CN205621822U - High isolation low pass band -pass triplexer - Google Patents
High isolation low pass band -pass triplexer Download PDFInfo
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Abstract
The utility model discloses a high isolation low pass band -pass triplexer, including low pass filter (5), two band pass filter (6, 7) and transmission line (8), wherein two minor matters of opening a way in low pass filter (5) produce the transmission zero that two frequencies are band pass filter (6, 7) central frequency respectively, and it is short -circuit state to make its central frequency signal at two band pass filter at the input department of low pass filter (5), be equipped with setpoint p1 on transmission line (8), P2, P3, P1 to p3 distance wherein, P2 corresponds band pass filter central frequency's quarter wavelength respectively to the p3 distance, invert according to the quarter wavelength impedance, band pass filter (6, 7 )The central frequency signal at p1, P2 is the open -circuit condition respectively, convenient each low pass band pass filter that independently designs of this triplexer, make it each other not influence, the design cycle can be shortened and design efficiency is improved, and this structure can obtain high isolation.
Description
Technical field
This utility model relates to the technical field of flat filter, leads to triplexer particularly to a kind of high-isolation lower passband.
Background technology
Developing rapidly of Modern wireless communication technology, while making speed that people transmit in pursuit information and quality, the most constantly pursues convenient, the quick and various informative mode of intelligence transmission.The compatible multiple communication standards of fast development of communication technology, this just can allow terminal use enjoy the service that different operators provides simultaneously.Would operate in the multiple communication standard of different frequencies and be integrated in a system, use identical platform to realize in the system of multiple communication standard, it is possible to realize antenna duplexer, the combining filter abbreviation multiplexer of Frequency Division Multiplex is a Primary Component.
In the design of multiplexer, the matching network how designing multiplexer is design difficulty to improve isolation.At present, the multiplexer of band filter combination designing comparative maturity, but the multiplexer method in design combined by low pass filter and band filter is the most few, the design that the lower passband of high-isolation leads to multiplexer is the most few.Owing to microstrip structure is planar structure, it is easy to fabrication design, low cost, performance meets actual requirement, and therefore the design of the logical multiplexer of the plane low pass-band of high-isolation is study hotspot in recent years.
1999, M.H.Capstisk delivers the paper of entitled " Microstrip lowpass-bandpass diplexer topology " on " IEEE Electronic Letter ", structure is illustrated in fig. 1 shown below, one low pass filter and a band filter are simply connected by it, form the logical duplexer of a low pass-band, this article elaboration has deficient detailed, it is difficult to accomplish lower passband bandpass filter independent design.
2013, Pu-Hua Deng et al. delivers the paper of entitled " Design of Microstrip Lowpass-Bandpass Diplexer " on " IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS ", structure is illustrated in fig. 2 shown below, low pass filter is attached by quarter-wave transformer with band filter, constitute the logical duplexer of a low pass-band, although its lower passband bandpass filter can be with independent design, but this structure cannot be applied to the logical triplexer design of low pass-band, and isolation performance has much room for improvement.
Utility model content
The purpose of this utility model is that the shortcoming overcoming prior art is with not enough, a kind of high-isolation lower passband is provided to lead to triplexer, this design is by being improved to two different open circuit minor matters of length to the minor matters of low pass filter input by traditional single uniform impedance minor matters, produce the transmission zero of two two band filter mid frequencyes the most corresponding, therefore the center frequency signal that two band filters of low pass filter input end are corresponding is all short-circuit condition, and be inverted according to quarter-wave impedance, it is open-circuit condition at distance low pass filter input mid frequency corresponding wavelength 1/4th, therefore, if terminating a band filter at this respectively at two, can accomplish that three wave filter independent design are without influencing each other, it is greatly improved isolation performance.
The purpose of this utility model is achieved through the following technical solutions:
A kind of high-isolation lower passband leads to triplexer, it is produced in the manner of a printed circuit board on medium substrate, make respectively on the same face of described medium substrate and have the input feeder line head port1 for inputting electromagnetic wave signal, low pass filter 5 and its outfan feeder line head port2 being used for exporting electromagnetic wave signal, it is operated in the first band filter 6 of frequency range 1 and it is for exporting the outfan feeder line head port3 of electromagnetic wave signal, it is operated in the second band filter 7 of frequency range 2 and it is for exporting the outfan feeder line head port4 of electromagnetic wave signal, transmission line 8, the another side of this medium substrate is earth plate；
First end of described transmission line 8 is connected with described input feeder line head port1, and its second end is connected with described low pass filter 5；Described first band filter 6 and the second band filter 7 lay respectively at the both sides of described transmission line 8；
Described transmission line 8 is provided with anchor point p1, p2, p3, described anchor point p1 to described anchor point p3 distance, the quarter-wave of the most corresponding described first band filter the 6, second band filter 7 mid frequency of described anchor point p2 to described anchor point p3 distance.
