Microstrip Antenna Tapered Ground Edge Diffracted Wave Reduction
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Solution Overview
Problem
Existing microstrip antennas in in-vehicle millimeter-wave radars face increased costs and limited frequency bands due to the use of radio wave absorbers and passive elements to reduce diffracted waves, which also restrict their ability to handle multiple channels effectively.
Innovation Solution
A microstrip antenna design featuring a ground conductor with tapered tip ends along its edges, reducing diffracted waves without the need for additional materials or processes, thereby maintaining cost efficiency and supporting multi-channel operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If radio wave absorbers are applied or attached on edges of antenna substrate, then diffracted waves are reduced, but manufacturing cost increases due to extra materials and processes
Solution Approach 1:
The invention extracts and eliminates the need for separate radio wave absorber materials by integrating the diffracted wave reduction function directly into the ground conductor structure through tapered tip ends, thereby removing the harmful factor without adding external materials or processes
Solution Approach 2:
The invention merges the ground conductor structure with the diffracted wave reduction function by incorporating tapered tip ends directly into the ground conductor, combining multiple functions into a single integrated component and eliminating the need for separate radio wave absorber materials
2Object-affected harmful factors
If passive elements are provided on edges of antenna substrate with width of one-half wavelength, then diffracted waves are reduced through phase cancellation, but frequency band is limited and device complexity increases
Solution Approach 1:
The invention extracts and eliminates the need for separate passive elements by integrating the diffracted wave reduction function directly into the ground conductor structure, thereby reducing device complexity while maintaining the harmful factor reduction effect
Solution Approach 2:
The tapered ground conductor structure serves multiple functions simultaneously: it acts as both the ground conductor for antenna operation and the diffracted wave reduction structure, enabling multi-functionality without adding separate components or limiting frequency band
3Object-affected harmful factors
If passive elements are provided on edges of antenna substrate, then diffracted waves are reduced, but receiving antenna is designed for only single channel and adaptability decreases
Solution Approach 1:
The integrated tapered ground conductor structure provides universal applicability across multiple channels and frequency bands, allowing the antenna system to handle multi-channel operations without being restricted to single-channel designs
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 solution effectively minimizes diffracted waves at the edges of the ground conductor, enhancing radar detection performance, particularly angle measurement accuracy, while preventing cost increases and accommodating wider horizontal-plane beam widths.
Implementation Method 1
diffracted waves generated at edges of a ground conductor
Data Source
AI summary
In a microstrip antenna in which a ground conductor is provided to be opposed to patch conductors, wedge shapes angled to intersect with an antenna polarization plane are provided at edges of the ground conductor in a repeated manner.