Switchable Asymmetric Antenna for Consistent Radiation Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Communications terminal antennas experience varying performance due to differences in how they are held by the left or right hand or approached by the head, leading to inconsistent radiation efficiency and attenuation when in close proximity to human tissue.
Innovation Solution
A communications terminal with an asymmetric antenna structure and a single-pole double-throw switch that switches between two connection manners, allowing the antenna to maintain consistent performance regardless of the hand or head position by adjusting the electric field distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an asymmetric antenna structure (IFA or PIFA) is used, then the antenna can be integrated into the terminal, but the radiation efficiency and performance vary significantly when approached by left or right hand/head due to asymmetric electric field distribution
Solution Approach 1:
The patent applies asymmetry by introducing a switching mechanism that dynamically changes the antenna's electrical characteristics based on holding position. The switch connects different parasitic elements to the feed point, effectively creating different asymmetric configurations to match left-hand and right-hand holding scenarios, thereby resolving the performance inconsistency caused by the inherently asymmetric IFA/PIFA structure
Solution Approach 2:
The patent implements dynamics by making the antenna configuration changeable through a switching mechanism. The controller dynamically selects which parasitic element to connect based on detected holding position, transforming the antenna from a static asymmetric structure to a dynamic system that adapts its electrical characteristics to maintain consistent radiation efficiency regardless of which hand holds the terminal
2Adaptability or versatility
If the antenna structure is fixed, then the device complexity is reduced, but the performance differs when approached by left side of head or left hand versus right side of head or right hand
Solution Approach 1:
The patent applies segmentation by dividing the antenna system into multiple independent parasitic elements (first parasitic element and second parasitic element) that can be selectively connected to the feed point. This segmentation allows the controller to activate only the necessary element based on holding position, achieving performance consistency without requiring a completely complex reconfigurable antenna structure
Solution Approach 2:
The patent implements universality by designing a single antenna feed point that can connect to multiple different parasitic elements through the switching mechanism. This multi-functional feed point structure allows the same physical antenna system to serve different holding scenarios (left-hand and right-hand positions) without requiring separate antenna structures for each case
Data Source
Figure 1a
Figure 1b~2a
Figure 2b~2c
AI summary
The present invention provides a communications terminal, including a feed terminal, a ground terminal, an antenna, and a switch part, where the antenna is an asymmetric structure; the feed terminal is electrically connected to a feed circuit in the communications terminal, and the ground terminal is electrically connected to a ground end in the communications terminal; the switch part is configured to switch between a first connection manner and a second connection manner; the first connection manner includes electrically connecting the feed terminal to a first end of the antenna, and electrically connecting the ground terminal to a second end of the antenna; and the second connection manner includes electrically connecting the ground terminal to the first end of the antenna, and electrically connecting the feed terminal to the second end of the antenna. Technical solutions in embodiments of the present invention reduce a quantity of pads and ensure that impact on the antenna is the same when the terminal is approached by a left side of a head or by a left hand and when the terminal is approached by a right side of the head or by a right hand.