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5.1 Optical Nanostrip Antenna
Copyright Undertaking This thesis is protected by copyright, with all rights reserved. By reading and using the thesis, the reader understands and agrees to the following terms: 1. The reader will abide by the rules and legal ordinances governing copyright regarding the use of the thesis. 2. The reader will use the thesis for the purpose of research or private study only and not for distribution or further reproduction or any other purpose. 3. The reader agrees to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage. IMPORTANT If you have reasons to believe that any materials in this thesis are deemed not suitable to be distributed in this form, or a copyright owner having difficulty with the material being included in our database, please contact [email protected] providing details. The Library will look into your claim and consider taking remedial action upon receipt of the written requests. Pao Yue-kong Library, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong http://www.lib.polyu.edu.hk INVENSTIGATION OF SOLAR ELECTRIC SYSTEMS BASED ON NANO RECTENNA WANG JIAJIE, IVAN Ph.D The Hong Kong Polytechnic University 2014 I II The Hong Kong Polytechnic University Department of Building Services Engineering Investigation of Solar Electric Systems Based on Nano Rectenna WANG Jiajie, Ivan A thesis submitted in partial fulfillment of the requirements for the Degree of Doctor of Philosophy September 2013 III IV CERTIFICATE OF ORIGINALITY I hereby declare that this thesis is my own work and that, to the best of my knowledge and belief, it produces no material previously published or written nor material which has been accepted for the award of any other degree or diploma, except where due acknowledgement has been made in the text. -
"Eggbeater"Antenna Vhf/Uhf ~ Part 1
"EGGBEATER"ANTENNA VHF/UHF ~ PART 1 ON6WG / F5VIF For the enthusiastic listeners or the licensed amateur station wishing to experiment with satellite transmissions without investing a large sum of money in rotators and tracking systems, here is a very competitive antenna. It will appeal to those with no space for large arrays, or for those who simply wish to experiment with circular polarization for terrestrial transmissions. Introduction This antenna was conceived mainly for high-speed digital transmission via satellite. Another reason was the need for a compact system due to the local environment of my station (mountainous region with high hills and obstacles too close to my station, no space to safely place rotative YAGI antennas). If the horizon is unreachable for RF signals , that leaves only the sky above us. To use the high-speed digital satellites, the level of signal reaching the TNC must be high enough to correctly decode the packets. For example, I mainly use an AEA/PK-96 TNC which requires at least 200 millivolts p-p at the input. To have this level when receiving 9600 Bd packets, there must be at least an S-3 showing on the S-Meter of my receiver. Design The antenna is made of two full waves loops , mounted at right angles to each other. Then coupled together, 90 degrees out of phase over a horizontal circular reflector. With this configuration the antenna is omni directional and circularly polarized. Changing the feeder connection from one loop to the other loop will effectively change the polarization between RHCP and LHCP. -
Reconfigurable Plasma Antenna Array by Using Fluorescent Tube for Wi-Fi Application
RADIOENGINEERING, VOL. 25, NO. 2, JUNE 2016 275 Reconfigurable Plasma Antenna Array by Using Fluorescent Tube for Wi-Fi Application Hajar JA’AFAR1, Mohd Tarmizi ALI 2, Ahmad Nazri DAGANG3, Idnin Pasya IBRAHIM2, Nur Aina HALILI2, Hanisah MOHD ZALI2 1Faculty of Electrical Engineering, Universiti Teknologi MARA (Terengganu), Sura Hujung 23000 Dungun, Malaysia 2Faculty of Electrical Engineering, Universiti Teknologi MARA (UiTM), 40450 Shah Alam, Selangor, Malaysia 3 School of Ocean Engineering, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia [email protected] Manuscript received March 19, 2016 Abstract. This paper presents a new design of reconfigura- generated