CN2737067Y - Low pass filter and multi-layer low pass filter with broadband suppression - Google Patents
Low pass filter and multi-layer low pass filter with broadband suppression Download PDFInfo
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- CN2737067Y CN2737067Y CN 200420001815 CN200420001815U CN2737067Y CN 2737067 Y CN2737067 Y CN 2737067Y CN 200420001815 CN200420001815 CN 200420001815 CN 200420001815 U CN200420001815 U CN 200420001815U CN 2737067 Y CN2737067 Y CN 2737067Y
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Abstract
The utility model provides a low pass filter and multi-layer low pass filter with broadband suppression, which makes use of less components to reach the component miniaturization and have the advantages of same electrical property of the traditional low pass filter. The low pass filter with broadband suppression comprises a signal input end, a signal output end, a first inductance coupled to the signal input end, a second inductance coupled between the first inductance and the signal output end, a first capacitance coupled between the signal input end and the signal output end, a second capacitance coupled between the signal input end and a grounding end, a third capacitance coupled between the first and second inductances and the grounding end and a fourth capacitance coupled between the signal output end and the grounding end. Otherwise, the utility model also makes use of a multi-layer low-temperature co-fired ceramic technique (LTCC) to produce the low pass filter with the broadband suppression into the multi-layer low pass filter with the broadband suppression and makes the low pass filter with the broadband suppression reach the purpose of component miniaturization so as to reduce the occupying area of the line arrangement.
Description
Technical field
The utility model relates to a kind of low pass filter that the broadband suppresses that has, be particularly related to and utilize the low temperature co-fired technology of multi-layer ceramics (Multi-layer Low Temperature Co-fired Ceramic, a kind of multilayer low pass filter LTCC) with broadband inhibition.
Background technology
The communication technology is maked rapid progress, product more and more is required compact, and superperformance is arranged, because the low temperature co-fired technology of multi-layer ceramics (Multi-layer Low Temperature Co-firedCeramic, LTCC) in the application of high frequency, excellent electric characteristics is arranged, because mostly the high-frequency filter circuit of communication products front end transmitting-receiving all the time or switch module are to realize with this.On the field of this ceramic communications component, how effectively to reach circuit integrated long-pending bodyization and dwindle size of components, it is the individual problem deeply concerned of making us always, in order to reach the target of component miniaturization, there is both direction can go effort, one is improvement material system (diminishing such as dielectric constant raising, bed thickness), moreover is the improvement of circuit framework and topology layout.
And along with under the compact trend of communication products, the integration of the inner separate type assembly of communication products can't be avoided.Wherein (Multi-layer Low TemperatureCo-fired Ceramic is LTCC) because of having good high frequency characteristics, so be widely used on the wireless communication module for the low temperature co-fired technology of multi-layer ceramics.
On mobile phone was used, prime transceiver module (Front End Module) was an application example.This module comprises: duplexer (diplexer), pair of switches circuit (switch) and two low pass filters (low pass filter).Wherein low pass filter is a significant components, and this assembly mainly is that the outer harmonic wave of frequency band that power amplifier (power amplifier) is launched is done suitable decay, is the significant components that meets security regulations.
Fig. 1 represents the circuit diagram of the low pass filter of a prior art; Fig. 2 represents the structure chart of the low pass filter of a prior art; Fig. 3 represents the frequency response chart of the low pass filter of a prior art.As depicted in figs. 1 and 2, low pass filter comprises that one the 5th capacitor C 5 and one the 3rd inductance L 3 are couple between a signal input part I1 and the signal output part I2, one the 6th capacitor C 6 is couple to signal input part I1 and one with reference between the earth terminal GND and one the 7th capacitor C 7 is couple to signal output part I2 and with reference between the earth terminal GND, as from the foregoing, conventional lowpass filter has the simple advantage of framework, but have only a cut-off frequency (cutoff frequency) (fp1) (as shown in Figure 3), can't cause the inhibition zone (rejection band) of wideband.If cause the inhibition zone of wideband, then need use second-order low-pass filter (second order low pass filter) cause two cut-off frequencies (fp1, fp2).
