Abstract—A new type of dual-polarization and dual-frequency
multilayer-stacked microstrip array antenna is introduced. The
feeding mechanism of the element is the aperture coupling for
one polarization and the direct feeding for the orthogonal
polarization. The microstrip element exhibits a wideband of
operation. A slot etched on driven patch is used to improve
isolation performance of the proposed antenna element, and the
better impedance characteristic is obtained as well. Measured
results agree well with the simulation, exhibiting a |S11|≤10dB
bandwidth of 16.6% in V-port and 14.28% in H-port. The
measured isolation is better than 30dB. Good radiation patterns
and low cross-polarization level are also confirmed.