Compact Antenna for Digital Beamforming with Software Defined Radios

An adaptive radio system combining compact
switchless reconfigurable antenna with Software Defined Radio is
proposed. The system allows control of the direction of the
transmitted signal solely by adjusting the baseband I and Q
components of the modulated signal, while maintaining small
antenna size through the use of compact multiport antenna. The
system is demonstrated in a line-of-sight configuration with
QPSK modulation. Experimental results demonstrate good
received power and low error vector magnitude of the
demodulated signals.