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Dissertations / Theses on the topic 'LEAKY WAVEGUIDE'

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Published: 11 September 2023

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1

Hou, Xiaobo Rosen Warren A. Daryoush Afshin S. "A leaky waveguide all-optical analog-to-digital converter /." Philadelphia, Pa. : Drexel University, 2004. http://dspace.library.drexel.edu/handle/1860/437.

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2

Pasik, Michael Francis. "An asymptotic analysis of a leaky parallel-plate waveguide." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186163.

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An asymptotic analysis of a leaky parallel-plate waveguide is presented. The walls of the waveguide consist of bonded wire meshes which are modeled using a sheet impedance boundary condition. The fields are excited by magnetic line sources exterior to the waveguide. The wire meshes allow for coupling between the interior of the waveguide and the exterior region. In addition, each mesh can support a surface wave. We employ Fourier transform techniques to derive an integral representation for the magnetic field. We present various interpretations of the integral representation and evaluate the i
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3

Smith, Nathan James. "Convergent beam waveguide studies of liquid crystals." Thesis, University of Exeter, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366612.

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4

Jahagirdar, Dhananjay R. "Non-leaky conductor-backed coplanar waveguide-fed microstrip patch antennas." Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241874.

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5

Gneiting, Scott Alexander. "Improved Leaky-Mode Waveguide Spatial Light Modulators for Three Dimensional Displays." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6561.

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This thesis improves on the design of the leaky-mode spatial light modulator, LMW-SLM, presented by Dr. Smalley[1]. Improvements include: input coupling gratings, a pulsed laser input, output coupling gratings, and a 3D printed adjustable module for the stabilization of critical alignments. First, input coupling gratings reduce the cost of the LMW-SLM from $500 to around $2, a drop in cost of over two orders of magnitude. This enables multiple modulators to be used in a single display and allows for an inexpensive modular design to be created. Second, a pulsed laser input allows for image crea
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6

Stevens, Robin A. "The optical characterisation of liquid crystals using a half leaky waveguide geometry." Thesis, University of Exeter, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307290.

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7

Allayarov, Izzatjon [Verfasser], and Thomas [Akademischer Betreuer] Weiss. "Theory of leaky mode propagation in optical waveguide geometries / Izzatjon Allayarov ; Betreuer: Thomas Weiss." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2020. http://d-nb.info/1217253513/34.

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8

Qaderi, Kamran. "Waveguide-Based Spatial Light Modulators for Use in Holographic Video Displays." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7054.

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Film display holograms typically diffract light over a wide enough view-angle to be viewed, directly, without intervening optics. However, all holographic video displays must use optics beyond the hologram surface to overcome the challenges of small display extent and low diffraction angle by using some form of demagnification and derotation. We report a leaky mode waveguide spatial light modulator (SLM) with sufficiently high angular diffraction to obviate the need for demagnification in scanned aperture systems. This was achieved by performing a number of experiments to determine the depth o
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9

Cox, Gavin J. "Techniques for pattern control of a dielectric rod antenna suitable for use in mobile communications." Thesis, Loughborough University, 2002. https://dspace.lboro.ac.uk/2134/12693.

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This thesis describes the development of antennas suitable for mobile coinmunication systems based on a dielectric rod antenna fed from circular waveguide. Pattern control of the antenna is implemented using a combination of Frequency Selective Surface (FSS) elements and metallic endcaps placed on the antenna Both linear and circular polarised feeds have been made for these antennas to ensure they are suitable for a wide range of applications. The suitability of the dominant and next, higher order, waveguide mode were investigated and conclusions drawn as to their suitability for this type of
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10

Engelbrecht, Julia Maria. "Ein Beitrag zur funkgestützten Indoor-Positionierung auf der Basis von Leckwellenleitern in Fahrgastzellen." Doctoral thesis, Technische Universität Dresden, 2016. https://tud.qucosa.de/id/qucosa%3A31900.

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In dieser Arbeit wird der Einsatz von Leckwellenleiter (engl. Leaky Coaxial Cable, LCX) zur funkgestützten Indoor-Positionierung in Fahrgastzellen untersucht. Mit Hilfe eines erstellten Vorgehensmodells werden zwei unterschiedliche LCX-Prototypen speziell für den Ortungseinsatz entwickelt. Hierbei wird die elektromagnetische Feldberechnung verwendet, um sowohl Leckwellenleiterstrukturen als auch deren Einsatz in einer Fahrgastzelle zu bewerten. Nach Fertigung beider Leckwellenleiter erfolgt eine messtechnische Validierung in einer vordefinierten Fahrgastzellenumgebung. Der Einsatz dieser Proto
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11

茂幸, 西村, та Shigeyuki Nishimura. "遮断TEおよびTMモードを用いた右手/左手系複合導波管の伝送・放射特性". Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13097319/?lang=0, 2018. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13097319/?lang=0.

