CN210576354U - LTCC band-pass filter - Google Patents
LTCC band-pass filter Download PDFInfo
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- CN210576354U CN210576354U CN201921927573.3U CN201921927573U CN210576354U CN 210576354 U CN210576354 U CN 210576354U CN 201921927573 U CN201921927573 U CN 201921927573U CN 210576354 U CN210576354 U CN 210576354U
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Abstract
The utility model discloses a LTCC band pass filter, including the metallic shield shell, metallic shield shell one end is equipped with port input coupling line, the metallic shield shell other end is equipped with port output coupling line, it has multilayer ceramic medium to link between port input coupling line and the port output coupling line, it has first syntonizer to coat on the multilayer ceramic medium, the second syntonizer, the third syntonizer, fourth syntonizer and oval function zero point coupling piece, some signals are through port input coupling line, first syntonizer, the second syntonizer, the third syntonizer, fourth syntonizer and port output coupling line, another part signal is through port input coupling line, first syntonizer, oval function zero point coupling piece, fourth syntonizer and port output coupling line. The utility model discloses the wave filter not only can solve the bulky problem of wave filter, adopts the design of elliptic function simultaneously, can reach the higher outband rejection requirement outside the passband, improves signal processing quality and wireless transmission signal.
Description
Technical Field
The utility model relates to a wave filter field, concretely relates to LTCC band pass filter.
Background
Various band-pass filters exist in the current market, but the conventional filters generally have the problems of large size, poor sealing performance, poor reliability and the like, and because the general filters are large in size and far in suppression frequency, the near-end suppression requirement cannot be met, and the frequency response characteristic is low. Some filters adopting a low temperature co-fired ceramic (LTCC) technology process are also available in the market, but most product designs are designed according to an LC principle, so that the design difficulty is high, the one-time success rate of production is low, the cost investment is high, the process requirement is high, and the cost is high due to the adoption of a foreign green tape design.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that current filter ubiquitous is bulky, sealing performance is poor, the poor scheduling problem of reliability, simultaneously because general filter is bulky, the rejection frequency is far away, can not realize the rejection requirement of near-end, frequency response characteristic is low, aim at provides a LTCC band pass filter, not only can solve the bulky problem of filter, adopt the design of elliptic function simultaneously, can reach the higher outband rejection requirement outside the passband, improve signal processing quality and wireless transmission signal.
The utility model discloses a following technical scheme realizes:
the utility model relates to a LTCC band pass filter, including the metallic shield shell, the one end of metallic shield shell is equipped with port input coupling line, the other end of metallic shield shell is equipped with port output coupling line, it has multilayer ceramic medium to link between port input coupling line and the port output coupling line, it has first syntonizer to coat on the multilayer ceramic medium, the second syntonizer, the third syntonizer, fourth syntonizer and oval function zero point coupling piece, one of them part signal is in proper order through port input coupling line, first syntonizer, the second syntonizer, the third syntonizer, fourth syntonizer and port output coupling line, another part signal is in proper order through port input coupling line, first syntonizer, oval function zero point coupling piece and fourth syntonizer and port output coupling line.
The first resonator, the second resonator, the third resonator and the fourth resonator are all composed of a resonance microstrip line and a loading microstrip line to form a complete frequency resonator, the frequency can be adjusted according to index requirements, the required frequency is designed to resonate, and the port input coupling line and the first resonator, and the fourth resonator and the port output coupling line are connected through the microstrip lines.
