CN203326078U - Resonant cavity applied to coaxial resonant duplexer and coaxial resonant duplexer - Google Patents
Resonant cavity applied to coaxial resonant duplexer and coaxial resonant duplexer Download PDFInfo
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- CN203326078U CN203326078U CN2013203283709U CN201320328370U CN203326078U CN 203326078 U CN203326078 U CN 203326078U CN 2013203283709 U CN2013203283709 U CN 2013203283709U CN 201320328370 U CN201320328370 U CN 201320328370U CN 203326078 U CN203326078 U CN 203326078U
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Abstract
The utility model provides a resonant cavity applied to a coaxial resonant duplexer and the coaxial resonant duplexer. The height and the width of the resonant cavity are 30 mm. The length is 15 mm to 30 mm. The height of an outer guide column in the cavity is 29 mm. The outer diameter is 10 mm, and the inner diameter is 8 mm. The diameter of an inner guide column which is arranged in the outer guide column is 4 mm to 6 mm. The coaxial resonant duplexer comprises the resonant cavity. The coaxial resonant duplexer which uses the resonant cavity has the advantages of low insertion loss in a band, high pass band steepness and high Q value.
Description
Technical field
The utility model relates to communication technical field, particularly relates to a kind of resonant cavity for coaxial resonance duplexer and coaxial resonance duplexer.
Background technology
The develop rapidly of wireless communication technique and continuous maturation make Mobile Communication Service more convenient effectively.
Antenna for base station, as realizing one of nucleus equipment that mobile communications network covers, is the important component part of mobile communication system.The progress that antenna for base station has been accompanied by Mobile Communication Industry has realized development fast, and will within the long duration from now on, continue to keep increasing faster.Along with the growth of the universal and smart mobile phone of 3G, mobile broadband access, net book, portable notebook, more frequency will be used in 3G and mobile broadband access service, and developed country need continue to increase the dilatation of communication network.Meanwhile, emerging market economics also is in the Large-scale Mobile communication network networking stage, and the optimization of network is also a kind of trend of their future development with upgrading, thereby provides the wide market space for the development of mobile communication equipment industry.This all will promote global communications market all keeping higher speedup in the longer time in future, also ensure the sustainable growth of the market demand of antenna for base station industry.
The diplexer device more meeting of present stage for antenna for base station utilizes coaxial harmonic technology, and namely antenna for base station usually can be used coaxial resonance duplexer.Yet coaxial resonance duplexer commonly used, due to design limitation, can not meet the interior Insertion Loss of band low, the requirement of the high and high Q value of passband steepness.
The utility model content
The utility model provides a kind of resonant cavity and coaxial resonance duplexer, uses the coaxial resonance duplexer of this resonant cavity to have in band an Insertion Loss low, the advantage of the high and high Q value of passband steepness.
Therein in a kind of embodiment, described a kind of resonant cavity for coaxial resonance duplexer, it is that 29 millimeters, external diameter are that 10 millimeters, internal diameter are 8 millimeters that the height of described resonant cavity and width are height that 30 millimeters, length are the outer guiding post in 15 millimeters to 30 millimeters, cavity, and the diameter of being located at the inner guiding post in outer guiding post is 4 millimeters to 6 millimeters.
In embodiment, the degree of depth that described inner guiding post stretches into outer guiding post is adjustable therein.
Therein in embodiment, the cavity of described outer guiding post and the described resonant cavity structure that is formed in one.
In embodiment, described inner guiding post is bolt therein, and the mode that inner guiding post is threaded connection is fixing on the cover board.
A kind of coaxial resonance duplexer, comprise transmission channel, receive path, be positioned at the signal transmission cavity of transmission channel and receive path intersection and cover the cover plate above transmission channel, receive path and signal transmission cavity, it is characterized in that, described transmission channel and receive path include a plurality of resonant cavitys, it is that 29 millimeters, external diameter are that 10 millimeters, internal diameter are 8 millimeters that the height of described resonant cavity and width are height that 30 millimeters, length are the outer guiding post in 15 millimeters to 30 millimeters, cavity, and the diameter of being located at the inner guiding post in outer guiding post is 4 millimeters to 6 millimeters.
