The antenna can comprise an enclosed composition capable of forming plasma operable as an antenna. Optionally, an energy modifying medium to reconfigure the waveguide such that electromagnetic waves of various wavelengths or speeds can be propagated directionally along the. The functional antenna in term of return loss has return loss. Plasma antenna vswr and cosite and parasitic interference.
Industrial plasma antennas1 igor alexeff, university of tennessee this presentation summarizes an extensive program on plasma antennas. This study summarizes the basic theory behind the operation of plasma antennas based on a survey of patents and technical publications. Aceit conference proceeding 2016 comparative study of. New radio antenna made of star material military could use plasma devices that could better conceal signals. The experiments described in this work were performed with the aim of introducing a new plasma antenna that was excited by a 520 khz alternating current ac power supply, where the antenna was transformed into a ushape. Perfomance analysis of the loopshaped plasma antenna under. Alexeff amplitude anderson applications beam beamwidth cavity resonances chapter. Hardwired antennas can be detected by their shadows and reflections in the rf bands. Published on apr 30, 20 a plasma antenna designed by dr.
The plasma is rapidly created and vanished by applying proper dc voltages. In order to validate the correctness of this method, we simulate the process of. Plasma antennas are just as effective as metal antennas. In this study, designing procedure of a monopole plasma antenna excited by microwave surface waves was investigated. Plasma antennasplasma antennas igor alexeff and ted anderson university of tennessee haleakala research and development inc.
This presentation summarizes an extensive program on plasma antennas. Here, plasma release tubes are utilized as the reception apparatus components. They have found that plasma antennas are just as effective as metal antennas. Igor alexeff, ted anderson, and et al, experimental and theoretical results with plasma antenna, ieee trans. The scattering microwave radiation pattern is calculated for the vertical and horizontal polarizations of the radiation incident on the plasma array. When deenergized, the plasma antenna reverts to a dielectric tube that has a. In various configurations, the plasma device has a plasma in which the temperature, resistance, pressure, andor collision frequency are at a. In this paper, a new plasma antenna of beamforming is investigated based upon the interaction of plasma elements due to the electromagnetic wave. The study reveals the advantages of a plasma antenna over the conventional antenna in the sense that different antennas can be formed by tuning the operating parameters. Pradeep give a summary of an extensive research program on plasma antennas. The radiation characteristic of plasma antenna is investigated by using the finitedifference timedomain fdtd approach in this paper. A kind of wideband plasma monopole antenna is proposed, such as circular plasma monopole antenna based on circular monopole theory.
The impedance and radiation characteristics of this antenna are simulated. The present invention is drawn to an antenna having a reconfigurable length, and a method of reconfiguring an antenna. Pdf potentiality and performance of plasma antenna made from. Proceedings of the 20 international symposium on electromagnetic theory. Alexeff and anderson and 12 anderson and alexeff 3 have done theory, experiments, and have built prototype plasma antennas. Alexeff and anderson and 12 anderson and alexeff 3 have done theory, experiments, and have built prototype plasma. Pdf several experiments on plasma antennas are investigated till date. Anderson 4 wrote a comprehensive book on plasma antennas. Sakai 5 et al have shown that a plasma antenna is a type of metamaterial. Plasma or ionized volume, simply replaces a solid conductors.
This prototype plasma antenna is stealthy, versatile, and jamresistant. And the iterative equations of maxwell equation are derived. Experimental and theoretical results with plasma antennas. Phase shifting plasma electromagnetic waveguides and plasma electromagnetic coaxial waveguides, as well as plasma waveguide horn antennas, each of which can be reconfigurable, durable, stealth, and flexible are disclosed. The disadvantage is that the plasma antennas require energy to be ionized. M ethods of exciting and confining plasmas are discussed, and the current state of the art in. The possibility of applying a cylindrical isotropic collisionless plasma column with a thin dielectric shell as an antenna of strictly axial radiation is investigated. The plasma antenna is comprised of a an enclosed chamber. Stealthy, versatile, and jam resistant antennas made of gas. Design and fabrication of plasma array antenna with beam forming. The plasma device includes devices with a plasma that is responsive to electromagnetic radiation andor electrical signals. When the antenna is off, the plasma is nonconducting and therefore the tube is transparent.
It is assumed that the phase velocity of radiated waves approaches the velocity of light and the radiated wavelength substantially exceeds the radius of the antenna. Plasma antenna, plasma frequency, ionized gas, metal antenna. New radio antenna made of star material technology. In addition, they can transmit, receive and reflect lower frequency signals while being transparent to higher frequency signals. A plasma antenna can be used for both transmission and reception. Plasma antennas driven by 520 khz ac power supply jiansen zhao, yuli chen, yang sun, huafeng wu, yue liu, and qiumeng yuan citation. Artech house antennas and propagation library, 2011. The present paper is a work on fluorescent tube performing the function of a monopole plasma antenna.
The reflectarray reflection coefficient phase variation is achieved by varying the plasma frequency. A plasma array with a controlled pattern is created with the help of a discharge creeping over a dielectric surface. Plasma antenna employs ionized gas enclosed in a tube as the conducting element of an antenna. Radiation patterns of azimuthally symmetric and azimuthally. Research on plasma monopole antenna and its wideband. A plasma antenna is a type of radio pdftk input output antenna currently in development in which plasma is used instead of the metal elements of a traditional antenna.