by UV laser irradiation, or by laser initiated pre- ble plasma antenna array using commercial fluorescent ionization followed by high voltage break down to form tube. A round shape reconfigurable plasma antenna array the main conducting channel or by simply using commer- is proposed to collimate beam radiated by an omnidirec- cial fluorescence tube to serve as reflector, or by much tional antenna (monopole antenna) operating at 2.4 GHz more expensive electron beam [2]. There were also exotic in particular direction. The antenna design consists of methods like explosion generating plasma antenna for a monopole antenna located at the center of a circular alu- fusion research. The plasma will be present when electron minum ground. The monopole antenna is surrounded by and nucleus that form the atom is no longer able to stay a cylindrical shell of conducting plasma. The plasma shield together due to high kinetic energy. It happens due to the consists of 12 commercial fluorescent tubes aligned in electrons are stripped out from the atoms. -
Performance and Radiation Patterns of a Reconfigurable Plasma Corner-Reflector Antenna Mohd Taufik Jusoh Tajudin, Mohamed Himdi, Franck Colombel, Olivier Lafond
Performance and Radiation Patterns of A Reconfigurable Plasma Corner-Reflector Antenna Mohd Taufik Jusoh Tajudin, Mohamed Himdi, Franck Colombel, Olivier Lafond To cite this version: Mohd Taufik Jusoh Tajudin, Mohamed Himdi, Franck Colombel, Olivier Lafond. Performance and Radiation Patterns of A Reconfigurable Plasma Corner-Reflector Antenna. IEEE Antennas and Wireless Propagation Letters, Institute of Electrical and Electronics Engineers, 2013, pp.1. 10.1109/LAWP.2013.2281221. hal-00862667 HAL Id: hal-00862667 https://hal-univ-rennes1.archives-ouvertes.fr/hal-00862667 Submitted on 17 Sep 2013 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. 1 Performance and Radiation Patterns of A Reconfigurable Plasma Corner-Reflector Antenna Mohd Taufik Jusoh, Olivier Lafond, Franck Colombel, and Mohamed Himdi [9] and reactively controlled CRA in [10] were proposed to Abstract—A novel reconfigurable plasma corner reflector work at 2.4GHz. A mechanical approach of achieving variable antenna is proposed to better collimate the energy in forward beamwidth by changing the included angle of CRA was direction operating at 2.4GHz. Implementation of a low cost proposed in [11]. The design was simulated and measured plasma element permits beam shape to be changed electrically. -
Analysis of Crossed Dipole to Obtain Circular Polarization Applying Characteristic Modes Techniques
Analysis of crossed dipole to obtain circular polarization applying Characteristic Modes techniques Juan Pablo Ciafardini (1), Eva Antonino Daviu (2), Marta Cabedo Fabrés (2), Nora Mohamed Mohamed-Hicho (2), José Alberto Bava (1), Miguel Ferrando Bataller (2). (1) Dpto. de Electrotecnia. Facultad de Ingeniería, Universidad Nacional de La Plata. Calle 48 y 116 - La Plata (1900), Argentina. [email protected] (2) Instituto de Telecomunicaciones y Aplicaciones Multimedia. Edificio 8G. Planta 4ª, acceso D. Universidad Politécnica Valencia. Camino de Vera, s/n46022 Valencia. España. [email protected] Abstract— The crossed dipole is a common type of antenna developed to achieve wider bandwidth impedance compared that is used to generate circularly polarized radiation in a wide to the original design. In 1961 a new type of crossed dipole frequency range. This antenna was originally developed in the antenna, which used a single feed, was developed for 1930s and today is used in many wireless communication circular polarization radiation [5], Bolster demonstrated systems, including broadcast services, satellite theoretically and experimentally that single-feed crossed communications, mobile communications, global navigation systems satellite system (GNSS), radio frequency identification dipoles connected in parallel if the lengths of the dipoles (RFID), wireless local area networks (WLANs) and global were such that the real parts of their input admittances were interoperability for microwave access (WiMAX). equal and the phase angles of their input admittances This paper shows that it is possible to obtain circular differed by 90º. Based on these conditions, numerous polarization with two cross dipoles with different lengths and single-feed circularly polarized crossed dipole antennas connected in parallel by applying the Theory of Characteristic have been designed [5] - [25]. -