Further, described low pass filter 5 includes 51,52,53,54,55,56 and 2 high impedance stubs 57,58 of 3 pairs of Low ESR stubs, incoming feeder Port1 and output feeder Port2, described incoming feeder 501 is a part for described transmission line 8, and the first end of described incoming feeder 501 corresponds to the second end of described transmission line 8.
Further, second end of described Low ESR open stub 51 corresponds to, to the length of transmission line of the first end of incoming feeder 501, the quarter-wave that described second band filter 6 mid frequency is corresponding, and the length of transmission line of the first end of the second end of described transmission line 52 to incoming feeder 501 corresponds to the quarter-wave that described first band filter 7 mid frequency is corresponding.
Further, described first band filter 6 includes incoming feeder 601, output feeder the 602, first resonator the 61, second resonator 62 and the 3rd resonator 63, wherein said first resonator 61 is 1/2nd wavelength that described first band filter 6 mid frequency is corresponding with the resonator length of described 3rd resonator 63, and two ends are open circuit；
Wherein said second resonator 62 is U-shaped step impedance resonator, and two ends are all open circuits, and the mid frequency that the resonant frequency of described second resonator 62 is described first band filter 6.
Further, the first end of the corresponding described transmission line 8 of described incoming feeder 601 is to that section of described anchor point p1；
Described first resonator 61 includes upside transmission line 611, intermediate conveyor line 612 and downside transmission line 613, wherein said upside transmission line 611 is adjacent and parallel with described incoming feeder 601, the two ends of described intermediate conveyor line 612 respectively with described upside transmission line 611 and downside transmission line 613 is vertical is connected, and described intermediate conveyor line 612 is positioned on straight line with described anchor point p1.
Further, described second band filter 7 includes incoming feeder 701, output feeder the 702, the 4th resonator the 71, the 5th resonator 72 and sixth resonator 73, wherein said 4th resonator 71 is 1/2nd wavelength that described second band filter 7 mid frequency is corresponding with the resonator length of described sixth resonator 73, and two ends are open circuit；
Wherein said 5th resonator 72 is U-shaped step impedance resonator, and two ends are all open circuits, and the mid frequency that the resonant frequency of described 5th resonator 72 is described second band filter 7.
Further, that section of the first end of the corresponding described transmission line 8 of described incoming feeder 701 to described anchor point p2, incoming feeder comprises horizontal component 7011 and vertical portion 7012；
Described 4th resonator 71 includes downside transmission line 711 and intermediate conveyor line 712 and upside transmission line 713, wherein said downside transmission line 711 is adjacent and parallel with the horizontal component 7011 of described incoming feeder, described intermediate conveyor line 712 is adjacent and parallel with the vertical portion 7012 of described incoming feeder, the two ends of described intermediate conveyor line 712 respectively with described downside transmission line 711 and upside transmission line 713 is vertical is connected, and described upside transmission line 713 is positioned on straight line with described anchor point p2.
Further, input feed or the output feed of described first band filter 6, described second band filter 7 and described low pass filter 5 uses tap feed or couple feed.
Further, each transmission line uses microstrip line, and is the form of straight line or broken line.
This utility model has such advantages as relative to prior art and effect:
1) this utility model realizes low pass filter by multiple high low-impedance lines, does not has coupled structure, simple in construction, and the design cycle is short, and insertion loss is low.
2) this utility model is owing to low pass filter is against the Low ESR open circuit minor matters loading structure of one end of band filter employing uniqueness, produce frequency and correspond to the transmission zero of two band filter mid frequencyes respectively, when making to be attached band filter and this low pass filter by quarter-wave distance, band filter performance is unaffected, such that it is able to accomplish each lower passband bandpass filter of independent design, obtain high-isolation, finally the most simply connect, be substantially reduced the design difficulty of triplexer.
3) lower passband disclosed in this utility model leads to the structure of triplexer and has low insertion loss, the advantage of high-isolation.
