Waveguide Slot Array Antenna Reflection Suppression
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Solution Overview
Problem
In waveguide slot array antennas, suppressing reflections from radiating elements while maintaining efficient electromagnetic wave coupling is challenging, as arranging reflection-suppressing posts or slot pairs can lead to physical interference and reduced antenna performance.
Innovation Solution
The antenna apparatus is designed with first and second array elements positioned based on coupling power ratios, where the first array element has a reflection-suppressing post and the second array element has a pair of slots, allowing for independent reflection suppression and improved antenna characteristics without physical interference, using a traveling wave excitation type and uniform excitation distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a post is arranged near the slot to suppress reflection, then reflection from the slot is reduced, but the post physically interferes with the waveguide wall when coupling power ratio is high
Solution Approach 1:
The patent applies local quality by differentiating the treatment of array elements based on their coupling power ratios. First array elements with coupling power ratios of 5% or more use reflection-suppressing posts, while second array elements with coupling power ratios less than 5% use slot pairs. This localized differentiation resolves the contradiction by matching the reflection suppression method to the specific operational conditions of each array element position.
2Reliability
If slots are arranged in pairs to suppress reflection, then reflection from slots is reduced, but the slot interval excessively decreases or slots overlap when coupling power ratio is high
Solution Approach 1:
The patent applies local quality by differentiating the treatment of array elements based on their coupling power ratios. First array elements with coupling power ratios of 5% or more use reflection-suppressing posts, while second array elements with coupling power ratios less than 5% use slot pairs. This localized differentiation resolves the contradiction by matching the reflection suppression method to the specific operational conditions of each array element position.
3Reliability
If reflection suppression elements are added to all array elements, then reflection is suppressed, but device complexity increases
Solution Approach 1:
The patent applies partial action by selectively applying reflection suppression measures only where needed. Array elements are divided into two groups: those requiring posts (coupling power ratio ≥5%) and those requiring slot pairs (coupling power ratio <5%). This partial application approach resolves the contradiction by implementing reflection suppression selectively rather than universally, reducing overall device complexity while maintaining effectiveness.
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 effectively suppresses reflections and enhances antenna performance by optimizing the placement of array elements based on coupling power ratios, ensuring uniform excitation and maximum antenna gain.
Implementation Method 1
arrange a post near the slot and cancel reflection from the slot by reflection from the post
Implementation Method 2
cancel reflection from the slot by reflection from the post
Implementation Method 3
a plurality of slots are formed in a waveguide, and electromagnetic waves are radiated from these slots
Data Source
AI summary
According to one embodiment, an antenna apparatus includes a waveguide is formed one or more first array elements and one or more second array element, each of the one or more first array elements being formed at a position where a coupling power ratio is no less than a threshold and including a first slot and at least one reflection suppressing element which suppresses a reflection from the first slot, each of the one or more second array elements being formed at a position where the coupling power ratio is less than the threshold and including a second slot and a third slot, the coupling power ratio indicating a ratio of an electric power supplied to each of the first and second array element to an electric power of electromagnetic wave radiated from the each of the first and second array element.