The utility model discloses a wave filter not only can solve the bulky problem of wave filter, adopts the design of elliptic function simultaneously, can reach the higher outband rejection requirement outside the passband, improves signal processing quality and wireless transmission signal. The utility model discloses a signal principle is: the signal is input through a port input coupling line, then input to a first resonator through a port input coupling line microstrip line, the signal is coupled to a second resonator through a gap between a resonance microstrip line and a loading microstrip line, then coupled to a third resonator through a gap, and then coupled to a fourth resonator through a gap, and the fourth resonator is output through a microstrip line to a port output coupling line; and a small part of signals of the first resonator are transmitted to the fourth resonator through the elliptic function zero point coupling block, so that symmetrical elliptic function zero points are formed for absorption, and the requirement of higher out-of-band rejection outside a pass band is met. The metal shielding shell shields the whole external signal, reduces the influence of the external signal on the signal of the product filter, and therefore achieves the high low-noise requirement. The utility model adopts the microstrip design technology to be integrated into the LTCC multilayer thin film circuit to form microstrip flat circuit coupling, which not only can realize the requirement of small insertion loss, but also can greatly reduce the volume of the product, thereby giving up more space on the whole machine and greatly reducing the weight and the cost; the device is combined with the elliptic function zero point coupling block, thereby not only realizing the transmission function of broadband frequency, but also meeting the requirement of near-end inhibition, further ensuring that wireless communication signals are not interfered, and improving the signal processing quality and the wireless transmission signals.
The multilayer ceramic medium is formed by sintering 46 green ceramic chips with the thickness of 35 mu m, the green ceramic chips are made of YF-LFCGS-183 materials with the dielectric constant of 18.3, and the domestic green ceramic chips are adopted to replace imported green ceramic chips, so that the cost is reduced.
The first resonator, the second resonator, the third resonator and the fourth resonator are all located on the 23 rd layer of green ceramic chips, and the elliptic function zero point coupling block is located on the 25 th layer of green ceramic chips.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. the utility model relates to an LTCC band-pass filter, which not only can solve the problem of large filter volume, but also can reach the higher out-of-band rejection requirement outside the pass band by adopting the design of elliptic function, thereby improving the signal processing quality and wireless transmission signals;
2. the utility model relates to an LTCC band-pass filter, adopt the microstrip design technique to integrate into LTCC multilayer film circuit and form the microstrip panel circuit coupling, not only can realize the requirement that the insertion loss is little, can make the volume of product reduce greatly simultaneously to vacate more spaces and weight and cost reduce greatly on the complete machine;
3. the utility model relates to a LTCC band pass filter, microstrip design technique and elliptic function zero point coupling piece combine, have both realized the transmission function of broadband frequency, can satisfy the requirement that the near-end restraines again.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of the present invention.
Reference numbers and corresponding part names in the drawings:
the resonator comprises a 1-port input coupling line, a 2-first resonator, a 3-second resonator, a 4-third resonator, a 5-fourth resonator, a 6-elliptic function zero point coupling block, a 7-port output coupling line and an 8-metal shielding shell.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1
As shown in FIG. 1, the LTCC band pass filter of the present invention comprises a metal shielding case 8, a port input coupling line 1 is disposed at one end of the metal shielding case 8, a port output coupling line 7 is disposed at the other end of the metal shielding case 8, a multilayer ceramic medium is connected between the port input coupling line 1 and the port output coupling line 7, it is characterized in that a first resonator 2, a second resonator 3, a third resonator 4, a fourth resonator 5 and an elliptic function zero point coupling block 6 are coated on the multilayer ceramic medium, one part of signals sequentially pass through the port input coupling line 1, the first resonator 2, the second resonator 3, the third resonator 4, the fourth resonator 5 and the port output coupling line 7, and the other part of signals sequentially pass through the port input coupling line 1, the first resonator 2, the elliptic function zero point coupling block 6, the fourth resonator 5 and the port output coupling line 7.
