Double-Sided Sinuous Antenna for Polarization Purity
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Solution Overview
Problem
Wideband directional antennas with linear polarization suffer from degraded accuracy in measuring the direction of arrival due to polarization purity defects, leading to 'clouding' that worsens with elevation, affecting detection system performance.
Innovation Solution
A double-sided printed circuit antenna design with symmetrical radiating elements on both faces, rotated by 180° and translated by the circuit thickness, enhances polarization purity by maintaining identical element shapes across faces, improving copolarization to cross-polarization ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-sided printed circuit antenna design is used, then the device complexity is reduced, but the polarization purity deteriorates leading to clouding and degraded location performance
Solution Approach 1:
The patent transitions from a single-sided (2D) printed circuit antenna to a double-sided (3D) configuration. The second radiating circuit is placed on the opposite face of the substrate, creating a three-dimensional structure that improves polarization purity by more than 10 dB while maintaining wideband directional characteristics.
2Measurement precision
If empirical solutions like metal wire arrays are added to improve polarization purity, then the polarization purity improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent integrates both radiating circuits directly into the printed circuit board structure, merging the functions of radiation and polarization control into a single manufactured component. This eliminates the need for separate metal wire arrays or empirical additions, maintaining ease of manufacture through standard PCB fabrication processes.
3Area of stationary object
If the antenna operates at non-zero elevations, then the coverage area is improved, but the polarization purity defects increase causing clouding
Solution Approach 1:
The patent creates a composite antenna structure with two identical radiating circuits on opposite faces of a dielectric substrate. This composite configuration maintains stable polarization purity across different elevation angles, enabling improved coverage area without the clouding effect that plagues single-sided designs at non-zero elevations.
Data Source
AI summary
In the field of wideband directional antennas employing linear polarization, and in particular in the context of amplitude goniometry systems, polarization purity defects lead to deformation of the radiation diagrams that increases with the elevation, inducing degraded detection system location performance. An antenna is provided operating with linear polarization and having radiating elements of “sinuous” shape inscribed within a circle, and includes radiating elements printed on the two faces of a support, the elements of the first face being deduced from those of the other face by a rotation.