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LTCC bandpass filter with harmonic suppression

A band-pass filter and harmonic suppression technology, applied in the field of electronics, can solve problems such as insufficient stop-band attenuation, and achieve the effects of compact structure, low mass production cost, and reduced volume

Inactive Publication Date: 2009-12-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

But for a general bandpass filter, if you want to suppress the clutter frequency or the suppressed harmonic frequency with a strong signal close to the center frequency, the attenuation in the stop band is insufficient.

Method used

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  • LTCC bandpass filter with harmonic suppression
  • LTCC bandpass filter with harmonic suppression
  • LTCC bandpass filter with harmonic suppression

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Embodiment Construction

[0015] Such as figure 1 , 2 As shown, the structure of the LTCC harmonic suppression bandpass filter and its equivalent circuit of the specific embodiment of the present invention have been described in detail in the summary of the invention, so they will not be repeated here, and only the detailed parameters of each part are described as follows:

[0016] Such as image 3 Shown: The thickness of the first and second dielectric substrates is 0.1mm, the thickness of the third dielectric substrate is 0.2mm, and the thickness of the fourth conductor layer is 0.017mm; the metal used in the conductor layers is gold; the dielectric substrate material is Ferro A6M type LTCC ceramic material, its relative permittivity Er is 6.3, dielectric loss tangent tan is 0.001, conductivity σ is 3×10 9 S / m; the volume of the whole device is only 3.5mm×4mm×0.6mm.

[0017] Test results such as Figure 4 As shown, the bandpass filter works at 2.8-3.2G Hz, there is a transmission zero at the harm...

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Abstract

An LTCC bandpass filter with harmonic suppression belongs to the technical field of electronics and relates to bandpass filters with harmonic suppression. The bandpass filter with harmonic suppression is a two-stage bandpass filter with one transmission zero, adopts the prototype of a deformed Chebyshev filter with controllable transmission zeros, realizes elements with equivalent lumped parameters through an LTCC multilayer structure and can greatly reduce the volume of the bandpass filter under the condition of realizing the same technical index. Meanwhile, the bandpass filter can effectively enhance the out-of-band harmonic suppression effect under the condition of using bipolar resonance, thus better giving consideration to the requirements of insertion loss of the bandpass filter on pass bands and stop bands. Besides, the bandpass filter has the advantages that the traditional bandpass filters do not have, including low cost, benefit for batch production, good high-frequency performance and temperature performance and the like. The bandpass filter can be widely applied to the radio frequency wireless communication systems.

Description

technical field [0001] The invention belongs to the field of electronic technology, and relates to a band-pass filter, in particular to a miniaturized low-temperature co-fired ceramic (LTCC) harmonic suppression band-pass filter. Background technique [0002] The microwave and millimeter wave bandpass filter is a key component of the microwave and millimeter wave radio frequency system, especially in the microwave and millimeter wave integrated circuits, the radio frequency front end not only needs the insertion loss of the bandpass filter to be small and the selectivity is good, but also requires the bandpass filter The volume of the device is as small as possible. However, traditional band-pass filters are usually relatively large in size, which cannot meet the requirements of RF front-end for device miniaturization. In addition: the insertion loss of the bandpass filter has different requirements for the passband and the stopband: the insertion loss in the passband is as...

Claims

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Application Information

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IPC IPC(8): H01P1/212H03H7/075
Inventor 邓建华王秉中黄海燕
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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