CN208241640U - A kind of LTCC high-pass filter - Google Patents
A kind of LTCC high-pass filter Download PDFInfo
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- CN208241640U CN208241640U CN201821435591.5U CN201821435591U CN208241640U CN 208241640 U CN208241640 U CN 208241640U CN 201821435591 U CN201821435591 U CN 201821435591U CN 208241640 U CN208241640 U CN 208241640U
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Abstract
The utility model discloses a kind of LTCC high-pass filter, it is by two capacitors and three inductance, the five rank filters that totally five reactance components are constituted, LC series resonance is designed also at the first inductance and third inductance, form transmission zero, inhibited with this to increase stopband, realize these inductance, filter is made on LTCC green surface, and by punching, filling perforation, wire mark, lamination and sintering process in the conductor printing of capacity cell；The connection of this 7 reactance components is realized using LTCC vertical interconnecting structure；Inductance uses vertical spin inductance, realizes the connection between different layers by vertical through hole；Capacitor uses metal-conductor-metallic type structure；It is also connected using perpendicular interconnection between inductance and capacitor.The not no ground plane of full wafer in ltcc substrate, but be connected to the ground by LTCC side electrode, the filter is small in size, at low cost, low with interior Insertion Loss, Out-of-band rejection is high, and band internal stability is high, selectivity is good, is easy to the batch production of device, can be widely applied to Modern wireless communication field.
Description
Technical field
The utility model relates to filter fields, and in particular to a kind of LTCC high-pass filter.
Background technique
Currently, wireless communication technique high speed development, the scope of business constantly expand, and demand of the people to wireless product increases rapidly
Long, high-pass filter just plays important role in these products, and with the development of communication technology and obtain constantly into
Exhibition.While the signal low-loss that its major function is above some frequency passes through, reduction low frequency signal is logical as far as possible
It crosses.One good high-pass filter does not require nothing more than with interior low-loss, with outer high inhibition, and wants cube as small as possible, performance
Stablize.
Traditional high-pass filter generally uses planar structure, in a certain order reactance components such as capacitor, inductance
It lines up, shaping filter, not only area occupied is bigger in this way, but also the insertion loss of filter is larger, and performance is not
It is very ideal, it is not able to satisfy radio circuit to device miniaturization, high performance requirement.
Low-temperature co-fired ceramics is a kind of Electronic Encapsulating Technology, using multi-layer ceramics technique, passive device can be placed in ceramics
Media interior.LTCC technology is in cost, miniaturization, Low ESR technicalization, design diversification and the side such as flexibility and high frequency performance
Face has the advantages that more prominent.LTCC utilizes multi-layer ceramics laminated process, and use is low temperature co-fired, ensure that its media interior can
To carry out internal circuit printing with the higher metal of conductivity (gold, silver etc.), to ensure that preferable conduction loss.
Utility model content
In view of the deficiencies of the prior art, the utility model proposes a kind of LTCC high-pass filter, which uses LTCC
The exclusive vertical interconnecting structure of technology, can be substantially reduced the size of element；Simultaneously effective utilize the coupling between inductance and capacitor
Cooperation is used, and forms a transmission zero in stopband, Stopband Performance is improved, and is had excellent performance out using less order design
High-pass filter.Specific technical solution is as follows:
A kind of LTCC high-pass filter, including input electrode, output electrode and external grounding electrode, which is characterized in that packet
Include the first capacitor C1 and the second capacitor C2 of series connection, the first inductance L1 being connected in parallel, the second inductance L2, third inductance L3
And the third capacitor C3 and the 4th capacitor C4 of series resonance are respectively formed with first, third inductance L1, L3, realize these electricity
Feel, filter is made on LTCC green surface, and by punching, filling perforation, wire mark, lamination and sintering process in the conductor printing of capacity cell
Wave device；The connection of this 7 reactance components is realized using LTCC vertical interconnecting structure；Inductance uses vertical spin inductance, by hanging down
Clear opening realizes the connection between different layers；Capacitor uses metal-conductor-metallic type structure；It is also used between inductance and capacitor
Perpendicular interconnection connection；
Including multilayer LTCC ceramic substrate, wherein the input terminal electrode and output terminal electrode are respectively arranged on the filtering
Opposite end on device length direction, the ground connection termination electrode are set on the outside of the middle part on filter length direction；
Inductance, capacitor use vertical interconnecting structure, and capacitor is located above filter housing construction, and inductance is located at filter machine
Below body structure；
First, second, third inductance L1, L2, L3 realizes that different ceramics are situated between using the spiral inductance on multiple layer ceramic dielectric