Fig. 4 represents the circuit diagram of the low pass filter with broadband inhibition of another prior art; Fig. 5 represents the structure chart of the low pass filter with broadband inhibition of another prior art; Fig. 6 represents the frequency response chart of the low pass filter with broadband inhibition of another prior art.As shown in Figure 4 and Figure 5, one the 8th capacitor C 8 be couple to a signal input part I1, one the 4th inductance L 4 and connect the 8th capacitor C 8,1 the tenth capacitor C 10 be couple to signal input part I1 and one with reference between the earth terminal GND, one the 9th capacitor C 9 is couple between the 8th capacitor C 8 and the signal output part I2, one the 5th inductance L 5 and connect that the 9th capacitor C 9,1 the 11 capacitor C 11 are couple to the 8th capacitor C 8, the 9th capacitor C 9 and with reference between the earth terminal GND and 1 the 12 capacitor C 12 is couple to signal output part I2 and with reference between the earth terminal GND.If these two LC resonance circuits are vertically repeatedly put, because the influence of the forceful electric power magnetic coupling between the 4th inductance L 4 and the 5th inductance L 5 and spuious item will destroy the resonance characteristics of LC and LC oneself among former the design, the equivalent electric circuit that is to say it has been a framework shown in Figure 4 no longer, certainly it also no longer follows script attenuation characteristic as shown in Figure 6, that is to say; Desirable fp1 and fp2 will not occur in frequency response, and its result will make the degree of difficulty of circuit design heighten; And because two resonators are unit independently, thus nearly twice area when topology layout, will be expended, and then cause the significantly increase of production cost.
Because described prior art has the low pass filter degree of difficulty in design and the restriction of topology layout that the broadband suppresses, facilitate the utility model that a kind of preferable solution is provided, utilize less assembly, and reach the electrical characteristic identical with traditional prior art circuits, more utilize the low temperature co-fired technology of multi-layer ceramics (Multi-layer Low Temperature Co-fired Ceramic, LTCC), make it reach the target of component miniaturization.
The utility model content
In view of this, the utility model main purpose is for providing a kind of low pass filter that the broadband suppresses that has, particularly relevant for utilizing the low temperature co-fired technology of multi-layer ceramics (Multi-layer Low TemperatureCo-fired Ceramic, a kind of multilayer low pass filter LTCC) with broadband inhibition.
For reaching described purpose, the utility model proposes a kind of low pass filter that the broadband suppresses that has, this low pass filter with broadband inhibition is similar to conventional filter, but the inductance central authorities in prior art add a direct-to-ground capacitance, utilize the circuit theory of Δ-Y, by the adjustment of direct-to-ground capacitance size, can obtain the low pass filter of two cut-off frequencies, the low pass filter with broadband inhibition comprises: a signal input part; One signal output part; One first inductance is couple to signal input part; One second inductance is couple between first inductance and the signal output part; One first electric capacity is couple between signal input part and the signal output part; One second electric capacity is couple between a signal input part and the earth terminal; One the 3rd electric capacity is couple between first, second inductance and the earth terminal; And one the 4th electric capacity, be couple between signal output part and the earth terminal.
The utility model also provides a kind of multilayer low pass filter that the broadband suppresses that has, and comprising: a signal input part and a signal output part; One first substrate has one first conductor path layer; One second substrate is arranged under described first substrate, has one second conductor path layer; The starting point of the wherein said second conductor path layer is couple to described signal input part, the terminal point of the described second conductor path layer passes described first substrate and is couple to the starting point of the described first conductor path layer, makes the described first and second conductor path layers form helicoidal structure and as one first inductance; One the 3rd substrate has one first conductor surface layer, is couple to described signal input part; One tetrabasal is arranged under described the 3rd substrate, has one second conductor surface layer and is couple to described signal output part, and described second conductor surface layer and the described first conductor surface layer constitute one first electric capacity; One the 5th substrate has one the 3rd conductor path layer, and the starting point of described the 3rd conductor path layer is couple to the terminal point of the described first conductor path layer; One the 6th substrate is arranged under described the 5th substrate, has one the 4th conductor path layer; Wherein, the terminal point of described the 4th conductor path layer is couple to described signal output part, the starting point of the described second conductor path layer is passed described the 5th substrate and is couple to the terminal point of described the 3rd conductor path layer, makes the described third and fourth conductor path layer form helicoidal structure and as one second inductance; One the 7th substrate has a reference conductor surface layer; And one the 8th substrate, be arranged under described the 7th substrate, have the one the 3rd, the 4th, reach the 5th conductor surface layer, described the 3rd conductor surface layer is couple to described signal input part in order to constitute one second electric capacity with described reference conductor surface layer, described the 4th conductor surface layer is couple to the starting point of the terminal point of the described first conductor path layer and described the 3rd conductor path layer in order to constitute one the 3rd electric capacity with described reference conductor surface layer, and described the 5th conductor surface layer is couple to described signal output part in order to constitute one the 4th electric capacity with described reference conductor surface layer.
