Mobile Terminal Antenna Coupling Structure for SAR Sensing

Solution Overview

Problem

Existing antennas for mobile terminals face challenges in balancing Specific Absorption Rate (SAR) and antenna performance, particularly due to the need for capacitive sensors that increase costs and affect antenna performance.

Innovation Solution

The proposed antenna design for mobile terminals incorporates a coupling unit with an intersection structure, such as a helical structure, that allows for non-electrical internal connections, eliminating the need for a capacitor between the second radiation unit and the grounding point, thereby saving costs and maintaining antenna performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a capacitor is connected between the grounded part of the antenna and the grounding point to enable capacitive sensing function, then the antenna can sense distance for SAR control, but the antenna performance is affected and costs increase

Engineering Contradiction:

Improvecapacitive sensing functionVSAvoidantenna performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent merges the capacitive sensing function and antenna radiation function into a single integrated structure. The radiation unit itself serves as the capacitive sensor by utilizing its inherent capacitance characteristics, eliminating the need for a separate capacitor component. This integration maintains antenna performance while enabling distance sensing for SAR control.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The radiation unit is designed to perform multiple functions simultaneously: it acts as both the antenna for signal transmission and reception, and as a capacitive sensor for distance detection. This multi-functionality reduces component count and avoids the performance degradation associated with adding external capacitors.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If a capacitor is connected between the grounded part of the antenna and the grounding point to enable capacitive sensing function, then the antenna can sense distance for SAR control, but manufacturing costs increase

Engineering Contradiction:

Improvecapacitive sensing functionVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent merges the capacitive sensing function and antenna radiation function into a single integrated structure. The radiation unit itself serves as the capacitive sensor by utilizing its inherent capacitance characteristics, eliminating the need for a separate capacitor component. This integration maintains antenna performance while enabling distance sensing for SAR control.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent extracts and eliminates the separate capacitor component from the traditional design. By recognizing that the radiation unit's inherent capacitance suffices for sensing purposes, the design removes the need for additional capacitor components, thereby reducing bill of materials costs and simplifying manufacturing.

Inventive Principle:

Principle #2Taking out (Extraction)

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 design effectively reduces the impact of capacitors on antenna performance, saves costs, and allows the antenna to function as a capacitive sensor without compromising SAR or antenna performance.

Implementation Method 1

Another terminal of the first radiation unit is non-electrically connected to a terminal of the second radiation unit through the coupling unit

Methodology Applied

Scientific EffectElectromagnetic coupling: Electromagnetic Induction

Implementation Method 2

an antenna effectively converts a high-frequency current in a circuit or a guided wave on a feed transmission line to a polarized spatial electromagnetic wave, and then emits the spatial electromagnetic wave in a predetermined direction

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Implementation Method 3

a grounded part of the antenna is connected to a capacitor and then is grounded, resulting in the capacitor affecting the performance of the antenna

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS20250030150A1Antenna for mobile terminal, and mobile terminal

Publication Date: 2025.01.23 KUNSHAN INNOWAVE COMMUNICATION TECHNOLOGY CO LTD

AI summary

An antenna for a mobile terminal and a mobile terminal are provided. The antenna for a mobile terminal includes: a first radiation unit, a second radiation unit, a coupling unit and a chip unit that are arranged on a mainboard. A terminal of the first radiation unit is provided with a feeding point. The feeding point is connected to the chip unit. Another terminal of the first radiation unit is non-electrically connected to a terminal of the second radiation unit through the coupling unit, and another terminal of the second radiation unit is grounded.