Metallic conductor in matter is connected by through-hole, and by adjusting the wire length of every layer of spiral inductance line, line width adjusts each capacitance；
First, second, third, fourth capacitor C1, C2, C3, C4 is real by the plane capacitance pole plate of multiple layer ceramic dielectric layer
Existing, the capacitor plate between different ceramic dielectric layers is by the realization interconnection that intercouples between pole plate, by adjusting the ruler of pole plate
It is very little to adjust each capacitance；
The circuit part of the filter shares 11 layers, and first capacitor, second capacitor C1, C2 are located at the three-dimensional electricity of filter
Road the 1st, 2,3 floor；First capacitor, second capacitor C1, C2 are connected by the metal polar plate coupling on the 3rd layer；
The beginning of first inductance L1 passes through through-hole phase on the 4th, 5 layer, and with the metal polar plate on the 2nd layer of first capacitor C1
Even, end is connected on the 6th, 7 layer, and with the grounding electrode of filter flanks；
The beginning of second inductance L2 is connected on the 8th, 9 layer, and through through-hole with the metal polar plate of third layer, and end is the
10, on 11 layers, and it is connected with the grounding electrode of filter flanks；
The beginning of third inductance L3 passes through through-hole phase on the 4th, 5 layer, and with the metal polar plate on the 2nd layer of the second capacitor C2
Even, end is connected on the 6th, 7 layer, and with the grounding electrode of filter flanks；
The 2nd layer of pole plate of first capacitor C1 and the 3rd layer of filter three-dimensional circuit of connection pole plate are coupled out third capacitor C3,
It is connected in series with the first inductance L1, forms series resonance, generate transmission zero；
The 2nd layer of pole plate of second capacitor C2 and the 3rd layer of filter three-dimensional circuit of connection pole plate are coupled out the 4th capacitor C4,
It is connected in series with third inductance L3, forms series resonance, generate transmission zero.
Further, first capacitor C1 is the input terminal of filter；Second capacitor C2 is the output end of filter；First electricity
One end of sense L1 is connected to the 2nd layer of pole plate of first capacitor C1, and the other end is connected with ground；One end of third inductance L3 is connected to
The 2nd layer of pole plate of two capacitor C2, the other end are connected with ground；One end of second inductance L2 is connected to the 3rd layer of the first, second capacitor
On the pole plate of C1, C2, the other end is connected with ground.
Further, first capacitor C1, the second capacitor C2 are in mirror symmetry in structure, and plate dimensions are identical；First electricity
Feeling L1, third inductance L3 in structure is in mirror symmetry, is all four layers of spiral inductance, size is identical.
Further, the zero point that series resonance described in two is formed in same position, by adjust the first inductance L1 and
The value or third capacitor C3 of third inductance L3 and the value of the 4th capacitor C4 adjust resonance frequency, to meet stopband requirement.
Further, the overall dimensions of filter are 3.2mm × 1.6mm × 0.95mm.
Further, the cutoff frequency of the filter is 0.5GHz, and maximum loss is 1.6dB in passband, in frequency
Range 0-0.4GHz, decaying are all larger than 25dB.
The beneficial effects of the utility model are as follows:
The utility model makes full use of multi-layer ceramics lamination process, and the vertical interconnecting structure exclusive using LTCC technology,
The size of element can be substantially reduced；Simultaneously effective using the coupling between inductance and capacitor, transmission zero is formed in stopband
Point, Stopband Performance are improved, and design the high-pass filter haveing excellent performance using less order and element.
Detailed description of the invention
Fig. 1 is the equivalent circuit schematic of the LTCC high-pass filter of the utility model；
Fig. 2 is the outline drawing of the LTCC high-pass filter of the utility model；
Fig. 3 is the facing structure figure of the LTCC high-pass filter of the utility model；
Fig. 4 is the 1st layer of 3D structure chart of the LTCC high-pass filter of the utility model；
Fig. 5 is the 2nd layer of 3D structure chart of the LTCC high-pass filter of the utility model；
Fig. 6 is the 3rd layer of 3D structure chart of the LTCC high-pass filter of the utility model；
Fig. 7 is the 4th layer of 3D structure chart of the LTCC high-pass filter of the utility model；
Fig. 8 is the 5th layer of 3D structure chart of the LTCC high-pass filter of the utility model；
Fig. 9 is the 6th layer of 3D structure chart of the LTCC high-pass filter of the utility model；
Figure 10 is the 7th layer of 3D structure chart of the LTCC high-pass filter of the utility model；
Figure 11 is the 8th layer of 3D structure chart of the LTCC high-pass filter of the utility model；
Figure 12 is the 9th layer of 3D structure chart of the LTCC high-pass filter of the utility model；
Figure 13 is the 10th layer of 3D structure chart of the LTCC high-pass filter of the utility model；
Figure 14 is the 11th layer 3D structure chart of the LTCC high-pass filter of the utility model；
Figure 15 is the S11 simulation result diagram of the LTCC high-pass filter of the utility model；
Figure 16 is the S21 simulation result diagram of the LTCC high-pass filter of the utility model；
Figure 17 is the standing-wave ratio simulation result diagram of the LTCC high-pass filter of the utility model.
