. « 3D-feed horn antenna-coupled microbolometer ». Sensors and Actuators A : Physical 110, no 1-3 (février 2004) : 196–205. http://dx.doi.org/10.1016/j.sna.2003.09.018.

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Gu, Chao, Steven Gao, Vincent Fusco, Gregory Gibbons, Benito Sanz-Izquierdo, Alexander Standaert, Patrick Reynaert et al. « A D-Band 3D-Printed Antenna ». IEEE Transactions on Terahertz Science and Technology 10, no 5 (septembre 2020) : 433–42. http://dx.doi.org/10.1109/tthz.2020.2986650.

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Lin, Chia-Ching, et Richard W. Ziolkowski. « Dual-band 3D magnetic EZ antenna ». Microwave and Optical Technology Letters 52, no 4 (11 février 2010) : 971–75. http://dx.doi.org/10.1002/mop.25067.

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Thèses sur le sujet "Antenna stampata in 3D"

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Johnson, Brent, Colin Madrid, Kevin Yiin, Hanwen Wang, Chengxi Li et Xizhi Tan. « 3D Printed Antennas for Wireless Communication ». International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596460.

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ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NV
This paper describes the details of design and critical analysis of the process of 3D printing antennas for wireless communications applications. The subjective testing methods utilized were chosen specifically based on project scope and researcher capability. Our results indicate that more work is necessary in this field but that the basic idea is feasible.
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Thorell, Alexander, et Jonas Cederberg. « Designing a Hyperbolic Lens Antenna using 3D Printing Technology ». Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-293894.

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To increase capacity, lower latency, and boostdata rates, new higher gain antennas that can transmitmillimeter-waves are needed. Dielectric lens antennas arean attractive potential solution. The J1-project investigatedthe permittivity and losses of four 3D printing filamentsin four frequency bands, to better design a hyperboliclens antenna in the Ka-band with a WR-28 StandardGain Horn Antenna acting as a feed. To measure thedielectric filaments, the TRL calibration method wasevaluated in simulation and employed in measurementstogether with the NRW method for permittivity extraction.Shortcomings of these methods near resonant frequencieswere marginally analyzed in simulation, and the results ofthe processed measured permittivities were shown to havesignificant uncertainty in the loss tangent. Nevertheless thedatasheet specified<(r) =3 was shown to have meanrelative permittivity∗r= 3.53−0.13jin the Ka-band.Using the measurement data, a hyperbolic lens antennawas designed and optimized in simulation for the centerfrequency of the Ka-band at 33.25 GHz. The simulatedresults show an aperture efficiency of 36.2% and a gainof 30.4 dBi.
För att öka kapaciteten, sänka för- dröjningen samt höja datahastigheterna så behövs högre förstärkta antenner som kan transmittera millimetervågor. Här är dielektriska linsantenner en attraktiv, potentiell lösning. J1-projektet undersökte permittiviteten och förlusterna av fyra 3D-utskriftsfilament i fyra frekvensband, för att bättre designa en hyperbolisk linsantenn i Ka- bandet för en matande WR-28 “Standard Gain Horn Antenna”. För att kunna mäta de dielektriska filamenten så var TRL-kalibreringsmetoden utvärderad i simulering och nyttjad vid mätning tillsammans med NRW-metoden för att betsämma permittiviteten. Nackdelarna bakom dessa metoder nära resonanta frekvenser var marginellt analyserade i simulering och resultaten av de behandlade, mätta permittiviteterna visade sig ha märkbara osäker- heter i deras förlusttangens. Oavsett så blev medelvärdet på det uppmätta resultatet; av det databladsspecificerade materialet R (∈r) = 3; ∈*r = 3,53 -0,13j i Ka-bandet. Med hjälp av databladsspecifikationerna, så designades samt optimiserades en hyperbolisk linsantenn i simulering för Ka-bandets mittfrekvens på 33,25 GHz. De simulerade resultaten visar på en apertureffektivitet på 36,2% och en förstärkning på 30,4 dBi.
Kandidatexjobb i elektroteknik 2020, KTH, Stockholm
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Wu, Junqiang. « ANTENNA RADIATION PATTERN CONTROL BASED ON 3D PRINTED DESIGN ». International Foundation for Telemetering, 2016. http://hdl.handle.net/10150/624254.

