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An acoustic surface wave duplexer

A surface acoustic wave and duplexer technology, applied in the transmission system, electrical components, impedance network, etc., can solve the problems of unable to transmit, increase insertion loss, poor stop band suppression, etc., achieve high transceiver isolation, volume reduction The effect of small and low insertion loss

Inactive Publication Date: 2006-01-18
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the longitudinally coupled resonant SAW filter 13, the stopband rejection is poor, and the stopband rejection can be improved by cascading multi-stage filters, but the insertion loss increases accordingly, so it cannot be used as a transmitter

Method used

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  • An acoustic surface wave duplexer
  • An acoustic surface wave duplexer
  • An acoustic surface wave duplexer

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Embodiment Construction

[0024] Taking the mobile phone as an example now, the operating principle of the present invention is described in detail as follows in conjunction with the accompanying drawings and embodiments:

[0025] Make a surface acoustic wave filter, refer to figure 1 and Figure 5 , in this embodiment, the piezoelectric substrates 7, 23 and 24 of the duplexer adopt a rectangular 42°YX-LiTaO 3 Piezoelectric substrates, the upper surfaces of the piezoelectric substrates 7, 23 and 24 are respectively plated with metal aluminum, and then photoetched out such as Figure 5 The transmitter surface acoustic wave filter 4, the transmitter second surface acoustic wave filter 4' and the receiver surface acoustic wave filter 5 are shown, and the input terminal of the receiver surface acoustic wave filter 5 is connected in series with the phase shifter 6 The surface acoustic wave filter 4 of the transmitting end is connected in parallel with the electrode 1, the output terminal of the surface a...

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Abstract

This invention relates to a sonic surface wave duplexer used for cluster communication system hand-held terminal, comprising a transmitting end first sonic surface wave filter and a receiving end sonic surface wave filter, a transmitting end second sonic surface wave filter located in the front of power amplifier, wherein, the outlet of transmitting end second sonic surface wave filter attaches to the inlet of transmitting circuit power amplifier, then to transmitting end first sonic surface wave filter inlet, the other end via electrode attaches to the front section of transmitting circuit power amplifier, the said transmitting end second sonic surface wave filter is composed of sonic surface wave filter in form of ladder and sonic surface wave band-reject filter, which is formed through making the resonator and external inductance attach in the shape of II. The invention has the advantages of high receive-and-transmit isolation, low insertion loss, small volume and so on.

Description

technical field [0001] The invention relates to a surface acoustic wave duplexer, in particular to a surface acoustic wave duplexer used for a handheld terminal of a trunking communication system. Background technique [0002] Duplexers are commonly used in frequency division duplex wireless communication systems. It is a three-terminal network, one port is connected to the antenna, one port is connected to the transmitting circuit, and the other port is connected to the receiving circuit; the function of the duplexer is to ensure that the signal from the transmitting circuit is radiated out through the antenna instead of flowing into the receiving circuit; the antenna receives The received signal is sent to the receiving circuit after passing through the duplexer, and does not flow into the transmitting circuit. Therefore, the basic requirements of the duplexer are: low insertion loss, high transceiver isolation. [0003] In the prior art, there is a cavity-type duplexer,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/145H03H9/25H03H9/64H04B1/52
Inventor 何世堂刘久玲梁勇
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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