In embodiment, described transmission channel comprises eight resonant cavitys therein, and described receive path comprises seven resonant cavitys, between the adjacent resonators of transmission channel and receive path, has common wall, eight resonant cavitys of transmission channel are respectively the first transmission cavity, the second transmission cavity, the 3rd transmission cavity, the 4th transmission cavity, the 5th transmission cavity, the 6th transmission cavity, the 7th transmission cavity, the 8th transmission cavity, described the first transmission cavity, the second transmission cavity, the 3rd transmission cavity, the 4th transmission cavity, the 5th transmission cavity, the 6th transmission cavity, the 7th transmission cavity, the 8th transmission cavity is connected successively and is arranged into the array of 2*4, described the 5th transmission cavity directly is connected with the 8th transmission cavity, seven resonant cavitys of described receive path are respectively the first reception resonant cavity, second receives resonant cavity, the 3rd receives resonant cavity, the 4th receives resonant cavity, the 5th receives resonant cavity, the 6th receives resonant cavity, the 7th receives resonant cavity, described first receives resonant cavity, second receives resonant cavity, the 3rd receives resonant cavity, the 4th receives resonant cavity, the 5th receives resonant cavity, the 6th receives resonant cavity, the 7th receives resonant cavity is connected successively, the described the 4th receives resonant cavity and the 4th transmission cavity, the 5th reception resonant cavity and the 5th transmission cavity all have common wall, seven resonant cavitys of described receive path and the first transmission cavity of described transmission channel, the second transmission cavity, the 3rd transmission cavity, the 4th transmission cavity, the 5th transmission cavity, the 6th transmission cavity, the 7th transmission cavity be take the 5th common wall place straight line that receives resonant cavity and the 5th transmission cavity and is symmetrical arranged as symmetry axis.
In embodiment, described resonant cavity, outer guiding post and cover plate are made by metallic aluminium therein.
In embodiment, the outer surface of described resonant cavity, inner guiding post, outer guiding post and cover plate all is coated with silver or silver alloy therein.
In embodiment, described coaxial resonance duplexer also comprises that the intersection of at least three resonant cavitys being located at transmission channel or receive path produces the adjusting rod of transmission zero therein.
In embodiment, the two ends of described adjusting rod are provided with rosette therein.
Above-mentioned resonant cavity and coaxial resonance duplexer are designed according to the electromagnetic transmission theory, can find out that by Electromagnetic Simulation and actual test result the coaxial resonance duplexer that uses this resonant cavity has in band an Insertion Loss low, the advantage of the high and high Q value of passband steepness.
The accompanying drawing explanation
Fig. 1 is radio frequency sending and receiving network diagram;
The designs simplification block diagram that Fig. 2 is coaxial resonance duplexer;
The coaxial resonance duplexer schematic diagram that Fig. 3 is an embodiment;
One of them cavity resonator structure schematic diagram that Fig. 4 is coaxial resonance duplexer shown in Fig. 3;
Fig. 5 is test result schematic diagram when shown in Fig. 3, coaxial resonance duplexer receives signal;
Fig. 6 is test result schematic diagram when shown in Fig. 3, coaxial resonance duplexer transmits.
Embodiment
Fig. 1 has shown a radio frequency sending and receiving network.It comprises coaxial resonance duplexer 100, antenna 101, reflector 103 and receiver 104.Radio frequency sending and receiving network using common antenna 101, use together with receiver 104 for reflector 103.Coaxial resonance duplexer 100 is connected with reflector 103, receiver 104, antenna 101.Coaxial resonance duplexer 100 is to take the device that reflector 103 and receiver 104 be purpose.This will allow operation on antenna 101 that reflector 103 and receiver 104 can be identical at one time, and reflector 103 can not have a negative impact to receiver 104, and vice versa.
Fig. 2 is the simplified block diagram of coaxial resonance duplexer 100 structures.This coaxial resonance duplexer 100 comprises emission filter 201 and receiving filter 202.Emission filter 201 is transmitting energy under the radio transmission pattern, and receiving filter 202 is transmitting energy under the radio reception pattern.Source signal transmits by transmitting filter 201 and public port 203 from transmit port 205.Then, signal transmission is gone out by the antenna transmission that is connected to connectivity port 204.At receive direction, the reception antenna of wireless signal is connected to connectivity port 204 by public port 203.Then, signal arrives receiving port 206 by receiving filter 202.
