Two structures for low-cost low-profile DBS antennas on the move have been investigated. The first structure is based on slotted waveguide structure and the second one is cavity backed patches. To reduce fabrication cost, substrate integrated waveguide (SIW) technology has been used to develop both structures. Meanwhile, to keep a low profile, the antenna aperture was splitted into two or more and the outputs of the splitted structures were combined. The slotted waveguide structure has inherent radiation beam tilt angle that can significantly lead to reduced heights; but it suffers from frequency beam squint and is limited to reception of one polarization at a time. On the other hand, the cavity backed patches has relatively larger profiles as the antenna boards need to be initially inclined at 45° degrees but still need to be mechanically steered by ±25° degrees off their initial position. Preliminary results are very encouraging and will be presented here.
展开▼
