Patch Antenna Structure for Wideband 77-81 GHz Blind Spot Radar
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Solution Overview
Problem
Conventional ultra short range radar (USRR) patch antennas have limitations in bandwidth and beam width, failing to effectively perform blind spot detection due to adjacent resonances of main and parasitic elements, which restricts their ability to achieve the required 77 GHz to 81 GHz bandwidth and 150° beam width.
Innovation Solution
A patch antenna design featuring a first radiator with a specific shape and a second radiator of different size and shape, spaced apart by a predetermined distance, along with a power feeder, to expand the resonance band and achieve the desired bandwidth and beam width, with the second radiator acting as a parasitic element to enhance frequency operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional USRR patch antennas use a single radiator, then the device complexity is low, but the bandwidth is limited and cannot achieve the required 77 GHz to 81 GHz range
Solution Approach 1:
The antenna is divided into multiple radiators with different shapes and sizes, each contributing to different frequency bands. The first radiator has a first shape and the second radiator has a second shape, allowing them to resonate at different frequencies and expand the overall bandwidth to cover 77 GHz to 81 GHz
Solution Approach 2:
Multiple radiators are combined in a single antenna structure, where the first radiator and second radiator work together to provide both wide bandwidth and wide beam width characteristics, achieving the required 150° beam width while maintaining bandwidth from 77 GHz to 81 GHz
2Device complexity
If conventional USRR patch antennas use a plurality of radiators with adjacent resonance, then the device complexity increases, but the bandwidth expansion is insignificant and the beam width is only about 100°
Solution Approach 1:
Each radiator is designed with specific local characteristics - the first radiator has a first shape optimized for certain frequency ranges while the second radiator has a second shape optimized for other ranges. This local optimization allows each element to contribute differently to the overall beam width, achieving more than 150° beam width
Solution Approach 2:
The radiators are designed with asymmetric shapes and different sizes rather than identical symmetric elements. The first radiator and second radiator have different geometries that create complementary radiation patterns, enabling the beam width to exceed 150° while maintaining wide bandwidth coverage
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 design achieves a bandwidth ranging from 77 GHz to 81 GHz and a beam width of more than 150°, surpassing the limitations of conventional USRR patch antennas, enabling effective blind spot detection.
Implementation Method 1
resonance of a main radiator and resonance of a parasitic element adjoin each other to expand a bandwidth
Data Source
AI summary
A patch antenna includes: a substrate; a first radiator disposed on the substrate and having a first shape; a second radiator disposed on the substrate while being spaced a predetermined distance apart from the first radiator, and having a second shape; and a power feeder which supplies a power feed signal to the first radiator, wherein the first radiator includes a first outer edge portion straightly formed in the horizontal direction and second outer edge portions vertically formed from both ends of the first outer edge portion.