Radio Wave Shield with Selective Frequency Antennas
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Solution Overview
Problem
Conventional radio wave shielding techniques fail to selectively shield specific frequency bands, making it difficult to adjust radio wave environments in offices or buildings where equipment uses radio waves with fractional bandwidths greater than 10%, as they either shield all frequencies or are ineffective for specific frequency bands.
Innovation Solution
A radio wave shield comprising multiple T-Y type antennas made of conducting materials, with continuous spectrum peaks and a fractional bandwidth exceeding 10 dB, allowing for selective shielding of specific frequency bands by arranging antennas to maintain low frequency selectivity and high shielding factors across the desired frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional electromagnetic shielding material is used to shield radio waves, then all frequencies are shielded, but frequency selectivity is lost and radio waves of frequencies not to be shielded are also shielded
Solution Approach 1:
The shielding material is segmented into multiple types of antennas (first, second, and third kinds), each type being responsible for shielding radio waves of different frequency ranges. This segmentation allows the system to selectively shield specific frequency bands while preserving other frequencies, resolving the contradiction between shielding effectiveness and frequency selectivity.
2Adaptability or versatility
If Y-shaped linear antennas are periodically arranged to shield a specific frequency, then frequency selectivity is achieved, but the technique is ineffective for frequency bands with fractional bandwidth larger than 10%
Solution Approach 1:
Multiple types of antennas with different frequency characteristics are merged into a single shielding system. The first, second, and third kinds of antennas are combined such that their shielding frequency ranges overlap and connect, creating continuous shielding coverage across a wide frequency band (fractional bandwidth > 10%), thereby resolving the contradiction between frequency selectivity and wide bandwidth effectiveness.
3Adaptability or versatility
If multiple types of antennas with different frequency ranges are arranged, then frequency band shielding is achieved, but spectrum peaks become independent and coverage becomes discontinuous
Solution Approach 1:
The arrangement of antennas is optimized to create local overlap in their frequency response characteristics. By carefully positioning the first, second, and third kinds of antennas with respect to each other, the spectrum peaks of adjacent antenna types are made to connect continuously, ensuring stable and continuous shielding coverage across the entire target frequency band without gaps.
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 effectively shields radio waves within a specific frequency band, ensuring a high radio wave shielding factor and adjusting the radio wave environment in offices or buildings with equipment using broader frequency bands, while maintaining mechanical durability and flexibility.
Implementation Method 1
A radio wave shield that 'selectively shields radio waves of a specific frequency band' comprises a plurality of kinds of antennas respectively for selectively reflecting radio waves of different specific frequencies
Implementation Method 2
a plurality of kinds of antennas respectively for selectively reflecting radio waves of different specific frequencies
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A radio wave shield 1 includes three kinds of antennas 4a, 4b and 4c respectively for selectively shielding radio waves of specific different frequencies. The first antenna 4a, the second antenna 4b and the third antenna 4c have radio wave reflecting spectrum peaks continuous to one another.