Waveguide Slot Antenna Surface Structure for Reflection Suppression
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Solution Overview
Problem
Waveguide slot antennas experience multiple reflections between the antenna body and objects in the radiation direction, leading to performance degradation in radar and communication devices due to unwanted noise components and narrowed frequency bands.
Innovation Solution
The waveguide slot antenna incorporates uneven sections on its outer wall surface with periodic concave-convex patterns or rectilinear ridges and grooves to reflect incident waves in a different direction, preventing multiple reflections without the need for a frequency selection surface unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a frequency selection surface unit is arranged forward of the waveguide slot antenna to suppress multiple reflections, then the target detection performance and communication performance are improved, but the device complexity and frequency band limitation increase
Solution Approach 1:
The invention extracts and removes the frequency selection surface unit from the antenna system. By eliminating this separate component, the patent achieves multiple reflection suppression through the waveguide slot antenna's own structure (slot arrangements and waveguide configurations), thereby improving reliability without increasing device complexity
Solution Approach 2:
The invention merges the multiple reflection suppression function into the waveguide slot antenna structure itself. The slot arrangements and waveguide configurations are designed to inherently suppress multiple reflections, combining what were previously separate functions (antenna radiation and reflection suppression) into a unified structure, thus avoiding additional components
2Reliability
If a frequency selection surface unit is arranged forward of the waveguide slot antenna to suppress multiple reflections, then the communication performance is improved, but the frequency band is narrowed
Solution Approach 1:
The invention changes the structural parameters of the waveguide slot antenna (slot dimensions, slot spacing, waveguide configurations) to achieve multiple reflection suppression. By adjusting these geometric parameters rather than using a frequency-selective filter, the antenna maintains broad frequency band adaptability while improving communication performance through inherent reflection suppression
3Power
If metal portions surround the slots in the waveguide slot antenna, then the radio wave transmission is efficient, but multiple reflections occur between the object and metal portions
Solution Approach 1:
The invention segments the continuous metal structure into discrete waveguide configurations with strategically positioned slots. This segmentation allows the metal portions to efficiently transmit radio waves while the slot arrangements interrupt the continuous reflection path, thereby reducing multiple reflections between the object and metal portions
Solution Approach 2:
The invention converts the harmful multiple reflections into beneficial radiation patterns. The slot arrangements are designed so that reflections from metal portions are redirected constructively, transforming what would be harmful interference into enhanced radiation in desired directions, thus maintaining transmission efficiency while suppressing unwanted reflections
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 design suppresses multiple reflections, maintains the frequency band and transmission/reception power, and enhances detection and communication accuracy by reducing unnecessary signal components.
Implementation Method 1
The uneven section is configured to reflect incident waves incident from forward in a direction of radiation of radio waves emitted from the radiating section, in a direction different from an incident direction of the incident waves
Data Source
AI summary
A waveguide slot antenna includes a waveguide having a plurality of slots spaced apart by a predefined distance in a central-axis direction of the waveguide, as a radiating section. An uneven section provided on an outer wall surface around the radiating section has a periodic concave-convex pattern extending from the radiating section. The uneven section includes a plurality of protrusions spaced apart by a predefined distance in a dispersed manner in each of an axis direction parallel to the central-axis of the waveguide in which the plurality of slots are arranged and an axis direction orthogonal to the central-axis of the waveguide, and grooves between the protrusions. The plurality of protrusions and the grooves causes incident waves incident from forward in a direction of radiation of radio waves emitted from the radiating section to be reflected in a direction different from an incident direction of the incident waves.