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本論文では，遮断周波数以下のTE・TMモードを利用した右手/左手系複合円筒導波管および方形導波管を提案する．この提案したCRLH導波管にスリットまたはスロットを設けることで構成された導波管型漏洩波アンテナの放射特性について述べている．最後に，CRLH導波管を試作し解析結果と実験結果の比較を行うことで，CRLH方形・円筒導波管の構成法の有用性を明らかにする．<br>This paper proposes a composite right/left-handed cylindrical and rectangular waveguides using the cutoff TE and TM modes. The CRLH waveguides can be successfully applied to radiation characteristics of leaky-wave antenna by setting slits or slots. Finally, usefulness of the proposed CRLH waveguides is verified by comparison between the calculated and the measured values.<br>博士(工学)<br>Doctor of Philosophy in Engin
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12

Mikulin, Dominic Josef. "Characterising liquid crystal cells by fitting half-leaky guided mode data using genetic algorithms." Thesis, University of Exeter, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361320.

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13

McSweeney, Matthew J. P. "The optical characterisation of liquid crystal structures." Thesis, University of Exeter, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337747.

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14

Gallezot, Matthieu. "Simulation numérique du contrôle non-destructif des guides d’ondes enfouis." Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0040/document.

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De nombreux éléments de structures de génie civil sont élancés et partiellement enfouis dans un milieu solide. Les ondes guidées sont souvent utilisées pour le contrôle non destructif (CND) de ces éléments. Ces derniers sont alors considérés comme des guides d’ondes ouverts, dans lesquels la plupart des ondes sont atténuées par des fuites dans le milieu environnant. D’autre part le problème est non borné, ce qui le rend difficile à appréhender sur le plan numérique. La combinaison d’une approche par éléments finis semi-analytique (SAFE) et de la méthode des couches parfaitement adaptées (PML)
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15

Zeng, Guan-Ling, and 曾冠菱. "Dual-Polarized Slotted Conductor-Backed Coplanar Waveguide Leaky-Wave Antenna." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/85695786639881797377.

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碩士<br>國立交通大學<br>電信工程研究所<br>104<br>Conductor-backed coplanar waveguide (CBCPW) propagates electromagnetic waves via dominant modes (coplanar waveguide mode), and excites leaky wave which propagates toward both sides despite the value of the frequency. In general, there are two applications based on this structure: first is to use such property to design the antenna; the other is to suppress the leaky wave through some methods in order to decrease the unnecessary couplings and crosstalk. Implementing the full wave analysis (Spectral Domain Approach) on the CBCPW structure, we can discover that t
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16

SRIVASTAVA, KISLAY. "DESIGN AND ANALYSIS OF DUAL SHAPE CORE LARGE-MODE-AREA LEAKY CHANNEL WAVEGUIDE FOR HIGH POWER." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14454.

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We propose a leaky channel waveguide for large-mode-area extended single-mode operation. The proposed structure is characterized by specially designed guiding core and multilayer cladding. Specially designed cladding enables all the supported modes except fundamental modes leaky. Leakage loss of the higher-order mode which is key factor of single-mode operation is calculated by solving the profile by effective index method in conjunction with transfer matrix method. Dispersive cladding of the proposed design makes this design enable to show extended single mode operation in the entire wa
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17

SINGH, SANDEEP. "DESIGN AND ANALYSIS OF TRENCH ASSISTED LARGE MODE AREA LEAKY CHANNEL WAVEGUIDE FOR HIGH-POWER APPLICATIONS." Thesis, 2013. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15673.

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Integrated-optic waveguide lasers have drawn considerable attention for their compactness and possibility of device integration. A lot of interest has been shown to increase the mode area of waveguide for applications in optical communication and high-power laser and amplifier. For waveguide laser and amplifier applications, it is preferable to use a waveguide that supports only one mode to avoid instability arising from intermodal dispersion and mode competition. A conventional single-mode waveguide has a small guiding core. The tight light confinement in such a waveguide can reduce th
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18

KHAN, MOHD IRFAN. "EFFECTS OF LEAKY WAVEGUIDE ON THE CONTROL PERFORMANCE OF COMMUNICATION BASED TRAIN CONTROL SYSTEM BASED ON PATH-LOSS MODEL." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14996.

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In urban rail transit, systems using communication based train control (CBTC), it uses high accuracy of train locating, realizes a continuous automatic train control system. High resolution of locating the train permits the high line capacity and fewer Infrastructures is required than Track circuit based system therefore all over the world countries have more concerned about this technology. DCS system plays an important role in the information interaction between ground equipment and vehicle equipment in CBTC. DCS is WLAN which is short range radio networks based on IEEE 802.11, comple
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19

Hsiao, Cherng Chyi, and 蕭承麒. "A Beam Adjustable Leaky-Wave Antenna Using a Moveable Dielectric Slab inside a Waveguide－Theoretical Analysis and Experimental Studies." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/55706359367069234447.