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Dielectric materials have been applied in modifying the antenna radiation pattern, but it is usually limited to single-beam applications. The goal of this paper is to present a novel methodology to control the antenna radiation pattern based on 3D printing technology. 3D printing enables arbitrary dielectric distribution at different locations. As a result, different radiation patterns can be realized by loading an optimized dielectric material with varied permittivity. In this work, we propose a design of a quarter-wavelength monopole antenna surrounded by a low-profile 3D-printed polymer structure with an optimized dielectric distribution. Unlike the conventional omnidirectional pattern of the monopole antenna, singlebeam and multiple-beam patterns are achieved using genetic algorithm (GA) optimization.
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Wu, Junqiang, Ahmed H. Abdelrahman, Xiaoju Yu et Min Liang. « ANTENNA RADIATION PATTERN CONTROL BASED ON 3D PRINTED DESIGN ». International Foundation for Telemetering, 2016. http://hdl.handle.net/10150/624266.

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Dielectric materials have been applied in modifying the antenna radiation pattern, but it is usually limited to single-beam applications. The goal of this paper is to present a novel methodology to control the antenna radiation pattern based on 3D printing technology. 3D printing enables arbitrary dielectric distribution at different locations. As a result, different radiation patterns can be realized by loading an optimized dielectric material with varied permittivity. In this work, we propose a design of a quarter-wavelength monopole antenna surrounded by a low-profile 3D-printed polymer structure with an optimized dielectric distribution. Unlike the conventional omnidirectional pattern of the monopole antenna, singlebeam and multiple-beam patterns are achieved using genetic algorithm (GA) optimization.
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Phan, Hong Phuong. « Conception d'antennes 2D et 3D sur des matériaux flexibles ». Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT106/document.

