Sparse Array Antenna Concepts for Spaceborne SAR Applications: An Assessment of Synthesis Methods for Very Large Active Electronically Scanned Antenna Arrays

Antenna design for Ka-band SAR systems used in earth observation missions is demanding for two reasons. A narrow beamshape results in a large aperture, and the frequency band dictates a short spacing between neighboring radiating elements. In our case, this leads to a requirement of more than a million radiating elements. In this thesis it is...

Synthesis of Multiple Beam Linear Arrays with Uniform Amplitudes

A convex iterative algorithm for the synthesis of uniform amplitude, space-tapered linear phased arrays with simultaneous multiple beam optimization for 5G applications is presented. The performance of the algorithm is demonstrated by the synthesis of two arrays having 16 and 24 elements with 60 and 90 degree scan range, respectively. The effect...

Density Tapering for Sparse Planar Spiral Antenna Arrays

Increasing demands for mobile internet access have led to exponential developments in mobile communications technologies. The next generation mobile technology is expected to exploit electronic beam steering and to have a higher operating frequency to facilitate a higher bandwidth. This places a heavy burden on the base station antenna arrays,...