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Terminal, radio frequency front end device and electromagnetic wave specific absorption rate adjustment method and system thereof

An absorption ratio and radio frequency front-end technology, applied in the field of radio frequency, can solve the problems of difficult detection and control of SAR

Active Publication Date: 2018-05-04
XIAN YIPU COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that SAR sensors or other sensors that detect the proximity of the human body are usually used to track the environment around the antenna in the prior art, which makes it difficult to accurately detect and control SAR, and provide a terminal, radio frequency Front-end device and method and system for adjusting electromagnetic wave absorption ratio thereof

Method used

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  • Terminal, radio frequency front end device and electromagnetic wave specific absorption rate adjustment method and system thereof
  • Terminal, radio frequency front end device and electromagnetic wave specific absorption rate adjustment method and system thereof
  • Terminal, radio frequency front end device and electromagnetic wave specific absorption rate adjustment method and system thereof

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Embodiment 1

[0081] figure 1 The method for adjusting the electromagnetic wave absorption ratio of the radio frequency front-end device of this embodiment is shown. The radio frequency front-end device includes at least one antenna, and the electromagnetic wave absorption ratio adjustment method includes:

[0082] Step 101. Detect the impedance of the antenna in the working state among the at least one antenna.

[0083] Step 102. Determine the UI scene where the radio frequency front-end device is located according to the detected impedance.

[0084] Step 103: Acquire the maximum radio frequency transmission power of the antenna in the working state in the UI scene that meets the electromagnetic wave absorption ratio index.

[0085] Step 104, reducing the radio frequency transmission power of the antenna in the working state to below the corresponding maximum radio frequency transmission power.

[0086] Among them, the UI scene represents the usage scene of the user, for example, the us...

Embodiment 2

[0089] This embodiment is based on Embodiment 1, and further explains the method for adjusting the electromagnetic wave absorption ratio of the present invention.

[0090] In the actual use of the RF front-end device, the RF transmission power of the antenna usually fluctuates, and the SAR may not always exceed the SAR index. Therefore, in order to avoid repeated adjustments of the RF transmission power and occupying too many system resources, it is not necessary to continuously perform the steps 101-step 104, and only need to execute step 101-step 104 when the radio frequency transmission power is too large and the SAR exceeds the SAR index.

[0091] In this embodiment, the method for adjusting the electromagnetic wave absorption ratio presets a high power threshold Pht, and takes the monitored radio frequency transmission power of the antenna greater than the high power threshold Pht as an initial condition for triggering step 101 . Since the maximum radio frequency transmis...

Embodiment 3

[0103] This embodiment is based on Embodiment 2, and further explains the method for adjusting the electromagnetic wave absorption ratio of the present invention.

[0104] The radio frequency front-end device of this embodiment specifically includes an antenna, and the electromagnetic wave absorption ratio adjustment method also provides a pre-stored table, the pre-stored table includes: preset n kinds of UI scenes (n≥1), and the The impedance of the antenna when it is in the working state, and the maximum radio frequency transmission power corresponding to the UI scene one by one. Wherein, the maximum radio frequency transmission power one-to-one corresponding to the UI scenarios is an empirical value obtained by actually measuring the radio frequency transmission power of the antenna on the premise of meeting the SAR index in the UI scene.

[0105] Such as Figure 5 As shown, the method for adjusting the electromagnetic wave absorption ratio in this embodiment specifically ...

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Abstract

The invention discloses a terminal, a radio frequency front end device and an electromagnetic wave specific absorption rate adjustment method and system thereof. The radio frequency front end device comprises at least one antenna. The electromagnetic wave specific absorption rate adjustment method comprises the steps of detecting impedance of an antenna in a working state, in the at least one antenna; determining a UI scene in which the radio frequency front end device is located according to the detected impedance; acquiring the maximum radio frequency transmitting power of the antenna in theUI scene, wherein the antenna is in the working state and the maximum radio frequency transmitting power satisfies an electromagnetic wave specific absorption rate index; and reducing the radio frequency transmitting power of the antenna in the working state to the corresponding radio frequency transmitting power smaller than the maximum radio frequency transmitting power. According to the terminal, the radio frequency front end device and the electromagnetic wave specific absorption rate adjustment method and system thereof, the radio frequency transmitting power of the antenna in differentUI scenes is controlled through real-time detection of the impedance of the antenna, so an SAR (Specific Absorption Rate) adjustment demand and an SAR index are satisfied.

Description

technical field [0001] The invention belongs to the field of radio frequency technology, and in particular relates to a terminal, a radio frequency front-end device and a method and system for adjusting electromagnetic wave absorption ratio thereof. Background technique [0002] The electromagnetic wave absorption ratio is an important index to measure the radiation of wireless terminal products such as mobile phones to the human body. Electromagnetic wave absorption ratio (SAR, Specific Absorption Rate) refers to the electromagnetic power absorbed or consumed by human tissue per unit mass, in W / kg, which represents the impact of radiation on the human body. The lower the SAR value, the more radiation is absorbed. less. [0003] For SAR standards, CE certification (European Union) and FCC (Federal Communications Commission of the United States) have formulated different limit values ​​and test methods, and most other countries or regions use these two mainstream standards f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/10H04B17/20H04B1/40
CPCH04B1/40H04B17/101H04B17/20
Inventor 李伟
Owner XIAN YIPU COMM TECH
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