Results 171 to 180 of about 5,646 (202)

Genetic optimization of microstrip reflectarrays

IEEE Antennas and Propagation Society International Symposium (IEEE Cat. No.02CH37313), 2005
Printed reflectarrays try to combine the advantages of both reflectors and printed arrays (see e.g. [l]) and consist in arrays of printed patches, illuminated by a primary feed horn, that re-radiate the illuminating power back into the space. Since the elements have different positions, the field that propagates from the feed to the patches covers ...
ZICH, RICCARDO, MUSSETTA, MARCO, TOVAGLIERI M, PIRINOLI P, OREFICE M.   +4 more
openaire   +2 more sources

Optimization of a Gangbuster Reflectarray Antenna

2005 IEEE Antennas and Propagation Society International Symposium, 2005
In this paper we discuss the optimization of the design, carried out through a pseudo-random optimization algorithm, of a gangbuster reflectarray antenna. The variation of reflection coefficient phase on the reflectarray surface is achieved by varying the length of the local wires in the gangbuster surface. For the optimization, a genetic algorithm has
MUSSETTA, MARCO, PIRINOLI P, BLIZNYUK N, ENGHETA N, ZICH, RICCARDO   +4 more
openaire   +1 more source

Editor's comments [reflectarray]

IEEE Antennas and Propagation Magazine, 2013
The reflectarray is a familiar antenna structure. It often allows replacing a thick, expensive reflector with a thin, flat, relatively low-cost device. A phase-shifting surface is a structure that is analogous to a reflectarray but utilizing transmission, replacing a lens antenna with a thin, flat, low-cost multilayer printed structure.
openaire   +1 more source

Broadrange L-probe reflectarray

2016 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE), 2016
A new reflectarray is designed using two co-joined L-shaped probes. In this case, the horizontal lengths of the two L-shaped probes are functioning as the phase-shifters. The unit element is simulated using the Floquet cell, and simulation shows that the unit element is able to provide a linear phase range of 454.2°.
W. H. Ng, K. Y. Lee, E. H. Lim, Y. N. Phua, B. K. Chung   +4 more
openaire   +1 more source

Integrated mems reflectarray elements

2006 First European Conference on Antennas and Propagation, 2006
Reflectarrays have attracted substantial interest in recent years as low-profile replacements for reflector antennas, particularly in space applications. Tunability adds a new dimension to reflectarrays, enabling them to form dynamically-controllable radiation patterns for beam-forming applications.
Sean V. Hum, G. McFeetors, M. Okoniewski
openaire   +1 more source

Millimeter-wave waveguide reflectarray

2015 International Siberian Conference on Control and Communications (SIBCON), 2015
In this paper millimeter-wave reflectarray research, simulation and measurements results are presented. Waveguide elements were used as reflectarray unit cell. Exponential horn was used as illuminator. Low profile reflectarray transforms wavefront like a conventional parabolic reflector.
S. V. Polenga, A. V. Stankovsky, R. M. Krylov, A. D. Nemshon, Y. A. Litinskaya, Yu. P. Salomatov   +5 more
openaire   +1 more source

Printed millimeter-wave reflectarrays

Annales Des Télécommunications, 2001
Des structures periodiques et quasi-periodiques, imprimees sur un substrat dielectrique peuvent etre employees pour commander les proprietes de reflexion et de transmission des ondes incidentes en fonction de la structure geometrique. Ceci peut etre realise pratiquement independamment pour les deux polarisations.
Dietmar Pilz, Wolfgang Menzel
openaire   +1 more source

Reflectarrays: Potentials and Challenges

2007 International Conference on Electromagnetics in Advanced Applications, 2007
The paper gives an overview of research activities on reflectarrays. It revisits the original concept of reflectarray and describes how its realization evolved over the last three decades. Fixed-beam and electronically steered varieties of this antenna are considered.
M. E. Bialkowski, J.A. Encinar
openaire   +1 more source

Circular polarized reflectarray antenna

20th Iranian Conference on Electrical Engineering (ICEE2012), 2012
In this paper, aperture coupled dielectric resonator antenna loaded with rotated strip, is used as a CP element for reflectarray antenna. Phase variations are obtained by a symmetric change in the length of the stub. The effect of the various parameters of the structure on the slope of the phase curve is studied. Simulations are carried out with Ansoft
Farzaneh Ahmadi, Keyvan Forooraghi, Zahra Atlasbaf   +2 more
openaire   +1 more source

Proximity-Coupled Microstrip Reflectarray

IEEE Transactions on Antennas and Propagation, 2004
In this paper, a microstrip reflectarray on a two-layer substrate is presented. The delay lines were proximity-coupled to corners of patches. Compared with delay lines in a single-layer reflectarray, the delay lines used here play two important roles: phase delay and impedance match. As it is a two-layer structure, we can get more design flexibilities.
T.N. Chang, Y.C. Wei
openaire   +1 more source