CN104577268B - Plane low pass band logical triplexer - Google Patents
Plane low pass band logical triplexer Download PDFInfo
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- CN104577268B CN104577268B CN201510007058.3A CN201510007058A CN104577268B CN 104577268 B CN104577268 B CN 104577268B CN 201510007058 A CN201510007058 A CN 201510007058A CN 104577268 B CN104577268 B CN 104577268B
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Abstract
The present invention discloses a kind of plane low pass band logical triplexer, including low pass filter (11), two bandpass filters (12), (13) and the first transmission lines (14), two minor matters loading resonator of wherein low pass filter (11) produces two frequencies to be respectively the transmission zero of bandpass filter (12) and (13) centre frequency, makes it be short-circuit condition in two center frequency signals of bandpass filter of input end of low pass filter (11)；First transmission line (14) is provided with anchor point p1, p2, p3, wherein p1 to p3 distances, p2 to p3 distances correspond to the quarter-wave of bandpass filter centre frequency respectively, it is inverted according to quarter-wave impedance, bandpass filter (12) is respectively open-circuit condition with the center frequency signal of (13) in p1, p2, the triplexer facilitates independent design each low pass bandpass filter, it is independent of each other, the design cycle can be shortened and design efficiency is improved.
Description
Technical field
The present invention relates to the technical field of flat filter, more particularly to a kind of plane low pass band logical triplexer.
Background technology
In recent years, wireless communication technology is developed rapidly, and people increasingly increase the demand of radio communication service, in order to meet
The various demands of people, communication system will compatible various communication standards in design.Wireless communication system of today, is substantially
The system of multiplexing, for time multiplex, as long as will receive with send out be arranged in different timeslices just can with solve problem, and for
Frequency Division Multiplex, in order to the quantity for reducing filtering device then needs the special device of design to isolate different signals without mutual coupling
Interference is played, such device is exactly multiplexer.
At present, the multiplexer for being combined by bandpass filter designs comparative maturity, but by low pass filter and band
Method is simultaneously few in design for the multiplexer that bandpass filter is combined, can each wave filter of independent design and energy simple combination
Method together is even more few.Due to microstrip structure design easy to process, low cost, performance meets actual requirement, and
And be planar structure, it is easy to the design of plane low pass-band logical multiplexer integrated with other components therefore excellent is in recent years
Study hotspot.
1999, M.H.Capstisk delivered entitled " Microstrip on " IEEE Electronic Letter "
The paper of lowpass-bandpass diplexer topology ", structure is illustrated in fig. 1 shown below, and it is simply by a low pass
Wave filter connects with a bandpass filter, forms a low pass-band logical duplexer, and this article illustrates there is deficient detailed, it is difficult to accomplish
Low pass bandpass filter independent design.
2013, Pu-Hua Deng et al. existed " IEEE MICROWAVE AND WIRELESS COMPONENTS
The paper of LETTERS " on deliver entitled " Design of Microstrip Lowpass-Bandpass Diplexer ", structure
It is illustrated in fig. 2 shown below, low pass filter is attached with bandpass filter by quarter-wave transformer, composition one is low
Logical-band logical duplexer, although its low pass bandpass filter can be with independent design, but the structure cannot be applied to low pass-band logical three
Work device is designed, and its low pass filter performance is to be improved.
The content of the invention
Shortcoming and deficiency it is an object of the invention to overcome prior art, there is provided a kind of plane low pass band logical triplexer,
The design is improved to the branch that open circuit minor matters are loaded by the minor matters to low pass filter input by traditional uniform impedance minor matters
Section, produces two to correspond to two transmission zeros of bandpass filter centre frequency, therefore low pass filter input end two respectively
The corresponding center frequency signal of individual bandpass filter is all short-circuit condition, and is inverted according to quarter-wave impedance, apart from low
It is open-circuit condition at bandpass filter input centre frequency corresponding wavelength a quarter, therefore, if terminating one respectively at two at this
Individual bandpass filter, can accomplish three wave filter independent designs without influencing each other.