In addition, the utility model also utilizes the low temperature co-fired technology of multi-layer ceramics (Multi-layer LowTemperature Co-fired Ceramic, LTCC) will have the low pass filter that the broadband suppresses and create a kind of multilayer low pass filter, utilize less assembly, make it have the advantage of the identical electrical characteristic of conventional lowpass filter, therefore use more simplifying that this circuit will become when the actual track layout, and make the utility model also have splendid economic benefit.
For described purpose of the present utility model, feature and advantage can be become apparent, some preferred embodiments cited below particularly, and cooperate appended accompanying drawing, be described below in detail.
Description of drawings
Fig. 1 represents the circuit diagram of the low pass filter of a prior art.
Fig. 2 represents the structure chart of the low pass filter of a prior art.
Fig. 3 represents the frequency response chart of the low pass filter of a prior art.
Fig. 4 represents the circuit diagram of the low pass filter with broadband inhibition of another prior art.
Fig. 5 represents the structure chart of the low pass filter with broadband inhibition of another prior art.
Fig. 6 represents the frequency response chart of the low pass filter with broadband inhibition of another prior art.
Fig. 7 represents that first embodiment of the present utility model has the circuit diagram of the low pass filter of broadband inhibition.
Fig. 8 represents that first embodiment of the present utility model has the frequency response chart of the low pass filter of broadband inhibition.
Fig. 9 represents that second embodiment of the present utility model has the structure chart of the multilayer low pass filter of broadband inhibition.
[symbol description]
The 10-first conductor path layer, the 20-second conductor path layer, the 30-first conductor surface layer, the 40-second conductor surface layer, 50-the 3rd conductor path layer, 60-the 4th conductor path layer, 70-reference conductor surface layer, 80-the 3rd conductor surface layer, 90-the 4th conductor surface layer, 100-the 5th conductor surface layer, M1-first substrate, M2-second substrate, M3-the 3rd substrate, the M4-tetrabasal, M5-the 5th substrate, M6-the 6th substrate, M7-the 7th substrate, M8-the 8th substrate, L1-first inductance, L2-second inductance, L3-the 3rd inductance, L4-the 4th inductance, L5-the 5th inductance, C1-first electric capacity, C2-second electric capacity, C3-the 3rd electric capacity, C4-the 4th electric capacity, C5-the 5th electric capacity, C6-the 6th electric capacity, C7-the 7th electric capacity, C8-the 8th electric capacity, C9-the 9th electric capacity, C10-the tenth electric capacity, C11-the 11 electric capacity, C12-the 12 electric capacity, the common guide hole of VC-, V1-first guide hole, V2-second guide hole, I1-signal input part, I2-signal output part, fp1-first cut-off frequency, fp2-second cut-off frequency, GND-is with reference to earth terminal.
Embodiment
Embodiment one:
Fig. 7 represents that first embodiment of the present utility model has the circuit diagram of the low pass filter of broadband inhibition; As shown in Figure 7, having the low pass filter that the broadband suppresses comprises: a signal input part I1; One signal output part I2; One first inductance L 1 is couple to signal input part I1; One second inductance L 2 is couple between first inductance L 1 and the signal output part I2; One first capacitor C 1 is couple between signal input part I1 and the signal output part I2; One second capacitor C 2 is couple to signal input part I1 and with reference between the earth terminal GND; One the 3rd capacitor C 3 is couple to first inductance L 1, second inductance L 2 and with reference between the earth terminal GND; And one the 4th capacitor C 4, be couple to signal output part I2 and with reference between the earth terminal GND.
