Multiband Antenna Design for Bluetooth and Wi-Fi Compatibility
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Solution Overview
Problem
Current antennas with reduced dimensions fail to maintain compatibility with both BLUETOOTH and IEEE 802.11a/b/g standards due to narrowing frequency bands, necessitating a multiband antenna design that covers 2.4 GHz and 5.18 GHz to 5.825 GHz frequency ranges effectively.
Innovation Solution
A multiband antenna design comprising a substrate with a feed portion, radiating portion, and short portion, featuring L-shaped and planar inverted F antenna configurations, which includes first, second, and third radiators connected through ground vias and slots to enhance coupling and impedance matching across the required frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antenna dimensions are reduced, then device size is decreased, but frequency band coverage is narrowed
Solution Approach 1:
The antenna is divided into multiple independent radiating elements (first radiating element for 2.4 GHz, second radiating element for 5 GHz) that can be configured separately. Each element is optimized for specific frequency bands, allowing the overall antenna to cover multiple bands while maintaining compact dimensions. The radiating elements can be independently activated based on which frequency band is needed.
Solution Approach 2:
The patent utilizes three-dimensional space by positioning radiating elements at different heights and orientations within the antenna housing. The first and second radiating elements are arranged in different spatial dimensions, allowing them to operate at different frequencies without interfering with each other. This vertical and spatial arrangement enables multi-band coverage in a compact footprint.
2Adaptability or versatility
If single-frequency antenna design is used, then design complexity is reduced, but compatibility with multiple standards is lost
Solution Approach 1:
The antenna is designed as a universal multi-functional device that can operate with both BLUETOOTH (2.4 GHz) and IEEE 802.11a/b/g (2.4 GHz and 5 GHz) standards. The first radiating element handles 2.4 GHz operations for both standards, while the second radiating element provides 5 GHz capability for IEEE 802.11a. This multi-functional design allows a single antenna to replace what would traditionally require multiple separate antennas.
Solution Approach 2:
Multiple radiating elements that would traditionally be separate antennas are merged into a single integrated antenna structure. The first and second radiating elements are combined within one antenna housing and share common feeding structures and control circuitry. This merging reduces the overall device complexity compared to using separate antennas for different frequency bands while maintaining compatibility with multiple wireless standards.
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 achieves return loss of less than −10 dB across the frequency bands, ensuring compatibility with BLUETOOTH and IEEE 802.11a/b/g standards while maintaining reduced dimensions, effectively addressing the challenge of frequency band coverage.
Implementation Method 1
The radiating portion (30) comprises a first radiator (31), a second radiator (32) and a third radiator (33)... to transceive electromagnetic signals
Implementation Method 2
The first radiator (31)... to transceive the first frequency signal... The second radiator (32)... to transceive the second frequency signal... The third radiator (33)... to transceive the second frequency signal
Implementation Method 3
the radiating portion (30) connected to a ground portion through the ground via (50)
Implementation Method 4
The first horizontal section (312) and the second horizontal section (322) extend toward to each other so that the second horizontal section (322) and the first horizontal section (312) partially overlap, and define a slot (70) therebetween
Data Source
AI summary
A multiband antenna includes a feed portion, a radiating portion, and a ground via. The feed portion includes a first feed section and a second feed section paralleled to each other. The radiating portion includes a first radiator, a second radiator and a third radiator. The first radiator is L shaped with a free end. The second radiator is L shaped with a free end. The free ends of the second radiator and the first radiator extend toward to each other and partially overlap to define a slot therebetween. The third radiator includes a trapezoid section and a connecting section. The short portion includes a first short section and a second short section. The first short section connects the first radiator to the ground via, and the second short section connects the second radiator and the third radiator to the ground via.