The purpose of the present invention is achieved through the following technical solutions：
A kind of plane low pass band logical triplexer, is produced on medium substrate in the manner of a printed circuit board, the medium base
On the same face of plate respectively make have for be input into the input feeder line head port1 of electromagnetic wave signal, low pass filter 11 and its
For export electromagnetic wave signal output end feeder line head port2, be operated in frequency range 1 the first bandpass filter 12 and its be used for it is defeated
The output end feeder line head port3 that goes out electromagnetic wave signal, the second bandpass filter 13 for being operated in frequency range 2 and its be used to export electromagnetism
The output end feeder line head port4 of ripple signal, the first transmission line 14, the another side of the medium substrate is earth plate；
The first end of first transmission line 14 is connected with the input feeder line head port1, and its second end is low with described
Bandpass filter 11 is connected；Part and second band logical of first bandpass filter 12 in addition to the second incoming feeder 120
Part of the wave filter 13 in addition to the 3rd incoming feeder 130 is respectively positioned at the both sides of the transmission line 14；
First transmission line 14 is provided with anchor point p1, p2, p3, wherein the anchor point p3 is located at the first transmission line 14
The second end, the anchor point p1 to anchor point p3 distances, the anchor point p2 to the anchor point p3 are apart from right respectively
Answer first bandpass filter 12, the quarter-wave of the centre frequency of the second bandpass filter 13；
The anchor point p1 is used to limit first bandpass filter 12 to the horizontal range of the anchor point p3, described
Anchor point p2 is used to limit second bandpass filter 13 to the horizontal range of the anchor point p3.
Further, the low pass filter 11 includes six resonators, the first incoming feeder 110 and the first output feeders
1110, first incoming feeder 110 is a part for first transmission line 14, and first incoming feeder 110
First end corresponds to the second end of first transmission line 14；
First resonator of the low pass filter 11 includes the transmission line 1121 of transmission line 1111 and the 4th, and the two is mutually put down
Row its each other first end straight line connect and compose minor matters loading resonator；Second resonator of the low pass filter 11 includes transmission
The transmission line 1122 of line 1112 and the 5th, the two be parallel to each other its each other first end straight line connect and compose minor matters loading resonator, and
And respectively with the first of the first incoming feeder 110 after the first end straight line connection of the first end and transmission line 1112 of transmission line 1111
The vertical connection in end；
3rd resonator of the low pass filter 11 includes the 6th transmission line 1141 and the 7th transmission line 1151, and the two hangs down
Directly connect and compose step impedance resonator；4th resonator of the low pass filter 11 includes the 8th transmission line 1142 and the 9th
Transmission line 1152, the two vertically connects and composes step impedance resonator；
5th resonator of the low pass filter 11 includes transmission line 1171；6th resonance of the low pass filter 11
Device is included after transmission line 1172, and the first end straight line connection of the first end and transmission line 1172 of transmission line 1171 respectively with the
The first end of one output feeder 1110 is vertically connected；
The low pass filter 11 also includes the first high-impedance transmission line 113 and high-impedance transmission line 116, for by described in
Six resonators interconnection of low pass filter 11, first high-impedance transmission line 113 and the straight line of high-impedance transmission line 116
Connection, first, the three, the 5th resonators of the low pass filter 11 are with second, the 4th, sixth resonator it is high with described first
Line is in symmetrical structure centered on impedance transmission lines 113 and high-impedance transmission line 116.
Further, the second end of the transmission line 1111 and transmission line 1112 to the first incoming feeder 110 first
The length of transmission line at end corresponds to the corresponding quarter-wave of the centre frequency of the first bandpass filter 12, and the described 4th passes
The length of transmission line of the first end at second end to the first incoming feeder 110 of the transmission line 1122 of defeated line 1121 and the 5th is corresponded to
The corresponding quarter-wave of the centre frequency of second bandpass filter 13.
