Miniature Tri-polarized Antenna for Polarization Sensitive Arrays

This paper proposed a miniature tri-polarized antenna that working at 2.4 GHz for polarization sensitive arrays. This antenna consists of a double-layer microstrip patch antenna and a disk-loaded monopole with short pin, which only occupies a volume of
$70\text{mm}\times 70\text{mm}\times 15\ \text{mm}$
. The antenna can provide three orthogonal polarizations by feeding three ports respectively. The gain provided by horizontal polarized microstrip antenna at 2.4 GHz is above 7 dBi while the gain provided by vertical polarized monopole is about 1 dBi. Impedance bandwidth of this antenna is about 200 MHz and isolation between ports is better than −20 dB in operating band.