Fig. 8 represents that first embodiment of the present utility model has the frequency response chart of the low pass filter of broadband inhibition; As shown in Figure 8, has the circuit theory that low pass filter that the broadband suppresses utilizes Δ-Y, by adjustment, to obtain the first cut-off frequency fp1 and the second cut-off frequency fp2 to the capacitance size of the 3rd capacitor C 3.
Embodiment two:
Fig. 9 represents that second embodiment of the present utility model has the structure chart of the multilayer low pass filter of broadband inhibition, and as shown in Figure 9, the multilayer low pass filter with broadband inhibition comprises: a signal input part I1; One signal output part I2; One first substrate M1; One second substrate M2; One the 3rd substrate M3; One tetrabasal M4; One the 5th substrate M5; One the 6th substrate M6; One the 7th substrate M7; And one the 8th substrate M8.
The operation principle that present embodiment has a multilayer low pass filter that the broadband suppresses is as described in first embodiment, and its structure with multilayer low pass filter that the broadband suppresses is as follows.The first substrate M1 has one first conductor path layer 10; The second substrate M2 is arranged under the first substrate M1, has one second conductor path layer 20; Wherein, the starting point of the second conductor path layer 20 is couple to signal input part I1, and the first substrate M1 also has one first through hole V1, make the terminal point of the second conductor path layer 20 be couple to the starting point of the first conductor path layer 10, make the first conductor path layer 10 and the second conductor path layer 20 form helicoidal structures and as one first inductance L 1.
The 3rd substrate M3 has one first conductor surface layer 30, be couple to signal input part I1, tetrabasal M4 is arranged under the 3rd substrate M3, has one second conductor surface layer 40 and is couple to signal output part I2, and the second conductor surface layer 40 and the first conductor surface layer 10 constitute one first capacitor C 1; The starting point that the 5th substrate M5 has one the 3rd conductor path layer, 50, the three a conductor path layer 50 is couple to the terminal point of the first conductor path layer 10; The 6th substrate M6 is arranged under the 5th substrate M5, has one the 4th conductor path layer 60, wherein; The terminal point of the 4th conductor path layer 60 is couple to signal output part I2, and the 5th substrate M5 also has one second through hole V2, make the starting point of the 4th conductor path layer 60 be couple to the terminal point of the 3rd conductor path layer 50, make the 3rd conductor path layer 50 and the 4th conductor path layer 60 form helicoidal structures and as one second inductance L 2.
The 7th substrate M7 has a reference conductor surface layer 70 and is couple to one with reference to earth terminal GND, and the 8th substrate M8 be arranged under the 7th substrate M7, has one the 3rd conductor surface layer 80, the 4th conductor surface layer 90, and the 5th conductor surface layer 100, the 3rd conductor surface layer 80 is couple to signal input part I1 in order to constitute one second capacitor C 2 with reference conductor surface layer 70, the 4th conductor surface layer 90 is couple to the starting point of the terminal point of the first conductor path layer 10 and the 3rd conductor path layer 50 in order to constitute one the 3rd capacitor C 3 with reference conductor surface layer 70, the 5th conductor surface layer 100 is couple to signal output part I2 in order to constitute one the 4th capacitor C 4 with reference conductor surface layer 70, wherein; Be arranged on the 8th substrate C8 to the 3rd conductor surface layer 80 to the 5th conductor surface layers 100 mutual electrical isolation.
Wherein, the 3rd substrate M3 is arranged under the second substrate M2, the 5th substrate M5 is arranged under the tetrabasal M4, and the 7th substrate M7 is arranged under the 6th substrate M6, multilayer low pass filter with broadband inhibition also has a common through hole VC and is arranged on the first substrate M1 to the, the seven substrate M7, and the starting point of the terminal point of the 4th conductor surface layer 90, the first conductor path layer 10 and the 3rd conductor path layer 50 can see through the conductor part of common through hole VC institute tool and be couple to together, and conductor part and the reference conductor surface layer 70 mutual electrical isolation of common through hole VC.
