Dual Linearly Polarized Common Aperture Microstrip Antenna for S- and C-Band Communication

This manuscript presents the design and development of an S-/C-band common aperture microstrip antenna. It is dual linearly polarized at both bands. The S-band radiator is proximity coupled to two orthogonal microstrip feedlines. The C-band array is an aperture coupled to other two mutually orthogonal microstrip feed network that generate vertical polarization (VP) and horizontal polarization (HP). The dependencies of isolation on relative slot positions and interlayer spacing have been investigated. The antenna yields an impedance bandwidth of wider than 3.65% at the S-band with isolation better than 26 dB. At C-band ports, it exhibits wider than 21.9% impedance bandwidth and isolation higher than 45 dB over the realized band. Design details, findings of the parametric investigation, and experimental results are presented here. Measured results are improved compared to the earlier reported works.