The utility model discloses a wave filter not only can solve the bulky problem of wave filter, adopts the design of elliptic function simultaneously, can reach the higher outband rejection requirement outside the passband, improves signal processing quality and wireless transmission signal. The utility model discloses a signal principle is: the signal is input through a port input coupling line, then input to a first resonator through a port input coupling line microstrip line, the signal is coupled to a second resonator through a gap between a resonance microstrip line and a loading microstrip line, then coupled to a third resonator through a gap, and then coupled to a fourth resonator through a gap, and the fourth resonator is output through a microstrip line to a port output coupling line; and a small part of signals of the first resonator are transmitted to the fourth resonator through the elliptic function zero point coupling block, so that symmetrical elliptic function zero points are formed for absorption, and the requirement of higher out-of-band rejection outside a pass band is met. The metal shielding shell shields the whole external signal, reduces the influence of the external signal on the signal of the product filter, and therefore achieves the high low-noise requirement. The utility model adopts the microstrip design technology to be integrated into the LTCC multilayer thin film circuit to form microstrip flat circuit coupling, which not only can realize the requirement of small insertion loss, but also can greatly reduce the volume of the product, thereby giving up more space on the whole machine and greatly reducing the weight and the cost; the device is combined with the elliptic function zero point coupling block, thereby not only realizing the transmission function of broadband frequency, but also meeting the requirement of near-end inhibition, further ensuring that wireless communication signals are not interfered, and improving the signal processing quality and the wireless transmission signals.
Preferably, the multilayer ceramic medium is formed by sintering 46 green ceramic chips with the thickness of 35 mu m, the green ceramic chips are made of YF-LFCGS-183 materials with the dielectric constant of 18.3, and the domestic green ceramic chips are adopted to replace imported green ceramic chips, so that the cost is reduced.
Preferably, the first resonator, the second resonator, the third resonator and the fourth resonator are all located on the 23 rd layer green ceramic chip, and the elliptic function zero point coupling block is located on the 25 th layer green ceramic chip.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The utility model provides a LTCC band pass filter, including metallic shield shell (8), the one end of metallic shield shell (8) is equipped with port input coupling line (1), the other end of metallic shield shell (8) is equipped with port output coupling line (7), it has multilayer ceramic medium to link between port input coupling line (1) and port output coupling line (7), a serial communication port, it has first syntonizer (2) to coat on the multilayer ceramic medium, second syntonizer (3), third syntonizer (4), fourth syntonizer (5) and elliptic function zero point coupling piece (6), wherein some signals pass through port input coupling line (1) in proper order, first syntonizer (2), second syntonizer (3), third syntonizer (4), fourth syntonizer (5) and port output coupling line (7), another part signal passes through port input coupling line (1) in proper order, The resonator comprises a first resonator (2), an elliptic function zero point coupling block (6), a fourth resonator (5) and a port output coupling line (7).
2. An LTCC band-pass filter according to claim 1, characterized in that the first (2), second (3), third (4) and fourth (5) resonators are each composed of resonant and loaded microstrip lines.
3. The LTCC bandpass filter of claim 1 wherein the multilayer ceramic dielectric is sintered from 46 layer thick 35 μm green ceramic tiles of YF-LFCGS-183 having a dielectric constant of 18.3.
4. An LTCC band-pass filter according to claim 3, characterized in that the first resonator (2), the second resonator (3), the third resonator (4) and the fourth resonator (5) are all located on the green ceramic sheet of layer 23, and the elliptic function zero point coupling block (6) is located on the green ceramic sheet of layer 25.
5. An LTCC band-pass filter according to claim 1, characterized in that the port input coupling line (1) and the first resonator (2) and the fourth resonator (5) and the port output coupling line (7) are connected by microstrip lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921927573.3U CN210576354U (en) | 2019-11-08 | 2019-11-08 | LTCC band-pass filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921927573.3U CN210576354U (en) | 2019-11-08 | 2019-11-08 | LTCC band-pass filter |
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| CN210576354U true CN210576354U (en) | 2020-05-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116780136A (en) * | 2023-07-19 | 2023-09-19 | 泓林微电子（昆山）有限公司 | Coupling strength tunable film filter based on gold wire bonding technology |
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2019
- 2019-11-08 CN CN201921927573.3U patent/CN210576354U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116780136A (en) * | 2023-07-19 | 2023-09-19 | 泓林微电子（昆山）有限公司 | Coupling strength tunable film filter based on gold wire bonding technology |
| CN116780136B (en) * | 2023-07-19 | 2024-02-27 | 泓林微电子（昆山）有限公司 | Coupling strength tunable film filter based on gold wire bonding technology |
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