Please refer to Fig. 3 and Fig. 4, an embodiment provides a kind of coaxial resonance duplexer 100.This coaxial resonance duplexer 100 comprises transmission channel, receive path, is positioned at the signal transmission cavity 120 of transmission channel and receive path intersection and covers the cover plate 190 above transmission channel, receive path and signal transmission cavity 120.Wherein, transmission channel comprises eight resonant cavitys, and receive path comprises seven resonant cavitys.There is common wall between the adjacent resonators of transmission channel and receive path.Signal transmission cavity 120 is connected with exterior antenna, is used for signal transmission.
Eight resonant cavitys of transmission channel are respectively the first transmission cavity 111, the second transmission cavity 112, the 3rd transmission cavity 113, the 4th transmission cavity 114, the 5th transmission cavity 115, the 6th transmission cavity 116, the 7th transmission cavity 117, the 8th transmission cavity 118.The first transmission cavity 111, the second transmission cavity 112, the 3rd transmission cavity 113, the 4th transmission cavity 114, the 5th transmission cavity 115, the 6th transmission cavity 116, the 7th transmission cavity 117, the 8th transmission cavity 118 are connected and are arranged into the array of 2*4 by the window on metallic walls successively.The 5th transmission cavity 115 directly is connected with the 8th transmission cavity 118.Offered the groove of connection effect on their common wall, the width of its middle slot is by the decision of the stiffness of coupling between resonant cavity, and stiffness of coupling is stronger, and the width of groove is larger.Like this, the cross-couplings between the 5th transmission cavity 115 and the 8th transmission cavity 118 will be better.
Seven resonant cavitys of receive path are respectively the first reception resonant cavity 131, the second reception resonant cavity 132, the 3rd receives resonant cavity 133, the 4th and receives resonant cavity 134, the 5th reception resonant cavity 135, the 6th reception resonant cavity 136, the 7th reception resonant cavity 137.The first reception resonant cavity 131, the second reception resonant cavity 132, the 3rd reception resonant cavity 133, the 4th reception resonant cavity 134, the 5th reception resonant cavity 135, the 6th reception resonant cavity 136, the 7th reception resonant cavity 137 are connected by the window on metallic walls successively.The 4th receives resonant cavity 134 and the 4th transmission cavity 114, the five reception resonant cavitys 135 and the 5th transmission cavity 115 all has common wall.Seven resonant cavitys of receive path and the first transmission cavity 111, the second transmission cavity 112, the 3rd transmission cavity 113, the 4th transmission cavity 114, the 5th transmission cavity 115, the 6th transmission cavity 116, the 7th transmission cavity 117 of transmission channel be take the 5th common wall place straight line that receives resonant cavity 135 and the 5th transmission cavity 115 and are symmetrical arranged as symmetry axis.
Be formed with a plurality of U-shaped structures in the transmission channel of this coaxial resonance duplexer 100 and receive path, for example: between the first transmission cavity 111 and the 3rd transmission cavity 113, be formed with the U-shaped structure; The 3rd reception resonant cavity 133 and the 5th receives between resonant cavity 135 and is formed with the U-shaped structure; The 5th reception resonant cavity 135 and the 7th receives between resonant cavity 137 and is formed with the U-shaped structure.These U-shaped structures can realize the magnetic cross-couplings, produce transmission zero, thereby effectively improve the receive path of this coaxial resonance duplexer 100 and the inhibition between transmission channel.The U-shaped structural configuration is in cover plate 190 bottoms, and two ends pass cover plate 190, thereby can externally regulate.
The transmission channel of this coaxial resonance duplexer 100 and receive path have been used altogether 15 resonant cavitys, and these 15 resonant cavitys form approximate 4*4 matrix layout, have produced enough transmission zeros, can meet the design needs.Because the resonant cavity number that this coaxial resonance duplexer uses is less and rationally distributed, so the small volume of this coaxial resonance duplexer.More transmission zero, also make this coaxial resonance duplexer 100 realize high selectivity, can play the effect that reduces resonance progression, reduces insertion loss simultaneously.Certainly, the utility model does not limit the particular location of each resonant cavity, and those skilled in the art person can suitably adjust the position of resonant cavity, and it is still within protection range of the present utility model.