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Le travail de thèse a été réalisée dans le cadre du projet ANR «Stick’It» visant à développer de nouvelles technologies peu coûteuses et innovantes dédiées à la conception de composants radiofréquences (RF) 2D, 2,5D et 3D, notamment des antennes imprimées sur des matériaux conformes. Les applications ciblées sont principalement des appareils de réseaux domestique, tels que les décodeurs, dont les formes et les dimensions sont très variées. Par conséquent, il est nécessaire de concevoir des antennes sur des substrats souples.Selon nos besoins pour un matériau de substrat flexible, peu coûteux, avec de bonnes propriétés RF, la capacité de recyclage et en particulier la capacité à fabriquer des structures 3D, après avoir étudié différents matériaux diélectriques pour l’électronique flexible, le papier s'est trouvé le plus adapté.Les travaux de cette thèse se sont déroulés en trois phases.Dans la première phase, c'était l'étude des méthodes de caractérisation des matériaux pour obtenir leurs propriétés électromagnétiques. Après l'analyse, la méthode de perturbation utilisant une cavité cylindrique a été choisie pour la caractérisation du papier. Les premiers résultats de ce processus ont été vérifiés en réalisant et en testant des antennes simples telles que des monopoles alimentés par CPW sur du papier et du PET. Ensuite, la mesure du papier E4D a été effectuée avec 50 échantillons découpés dans différentes feuilles de papier E4D de trois épaisseurs différentes, 104 m, 210 m et 387 m. Les résultats ont été analysés statistiquement et ont donné r = 3.184, tan = 0.092. Les dispersions des résultats mesurés à 2,5 GHz sont 0.25% pour r et 0.26% pour tan. Ces résultats ont été utilisés pour la phase suivante.Au cours de la deuxième phase, les antennes différentes ont été conçues sur le papier E4D d'épaisseur 0,104 mm et 0,21 mm, notamment des IFA, des antennes SIW et des antennes monopoles alimentées par une ligne microruban. Les prototypes ont été réalisés à l'aide d'une technique de sérigraphie et testés pour déterminer les propriétés de l'adaptation et les diagrammes de rayonnement.Dans la troisième phase, les antennes proposées ont été étudiées dans des conditions d'emballage réalistes, où un boîtier décodeur était en plastique ABS avec différentes dimensions. Le premier cas concernait deux antennes MIMO placées orthogonalement dans des boîtiers ABS différents, avec un espace suffisant pour que les deux puissent rester plats. Le second cas était une boîte à hauteur limitée, de sorte qu’au moins une des antennes doit être pliée.Ainsi, une étude de l'effet de flexion a été réalisée, tout d'abord avec un simple dipôle droit et un monopole droit sur le papier E4D, puis avec une antenne à large bande proposée dans la seconde phase. L’étude a montré que la flexion n’affecte pas beaucoup l’adaptation de l’antenne sur une large bande de fréquences. Cependant, ses diagrammes de rayonnement tournent dans le plan E avec un angle de rotation dépendant de la position de pliage et de l'angle de flexion.Ensuite, le système MIMO de deux antennes placé orthogonalement dans un boîtier ABS de hauteur limitée, de sorte qu’une antenne doit être pliée et une autre reste plate. Dans tous les cas de système d'antenne MIMO, nous avons obtenu une bonne isolation (> 20 dB) et un coefficient de corrélation (ECC) inférieur à 0,05
The thesis was carried out within the ANR project « Stick’It » that aimed at developing new, low-cost and innovative technologies devoted to the design of 2D, 2,5D and 3D radiofrequency (RF) components including antennas printed on conformable materials. The targeted applications are primarily home-networking devices such as set-top boxes where their forms and dimensions are widely varied. Therefore, it is necessary to design antennas on flexible substrates.According to our needs for a substrate material that is flexible, low cost, with good RF properties, recycling ability, and especially ability to make 3D structures, after considering various dielectric materials for flexible electronics, paper substrate appeared to be the most suitable for our purpose.The work of this thesis conducted in three phases.In the first phase, it was the study of methods for characterization of materials to obtain their electromagnetic properties. After analysis, the method of perturbation using a cylindrical cavity was chosen for characterization of paper. The first results of this process were verified by realization and testing of simple antennas such as CPW-fed monopoles on paper and PET. Then, the measurement of E4D paper substrate was performed with 50 samples cut from various E4D paper sheets of three different thicknesses, 104 m, 210 m and 387 m. The results were analyzed statistically and gave r = 3.184, tan = 0.092.The dispersions of the results measured at 2.5 GHz are 0.25% for r and 0.26% for tan. These results were used for the next phase.In the second phase, different antennas were designed on 0.104-mm and 0.21-mm thick E4D paper including IFAs, SIW cavity-back antenna and microstrip-fed wideband monopole antennas. The prototypes were realized using screen printing technique and tested for matching property and radiation patterns.In the third phase the proposed antennas were studied in realistic package conditions, where a set-top box was made of ABS plastic with different dimensions. The first case was with two MIMO antennas orthogonally located in different ABS boxes with sufficient space, so that both of them can remain flat. The second case was a box with a restricted height, so that at least one of the antennas needs to be bent.Thus, a study of bending effect was carried out, first of all, with a simple straight dipole and a straight monopole on E4D paper, then with a wideband antenna proposed in the second phase. The study showed, that bending does not much affect the matching of the antenna over a wide frequency band. However, its radiation patterns rotate in the E-plane with a rotation angle depending on the bending location and bending angle.Then, the MIMO system of two antennas placed orthogonally in an ABS box with restricted height so that one antenna needed to be bent and another remained flat. In all cases of MIMO antenna system, we obtained good isolation (>20 dB) and Envelope Correlation Coefficient (ECC) less than 0.05
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Dvořák, Václav. « 3D tištěná směrová anténa ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-400534.

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This master thesis deals with a study of directional antennas, followed by their design and optimalization of horn antenna based on SIW for Ka band (26,5- 40 GHz). The first part of the thesis contains the theoretical analysis of the different types of directional antennas, also the SIW technology is described here. It also describes the 3D printing technology by means of which the final antenna should be made. The next part of this work is about design of horn antenna based on SIW. Simulation and optimization of the antenna will be done using the CST Microwave Studio. The final part of the thesis deals with evaluation of achieved results.
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LIU, BOSUI. « VERTICALLY INTERCONNECTED WIDE-BANDWIDTH MONOLITHIC PLANAR ANTENNAS FOR 3D-IC ». University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1040154281.