4) lower passband disclosed in this utility model leads to triplexer microstrip structure can be used to realize, and lightweight, low cost, is suitable for industrial mass manufacture, and therefore triplexer possesses simple in construction, designs advantage easy, cheap for manufacturing cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of duplexer disclosed in prior art 1；
Fig. 2 is the structural representation of a kind of duplexer disclosed in prior art 2；
Fig. 3 is the overall structure schematic diagram that the high-isolation lower passband that the utility model proposes leads to triplexer；
Fig. 4 is that the high-isolation lower passband that the utility model proposes leads to the structural representation of low pass filter in triplexer；
Fig. 5 is that the high-isolation lower passband that the utility model proposes leads to the structural representation of the first band filter in triplexer；
Fig. 6 is that the high-isolation lower passband that the utility model proposes leads to the structural representation of the second band filter in triplexer；
Fig. 7 is the straight-through effect emulation figure that the high-isolation lower passband that the utility model proposes leads to triplexer；
Fig. 8 is the isolation effect analogous diagram that the high-isolation lower passband that the utility model proposes leads to triplexer.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearer, clear and definite, this utility model is further described by the embodiment that develops simultaneously referring to the drawings.Should be appreciated that specific embodiment described herein, only in order to explain this utility model, is not used to limit this utility model.
Embodiment
Referring to Fig. 3, Fig. 3 is the overall structure schematic diagram that the high-isolation lower passband disclosed in this utility model embodiment leads to triplexer.High-isolation lower passband as depicted leads to triplexer, it is produced in the manner of a printed circuit board on medium substrate, make respectively on the same face of described medium substrate and have the input feeder line head port1 for inputting electromagnetic wave signal, one low pass filter 5 and this low pass filter 5 are for exporting the outfan feeder line head port2 of electromagnetic wave signal, one the first band filter 6 being operated in frequency range 1 and this first band filter 6 are for exporting the outfan feeder line head port3 of electromagnetic wave signal, one the second band filter 7 being operated in frequency range 2 and this second band filter 7 are for exporting the outfan feeder line head port4 of electromagnetic wave signal, article one, the transmission line 8 of 50 ohm, the another side of this medium substrate is earth plate.
First end of transmission line 8 is connected with described input feeder line head port1, and its second end is connected with described low pass filter 5；First band filter 6 and the second band filter 7 lay respectively at the both sides up and down of described transmission line 8.
Transmission line 8 is provided with three anchor points p1, p2, p3, wherein anchor point p3 the second end being positioned at transmission line 8 as a reference point, the quarter-wave of corresponding first band filter 6 mid frequency of anchor point p1 to anchor point p3 distance length, the quarter-wave of anchor point p2 to anchor point p3 distance corresponding second band filter 7 mid frequency respectively；Anchor point p1 is for limiting described first band filter 6 distance to described anchor point p3, and is bent, in order to reduce the size of multiplexer.Anchor point p2 is for limiting described second band filter 7 horizontal range to described anchor point p3.It is inverted according to quarter-wave impedance, when band filter 6 works, open-circuit condition it is respectively equivalent at p1, p2, low pass filter 5 on its substantially without impact, this design great advantage is to accomplish each lower passband bandpass filter of independent design, and it is mutually unaffected, and is greatly improved isolation performance, and shorten the design cycle, improve design efficiency.
The structure of low pass filter 5 as shown in Figure 4, including the incoming feeder 501 for feed-in electromagnetic wave signal, for feeding out the output feeder head port2 of electromagnetic wave signal and output feeder 502, wherein incoming feeder 501 and output feeder 502 is the coupling impedance of 50 ohm.Incoming feeder 501 is a part for described transmission line 8, and the first end of incoming feeder 501 corresponds to the second end of transmission line 8.Definition incoming feeder 501 is the first end near that one end of low pass filter 5, and that one end away from low pass filter 5 is the second end, and transmission line 8 is the second end near that one end of low pass filter 5, and transmission line 8 is the first end away from that one end of low pass filter 5.
Low pass filter 5 also includes 51,52,53,54,55,56 and 2 sections of high impedance stubs 57,58 of 3 pairs of Low ESR stubs.Wherein Low ESR stub 53,55 and Low ESR stub 54,56 are symmetrical about the centrage of high impedance stub 57,58.Low ESR stub 53 is formed by connecting by two sections of uneven impedance stubs 531,532, Low ESR stub 54 is formed by connecting by two sections of uneven impedance stubs 541,542, compare than conventional uniform impedance stub structure, a transmission zero can be produced more, thus improve the band external characteristics of low pass filter.