Specific embodiment
The utility model is described in detail below according to attached drawing and preferred embodiment, the purpose of this utility model and effect will become
It must be more clearly understood that, below in conjunction with drawings and examples, the present invention will be further described in detail.It should be appreciated that herein
Described specific embodiment is only used to explain the utility model, is not used to limit the utility model.
Fig. 1 is the equivalent circuit schematic of the LTCC high-pass filter of the utility model, as shown in Figure 1, the utility model
LTCC high-pass filter include two basic capacitor C1, C2；Three inductance L1, L2, L3；Two series resonant capacitances C3, C4.
Capacitor C1, C2, inductance L1, L2, L3 link together according to certain topological structure relationship and realize the basic training of high-pass filter
Energy.First inductance L1 and third inductance L3 constitutes series resonance with third capacitor C3, the 4th capacitor C4 respectively, is formed and is passed in stopband
Defeated zero point, the value by changing inductance L1, L3 and capacitor C3, C4 can change the position of transmission zero, improve the property of filter
Energy.
Fig. 2 is the outline drawing for the high-pass filter realized using LTCC technology.Filter shape includes a LTCC pottery
Porcelain substrate.Grounding electrode of the welding metal conductor strip as filter has been printed on the outside of the middle part on substrate length direction
GND；Opposite end on filter substrate length direction covers input electrode of the solderable metal conductor as filter
IN and output electrode OUT.It only needs that filter is welded on related circuit by metal electrode according to correct method when use
On plate.
LTCC high-pass filter outer dimension is 3.2mm × 1.6mm × 0.95mm in the present embodiment, used LTCC pottery
Ceramic dielectric relative dielectric constant is 9.8, loss angle tangent 0.003, every layer of ceramic dielectric with a thickness of 0.05mm, metallic conductor
Material is metallic silver.
Fig. 3 is LTCC high-pass filter facing structure figure.Circuit integrally uses vertical interconnecting structure.In Fig. 3, filter
Four capacitors are all made of MIM formula structure, and pass through the coupling interconnection between pole plate.Four capacitor settings are in LTCC filter electricity
The 1st, the 2 of road, 3 layers, main purpose is to reduce their parasitic capacitance over the ground, improves performance of filter.First capacitor C1 and
Two capacitor C2 are in left and right mirror symmetry in structure, and the size of pole plate and the capacitance of capacitor are equal.The pole plate of capacitor C1, C2 point
It Wei Yu not be the 1st, 2,3 layer of filter circuit.The the 1st, 3 layer of capacitor C1 is connected with filter input end；The the 1st, 3 layer of capacitor C2 with
The output end of filter is connected.The 2nd layer of pole plate of capacitor C1 couples phase by the 3rd layer of circuit of pole plate with the 2nd layer of pole plate of capacitor C2
Connect, formation capacitor C1 connects with capacitor C2's.Meanwhile the 2nd layer of pole plate of capacitor C1 connect pole plate with third layer and is coupled out capacitor C3,
It is connected by through-hole with the one end inductance L1, constitutes L1 and C3 series resonance；The 2nd layer of pole plate of capacitor C2 connect pole plate coupling with third layer
Capacitor C4 is closed out, is connected by through-hole with the one end inductance L3, L3 and C4 series resonance are constituted.
In Fig. 3, the inductance of filter is arranged at the 4th, 5,6,7 layer and the 8th, 9,10,11 layer of circuit of circuit.Inductance L1,
L2, L3 are all made of 4 layers of helical structure, and the metallic conductor on different medium layer is connected by through-hole.Inductance L1 and inductance L3 structure
Upper symmetrical in mirror surface, the line width and wire length of metal conduction band are equal, and inductance value L1 is equal with L3.The beginning of inductance L1 is at the 4th, 5 layer
On, and be connected with the metal polar plate on the 2nd layer of first capacitor C1 by through-hole, end is on the 6th, 7 layer, and and filter flanks
Grounding electrode be connected；The beginning of inductance L2 connects pole plate with the metal of third layer by through-hole and is connected on the 8th, 9 layer,
End is connected on the 10th, 11 layer, and with the grounding electrode of filter flanks；The beginning of inductance L3 is on the 4th, 5 layer, and with
Metal polar plate on two the 2nd layer of capacitor C2 is connected by through-hole, end on the 6th, 7 layer, and with the ground connection of filter flanks electricity
Extremely it is connected.Filter capacity, inductance specific structure as described in Fig. 4-14.
