Edge Slot Antenna Layout to Reduce Hand-Induced Signal Attenuation
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Solution Overview
Problem
Hand contact with a handheld wireless communication device can disrupt or attenuate electromagnetic signal transmission and reception due to human tissue acting as an electrical conductor, posing safety concerns and violating FCC safety limits for RF exposure.
Innovation Solution
A slot antenna design is implemented on a wireless communication device with a conductive strip and slots positioned on the edges of the housing, particularly on the bottom edge, to minimize hand contact and meet FCC safety requirements by directing EM radiation away from the user's body, eliminating the need for a dielectric covering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna is positioned on the device housing, then wireless signal transmission and reception is enabled, but hand contact with the device disrupts or attenuates the electromagnetic signals
Solution Approach 1:
The patent positions the antenna on the lateral edge of the device housing rather than on the top or front surfaces, utilizing the vertical/dimensional space along the side edges. This dimensional repositioning places the antenna in a location that is naturally less likely to be contacted by the user's hand during normal operation, thereby reducing signal attenuation while maintaining wireless communication functionality
Solution Approach 2:
The patent applies different functional zones to different parts of the device housing, specifically designating the lateral edges as antenna zones that are electrically conductive and optimized for RF signal transmission, while other surfaces serve different functions. This local differentiation ensures that the antenna operates in a dedicated zone less susceptible to hand contact interference
2Object-affected harmful factors
If the antenna is positioned away from the user's body, then FCC safety limits for RF exposure are met, but signal transmission distance and coverage may be reduced
Solution Approach 1:
The patent utilizes the lateral edge dimension of the device to position the antenna away from the user's body during typical handheld operation, where the side edges are naturally oriented away from the user's head and torso. This dimensional positioning simultaneously achieves FCC compliance by increasing distance from the body while maintaining signal transmission effectiveness through optimal edge placement
Solution Approach 2:
The patent proactively positions the antenna on the lateral edges during device design and manufacturing, anticipating both FCC safety requirements and signal transmission needs. This preliminary positioning ensures that the antenna is pre-configured in locations that inherently satisfy both compliance and performance requirements before actual use
3Object-affected harmful factors
If a dielectric covering is added to protect the antenna, then RF exposure safety is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent extracts and eliminates the dielectric covering component from the antenna structure by positioning the antenna on the lateral edges where physical contact with the user's body is minimized. This removal of the dielectric layer simplifies the device structure, reduces manufacturing complexity, and lowers production costs while still achieving RF exposure safety through geometric positioning
Solution Approach 2:
The patent allows the antenna structure to serve its own protective function by utilizing the device housing's lateral edge geometry and the natural operating posture of the user. The housing structure itself and the positioning strategy provide the necessary protection and safety without requiring additional dielectric covering materials or components
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 effectively reduces signal attenuation and ensures compliance with FCC safety limits by positioning the RF-emitting components away from the user's body, maintaining signal integrity and safety during device operation.
Implementation Method 1
The slot radiates electromagnetic (EM) waves when a driving frequency, e.g., RF, is applied to the plate
Implementation Method 2
hand contact with a handheld wireless communication device can disrupt or attenuate electromagnetic signal transmission and reception due to human tissue acting as an electrical conductor
Data Source
AI summary
A method for a wireless communication device including configuring an antenna including antenna circuitry to receive or transmit wireless signals; feeding a radio frequency signal into the antenna circuitry; providing a housing comprising a plurality of edges, wherein the edges comprise a top edge, a bottom edge, and two side edges, wherein a first edge of the housing comprises a conductive strip, a first slot, and a second slot, and wherein the first edge is the top or bottom edge; providing an input/output port adjacent to the first edge of the housing; and locating the conductive strip, which comprises a portion of the antenna, entirely between the first slot and the second slot, wherein a length of each of the first slot and the second slot extends across the first edge of the housing and is oriented perpendicular to a major axis of the conductive strip.