Dual-band Antenna with Shared Elements for Compact Wireless Devices
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Solution Overview
Problem
Existing wireless communication devices face challenges in miniaturization due to the need for multiple antennas to support multiple frequency bands, which increases the overall volume and makes it difficult to achieve a compact size while maintaining good radiation characteristics and sufficient bandwidth.
Innovation Solution
A compact dual-band antenna design featuring separated radiating strips on two planes of a circuit board, coupled via conductive vias to form a spiral radiating body, with a shared shorting and feeding element, allowing for efficient operation at both 2.4 GHz and 5 GHz bands within a reduced area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are provided to support multiple frequency bands, then the device can transmit/receive signals at multiple frequency bands, but the overall volume of the wireless communication device increases
Solution Approach 1:
The patent combines two antennas operating at different frequency bands (2.4GHz and 5GHz) into a single integrated antenna structure. The first antenna includes radiating portions on both upper and lower surfaces of the circuit board, while the second antenna uses a shared radiating plane, allowing dual-band operation within a compact footprint and reducing overall device volume.
Solution Approach 2:
The radiating plane serves multiple functions: it acts as the radiating element for the second antenna operating at 5GHz, while simultaneously serving as part of the ground structure for the first antenna operating at 2.4GHz. This multi-functional design enables single-structure dual-band operation, eliminating the need for separate antenna structures for each frequency band.
2Volume of moving object
If the antenna structure is compacted to reduce volume, then the device size is reduced, but the radiation characteristic and operation bandwidth may be compromised
Solution Approach 1:
The patent transitions from a two-dimensional planar antenna design to a three-dimensional structure by placing radiating portions on both the upper and lower surfaces of the circuit board and using vias to connect them. This vertical dimensionality allows the antenna to achieve sufficient radiation performance and bandwidth in a compact horizontal footprint, resolving the contradiction between size reduction and radiation quality.
3Adaptability or versatility
If multiple separate antennas are used for dual-band operation, then each antenna can be optimized for its frequency band, but the space required for arranging multiple antennas increases
Solution Approach 1:
The patent implements a nested structure where the second antenna's radiating plane is integrated within the same space occupied by the first antenna's radiating portions. The radiating plane is positioned to overlap with or adjacent to the first antenna's radiating elements, allowing both antennas to coexist in a minimal area without significant spatial separation.
Data Source
AI summary
A dual-band antenna is disclosed including: a first antenna comprising: a first radiating portion including a plurality of separated radiating strips positioned on a first plane of a circuit board; a second radiating portion including a plurality of separated radiating strips positioned on a second plane of the circuit board; and a plurality of vias for coupling the plurality of radiating strips on the first plane with the plurality of radiating strips on the second plane to form a spiral radiating body; a second antenna having a radiating plane coupled with the first radiating portion or the second radiating portion; a shorting element coupled with the radiating plane and shared by the first and second antennas; and a feeding element coupled with the radiating plane and shared by the first and second antennas; wherein the width of part of the radiating plane gradually increases along a direction.