Be provided with outer guiding post 170 in the cavity of the resonant cavity of transmission channel and receive path, be provided with inner guiding post 180 in outer guiding post 170, the degree of depth that inner guiding post 180 stretches into outer guiding post 170 is adjustable.Inner guiding post 180 herein is bolt, and the mode that inner guiding post 180 is threaded connection is fixed on cover plate 190.That is to say, cover plate 190 is provided with screwed hole, and the screw thread matched with screwed hole on cover plate 190 is arranged on inner guiding post 180, and the mode that inner guiding post 180 just can be threaded connection like this is fixed on cover plate 190.Simultaneously, inner guiding post 180 extend into part in outer guiding post 170.Stretch into by regulating inner guiding post 180 performance that the outer guiding post 170 interior degree of depth can be adjusted this coaxial resonance duplexer 100, to meet the needs of actual use.
The width of the cavity of the resonant cavity of transmission channel and receive path and highly be 30 millimeters, length can be 15 millimeters to 30 millimeters, width herein is 30 millimeters.The height of outer guiding post 170 is that 29 millimeters, external diameter are that 10 millimeters, internal diameter are 8 millimeters, and the diameter of inner guiding post 180 is 4 millimeters to 6 millimeters, and the diameter of inner guiding post 180 is 6 millimeters herein.The size of outer guiding post 170 is less, from but that the volume of resonant cavity does not need to do is larger, thereby further reduce this coaxial resonance duplexer 100 volumes when meeting performance requirement.
In this embodiment, the cavity of outer guiding post 170 and the resonant cavity of transmission channel and the receive path structure that is formed in one, in other embodiments, outer guiding post 170 can dismountablely be fixed on the bottom of resonant cavity.Resonant cavity, outer guiding post 170 and cover plate 190 are made by metallic aluminium.The surface of resonant cavity, inner guiding post 180, outer guiding post 170 and cover plate 190 all is coated with silver or silver alloy.Can improve like this Q value of this coaxial resonance duplexer 100, reduce pass band insertion loss, strengthen Out-of-band rejection.
This coaxial resonance duplexer 100 also comprises that the intersection of at least three resonant cavitys being located at transmission channel or receive path produces the adjusting rod of transmission zero.These adjusting rods comprise straight line adjusting rod 151 and U-shaped adjusting rod 152.Concrete, the first intersection that receives resonant cavity 131, the second reception resonant cavity 132, the 3rd reception resonant cavity 133, the 4th reception resonant cavity 134 is provided with straight line adjusting rod 151.The 3rd intersection that receives resonant cavity 133, the 4th reception resonant cavity 134, the 5th reception resonant cavity 135, the 6th reception resonant cavity 136 also is provided with U-shaped adjusting rod 152.The intersection of the 5th transmission cavity 115, the 6th transmission cavity 116, the 7th transmission cavity 117, the 8th transmission cavity 118 also is provided with straight line adjusting rod 151.The intersection of the first transmission cavity 111, the second transmission cavity 112, the 3rd transmission cavity 113, the 4th transmission cavity 114 is provided with U-shaped adjusting rod 152.The 5th intersection that receives resonant cavity 135, the 6th reception resonant cavity 136, the 7th reception resonant cavity 137 also is provided with U-shaped adjusting rod 152.
The two ends of straight line adjusting rod 151 and U-shaped adjusting rod 152 can be equipped with rosette 161, and rosette 161 can certainly be set.Straight line adjusting rod 151 and U-shaped adjusting rod 152 are used for realizing electrical cross-couplings, produce transmission zero, with the transmission channel that further improves this coaxial resonance duplexer 100 and the inhibition between receive path.The size of the length of straight line adjusting rod 151 and U-shaped adjusting rod 152 and rosette 161, by the decision of the stiffness of coupling between the cavity of each resonant cavity, is coupled stronger, and the length of straight line adjusting rod 151 and U-shaped adjusting rod 152 is longer, and the radius of rosette 161 is larger.