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Abdesalam, Mosa Aboabdalla. « Non-Uniform 3D Antenna Array Optimal Configuration via Extremum Seeking Control ». University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1480723557369506.

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Maritz, Andries Johannes Nicolaas. « Investigation and design of a slotted waveguide antenna with low 3D sidelobes ». Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4161.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2010.
ENGLISH ABSTRACT: An investigation into the cause of undesired sidelobes in the 3D radiation pattern of slotted waveguide arrays is conducted. It is hypothesized that the cross-polarization of the antenna is at fault, along with the possibility that an error is made when designing a linear array. In investigating and finding a solution to the problem, the “Z-slot ” is introduced in conjunction with polarizer plates. The base components are used by a custom optimization algorithm to design reference and solution antennas. Results of the antennas are then compared to ascertain the cause and possible solutions for the unwanted sidelobes. The generic nature of the process may be used to characterize other arbitrary aperture configurations and to design larger antennas.
AFRIKAANSE OPSOMMING: ‘n Ondersoek om die oorsaak van ongewensde sylobbe in die 3D uitstraalpatroon van golfleier-antennas vas te stel. Die hipotese is dat die probleem ontstaan uit die kruis-polarisasie van die antenna, tesame met ‘n verkeerdelikke aanname dat die opstelling liniêr is. Die “Z-Gleuf” tesame met polariseringsplate word voorgestel as hulpmiddel om die moontlikke oorsake te ondersoek. ‘n Gespesialiseerde optime erings-algoritme benut hierdie basiskomponente om beide verwysings- en oplossing-antennas te ontwerp. Resultate van die ontwerpde antennas word dan vergelyk om die oorsaak van die ongewensde sylobbe te vas te stel. Die generiese aard van die proses kan toegepas word op enige gleuf-konfigurasie en om groter antennas mee te ontwerp.
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Hossain, Mohammad Ababil. « Beam Steerable Reconfigurable Antenna with Smart RF Switching on 3D Parasitic Level ». DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/5483.

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Traditional antennas have a lot of limitations as their performance is usually fixed by their initial geometry. On the other hand, modern communication systems are getting way to complicated compared to their earlier counterparts. This necessitates some special types of smart or reconfigurable antennas, which can dynamically adapt to the requirements of the communication systems more effectively. Using conventional single functional antennas is therefore not an efficient approach in these sort of communication systems. Considering all these factors, in this thesis, a beam steerable reconfigurable antenna system is presented that can yield the radiation patterns of multiple antennas with a single structure, necessary for 5G communication. This antenna system occupies comparatively much smaller space and can provide highly directive gain at different directions. It is expected that- in near future, further improvements of this type of antenna system can be performed to pave the way for some additional necessary functions required in modern communication systems.
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Livres sur le sujet "Antenna stampata in 3D"

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Isometrici, Quaderni Quaderni. Quaderno Isometrico - Griglia a Punti : Per Disegno 3D - Distanza Tra I Punti 5 Mm - Griglia Stampata con Inchiostro Nero Su Entrambi I Lati Del Foglio - 200 Pagine - A4 , Non Perforato. Independently Published, 2020.

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Chapitres de livres sur le sujet "Antenna stampata in 3D"

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Kulkarni, Atul M., Garima Saini, Shyam S. Pattnaik et Ravindra A. Pardeshi. « 3D Printing in Antenna Design ». Dans 3D Printing of Sensors, Actuators, and Antennas for Low-Cost Product Manufacturing, 31–60. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9781003194224-3.

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Pyattaev, Alexander, Dmitri Solomitckii et Aleksandr Ometov. « 3D Folded Loop UAV Antenna Design ». Dans Lecture Notes in Computer Science, 269–81. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-02931-9_22.

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Jain, Chahat, et Balwinder S. Dhaliwal. « The Future of Antenna Fabrication : 3D Printing Technology ». Dans Lecture Notes in Civil Engineering, 477–86. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9554-7_43.

