Dual-Notch Antenna Impedance Bandwidth for Vehicle Radar
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Solution Overview
Problem
Vehicle radar systems face challenges in designing efficient microstrip antenna arrays due to space limitations and high frequency operation, particularly in achieving optimal impedance match and bandwidth, especially at frequencies like 24 GHz, where signal reflection is a concern.
Innovation Solution
A dual-notch antenna design featuring a rectangular radiation member with concavely disposed notches on its lateral sides and microstrip lines connected to the feeding side, allowing for optimal impedance matching and increased bandwidth by adjusting the feeding impedance and forming a string array configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional microstrip antenna design is used, then the antenna can be integrated into the vehicle bumper, but the impedance bandwidth is insufficient and signal reflection occurs at 24 GHz
Solution Approach 1:
The radiation member is divided into multiple segments by introducing notches on its lateral sides. These notches create multiple current paths and resonant modes, effectively segmenting the current distribution to broaden the impedance bandwidth while maintaining good impedance match across a wider frequency range.
Solution Approach 2:
Notches are asymmetrically positioned on the lateral sides of the radiation member, creating asymmetric current distribution patterns. This asymmetry introduces additional resonant modes and improves impedance matching by reducing signal reflection at the operating frequency of 24 GHz.
2Measurement precision
If the antenna operates at high frequency (24 GHz), then the radar system achieves better resolution, but the available space for antenna design is limited
Solution Approach 1:
The antenna design transitions from a simple planar structure to a multi-dimensional configuration by adding notches that create vertical current paths and multiple resonant layers. This dimensional complexity allows the antenna to achieve wide bandwidth and good impedance match within a compact footprint suitable for vehicle bumper integration.
Solution Approach 2:
The notches modify the electrical parameters of the radiation member by changing the current distribution patterns and resonant frequencies. This parameter modification enables the antenna to operate efficiently at 24 GHz with broad bandwidth while maintaining a compact physical size.
3Adaptability or versatility
If a concave structure is added to the radiation element to increase bandwidth, then the bandwidth improves, but the structure becomes unsuitable for antenna array configuration
Solution Approach 1:
The radiation member is segmented into multiple sections by notches, creating a modular structure that maintains regularity. This segmented design broadens impedance bandwidth while preserving the geometric consistency needed for array configuration, as each element can be identically replicated.
Solution Approach 2:
The notches are positioned at specific locations on the radiation member to locally modify current distribution without affecting the overall structural regularity. This localized modification achieves bandwidth enhancement while maintaining the global symmetry required for phased array operations.
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 dual-notch antenna design effectively increases impedance bandwidth and optimizes radiation patterns, reducing signal reflection and improving antenna performance across a wider frequency range, as demonstrated by the expanded bandwidth from 23.9592 GHz to 24.4017 GHz at 24 GHz operational frequency.
Implementation Method 1
one end of each microstrip line electrically connected with the feeding side of the two notches, respectively... an optimal impedance match is provided, thus avoiding signal reflection
Implementation Method 2
a radiation member formed in a rectangular shape... the dual-notch antenna design effectively increases impedance bandwidth and optimizes radiation patterns
Data Source
AI summary
A dual-notch antenna includes a radiation member and two microstrip lines. The radiation member is formed in a rectangular shape, with two first lateral sides disposed in opposite, and two second lateral sides disposed on two ends of the two first sides, respectively. The middle section of each first lateral side is concavely provided with a notch. Each notch has a feeding side and two cove sides, wherein the feeding side is disposed in parallel to the first lateral sides. The two cove sides are connected with two ends of the feeding side. Each microstrip line has one end thereof electrically connected with the feeding side of the corresponding notch, respectively.