CN101609914A - A kind of LTCC band-pass filter with harmonic suppression - Google Patents
A kind of LTCC band-pass filter with harmonic suppression Download PDFInfo
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- CN101609914A CN101609914A CNA2009100593504A CN200910059350A CN101609914A CN 101609914 A CN101609914 A CN 101609914A CN A2009100593504 A CNA2009100593504 A CN A2009100593504A CN 200910059350 A CN200910059350 A CN 200910059350A CN 101609914 A CN101609914 A CN 101609914A
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- conductor layer
- pass filter
- ltcc
- band
- rectangular metal
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Abstract
A kind of LTCC band-pass filter with harmonic suppression belongs to electronic technology field, relates to band-pass filter with harmonic suppression.Described band-pass filter with harmonic suppression is the two-stage bandpass filter with 1 transmission zero, adopt the distortion Chebyshev filter prototype of controllable transmission zero points, and realize equivalent lumped-parameter element by the LTCC sandwich construction, realizing can greatly reducing the band pass filter volume under the equivalent technology index situation; Simultaneously, this band pass filter is using under the bipolar resonance situation, can increase the outer harmonic suppression effect of band effectively, thereby take into account the requirement of the insertion loss of band pass filter to passband and stopband better.In addition, this band pass filter also have cost low, help producing in batches, the unexistent advantage of conventional band-pass filters such as good high frequency performance, temperature performance.The present invention can be widely used in the wireless radiofrequency communication system.
Description
Technical field
The invention belongs to electronic technology field, it relates to a kind of band pass filter, and is specifically related to a kind of miniaturization LTCC (LTCC) band-pass filter with harmonic suppression.
Background technology
The microwave and millimeter wave band pass filter is a critical component of microwave and millimeter wave radio system, particularly in the microwave and millimeter wave integrated circuit, radio-frequency front-end needs not only that the insertion loss of band pass filter is little, selectivity good, and requires the volume of band pass filter as much as possible little.And traditional band pass filter often volume is all bigger, can not satisfy the requirement of radio-frequency front-end to device miniaturization.In addition: the insertion loss of band pass filter is different to the requirement of passband and stopband: the smaller the better at logical in-band insertion loss, so that most energy can pass through network; Be the bigger the better and in stopband, insert decay, so that can suppress to disturb or other does not wish the frequency seen in terminal.But for general band pass filter, if when suppressing the harmonic frequency of stronger clutter frequency of the nearer signal of distance center frequency or inhibition, it is not enough that the decay in the stopband has just seemed.
Summary of the invention
The invention provides a kind of band-pass filter with harmonic suppression based on the LTCC technology, this band pass filter adopts the distortion Chebyshev filter prototype of controllable transmission zero points, and realize equivalent lumped-parameter element by the LTCC sandwich construction, realizing can greatly reducing the band pass filter volume under the equivalent technology index situation; Simultaneously, this band pass filter is using under the bipolar resonance situation, can increase the outer harmonic suppression effect of band effectively, thereby take into account the requirement of the insertion loss of band pass filter to passband and stopband better.In addition, this band pass filter also have cost low, help producing in batches, the unexistent advantage of conventional band-pass filters such as good high frequency performance, temperature performance.
Technical solution of the present invention is:
A kind of LTCC band-pass filter with harmonic suppression, as shown in Figure 1, for having the two-stage bandpass filter of 1 transmission zero, its equivalent electric circuit is a symmetrical circuit structure: the signal input part of band pass filter connects first capacitor C
1Input, first capacitor C
1Output by coupling capacitance C
IConnect second capacitor C
2Input, second capacitor C
2The signal output part of output tape splicing bandpass filter; In first capacitor C
1Output and coupling capacitance C
IBetween tie point and ground between have the first parallel resonance unit, in second capacitor C
2Input and coupling capacitance C
IBetween tie point and ground between have the second parallel resonance unit; The described first parallel resonance unit is by the first resonant capacitance C
R1With the first resonant inductance L
R1Be formed in parallel, an end ground connection, the other end is by the first series capacitance C
Z1With first capacitor C
1Output link to each other; The described second parallel resonance unit is by the second resonant capacitance C
R2With the second resonant inductance L
R2Be formed in parallel, an end ground connection, the other end is by the second series capacitance C
Z2With second capacitor C
2Input link to each other.
