Multi-band Antenna Using Capacitor Assembly for Size Reduction
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Solution Overview
Problem
Conventional antennas for terminal devices require larger space due to increased cabling and parasitic elements to achieve multiple bands, conflicting with the trend of miniaturization and portability demands.
Innovation Solution
A multi-band antenna design utilizing a capacitor assembly and matching network between the feedpoint and radiation portion, enabling two resonance frequencies in a CRLH mode to reduce antenna size without increasing space, thereby adapting to miniaturized terminal devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple branches or parasitic elements are added to achieve multiple bands, then the antenna can cover more frequency bands, but the antenna occupies larger space
Solution Approach 1:
The patent changes the electrical parameters of the antenna by introducing a capacitor assembly and matching network, transforming the antenna's resonance characteristics to achieve multiple bands without adding physical branches or parasitic elements. The capacitor assembly modifies the impedance and resonance frequency of the radiating element, enabling multi-band operation within the same physical structure.
Solution Approach 2:
The capacitor assembly acts as an intermediary component between the feedpoint and the radiating element, mediating the electrical connection to achieve multi-band resonance. This intermediary component enables the antenna to support multiple frequency bands by introducing additional resonance paths without requiring additional radiating structures.
2Adaptability or versatility
If conventional antenna structures are used to achieve multiple bands, then the antenna can provide multiple resonance frequencies, but the cabling space increases
Solution Approach 1:
The patent merges the matching network and capacitor assembly into a compact integrated structure that is directly coupled to the radiating element. This integration eliminates the need for separate cabling and connecting structures, reducing the overall cabling space while maintaining the multiple resonance frequency capability through the combined electrical structure.
3Adaptability or versatility
If the quantity of branches is increased to achieve more bands, then the antenna can cover more frequency ranges, but larger space is occupied
Solution Approach 1:
The single radiating element with the capacitor assembly and matching network performs multiple functions by supporting multiple resonance frequencies. Instead of requiring separate branches for different bands, this universal structure achieves multi-band coverage through electrical tuning and resonance manipulation, significantly reducing the antenna volume.
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 allows for multiple resonance frequencies while significantly reducing antenna size, accommodating the miniaturization trend and enhancing portability without the need for additional branches or parasitic elements.
Implementation Method 1
A first resonant circuit is formed from the feedpoint to the grounding portion, and the first resonant circuit generates a first resonance frequency and a second resonance frequency
Implementation Method 2
one resonance frequency is used in a CRLH mode, so that two resonance frequencies can be provided on the basis of reducing an antenna size
Data Source
Figure 1A~2B
Figure 3A~5B
Figure 5C~6
AI summary
Embodiments of the present invention provide a multi-band antenna and a terminal device. The multi-band antenna includes: a feedpoint, a matching network, a capacitor assembly, a radiation portion, and a grounding portion. The feedpoint, the matching network, the capacitor assembly, the radiation portion, and the grounding portion are connected in sequence. The matching network includes at least a serially-connected inductor and a grounded capacitor or inductor. The grounding portion is electrically connected to a ground plane. A first resonant circuit is formed from the feedpoint to the grounding portion. The first resonant circuit generates a first resonance frequency and a second resonance frequency. The first resonance frequency is used in a CRLH mode, and the second resonance frequency is used in a half-wavelength loop mode.