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博士<br>國立交通大學<br>電信工程系所<br>93<br>In this dissertation, we presented a beam adjustable antenna made up of a slitted waveguide and a dielectric slab. In order to steer the radiation main-beam angle, we changed the phase constant of the waveguide mode by inserting a dielectric slab to perturb its field distribution. The direction of radiation main-beam can be steered by dynamically changing the position of the dielectric slab. In the theoretical analysis, the dispersion relation including the phase and attenuation constants, were determined by solving the transverse resonance equation. An agre
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20

Lu, Jeng-Hau, and 呂政皓. "Techniques for Side Lobe Suppression and Gain Enhancement of a Half Mode Substrate Integrated Waveguide Leaky-Wave Antenna ANTENNA." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/53864171228319744956.

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碩士<br>國立交通大學<br>電信工程研究所<br>99<br>This thesis gives a study on two techniques to suppress the side lobes and enhance the gain of a half mode substrate integrated waveguide leak wave antenna, respectively. In this thesis, we are aware of two phenomenon that may spoil the performance of a leaky wave antenna: 1. Due to the traveling wave nature of the leaky wave antennas, the remaining power at the end of the leaky wave antenna should always be carefully guided and terminated or the reflected wave will be excited with the corresponding back lobes that may spoil the radiation pattern. 2. Even if o
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21

Chuang, Shih-Keng, and 莊士賡. "Design of Dual Band CRLH Substrate Integrated Waveguide Leaky Wave Antenna And The Performance Verification of Embedded End-Fire Antennas in LTCC for 60GHz." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/41083194434655692903.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>102<br>This thesis is divided into two parts, the first part is a design of CRLH dual band leaky wave antenna by substrate integrated waveguide (SIW). Energy is radiated from the top slots of the SIW. By adding transmission line differs from SIW structure on both sides of SIW, the dual band design can be more flexible and the size of antenna can be reduced. VIAs are added near the slot for adjusting the operating frequency. Dual slots on the top of SIW for enhancing the gain of antenna is also proposed in this thesis. Design theory, antenna structure, simulation an
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22

Sheng, Meng-Huei, and 盛夢徽. "Rigorous Leaky-Mode Analysis of Antiresonant Reflecting Optical Waveguides." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/84110131372336570151.

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博士<br>國立中山大學<br>光電工程研究所<br>93<br>We have developed a rigorous leaky-mode analysis on the antiresonant reflecting optical waveguides (ARROW’s) using a so-called “coupled electric (CE) coupled magnetic (CH) field method.” Radiation loss characteristics and the field distribution of the ARROW are analyzed in detail. Meanwhile, both the refractive indices and the thickness dependence for the isolation and distinction of modes are also investigated in this thesis. From the CE–CH method, the associated complex symmetric tridiagonal matrices are derived to solve the modal solutions via the eigenval
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23

Chuang, Ying-Chieh. "Full-Vectorial Finite Difference Mode Solver for Leaky Optical Waveguides." 2004. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2307200414220900.

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24

Chuang, Ying-Chieh, and 莊英傑. "Full-Vectorial Finite Difference Mode Solver for Leaky Optical Waveguides." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/71427437027268826890.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>92<br>Abstract Due to its simplicity and efficiency, a full-vectorial mode solver based on a finite difference scheme is applied to investigate the propagation characteristics of optical waveguides. Since uniform meshes are used in the numerical implementation, it is very easy to divide the computational window of any arbitrary cross-sectional geometries of the waveguides. An index averaging technique is employed to deal with curved dielectric interfaces for stabilizing the numerical calculation and accelerating convergence. In addition, for solving leaky-mode probl
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25

Liu, Jun Yeh, and 劉潤業. "Effect of Finite Metalization Thickness on Leaky Waves of Coplanar Waveguides." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/50518941931628968636.

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碩士<br>國立中山大學<br>電機工程研究所<br>82<br>In this study, the effects of finite metalization thickness on dispersion characteristics and leaky waves of coplanar waveguides are presented and discussed in detail. We first derive the spectral domain integral equations by using network analytical method, an extension of spectral domain approach, to take metalization thickness into account. By applying the Galerkin's procedure to these integral equations, we can solve the complex propagation constant of t
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26

Lin, Yi-Zhen, and 林宜貞. "A new method of analyzing the light transmission in leaky and absorbing waveguides." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/84721150681189187295.

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碩士<br>國立清華大學<br>電機工程學系<br>85<br>A simple, generalized method of analyzing the light transmission in leaky and absorbing planar waveguides is proposed in this thesis. We use a straightforward and intuitive manner to derive the analytical expression of the power transmission discussed. By utilizing the well-known law for the partial reflection of a plane wave at an interface and the Goos-Hanchen shift happened for the case of total internal reflection, the associated
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27

BACCARELLI, Paolo. "Studio di fenomeni propagativi e radiativi in guide anisotrope e periodiche stampate." Doctoral thesis, 2000. http://hdl.handle.net/11573/394517.

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