Common Matching Circuit for Inductive and Capacitive Antennas

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Solution Overview

Problem

Existing communication systems that combine electrostatic, capacitive, and inductive coupling technologies face performance issues due to the challenges of matching impedances and ensuring reliable communication between different antenna elements.

Innovation Solution

An electric circuit with a common matching circuit for both inductive and capacitive antenna elements, allowing for simultaneous or sequential operation without cross-talk, enabling a single device to use both inductive and capacitive communication paths, such as in Near Field Communication and Active Digital Aura, with a shared RF front end.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single device combines both inductive and capacitive antenna elements with separate RF front ends, then communication versatility and reliability are improved, but device complexity and size increase

Engineering Contradiction:

Improvecommunication versatilityVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies universality by designing a single RF front end that can handle both inductive and capacitive antenna elements. The matching circuit is configured to accommodate impedance variations from different antenna types, allowing one circuit to perform multiple functions rather than requiring separate dedicated circuits for each antenna type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the RF front end functionality into a single shared circuit that serves both inductive and capacitive antenna elements. This consolidation integrates what would traditionally be separate processing paths into one unified structure, reducing overall system complexity while maintaining support for both communication modes.

Inventive Principle:

Principle #5Merging (Combining)

2Device complexity

If a common matching circuit is used for both inductive and capacitive antenna elements, then device complexity is reduced, but impedance matching performance and communication reliability may deteriorate

Engineering Contradiction:

Improvecircuit complexityVSAvoidcommunication reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The matching circuit employs dynamic switching mechanisms that adapt its configuration based on which antenna type is active. Switches can reconfigure the circuit topology to optimize impedance matching for either inductive or capacitive antennas, allowing the circuit to dynamically adjust rather than being fixed in a single configuration.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies local quality by providing different matching network configurations within the same circuit structure. Different portions of the matching circuit can be activated depending on the antenna type, with each portion optimized for its specific antenna type while sharing common infrastructure.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If inductive and capacitive antenna elements operate simultaneously, then communication flexibility is improved, but cross-talk between antenna elements increases

Engineering Contradiction:

Improvecommunication flexibilityVSAvoidcross-talk

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts and separates the signal paths for inductive and capacitive antennas using switching mechanisms. When one antenna type is active, the corresponding signal path is isolated from the other antenna type, effectively removing the source of cross-talk while maintaining the capability to switch between modes.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system employs periodic switching between inductive and capacitive antenna modes rather than continuous simultaneous operation. The switching occurs in controlled time intervals, allowing one antenna type to be active at a time and eliminating continuous cross-talk while maintaining flexibility through rapid mode switching.

Inventive Principle:

Principle #19Periodic action

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

This solution provides a high-performance, flexible, and reliable communication system with increased radio range and applicability, allowing for bi-directional communication using a single device without significant modifications to the receiving circuit, enhancing functionality and reliability compared to conventional systems.

Implementation Method 1

an inductive antenna element adapted for inductively communicating with the further communication device

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a capacitive antenna element adapted for capacitively communicating with the further communication device

Methodology Applied

Scientific EffectCapacitive coupling: Capacitance

Data Source

PatentUS7907057B2Communication device and an electric circuit for a communication device

Publication Date: 2011.03.15 NXP BV

AI summary

An electric circuit for a communication device (200) for communicating with a further communication device (500), the electric circuit comprising an inductive antenna element (101) adapted for inductively communicating with the further communication device (500), a capacitive antenna element (102) adapted for capacitively communicating with the further communication device (500), and a common matching circuit (105) adapted to match impedances of the inductive antenna element (101) and of the capacitive antenna element (102).