Figure 15-17 is the utility model LTCC high-pass filter the simulation results figure.As shown, the high-pass filter
Cutoff frequency be 0.5GHz.Logical in-band insertion loss is not more than 1.6dB, and in frequency range DC-0.4GHz, stopband inhibits not small
In 25dB, passband standing internal wave ratio (VSWR) is not more than 2.5.
To sum up, LTCC high-pass filter provided by the utility model has small in size, and insertion loss is small, and Out-of-band rejection is high
Feature can carry out patch, welding, convenient for integrated with other microwave components.And the utility model be based on LTCC technique,
Manufacturing cost is low, suitable for mass production.
It will appreciated by the skilled person that the foregoing is merely the preferred embodiments of utility model, and do not have to
In limitation utility model, although utility model is described in detail referring to previous examples, for those skilled in the art
Member for, can still modify to the technical solution of aforementioned each case history, or to part of technical characteristic into
Row equivalent replacement.With within principle, modification, equivalent replacement for being made etc. should be included in practical new all spirit in utility model
Within the protection scope of type.
Claims (6)
1. a kind of LTCC high-pass filter, including input electrode, output electrode and external grounding electrode, which is characterized in that including
The first capacitor C1 of series connection and the second capacitor C2, the first inductance L1 being connected in parallel, the second inductance L2, third inductance L3 with
And the third capacitor C3 and the 4th capacitor C4 of series resonance are respectively formed with first, third inductance L1, L3, realize these inductance,
Filtering is made on LTCC green surface, and by punching, filling perforation, wire mark, lamination and sintering process in the conductor printing of capacity cell
Device；The connection of this 7 reactance components is realized using LTCC vertical interconnecting structure；Inductance uses vertical spin inductance, by vertical
Through-hole realizes the connection between different layers；Capacitor uses metal-conductor-metallic type structure；Also using vertical between inductance and capacitor
Straight mutual downlink connection；
Including multilayer LTCC ceramic substrate, wherein it is long that the input terminal electrode and output terminal electrode are respectively arranged on the filter
The opposite end on direction is spent, the ground connection termination electrode is set on the outside of the middle part on filter length direction；
Inductance, capacitor use vertical interconnecting structure, and capacitor is located above filter housing construction, and inductance is located at filter body knot
Below structure；
First, second, third inductance L1, L2, L3 is realized using the spiral inductance on multiple layer ceramic dielectric, on different ceramic dielectrics
Metallic conductor connected by through-hole, by adjusting the wire length of every layer of spiral inductance line, line width adjusts each capacitance；
First, second, third, fourth capacitor C1, C2, C3, C4 passes through the plane capacitance pole plate realization of multiple layer ceramic dielectric layer, no
With the capacitor plate between ceramic dielectric layer by the intercoupling realization interconnection between pole plate, adjusted by adjusting the size of pole plate
Save each capacitance；
The circuit part of the filter shares 11 layers, and first capacitor, second capacitor C1, C2 are located at filter three-dimensional circuit
1st, 2,3 layer；First capacitor, second capacitor C1, C2 are connected by the metal polar plate coupling on the 3rd layer；
The beginning of first inductance L1 is connected on the 4th, 5 layer, and with the metal polar plate on the 2nd layer of first capacitor C1 by through-hole,
End is connected on the 6th, 7 layer, and with the grounding electrode of filter flanks；
The beginning of second inductance L2 is connected on the 8th, 9 layer, and through through-hole with the metal polar plate of third layer, end the 10th,
On 11 layers, and it is connected with the grounding electrode of filter flanks；
The beginning of third inductance L3 is connected on the 4th, 5 layer, and with the metal polar plate on the 2nd layer of the second capacitor C2 by through-hole,
End is connected on the 6th, 7 layer, and with the grounding electrode of filter flanks；
The 2nd layer of pole plate of first capacitor C1 and the 3rd layer of filter three-dimensional circuit of connection pole plate are coupled out third capacitor C3, with the
One inductance L1 is connected in series, and forms series resonance, generates transmission zero；
The 2nd layer of pole plate of second capacitor C2 and the 3rd layer of filter three-dimensional circuit of connection pole plate are coupled out the 4th capacitor C4, with the
Three inductance L3 are connected in series, and form series resonance, generate transmission zero.