Further, the corresponding medium substrate of first high-impedance transmission line 113 and the underface of high-impedance transmission line 116
On etch two first rectangular apertures 118 and the second rectangular aperture 119 of formed objects.
Further, first bandpass filter 12 includes the second incoming feeder 120, the second output feeder 127 and four
Individual resonator, wherein one end of the first resonator 121 of the first band bandpass filter 12 and the 4th resonator 126 is open circuit,
The other end is short circuit, and short-circuit end is provided with grounding through hole, and the resonator 126 of first resonator 121 and the 4th resonator
Length is the corresponding quarter-wave of the centre frequency of the first bandpass filter 12；
Second resonator 122 of wherein described first band bandpass filter 12 and the 3rd resonator 124 are that U-shaped Stepped Impedance is humorous
Shake device, and the two ends of U-shaped Stepped Impedance second resonator 122 and the 3rd resonator 124 are open circuits, the center punishment of the two
It is not connected with the first loaded transmission line minor matters 123 and the second loaded transmission line minor matters 125 of different length, and it is described second humorous
Shake the resonator 124 of device 122 and the 3rd resonant frequency be first bandpass filter 12 centre frequency.
Further, the first end of second incoming feeder 120 correspondence, first transmission line 14 is to the anchor point
That section of p1；
First resonator 121 of first bandpass filter 12 includes being passed in the middle of the first left side transmission line 1211, first
The right side transmission line 1213 of defeated line 1212 and first, wherein the first intermediate conveyor line 1212 and second incoming feeder 120
Adjacent and parallel, the two ends of the first intermediate conveyor line 1212 are right with first left side transmission line 1211 and first respectively
Side transmission line 1213 is vertically connected, and first right side transmission line 1213 is located at a vertical straight line with the anchor point p1
On.
Further, second bandpass filter 13 includes the 3rd incoming feeder 130, the 3rd output feeder 135 and four
Individual resonator, it is corresponding two points that the resonator length of the above each resonator is the centre frequency of the second bandpass filter 13
One of wavelength, wherein the two ends of the first resonator 131 of second bandpass filter 13 and the 4th resonator 134 are opened
Road；
Second resonator 132 of wherein described second bandpass filter 13 and the 3rd resonator 133 are U-shaped resonator, institute
The two ends for stating the resonator 133 of U-shaped second resonator 132 and the 3rd are open circuits.
Further, the first end of the 3rd incoming feeder 130 correspondence first transmission line 14 is to the anchor point
That section of p2；
First resonator 131 of second bandpass filter 13 includes that the first intermediate conveyor line 1311 and the first right side pass
Defeated line 1312, wherein the first intermediate conveyor line 1311 is adjacent and parallel with the 3rd incoming feeder 130, described first
One end of intermediate conveyor line 1311 is vertical with first right side transmission line 1312 to be connected, and first right side transmission line
1312 are located in a vertical straight line with the anchor point p2.
Further, first bandpass filter 12, second bandpass filter 13 and the low pass filter 11
Input feed or output feed use tap feed or couple feed.
Further, the transmission line uses microstrip line, and is straight line or the form of broken line.
The present invention has the following advantages and effect relative to prior art：
1) present invention is used as resonator by using Stepped Impedance minor matters, before pass band performance is not influenceed
Put, its transmission zero for producing can be controlled more freely, such that it is able to improve the selectivity of low pass filter.It is simultaneously low
Bandpass filter one end loads resonator using minor matters, and the other end, as resonator, can produce multiple using uniform impedance minor matters
Transmission zero, on the one hand can expand the bandwidth of rejection of low pass filter, on the other hand can strengthen the stopband of low pass filter
Suppress.
