Micro ultra-wide-band band-pass LC filter

Abstract

The invention provides a micro ultra-wide-band band-pass LC filter. According to the filter, winding magnetic rings with small temperature drift, good stability, and high Q value are employed, and 0603 packaging capacitors are employed so that the electrical performance index of the filter is greatly increased; a special shell package is provided so that the mechanical performance of the filter can be enhanced, and the filter can be applied in the severe environment; and the design of a three-layer structure at a PCB is provided so that signal interference can be effectively shielded, and input, output, and grounding signals can be perfectly transmitted to the PCB and components. According to the micro ultra-wide-band band-pas LC filter, based on the design principle of small size, ultra-large bandwidth, and high rectangular degree, a transfer function expansion equation of the filter is designed, the match of the capacitors and inductors is realized strictly according to equation parameters, and the filter is advantaged by many mechanical and electrical performances such as micro packaging, ultra-large bandwidth, low insertion loss, high rectangular degree, and high stop-band suppression etc.

Description

Technical field [0001] The invention relates to the field of filters, in particular to a miniature ultra-wideband band-pass LC filter. Background technique [0002] With the development of radio frequency technology, the requirements for filter frequency indicators are becoming more and more stringent. The transceiver channels of some commonly used communication equipment need to use filters with larger bandwidths to meet the increasing amount of information transmission and broad bandwidth. But at the same time, the requirements for volume are becoming more and more demanding, and the volume must be "miniaturized". Under this premise, there is an urgent need for a broadband bandpass filter with "small insertion loss", "small size", "small in-band fluctuation", "good rectangular coefficient" and "stable performance". [0003] However, there is a certain degree of paradox between the size and performance of the filter. In the prior art, taking the 21.4MHz frequency range as an exam...

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Problems solved by technology

[0003] However, there is a certain degree of paradox between the size and performance of the filter. In the prior art, taking the 21.4MHz frequency band as an example, it usually requires Surface acoustic wave filters are used, but with the increase of frequency bandwidth, the insertion loss of surface acoustic wave filters also increases, and the difficulty of realization is also increasing. At present, the existing surface acoustic wave filters operate at 21.4MHz frequency However, if the bandwidth reaches 20MHz at this frequency point, it is difficult for the corresponding LC filter to take into account the performance and size, that is, there are the following problems: if the Q value of the inductor is guaranteed, then The minimum size can only be 27mm*15mm*10mm; if it is reduced to the same size, the parameters related to the Q value cannot be guaranteed

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