Sinusoidal Folded Waveguide Slot Layout for Lobe-Free Antenna Patterns
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing waveguides used in radar systems and other devices fail to prevent grating lobes on either side of horizontal-polarity main beams and X-band lobes on either side of vertical-polarity main beams, limiting the precision of antenna patterns.
Innovation Solution
A folded waveguide with a hollow core and sinusoidal shape that includes radiation slots, arranged to dissipate electromagnetic radiation and prevent grating or X-band lobes by controlling the separation and size of these slots, allowing for precise antenna pattern control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional waveguide is used to improve antenna characteristics, then electromagnetic radiation can be leaked to improve antenna pattern, but grating lobes and X-band lobes cannot be prevented
Solution Approach 1:
The waveguide is divided into multiple sections with different wall thicknesses. First and second portions of the waveguide have different wall thicknesses, allowing different regions to perform different functions: one region leaks electromagnetic radiation to improve antenna pattern while another region blocks radiation to prevent grating lobes and X-band lobes
Solution Approach 2:
Different portions of the waveguide are given different local properties through varying wall thicknesses. The waveguide structure transitions from uniform thickness to non-uniform thickness, where specific sections have increased wall thickness to prevent lobe formation while other sections maintain thinner walls for radiation leakage
2Object-generated harmful factors
If waveguide wall thickness is increased to prevent lobes, then harmful grating and X-band lobes are reduced, but electromagnetic radiation leakage is reduced
Solution Approach 1:
The waveguide is segmented into multiple portions with different wall thicknesses, allowing simultaneous optimization of radiation leakage and lobe prevention in different sections of the same waveguide structure
Solution Approach 2:
The solution moves from a single-dimensional parameter (uniform wall thickness) to a multi-dimensional approach by varying wall thickness along the longitudinal axis of the waveguide, creating a gradient structure that optimizes both radiation leakage and lobe prevention
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 folded waveguide effectively prevents grating and X-band lobes, enabling more precise antenna patterns and improved performance in radar systems and other electromagnetic signal applications.
Implementation Method 1
The described waveguide includes a hollow core... The hollow core further forms a plurality of radiation slots, each of the radiation slots including a hole through one of multiple surfaces of the folded waveguide that defines the hollow core
Data Source
AI summary
This document describes a folded waveguide for antenna. The folded waveguide may be an air waveguide and includes a hollow core that forms a rectangular opening in a longitudinal direction at one end, a closed wall at an opposite end, and a sinusoidal shape that folds back and forth about a longitudinal axis that runs in the longitudinal direction through the hollow core. The hollow core forms a plurality of radiation slots, each including a hole through one of multiple surfaces that defines the hollow core. The radiation slots are arranged on the one surface to produce a particular antenna pattern. The radiation slots and sinusoidal shape enable the folded waveguide to prevent grating lobes from appearing in the particular antenna pattern on either side of a horizontal-polarity, main beam, or to prevent X-band lobes from appearing in the particular antenna pattern on either side of a vertical-polarity, main beam.