2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting
2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting Final Program 7–12 July 2019 Hilton Atlanta Atlanta, Georgia, U.S.A. Conference at a Glance Saturday, July 6 14:00-16:00 Strategic Planning Committee 16:15-17:15 AP-S Meetings Committee 17:15-18:15 JMC Meeting (Closed Session) 18:15-21:30 JMC Meeting, Dinner and Presentations 19:15-21:15 IEEE AP-S Constitution and Bylaws Committee Meeting & Dinner Sunday, July 7 08:00-10:00 Past Presidents’ Breakfast 10:00-18:00 AdCom Meeting 19:30-22:00 Welcome Dessert Reception at the Georgia Aquarium Monday, July 8 07:00-08:00 Amateur Radio Operators Breakfast 08:00-11:40 Technical Sessions 09:00-18:00 Technical Tour - “An Engineer’s Eye View” of the Mercedes Benz Stadium 12:00-13:20 Transactions on Antennas and Propagation Editorial Board Lunch Meeting 13:20-17:00 Technical Sessions 17:00-18:00 URSI Commission A Business Meeting 17:00-18:00 URSI Commission B Business Meeting 17:00-18:00 URSI Commissions C/E (combined) Business Meeting Tuesday, July 9 07:00-08:00 AP Magazine Staff Meeting 07:00-08:00 APS 2020 Committee Meeting 07:00-08:00 Industrial Initiatives 07:00-08:00 Membership Committee Meeting 07:00-08:00 Student Design Contest (Set-Up - Closed to Others) 07:00-08:00 Technical Committee on Antenna Measurement 08:00-11:40 Student Paper Competition 08:00-11:40 Technical Sessions 08:00-09:30 Student Design Contest (Demo for Judges - Closed to Others) 08:30-14:00 Standards Committee Meeting 09:30-12:00 Student Design Contest (Demo for Public) -
AU0019429 PLASMA ANTENNAS: DYNAMICALLY CONFIGURABLE ANTENNAS for COMMUNICATIONS Gerard Borg, David Miljak*, Jeffrey Harris and N
AU0019429 PLASMA ANTENNAS: DYNAMICALLY CONFIGURABLE ANTENNAS FOR COMMUNICATIONS Gerard Borg, David Miljak*, Jeffrey Harris and Noel Martin* Plasma Research Laboratory "'• Research School of Physical Sciences ".v Australian National University Canberra ACT 0200 Australia Wills Plasma Physics Department School of Physics, University of Sydney Sydney, New South Wales, 2006 Australia * Defence Science and Technology Organisation P.O. Box 1500, Salisbury, South Australia , 5108 Australia In recent years, the rapid growth in both communications and radar systems has led to a concomitant growth in the possible applications and requirements of antennas. These new requirements include compactness and conformality, rapid reconfigurability for directionality and frequency agility. For military applications, antennas should also allow low absolute or out-of-band radar cross-section and facilitate low probability of intercept communications. Investigations have recently begun worldwide on the use of ionised gases or plasmas as the conducting medium in antennas that could satisfy these requirements. Such plasma antennas may even offer a viable alternative to metal in existing applications when overall technical requirements are considered. A recent patent for ground penetrating radar claims the invention of a plasma antenna for the transmission of pulses shorter than 100 ns in which it is claimed that current ringing is avoided and signal processing simplified compared with a metal antenna. A recent US ONR tender has been issued for the design and construction of a compact and rapidly reconfigurable antenna for dynamic signal reception over the frequency range 1 - 45 GHz based on plasma antennas. Recent basic physics experiments at ANU have demonstrated that plasma antennas can attain adequate efficiency, predictable radiation patterns and low base-band noise for HF and VHF communications. -
Plasma Antennas: Survey of Techniques and the Current State of the Art