The structure of the first band filter 6 as shown in Figure 5, including the incoming feeder 601 for feed-in electromagnetic wave signal, for feeding out the output feeder head port3 of electromagnetic wave signal and output feeder 602, wherein incoming feeder 601 and output feeder 602 is the coupling impedance of 50 ohm.
First band filter 6 also includes three resonators, three resonators are respectively first resonator the 61, second resonator the 62, the 3rd resonator 63, wherein the first resonator 61 is 1/2nd wavelength that this first band filter 6 mid frequency is corresponding with the resonator length of the 3rd resonator 63, and wherein the resonant frequency of the second resonator 62 is the mid frequency of the first band filter 6.Meanwhile, the first resonator 61 and the 3rd resonator 63, centered by the second resonator 62, are symmetrical arranged.
It addition, the two ends of the first resonator 61 of the first band filter 6 and the 3rd resonator 63 are open circuit, and the transmission line of resonator has carried out bending fold in order to reduce size.
Second resonator 62 of the first band filter 6 is U-shaped step impedance resonator, and the two ends of U-shaped Stepped Impedance are all open circuits, by appropriate design step impedance resonator, the first band filter can be made to obtain the characteristic of Wide stop bands.
Input feed and the output feed of the first band filter 6 all use the mode of couple feed to carry out.Incoming feeder 601 is coupled with the upside transmission line 611 of the first resonator 61 in the first band filter 6, and spacing and length that incoming feeder 601 couples with the first resonator 611 may serve to optimize the band internal characteristic of the first band filter 6.
First end of the corresponding transmission line 8 of incoming feeder 601 is to that section of described anchor point p1；First resonator 61 of the first band filter 6 includes upside transmission line 611, intermediate conveyor line 612 and downside transmission line 613, wherein upside transmission line 611 is adjacent with incoming feeder 601 and parallel, the two ends of intermediate conveyor line 612 respectively with upside transmission line 611 and downside transmission line 613 is vertical is connected, and intermediate conveyor line 612 is positioned on straight line with anchor point p1.
The structure of the second band filter 7 as shown in Figure 6, including the incoming feeder 701 for feed-in electromagnetic wave signal, for feeding out the output feeder head port4 of electromagnetic wave signal and output feeder 702, wherein incoming feeder 701 and output feeder 702 is the coupling impedance of 50 ohm.
Second band filter also includes three resonators, three resonators are respectively the 4th resonator the 71, the 5th resonator 72, sixth resonator 73, wherein the 4th resonator 71 is 1/2nd wavelength that this first band filter 7 mid frequency is corresponding with the resonator length of sixth resonator 73, and wherein the resonant frequency of the 5th resonator 72 is the mid frequency of the second band filter 7；Meanwhile, the 4th resonator 71 and sixth resonator 73, centered by the 5th resonator 72, are symmetrical arranged.
It addition, the two ends of the 4th resonator 71 of the second band filter 7 and sixth resonator 73 are open circuit, and the transmission line of resonator has carried out bending fold in order to reduce size.
5th resonator 72 of the second band filter 7 is U-shaped step impedance resonator, and the two ends of U-shaped Stepped Impedance are all open circuits, by appropriate design step impedance resonator, the second band filter can be made to obtain the characteristic of Wide stop bands.
Input feed and the output feed of the second band filter 7 all use the mode of couple feed to carry out.Incoming feeder 701 is coupled with the downside transmission line 711 of the 4th resonator 71 in the first band filter 7, and spacing and length that incoming feeder 701 couples with the 4th resonator 71 may serve to optimize the band internal characteristic of the first band filter 7.
First end of the corresponding transmission line 8 of incoming feeder 701 is to that section of described anchor point p2；4th resonator 71 of the second band filter 7 includes downside transmission line 711, intermediate conveyor line 712 and upside transmission line 713, wherein downside transmission line 711 is adjacent with incoming feeder 701 and parallel, the two ends of intermediate conveyor line 712 respectively with upside transmission line 711 and downside transmission line 713 is vertical is connected, and intermediate conveyor line 612 is positioned on straight line with anchor point p2.
Input feed and the output feed of above first band filter the 6, second band filter 7 and low pass filter 5 use tap feed or couple feed, and their bandwidth is determined by the spacing between resonator.The above transmission line uses microstrip line, and is the form of straight line or broken line.
