Diffractive Dielectric Microwave Beam Deflection System

The patent replaces the traditional mechanical gimbal mechanism with a diffractive optical system. Instead of mechanically rotating the entire antenna assembly, the invention uses diffractive components (gratings and lenses) to deflect the microwave beam electrically. The beam direction is controlled by adjusting the diffractive elements rather than moving heavy mechanical parts, thereby eliminating fragile rotary joints and reducing mechanical complexity while maintaining full pointing capability.

The patent introduces diffractive components as intermediaries between the fixed antenna and the desired beam direction. These components (diffractive gratings and lenses) act as mediators that redirect the microwave beam without requiring mechanical movement of the antenna itself. The intermediary elements enable beam steering through optical diffraction principles rather than mechanical rotation.

The patent changes the operating parameters of the diffractive components to achieve wider angular deflection. By optimizing the grating periods, lens focal lengths, and component spacing, the system extends the beam deflection range beyond the 60° limitation of electronic scanning. The parameter optimization allows the diffractive system to achieve ±60° or greater angular range while maintaining a fixed physical antenna structure.

The patent employs composite diffractive-optical components combining multiple functional elements (diffractive gratings, lenses, and reflective surfaces) in a single integrated assembly. This composite approach enables the system to achieve wide angular coverage through the combined effects of multiple optical elements rather than relying on a single limiting mechanism.

The patent replaces the Cassegrain parabolic reflector system with a diffractive beam steering mechanism. Instead of using a large parabolic dish with a secondary reflector that causes shading losses, the invention uses compact diffractive gratings and lenses to deflect the beam from a smaller feed antenna. This substitution eliminates the shading problem entirely since there are no blocking reflectors in the optical path.

The patent transitions from a two-dimensional parabolic reflector geometry to a three-dimensional diffractive optical system. The diffractive components manipulate the beam in multiple dimensions through diffraction and refraction, achieving beam steering without the geometric constraints and shading effects inherent in traditional parabolic Cassegrain designs.

The patent optimizes the geometric parameters of the sub-wavelength microstructures to balance compactness and manufacturability. By carefully selecting the period, depth, and shape of the microstructures, the design achieves sufficient diffraction control while remaining within current fabrication capabilities. Parameter optimization allows the system to be compact without requiring impossible manufacturing precision.

The patent applies different microstructure designs to different regions of the diffractive components. Rather than using uniform structures throughout, the design varies the local microstructure properties to achieve the desired beam pattern while maintaining manufacturability in each local region. This localized optimization allows compact dimensions without excessive precision requirements across the entire component.