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Khashimov, Amur B., et Rinat R. Salikhov. « On the Correspondence of Asymptotic Solutions to 2D and 3D Problems in Antenna Engineering ». Dans Practical Models of Antenna Systems, 1–44. Singapore : Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-6219-6_1.

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Yu, Qiaoying, Kefei Liao, Shan Ouyang, Ningbo Xie et Jifa Shen. « 3D-SAR Imaging with Improved Frequency Diverse Array Antenna ». Dans Proceedings of the 11th International Conference on Computer Engineering and Networks, 1605–12. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-6554-7_177.

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Ullah, Md Amanath, Farhad Bin Ashraf, Touhidul Alam, Mohd Tarmizi Ali et Mohammad Tariqul Islam. « A Reflector Type 3D Triband Directional Antenna for CubeSat Applications ». Dans Space Science and Communication for Sustainability, 285–93. Singapore : Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6574-3_24.

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Zhao, Pengbing, Jin Huang, Yupeng Yang, Jianjun Wang et Fanbo Meng. « 3D Printing Technology of the Conformal Load Bearing Antenna Structure ». Dans Lecture Notes in Electrical Engineering, 839–47. Singapore : Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9437-0_86.

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Meel, Krishna, Ram Gopal et Deepak Bhatnagar. « A 3D Analytic Modeling of Threshold Voltages of FD SOI MOSFET ». Dans Advances in Antenna, Signal Processing, and Microelectronics Engineering, 121–48. Includes bibliographical references and index. : Apple Academic Press, 2021. http://dx.doi.org/10.1201/9781003006190-6.

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Nadeem, Iram, Dong-You Choi, Sun-kuk Noh, Jiwan Ghimire et Ho-Gyun Yu. « 3D Circular Embedded Antenna Mounted on Coaxial Feeding for Future Wideband Applications ». Dans Advances in Intelligent Systems and Computing, 132–42. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03402-3_10.

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Kumar, Sanjeev, Rupinder Singh, Amrinder Pal Singh et Yang Wei. « Flexible and Wearable Patch Antenna Using Additive Manufacturing for Modern Wireless Applications ». Dans 3D Printing of Sensors, Actuators, and Antennas for Low-Cost Product Manufacturing, 107–22. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9781003194224-6.

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Actes de conférences sur le sujet "Antenna stampata in 3D"

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Nguyen, Quang, Theodore Anthony et Amir I. Zaghloul. « Ultra-Wideband 3D Tapered Aperture Antenna -3D Vivaldi Antenna ». Dans 2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (AP-S/USNC-URSI). IEEE, 2022. http://dx.doi.org/10.1109/ap-s/usnc-ursi47032.2022.9887057.

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Malek, Norun Abdul, et Rob Seager. « 3D reconfigurable antenna ». Dans Propagation Conference (LAPC). IEEE, 2010. http://dx.doi.org/10.1109/lapc.2010.5666796.

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Lomakin, K., T. Pavlenko, M. Sippel, G. Gold, T. Weidner, K. Helmreich, M. Ankenbrand et J. Franke. « 3D Printed Helix Antenna ». Dans 12th European Conference on Antennas and Propagation (EuCAP 2018). Institution of Engineering and Technology, 2018. http://dx.doi.org/10.1049/cp.2018.1034.

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Tavzarashvili, Kakhaber, Giorgi Kajaia, Giorgi Ghvedashvili, Tamar Gogua et Nino Tkeshelashvili. « 3D optical nano-antenna ». Dans 2015 XXth IEEE International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED). IEEE, 2015. http://dx.doi.org/10.1109/diped.2015.7324264.

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Arya, Ravi Kumar, Shiyu Zhang, Yiannis Vardaxoglou, Will Whittow et Raj Mittra. « 3D-printed lens antenna ». Dans 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2017. http://dx.doi.org/10.1109/apusncursinrsm.2017.8072046.

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Zavodny, Vadim, et Petr Kopecky. « Antenna for 3D radar demonstrator ». Dans 2015 European Radar Conference (EuRAD). IEEE, 2015. http://dx.doi.org/10.1109/eurad.2015.7346338.

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Zavodny, Vadim, et Petr Kopecky. « Antenna for 3D radar demonstrator ». Dans 2015 European Microwave Conference (EuMC 2015). IEEE, 2015. http://dx.doi.org/10.1109/eumc.2015.7346056.

