A UWB Differential Line Common Mode Noise Filter
A common mode noise and differential line technology, applied in the field of communication, can solve problems such as low common mode noise, and achieve the effects of common mode noise suppression, easy implementation and convenient processing
Active Publication Date: 2020-11-20
FUDAN UNIV
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the deficiencies and defects in the existing differential line common mode noise suppression technology, and provide an ultra-wideband differential line common mode noise filter, the filter structure has ultra-wideband, low common mode noise and other characteristics
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[0021] Below in conjunction with accompanying drawing and embodiment, the present invention will be further described: present embodiment is carried out under the premise of technical scheme of the present invention, has provided detailed implementation mode and concrete operation process, but protection scope of the present invention is not limited to the following the described embodiment.
[0022] As shown in the figure, the present invention provides an ultra-wideband differential line common-mode noise filter with an overall size of 42mm×18mm×1.1mm (length×width×height). This embodiment includes: differential pair units 1 and 2, Dielectric integrated waveguide common mode filter structure 3 , ground plate 4 .
[0023] Such as figure 1 As shown, the differential pair units 1 and 2 described in this embodiment are the same, and their basic structure includes parallel coupling lines with a width of 0.35 mm and connected metal patches with a width of 2 mm extending to both s...
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The invention belongs to the technical field of communication and particularly relates to an ultra-wideband differential line common mode noise filter. The ultra-wideband differential line common modenoise filter consists of a differential line pair, a dielectric integrated waveguide common mode noise filter and a metal floor, wherein the common mode noise filter is composed of cascaded dielectric integrated waveguide units of different widths, placed between the top differential line and a metal backplane to suppress common mode noise of the differential lines, and the dielectric integratedwaveguide units consist of upper metal patches, metal through holes on both sides and ground planes. The differential line common mode noise filter is advantaged in that dielectric integrated waveguide units with different widths correspond to different cutoff frequencies, and thereby ultra-wideband common mode noise suppression of the differential lines is realized, and the differential line common mode noise filter has ultra-wideband, high suppression characteristics, simple structure, convenient processing and easy implementation.
Description
technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an ultra-wideband differential line common-mode noise filter. Background technique [0002] Differential line refers to a pair of parallel coupled transmission lines with equal-amplitude and anti-phase signals. Compared with traditional single-ended signal transmission lines, differential lines have strong anti-interference and noise capabilities, are less affected by external electromagnetic interference, and have the advantages of accurate timing positioning. Therefore, It is widely used in microwave and high-speed circuits. [0003] However, in actual circuit design, due to processing errors or wiring limitations, the actual differential line often cannot guarantee strict symmetry, and a common-mode current signal will be excited at this time. When the common mode noise passes through the interconnection lines of the system package structure, it will cause s...
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IPC IPC(8): H01P1/20
CPCH01P1/2002
Inventor 李晓莱杨国敏徐丰金亚秋
Owner FUDAN UNIV