Antenna Element With Isolation Circuit For Proximity Sensing
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Solution Overview
Problem
Existing mobile communication devices face reduced communication quality due to the placement of a large sensing electrode next to the antenna element, which affects the radiation characteristics and increases electromagnetic wave absorption by the human body.
Innovation Solution
Integration of an isolation circuit and blocking elements with the antenna element to combine capacitive sensing and antenna functions without interfering with each other, allowing the antenna to function as both a sensing and radiation element while preventing electromagnetic wave absorption by the human body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a larger area of sensing electrode is placed next to the antenna element, then the sensing capability is improved, but the radiation characteristic of the antenna element is influenced and communication quality is reduced
Solution Approach 1:
The patent combines the antenna element and sensing electrode into a single integrated structure. The antenna element itself serves dual purposes: as a radiation element for wireless communication and as a sensing electrode for proximity detection. This merging eliminates the need for a separate sensing electrode, thereby avoiding the negative impact on radiation characteristics while maintaining sensing capability.
Solution Approach 2:
The antenna element is designed to perform multiple functions simultaneously. It radiates electromagnetic waves for communication while also functioning as a capacitive sensing electrode for proximity detection. This multi-functionality allows the device to achieve both communication and sensing goals without adding separate components that would interfere with radiation characteristics.
2Measurement precision
If a sensing electrode is placed next to the antenna element, then proximity sensing is enabled, but electromagnetic wave absorption by the human body increases
Solution Approach 1:
The sensing function is merged with the antenna element itself rather than using a separate sensing electrode. This integration ensures that the sensing electrode and radiation element are the same component, eliminating the issue of additional electromagnetic wave absorption from a separate sensing electrode while maintaining proximity sensing capability.
Solution Approach 2:
The antenna element serves itself by performing both radiation and sensing functions. The same structural element that radiates electromagnetic waves also detects proximity through capacitive sensing, eliminating the need for additional components that would increase electromagnetic wave absorption.
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 the antenna element to maintain communication quality while reducing electromagnetic wave absorption by humans, allowing for effective proximity sensing and power adjustment to prevent health risks without compromising wireless transmission.
Implementation Method 1
the antenna element is provided with a capacitive sensing function... a capacitance of the antenna element changes when an object is near to thereby generate a sensing signal
Implementation Method 2
The low-frequency blocking element is electrically connected to the radiation portion, and configured to block the sensing signal from flowing into a feeding point of the radiation portion. In addition, the low-frequency blocking element does not block the radio-frequency signal
Implementation Method 3
The first isolation circuit and a connection element are connected in series between the radiation portion and the parasitic portion, and the first isolation circuit is configured to block the radio-frequency signal and allow the sensing the sensing signal to pass through. The second isolation circuit is electrically connected between the parasitic portion and a ground plane, and the second isolation circuit is configured to block the sensing signal from passing through and transmit the radio-frequency signal
Data Source
AI summary
A mobile communication device includes an antenna element, a low-frequency blocking element, an isolation circuit, a first high-frequency blocking element and a second high-frequency blocking element. The antenna element converts a radio-frequency signal into an electromagnetic wave and includes a radiation portion and a parasitic portion. The parasitic portion and the radiation portion generate a first sensing signal and a second sensing signal in response to a proximity of an object. The low-frequency blocking element transmits the radio-frequency signal to the radiation portion. The isolation circuit is connected between the parasitic portion and a ground plane, and the isolation circuit blocks the first sensing signal and transmits the radio-frequency signal. The first high-frequency blocking element transmits the first sensing signal to a first sensing controller through a first metal line. The second high-frequency blocking element transmits the second sensing signal to a second sensing controller through a second metal line.