Offset-Ridge Waveguide Orthogonal Polarization
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Solution Overview
Problem
Achieving orthogonal E-field polarization in one-dimensional arrays of waveguide slot antennas while maintaining individual slot antenna spacing at or slightly greater than one-half wavelength and efficient radiated power is challenging due to incompatible design parameters.
Innovation Solution
The use of an offset-ridge waveguide with a single-mode first ridge waveguide and a second ridge waveguide, coupled with a meandering feed guide and rectangular waveguides, allows for efficient orthogonal E-field polarization by controlling energy distribution and impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If individual slot antennas are reoriented orthogonally within the array to achieve E-field polarization orthogonal to the array axis, then the desired polarization is achieved, but radiated power is greatly attenuated
Solution Approach 1:
The patent changes the waveguide dimensional parameters (width, height, ridge positions) to transform the mode structure and polarization characteristics. By adjusting these parameters, the system achieves orthogonal E-field polarization while maintaining efficient power radiation, resolving the contradiction between polarization orientation and radiated power.
2Length of moving object
If waveguide width is narrowed to maintain individual slot antenna spacing at one-half wavelength with orthogonally reoriented slots, then slot spacing requirements are met, but radiated power is significantly attenuated due to cutoff
Solution Approach 1:
The patent modifies waveguide parameters including width, height, and ridge configurations to change the cutoff frequency characteristics. This allows the waveguide to maintain wider dimensions (avoiding cutoff) while still supporting the desired slot spacing and orthogonal polarization through transformed mode structures.
Solution Approach 2:
The patent employs a composite waveguide structure combining rectangular waveguide sections with ridge-modified sections. This composite approach allows different sections to perform different functions: maintaining power transmission in rectangular sections and enabling orthogonal polarization in ridge-modified sections, thus resolving the contradiction between spacing requirements and power radiation.
3Power
If slot antennas are moved from the narrow waveguide wall to the broad waveguide wall to maintain radiated power with orthogonal orientation, then radiated power is improved, but waveguide width must be narrowed to maintain slot spacing
Solution Approach 1:
The patent uses a composite waveguide structure where rectangular waveguide sections maintain wider dimensions for efficient power transmission, while ridge-modified sections enable orthogonal polarization. This allows slots to be positioned on broad walls for efficient radiation without requiring overall waveguide narrowing.
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
This configuration achieves efficient radiation with desired polarizations while avoiding cutoff frequencies, maintaining efficient radiated power and compatible slot antenna spacing.
Implementation Method 1
providing an offset-ridge waveguide functionally adjacent to the rectangular waveguide opposite the feed guide, and providing a single-mode first ridge waveguide functionally adjacent to the offset-ridge waveguide opposite the rectangular waveguide
Data Source
AI summary
An apparatus and method for orthogonal rotation of a radiation E-field polarization rely on a radiating element including an offset-ridge waveguide and a single-mode first ridge waveguide functionally adjacent to the offset-ridge waveguide.