Transmission channel, receive path that this coaxial resonance duplexer is rearranged by several coaxial resonant cavities form.According to the electromagnetic transmission theory, resonant cavity along the height H of Electromagnetic Wave Propagation direction and resonance frequency sky 1 line 01S work 1 penetrate the 0A2C device frequently B two send out to connect penetrate 1 receipts 01 device 30 device 4 relational expressions and be:
In addition, relational expression:
CL, Z0, D, O, L, ε have been provided
r, μ
c, f relation.
CL wherein: conductor losses, Z
0: characteristic impedance, D: the internal diameter of outer conductor, O: inner wire diameter, L: conductor length, ε
r: dielectric constant, μ
c: the relative magnetic flux of conductor, f: frequency
The characteristic impedance of coaxial line can be expressed as:
In formula: a is half of outer guiding post external diameter in filter, half that b is cavity length.In addition, the selection principle of b and a meets following condition:
Maximum power capabilities condition: b/a > 1.65;
Minimal attenuation condition: b/a<3.592.
According to above principle and according to Electromagnetic Simulation and actual test result, we find band connection frequency at the width of the cavity of the desirable resonant cavity of 800-1000 megahertz and highly are 30 millimeters, and length is 15 millimeters to 30 millimeters; The diameter of inner guiding post is 4 millimeters to 6 millimeters.
Please refer to Fig. 5 and Fig. 6.This coaxial resonance duplexer 100 mainly is applicable to the communication system that communication frequency band is the 900MHz left and right.The transmitting terminal frequency of this coaxial resonance duplexer 100 be 900MHz to 1000MHz, the receiving terminal frequency is that 800MHz is to 950MHz.The characteristics such as this coaxial resonance duplexer 100, according to the design of generalized chebyshev Filter Principle, has in band and waits ripple, and the outer limited transmission zero of band is controlled, and the Out-of-band rejection degree is good.The utility model is used Agilent network analyzer 8753E to be tested this coaxial resonance duplexer 100, from test result, can find out: Insertion Loss is in-1.5dB in the passband of this coaxial resonance duplexer 100, Out-of-band rejection is high, in Peak Jitter 0.5dB scope, meets instructions for use.Shown in following Fig. 5,6, Fig. 5 high frequency one side, Fig. 6 low frequency one side waveform steepness are all larger, show that to be the passband steepness high; Obviously, it is high that demonstration is the Q value in the waveform turnover; In passband, waveform is straight, and it is little that demonstration is Peak Jitter; And the passband waveform reaches 0.5dB, illustrate that in band, Insertion Loss is low.In stopband waveform-below 90dB, illustrate that Out-of-band rejection is high.So it is little that this coaxial resonance duplexer 100 has a volume, in band, Insertion Loss is low, the advantage of the high and high Q value of passband steepness.
The transmission channel of this coaxial resonance duplexer and receive path have been used altogether 15 resonant cavitys, and these 15 resonant cavitys form approximate 4*4 matrix layout, have produced enough transmission zeros, can meet the design needs.Because the resonant cavity number that this coaxial resonance duplexer uses is less and rationally distributed, compact conformation, so the small volume of this coaxial resonance duplexer can meet the needs of miniaturization.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (10)
1. the resonant cavity for coaxial resonance duplexer, it is that 29 millimeters, external diameter are that 10 millimeters, internal diameter are 8 millimeters that the height of described resonant cavity and width are height that 30 millimeters, length are the outer guiding post in 15 millimeters to 30 millimeters, cavity, and the diameter of being located at the inner guiding post in outer guiding post is 4 millimeters to 6 millimeters.
2. the resonant cavity for coaxial resonance duplexer according to claim 1, is characterized in that, the degree of depth that described inner guiding post stretches into outer guiding post is adjustable.
3. the resonant cavity for coaxial resonance duplexer according to claim 2, is characterized in that, the cavity of described outer guiding post and the described resonant cavity structure that is formed in one.
4. the resonant cavity for coaxial resonance duplexer according to claim 2, is characterized in that, described inner guiding post is bolt, and the mode that inner guiding post is threaded connection is fixing on the cover board.
