Flexible Dual Linear Polarized H-shaped Aperture Coupled Antenna with High Port Isolation

A flexible dual linear polarized $\mathbf{H}$-shaped aperture coupled S-band array is presented. The array uses flexible polyimide printed circuit board (FPC) technology and polyethylene foam (PF-4). The antenna comprises an aperture FPC layer, two separate FPC layers for the feed networks of the orthogonal polarizations, and an FPC patch. These layers are separated by PF-4 foam to enable conformability. The antenna is tested on a flat surface and conformed to cylindrical surfaces with radius of $\mathbf{2 0 0} \mathbf{~ m m}, \mathbf{1 5 0} \mathbf{~ m m}$, and $\mathbf{1 0 0} \mathbf{~ m m}$. The measured antenna provides conformability, dual linear polarization, high impedance bandwidth (20-25%), and port isolation larger than $\mathbf{3 0} \mathbf{d B}$.