2) present invention uses the minor matters loading resonator knot of uniqueness due to low pass filter against one end of bandpass filter
Structure, produces frequency to correspond to two transmission zeros of bandpass filter centre frequency respectively so that bandpass filter is low with this
When bandpass filter is attached over long distances by quarter-wave, bandpass filter performance is unaffected, such that it is able to accomplish
Independent design each low pass bandpass filter, is finally simply connected again, substantially reduces the design difficulty of triplexer.
3) structure of low pass band logical triplexer disclosed by the invention has low insertion loss, the advantage of high selectivity.
4) low pass band logical triplexer disclosed by the invention can be realized using microstrip structure, lightweight, low cost, be adapted to work
Industry is produced in batches, therefore triplexer possesses simple structure, designs advantage easy, cheap for manufacturing cost.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the duplexer disclosed in prior art 1；
Fig. 2 is a kind of structural representation of the duplexer disclosed in prior art 2；
Fig. 3 is the overall structure diagram of plane low pass band logical triplexer proposed by the present invention；
Fig. 4 is the structural representation of low pass filter in plane low pass band logical triplexer proposed by the present invention；
Fig. 5 is the structural representation of the first bandpass filter in plane low pass band logical triplexer proposed by the present invention；
Fig. 6 is the structural representation of the second bandpass filter in plane low pass band logical triplexer proposed by the present invention；
Fig. 7 is the straight-through effect emulation figure of plane low pass band logical triplexer proposed by the present invention；
Fig. 8 is the isolation effect analogous diagram of plane low pass band logical triplexer proposed by the present invention.
Specific embodiment
To make the objects, technical solutions and advantages of the present invention clearer, clear and definite, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and without
It is of the invention in limiting.
Embodiment
Fig. 3 is referred to, Fig. 3 is that the overall structure of the plane low pass band logical triplexer disclosed in the embodiment of the present invention is illustrated
Figure.Plane low pass band logical triplexer as depicted, is produced on medium substrate, the medium base in the manner of a printed circuit board
Input feeder line head port1, the low pass filter 11 having for being input into electromagnetic wave signal are made on the same face of plate respectively
With output end feeder line head port2, the first band for being operated in frequency range 1 that the low pass filter 11 is used to export electromagnetic wave signal
Bandpass filter 12 and first bandpass filter 12 are used to export the output end feeder line head port3 of electromagnetic wave signal, a job
It is used to export the output end feeder line head of electromagnetic wave signal in the second bandpass filter 13 of frequency range 2 and second bandpass filter 13
Port4, one 50 ohm of the first transmission line 14, the another side of the medium substrate is earth plate.
The first end of the first transmission line 14 is connected with the input feeder line head port1, its second end and the low pass filtered
Ripple device 11 is connected.Part of first bandpass filter 12 in addition to the second incoming feeder 120 and the second bandpass filter 13 are except the
Part outside three incoming feeders 130 is respectively positioned at the both sides of transmission line 14.
First transmission line 14 is provided with three anchor points p1, p2, p3, and wherein anchor point p3 is as a reference point to be located at the first biography
Second end of defeated line 14, anchor point p1 to anchor point p3 apart from length correspondence the first bandpass filter 12 centre frequency four/
One wavelength, anchor point p2 to anchor point p3 distances correspond to the quarter-wave of the centre frequency of the second bandpass filter 13 respectively；
Anchor point p1 is used to limit first bandpass filter 12 to the horizontal range of the anchor point p3, and anchor point p2 is used to limit
Horizontal range of second bandpass filter 13 to the anchor point p3.It is inverted according to quarter-wave impedance, band logical filter
When ripple device 12, bandpass filter 13 work, open-circuit condition is respectively equivalent at p1, p2, low pass filter 11 is to it substantially without shadow
Ring, the design great advantage can be to accomplish independent design each low pass bandpass filter, and it is mutually unaffected, after
And shorten the design cycle, improve design efficiency.