5. a coaxial resonance duplexer, comprise transmission channel, receive path, be positioned at the signal transmission cavity of transmission channel and receive path intersection and cover the cover plate above transmission channel, receive path and signal transmission cavity, it is characterized in that, described transmission channel and receive path include a plurality of resonant cavitys, it is that 29 millimeters, external diameter are that 10 millimeters, internal diameter are 8 millimeters that the height of described resonant cavity and width are height that 30 millimeters, length are the outer guiding post in 15 millimeters to 30 millimeters, cavity, and the diameter of being located at the inner guiding post in outer guiding post is 4 millimeters to 6 millimeters.
6. coaxial resonance duplexer according to claim 5, is characterized in that, described transmission channel comprises eight resonant cavitys, and described receive path comprises seven resonant cavitys, between the adjacent resonators of transmission channel and receive path, has common wall, eight resonant cavitys of transmission channel are respectively the first transmission cavity, the second transmission cavity, the 3rd transmission cavity, the 4th transmission cavity, the 5th transmission cavity, the 6th transmission cavity, the 7th transmission cavity, the 8th transmission cavity, described the first transmission cavity, the second transmission cavity, the 3rd transmission cavity, the 4th transmission cavity, the 5th transmission cavity, the 6th transmission cavity, the 7th transmission cavity, the 8th transmission cavity is connected successively and is arranged into the array of 2*4, described the 5th transmission cavity directly is connected by window with the 8th transmission cavity, seven resonant cavitys of described receive path are respectively the first reception resonant cavity, second receives resonant cavity, the 3rd receives resonant cavity, the 4th receives resonant cavity, the 5th receives resonant cavity, the 6th receives resonant cavity, the 7th receives resonant cavity, described first receives resonant cavity, second receives resonant cavity, the 3rd receives resonant cavity, the 4th receives resonant cavity, the 5th receives resonant cavity, the 6th receives resonant cavity, the 7th receives resonant cavity is connected successively, the described the 4th receives resonant cavity and the 4th transmission cavity, the 5th reception resonant cavity and the 5th transmission cavity all have common wall, seven resonant cavitys of described receive path and the first transmission cavity of described transmission channel, the second transmission cavity, the 3rd transmission cavity, the 4th transmission cavity, the 5th transmission cavity, the 6th transmission cavity, the 7th transmission cavity be take the 5th common wall place straight line that receives resonant cavity and the 5th transmission cavity and is symmetrical arranged as symmetry axis.
7. coaxial resonance duplexer according to claim 6, is characterized in that, described resonant cavity, outer guiding post and cover plate are made by metallic aluminium.
8. coaxial resonance duplexer according to claim 7, is characterized in that, the outer surface of described resonant cavity, inner guiding post, outer guiding post and cover plate all is coated with silver or silver alloy.
9. coaxial resonance duplexer according to claim 8, is characterized in that, described coaxial resonance duplexer also comprises that the intersection of at least three resonant cavitys being located at transmission channel or receive path produces the adjusting rod of transmission zero.
10. coaxial resonance duplexer according to claim 9, is characterized in that, the two ends of described adjusting rod are provided with rosette.
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| CN2013203283709U CN203326078U (en) | 2013-06-07 | 2013-06-07 | Resonant cavity applied to coaxial resonant duplexer and coaxial resonant duplexer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104241797A (en) * | 2013-06-07 | 2014-12-24 | 苏州络湾电子科技有限公司 | Resonant cavity for coaxial resonant diplexer, and coaxial resonant diplexer thereof |
| CN111682293A (en) * | 2014-12-15 | 2020-09-18 | 康普公司意大利有限责任公司 | Resonant filter |
-
2013
- 2013-06-07 CN CN2013203283709U patent/CN203326078U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104241797A (en) * | 2013-06-07 | 2014-12-24 | 苏州络湾电子科技有限公司 | Resonant cavity for coaxial resonant diplexer, and coaxial resonant diplexer thereof |
| CN111682293A (en) * | 2014-12-15 | 2020-09-18 | 康普公司意大利有限责任公司 | Resonant filter |
| CN111682293B (en) * | 2014-12-15 | 2021-12-31 | 康普公司意大利有限责任公司 | Resonant filter |
| US11757164B2 (en) | 2014-12-15 | 2023-09-12 | Commscope Italy S.R.L. | In-line filter having mutually compensating inductive and capactive coupling |
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