The logical triplexer integral manufacturing of high-isolation low pass-band, on the medium substrate of double-sided copper-clad, uses machinery to scribe, the technology such as laser scoring, circuit board corrosion all can easily make.Core content of the present utility model is the transmission zero by simple minor matters specification for structure low pass filter of opening a way, the relative position of the placement of three wave filter of specification is such that it is able to accomplish three wave filter of independent design, and its performance will not influence each other, it is substantially improved the isolation of triplexer.
It is 2.55 that the high-isolation lower passband of the present embodiment lead to triplexer to be produced on dielectric constant in the manner of a printed circuit board, thickness is on the politef double-sided copper-clad micro-strip plate of 0.8mm, detailed construction is as shown in Figure 1,2,3, 4, overall dimensions is 102mm × 58mm, and simulated effect is as shown in Figure 5,6.This plane lower passband leads to triplexer superior performance, especially isolation characteristic, is all higher than 49dB 0～5GHz, meets actual operation requirements.
Fig. 7,8 showing that high-isolation lower passband leads to straight-through effect and the simulation result of isolation effect of triplexer, transverse axis represents that in this utility model, high-isolation lower passband leads to the signal frequency of triplexer, and the longitudinal axis represents signal amplitude, wherein S11Represent the reflection coefficient looked to port 1, Sij(i ≠ j) shows the port j transmission coefficient to port i.Signal is when certain Single port inputs, and the part input power of signal is reflected back toward signal source, and the power reflected becomes reflection power.S11Having reacted the relation between the input power of signal and the reflection power of signal, its corresponding mathematical function is as follows: reflection power/incident power=20*log | S11|, and Sij(i ≠ j) corresponding mathematical function is: output/input power (dB)=20*log | Sij|。
Low pass filter-1dB the cut-off frequency that high-isolation lower passband of the present utility model leads in triplexer is 1GHz, and stopband is suppressed over 22dB, and stopband highest frequency is more than 7.5GHz.Band filter 6 mid frequency being operated in frequency range 1 is 2.4GHz, and insertion loss is less than 1.8dB, and return loss absolute value is more than 24dB, and three dB bandwidth is 120MHz.Band filter 7 mid frequency being operated in frequency range 2 is 3.5GHz, and insertion loss is less than 2.0dB, and return loss absolute value is more than 33dB, and three dB bandwidth is 150MHz.In 0-5GHz frequency, the isolation S of the logical triplexer of plane low pass-band23Absolute value more than 54dB, isolation S24Absolute value more than 54dB, isolation S43Absolute value more than 49dB.This lower passband leads to triplexer superior performance, and isolation is high, meets actual operation requirements.
Above-described embodiment is this utility model preferably embodiment; but embodiment of the present utility model is also not restricted to the described embodiments; other any without departing from the change made under spirit of the present utility model and principle, modify, substitute, combine, simplify; all should be the substitute mode of equivalence, within being included in protection domain of the present utility model.
Claims (9)
1. high-isolation lower passband leads to a triplexer, is produced in the manner of a printed circuit board on medium substrate, it is characterised in that:
Making respectively on the same face of described medium substrate and have for inputting the input feeder line head port1 of electromagnetic wave signal, low pass filter (5) and it is for exporting the outfan feeder line head port2 of electromagnetic wave signal, being operated in first band filter (6) of frequency range 1 and it is used for exporting the outfan feeder line head port3 of electromagnetic wave signal, is operated in second band filter (7) of frequency range 2 and it is used for exporting the outfan feeder line head port4 of electromagnetic wave signal, transmission line (8), the another side of this medium substrate is earth plate；
First end of described transmission line (8) is connected with described input feeder line head port1, and its second end is connected with described low pass filter (5)；Described first band filter (6) and the second band filter (7) lay respectively at the both sides of described transmission line (8)；
Described transmission line (8) is provided with anchor point p1, p2, p3, described anchor point p1 to described anchor point p3 distance, described anchor point p2 to described anchor point p3 distance the most corresponding described first band filter (6), the quarter-wave of the second band filter (7) mid frequency.
A kind of high-isolation lower passband the most according to claim 1 leads to triplexer, it is characterized in that: described low pass filter (5) includes 3 pairs of Low ESR stubs (51,52,53,54,55,56) and 2 high impedance stubs (57,58), incoming feeder Port1 and output feeder Port2, described incoming feeder (501) is a part for described transmission line (8), and the first end of described incoming feeder (501) corresponds to the second end of described transmission line (8).