The structure of low pass filter 11 as shown in Figure 4, including for the first incoming feeder of feed-in electromagnetic wave signal
110th, for feeding out the output feeder head port2 and the first output feeder 1110 of electromagnetic wave signal, wherein the first incoming feeder 110
With the matching impedance that the first output feeder 1110 is 50 ohm.First incoming feeder 110 is the one of first transmission line 14
Part, and the first end of the first incoming feeder 110 corresponds to the second end of the first transmission line 14.Define the first incoming feeder
110 is first end near that one end of low pass filter 11, and that one end away from low pass filter 12 is the second end, the first transmission
Line 14 is the second end near that one end of low pass filter 11, and the first transmission line 14 is the away from that one end of low pass filter 11
One end.
Low pass filter 11 also includes six resonators.First resonator of low pass filter 11 includes the He of transmission line 1111
4th transmission line 1121, the two be parallel to each other its each other first end straight line connect and compose minor matters loading resonator.Low pass filter
11 the second resonator includes the transmission line 1122 of transmission line 1112 and the 5th, the two its first end straight line connection each other that is parallel to each other
Constitute minor matters loading resonator, and transmission line 1111 first end and transmission line 1112 first end straight line connection after respectively with
The first end of the first incoming feeder 110 is vertically connected.
3rd resonator of low pass filter 11 includes the 6th transmission line 1141 and the 7th transmission line 1151, and the two vertically connects
Connect composition step impedance resonator；4th resonator of low pass filter 11 includes the 8th transmission line 1142 and the 9th transmission line
1152, the two vertically connects and composes step impedance resonator.
5th resonator of low pass filter 11 includes transmission line 1171；The sixth resonator of low pass filter 11 includes passing
Presented with the first output respectively after defeated line 1172, and the first end straight line connection of the first end and transmission line 1172 of transmission line 1171
The first end of line 1110 is vertically connected.Low pass filter 11 the 5th, sixth resonator be uniform impedance resonator.
Low pass filter 11 also includes the first high-impedance transmission line 113 and high-impedance transmission line 116, for by LPF
Six resonators of device 11 are connected with each other, and the first high-impedance transmission line 113 and the straight line of high-impedance transmission line 116 are connected, low pass filtered
First, the three, the 5th resonators of ripple device 11 and second, the 4th, sixth resonator is with the first high-impedance transmission line 113 and high resistant
Line is in upper and lower symmetrical structure centered on anti-transmission line 116.In order to further improve the impedance of connecting line, optimize the property of LPF
Can, the first high-impedance transmission line 113 is identical with etching two on corresponding medium substrate immediately below high-impedance transmission line 116 greatly
Small the first rectangular aperture 118 and the second rectangular aperture 119.
Transmission line 111 and transmission line 115 have all carried out folded bent, in order to reduce the chi of low pass filter 11
It is very little.Especially it is noted that transmission in order to produce two frequencies respectively bandpass filter 12, centre frequency of bandpass filter 13
Length of transmission line pair of second end of zero point, transmission line 1111 and transmission line 1112 to the first end of the first incoming feeder 110
Should be the corresponding quarter-wave of the centre frequency of the first bandpass filter 12, the 4th transmission line 1121 and the 5th transmission
Second end of line 1122 corresponds to the center of the second bandpass filter 13 to the length of transmission line of the first end of the first incoming feeder 110
The corresponding quarter-wave of frequency, is influenceed during actual design by gap 118, the 7th transmission line 1151, the 9th transmission line 1152,
Understand deviation, but effect can be reached by simulated trim optimization.Wherein, transmission line 1111 and transmission line 1112 are away from defeated
The one end for entering feeder line is referred to as the second end, and close one end is referred to as first end, likewise, the 4th transmission line 1121 and the 5th transmission
Line 1122 is referred to as the second end away from one end of incoming feeder, and close one end is referred to as first end.
The structure of the first bandpass filter 12 is input into feedback as shown in Figure 5, including for the second of feed-in electromagnetic wave signal
Line 120, the output feeder head port3 for feeding out electromagnetic wave signal and the second output feeder 127, wherein the second incoming feeder
120 and second output feeder 127 be 50 ohm of matching impedance.
