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High-isolation and glue-entering-prevention SAW duplexer

A high isolation, duplexer technology, applied in impedance networks, electrical components, multi-terminal pair networks, etc., can solve the problems of damage to the performance of the resonator arm, unfavorable miniaturization of the duplexer, affecting the integration of mobile phone transceiver modules, etc. Achieve the effect of improving isolation and high isolation performance

Active Publication Date: 2021-06-18
CHENGDU PINNACLE MICROWAVE CO LTD
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  • Application Information

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Problems solved by technology

[0002] Existing duplexers are usually difficult to meet the demand for high isolation of duplexers in the current market, especially for the technical level that the isolation requirement is less than -60dB, using a compensation circuit to construct an equal-amplitude and anti-phase branch It is not conducive to the further miniaturization of duplexers, thus affecting the integration of mobile phone transceiver modules
In addition, according to the filtering performance and power angle of the existing duplexer, the layout of the transmit filter is often close to the edge of the package, and the performance damage of the resonant arm caused by glue injection also needs to be solved from the design point of view of the SAW duplexer question

Method used

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Embodiment Construction

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them.

[0027] refer to figure 1 with Figure 4 As shown, a high-isolation SAW duplexer provided in this embodiment includes a substrate and a duplexer chip disposed on the substrate, and the duplexer chip includes a piezoelectric substrate and is constructed on the piezoelectric substrate. The transmit filter (Tx Filter) and receive filter (Rx Filter) on the bottom surface, the transmit filter is connected between the antenna terminal 1 and the transmit terminal 2, and the receive filter is connected between the antenna terminal 1 and the receive terminal 3, which can understand that, Figure 4 Among them, Ant is the connection point between the duplexer chi...

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Abstract

The invention provides a high-isolation and anti-glue-entering SAW duplexer and the duplexer is provided with a transmitting filter and a receiving filter; the isolation of the duplexer is improved by adjusting the position of a parallel resonance arm of the receiving filter and optimizing the distance between a grounding metal wire of a DMS filter in the receiving filter and other grounding metal wires and signal metal wires; furthermore, a grounding metal wire is formed on the outer side to surround the series resonance arm and the parallel resonance arm, so that the blank position between the resonance arms and the packaging edge is filled, and the phenomenon that the performance of a filter device is affected due to glue entering when the duplexer is packaged is ingeniously avoided on the basis of not increasing the cost.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to a SAW duplexer with high isolation and anti-glue entry. Background technique [0002] Existing duplexers are usually difficult to meet the demand for high isolation of duplexers in the current market, especially for the technical level where the isolation requirement is less than -60dB, using a compensation circuit to construct an equal-amplitude and anti-phase branch It is not conducive to the further miniaturization process of the duplexer, thereby affecting the integration degree of the mobile phone transceiver module. In addition, according to the filtering performance and power angle of the existing duplexer, the layout of the transmit filter is often close to the edge of the package, and the performance damage of the resonant arm caused by glue injection also needs to be solved from the design point of view of the SAW duplexer question. Contents of the inven...

Claims

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Application Information

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IPC IPC(8): H03H7/46
CPCH03H7/463
Inventor 薛浩董元旦马增红
Owner CHENGDU PINNACLE MICROWAVE CO LTD
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