Whole band-pass filter with harmonic suppression is the LTCC sandwich construction, and as shown in Figure 2, be made of three layers of medium substrate and four layers of conductor layer: first conductor layer is positioned at the first medium substrate upper surface; Second conductor layer is between first and second medium substrate; The 3rd conductor layer is between second and third medium substrate; The 4th conductor layer is positioned at the 3rd medium substrate lower surface; Described three layers of medium substrate are LTCC ceramic dielectric substrate, described first conductor layer adopts the LTCC typography to be printed on a LTCC ceramic dielectric upper surface of base plate, described second conductor layer adopts the LTCC typography to be printed on the 2nd LTCC ceramic dielectric upper surface of base plate, described the 3rd conductor layer adopts the LTCC typography to be printed on the 3rd LTCC ceramic dielectric upper surface of base plate, and described the 4th conductor layer adopts the LTCC typography to be printed on the 3rd LTCC ceramic dielectric base lower surface.
Described first conductor layer is two first identical rectangular metal films, each first rectangular metal film has a strip metal microstrip line respectively and is attached thereto, two strip metal microstrip lines link to each other with signal output part with the signal input part of entire belt bandpass filter respectively, and two first rectangular metal films are close mutually but continuous each other; Described second conductor layer is two second identical rectangular metal films, the position of the second rectangular metal film is corresponding with first metal film, between two second rectangular metal films mutually the close limit metal film that has interdigital structure separately be attached thereto, the metal film of two interdigital structures mutually near but do not link to each other each other; Described the 3rd conductor layer is two the 3rd identical rectangular metal films, and each the 3rd rectangular metal film has a strip metal microstrip line respectively and is attached thereto, and two the 3rd rectangular metal films are close mutually but continuous each other; Described the 4th conductor layer is the metal floor layer that all covers the 3rd medium substrate lower surface; The termination of the two strip metal microstrip lines that link to each other respectively with two the 3rd rectangular metal films in described the 3rd conductor layer links to each other with the metal floor layer by the through hole of the 3rd medium substrate corresponding position.
First rectangular metal film of first conductor layer and the second rectangular metal film of second conductor layer and the dielectric layer between the two constitute first capacitor C in the equivalent electric circuit jointly
1With second capacitor C
2The metal film of two interdigital structures of second conductor layer constitutes the coupling capacitance C in the equivalent electric circuit jointly
ISecond rectangular metal film of second conductor layer and the 3rd rectangular metal film of the 3rd conductor layer and the dielectric layer between the two constitute the first series capacitance C in the equivalent electric circuit jointly
Z1With the second series capacitance C
Z2The 3rd rectangular metal film of the 3rd conductor layer and metal floor layer and between dielectric layer constitute the first resonant capacitance C in the equivalent electric circuit jointly
R1With the second resonant capacitance C
R2, the metal micro-strip line that links to each other respectively with two the 3rd rectangular metal films in the 3rd conductor layer constitutes the first resonant inductance L in the equivalent electric circuit
R1With the second resonant inductance L
R2
The invention has the beneficial effects as follows:
The present invention realizes equivalent lumped-parameter element by the LTCC sandwich construction, is realizing can greatly reducing the band pass filter volume under the equivalent technology index situation; Simultaneously, this band pass filter is using under the bipolar resonance situation, can increase the outer harmonic suppression effect of band effectively, thereby take into account the requirement of the insertion loss of band pass filter to passband and stopband better.Band pass filter provided by the invention has that volume is little, function admirable, compact conformation, can be processed as surface mount elements and be easy to integrated advantage.In addition, this band pass filter has the low advantage of the cost of batch process in batches based on LTCC technology.
Description of drawings
Fig. 1 is the equivalent circuit diagram of LTCC band-pass filter with harmonic suppression of the present invention.
Fig. 2 is the structural representation of LTCC band-pass filter with harmonic suppression of the present invention.
Fig. 3 is the end view of the described LTCC band-pass filter with harmonic suppression of the specific embodiment of the invention.
Fig. 4 is the test result of the described LTCC band-pass filter with harmonic suppression of the specific embodiment of the invention.
Embodiment
As shown in Figure 1, 2, the structure and the equivalent electric circuit thereof of the LTCC band-pass filter with harmonic suppression of the specific embodiment of the invention have a detailed description in summary of the invention, do not repeat them here, and be only as follows to each several part details parametric description:
As shown in Figure 3: first and second layer dielectric substrate thickness is 0.1mm, and the 3rd layer of dielectric substrate thickness is 0.2mm, and the 4th conductor layer thickness is 0.017mm; The metal that conductor layer all adopts is a gold; The medium substrate material is a Ferro A6M type LTCC ceramic material, and its relative dielectric constant Er is 6.3, and dielectric loss angle tangent tan is 0.001, and conductivity is 3 * 10
9S/m; The entire device volume only is 3.5mm * 4mm * 0.6mm.