First bandpass filter 12 also includes four resonators, and it is humorous that four resonators are respectively the first resonator 121, second
Shake device 122, the 3rd resonator 124 and the 4th resonator 126, wherein the resonator of the first resonator 121 and the 4th resonator 126
Length is the corresponding quarter-wave of the centre frequency of the first bandpass filter 12, wherein the second resonator 122 and the 3rd
The resonant frequency of resonator 124 is the centre frequency of the first bandpass filter 12.
In addition, one end of the first resonator 121 of the first bandpass filter 12 and the 4th resonator 126 is open circuit, it is another
It is short circuit to hold, and short-circuit end is provided with grounding through hole, reaches short-circuit effect.Wherein the of the first bandpass filter of quarter-wave 12
The transmission line of one resonator 121 and the 4th resonator 126 has carried out bending fold, in order to reduce size.
Second resonator 122 of the first bandpass filter 12 and the 3rd resonator 124 are U-shaped step impedance resonator, U-shaped
The two ends of Stepped Impedance the second resonator 122 and the 3rd resonator 124 are to open a way, and the center of the two is connected to
The first loaded transmission line minor matters 123 and the second loaded transmission line minor matters 125 of different length, it is therefore an objective to adjust bandpass filter 12
Transmission zero, it is fallen in the passband of bandpass filter 13, reach more preferable isolation effect.Second output feeder 127
Bent, be in order to output it the edge that port port3 is arranged on dielectric-slab, so as to actually used.
The input feed and output feed of the first bandpass filter 12 are carried out all by the way of couple feed.Second is defeated
Enter feeder line 120 to be coupled with the first intermediate conveyor line 1212 of the first resonator 121 in the first bandpass filter 12, the second input
The spacing and length that feeder line 120 is coupled with the first resonator 121 may serve to optimize the interior spy of band of the first bandpass filter 12
Property.
That section of the first end of the first transmission line 14 of correspondence of the second incoming feeder 120 to the anchor point p1；First band logical
First resonator 121 of wave filter 12 includes that the first left side transmission line 1211, the first intermediate conveyor line 1212 and the first right side pass
Defeated line 1213, wherein the first intermediate conveyor line 1212 is adjacent and parallel with the second incoming feeder 120, the first intermediate conveyor line
1212 two ends respectively with the first left side transmission line 1211 and the first right side transmission line 1213 is vertical is connected, and the first right side passes
Defeated line 1312 is located in a vertical straight line with anchor point p1.
The structure of the second bandpass filter 13 is input into feedback as shown in Figure 6, including for the 3rd of feed-in electromagnetic wave signal
Line 130, output feeder head port4 and the 3rd output feeder 135, wherein the 3rd incoming feeder for feeding out electromagnetic wave signal
130 and the 3rd output feeder 135 be 50 ohm of matching impedance.
Second bandpass filter also includes four resonators, and the resonator length of the above each resonator is the second band logical
Corresponding 1/2nd wavelength of the centre frequency of wave filter 13, wherein the first resonator 131 and the 4th of the second bandpass filter 13
The two ends of resonator 134 are open circuits；
Second resonator 132 of wherein the second bandpass filter 13 and the 3rd resonator 133 are U-shaped resonator, and are opened
Mouth is reversely conversely, the second U-shaped resonator 132 and the two ends of the 3rd resonator 133 are open circuits.
The input feed and output feed of the second bandpass filter 13 are carried out all by the way of couple feed.3rd is defeated
Enter feeder line 130 to be coupled with the intermediate conveyor line 1312 of the first resonator 131 in the second bandpass filter 13, the 3rd incoming feeder
130 spacing coupled with the first resonator 131 and length may serve to optimize the band internal characteristic of the second bandpass filter 13.
