LTCC low-pass filter

Abstract

The invention discloses an LTCC low-pass filter. The LTCC low-pass filter comprises transmission ports and further comprises a ceramic body and reactance components, wherein the reactance components are located in the ceramic body to form a metal layer with a multilayer structure; the reactance components comprise a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a seventh inductor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor; the first inductor, the third inductor, the fifth inductor and the seventh inductor are located from the first layer to the second layer of the metal layer, the second inductor is located at the fifth layer and the sixth layer of the metal layer, and the fourth inductor and the sixth inductor are located from the fifth layer to the eighth layer of the metal layer; the first capacitor, the second capacitor, the third capacitor and the fourth capacitor are located at theninth layer and the tenth layer of the metal layer; and the reactance components realize conducting through circular through-hole columns. The LTCC low-pass filter has high suppression degree, largecut-off frequency sideband steepness, relatively smaller standing-wave ratio, excellent impedance matching performance and perfect filter frequency selection characteristic.

Description

technical field [0001] The invention relates to the technical field of low-pass filters, in particular to an LTCC low-pass filter. Background technique [0002] Low-temperature co-fired ceramic technology (LTCC) is one of the MCM-C (ceramic substrate multi-chip components), which uses multi-layer ceramics printed with metal patterns as the substrate material, and fills metal paste (usually silver) by drilling holes. ) to form an interconnection structure, on the one hand, it can be used as a perfect substitute for traditional PCB substrates that are fatigued in performance and life under harsh environmental conditions; Passive components, such as filters, baluns, antennas. As a key component of the RF front-end, the filter has a direct impact on the performance of the entire module and even the entire system, so it is of great significance to study the filter. [0003] Filters can be roughly divided into three categories according to the frequency response: Butterworth typ...

AI Technical Summary

Problems solved by technology

Beginners generally use the Chebyshev type, because it can take into account both attenuation characteristics and passband flatness; if the passband flatness requirements are high, the Butterworth type is used; and the elliptic function controls the transmission zero in the stopband, The attenuation characteristics have obvious advantages. The high-steepness low-pass filter designed in this technical scheme adopts an improved elliptic function type, which is to solve the poor frequency selection characteristics of the filter based on the elliptic function type in the prior art, which cannot satisfy Requirements for frequency selection characteristics of Beidou navigation system and GPS navigation system

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