Searched for: department%3A%22Telecommunications%22
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document
Štumpf, M. (author), De Hoop, A.T. (author), Lager, I.E. (author)
Analytic time domain expressions are derived for the pulsed electromagnetic field radiated by a narrow slot antenna with a dielectric layer in a two?dimensional model configuration. In any finite time window of observation, exact pulse shapes for the propagated, reflected, and refracted wave constituents are constructed with the aid of the...
journal article 2010
document
Simeoni, M. (author), Lager, I.E. (author), Coman, C.I. (author), Roedener, A.G. (author)
A method for ensuring polarization agility in conjunction with beam steering in planar array antennas is proposed. It relies on interleaving two subarrays with orthogonal, linear polarizations that, together, can generate arbitrary polarization states: adjustable linear, elliptical, and left- or right-handed circular. The complexity of the...
journal article 2009
document
Lager, I.E. (author), Trampuz, C. (author), Simeoni, M. (author), Ligthart, L.P. (author)
An effective and robust strategy for concurrently designing the transmit and receive antennas of a frequency-modulated, continuos-wave radar is discussed. The aperture architecture is based on the use of non-periodic, interleaved sub-arrays. Deterministic element placement is employed for ensuring design efficiency. The procedure yields...
journal article 2009
document
Tanyer-Tigrek, F.M. (author), Tran, D.P. (author), Lager, I.E. (author), Ligthart, L.P. (author)
An optimized coplanar waveguide fed quasimagnetic printed antenna for ultra wideband applications is described. A parameter study, motivated by a design procedure, allowed a substantial increase in the return-loss operational bandwidth. The numerically predicted performance was validated by means of physical measurements of fabricated samples....
journal article 2009
document
De Hoop, A.T. (author), Lager, I.E. (author), Tomassetti, V. (author)
A novel time-domain approach to the derivation of the pulsed electromagnetic field multiport antenna system reciprocity theorem is presented. The theorem interrelates the field and system properties in two states: the transmitting state and the receiving state. General time-domain Thevenin (voltage-source, impedance-based) and Norton (electric...
journal article 2009
document
Viganó, M.C. (author), Toso, G. (author), Caille, G. (author), Mangenot, C. (author), Lager, I.E. (author)
A deterministic procedure to design a nonperiodic planar array radiating a rotationally symmetric pencil beam pattern with an adjustable sidelobe level is proposed. The elements positions are derived by modifying the peculiar locations of the sunflower seeds in such a way that the corresponding spatial density fits a Taylor amplitude tapering...
journal article 2009
Searched for: department%3A%22Telecommunications%22
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