Co-located Active Steering Antennas for Body Loading Detuning
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Solution Overview
Problem
Conventional active antenna systems face detuning issues due to body loading effects, such as hand and head loading, which affect performance and require improved technologies to support LTE-advanced carrier aggregation requirements.
Innovation Solution
The implementation of co-located active steering antennas positioned near the bottom of a wireless communication device, capable of independent operation, multi-input multi-output configuration, active band switching, active impedance matching, and unit selectivity, which allows for optimal antenna selection based on hand and head loading characteristics to minimize losses and maintain performance across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional passive antennas are used, then device simplicity is maintained, but body loading effects cause detuning and performance degradation
Solution Approach 1:
The patent implements dynamic reconfiguration of antenna elements using active components (tunable capacitors, phase shifters, switches) that can adjust antenna characteristics in real-time based on detected body loading conditions, transforming the static antenna system into a dynamically adaptable one that compensates for detuning effects
Solution Approach 2:
The patent changes physical parameters of the antenna system by varying capacitance values, phase shifts, and impedance matching parameters through active components to compensate for body loading effects and maintain optimal performance across different usage scenarios
2Reliability
If active antenna components are added for body loading compensation, then performance stability improves, but device complexity increases
Solution Approach 1:
The patent designs antenna elements that serve multiple functions simultaneously - radiation, impedance matching, and body loading compensation - by integrating active components directly into the antenna structure, allowing a single system to handle multiple tasks that would otherwise require separate subsystems
Solution Approach 2:
The patent merges the antenna radiating elements with active compensation components (tunable capacitors, phase shifters) into an integrated structure, combining the functions of signal radiation and body loading mitigation into a unified system rather than separate components
3Reliability
If single antenna is used, then device simplicity is maintained, but hand/head loading causes signal loss
Solution Approach 1:
The patent divides the antenna system into multiple co-located active steering antennas, each capable of independent operation, allowing the system to segment the signal transmission paths and select or combine antennas based on which experiences less body loading at any given moment
Solution Approach 2:
The patent implements feedback mechanisms that monitor signal quality and body loading conditions on each antenna element, using this information to dynamically adjust phase and amplitude of signals from individual antennas to maximize overall system performance and minimize losses
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 solution effectively mitigates detuning effects, enhances communication performance by independently tuning low frequency bands while preserving high bands, and supports LTE-advanced carrier aggregation by maximizing power transfer and reducing hand and head losses, thereby improving overall connectivity and communication system performance.
Implementation Method 1
The co-located active steering antennas are each configured to steer a radiation pattern of the respective antenna
Implementation Method 2
The co-located active steering antennas can be further configured for active band switching
Implementation Method 3
The co-located active steering antennas can be further configured for active impedance matching
Data Source
AI summary
An antenna system includes collocated active steering antennas implemented in a bottom portion of a wireless communication device designed for positioning near a user's mouth or chin. The co-located active steering antennas are each configured to steer a radiation pattern of the respective antenna, and can be further configured for active band switching and/or active impedance matching. These co-located active steering antennas can be used independently, or in a multi-input multi-output (MIMO) configuration. In addition, the antenna system is capable of antenna unit selectivity, which includes the ability to select one of the co-located antennas with the lowest head and hand loss for use, while disabling the antenna with the highest loss attributed to hand head loading.