High-isolation surface acoustic wave duplexer and method for realizing high isolation

A high-isolation, surface-acoustic wave technology, applied in electrical components, impedance networks, etc., can solve the problems of complex functions of RF front-end modules, insufficient passband isolation and attenuation, and small size

Active Publication Date: 2020-10-23
CHENGDU PINNACLE MICROWAVE CO LTD
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  • Abstract
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Problems solved by technology

With the development of 5G, the function of the RF front-end module in the smartphone is more complex and the volume is smaller. Therefore, the duplexer in the RF module urgently needs to be miniaturized. The existing duplexer design

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  • High-isolation surface acoustic wave duplexer and method for realizing high isolation
  • High-isolation surface acoustic wave duplexer and method for realizing high isolation
  • High-isolation surface acoustic wave duplexer and method for realizing high isolation

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the invention are not limited to the specific examples provided.

[0024] refer to figure 1 As shown, a high-isolation SAW duplexer according to an embodiment of the present invention, the duplexer has an antenna terminal (ANT) 1, a transmitting terminal (TX) 2 and a receiving terminal (RX) 3, and the antenna terminal A transmit filter (TX Filter) is connected between 1 and transmit terminal 2, and a receive filter (RX Filter) is connected between antenna terminal 1 and receive terminal 3; the receive filter consists of a ladder filter unit and a longitudinal coupling resonator The ladder filter unit includes series resonant arms S5 and S6, and parallel resonant arms P4 and P5. One end of the series resonant arm S5 is connected to the antenna terminal 1, and the other end is respectively connected to ...

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Abstract

The invention discloses a high-isolation surface acoustic wave duplexer and a method for realizing high isolation. The duplexer is provided with an antenna terminal, a transmission terminal and a receiving terminal. A transmission filter is connected between the antenna terminal and the transmission terminal, a receiving filter is connected between the antenna terminal and the receiving terminal,a suppression resonator is connected in series with the port of the receiving filter, the isolation and suppression of the passband of the duplexer are improved by optimizing the grounding mode of thelongitudinal coupling filter, and meanwhile, the miniaturization design of the duplexer is facilitated.

Description

technical field [0001] The invention relates to a duplexer for mobile communication terminals, in particular to a high-isolation surface acoustic wave duplexer and a method for realizing high isolation. Background technique [0002] In the existing duplexer, a coupling capacitor (CG) is usually connected between the transmitting filter and the receiving end filter to enhance the isolation of the duplexer. The receiving filter (RX) is a ladder filter composed of a single-port surface acoustic wave (SAW) resonator. The ladder filter itself has the problem of large area occupancy. At the same time, the introduction of the coupling capacitor CG further increases the area of ​​the duplexer chip. . With the development of 5G, the function of the RF front-end module in the smartphone is more complex and the volume is smaller. Therefore, the duplexer in the RF module urgently needs to be miniaturized. The existing duplexer design is not conducive to meeting the requirements of curr...

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Application Information

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IPC IPC(8): H03H9/72
CPCH03H9/725
Inventor 雷强董元旦杨涛张元
Owner CHENGDU PINNACLE MICROWAVE CO LTD
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