Measurements of sparse and compact phased array antenna architectures

Sparse phased array antenna architectures that reduce the number of receiver channels are discussed and measured results of different architectures are presented. We show that by using multiple transmit antenna positions the receiver array can be sparse and hence the number of receiver channels reduced, still avoiding grating lobe effects. We also present a compact and sparse architecture using multiple transmit antenna elements on both sides of the receive array with a physical size closed to one half of the conventional solution.