Radiating Loop Coil for Multi-Band Antenna Transparency
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Solution Overview
Problem
Conventional antenna devices face issues of electrical visibility and performance degradation when radiating elements of different frequency bands are placed in close proximity, leading to distorted radiation, increased side lobes, and reduced directivity.
Innovation Solution
The antenna device incorporates a radiating loop formed as a coil on the second radiating structure, which introduces inductance along its circumference, making it electrically invisible to the first frequency band and reducing scattered fields, thereby maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If radiating elements of different frequency bands are placed in close proximity to increase antenna density, then the quantity of radiating structures increases, but electrical visibility causes performance degradation including distorted radiation and increased side lobes
Solution Approach 1:
The patent applies parameter changes by modifying the electrical characteristics of the lower frequency radiating elements through the addition of loading elements (such as inductive or capacitive components). These loading elements adjust the impedance and electrical length of the lower frequency elements, making them electrically invisible or transparent to the higher frequency signals, thereby eliminating the harmful interactions while maintaining high antenna density
Solution Approach 2:
The patent introduces loading elements as intermediary components between the lower frequency radiating elements and the higher frequency signals. These loading elements act as mediators that transform the electrical characteristics of the lower frequency elements, preventing them from reflecting or reradiating higher frequency signals in unwanted ways, thus protecting the higher frequency radiation performance
2Area of stationary object
If lower frequency antenna array is overlaid on higher frequency antenna array to share same area, then area utilization improves, but higher frequency radiation gets distorted due to electrical visibility
Solution Approach 1:
The patent modifies the electrical parameters of the lower frequency radiating elements by introducing loading elements that change their impedance and electrical length. This parameter change makes the lower frequency elements electrically transparent to higher frequency signals, allowing the higher frequency radiation pattern to maintain its intended shape and directionality without distortion from the overlaid lower frequency array
Solution Approach 2:
The patent converts the potentially harmful effect of lower frequency elements (which would normally reflect and distort higher frequency signals) into a beneficial transparent structure. By carefully designing the loading elements, the lower frequency elements become electrically invisible at higher frequencies, allowing the higher frequency array to operate as if the lower frequency elements were not present, thus enabling area sharing without radiation pattern degradation
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 radiating loop ensures mutual transparency between frequency bands, minimizing interference and maintaining radiation pattern integrity by reducing scattered fields to less than −50 dB.
Implementation Method 1
The radiating loop is made as a coil extending along the closed line and being electrically invisible at the first frequency band. The radiating loop is made as a coil such that an inductance is introduced that is distributed all along the radiating loop. Such inductance changes the impedance of the radiating loop, thereby reducing the amount of scattered field
Data Source
AI summary
An antenna device. The antenna device includes a first radiating structure that operates at a first frequency band. A second radiating structure operates at a second frequency band. The second radiating structure includes a radiating loop formed along a closed line, wherein the radiating loop is made as a coil extending along the closed line and is electrically invisible at the first frequency band. The second radiating structure operates at the second frequency band that does not affect the performance of the first radiating structure that operate at the first frequency band even when both radiating structures are placed in the vicinity of each other.