L-band miniature low-pass filter

A low-pass filter and L-band technology, applied in the electronic field, can solve the problem that the filter cannot meet the requirements, and achieve the effects of light weight, cost reduction, and low loss

Inactive Publication Date: 2013-05-01
NANJING UNIV OF SCI & TECH
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Problems solved by technology

With the increasingly higher volume, weight and performance requirements of microwave de

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Embodiment

[0019] like figure 2 As shown, the low-temperature co-fired ceramics and metal patterns used in the L-band micro low-pass filter of the present invention are fired at 800-900° C. at one time, and have good reliability and temperature stability. The structure adopts three-dimensional integration, multi-layer folding structure and metal shielding on the outer surface to realize grounding and packaging, so that the volume is greatly reduced.

[0020] like figure 2 As shown, the L-band micro low-pass filter of the present invention has a device size of 2mm 1.2mm 1mm, using the relative permittivity of LTCC ceramic dielectric 9.2, the thickness of each layer of ceramic medium with metal layer is 40 microns, the thickness of metal layer is 10 microns, the metal conductor is silver, and the thickness of each layer of ceramic medium without metal layer is 50 microns. The entire LTCC miniature low-pass filter substrate is composed of 20 layers of LTCC ceramic media. All the sur...

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Abstract

The invention discloses an L-band miniature low-pass filter. The low-pass filter has two transmission zeros, the prototype is a fifth-order Chebyshev low-pass filter, an equivalent lumped parameter element is implemented by means of an LTCC (low-temperature co-fired ceramic) multilayered structure, and the L-band miniature low-pass filter comprises two stages of parallel resonant units, three stages of parallel ground capacitors, an input port and an output port; under the same technical index condition, the size of the filter is greatly reduced, and out-of-band harmonics are effectively suppressed. The L-band miniature low-pass filter has the advantages of small size, light weight, high integration degree, little in-passband insertion loss, good standing waves, good high-end suppression, high temperature stability, high consistency in the electrical property indexes of batches, low mass production cost and the like, and is applicable to corresponding communication systems having rigorous requirements on size, weight, performance and reliability, such as radio frequency transceiving front ends.

Description

technical field [0001] The invention belongs to the field of electronic technology, in particular to an L-band miniature low-pass filter. Background technique [0002] With the advancement of modern communication technology, microwave and millimeter wave modules are also developing towards small size, light volume, high reliability and high performance. As an indispensable part of microwave and millimeter wave modules, filters play an important role in the overall communication system. The quality of the performance has a direct impact, not only requiring low insertion loss and good out-of-band suppression, but also requiring small volume and light weight for the new type of filter. At present, conventional filters, such as cavity filters composed of metal resonators, LC filters, microstrip filters, and block dielectric filters, have good performance, but due to their large size, they cannot adapt to today's microwave and millimeter waves. device requirements for miniaturiz...

Claims

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Application Information

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IPC IPC(8): H01P1/205H01P1/203H01P11/00
Inventor 翟克园江坤涂振斌廖佳张玲玲裴晨
Owner NANJING UNIV OF SCI & TECH
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