Last edited by Fegis
Monday, April 13, 2020 | History

3 edition of Reconfigurable array of radiating elements (RARE) controlled by light found in the catalog.

Reconfigurable array of radiating elements (RARE) controlled by light

Reconfigurable array of radiating elements (RARE) controlled by light

interim technical progress report, reporting period 01/14/94 to 04/14/94

by

  • 384 Want to read
  • 6 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, D.C, Springfield, Va .
Written in English

    Subjects:
  • Antenna design.,
  • Electro-optics.,
  • Microstrip antennas.,
  • Microstrip transmission lines.,
  • Microwave antennas.,
  • Optical control.,
  • Silicon.

  • Edition Notes

    StatementLev Sadovnik, principal investigator.
    SeriesNASA contractor report -- NASA CR-195828.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15402018M

    Dual-Polarized Array Radiating Elements Based on Electromagnetic Dipole Concept Ridhwan Khalid Mirza1, Yan (Rockee) Zhang1, Dusan Zrnic2 and Richard Doviak2 1Intelligent Aerospace Radar Team, Advanced Radar Research Center, School of ECE, University of Oklahoma 2 National Severe Storm Laboratory, NOAA • Similar approach is extended to design a stacked ring using full wave spectral. Y. Tawk, J. Costantine and C. G. Christodoulou, "An Eight-Elements Reconfigurable Diversity Dipole System", IEEE Transactions on Antennas and Propagation, Early. If A is a vector, then prod(A) returns the product of the elements.. If A is a nonempty matrix, then prod(A) treats the columns of A as vectors and returns a row vector of the products of each column.. If A is an empty 0-by-0 matrix, prod(A) returns If A is a multidimensional array, then prod(A) acts along the first nonsingleton dimension and returns an array of products. The different radiating elements used for the phased array antenna research aremultiple modes based radiating elements, frequency agile and polarization reconfigurable radiating element, and millimeter wave (W-band) series fed linear array. Similarly, the emerging massive MIMO array antenna development effort for 5G.


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Reconfigurable array of radiating elements (RARE) controlled by light Download PDF EPUB FB2

Get this from a library. Reconfigurable array of radiating elements (RARE) controlled by light: interim technical progress report, reporting period 01/14/94 to 04/14/ [Lev Sadovnik; United States.

National Aeronautics and Space Administration.]. In particular, the structure of the manuscript is as follows: in Section 2, we show that, by properly superimposing two different radiating modes of a patch antenna, one of which exhibiting a phase singularity, we can change the location of this singularity and, thus, directly shape or rotate the radiation pattern of the radiating specifically, by varying the excitation amplitude.

A novel reconfigurable radiating plasma antenna array based on Yagi antenna technology. of a two-element plasma antenna array by altering the input ionizing power and turning on certain antenna array elements. In a reconfigurable patch array antenna surrounded by plasma tubes has been presented, Cited by: 1.

In [3], a pattern reconfigurable microstrip parasitic array antenna was designed, the antenna had three radiating elements. The main patch is placed midway between the other two elements that.

@article{osti_, title = {Study of the characteristics of reconfigurable plasma antenna array}, author = {Alias, Nur Salihah and Dagang, Ahmad Nazri and Ali, Mohd Tarmizi}, abstractNote = {This paper presents a design and simulation of a reconfigurable array of plasma antenna.

The plasma column is used as radiating elements instead of metal to create an antenna. Author by: Jafar Shaker Languange: en Publisher by: Artech House Format Available: PDF, ePub, Mobi Total Read: 59 Total Download: File Size: 51,7 Mb Description: Reflectarray antennas refer to the class of radiating structures that are comprised of an array of radiating elements, re-radiating the energy that is impinged on them from one or more radiating feeds that are located in.

The final array element exhibits insertion losses of around dB with a phase range over •, but the bandwidth was increased from to MHz at the same central frequency.

@article{osti_, title = {A reconfigurable plasma antenna}, author = {Kumar, Rajneesh and Bora, Dhiraj}, abstractNote = {An experiment aimed at investigating the antenna properties of different plasma structures of a plasma column as a reconfigurable plasma antenna, is reported.

A 30 cm long plasma column is excited by surface wave, which acts as a plasma antenna. Chapter 10Reconfigurable Antennas 1 Introduction The concept of reconfigurability suggests the ability of a system to dynamically modify its performance. We define a reconfigurable antenna (RA), as one which - Selection from Compact Antennas for Wireless Communications and Terminals: Theory and Design [Book].

This work presents the development of optically controlled reconfigurable antenna arrays. They are based on two patch elements with E-shaped slots, a printed probe, and a photoconductive switch made from an intrinsic silicon die.

