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LTCC band-pass filter with spurious spikes suppressed vertically-interdigital capacitor

A technology of band-pass filter and interdigital capacitor, applied in the direction of waveguide type devices, circuits, electrical components, etc., to achieve the effect of high performance, reliability and high reliability

Inactive Publication Date: 2017-07-18
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While all VICs exhibit this problem when designed and constructed, there is no literature exploring the capacitance and spurious spike suppression of multilayer VICs.

Method used

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  • LTCC band-pass filter with spurious spikes suppressed vertically-interdigital capacitor
  • LTCC band-pass filter with spurious spikes suppressed vertically-interdigital capacitor
  • LTCC band-pass filter with spurious spikes suppressed vertically-interdigital capacitor

Examples

Experimental program
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Embodiment Construction

[0020] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] The invention proposes a 10-layer low-temperature co-fired ceramic (LTCC) filter of miniature lumped elements aiming at an extremely low center frequency of 60 MHz. Miniaturization is realized by using a high-impedance line to realize a spiral inductor and a stray suppression type vertical interdigitated capacitor (SVIC). By connecting the open ends of the spacer fingers with vertical vias, vertical interdigitated capacitor (VIC) capacitance increases and spur suppression are achieved without Q degradation.

[0022] For the purpose of miniaturization, a circuit topology with fewer components is chosen. In order to make the designed bandpass filter have a bandwidth of 15MHz at a center frequency of 60MHz, a known circuit model with eight elements is selected, as figure 1 shown. C 3 A feedback capacitor is introduced between...

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Abstract

The invention discloses a miniature lumped-element LTCC band-pass filter, and a spurious spikes suppressed vertically-interdigital capacitor and a spiral inductor which are employed by the LTCC band-pass filter. The band-pass filter includes a spurious spikes suppressed vertically-interdigital capacitor and a three-dimensional spiral inductor. The band-pass filter is characterized in that the filter is of an even-layer structure, the spurious spikes suppressed vertically-interdigital capacitor is connected with the three-dimensional spiral inductor on the top layer of the filter through a microstrip line, in the spurious spikes suppressed vertically-interdigital capacitor, open circuit ends of spacing fingers are connected through vertical through holes, and the capacitor is provided with defect structures. Aiming at 60MHz ultra-low center frequency, a miniature lumped-element 10-layer LTCC filter is provided, by using high impedance lines, miniaturization, high performance and reliability of the spiral inductor and the spurious spikes suppressed vertically-interdigital capacitor can be achieved.

Description

technical field [0001] The invention belongs to the field of electronic devices, and in particular relates to a miniaturized lumped parameter LTCC band-pass filter and a stray-suppressing interdigitated capacitor and a spiral inductor adopted therefor. Background technique [0002] Band-Pass Filter (BPF) is an essential key component in the development of modern System in Package (SiP). It is also one of the largest components, especially in superheterodyne receivers for frequency conversion to the lower Intermediate Frequency (IF) band (most of the f IF <200MHz) later. To achieve miniaturization at these extremely low frequencies, low temperature co-fired ceramics (Low Temperature Co-fired Ceramic, LTCC) are suitable for building lumped parameter filters due to the high level of integration in the vertical direction. Few literatures have used LTCC technology to realize bandpass filters at frequencies of tens of megahertz, and the large wavelength makes size reduction v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203
CPCH01P1/203
Inventor 颜立炜欧阳秋生周波
Owner NANJING UNIV OF POSTS & TELECOMM
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