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filter

A technology of filter and microstrip line, which is applied in the field of filter, can solve the problems that the millimeter-wave frequency band can no longer be satisfied, the stop-band suppression effect is reduced, and the pass-band loss is improved, so as to achieve the effect of high-pass band suppression effect

Active Publication Date: 2022-07-12
IND TECH RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in applications with higher frequencies, SAW filters and BAW filters will cause problems such as increased passband loss and decreased stop band suppression effect.
According to the data, the currently used surface acoustic wave filter and bulk acoustic wave filter can no longer meet the needs of high-frequency communication technology in the millimeter wave band (Millimeter Wave, mmWave).

Method used

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Embodiment Construction

[0047] The detailed features and advantages of the present invention are described in detail in the following embodiments, and the content is sufficient to enable any person familiar with the relevant art to understand the technical content of the present invention and implement it accordingly, and according to the contents disclosed in this specification, claims and drawings , any person familiar with the relevant art can easily understand the related objects and advantages of the present invention. The following examples are intended to further illustrate the point of the present invention in detail, but do not limit the scope of the present invention in any point of view.

[0048] In addition, the embodiments of the present invention will be disclosed with the accompanying drawings below. For the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details are not intended to ...

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Abstract

The invention discloses a filter comprising a dielectric substrate, a ground layer, a circuit layer, a signal path and a ground path. The dielectric substrate is interposed between the ground layer and the circuit layer. The circuit layer includes at least three microstrip line resonance elements, a common electrode, an input terminal and an output terminal. The input terminal and the output terminal are respectively connected to the microstrip line resonance element. The microstrip line resonant element extends outward from the common electrode. Signal endpoints of the ground layer are respectively connected to the input endpoint and the output endpoint via signal paths. The ground plane of the ground plane is connected to the common electrode via a ground via. The filter also includes a capacitive coupling unit, which is electrically coupled between two adjacent ones of the microstrip line resonance elements.

Description

technical field [0001] The present invention relates to a filter, in particular to a filter using microstrip technology. Background technique [0002] As the functions of mobile terminals such as smart phones become more and more powerful, more and more network frequency bands need to be applied. Radio Frequency Front End Module (RFFEM), as the core device of the communication system, its performance It directly determines important performance indicators such as the communication mode, received signal strength, call stability, and transmit power that the mobile terminal can support. [0003] Typically, high-end smartphones have to filter the transmit / receive paths for up to dozens of frequency bands, as well as the receive paths for Wi-Fi, Bluetooth, etc. In addition to the need to isolate the signals of each receive path, it is also necessary to suppress other external signals from a variety of sources that are difficult to list. For this purpose, multi-band handsets usu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203
CPCH01P1/2039Y02D30/70
Inventor 余俊璋
Owner IND TECH RES INST