Numerical simulations and experiments have been shown to be in agreement, and both demonstrate that the frequency response of the antenna arrays can be efficiently Cited by: 9. Reconfigurable Microstrip Switched Line Phase Shifter: For Beam Steering Applications [Puneet Anand] on *FREE* shipping on qualifying offers.

Beam-steering antennas are the ideal solution for a variety of system applications including traffic control. This paper presents a design and simulation of a reconfigurable array of plasma antenna.

The plasma column is used as radiating elements instead of metal to create an antenna. The advantages of the plasma antenna over the conventional antenna are its possible to change the operating parameters, such as the working pressure, input power, radius Author: Nur Salihah Alias, Ahmad Nazri Dagang, Mohd Tarmizi Ali.

This paper presents a design and simulation of a reconfigurable array of plasma antenna. The plasma column is used as radiating elements instead of metal to create an antenna.

The advantages of the plasma antenna over the conventional antenna are its possible to change the operating parameters, such as the working pressure, input power, radius of the discharge tube, resonant Author: Nur Salihah Alias, Ahmad Nazri Dagang, Mohd Tarmizi Ali.

3 Electronically Steerable Parasitic Array Introduction. A parasitic array antenna consists of a driven element and several parasitic Reconfigurable array of radiating elements book antenna is the only active radiating element, and the RF energy is distributed from the driven element to parasitic elements by Reconfigurable array of radiating elements book coupling.

uninitialized elements of a string array will contain empty strings True even if a array is defined locally if a local array is completely uninitialized, its elements will contain garbage, like all other local variables If you leaves an element unitialized, you must leave all the elements.

A reconfigurable antenna is an antenna capable of modifying its frequency and radiation properties dynamically, in a controlled and reversible manner. In order to provide a dynamic response, reconfigurable antennas integrate an inner mechanism (such as RF switches, varactors, mechanical actuators or tunable materials) that enable the intentional redistribution of the RF currents over the.

Array Factor - Uniform Spacing, Nonuniform Amplitude Consider an array of isotropic elements positioned symmetrically along the z-axis (total number of elements = P).

The array factor for this array will be determined assuming that all elements are excited with the same current phase (= 0o for simplicity) but nonuniform current Size: KB. shaped elements. Such a choice allows to achieve a good aperture e–ciency and very low pseudo-grating lobes while using only two difierent kinds of radiating elements.

Preliminary results are shown and discussed with reference to both cases wherein the single tiles are not fully populated and wherein ad-hoc sub-array radiators are used. Applications of Advanced Reconfigurable Antenna for the Next Generation 4G Communication Devices: /ch The objective of this chapter is to show the applications of innovative reconfigurable antenna methodologies for the 4G devices.

Microwave antenna technologyAuthor: Massimo Donelli. Reflectarray antennas refer to the class of radiating structures that are comprised of an array of radiating elements, re-radiating the energy that is impinged on them from one or more radiating feeds that are located in free space.

This book begins with introductory material on reflectarray antennas and progresses to the presentation of. In this paper, experimental data was demonstrated the concepts of reconfigurable number of elements that produced broad beam and narrow beam radiating pattern characteristic.

Using modified WPD in the antenna structure, produced better performance in term of return loss characteristic. This research has taken advantage of the flexibility of the number of element technique by applying it to the.

When individual antenna elements are aggregated into arrays of elements, new response/radiation patterns are created which depend upon both the element patterns and the geometry of the array.

These patterns are called beampatterns to reflect the fact that the pattern can be constructed to have a narrow angular distribution, that is, a beam. The present thesis deals with the design of a planar antenna array for the communication between a civil aircraft (Dassault's Falcon) and an Inmarsat satellite.

The final goal is to provide high speed Internet access in X/Ku-Band (GHz / GHz), and possibly even in K/Ka- Band (GHz / GHz). The study starts with the Ku-Band only, then evolves towards the transmission band and Author: Baptiste Fernand Hornecker.

A cell sub-array of 3 radiating elements shown in Fig. 2.b is considered the basic module to build the planar triangular arrays. The whole cell fulfills radiation requirements since it has a good polar to crosspolar ratio and a very low axial by: 9. The rapid development of wireless communication systems in recent years has created a strong need for the development of new antenna structures.

In this context, reconfigurable antennas have become very attractive for modern wireless communications because they allow the use of a single antenna for multiple systems. The research described in this thesis introduces the concept of reconfigurable Author: Nurulazlina Ramli. Dual‐polarized antenna radiating element is a critical component in the Multi‐function Phased Array Radar (MPAR).

This paper studies the dual‐polarized radiating element based on the EM dipole concept. Two different geometries, i.e., loop approximated as magnetic dipole and a printed electric dipole, are used to form a single dual‐polarized radiating : Ridhwan Khalid Mirza, Yan (Rockee) Zhang, Dusan Zrnic, Richard Doviak.

