Compact Multi-Band Antenna Using Shared Resonant Conductive Members
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Solution Overview
Problem
Existing antennas struggle to operate across multiple frequency bands without occupying excessive space, as they either require a large bandwidth or multiple resonant structures, which can be bulky.
Innovation Solution
A compact antenna design comprising a ground plane, a first conductive member, and pairs of second and third conductive members forming resonant structures that resonate at different frequency bands, with galvanic isolation and specific electrical lengths to achieve efficient multi-band operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single resonant structure with large bandwidth or multiple resonant structures is used to operate across multiple frequency bands, then multi-band operation capability is improved, but antenna size and occupied space increase
Solution Approach 1:
The antenna is divided into multiple conductive members (first, second, third, and fourth conductive members) each serving specific frequency bands. The first conductive member resonates at lower frequency, while the second and third members form a magnetic dipole for mid-frequency, and the fourth member forms an electric dipole for higher frequency. This segmentation allows each element to be optimized for specific bands without requiring a single large structure.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement of conductive members with specific orientations. The magnetic dipole is formed by conductive members oriented in one direction, while the electric dipole uses members oriented perpendicularly. This dimensional arrangement enables multi-band operation within a compact volume by exploiting different spatial dimensions and orientations.
2Adaptability or versatility
If multiple resonant structures are used to cover multiple frequency bands, then frequency band coverage is improved, but device complexity increases
Solution Approach 1:
The patent combines magnetic dipole and electric dipole structures into a single integrated antenna system. The magnetic dipole is formed by the second and third conductive members, while the electric dipole is formed by the third and fourth conductive members. These two dipole structures share common conductive members and are integrated within the same ground plane structure, reducing overall complexity compared to separate antennas.
Solution Approach 2:
The third conductive member serves dual purposes: it forms part of the magnetic dipole structure for mid-frequency operation and simultaneously forms part of the electric dipole structure for higher frequency operation. This multi-functionality reduces the total number of separate components needed while achieving broad frequency coverage.
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 design allows for a compact antenna to efficiently operate across multiple frequency bands, including 2.4 GHz and 5.1 to 7.2 GHz, while maintaining a reduced size and efficient radiation patterns.
Implementation Method 1
the first conductive member is sized to resonate at a lower frequency band of the multiple frequency bands
Implementation Method 2
a pair of second conductive members forming, with the first conductive member, a resonant structure sized to resonate at a higher frequency band
Implementation Method 3
the pair of second conductive members form, with the first conductive member, a magnetic dipole
Implementation Method 4
a pair of third conductive members forming a resonant structure sized to resonate at a higher frequency band
Implementation Method 5
the pair of third conductive members form a half wavelength electric dipole
Data Source
Figure 1~2
Figure 3A~3B
Figure 4~5
AI summary
An antenna for operation across multiple frequency bands, the antenna comprising, in order, a ground plane; a first conductive member separated from the ground plane; a pair of second conductive members forming, with the first conductive member, a resonant structure sized to resonate at a higher frequency band of the multiple frequency bands; a pair of third conductive members forming a resonant structure sized to resonate at a higher frequency band of the multiple frequency bands; wherein the first conductive member is sized to resonate at a lower frequency band of the multiple frequency bands.