2. LTCC high-pass filter according to claim 1, which is characterized in that first capacitor C1 is the input of filter
End；Second capacitor C2 is the output end of filter；One end of first inductance L1 is connected to the 2nd layer of pole plate of first capacitor C1, separately
One end is connected with ground；One end of third inductance L3 is connected to the 2nd layer of pole plate of the second capacitor C2, and the other end is connected with ground；Second
One end of inductance L2 is connected on the 3rd layer of the pole plate of first, second capacitor C1, C2, and the other end is connected with ground.
3. LTCC high-pass filter according to claim 1, which is characterized in that first capacitor C1, the second capacitor C2 are being tied
It is in mirror symmetry on structure, plate dimensions are identical；First inductance L1, third inductance L3 are in mirror symmetry in structure, are all four layers
Spiral inductance, size are identical.
4. LTCC high-pass filter according to claim 3, which is characterized in that the zero of the formation of series resonance described in two
Point is in same position, by adjusting the value of the first inductance L1 and third inductance L3 or the value of third capacitor C3 and the 4th capacitor C4
Resonance frequency is adjusted, to meet stopband requirement.
5. LTCC high-pass filter according to claim 1, which is characterized in that the overall dimensions of filter be 3.2mm ×
1.6mm×0.95mm。
6. LTCC high-pass filter according to claim 1, which is characterized in that the cutoff frequency of the filter is
0.5GHz, maximum loss is 1.6dB in passband, and in frequency range 0-0.4GHz, decaying is all larger than 25dB.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821435591.5U CN208241640U (en) | 2018-09-03 | 2018-09-03 | A kind of LTCC high-pass filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821435591.5U CN208241640U (en) | 2018-09-03 | 2018-09-03 | A kind of LTCC high-pass filter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109889176A (en) * | 2019-04-01 | 2019-06-14 | 中国计量大学上虞高等研究院有限公司 | A kind of 5G high-performance LTCC bandpass filter inhibiting higher hamonic wave |
| CN110995193A (en) * | 2019-11-25 | 2020-04-10 | 南京理工大学 | Novel reflection-free high-pass filter based on LTCC |
| CN110994087A (en) * | 2019-11-25 | 2020-04-10 | 中国计量大学上虞高等研究院有限公司 | High-low-pass parallel LTCC band elimination filter |
| CN112994641A (en) * | 2021-02-05 | 2021-06-18 | 北京邮电大学 | LTCC-based dual-frequency band-pass filter chip |
| CN113037239A (en) * | 2021-02-23 | 2021-06-25 | 安徽安努奇科技有限公司 | Filter and electronic device |
| CN113824417A (en) * | 2021-08-02 | 2021-12-21 | 桂林理工大学 | 5G high-pass LTCC filter |
-
2018
- 2018-09-03 CN CN201821435591.5U patent/CN208241640U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109889176A (en) * | 2019-04-01 | 2019-06-14 | 中国计量大学上虞高等研究院有限公司 | A kind of 5G high-performance LTCC bandpass filter inhibiting higher hamonic wave |
| CN110995193A (en) * | 2019-11-25 | 2020-04-10 | 南京理工大学 | Novel reflection-free high-pass filter based on LTCC |
| CN110994087A (en) * | 2019-11-25 | 2020-04-10 | 中国计量大学上虞高等研究院有限公司 | High-low-pass parallel LTCC band elimination filter |
| CN110994087B (en) * | 2019-11-25 | 2021-01-26 | 中国计量大学上虞高等研究院有限公司 | High-low-pass parallel LTCC band elimination filter |
| CN110995193B (en) * | 2019-11-25 | 2022-10-28 | 南京理工大学 | LTCC-based non-reflection high-pass filter |
| CN112994641A (en) * | 2021-02-05 | 2021-06-18 | 北京邮电大学 | LTCC-based dual-frequency band-pass filter chip |
| CN112994641B (en) * | 2021-02-05 | 2022-06-28 | 北京邮电大学 | LTCC-based dual-frequency band-pass filter chip |
| CN113037239A (en) * | 2021-02-23 | 2021-06-25 | 安徽安努奇科技有限公司 | Filter and electronic device |
| CN113824417A (en) * | 2021-08-02 | 2021-12-21 | 桂林理工大学 | 5G high-pass LTCC filter |
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