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Shamsinejad, Souren, et Pedram Mousavi. « 3D folded cubical slot antenna ». Dans 2014 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2014. http://dx.doi.org/10.1109/aps.2014.6904758.

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Mufti, Saad, Alan Tennant et Luke Seed. « 3D electrically small dome antenna ». Dans 2014 Loughborough Antennas & Propagation Conference (LAPC). IEEE, 2014. http://dx.doi.org/10.1109/lapc.2014.6996477.

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Zilio, Pierfrancesco, Mario Malerba, Andrea Toma et Francesco De Angelis. « Slanted 3D Plasmonic Antenna Arrays ». Dans CLEO : QELS_Fundamental Science. Washington, D.C. : OSA, 2015. http://dx.doi.org/10.1364/cleo_qels.2015.ftu2e.3.

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Rapports d'organisations sur le sujet "Antenna stampata in 3D"

1

Kirchhoff, Helmut, et Ziv Reich. Protection of the photosynthetic apparatus during desiccation in resurrection plants. United States Department of Agriculture, février 2014. http://dx.doi.org/10.32747/2014.7699861.bard.

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In this project, we studied the photosynthetic apparatus during dehydration and rehydration of the homoiochlorophyllous resurrection plant Craterostigmapumilum (retains most of the photosynthetic components during desiccation). Resurrection plants have the remarkable capability to withstand desiccation, being able to revive after prolonged severe water deficit in a few days upon rehydration. Homoiochlorophyllous resurrection plants are very efficient in protecting the photosynthetic machinery against damage by reactive oxygen production under drought. The main purpose of this BARD project was to unravel these largely unknown protection strategies for C. pumilum. In detail, the specific objectives were: (1) To determine the distribution and local organization of photosynthetic protein complexes and formation of inverted hexagonal phases within the thylakoid membranes at different dehydration/rehydration states. (2) To determine the 3D structure and characterize the geometry, topology, and mechanics of the thylakoid network at the different states. (3) Generation of molecular models for thylakoids at the different states and study the implications for diffusion within the thylakoid lumen. (4) Characterization of inter-system electron transport, quantum efficiencies, photosystem antenna sizes and distribution, NPQ, and photoinhibition at different hydration states. (5) Measuring the partition of photosynthetic reducing equivalents between the Calvin cycle, photorespiration, and the water-water cycle. At the beginning of the project, we decided to use C. pumilum instead of C. wilmsii because the former species was available from our collaborator Dr. Farrant. In addition to the original two dehydration states (40 relative water content=RWC and 5% RWC), we characterized a third state (15-20%) because some interesting changes occurs at this RWC. Furthermore, it was not possible to detect D1 protein levels by Western blot analysis because antibodies against other higher plants failed to detect D1 in C. pumilum. We developed growth conditions that allow reproducible generation of different dehydration and rehydration states for C. pumilum. Furthermore, advanced spectroscopy and microscopy for C. pumilum were established to obtain a detailed picture of structural and functional changes of the photosynthetic apparatus in different hydrated states. Main findings of our study are: 1. Anthocyan accumulation during desiccation alleviates the light pressure within the leaves (Fig. 1). 2. During desiccation, stomatal closure leads to drastic reductions in CO2 fixation and photorespiration. We could not identify alternative electron sinks as a solution to reduce ROS production. 3. On the supramolecular level, semicrystalline protein arrays were identified in thylakoid membranes in the desiccated state (see Fig. 3). On the electron transport level, a specific series of shut downs occur (summarized in Fig. 2). The main events include: Early shutdown of the ATPase activity, cessation of electron transport between cyt. bf complex and PSI (can reduce ROS formation at PSI); at higher dehydration levels uncoupling of LHCII from PSII and cessation of electron flow from PSII accompanied by crystal formation. The later could severe as a swift PSII reservoir during rehydration. The specific order of events in the course of dehydration and rehydration discovered in this project is indicative for regulated structural transitions specifically realized in resurrection plants. This detailed knowledge can serve as an interesting starting point for rationale genetic engineering of drought-tolerant crops.
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