Radar Antenna Parasitic Elements Peripheral Illumination
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Solution Overview
Problem
Radar antennas with spherical radiation characteristics face challenges in illuminating peripheral regions effectively due to insufficient illumination, which existing technologies fail to address without altering the radiation pattern.
Innovation Solution
The use of parasitic elements, arranged relative to the antenna's spatial position and phase position of radiated energies, allows for improved radiation characteristics by broadening and focusing the signal in peripheral regions, particularly in microstrip technology, enabling better illumination through mutual coupling and radome influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If separate directing elements are used to improve radiation characteristics, then illumination in peripheral regions can be enhanced, but the spherical radiation characteristics are compromised and device complexity increases
Solution Approach 1:
Parasitic elements are introduced as intermediary components that indirectly influence the radiation characteristics of the main antenna. These elements couple with the main antenna through electromagnetic fields to reshape the radiation pattern without requiring direct control or complex integration, thus enhancing peripheral illumination while maintaining system simplicity
Solution Approach 2:
The radiation characteristics are modified by changing the parameters of the parasitic elements (such as their position, size, and orientation) rather than fundamentally altering the main antenna structure. This allows for adjustable radiation patterns including broadening and focusing effects while keeping the base antenna design intact
2Adaptability or versatility
If parasitic elements are added to broaden and focus radiation characteristics, then radiation pattern control is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The antenna system is segmented into a main antenna and separate parasitic elements that can be independently designed, positioned, and manufactured. This modular approach allows for simplified manufacturing of each component while achieving complex overall radiation characteristics through their coordinated arrangement
Solution Approach 2:
The parasitic elements automatically adjust the radiation pattern through their inherent electromagnetic coupling with the main antenna without requiring active control mechanisms. Their passive nature simplifies manufacturing while providing adaptive radiation characteristics based on their spatial configuration
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 approach enhances radiation characteristics, allowing for optimal illumination in peripheral zones and aligning with application profiles, particularly in the 70-80 GHz frequency range, improving position and speed determination of objects.
Implementation Method 1
the parasitic elements change the radiation characteristics of the antenna to be influenced by mutual coupling to one another and/or by mutual coupling with said antenna
Implementation Method 2
by using the geometric form of the radome, the radiation characteristics of the radar antennas can also be influenced, and in particular coupling, as described for example in claim 6, can additionally be brought about
Data Source
AI summary
A radar antenna includes parasitic elements for influencing the radiation characteristics of the radar antenna, the radiation characteristics of the radar antenna being dependent upon the spatial position of the parasitic elements relative to the radar antenna and phase positions (φ1, φ2, φ3) of energies radiated off the radar antenna and the parasitic elements. The radar antenna is designed using microstrip technology.