This document gives a view of certain active radiating elements for reconfigurable patch arrays. In literature it could be found different possibilities to obtain feasible reconfigurable antennas, whether placing the active circuitry in the transmission lines or directly over the radiating element.

In this paper, the second option is chosen and active radiating elements are analyzed, designed. Research Article Optically Controlled Reconfigurable Antenna Array Based on obtained through the use of two radiating elements printed in a low-cost substrate and a dihedral corner re ector. Introduction In this way, the proposed OCRA array can be easily.

Conventionally, parabolic reflectors and phased array antennas have been used for the antenna applications. However, in J. Huang proposed microstrip reflectarray as an alternative to the bulky parabolic reflector and expensive phased array antennas [1].

Microstrip reflectarray consists of an array of microstrip patches printed on a. A phased array antenna is an array antenna whose single radiators can be fed with different phase shifts.

As a result, the common antenna pattern can be steered electronically. The electronic steering is much more flexible and requires less maintenance than the mechanical steering of the antenna.

The proposed pattern reconfigurable antenna in this paper can be viewed as the degenerated antenna array shown in Figure 3a. (The whole structure of the reconfigurable antenna can be divided into three parts shown in Figure 3a, i.e., the left part, middle part, and right part.

These three parts constitute an antenna array with three : Ke Han, Zhongliang Deng, Xubing Guo. In this research, a reconfigurable metamaterial (MM) structure was designed using a millimeter-wave (MMW) band with two configurations that exhibit different refractive indices.

These two MM configurations are used to guide the antenna’s main beam in the desired direction in the 5th generation (5G) band of 28 GHz. The different refractive indices of the two MM configurations created phase Author: Bashar Ali Esmail, Huda A Majid, Zuhairiah Zainal Abidin, Samsul Haimi Dahlan, Mohamed Himdi, Raimi.

The lens antenna consists of an offset parabolic reflector fed by a single feed, and a reconfigurable electromagnetic lens located between the feed and the reflector. The lens comprises an RX and TX array of radiating elements, with ferrite phase shifters connecting the RX and TX by: 5.

Abstract -- A reconfigurable C and Ku band patch antenna with C-Slot and dual-patch elements is proposed and studied. It occupies a compact volume of 80× 60× mm, including the ground plane. The antenna can operate in 4,5,10 and 12 GHz bands.

Two C-Slots on the patch elements. Store the information in a element array. Display the 10 numbers back to the user. I could do all of the above in main(). Hint: You should use loops, not hardcode the values 0 through 9. It should be easy to convert your program to accept numbers instead of For a bonus mark, do at least one of the tasks (a or b) in a separate.

Unlike reconfigurable dipoles (e.g., FIGS. 2 and 3, etc.) and reconfigurable loops (e.g., FIG. 4, etc.), the control, power, and ground traces used to drive the switching elements of the reconfigurable microstrip antenna shown in FIG.

9 may be electrically shielded from the radiating element by the ground plane. Thus, the performance of the Cited by: 4. In this work, we present a numerical study of the use of reconfigurable arrays (RCA) for vibro-acoustography (VA) beam formation.

A parametric study of the aperture selection, number of channels, number of elements, focal distance, and steering parameters is presented in order to show the feasibility and evaluate the performance of VA imaging based on by: I have a java class which involves a String array and two for loops for going through the array elements and prints them plus their redundancy in the array as they are Strings.

I want someone. Author by: Jafar Shaker Languange: en Publisher by: Artech House Format Available: PDF, ePub, Mobi Total Read: 65 Total Download: File Size: 45,9 Mb Description: Reflectarray antennas refer to the class of radiating structures that are comprised of an array of radiating elements, re-radiating the energy that is impinged on them from one or more radiating feeds that are located in.

Plutonium (Understanding the Elements of the Periodic Table) [Roza, Greg] on *FREE* shipping on qualifying offers. Plutonium (Understanding the Elements of the Periodic Table)5/5(1). Reversing the elements of an array involves swapping the corresponding elements of the array: the first with the last, the second with the next to the last, and so on, all the way to the middle of the array.

Given an array a and two other int variables, k and temp, write a loop that reverses the elements of the array. Do not use any other variables besides a, k, and temp.Because values have not been assigned to the other elements of the array, question marks will be used to indicate that the contents of the those elements are unknown If an array is defined globally, all of its elements are initialized to zero by defaults.A fiber optic data distribution system is disclosed for distribution of the phase shift commands to an electronically steered antenna array.

Novelties include the fan-out of a single bundle to multiple receptors, equalization of optical path for precise synchronization, the use of the RF active side of the antenna for data distribution, the use of the antenna radome as support structure for Cited by: