CN204375881U - Plane lower passband leads to triplexer - Google Patents
Plane lower passband leads to triplexer Download PDFInfo
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- CN204375881U CN204375881U CN201520009361.2U CN201520009361U CN204375881U CN 204375881 U CN204375881 U CN 204375881U CN 201520009361 U CN201520009361 U CN 201520009361U CN 204375881 U CN204375881 U CN 204375881U
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Abstract
The utility model discloses a kind of plane lower passband and leads to triplexer, comprise low pass filter (11), two band pass filters (12), (13) and transmission lines (14), two minor matters wherein in low pass filter (11) load resonator and produce the transmission zero that two frequencies are respectively band pass filter (12) and (13) centre frequency, make it be short-circuit condition in the center frequency signal of input end two band pass filters of low pass filter (11); Transmission line (14) is provided with anchor point p1, p2, p3, the wherein quarter-wave of p1 to p3 distance, the corresponding band pass filter centre frequency of p2 to p3 distance difference, be inverted according to quarter-wave impedance, band pass filter (12) is respectively open-circuit condition with the center frequency signal of (13) at p1, p2, this triplexer facilitates each lower passband bandpass filter of independent design, make it be independent of each other, the design cycle can be shortened and improve design efficiency.
Description
Technical field
The utility model relates to the technical field of flat filter, and particularly a kind of plane lower passband leads to triplexer.
Background technology
In recent years, wireless communication technology develops rapidly, and the demand of people to radio communication service increases day by day, and in order to meet the various demand of people, communication system will compatible multiple communication standard when designing.Wireless communication system of today, substantially be all the system of multiplex (MUX), for time multiplex, as long as by receipts be arranged in different timeslices and just can have dealt with problems, and for Frequency Division Multiplex, in order to the quantity reducing filtering device then needs the special device of design not cause mutually interference to isolate different signals, such device is exactly multiplexer.
At present, the multiplexer combined by band pass filter designs comparative maturity, but the multiplexer combined by low pass filter and band pass filter method few in design, can each filter of independent design and can simple combination method together few especially.Because microstrip structure is easy to fabrication design, cost is low, and performance meets actual requirement, and is planar structure, is easy to integrated with other components and parts, and the design of the logical multiplexer of therefore excellent plane low pass-band is study hotspot in recent years.
1999, M.H.Capstisk delivers the paper being entitled as " Microstrip lowpass-bandpass diplexer topology " on " IEEE Electronic Letter ", structure is illustrated in fig. 1 shown below, a low pass filter simply connects with a band pass filter by it, form the logical duplexer of a low pass-band, this article elaboration has deficient detailed, is difficult to accomplish lower passband bandpass filter independent design.
2013, the people such as Pu-Hua Deng deliver the paper being entitled as " 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 connected by quarter-wave transformer with band pass filter, form the logical duplexer of a low pass-band, although its lower passband bandpass filter can independent design, but this structure cannot be applied to the logical triplexer design of low pass-band, and its low pass filter performance is to be improved.
Utility model content
The purpose of this utility model is that the shortcoming overcoming prior art is with not enough, a kind of plane lower passband is provided to lead to triplexer, this design is by being improved to by traditional uniform impedance minor matters the minor matters that open circuit minor matters load to the minor matters of low pass filter input, produce the transmission zero of two corresponding two band pass filter centre frequencies of difference, therefore the center frequency signal that low pass filter input end two band pass filters are corresponding is all short-circuit condition, and be inverted according to quarter-wave impedance, distance low pass filter input centre frequency corresponding wavelength 1/4th place is open-circuit condition, therefore, if at this two place difference termination band pass filter, three filter independent design can be accomplished and can not influence each other.
The purpose of this utility model is achieved through the following technical solutions:
A kind of plane lower passband leads to triplexer, be produced in the manner of a printed circuit board on medium substrate, the same face of described medium substrate is manufactured with respectively the input feeder line head port1 for inputting electromagnetic wave signal, low pass filter 11 and it is for exporting the output feeder line head port2 of electromagnetic wave signal, be operated in the first band pass filter 12 of frequency range 1 and it is for exporting the output feeder line head port3 of electromagnetic wave signal, be operated in the second band pass filter 13 of frequency range 2 and it is for exporting the output feeder line head port4 of electromagnetic wave signal, transmission line (14), the another side of this medium substrate is ground plate,
The first end of described transmission line 14 is connected with described input feeder line head port1, and its second end is connected with described low pass filter 11; Described first band pass filter 12 and the second band pass filter 13 lay respectively at the both sides of described transmission line 14;
Described transmission line 14 is provided with anchor point p1, p2, p3, wherein said anchor point p3 is positioned at the second end of transmission line 14, and described anchor point p1 distinguishes the quarter-wave of corresponding described first band pass filter 12, second band pass filter 13 centre frequency to described anchor point p3 distance, described anchor point p2 to described anchor point p3 distance;
Described anchor point p1 is for limiting the horizontal range of described first band pass filter 12 to described anchor point p3, and described anchor point p2 is for limiting the horizontal range of described second band pass filter 13 to described anchor point p3.
Further, described low pass filter 11 comprises six resonators, incoming feeder 110 and output feeder 1110, described incoming feeder 110 is a part for described transmission line 14, and the first end of described incoming feeder 110 corresponds to the second end of described transmission line 14;
First resonator of described low pass filter 11 comprises transmission line 1111 and transmission line 1121, and the two vertically connects and composes minor matters and loads resonator; Second resonator of described low pass filter 11 comprises transmission line 1112 and transmission line 1122, the two vertically connects and composes minor matters and loads resonator, and the first end of transmission line 1111 is connected with the first end of incoming feeder 110 is vertical after being connected with the first end straight line of transmission line 1112 respectively;
3rd resonator of described low pass filter 11 comprises transmission line 1141 and transmission line 1151, and the two vertically connects and composes step impedance resonator; 4th resonator of described low pass filter 11 comprises transmission line 1142 and transmission line 1152, and the two vertically connects and composes step impedance resonator;
5th resonator of described low pass filter 11 comprises transmission line 1171; The sixth resonator of described low pass filter 11 comprises transmission line 1172, and the first end of transmission line 1171 is connected with the first end of output feeder 1110 is vertical after being connected with the first end straight line of transmission line 1172 respectively;
Described low pass filter 11 also comprises high-impedance transmission line 113 and high-impedance transmission line 116, for six resonators of described low pass filter 11 are interconnected, described high-impedance transmission line 113 is connected with high-impedance transmission line 116 straight line, the first, the 3rd, the 5th resonator of described low pass filter 11 and second, the 4th, sixth resonator line symmetrically structure centered by described high-impedance transmission line 113 and high-impedance transmission line 116.
Further, second end of described transmission line 1111 and transmission line 1112 corresponds to quarter-wave corresponding to described first band pass filter 12 centre frequency to the length of transmission line of the first end of incoming feeder 110, and the second end of described transmission line 1121 and transmission line 1122 corresponds to quarter-wave corresponding to described second band pass filter 13 centre frequency to the length of transmission line of the first end of incoming feeder 110.
Further, corresponding immediately below described high-impedance transmission line 113 and high-impedance transmission line 116 medium substrate etches the first rectangular aperture 118 and the second rectangular aperture 119 of two formed objects.
Further, described first band pass filter 12 comprises incoming feeder 120, output feeder 127 and four resonators, first resonator 121 of wherein said first band pass filter 12 and one end of the 4th resonator 126 are open circuit, the other end is short circuit, short-circuit end is provided with grounding through hole, and the resonator length of described first resonator 121 and the 4th resonator 126 is quarter-wave corresponding to described first band pass filter 12 centre frequency;
Second resonator 122 and the 3rd resonator 124 of wherein said first band pass filter 12 are U-shaped step impedance resonator, the two ends of described U-shaped Stepped Impedance second resonator 122 and the 3rd resonator 124 are all open circuits, the center of the two is connected to loaded transmission line minor matters 123 and the loaded transmission line minor matters 125 of different length, and the resonance frequency of described second resonator 122 and the 3rd resonator 124 is the centre frequency of described first band pass filter 12.
Further, the first end of the corresponding described transmission line 14 of described incoming feeder 120 is to that section of described anchor point p1;
First resonator 121 of described first band pass filter 12 comprises left side transmission line 1211, intermediate conveyor line 1212 and right side transmission line 1213, wherein said intermediate conveyor line 1212 is adjacent and parallel with described incoming feeder 120, the two ends of described intermediate conveyor line 1212 are connected with described left side transmission line 1211 is vertical with right side transmission line 1213 respectively, and described right side transmission line 1213 and described anchor point p1 are positioned on straight line.
Further, described second band pass filter 13 comprises incoming feeder 130, output feeder 135 and four resonators, the resonator length of each resonator is 1/2nd wavelength corresponding to described second band pass filter 13 centre frequency above, and the first resonator 131 of wherein said second band pass filter 13 and the two ends of the 4th resonator 134 are all open circuits;
Second resonator 132 and the 3rd resonator 133 of wherein said second band pass filter 13 are U-shaped resonator, and the two ends of described U-shaped second resonator 132 and the 3rd resonator 133 are all open circuits.
Further, the first end of the corresponding described transmission line 14 of described incoming feeder 130 is to that section of described anchor point p2;
First resonator 131 of described second band pass filter 13 comprises intermediate conveyor line 1311 and right side transmission line 1312, wherein said intermediate conveyor line 1311 is adjacent and parallel with described incoming feeder 130, one end of described intermediate conveyor line 1311 is connected with described right side transmission line 1312 is vertical, and described right side transmission line 1312 and described anchor point p2 are positioned on straight line.
Further, described first band pass filter 12, described second band pass filter 13 and described low pass filter 11 input feed or export feed and adopt tap feed or couple feed.
Further, described transmission line adopts microstrip line, and is the form of straight line or broken line.
The utility model has following advantage and effect relative to prior art:
1) the utility model is by adopting Stepped Impedance minor matters as resonator, and under the prerequisite not affecting pass band performance, its transmission zero produced can more freely control, thus can improve the selectivity of low pass filter.Low pass filter one end adopts minor matters to load resonator simultaneously, the other end adopts uniform impedance minor matters as resonator, can produce multiple transmission zero, can expand the bandwidth of rejection of low pass filter on the one hand, the stopband that can strengthen low pass filter on the other hand suppresses.
2) the utility model is because low pass filter is near the minor matters loading resonator structure of one end employing uniqueness of band pass filter, produce the transmission zero that frequency corresponds to two band pass filter centre frequencies respectively, when making band pass filter be connected by quarter-wave distance with this low pass filter, band pass filter performance can not be affected, thus each lower passband bandpass filter of independent design can be accomplished, finally simply connect again, greatly reduce the design difficulty of triplexer.
3) structure that lower passband disclosed in the utility model leads to triplexer has low insertion loss, the advantage of high selectivity.
4) lower passband disclosed in the utility model leads to triplexer microstrip structure can be adopted to realize, lightweight, cost is low, be applicable to industrial mass manufacture, therefore triplexer possess structure simple, design 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 plane lower passband that the utility model proposes leads to triplexer;
Fig. 4 is the structural representation that the plane lower passband that the utility model proposes leads to low pass filter in triplexer;
Fig. 5 is the structural representation that the plane lower passband that the utility model proposes leads to the first band pass filter in triplexer;
Fig. 6 is the structural representation that the plane lower passband that the utility model proposes leads to the second band pass filter in triplexer;
Fig. 7 is the straight-through effect emulation figure that the plane lower passband that the utility model proposes leads to triplexer;
Fig. 8 is the isolation effect analogous diagram that the plane lower passband that the utility model proposes leads to triplexer.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, clearly, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Embodiment
Refer to Fig. 3, Fig. 3 is the overall structure schematic diagram that plane lower passband disclosed in the utility model embodiment leads to triplexer.Plane lower passband as shown in the figure leads to triplexer, be produced in the manner of a printed circuit board on medium substrate, the same face of described medium substrate is manufactured with respectively the input feeder line head port1 for inputting electromagnetic wave signal, a low pass filter 11 and this low pass filter 11 are for exporting the output feeder line head port2 of electromagnetic wave signal, first band pass filter 12 and this first band pass filter 12 being operated in frequency range 1 is for exporting the output feeder line head port3 of electromagnetic wave signal, second band pass filter 13 and this second band pass filter 13 being operated in frequency range 2 is for exporting the output feeder line head port4 of electromagnetic wave signal, , the transmission line 14 of 50 ohm, the another side of this medium substrate is ground plate.
The first end of transmission line 14 is connected with described input feeder line head port1, and its second end is connected with described low pass filter 11; First band pass filter 13 and the second band pass filter 12 lay respectively at the both sides up and down of described transmission line 14.
Transmission line 14 is provided with three anchor points p1, p2, p3, wherein anchor point p3 the second end being positioned at transmission line 14 as a reference point, the quarter-wave of corresponding first band pass filter 12 centre frequency of anchor point p1 to anchor point p3 distance length, the quarter-wave of corresponding second band pass filter 13 centre frequency of anchor point p2 to anchor point p3 distance difference; Anchor point p1 is for limiting the horizontal range of described first band pass filter 12 to described anchor point p3, and anchor point p2 is for limiting the horizontal range of described second band pass filter 13 to described anchor point p3.Be inverted according to quarter-wave impedance, when band pass filter 12, band pass filter 13 work, p1, p2 place is equivalent to open-circuit condition respectively, low pass filter 11 on its substantially without impact, this design great advantage to accomplish each lower passband bandpass filter of independent design, and it can not be affected mutually, then shorten the design cycle, improve design efficiency.
The structure of low pass filter 11 as shown in Figure 4, comprising for the incoming feeder 110 of feed-in electromagnetic wave signal, to be the matched impedance of 50 ohm for feeding out the output feeder head port2 of electromagnetic wave signal and output feeder 1110, wherein incoming feeder 110 and output feeder 1110.Incoming feeder 110 is a part for described transmission line 14, and the first end of incoming feeder 110 corresponds to the second end of transmission line 14.Definition incoming feeder 110 is first end near that one end of low pass filter 11, that one end away from low pass filter 12 is the second end, transmission line 14 is the second end near that one end of low pass filter 11, and transmission line 14 is first end away from that one end of low pass filter 11.
Low pass filter 11 also comprises six resonators.First resonator of low pass filter 11 comprises transmission line 1111 and transmission line 1121, and the two vertically connects and composes minor matters and loads resonator.Second resonator of low pass filter 11 comprises transmission line 1112 and transmission line 1122, the two vertically connects and composes minor matters and loads resonator, and the first end of transmission line 1111 is connected with the first end of incoming feeder 110 is vertical after being connected with the first end straight line of transmission line 1112 respectively.
3rd resonator of low pass filter 11 comprises transmission line 1141 and transmission line 1151, and the two vertically connects and composes step impedance resonator; 4th resonator of low pass filter 11 comprises transmission line 1142 and transmission line 1152, and the two vertically connects and composes step impedance resonator.
5th resonator of low pass filter 11 comprises transmission line 1171; The sixth resonator of low pass filter 11 comprises transmission line 1172, and the first end of transmission line 1171 is connected with the first end of output feeder 1110 is vertical after being connected with the first end straight line of transmission line 1172 respectively.Low pass filter 11 the 5th, sixth resonator is uniform impedance resonator.
Low pass filter 11 also comprises high-impedance transmission line 113 and high-impedance transmission line 116, for six of low pass filter 11 resonators are interconnected, high-impedance transmission line 113 is connected with high-impedance transmission line 116 straight line, the first, the 3rd, the 5th resonator of low pass filter 11 and second, the 4th, sixth resonator line centered by high-impedance transmission line 113 and high-impedance transmission line 116 is upper and lower symmetrical structure.In order to improve the impedance of connecting line further, optimizing the performance of low-pass filtering, medium substrate corresponding immediately below high-impedance transmission line 113 and high-impedance transmission line 116 etching the first rectangular aperture 118 and the second rectangular aperture 119 of two formed objects.
Transmission line 111 and transmission line 115 have all carried out folded bent, and object is the size in order to reduce low pass filter 11.Especially it is to be noted that, band pass filter 12 is respectively in order to produce two frequencies, the transmission zero of band pass filter 13 centre frequency, second end of transmission line 1111 and transmission line 1112 corresponds to quarter-wave corresponding to described first band pass filter 12 centre frequency to the length of transmission line of the first end of incoming feeder 110, second end of transmission line 1121 and transmission line 1122 corresponds to quarter-wave corresponding to the second band pass filter 13 centre frequency to the length of transmission line of the first end of incoming feeder 110, by gap 118 during actual design, transmission line 1151, transmission line 1152 affects, meeting deviation to some extent, but can be effective by simulated trim optimization.Wherein, transmission line 1111 and transmission line 1112 are called the second end away from one end of incoming feeder, and close one end is called first end, same, transmission line 1121 and transmission line 1122 are called the second end away from one end of incoming feeder, and close one end is called first end.
The structure of the first band pass filter 12 as shown in Figure 5, comprising for the incoming feeder 120 of feed-in electromagnetic wave signal, to be the matched impedance of 50 ohm for feeding out the output feeder head port3 of electromagnetic wave signal and output feeder 127, wherein incoming feeder 120 and output feeder 127.
First band pass filter 12 also comprises four resonators, four resonators are respectively the first resonator 121, second resonator 122, the 3rd resonator 124 and the 4th resonator 126, wherein the resonator length of the first resonator 121 and the 4th resonator 126 is quarter-wave corresponding to this first band pass filter 12 centre frequency, and wherein the resonance frequency of the second resonator 122 and the 3rd resonator 124 is the centre frequency of the first band pass filter 12.
In addition, the first resonator 121 of the first band pass filter 12 and one end of the 4th resonator 126 are open circuit, and the other end is short circuit, and short-circuit end is provided with grounding through hole, reaches short circuit effect.Wherein the first resonator 121 of quarter-wave first band pass filter 12 and the transmission line of the 4th resonator 126 have carried out bending fold, and object is to reduce size.
Second resonator 122 and the 3rd resonator 124 of the first band pass filter 12 are U-shaped step impedance resonator, the two ends of U-shaped Stepped Impedance second resonator 122 and the 3rd resonator 124 are all open circuits, and the center of the two is connected to loaded transmission line minor matters 123 and the loaded transmission line minor matters 125 of different length, object is the transmission zero of accommodation zone bandpass filter 12, make it drop in the passband of band pass filter 13, reach better isolation effect.Output feeder 127 also bends, and is the edge in order to its output port port3 being arranged on dielectric-slab, uses so that actual.
Input feed and the output feed of the first band pass filter 12 all adopt the mode of couple feed to carry out.In incoming feeder 120 and the first band pass filter 12, the intermediate conveyor line 1212 of the first resonator 121 is coupled, and the spacing that incoming feeder 120 is coupled with the first resonator 121 and length can be used for the band internal characteristic of optimization first band pass filter 12.
The first end of the corresponding transmission line of incoming feeder 120 14 is to that section of described anchor point p1; First resonator 121 of the first band pass filter 12 comprises left side transmission line 1211, intermediate conveyor line 1212 and right side transmission line 1213, wherein intermediate conveyor line 1212 is adjacent with incoming feeder 120 and parallel, the two ends of intermediate conveyor line 1212 are vertical with right side transmission line 1213 with left side transmission line 1211 to be respectively connected, and right side transmission line 1312 and anchor point p1 are positioned on straight line.
The structure of the second band pass filter 13 as shown in Figure 6, comprising for the incoming feeder 130 of feed-in electromagnetic wave signal, to be the matched impedance of 50 ohm for feeding out the output feeder head port4 of electromagnetic wave signal and output feeder 135, wherein incoming feeder 130 and output feeder 135.
Second band pass filter also comprises four resonators, the resonator length of each resonator is 1/2nd wavelength corresponding to the second band pass filter 13 centre frequency above, and wherein the first resonator 131 of the second band pass filter 13 and the two ends of the 4th resonator 134 are all open circuits;
Wherein the second resonator 132 of the second band pass filter 13 and the 3rd resonator 133 are U-shaped resonator, and opening is oppositely contrary, and the second U-shaped resonator 132 and the two ends of the 3rd resonator 133 are all open circuits.
Input feed and the output feed of the second band pass filter 13 all adopt the mode of couple feed to carry out.In incoming feeder 130 and the second band pass filter 13, the intermediate conveyor line 1312 of the first resonator 131 is coupled, and the spacing that incoming feeder 130 is coupled with the first resonator 131 and length can be used for the band internal characteristic of optimization second band pass filter 13.
Output feeder 135 also bends, and is the edge in order to its output port port4 being arranged on dielectric-slab, uses so that actual.Four resonators of the second band pass filter all bend, and one of its object is in order to reduced in size.
The first end of the corresponding described transmission line 14 of incoming feeder 130 is to that section of described anchor point p2; First resonator 131 of the second band pass filter 13 comprises intermediate conveyor line 1311 and right side transmission line 1312, wherein intermediate conveyor line 1311 is adjacent with incoming feeder 130 and parallel, one end of intermediate conveyor line 1311 is connected with right side transmission line 1312 is vertical, and right side transmission line 1312 and anchor point p2 are positioned on straight line.
Input feed and the output feed of above first band pass filter 12, second band pass filter 13 and low pass filter 11 adopt tap feed or couple feed, and their bandwidth is determined by the spacing between resonator.The above transmission line adopts microstrip line, and is the form of straight line or broken line.
The logical triplexer integral manufacturing of plane 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 placement distance of the transmission zero of specification low pass filter and three filters thus can accomplishes independent design three filters, and its performance can not influence each other.
The plane lower passband of the present embodiment leads to triplexer, and to be produced on dielectric constant be in the manner of a printed circuit board 2.55, thickness is on the micro-band plate of polytetrafluoroethylene double-sided copper-clad of 0.8mm, detailed construction as shown in Figure 1,2,3, 4, overall dimensions is 75.5mm × 45.2mm, and simulated effect as shown in Figure 5,6.This plane lower passband leads to triplexer superior performance, meets actual operation requirements.
Fig. 5,6 shows plane lower passband and leads to the straight-through effect of triplexer and the simulation result of isolation effect, and transverse axis represents that the utility model midplane lower passband leads to the signal frequency of triplexer, and the longitudinal axis represents signal amplitude, wherein S
11represent the reflection coefficient of looking to port one, S
ij(i ≠ j) shows the transmission coefficient of port j to port i.When signal inputs to certain Single port, the part input power of signal is reflected back toward signal source, is become reflection power by the power reflected.S
11reacted 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|S
11|, and S
ij(i ≠ j) corresponding mathematical function is: power output/input power (dB)=20*log|S
ij|.
Low pass filter-1dB the cut-off frequency that plane lower passband of the present utility model leads in triplexer is 1GHz, and stopband is suppressed over 24dB, and stopband highest frequency is more than 7GHz.Band pass filter 12 centre frequency being operated in frequency range 1 is 2.4GHz, and insertion loss is less than 2dB, and return loss absolute value is greater than 19dB, and three dB bandwidth is 240MHz.Band pass filter 13 centre frequency being operated in frequency range 2 is 5.8GHz, and insertion loss is less than 2.3dB, and return loss absolute value is greater than 15dB, and three dB bandwidth is 400MHz.In 0-7GH frequency, the isolation S of the logical triplexer of plane low pass-band
32absolute value be greater than 48dB, isolation S
42absolute value be greater than 50dB, isolation S
43absolute value be greater than 39dB.This plane lower passband leads to triplexer superior performance, meets actual operation requirements.
Above-described embodiment is the utility model preferably execution mode; but execution mode of the present utility model is not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection range of the present utility model.
Claims (10)
1. plane lower passband leads to a triplexer, is produced on medium substrate in the manner of a printed circuit board, it is characterized in that:
The same face of described medium substrate is manufactured with respectively the input feeder line head port1 for inputting electromagnetic wave signal, low pass filter (11) and its for export electromagnetic wave signal output feeder line head port2, be operated in first band pass filter (12) of frequency range 1 and its for export electromagnetic wave signal output feeder line head port3, be operated in frequency range 2 the second band pass filter (13) and it is for exporting output feeder line head port4, the transmission line (14) of electromagnetic wave signal, the another side of this medium substrate is ground plate;
The first end of described transmission line (14) is connected with described input feeder line head port1, and its second end is connected with described low pass filter (11); Described first band pass filter (12) and the second band pass filter (13) lay respectively at the both sides of described transmission line (14);
Described transmission line (14) is provided with anchor point p1, p2, p3, wherein said anchor point p3 is positioned at the second end of transmission line (14), and described anchor point p1 distinguishes the quarter-wave of corresponding described first band pass filter (12), the second band pass filter (13) centre frequency to described anchor point p3 distance, described anchor point p2 to described anchor point p3 distance;
Described anchor point p1 is for limiting the horizontal range of described first band pass filter (12) to described anchor point p3, and described anchor point p2 is for limiting the horizontal range of described second band pass filter (13) to described anchor point p3.
2. a kind of plane lower passband according to claim 1 leads to triplexer, it is characterized in that: described low pass filter (11) comprises six resonators, incoming feeder (110) and output feeder (1110), the part that described incoming feeder (110) is described transmission line (14), and the first end of described incoming feeder (110) corresponds to the second end of described transmission line (14);
First resonator of described low pass filter (11) comprises transmission line (1111) and transmission line (1121), and the two vertically connects and composes minor matters and loads resonator; Second resonator of described low pass filter (11) comprises transmission line (1112) and transmission line (1122), the two vertically connects and composes minor matters and loads resonator, and the first end of transmission line (1111) is connected with the first end of incoming feeder (110) is vertical after being connected with the first end straight line of transmission line (1112) respectively;
3rd resonator of described low pass filter (11) comprises transmission line (1141) and transmission line (1151), and the two vertically connects and composes step impedance resonator; 4th resonator of described low pass filter (11) comprises transmission line (1142) and transmission line (1152), and the two vertically connects and composes step impedance resonator;
5th resonator of described low pass filter (11) comprises transmission line (1171); The sixth resonator of described low pass filter (11) comprises transmission line (1172), and the first end of transmission line (1171) is connected with the first end of output feeder (1110) is vertical after being connected with the first end straight line of transmission line (1172) respectively;
Described low pass filter (11) also comprises high-impedance transmission line (113) and high-impedance transmission line (116), for six resonators of described low pass filter (11) are interconnected, described high-impedance transmission line (113) is connected with high-impedance transmission line (116) straight line, the first, the 3rd, the 5th resonator of described low pass filter (11) and second, the 4th, sixth resonator line symmetrically structure centered by described high-impedance transmission line (113) and high-impedance transmission line (116).
3. a kind of plane lower passband according to claim 2 leads to triplexer, it is characterized in that: the second end of described transmission line (1111) and transmission line (1112) corresponds to quarter-wave corresponding to described first band pass filter (12) centre frequency to the length of transmission line of the first end of incoming feeder (110), second end of described transmission line (1121) and transmission line (1122) corresponds to quarter-wave corresponding to described second band pass filter (13) centre frequency to the length of transmission line of the first end of incoming feeder (110).
4. a kind of plane lower passband according to claim 2 leads to triplexer, it is characterized in that: the first rectangular aperture (118) and the second rectangular aperture (119) that medium substrate corresponding immediately below described high-impedance transmission line (113) and high-impedance transmission line (116) etch two formed objects.
