Collapsible, Wideband, Dual-polarization Patch Antenna

A dual polarization, collapsible patch antenna was designed and developed to reduce the stored volume. The antenna has a top square patch, two sets of differential series-resonant flexible vertical feeds, a microstrip balun and a ground plane. The antenna can be collapsed to reduce the height from about 30mm to about 3mm. The achieved bandwidth is about 40% with gain around 7 to 9dBi.