A kind of high-isolation lower passband the most according to claim 2 leads to triplexer, it is characterized in that: the length of transmission line of the second end of described Low ESR open stub (51) to the first end of incoming feeder (501) corresponds to the quarter-wave that described second band filter (6) mid frequency is corresponding, the length of transmission line of the second end of described transmission line (52) to the first end of incoming feeder (501) corresponds to the quarter-wave that described first band filter (7) mid frequency is corresponding.
A kind of high-isolation lower passband the most according to claim 1 leads to triplexer, it is characterized in that: described first band filter (6) includes incoming feeder (601), output feeder (602), the first resonator (61), the second resonator (62) and the 3rd resonator (63), wherein said first resonator (61) is, with the resonator length of described 3rd resonator (63), 1/2nd wavelength that described first band filter (6) mid frequency is corresponding, and two ends are open circuit；
Wherein said second resonator (62) is U-shaped step impedance resonator, and two ends are all open circuits, and the mid frequency that the resonant frequency of described second resonator (62) is described first band filter (6).
A kind of high-isolation lower passband the most according to claim 4 leads to triplexer, it is characterised in that: the first end of the corresponding described transmission line of described incoming feeder (601) (8) is to that section of described anchor point p1；
Described first resonator (61) includes upside transmission line (611), intermediate conveyor line (612) and downside transmission line (613), wherein said upside transmission line (611) is adjacent and parallel with described incoming feeder (601), the two ends of described intermediate conveyor line (612) respectively with described upside transmission line (611) and downside transmission line (613) is vertical is connected, and described intermediate conveyor line (612) is positioned on straight line with described anchor point p1.
A kind of high-isolation lower passband the most according to claim 1 leads to triplexer, it is characterized in that: described second band filter (7) includes incoming feeder (701), output feeder (702), the 4th resonator (71), the 5th resonator (72) and sixth resonator (73), wherein said 4th resonator (71) is 1/2nd wavelength that described second band filter (7) mid frequency is corresponding with the resonator length of described sixth resonator (73), and two ends are open circuit；
Wherein said 5th resonator (72) is U-shaped step impedance resonator, and two ends are all open circuits, and the mid frequency that resonant frequency is described second band filter (7) of described 5th resonator (72).
A kind of high-isolation lower passband the most according to claim 6 leads to triplexer, it is characterized in that: the first end of the corresponding described transmission line of described incoming feeder (701) (8) is to that section of described anchor point p2, and incoming feeder comprises horizontal component (7011) and vertical portion (7012)；
Described 4th resonator (71) includes downside transmission line (711) and intermediate conveyor line (712) and upside transmission line (713), wherein said downside transmission line (711) is adjacent and parallel with the horizontal component of described incoming feeder (7011), described intermediate conveyor line (712) is adjacent and parallel with the vertical portion of described incoming feeder (7012), the two ends of described intermediate conveyor line (712) respectively with described downside transmission line (711) and upside transmission line (713) is vertical is connected, and described upside transmission line (713) and described anchor point p2 are positioned on straight line.
A kind of high-isolation lower passband the most according to claim 1 leads to triplexer, it is characterised in that: input feed or the output feed of described first band filter (6), described second band filter (7) and described low pass filter (5) use tap feed or couple feed.
9. lead to triplexer according to the arbitrary described a kind of high-isolation lower passband of claim 1 to 8, it is characterised in that: each transmission line uses microstrip line, and is the form of straight line or broken line.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105489980A (en) * | 2015-12-18 | 2016-04-13 | 华南理工大学 | High-isolation low-pass and band-pass triplexer |
| CN107834135A (en) * | 2017-11-21 | 2018-03-23 | 华南理工大学 | A kind of plane triplexer based on minor matters loading structure |
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2015
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105489980A (en) * | 2015-12-18 | 2016-04-13 | 华南理工大学 | High-isolation low-pass and band-pass triplexer |
| CN107834135A (en) * | 2017-11-21 | 2018-03-23 | 华南理工大学 | A kind of plane triplexer based on minor matters loading structure |
| CN107834135B (en) * | 2017-11-21 | 2020-02-18 | 华南理工大学 | Planar triplexer based on branch knot loading structure |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161005 Termination date: 20181218 |