Research and Developement of Parallel Plate Slot Array Antennas for Synthetic Aperture Radar

This manuscript covers two aspects of parallel plate slot array antennas for synthetic aperture radar. The first pertains to a series-fed slot array antenna, which employs a non-inclined slot array to excite a plane wave within a parallel plate waveguide, resulting in enhanced aperture efficiency. Our investigations yield 1.2 dBi directivity and a 21.0% improvement in aperture efficiency compared to conventionally inclined slot feeds. The article describes the use of a corporate-feed slot array antenna, which uniformly excites all slots with equal amplitude and phase to enhance bandwidth from 300 MHz to 1.2 GHz in the 10 GHz band. This results in a significant improvement in resolution from 1 m to 25 cm.