Test result as shown in Figure 4, this band pass filter works in the 2.8-3.2G hertz, there is 1 transmission zero lower sideband harmonic wave position, Insertion Loss is less than 1.2dB in the passband, return loss is greater than 16dB in the passband.Owing to produced a transmission zero in lower sideband harmonic wave position, made lower sideband very precipitous, thereby strengthened selectivity, and under the situation of only using bipolar resonance, increased attenuation outside a channel and harmonic suppression effect effectively to frequency.
To sum up, band pass filter provided by the invention has that volume is little, function admirable, compact conformation, can be processed as surface mount elements and be easy to integrated advantage.In addition, this band pass filter has the low advantage of the cost of batch process in batches based on LTCC technology.This band pass filter can be widely used in the wireless radiofrequency communication system.
Claims (1)
1, a kind of LTCC band-pass filter with harmonic suppression, for having the two-stage bandpass filter of 1 transmission zero, its equivalent electric circuit is a symmetrical circuit structure: the signal input part of band pass filter connects first capacitor C
1Input, first capacitor C
1Output by coupling capacitance C
IConnect second capacitor C
2Input, second capacitor C
2The signal output part of output tape splicing bandpass filter; In first capacitor C
1Output and coupling capacitance C
IBetween tie point and ground between have the first parallel resonance unit, in second capacitor C
2Input and coupling capacitance C
IBetween tie point and ground between have the second parallel resonance unit; The described first parallel resonance unit is by the first resonant capacitance C
R1With the first resonant inductance L
R1Be formed in parallel, an end ground connection, the other end is by the first series capacitance C
Z1With first capacitor C
1Output link to each other; The described second parallel resonance unit is by the second resonant capacitance C
R2With the second resonant inductance L
R2Be formed in parallel, an end ground connection, the other end is by the second series capacitance C
Z2With second capacitor C
2Input link to each other;
It is characterized in that:
Whole band-pass filter with harmonic suppression is the LTCC sandwich construction, and be made of three layers of medium substrate and four layers of conductor layer: first conductor layer is positioned at the first medium substrate upper surface; Second conductor layer is between first and second medium substrate; The 3rd conductor layer is between second and third medium substrate; The 4th conductor layer is positioned at the 3rd medium substrate lower surface; Described three layers of medium substrate are LTCC ceramic dielectric substrate, described first conductor layer adopts the LTCC typography to be printed on a LTCC ceramic dielectric upper surface of base plate, described second conductor layer adopts the LTCC typography to be printed on the 2nd LTCC ceramic dielectric upper surface of base plate, described the 3rd conductor layer adopts the LTCC typography to be printed on the 3rd LTCC ceramic dielectric upper surface of base plate, and described the 4th conductor layer adopts the LTCC typography to be printed on the 3rd LTCC ceramic dielectric base lower surface;
Described first conductor layer is two first identical rectangular metal films, each first rectangular metal film has a strip metal microstrip line respectively and is attached thereto, two strip metal microstrip lines link to each other with signal output part with the signal input part of entire belt bandpass filter respectively, and two first rectangular metal films are close mutually but continuous each other; Described second conductor layer is two second identical rectangular metal films, the position of the second rectangular metal film is corresponding with first metal film, between two second rectangular metal films mutually the close limit metal film that has interdigital structure separately be attached thereto, the metal film of two interdigital structures mutually near but do not link to each other each other; Described the 3rd conductor layer is two the 3rd identical rectangular metal films, and each the 3rd rectangular metal film has a strip metal microstrip line respectively and is attached thereto, and two the 3rd rectangular metal films are close mutually but continuous each other; Described the 4th conductor layer is the metal floor layer that all covers the 3rd medium substrate lower surface; The termination of the two strip metal microstrip lines that link to each other respectively with two the 3rd rectangular metal films in described the 3rd conductor layer links to each other with the metal floor layer by the through hole of the 3rd medium substrate corresponding position;
First rectangular metal film of first conductor layer and the second rectangular metal film of second conductor layer and the dielectric layer between the two constitute first capacitor C in the equivalent electric circuit jointly
