Mobile communication device and impedance matching method thereof

A technology for mobile communication devices and impedance matching, which is applied to antenna supports/mounting devices, electrical components, transmission systems, etc., and can solve problems such as reducing antenna performance

Inactive Publication Date: 2014-01-29
HTC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This practice may take a long time to complete, thus indirectly reducing the effectiveness of the antenna

Method used

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  • Mobile communication device and impedance matching method thereof
  • Mobile communication device and impedance matching method thereof
  • Mobile communication device and impedance matching method thereof

Examples

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Embodiment Construction

[0020] figure 1 is a schematic diagram of a mobile communication device 100 according to an embodiment of the present invention. The mobile communication device 100 includes an antenna 110 , an adjustable matching circuit 120 , a power detection circuit 130 , a power amplifier 140 , and a controller 150 . The adjustable matching circuit 120 is coupled between the antenna 110 and the power amplifier 140 . The power detection circuit 130 is also coupled between the antenna 110 and the power amplifier 140 . The controller 150 is coupled to the adjustable matching circuit 120 and the power detection circuit 130 .

[0021] The antenna 110 can transmit or receive radio frequency signals to achieve the communication function of the mobile communication device 100 . The power amplifier 140 provides the radio frequency signal transmitted by the antenna 110 . The adjustable matching circuit 120 determines the output impedance encountered by the radio frequency signal sent from the p...

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Abstract

A mobile communication device and an impedance matching method thereof are provided. The mobile communication device includes an antenna, a power amplifier, a tunable matching circuit, a power detection circuit and a controller. The tunable matching circuit determines an output impedance encountered by a radio frequency (RF) signal transmitted by the power amplifier to the antenna when the RF signal enters the tunable matching circuit. The power detection circuit detects a forward power of the RF signal entering the antenna and a reflected power of the antenna. The controller tunes the tunable matching circuit according to a frequency range currently used by the mobile communication device, the forward power and the reflected power to steer the output impedance toward a corresponding load-pull impedance that the power amplifier has in the frequency range.

Description

technical field [0001] The present invention relates to a mobile communication device, and in particular to an impedance matching method for the mobile communication device. Background technique [0002] Impedance matching is important for any mobile communication device that uses an antenna to transmit signals. When the power amplifier (power amplifier) ​​of the mobile communication device sends the radio frequency signal to the antenna, if the impedance matching of the antenna is not good, part of the incident power will be reflected by the antenna, which substantially reduces the transmission power of the antenna. Different types of antennas have different impedances. When the environment changes, for example, when the user's hand is close to the mobile communication device, or the mobile communication device is close to objects such as a desktop, the impedance of the antenna will change, and different types of antennas have different ways of changing the impedance. The...

Claims

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Application Information

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IPC IPC(8): H04B1/18H01Q1/24
CPCH01Q1/242H04B1/04H04B1/0458H04B1/18H04B1/40
Inventor 何建廷许君维赖柊棋苏志钦陈万明
Owner HTC CORP
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