Coiled Radiating Loop for Multi-Band Antenna Transparency
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Solution Overview
Problem
Conventional antenna devices face challenges in achieving mutual electrical invisibility or transparency between radiating structures operating in different frequency bands, leading to performance degradation such as distorted radiation, increased side lobes, and reduced directivity.
Innovation Solution
The antenna device incorporates a second radiating structure with a radiating loop formed as a coil extending along a closed line, which introduces distributed inductance and changes the impedance of the radiating loop, making it electrically invisible at the first frequency band and thus maintaining performance without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radiating structures for different frequency bands are integrated in the same antenna device, then the antenna device can support multiple frequency bands, but the radiating structures become electrically visible to each other causing performance degradation
Solution Approach 1:
The patent introduces an electromagnetic band-stop filter as an intermediary component between radiating structures of different frequency bands. This filter acts as a mediator that blocks harmful electromagnetic interactions while allowing the radiating structures to coexist in the same antenna device, thus enabling multi-frequency band support without performance degradation
Solution Approach 2:
The patent modifies the electrical characteristics of the antenna device by introducing band-stop filters that change the electromagnetic parameter landscape. These filters create frequency-selective zones that prevent unwanted coupling between different frequency bands, allowing multiple radiating structures to operate simultaneously with maintained performance
2Adaptability or versatility
If more radiating structures are integrated under the same radome, then the antenna device can serve more frequency bands, but the electrical visibility between structures increases causing distorted radiation and increased side lobes
Solution Approach 1:
The electromagnetic band-stop filters serve as intermediary elements positioned between multiple radiating structures, blocking the harmful electromagnetic fields that would otherwise cause distortion and increased side lobes. This allows more frequency bands to be integrated without proportionally increasing interference
Solution Approach 2:
The patent converts the potentially harmful electromagnetic fields between radiating structures into beneficial frequency-selective filtering effects. By strategically placing band-stop filters, the electromagnetic interactions that would normally cause distortion are transformed into controlled frequency separation, enabling higher band integration with maintained radiation quality
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 solution achieves improved mutual invisibility and transparency between radiating structures operating in different frequency bands, reducing scattered fields to less than -50dB and maintaining radiation pattern integrity across frequency bands.
Implementation Method 1
a radiating loop formed along a closed line, wherein the radiating loop is made as a coil extending along the closed line
Implementation Method 2
introduces distributed inductance and changes the impedance of the radiating loop, making it electrically invisible at the first frequency band
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 1E~1F
AI summary
An antenna device includes a first radiating structure that operates at a first frequency band. The antenna device further includes a second radiating structure that operates at a second frequency band. The second radiating structure includes a radiating loop formed along a closed line, where the radiating loop is made as a coil extending along the closed line and is electrically invisible at the first frequency band. The antenna device manifests improved mutual electrical invisibility (or transparency) in which the second radiating structure that operates at the second frequency band do 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.