1With second capacitor C
2The metal film of two interdigital structures of second conductor layer constitutes the coupling capacitance C in the equivalent electric circuit jointly
ISecond rectangular metal film of second conductor layer and the 3rd rectangular metal film of the 3rd conductor layer and the dielectric layer between the two constitute the first series capacitance C in the equivalent electric circuit jointly
Z1With the second series capacitance C
Z2The 3rd rectangular metal film of the 3rd conductor layer and metal floor layer and between dielectric layer constitute the first resonant capacitance C in the equivalent electric circuit jointly
R1With the second resonant capacitance C
R2, the metal micro-strip line that links to each other respectively with two the 3rd rectangular metal films in the 3rd conductor layer constitutes the first resonant inductance L in the equivalent electric circuit
R1With the second resonant inductance L
R2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100593504A CN101609914A (en) | 2009-05-20 | 2009-05-20 | A kind of LTCC band-pass filter with harmonic suppression |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100593504A CN101609914A (en) | 2009-05-20 | 2009-05-20 | A kind of LTCC band-pass filter with harmonic suppression |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103187603A (en) * | 2013-03-25 | 2013-07-03 | 华南理工大学 | Wide-stopband LTCC (low temperature co-fired ceramic) band-pass filter based on magnetoelectric coupling counteraction technology |
| CN103281046A (en) * | 2013-01-30 | 2013-09-04 | 王少夫 | Implementation method for band-pass filter with double out-of-band transmission zeros |
| CN103943922A (en) * | 2014-04-30 | 2014-07-23 | 南通大学 | Harmonic suppression band-pass filter and manufacturing method thereof |
| CN104183892A (en) * | 2014-08-19 | 2014-12-03 | 南京理工大学 | Microwave filter of strip-line resonant cavity structure |
| CN108011605A (en) * | 2017-12-06 | 2018-05-08 | 深圳振华富电子有限公司 | One kind miniaturization is high to suppress LTCC bandpass filters |
| CN108183295A (en) * | 2017-12-26 | 2018-06-19 | 上海交通大学 | Double-passband filter based on commensurability transmission circuit network |
| 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 |
| CN110235302A (en) * | 2017-02-04 | 2019-09-13 | Cts公司 | Radio-frequency filter with individual capacitor and Inductor substrate |
| CN112611721A (en) * | 2020-12-09 | 2021-04-06 | 北京邮电大学 | Broadband terahertz chiral discrimination device and circularly polarized wave selector |
| CN113314816A (en) * | 2021-05-31 | 2021-08-27 | 电子科技大学 | Composite dielectric millimeter wave filter based on multilayer technology |
-
2009
- 2009-05-20 CN CNA2009100593504A patent/CN101609914A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103281046A (en) * | 2013-01-30 | 2013-09-04 | 王少夫 | Implementation method for band-pass filter with double out-of-band transmission zeros |
| CN103187603B (en) * | 2013-03-25 | 2015-11-11 | 华南理工大学 | A kind of Wide stop bands LTCC band pass filter based on magneto-electric coupled cancellation technology |
| CN103187603A (en) * | 2013-03-25 | 2013-07-03 | 华南理工大学 | Wide-stopband LTCC (low temperature co-fired ceramic) band-pass filter based on magnetoelectric coupling counteraction technology |
| CN103943922A (en) * | 2014-04-30 | 2014-07-23 | 南通大学 | Harmonic suppression band-pass filter and manufacturing method thereof |
| CN103943922B (en) * | 2014-04-30 | 2016-08-24 | 南通大学 | Band-pass filter with harmonic suppression and manufacture method |
| CN104183892A (en) * | 2014-08-19 | 2014-12-03 | 南京理工大学 | Microwave filter of strip-line resonant cavity structure |
| CN110235302A (en) * | 2017-02-04 | 2019-09-13 | Cts公司 | Radio-frequency filter with individual capacitor and Inductor substrate |
| CN110235302B (en) * | 2017-02-04 | 2021-10-19 | Cts公司 | Radio frequency filter with separate capacitive and inductive substrates |
| CN108011605A (en) * | 2017-12-06 | 2018-05-08 | 深圳振华富电子有限公司 | One kind miniaturization is high to suppress LTCC bandpass filters |
| CN108183295B (en) * | 2017-12-26 | 2019-05-28 | 上海交通大学 | Double-passband filter based on commensurability transmission circuit network |
| CN108183295A (en) * | 2017-12-26 | 2018-06-19 | 上海交通大学 | Double-passband filter based on commensurability transmission circuit network |
| 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 |
| CN112611721A (en) * | 2020-12-09 | 2021-04-06 | 北京邮电大学 | Broadband terahertz chiral discrimination device and circularly polarized wave selector |
| CN112611721B (en) * | 2020-12-09 | 2022-05-13 | 北京邮电大学 | Broadband terahertz chiral discrimination device and circularly polarized wave selector |
| CN113314816A (en) * | 2021-05-31 | 2021-08-27 | 电子科技大学 | Composite dielectric millimeter wave filter based on multilayer technology |
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Application publication date: 20091223 |