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Surface acoustic wave (SAW) filter and manufacturing method thereof

A surface acoustic filter, inner surface technology

Inactive Publication Date: 2013-08-28
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Since the impedance of the existing surface acoustic filter is much greater than 50 ohms, and the base station equipment of various standards in its practical application requires the transmission line impedance to be 50 ohms, therefore, in order to achieve impedance matching, the existing surface acoustic filter When welding the surface acoustic filter on the PCB, it is also necessary to connect a matching circuit composed of multiple inductors and capacitors outside the surface acoustic filter, thus making the PCB volume of the existing surface acoustic filter large and integrated low level

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  • Surface acoustic wave (SAW) filter and manufacturing method thereof
  • Surface acoustic wave (SAW) filter and manufacturing method thereof
  • Surface acoustic wave (SAW) filter and manufacturing method thereof

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Embodiment Construction

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0021] figure 1 It is a cross-sectional view of the surface acoustic filter according to Embodiment 1 of the present invention. Such as figure 1 As shown, the surface acoustic filter at least includes: a ceramic base 11 , a filter chip 12 and an additional device 13 . Wherein, the ceramic base 11 includes a ceramic top surface 111 and a ceramic...

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Abstract

The invention provides a surface acoustic wave (SAW) filter and a manufacturing method thereof. The SAW filter comprises a ceramic base, a filter chip and an additional device, wherein, the ceramic base comprises a ceramic top surface and a ceramic side elevation; the surface, which is provided with a metal film, of the filter chip is welded on the internal surface of the ceramic top surface; andthe additional device is mounted on the external surface of the ceramic top surface. The invention further provides a manufacturing method of the SAW filter. By adopting the SAW filter and the manufacturing method thereof, the required additional device for the SAW filter is jointed on the external surface of the ceramic top surface of the ceramic base so as to realize impedance matching of the SAW filter, thus the additional device is not additionally arranged outside the SAW filter in a circuit, and the integration degree of the SAW filter is improved.

Description

technical field [0001] Embodiments of the present invention relate to filtering technologies, and in particular to a surface acoustic filter and a manufacturing method thereof. Background technique [0002] At present, among the commonly used base station equipment of various standards, for example, in Global System for Mobile Communications (Global System for Mobile Communications, referred to as GSM), Code Division Multiple Access (Code Division Multiple Access, referred to as CDMA), Wideband Code Division Multiple Access Wideband Code Division Multiple Access (WCDMA for short), Time Division-Synchronous Code Division Multiple Access (TD-SCDMA for short), Worldwide Interoperability for Microwave Access (Wimax for short), and long-term In the base station equipment of standards such as Long Term Evolution (LTE for short), an intermediate frequency filter with a small bandwidth and a good rectangular coefficient is required. Because the surface acoustic filter has the chara...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/64
Inventor 庞照勇肖培义
Owner HUAWEI TECH CO LTD