Shared aperture array antennas composed of differently sized

A novel solution for conceiving wide band (multi-band) array antennas is presented. The solution is based on the concept of interleaving sparse, sub-arrays operating at separate frequencies. Sparse array antennas offer two major advantages, namely: they have non-uniformly distributed elements, with possibly large distances between elements (this providing the necessary space for interleaving different sub-arrays), and they do not require the amplitude tapering of the elements for controlling the array radiation pattern.Electrical Engineering, Mathematics and Computer Scienc

Patch end-Launchers-a family of compact colinear coaxial-to-rectangular waveguide transitions

Electrical Engineering, Mathematics and Computer Scienc

The design of shared aperture antennas consisting of differently sized elements

Electrical Engineering, Mathematics and Computer Scienc

Implementation of polarization agility in planar phased-array antennas by means of interleaved subarrays

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 resulting system is comparable with that of standard, fully populated array antennas consisting of identical, linearly polarized elements. By dynamically controlling the amplitude and the phase of the signals fed to the subarrays, a stable polarization state can be maintained during beam steering. The concept is validated by numerically investigating an architecture obtained by interleaving nonuniform subarrays designed by means of a deterministic placement strategy. The effects of the mutual coupling between the different radiating elements are modeled and discussed.International Research Centre for Telecommunication and RadarElectrical Engineering, Mathematics and Computer Scienc