Adaptive Antenna Reactance Control for Interference Suppression
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Solution Overview
Problem
Existing adaptive antenna apparatuses for mobile communication systems face challenges in size constraints and complexity due to the need for optimal arrangement of antenna elements and the use of multiple ESPER antennas, which limits their applicability in portable devices and increases interference suppression complexity.
Innovation Solution
An adaptive antenna apparatus with a reduced number of elements that dynamically selects between two adaptive control processes based on detected signal quality, using a combination of antenna elements, variable reactance elements, and a controller to optimize signal reception and interference suppression, even in low-frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple ESPER antennas and parasitic elements are used for adaptive control, then interference suppression capability is improved, but device size and structural complexity increase
Solution Approach 1:
The patent applies dynamics by making the antenna system adaptable through variable reactance elements that can be dynamically adjusted based on detected signal quality. The system switches between different adaptive control processes (first and second processes) depending on whether signal quality meets a threshold, enabling the antenna structure to dynamically optimize its interference suppression capability without requiring a fixed complex multi-antenna configuration.
Solution Approach 2:
The patent changes parameters by adjusting reactance values of variable reactance elements connected to parasitic elements. By modifying these reactance parameters based on signal quality detection, the system achieves adaptive interference suppression. This parameter-based control allows a simpler antenna structure to achieve the performance of more complex multi-antenna systems.
2Reliability
If antenna elements are arranged at optimal intervals for adaptive control, then signal reception quality is improved, but the apparatus size increases beyond portable device constraints
Solution Approach 1:
The patent applies local quality by optimizing specific local arrangements of antenna elements and parasitic elements rather than requiring optimal global arrangement of multiple ESPER antennas. By focusing on local quality enhancement through variable reactance elements at strategic positions, the system achieves good signal reception quality within a compact form factor suitable for portable devices.
Solution Approach 2:
The patent uses variable reactance elements as intermediaries between the antenna elements/parasitic elements and the signal processing system. These intermediary elements enable the antenna structure to achieve optimal performance without requiring the elements themselves to be arranged at ideal intervals, thus allowing compact sizing while maintaining signal reception quality.
3Reliability
If adaptive control process is continuously adjusted based on signal quality, then communication reliability is improved, but processing complexity and power consumption increase
Solution Approach 1:
The patent implements periodic action by using threshold-based decision making rather than continuous adjustment. The signal quality detector periodically evaluates whether signal quality meets a predetermined threshold, and the apparatus controller switches between first and second adaptive control processes based on this periodic evaluation. This threshold-based periodic control reduces processing complexity compared to continuous adjustment while maintaining communication reliability.
Solution Approach 2:
The patent segments the adaptive control into two distinct processes (first adaptive control process and second adaptive control process) that are selected based on signal quality thresholds. This segmentation allows the system to use simpler control logic (threshold comparison) rather than complex continuous optimization, reducing processing complexity while maintaining reliability through appropriate process selection.
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 enables effective suppression of interference waves with a smaller number of antenna elements, ensuring the best possible signal quality is maintained across various frequency bands, particularly in mobile radio systems, by adaptively controlling reactance values and selecting optimal antenna configurations.
Implementation Method 1
a reactance controller that executes a second adaptive control process for reactance controlling an element value of the variable reactance element connected to the parasitic element
Implementation Method 2
A weighting controller that weights the received signals received by the plurality of antenna elements by means of respective weighting circuits, combines the weighted received signals by means of a combining circuit
Implementation Method 3
A plurality of radiating antenna elements arranged so that spatial correlations therebetween become smaller, that is, at an interval 'd' of d>>λ, where λ denotes a wavelength of a radio signal
Data Source
AI summary
An adaptive antenna apparatus includes two antenna elements and a parasitic element to which a variable reactance element is connected, and selects an adaptive control process according to detected signal quality. A controller executes a first adaptive control process for adaptively controlling respective signals received by the respective antenna elements and outputting the respective signals after the adaptive control as a combined received signal, and executes a second adaptive control process for reactance controlling an element value of the variable reactance element. The controller executes the first adaptive control process. The controller executes a communication process when the detected signal quality is equal to or larger than a predetermined threshold. The controller executes the second adaptive control process when the detected signal quality is not equal to or larger than the threshold.