NPS-CRC-03-001 MONTEREY, CALIFORNIA Plasma Antennas: Survey of Techniques and the Current State of the Art by D. C. Jenn September 29, 2003 Approved for public release; distribution is unlimited. Prepared for: SPAWAR PMW 189 San Diego, CA REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188 Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instruction, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188) Washington DC 20503. 1. AGENCY USE ONLY (Leave 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED blank) September 29, 2003 Technical Report (July 2003 to September 2003) 4. TITLE AND SUBTITLE: 5. FUNDING NUMBERS Plasma Antennas: Survey of Techniques and Current State of the Art 6. AUTHOR(S) David C. Jenn 7. PERFORMING ORGANIZATION NAME(S) AND 8. PERFORMING ADDRESS(ES) ORGANIZATION REPORT Naval Postgraduate School NUMBER Monterey, CA 93943-5000 NPS-CRC-03-001 9. SPONSORING / MONITORING AGENCY NAME(S) AND 10. SPONSORING / MONITORING ADDRESS(ES) AGENCY REPORT NUMBER SPAWAR PMW 189 11. SUPPLEMENTARY NOTES The views expressed in this thesis are those of the author and do not reflect the official policy or position of the Department of Defense or the U.S. -
Design and Fabrication of Plasma Array Antenna with Beam Forming
http://jecei.srttu.edu Journal of Electrical and Computer Engineering Innovations JECEI, Vol. 5, No. 1, 2017 SRTTU Regular Paper Design and Fabrication of Plasma Array Antenna with Beam Forming Fatemeh Sadat Mohseni Armaki1,* and Seyyed Amirhossein Mohseni Armaki2 1Iran University of Science and Technology, Tehran, Iran. 2University of Tehran, Tehran, Iran. *Corresponding Author’s Information: [email protected] ARTICLE INFO ABSTRACT In this paper, the design and implementation of plasma antenna array ARTICLE HISTORY: with beam forming is discussed. The structure consists of a circular array Received 16 July 2017 of plasma tube enclosed in a unipolar UHF band monopole antenna. Beam Revised 03 September 2017 forming is possible by stimulated plasma tubes. The combination of the Accepted 04 September 2017 above antenna with plasma excitation controller makes a beam forming smart antenna. An experimental model in UHF band is fabricated that KEYWORDS: shows a good agreement between the simulated and measured results. Plasma array antenna Smart antenna Beam forming 1. INTRODUCTION voltages. When the antenna is off, the plasma is non- conducting and therefore the tube is transparent. Ionized gas was proposed as the fourth state of matter When the plasma is on, it exhibits a high conductivity. in 1879 by the English physicist, Sir William Crookes. The main advantage in using plasma antenna instead Plasma is a collection of ionized positive ions and free of metallic elements is that they allow an electrical moving electrons. Ionized gases are good conductors rather than mechanical control. for electricity [1]. Plasma can be generated by electron Usually a commercial tube, designed for lighting impact ionization, heating the gas, photo-ionization or purposes, has been used to create the plasma column. -
Types of Microwave Antenna and Its Applications
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 03 | Mar-2018 www.irjet.net p-ISSN: 2395-0072 Types of Microwave Antenna and Its Applications Lalith Dupathi1, Manasa Gadiyaram2 1,2 K.J Somaiya college of engineering, Mumbai ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract: This paper represents the classification of E Directive gain of antenna microwave antenna and its applications. Microwave antenna is a type of antenna which is operated at microwave frequency The gain is also known as the directive gain of antenna. Gain and they are widely used in many practical applications. A takes into account the efficiency as well as the directional microwave antenna is a major system component that allows capabilities of the antenna. Gain is the product of efficiency a microwave system to transmit and receive data between and directivity. An antenna which has larger aperture will microwave sites. Microwave have wavelengths ranging from 1 have more gain. meter to 1 millimeter. Microwaves are mainly used in satellite communication. F Antenna beam area Keywords: Microwave Antenna, Classification of It is denoted by ΩA. It is the solid angle through which all of antenna the radiated power by an antenna would flow if power maintains its maximum value over ΩA and zero elsewhere. It Introduction is also defined as the angle subtended by half power point in the main lobe in two principle planes. A Microwave Antenna is a physical transmission device used to broadcast microwave transmissions between two or more G Antenna lobes locations. Mainly used to convert electronic signals to electromagnetic waves. -