By present embodiment as can be known, it is consistent with conventional filter to have the shared configuration area size of multilayer low pass filter that the broadband suppresses, but adds the inhibition zone characteristic that can obtain wideband after common guide hole VC, the first guide hole V1, the second guide hole V2 and the 3rd capacitor C 3.
Though the utility model discloses as above with two preferred embodiments; right its is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; can do and change and retouching, therefore protection range of the present utility model should be looked the scope that accompanying Claim defines and is as the criterion.
Claims (9)
1. one kind has the low pass filter that the broadband suppresses, and comprising:
One signal input part;
One signal output part;
One first electric capacity is couple between described signal input part and the described signal output part;
One second electric capacity is couple to described signal input part and with reference between the earth terminal;
It is characterized in that described low pass filter also comprises:
One first inductance is couple to described signal input part;
One second inductance is couple between described first inductance and the described signal output part;
One the 3rd electric capacity is couple to described first, second inductance and described with reference between the earth terminal;
And
One the 4th electric capacity is couple to described signal output part and described with reference between the earth terminal.
2. one kind has the multilayer low pass filter that the broadband suppresses, and comprising:
One signal input part and a signal output part;
It is characterized in that described low pass filter also comprises:
One first substrate has one first conductor path layer;
One second substrate is arranged under described first substrate, has one second conductor path layer; The starting point of the wherein said second conductor path layer is couple to described signal input part, the terminal point of the described second conductor path layer passes described first substrate and is couple to the starting point of the described first conductor path layer, makes the described first and second conductor path layers form helicoidal structure and as one first inductance;
One the 3rd substrate has one first conductor surface layer, is couple to described signal input part;
One tetrabasal is arranged under described the 3rd substrate, has one second conductor surface layer and is couple to described signal output part, and described second conductor surface layer and the described first conductor surface layer constitute one first electric capacity;
One the 5th substrate has one the 3rd conductor path layer, and the starting point of described the 3rd conductor path layer is couple to the terminal point of the described first conductor path layer;
One the 6th substrate is arranged under described the 5th substrate, has one the 4th conductor path layer; Wherein, the terminal point of described the 4th conductor path layer is couple to described signal output part, the starting point of the described second conductor path layer is passed described the 5th substrate and is couple to the terminal point of described the 3rd conductor path layer, makes the described third and fourth conductor path layer form helicoidal structure and as one second inductance;
One the 7th substrate has a reference conductor surface layer; And
One the 8th substrate, be arranged under described the 7th substrate, have the one the 3rd, the 4th, reach the 5th conductor surface layer, described the 3rd conductor surface layer is couple to described signal input part in order to constitute one second electric capacity with described reference conductor surface layer, described the 4th conductor surface layer is couple to the starting point of the terminal point of the described first conductor path layer and described the 3rd conductor path layer in order to constitute one the 3rd electric capacity with described reference conductor surface layer, and described the 5th conductor surface layer is couple to described signal output part in order to constitute one the 4th electric capacity with described reference conductor surface layer.
3. the multilayer low pass filter with broadband inhibition as claimed in claim 2, wherein, described the 3rd substrate is arranged under described second substrate; Described the 5th substrate is arranged under the described tetrabasal; Described the 7th substrate is arranged under described the 6th substrate.
4. the multilayer low pass filter with broadband inhibition as claimed in claim 3 also has a common through hole and is arranged on described first to the 7th substrate; The terminal point of described the 4th conductor surface layer, the described first conductor path layer and the starting point of described the 3rd conductor path layer see through the conductor part of described common through hole institute tool and are couple to together.
5. the multilayer low pass filter with broadband inhibition as claimed in claim 4, wherein, the conductor part of described common through hole and the mutual electrical isolation of described reference conductor surface layer.
