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Miniature multilayer ceramic band-pass filter

A band-pass filter, multilayer ceramic technology, applied in multi-terminal pair networks, impedance networks, electrical components, etc., can solve problems such as negative effects on device performance, and achieve the effect of low insertion loss, length and width reduction

Pending Publication Date: 2019-11-08
YANCHUANG PHOTOELECTRIC TECH GANZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the traditional method, the internal coupling of the device will increase with the increase of the dielectric constant. After the internal coupling increases to a certain extent, the performance of the device will be negatively affected; after the dielectric loss is reduced to a certain extent, the conductor loss and Radiation loss will become the main factor affecting device loss
Therefore, starting with materials alone cannot solve the current problem of both miniaturization and high performance of devices, and it is necessary to find corresponding solutions from the perspective of circuit design.

Method used

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  • Miniature multilayer ceramic band-pass filter
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  • Miniature multilayer ceramic band-pass filter

Examples

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Embodiment 1

[0034] combine Figure 1 to Figure 3As shown, the miniature multilayer ceramic bandpass filter of this embodiment includes a central laminated body 100 and a filter circuit 200 disposed in the central laminated body. unit, each carrying unit is composed of multi-layer dielectric substrates stacked from top to bottom, adjacent dielectric substrates are connected to each other through conduction strips 300 and via holes 400, and the surface of the central laminate 100 is provided with a first input The output terminal S1 and the second input and output terminal S3; also include two grounding side plates S2 and S4, and the two grounding side plates S2 and S4 are located on the sides of the central laminated body 100 .

[0035] In this embodiment, in the filter circuit, the number of the first transmission zero structure and the second transmission zero structure are four respectively; and the first transmission zero structure is a parallel structure of an inductor L and a capacit...

Embodiment 2

[0047] Such as Figure 4 to Figure 7 As shown, compared with Embodiment 1, this embodiment is only different in that: the first transmission zero point structure at the end, like the other three first transmission zero point structures at the front end, adopts a common connection structure, that is, sequential connection Structural implementation:

[0048] That is, the parallel structure of L4 and C4, its input end face a4 is the same as the input and output ends a1, a2, and a3 of the other three first transmission zero point structures, and they are all located on the same side as the first input and output end S1, that is, they are all located at The left side of the parallel connection structure of L4 and C4, and the output end surface b4 is located on the left and right sides of the parallel connection structure of L4 and C4 with the first input and output terminal S1. Compared with the folding structure, this sequential structure is not compact enough. When the parallel ...

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Abstract

The invention provides a miniature multilayer ceramic band-pass filter. The filter comprises a central laminated body and a filter circuit arranged in the central laminated body. The central laminatedbody comprises a plurality of bearing units which are laminated from top to bottom. Each bearing unit is formed by stacking a plurality of layers of dielectric substrates from top to bottom. The filter circuit comprises at least four first transmission zero point structures which are sequentially connected in series and at least four second transmission zero point structures which are sequentially connected in series, each first transmission zero point structure generates a transmission zero point in the stop band above the pass band, and each second transmission zero point structure generates a transmission zero point in the stop band below the pass band; at least one first transmission zero point structure and at least one second transmission zero point structure are respectively used as an arrangement unit, and each arrangement unit is arranged on one bearing unit. According to the invention, at least four transmission zeros can be generated in the stop band above the pass band, and at least four transmission zeros can be generated in the stop band below the pass band, so that the performance is excellent, and a very small size can be ensured.

Description

technical field [0001] The invention relates to a band-pass filter, in particular to a miniature multilayer ceramic band-pass filter. Background technique [0002] Bandpass filters are important passive components in RF systems. An excellent band-pass filter should have low in-band loss, deep out-of-band suppression, wide stop-band suppression range, and also need to have as small a volume as possible. Most of the traditional band-pass filters adopt a planar structure and occupy a large area, which cannot meet the miniaturization requirements of the RF front-end. At the same time, traditional band-pass filters are difficult to integrate. [0003] In the actual design of the bandpass filter, in order to have greater suppression outside the passband, it is necessary to introduce transmission zero points at some specific frequency points. The transmission zero point refers to the filter transfer function equal to zero, that is, from a theoretical point of view , the energy at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/01
CPCH03H7/0115H03H7/0161
Inventor 肖明
Owner YANCHUANG PHOTOELECTRIC TECH GANZHOU
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