This prototype plasma antenna is stealthy, versatile, and. Collaboration a method and calculation have been developed to protect space based antennas using plasma fre. Theodore anderson is demonstrated by igor alexeff and dr. Theory, measurements, and prototypes of plasma antennas. Additionally, unless they are hardened against it, extreme rf energy, as might be generated by an emp or by a highlydirectional attacking antenna, can damage circuits connected to the receiving antenna. Plasma antennas refer to a wide variety of antenna concepts that incorporate some use of an ionized medium. Design, simulation and implementation of a preionized. In the experiments the supply frequency varies from 25hz to 200hz. Plasma antennas are radio recurrence reception apparatuses that utilize plasma as the controlling medium for electromagnetic radiation.
We have demonstrated transmission and reception of operating plasma antennas over a wide frequency range 500 mhz20 ghz. A selfconsistent model on cylindrical monopole plasma. We have had the following experimental demonstrations of plasma antennas. Plasma antenna shielding esmaeil farshi, igor alexeff. Pdf a plasma antenna was constructed using a commercially available fluorescent tube with length. The results show that the band width with return loss below10db of the circular plasma monopole antenna can get 123%. The results provide insight into different radiation characteristics of plasma reflectarrays. Stealthy, versatile, and jam resistant antennas made of gas this prototype plasma antenna is stealthy, versatile, and jamresistant. Hence, the reconfigurability of the antenna is superior. By using a vector network analyzer it is shown that the persistence of plasma developed inside the tube persists for longer. Although plasma antennas have only become practical in recent years when. Igor alexeff inventions, patents and patent applications. The paper analyzes the motion of electron in plasma antenna and the distribution of electromagnetic field power around the plasma antenna, and proposes a selfconsistent model according to the structure of cylindrical monopole plasma antenna excited by surface wave. Alexeff a new antenna made of plasma a gas heated to the point that the electrons are ripped free of.
The antenna design being presented at next weeks aps division of plasma physics meeting in orlando consists of gasfilled tubes reminiscent of neon bulbs. Pdf a study of plasma antenna parameters with different gases. A plasma antenna is a type of radio antenna currently in development in which plasma is used instead of the metal elements of a traditional antenna. The proposed unit cell consists of a cubic glass box filled with argon gas energized with applied ac voltage. Igor alexeff, ted anderson, sriram parames waran, and eric p. The vertical length can be 12,500 ft, as it was for the vertical. Through using fdtd method, we study the propagation of electromagnetic wave in free space in stretched coordinate. Anderson, plasma antennas, artech house, london, 2011. Research on radiation characteristic of plasma antenna. Plasma antennas refer to a wide variety of antenna concepts that incorporate some. Elf plasma antenna concept the elf plasma antenna concept uses as a current carrier an ionized column of air, created by one or more lasers, with a length on the order of the vertical electric dipole with or without corona elf antenna. The key advantages of plasma antennas are that they are highly reconfigurable and can be turned on and off. Igor alexeff, ted anderson and their group have published several great works in designing plasma using antenna such as smart plasma antenna in 1 and 8.
In the construction, the needed power supply to the fluorescent tube is controlled by an ic 555 timer. Industrial plasma antennas1 american physical society. Experimental and theoretical investigation on plasma antennas e. Plasma antennas pdf igor alexeff and ted anderson g. This paper investigates the design of four different configurations of plasma reflectarrays. Patents assigned to asi technology corporation justia. Design and fabrication of plasma array antenna with beam. Plasma antenna shielding esmaeil farshi, igor alexeff, ted anderson, university of tennessee, haleakala research and development, inc. Stealth antenna made of gas, impervious to jamming.
Igor alexeff, fellow, ieee, ted anderson, sriram parameswaran, eric p. Plasma antenna prototype for amfm radio page 85 plasma reflector antenna and prototype page 87. The results show that the impedance, voltage standingwave ratio vswr, radiation pattern and gain characteristics of the antenna can be controlled rapidly by varying not. A plasma device having low thermal noise, which results in a high signaltonoise ratio snr of the plasma device. A plasma antenna is a column of ionized gas in which the free electrons emit, absorb and reflect radio. An operating intelligent plasma antenna we have used a ring of plasma tubes operating beyond microwave cutoff surrounding a metal transmitting. Plasma antennas use partially or fully ionized gas as the conducting medium instead of metal to create an antenna. The surprising results were that the efficiencies are comparable to a copper wire antenna of the same configuration. A gaseous plasma antenna array paa is an aggregate of plasma discharges and possibly conventional metallic radiating elements, and it constitutes a promising alternative to metallic antennas for applications in which fast reconfiguration of radiation pattern, and gain is desired. Perfomance analysis of the loopshaped plasma antenna. When the plasma antenna is turned off, it stops existing. Plasma antenna plasma antennas are radio frequency antennas that employ plasma as the guiding medium for electromagnetic radiations. The plasma antenna is an emerging technology that partially or fully utilizes ionized gas as the conducting medium instead of metal to create an antenna.