Crossed Dipole Antennas: a Review
See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/282776048 Crossed Dipole Antennas: A review Article in IEEE Antennas and Propagation Magazine · October 2015 DOI: 10.1109/MAP.2015.2470680 CITATIONS READS 32 7,482 3 authors: Son Xuat Ta Ikmo Park VNU University of Science Ajou University 78 PUBLICATIONS 642 CITATIONS 187 PUBLICATIONS 2,123 CITATIONS SEE PROFILE SEE PROFILE R.W. Ziolkowski The University of Arizona 562 PUBLICATIONS 12,913 CITATIONS SEE PROFILE Some of the authors of this publication are also working on these related projects: Artificial Metamaterials View project Metasurface-Inspired Antennas View project All content following this page was uploaded by Son Xuat Ta on 16 November 2015. The user has requested enhancement of the downloaded file. Son Xuat Ta, Ikmo Park, and Richard W. Ziolkowski Crossed Dipole Antennas A review. rossed dipole antennas have been THE HISTORY OF CROSSED widely developed for current and DIPOLE ANTENNAS future wireless communication sys- The crossed dipole is a common type of mod- tems. They can generate isotropic, ern antenna with an radio frequency (RF)- Comnidirectional, dual-polarized (DP), and to millimeter-wave frequency range. The circularly polarized (CP) radiation. More- crossed dipole antenna has a fairly rich and over, by incorporating a variety of primary interesting history that started in the 1930s. radiation elements, they are suitable for The first crossed dipole antenna was devel- single-band, multiband, and wideband oper- oped under the name “turnstile antenna” ations. This article presents a review of the by Brown [1]. In the 1940s, “superturnstile” designs, characteristics, and applications antennas [2]–[4] were developed for a broader of crossed dipole antennas along with the impedance bandwidth in comparison with recent developments of single-feed CP con- the original design. -
Design of a Transmitarray Antenna Using 4 Layers of Double Square Ring Elements
Progress In Electromagnetics Research Letters, Vol. 94, 141–149, 2020 Design of a Transmitarray Antenna Using 4 Layers of Double Square Ring Elements Xian Wei Chua1, 2, *,Tse-TongChia3, and Kerrell Boon Khim Chia3 Abstract—Conventional dielectric lenses rely on the accumulation of phase delay during wave propagation to produce a desired wavefront. By considering the required phase delay at each lens position, an ‘equivalent’ transmitarray antenna can be obtained. Despite a lack of curvature as in conventional lenses, the phase delay in the transmitarray antenna is achieved via a periodic arrangement of unit cell elements to bend the incident waves in the desired directions. This paper presents the design and characterization of a 4-layer transmitarray antenna consisting of double square ring elements. The gap between the double square rings is varied as a fixed proportion of their dimensions, while keeping the widths constant. The transmitarray element can achieve a transmission phase range of 235◦ with a loss of less than 3 dB. The performance of the transmitarray antenna is explicitly compared to that of a convex dielectric lens, both of which are operating at 8 GHz. 1. INTRODUCTION Transmitarray antennae consist of planar, periodic arrays of printed circuit elements in sub-wavelength lattices. They have many advantages over conventional dielectric lenses for applications in satellite communication, automotive radar, and imaging systems:high-gain, lightweight, cheap, and small [1–7]. While zoning can reduce the weight of conventional lenses, it degrades system performance with reduced bandwidth and increased sidelobe levels [8]. Transmitarray antennae are also easier to fabricate with advancements in printed circuit board technologies [9, 10], while conventional lenses require expensive machining or molding processes [11].