Curved Near-Field-Focused Slot Array Antenna Design
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Solution Overview
Problem
Existing near-field-focused antennas face challenges in maintaining stable focal height and wide scanning range due to sensitivity to frequency changes and sparse element distribution, limiting their application in non-contact detection and imaging systems.
Innovation Solution
A curved near-field-focused slot array antenna design featuring a smooth curved surface with planar feed structures and a substrate integrated waveguide, where the spatial placement of radiating slots and metallic vias form a curved waveguide to achieve stable phase distribution and compact slot distribution, enabling wide scanning and high peak power flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the width of the transmission line is modified to change its phase constant, then the phase distribution can be adjusted, but the phase becomes sensitive to frequency changes, deteriorating the quality of the near-field-focused beam
Solution Approach 1:
The patent employs a curved transmission line structure instead of a straight line. The curvature introduces a geometric phase effect that compensates for the frequency sensitivity of the width-modified transmission line. By carefully designing the curvature radius and path length, the patent achieves frequency-insensitive phase control, resolving the contradiction between ease of phase operation and frequency stability.
Solution Approach 2:
The patent changes multiple parameters simultaneously: transmission line width, curvature radius, and path length. By optimizing these parameters together, the patent achieves a phase constant that is less sensitive to frequency variations while maintaining the desired phase distribution for near-field focusing.
2Ease of operation
If the spacing of the radiating elements is adjusted to achieve the desired phase distribution, then the quadratic phase distribution can be obtained, but the element distribution becomes sparse and nonuniform, which cannot meet the scanning requirements
Solution Approach 1:
The curved transmission line structure provides a continuous phase progression along the arc, enabling uniform element spacing while achieving the required quadratic phase distribution. The curvature allows the phase to vary smoothly with position, maintaining both phase control and scanning adaptability.
Solution Approach 2:
The patent transitions from a one-dimensional linear array to a two-dimensional curved array. This dimensional change allows the incorporation of an additional degree of freedom in phase control through the curvature, enabling both quadratic phase distribution and uniform spacing to be achieved simultaneously.
3Adaptability or versatility
If the height of the focus is reduced to increase the scanning range, then the scanning range can be widened, but the focal quality deteriorates
Solution Approach 1:
The curved transmission line structure maintains a constant focal height while achieving wide scanning range through the geometric phase effect. The curvature allows the phase to be controlled independently of the focal distance, decoupling the scanning range from the focal quality degradation that occurs in conventional designs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The curved design enhances amplitude and phase control capabilities, providing a stable focal height over a wide steerable range and improved scanning performance compared to traditional planar designs, with better peak power flatness and wider scanning range.
Implementation Method 1
the dielectric substrate layer comprises metallic vias symmetrically arranged on both sides of the central line of the antenna to form a substrate integrated waveguide
Implementation Method 2
The upper copper metal layer comprises radiating slots, and adjacent radiating slots in a linear array have opposite offsets along the center line of the slot array antenna
Data Source
AI summary
A slot array antenna including a smooth curved surface and planar feed structures which are respectively disposed at two ends of the smooth curved surface and are tangent to the smooth curved surface. The smooth curved surface includes at least two arcs mutually connected by smooth transition. The at least two arcs each includes an upper copper metal layer, a lower copper metal layer, and a dielectric substrate layer between the upper and lower copper metal layers. The upper copper metal layer includes radiating slots, and the adjacent radiating slots in a linear array have opposite offsets along the center line of the slot array antenna. The dielectric substrate layer includes metallic vias symmetrically arranged on both sides of the central line of the antenna to form a substrate integrated waveguide.