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Laminated sheet type low pass filter for CATV

A low-pass filter and chip technology, applied in the direction of impedance network, electrical components, single-ended pair network, etc., can solve the problems of unfavorable large-scale mass production, poor product repeatability, poor performance consistency, etc., and achieve high enhancement Frequency quality factor, low cost, effect of reduced quantity

Active Publication Date: 2014-07-16
SHENZHEN SUNLORD ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The produced filters are large in size, low in production efficiency, long in delivery time, poor in product repeatability (i.e. poor in performance consistency), high in cost, and unfavorable for mass production, etc.

Method used

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  • Laminated sheet type low pass filter for CATV
  • Laminated sheet type low pass filter for CATV
  • Laminated sheet type low pass filter for CATV

Examples

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Embodiment Construction

[0020] Such as figure 1 As shown, the multilayer chip low-pass filter for CATV of the present invention is an LTCC laminated structure embedded in a high-frequency ceramic body, and its equivalent circuit is a seven-order low-pass filter, which is composed of three groups of horizontal parallel connections The LC resonant branch and four sets of longitudinal grounding capacitor branches are formed.

[0021] The transverse LC resonant branches are from left to right (with figure 1 The paper is the reference direction) are the first inductance L1 and the first capacitance C1, the second inductance L2 and the second capacitance C2, the third inductance L3 and the third capacitance C3; the longitudinal LC resonance branch is from left to right (the reference direction is the same as above ) respectively the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6 and the seventh capacitor C7.

[0022] The connection terminal of the first inductor L1 and the fourth cap...

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Abstract

The invention discloses a laminated sheet type low pass filter for a CATV. The laminated sheet type low pass filter is small in size, low in cost and high in Q value and conductivity and is of an LTCC structure. The laminated sheet type low pass filter comprises a ceramic body and conductive coatings, wherein the ceramic body is formed by a plurality of layers of substrates made of high-frequency ceramic membranes, and the substrates are coated with the conductive coatings. Three laminated inductors formed by at least four sets of laminated sheets coated with three semi-elliptic or semicircular independent conductive coatings are arranged in the ceramic body. According to the laminated sheet type low pass filter for the CATV, the LTCC technology multi-layer structure is adopted to manufacture the seven-order low pass filter with three transmission zeros, and an original elliptic filter is adopted to improve the circuit characteristic through coupling between the laminated spiral inductors. The size of the laminated sheet type low pass filter is 3.2 mm*2.5 mm*1.0 mm, the LTCC technology is adopted, the cost is low, and mass production can be achieved. In addition, the conductive coatings on every two substrates in the laminated inductors of the low pass filter are connected in parallel, the sectional area of a coil is increased, and therefore the high frequency quality factor of the filter is improved.

Description

technical field [0001] The invention relates to an LTCC laminated chip filter, in particular to a laminated chip low-pass filter for CATV (the full name of CATV is cable television, and the Chinese name is cable television). Background technique [0002] In the prior art, the low-pass filter used to distinguish between CATV (5MHz-1002MHz) and MoCA (English full name Multimedia over Coax Alliance, Chinese name Coaxial Cable Multimedia Alliance) signal D-band (extended D Band 1125MHz-1675MHz) adopts Most of the LC resonant circuit components are air-core coil inductors or wire-wound inductors. It is connected to the designed PCB circuit board through manual soldering or SMT (English full name Surface Mounted Technology, Chinese name: Surface Mount Technology) process. Generally, the circuit has extremely high requirements on the accuracy of the relevant parameter values ​​of the LC components. In production, it is necessary to debug the LC circuit in each filter. If necessary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H5/00
Inventor 漆珂伍隽包承育庞新锋
Owner SHENZHEN SUNLORD ELECTRONICS
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