A Miniature L-Band Laminated Broadband Bandpass Filter
A technology of band-pass filter and frequency band, which is applied in the field of miniature L-band laminated broadband band-pass filter, can solve the problems of unfavorable device miniaturization, increase of filter volume, and low product reliability, etc., and achieve mass production , Improve reliability, and high out-of-band suppression
Active Publication Date: 2018-04-03
NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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Problems solved by technology
Adjusting the relative area of the upper and lower plates can change the coupling of adjacent stages, thereby adjusting the bandwidth, but there are few adjustment parameters and poor flexibility
In order to obtain larger capacitance and inductance, it is necessary to increase the area of the resonant plate or the length of the vertical through hole, which greatly increases the volume of the filter, which is not conducive to the miniaturization of the device, and does not give full play to the advantages of the LTCC stacking process
[0004] The signal end of the filter is often led to the top and bottom layers by side printing. Since the LTCC filter is small in size, reaching the millimeter level, and the leading tap end is only a few tenths of a millimeter, the yield rate is low during side printing and the product is reliable. Sex is not high
Method used
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[0018] The present invention will be further described below in conjunction with accompanying drawing:
[0019] Such as Figure 1-Figure 2 The shown L-band laminated broadband bandpass filter includes a surface-mounted 50-ohm impedance input port a1, a surface-mounted 50-ohm impedance output port a2, a first ground port b1, a second ground port b2, Input inductance c1, output inductance c2, three-stage resonant circuit (s1, s2, s3), first ground plate e1, second ground plate e2 and U-shaped trap circuit u. Wherein, the 50 ohm impedance input port a1 is connected to the input inductor c through the first vertical through hole d1. The 50 ohm impedance output port a2 is connected to the output inductor c2 through the second vertical through hole d2. Both the first vertical through hole and the second vertical through hole are filled with conductive material, and the conductive material is any one or a combination of Ag, Pd, Au, Ag / Pd.
[0020] The three-stage resonant circuit ...
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The invention relates to a miniature L-band laminated broadband bandpass filter, which comprises surface-mounted input port and output port, a first ground port, a second ground port, an input inductor, an output inductor, three stages of resonance circuits, a first ground plate, a second ground plate and a U-shaped trap circuit, wherein the three stages of resonance circuits include a first stage of resonance circuit, a second stage of resonance circuit and a third stage of resonance circuit; the input port is connected to the input inductor through a first vertical through hole; and the output port is connected to the output inductor through a second vertical through hole. The miniature L-band laminated broadband bandpass filter has the characteristics of being small in size, high in reliability, simple and compact in structure, high in yield, excellent in frequency characteristic, high in out-of-band rejection degree, high in processing consistency and the like, and can achieve mass production.
Description
technical field [0001] The invention relates to the technical field of filters, in particular to a miniature L-band laminated broadband bandpass filter. Background technique [0002] Low-temperature co-fired ceramic (LTCC) technology adopts a three-dimensional lamination process, which can embed passive components in ceramic substrates, and can also mount active components on the surface of the substrate to make passive / active integrated functional modules. The three-dimensional structure, layered design, and overall sintering provide a stable, reliable, small-volume, and high-performance electronic packaging form for the device. Compared with LC filters, cavity filters, and dielectric filters, LTCC filters have the characteristics of small size, light weight, stable performance, and high consistency. [0003] In the past, the broadband bandpass filter design of the laminated process often used a lumped parameter resonant circuit and a broadside coupling structure. The reso...
Claims
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IPC IPC(8): H01P1/203
CPCH01P1/2039
Inventor 宗志峰项玮曹狄峰陈晓红
Owner NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC