Frequency division duplex device and mobile terminal

A mobile terminal and duplexer technology, applied in the field of communication, can solve problems such as increased heat generation, cost increase, and increased power consumption of mobile terminals, and achieve the effect of reducing insertion loss and heat generation

Active Publication Date: 2012-04-18
HUIZHOU TCL MOBILE COMM CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) In order to ensure that the transmission channel outputs sufficient power, the amplifier in the previous stage of the duplexer must increase the output power, which leads to an increase in the power consumption of the mobile terminal and increases the load on the battery of the mobile terminal
[0007] (2) An increase in the output power of the amplif

Method used

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  • Frequency division duplex device and mobile terminal
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  • Frequency division duplex device and mobile terminal

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] The duplexer is an essential device in the mobile terminal. By dividing two different frequency intervals, the duplexer makes the receiving path and the transmitting path work in different frequency intervals, and can easily distinguish the received information from the sent information. . But today's duplexers are usually implemented with band-stop filters. Limited by the operating frequency of the mobile terminal, the transition band of the band-stop filter can only be 20 MHz, and an isolation of up to 41 dB must be provided, resulting in a very large insertion loss of the duplexer.

[0027] In order to solve the above problems, the present invention provides a frequency division duplexer, including a receiving path and a transmitting path. In addition, a low-pass filter or a band-limit filter with low insertion loss is used in the transmis...

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Abstract

The invention discloses a frequency division duplex device which comprises a receiving access and a transmitting access, wherein a low pass filter or a band-limiting filter is adopted as the transmitting access. In addition, the invention also provides a mobile terminal which comprises a wireless transceiver, a transmission surface acoustic wave (SAW) filter, a power amplifier, the frequency division duplex device and an antenna, wherein the wireless transceiver is used for receiving or sending signals, one end of the wireless transceiver is connected with an input end of the transmission SAW filter, and the other end of the wireless transceiver is connected with a receiving end of the frequency division duplex device; the transmission SAW filter is used for selecting the transmit frequency, and an output end of the transmission SAW filter is connected with an input end of the power amplifier; an output end of the power amplifier is connected with a transmitting end of the frequency division duplex device; the frequency division duplex device comprises the receiving access and the transmitting access; the low pass filter or the band-limiting filter is adopted as the transmitting access; and an external connecting end of the transmitting access is connected with the antenna. By adopting the way, the insertion loss of the duplex device can be effectively reduced, and the heat productivity of the mobile terminal can be effectively reduced.

Description

technical field [0001] The invention relates to the communication field, in particular to a frequency division duplexer and a mobile terminal. Background technique [0002] Today's mobile terminals usually adopt the mode of simultaneous operation of the transmitting and receiving channels. In order to realize this working mode, a duplexer is an essential device. It usually consists of two or more band-pass filters of different frequencies to isolate the received signal from the transmitted signal and prevent the transmitted signal from the mobile terminal from being transmitted to the receiver. However, the insertion loss of duplexers at the current state of the art is very high due to: [0003] (1) If the transmitting frequency of the mobile terminal is between 1850MHz-1910MHz and the receiving frequency is between 1930MHz-1990MHz, therefore, the parameters of the band-pass filter need to be center frequency 1950MHz and transition band 20MHz. Such a band-stop filter is no...

Claims

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Application Information

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IPC IPC(8): H04L5/14H04B1/40H03H9/64
CPCH04W88/02H04B1/525H04B1/38
Inventor 白剑
Owner HUIZHOU TCL MOBILE COMM CO LTD
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