Antenna device, mobile terminal and antenna adjustment method

Abstract

The embodiment of the invention relates to the technical field of an antenna and discloses an antenna device, a mobile terminal and an antenna adjustment method. The antenna device provided by the embodiment of the invention comprises an SAR sensor and at least one antenna. Input ends of the SAR sensor are connected with connection parts of the antennas. An output end of the SAR sensor is connected with a processor. The number of the input ends of the SAR sensor is equal to that of the antennas. The SAR sensors are used for sensing the distance between the antennas and a body and outputting the distance to the processor. The processor is used for adjusting transmitting powers of to-be-adjusted antennas corresponding to the antennas when the distance is within preset distance. The embodiment of the invention also provides the mobile terminal and the antenna adjustment method. According to the embodiment of the invention, the terminal is enabled to satisfy a specific absorption rate teststandard, the radiation performance of the antenna is prevented from being avoided, the SAR reduction demands of a plurality of antennas can be satisfied through adoption of one sensor, the cost andspace are reduced, the structure complexity is reduced, and the scheme flexibility is improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of antennas, and in particular to an antenna device, a mobile terminal, and an antenna adjustment method. Background technique [0002] Mobile terminals such as mobile phones and tablet computers are widely used in people's daily life, and the terminals are usually relatively close to the human body. In order to keep the influence of the electromagnetic waves radiated by the antenna in the terminal on the human body within a safe range, CE certification and FCC certification are required for SAR (Electromagnetic wave specific absorption rate) requirements are also more stringent, therefore, the antenna in the terminal must meet the SAR index requirements. [0003] In the existing terminal, the antenna SAR reduction scheme: such as Figure 1A As shown, the antenna in the terminal includes a first branch 1" with a first ground feeder 11" and a second branch 2" with a second ground feeder ...

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Problems solved by technology

[0004] However, the inventors found the following problems in the prior art: Generally speaking, the possibility of the SAR value of the main antenna in the terminal exceeding the standard is high. Therefore, the existing terminal usually uses the main antenna as a radiator and an inductor to realize the main antenna itself. The purpose of reducing SAR

But doing so will lead to the following problems: (1) The main antenna covers more frequency bands as a radiator, and when it is used as an inductor, capacitive elements (such as the first capacitor 41" are added to each antenna branch to isolate the ground current function), the antenna pattern of the main antenna is very limited, which affects the antenna efficiency of the main antenna; (2) Since the capacitive sensor 5" can only input one signal, if there are other antennas on the device besides the main antenna If the SAR value exceeds the standard, it is necessary to add a capacitive sensor 5" to the antenna whose SAR value exceeds the standard to achieve the purpose of reducing the SAR of the antenna itself. That is, if the existing terminal needs to reduce the SAR of several antennas, it needs the same number of capacitors Type sensor 5", resulting in increased equipment costs, large space occupation and inflexible solutions, complex structure and difficult to implement

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