Dual-polarized stacked C-band antenna element with novel hairpin-type contactless stripline to stripline transition in multilayer integrated structure for SAR applications

Stacked dual-polarized antenna element for SAR applications is presented. The antenna element operates in C-band having 8% bandwidth. In order to achieve high isolation between ports generating orthogonal polarization orthogonal placement of two coupling slots has been applied. To provide additional isolation between vertical and horizontal polarizations the feeding lines generating orthogonal polarizations have been placed on different layers of multilayer stripline structure. Contactless hairpin-type band-pass transition between adjacent stripline layers has been designed and applied within the antenna feeding network to eliminate via interconnections and possible excitation of leaky modes. The measured results of the manufactured antenna element are in good agreement with the calculated ones.