6. as claimed in claim 2 have a multilayer low pass filter that the broadband suppresses, and wherein, described first substrate has one first through hole, makes the terminal point of the described second conductor path layer be couple to the starting point of the described first conductor path layer.
7. as claimed in claim 2 have a multilayer low pass filter that the broadband suppresses, and wherein, described the 5th substrate has one second through hole, makes the starting point of described the 4th conductor path layer be couple to the terminal point of described the 3rd conductor path layer.
8. the multilayer low pass filter with broadband inhibition as claimed in claim 2 also comprise one with reference to earth terminal, and described reference conductor surface layer is couple to described with reference to earth terminal.
9. the multilayer low pass filter with broadband inhibition as claimed in claim 2 wherein, is arranged on described the 8th substrate to the mutual electrical isolation of described the 3rd to the 5th conductor surface layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420001815 CN2737067Y (en) | 2004-01-06 | 2004-01-06 | Low pass filter and multi-layer low pass filter with broadband suppression |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420001815 CN2737067Y (en) | 2004-01-06 | 2004-01-06 | Low pass filter and multi-layer low pass filter with broadband suppression |
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| Publication Number | Publication Date |
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| CN2737067Y true CN2737067Y (en) | 2005-10-26 |
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| CN 200420001815 Expired - Fee Related CN2737067Y (en) | 2004-01-06 | 2004-01-06 | Low pass filter and multi-layer low pass filter with broadband suppression |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101436849B (en) * | 2007-11-12 | 2011-08-24 | 鸿富锦精密工业（深圳）有限公司 | Low-pass filter |
| CN103986435A (en) * | 2014-04-14 | 2014-08-13 | 中国电子科技集团公司第五十五研究所 | Miniaturized wide-stop-band restraint LTCC low-pass filter |
| CN104579220A (en) * | 2015-02-03 | 2015-04-29 | 深圳市麦捷微电子科技股份有限公司 | Multilayer ceramic dielectric sheet type low-pass filter |
| CN108063607A (en) * | 2017-12-11 | 2018-05-22 | 北京北广科技股份有限公司 | A kind of micro high-power ceramic substrate wave filter |
| CN108400776A (en) * | 2017-02-08 | 2018-08-14 | 太阳诱电株式会社 | filter circuit, multiplexer and module |
| CN111244594A (en) * | 2020-01-17 | 2020-06-05 | 中山大学 | LTCC technology-based design method for broadband harmonic suppression low-pass miniature filter |
-
2004
- 2004-01-06 CN CN 200420001815 patent/CN2737067Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101436849B (en) * | 2007-11-12 | 2011-08-24 | 鸿富锦精密工业（深圳）有限公司 | Low-pass filter |
| CN103986435A (en) * | 2014-04-14 | 2014-08-13 | 中国电子科技集团公司第五十五研究所 | Miniaturized wide-stop-band restraint LTCC low-pass filter |
| CN103986435B (en) * | 2014-04-14 | 2017-02-22 | 中国电子科技集团公司第五十五研究所 | Miniaturized wide-stop-band restraint LTCC low-pass filter |
| CN104579220A (en) * | 2015-02-03 | 2015-04-29 | 深圳市麦捷微电子科技股份有限公司 | Multilayer ceramic dielectric sheet type low-pass filter |
| CN104579220B (en) * | 2015-02-03 | 2017-12-05 | 深圳市麦捷微电子科技股份有限公司 | Multiple layer ceramic dielectric chip low pass filter |
| CN108400776A (en) * | 2017-02-08 | 2018-08-14 | 太阳诱电株式会社 | filter circuit, multiplexer and module |
| CN108063607A (en) * | 2017-12-11 | 2018-05-22 | 北京北广科技股份有限公司 | A kind of micro high-power ceramic substrate wave filter |
| CN111244594A (en) * | 2020-01-17 | 2020-06-05 | 中山大学 | LTCC technology-based design method for broadband harmonic suppression low-pass miniature filter |
| CN111244594B (en) * | 2020-01-17 | 2022-04-26 | 中山大学 | LTCC technology-based design method for broadband harmonic suppression low-pass miniature filter |
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Granted publication date: 20051026 |