5. a kind of plane lower passband according to claim 1 leads to triplexer, it is characterized in that: described first band pass filter (12) comprises incoming feeder (120), output feeder (127) and four resonators, first resonator (121) of wherein said first band pass filter (12) and one end of the 4th resonator (126) are open circuit, the other end is short circuit, short-circuit end is provided with grounding through hole, and the resonator length of described first resonator (121) and the 4th resonator (126) is quarter-wave corresponding to described first band pass filter (12) centre frequency,
Second resonator (122) and the 3rd resonator (124) of wherein said first band pass filter (12) are U-shaped step impedance resonator, the two ends of described U-shaped Stepped Impedance second resonator (122) and the 3rd resonator (124) are all open circuits, the center of the two is connected to loaded transmission line minor matters (123) and the loaded transmission line minor matters (125) of different length, and the resonance frequency of described second resonator (122) and the 3rd resonator (124) is the centre frequency of described first band pass filter (12).
6. a kind of plane lower passband according to claim 5 leads to triplexer, it is characterized in that: the first end of the corresponding described transmission line of described incoming feeder (120) (14) is to that section of described anchor point p1;
First resonator (121) of described first band pass filter (12) comprises left side transmission line (1211), intermediate conveyor line (1212) and right side transmission line (1213), wherein said intermediate conveyor line (1212) is adjacent and parallel with described incoming feeder (120), the two ends of described intermediate conveyor line (1212) are vertical with right side transmission line (1213) with described left side transmission line (1211) to be respectively connected, and described right side transmission line (1213) and described anchor point p1 are positioned on straight line.
7. a kind of plane lower passband according to claim 1 leads to triplexer, it is characterized in that: described second band pass filter (13) comprises incoming feeder (130), output feeder (135) and four resonators, the resonator length of each resonator is 1/2nd wavelength corresponding to described second band pass filter (13) centre frequency above, and first resonator (131) of wherein said second band pass filter (13) and the two ends of the 4th resonator (134) are all open circuits;
Second resonator (132) and the 3rd resonator (133) of wherein said second band pass filter (13) are U-shaped resonator, and the two ends of described U-shaped second resonator (132) and the 3rd resonator (133) are all open circuits.
8. a kind of plane lower passband according to claim 7 leads to triplexer, it is characterized in that: the first end of the corresponding described transmission line of described incoming feeder (130) (14) is to that section of described anchor point p2;
First resonator (131) of described second band pass filter (13) comprises intermediate conveyor line (1311) and right side transmission line (1312), wherein said intermediate conveyor line (1311) is adjacent and parallel with described incoming feeder (130), one end of described intermediate conveyor line (1311) is connected with described right side transmission line (1312) is vertical, and described right side transmission line (1312) and described anchor point p2 are positioned on straight line.
9. a kind of plane lower passband according to claim 1 leads to triplexer, it is characterized in that: the input feed of described first band pass filter (12), described second band pass filter (13) and described low pass filter (11) or export feed and adopt tap feed or couple feed.
10. lead to triplexer according to the arbitrary described a kind of plane lower passband of claim 1 to 9, it is characterized in that: described transmission line adopts microstrip line, and is the form of straight line or broken line.
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| CN201520009361.2U CN204375881U (en) | 2015-01-04 | 2015-01-04 | Plane lower passband leads to triplexer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577268A (en) * | 2015-01-04 | 2015-04-29 | 华南理工大学 | Planar lowpass-bandpass triplexer |
| CN105489980A (en) * | 2015-12-18 | 2016-04-13 | 华南理工大学 | High-isolation low-pass and band-pass triplexer |
| WO2021164198A1 (en) * | 2020-02-19 | 2021-08-26 | 中天通信技术有限公司 | Microstrip low-pass filter |
-
2015
- 2015-01-04 CN CN201520009361.2U patent/CN204375881U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577268A (en) * | 2015-01-04 | 2015-04-29 | 华南理工大学 | Planar lowpass-bandpass triplexer |
| CN104577268B (en) * | 2015-01-04 | 2017-06-06 | 华南理工大学 | Plane low pass band logical triplexer |
| CN105489980A (en) * | 2015-12-18 | 2016-04-13 | 华南理工大学 | High-isolation low-pass and band-pass triplexer |
| WO2021164198A1 (en) * | 2020-02-19 | 2021-08-26 | 中天通信技术有限公司 | Microstrip low-pass filter |
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