Multi-band Antenna Using Overlapped Capacitor Structure
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Solution Overview
Problem
Conventional built-in antenna apparatuses in communication terminals resonate at a relatively narrow frequency band, limiting their ability to support multiple wireless communication services due to size constraints, making it difficult to achieve a multi-band frequency capability within a compact form factor.
Innovation Solution
A multi-band antenna apparatus with a Pattern Overlapped Capacitor Antenna (POCA) structure, featuring a substrate body with a dielectric plate, a power supply line, a radiation line, and a ground plate, where the radiation line is separated from the power supply line to form an overlapping area that determines the frequency band, allowing for electromagnetic coupling and resonance across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a built-in antenna apparatus is used within the communication terminal, then the antenna can be integrated within the terminal, but the antenna resonates at a relatively narrow frequency band
Solution Approach 1:
The antenna apparatus is segmented into distinct functional components: a power supply line for feeding signals, a radiation line for electromagnetic radiation, and a ground line for grounding. These segments are arranged in an overlapped capacitor structure where the power supply line and radiation line are separated by a dielectric plate, creating multiple resonant paths that enable multi-band operation without requiring multiple separate antenna elements
Solution Approach 2:
The patent transitions from planar two-dimensional antenna designs to a three-dimensional overlapped capacitor structure. The power supply line and radiation line are positioned at different heights separated by a dielectric plate, creating vertical stacking. This dimensional change allows electromagnetic coupling between the lines while maintaining compact footprint, enabling multi-frequency resonance within a small area
2Adaptability or versatility
If multiple antenna devices are provided to extend frequency band, then the frequency band can be extended, but the size of the communication terminal cannot be decreased
Solution Approach 1:
The patent merges the functions of multiple antenna elements into a single integrated apparatus. The power supply line and radiation line are electromagnetically coupled through the dielectric plate, creating a unified structure that resonates at multiple frequency bands. This consolidation eliminates the need for separate antenna devices while maintaining multi-band capability, thereby reducing terminal size
Solution Approach 2:
The single antenna apparatus is designed to perform multiple functions across different frequency bands simultaneously. By adjusting the overlapping area between the power supply line and radiation line, the same structural configuration can resonate at various frequencies (LTE, CDMA, GSM, EGSM, DCS, PCS bands), making the antenna universally applicable for diverse wireless communication services without requiring additional antenna elements
3Adaptability or versatility
If the overlapping area between power supply line and radiation line is increased, then the frequency band can be adjusted, but the antenna structure becomes more complex
Solution Approach 1:
The patent employs parameter changes to achieve frequency band adjustment. By varying the overlapping area between the power supply line and radiation line, the capacitive coupling strength changes, which directly affects the resonant frequency. This continuous parameter adjustment mechanism allows flexible frequency tuning without requiring discrete structural modifications or additional components, maintaining structural simplicity while achieving adaptability
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 antenna apparatus effectively resonates across multiple frequency bands, including LTE, CDMA, GSM, EGSM, DCS, and PCS, enabling efficient multimedia services while maintaining a compact size, with adjustable characteristics to fine-tune performance and bandwidth.
Implementation Method 1
a power supply line, disposed at the substrate body and connected to an external power source, for forming an electromagnetic field when power is supplied from the external power source
Implementation Method 2
a radiation line, separated from the power supply line using the dielectric plate as a boundary in the substrate body, for forming an overlapping area overlapped with the power supply line along one axis through at least an end portion, and for resonating in a frequency band determined according to the overlapping area when the electromagnetic field is formed
Implementation Method 3
a radiation line, separated from the power supply line using the dielectric plate as a boundary in the substrate body, for forming an overlapping area overlapped with the power supply line
Implementation Method 4
a ground plate, disposed in at least one of both surfaces of the substrate body, for grounding the radiation line while having contact with the radiation line
Data Source
AI summary
A multi-band antenna apparatus using a multiple frequency band is provided. The apparatus includes a substrate body formed in a flat plate structure having a preset thickness and in which at least one dielectric plate is stacked, a power supply line, disposed at the substrate body and connected to an external power source, for forming an electromagnetic field when power is supplied from the external power source, a radiation line, separated from the power supply line using the dielectric plate as the boundary in the substrate body, for forming an overlapping area overlapped with the power supply line along one axis through at least a portion, and for resonating in a frequency band determined according to the overlapping area when the electromagnetic field is formed, and a ground plate disposed in at least one an upper ground area and a lower ground area of the substrate body, for grounding the radiation line by contacting with the radiation line.