Miniaturized and frequency-agile planar multibeam array antenna

This paper overviews two miniaturized and two frequency-agile multibeam array antennas developed in our group. First of all, based on the low temperature co-fired ceramic (LTCC) fabrication process, the entire multibeam antenna size is only equal to the size of radiating aperture by carefully embedding the complicated substrate integrated waveguide (SIW) feeding network underneath the radiating array. After that, a single-layer millimeter-wave miniaturized multibeam structure can be developed through the normal PCB fabrication process based on the asymmetrical beamforming technology. Then, two different types of frequency-agile multibeam antennas are introduced based on the frequency-agile Butler matrix and the frequency-agile antenna element technologies.