Folded Dual-Band Antenna with Narrow Gap for High-Frequency Efficiency
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Solution Overview
Problem
Dual-band antennas with folded conductors often experience efficiency deterioration in high-frequency bands due to folding, which affects communication performance.
Innovation Solution
Incorporating a narrow gap part between the folded antenna conductor's linear parts and an LC resonant circuit that attenuates high-frequency signals while passing low-frequency signals, with the LC circuit positioned in the narrow gap area, and a feeding point between the ground and folded antenna conductors to enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a folded antenna conductor is used to downsize the dual-band antenna, then the antenna size is reduced, but the antenna efficiency in the high-frequency band deteriorates
Solution Approach 1:
The patent introduces a narrow gap part at a specific location between the first linear part and second linear part of the folded antenna conductor. This local structural modification creates a concentrated capacitance effect precisely where needed, improving high-frequency band efficiency without affecting other parts of the antenna. The narrow gap part has a width smaller than other portions of the antenna conductor, creating a localized property change that addresses the efficiency deterioration issue.
2Object-generated harmful factors
If an LC parallel circuit is added as a band elimination filter, then high-frequency signals are attenuated, but the device complexity increases
Solution Approach 1:
The patent combines the band elimination filter function with the antenna conductor itself by forming an LC parallel circuit using the antenna conductor's own structure. The narrow gap part provides the capacitive element, while the inductor is integrated into the folded antenna conductor path. This merging approach allows the antenna to simultaneously serve as both the radiating element and the filtering structure, eliminating the need for separate filter components and reducing overall device complexity.
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 reduces antenna efficiency degradation in high-frequency bands, improving communication performance by effectively filtering out high-frequency interference and maintaining signal strength across both frequency bands.
Implementation Method 1
an LC resonant circuit that is included in the folded antenna conductor, that passes the first frequency, and that attenuates the second frequency
Implementation Method 2
A narrow gap part is provided between the first linear part and the second linear part of the folded antenna conductor, the narrow gap part measuring a distance shorter than a distance measured in a different portion between the first linear part and the second linear part
Data Source
AI summary
A dual-band antenna device allowed to perform communication at a first frequency in a predetermined frequency band and at a second frequency in a frequency band higher than the predetermined frequency band includes: a ground conductor; a folded antenna conductor including a first linear part and a second linear part that are caused to face each other at a distance by folding; an LC resonant circuit that is included in the folded antenna conductor, that lets the first frequency pass, and that lets the second frequency attenuate; and a feeding point between the ground conductor and the folded antenna conductor. A narrow gap part is provided between the first linear part and the second linear part of the folded antenna conductor, the narrow gap part measuring a distance shorter than a distance measured in a different portion between the first linear part and the second linear part.