Coprime Spaced Antenna Array for Interference Reduction
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Solution Overview
Problem
High-frequency electronic apparatuses with closely spaced antenna elements suffer from interference issues, leading to deteriorated image quality, increased transmission/reception time, and longer calculation times due to the need for a large number of antenna elements when using MIMO methods.
Innovation Solution
The electronic apparatus employs a two-dimensional array antenna with antenna elements arranged at positions separated by multiples of half-wavelength, using coprime spacings to reduce interference and the number of elements, allowing for shorter transmission/reception times and reduced data processing requirements while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna elements are separated by half of a wavelength to reduce interference, then the number of antenna elements required increases, but this leads to longer transmission/reception time and increased data amount
Solution Approach 1:
The patent changes the spacing parameter from the conventional half-wavelength to a larger value (greater than half-wavelength), which reduces the number of antenna elements needed while maintaining acceptable image quality through optimized array geometry
Solution Approach 2:
The patent uses fewer antenna elements than the conventional half-wavelength spacing would require, accepting partial sampling in exchange for reduced system complexity and faster operation
2Reliability
If antenna elements are separated by half of a wavelength, then interference between adjacent antenna elements is reduced, but the number of antenna elements required increases greatly
Solution Approach 1:
The patent changes the spacing parameter from half-wavelength to a larger value, reducing the number of antenna elements from what would be required at half-wavelength spacing to a manageable number while maintaining imaging capability
Solution Approach 2:
The patent divides the antenna array into multiple subarrays with different spacing configurations, allowing each subarray to use fewer elements while the combined data from all subarrays provides sufficient sampling for image reconstruction
3Area of stationary object
If extra high frequency is used to reduce antenna element spacing, then the physical size of the array is reduced, but interference between adjacent antenna elements increases
Solution Approach 1:
The patent changes the spacing parameter to be greater than half-wavelength, which compensates for the reduced physical scale by ensuring adequate separation between elements even at extra high frequencies, thereby maintaining image quality
4Area of stationary object
If a great number of antenna elements are used to maintain spacing at extra high frequency, then the antenna array can cover the required area, but the data amount of reception signals increases
Solution Approach 1:
The patent changes the spacing parameter to reduce the total number of antenna elements required, which directly reduces the amount of reception data that must be processed while still covering the necessary spatial area for imaging
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 configuration results in improved image quality, reduced transmission/reception time, and decreased data processing time, enabling efficient three-dimensional imaging without the interference typically associated with closely spaced antenna elements.
Implementation Method 1
acquire a signal obtained by both transmitting an electromagnetic wave from any of the antenna elements and receiving, by any of the antenna elements, the electromagnetic wave reflected by an object
Data Source
AI summary
According to one embodiment, an electronic apparatus comprises antenna elements and processor circuitry. The antenna elements are arranged respectively at least at first, second, third, and fourth positions. The first and second positions are arranged in a first direction. Spacing between the first positions and spacing between the second positions are coprime. The third and fourth positions are arranged in a second direction. Spacing between the third positions and spacing between the fourth positions are coprime.