3rd output feeder 135 has been also carried out bending, is to output it the edge that port port4 is arranged on dielectric-slab
Place, so as to actually used.Four resonators of the second bandpass filter are bent, and its first purpose is to reduce chi
It is very little.
That section of the first end of the correspondence of the 3rd incoming feeder 130 first transmission line 14 to the anchor point p2；Second
First resonator 131 of bandpass filter 13 includes the first intermediate conveyor line 1311 and the first right side transmission line 1312, wherein the
One intermediate conveyor line 1311 is adjacent and parallel with the 3rd incoming feeder 130, one end and first of the first intermediate conveyor line 1311
Right side transmission line 1312 is vertically connected, and the first right side transmission line 1312 is located in a vertical straight line with anchor point p2.
The input feed of the above the first bandpass filter 12, the second bandpass filter 13 and low pass filter 11 and output feedback
Electricity uses tap feed or couple feed, and their bandwidth to be determined by the spacing between resonator.The above transmission
Line uses microstrip line, and is straight line or the form of broken line.
Plane low pass-band logical triplexer integral manufacturing is scribed, laser incising on the medium substrate of double-sided copper-clad using machinery
The technologies such as system, circuit board corrosion can easily make.Core content of the invention is the transmission zero of specification low pass filter
Point and three placement distances of wave filter are such that it is able to accomplish three wave filters of independent design, and its performance will not mutual shadow
Ring.
It is 2.55 that the plane low pass band logical triplexer of the present embodiment is produced on dielectric constant in the manner of a printed circuit board, thick
Spend on the polytetrafluoroethylene (PTFE) double-sided copper-clad micro-strip plate for 0.8mm, as shown in Figure 1,2,3, 4, overall dimensions are detailed construction
75.5mm × 45.2mm, simulated effect is as shown in Figure 5,6.The plane low pass band logical triplexer superior performance, meets actually used
It is required that.
Fig. 5,6 show the straight-through effect of plane low pass band logical triplexer and the simulation result of isolation effect, and transverse axis is represented
The signal frequency of midplane low pass band logical triplexer of the present invention, the longitudinal axis represents signal amplitude, wherein S11Represent what is looked to port 1
Reflectance factor, Sij(i ≠ j) shows port j to the transmission coefficient of port i.When signal is input into certain Single port, the part of signal
Input power is reflected back toward signal source, and the power for being reflected turns into reflection power.S11The input power and signal of signal are reacted
Reflection power between relation, its corresponding mathematical function is as follows：Reflection power/incident power=20*log | S11|, and Sij
(i ≠ j) mathematical function is accordingly：Power output/input power (dB)=20*log | Sij|。
Low pass filter -1dB cut-off frequencies in plane low pass band logical triplexer of the invention are 1GHz, and stopband suppresses super
24dB is crossed, stopband highest frequency is more than 7GHz.The centre frequency of bandpass filter 12 of frequency range 1 is operated in for 2.4GHz, insertion is damaged
Consumption is less than 2dB, and return loss absolute value is more than 19dB, and three dB bandwidth is 240MHz.It is operated in the bandpass filter 13 of frequency range 2
Frequency of heart is 5.8GHz, and insertion loss is less than 2.3dB, and return loss absolute value is more than 15dB, and three dB bandwidth is 400MHz.In 0-
In 7GH frequencies, the isolation S of plane low pass-band logical triplexer32Absolute value be more than 48dB, isolation S42Absolute value be more than
50dB, isolation S43Absolute value be more than 39dB.The plane low pass band logical triplexer superior performance, meets actual operation requirements.
Above-described embodiment is the present invention preferably implementation method, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from Spirit Essence of the invention and the change, modification, replacement made under principle, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (10)
1. a kind of plane low pass band logical triplexer, is produced on medium substrate in the manner of a printed circuit board, it is characterised in that：
Being made respectively on the same face of the medium substrate has for being input into the input feeder line head port1 of electromagnetic wave signal, low
Bandpass filter (11) and its be used to exporting the output end feeder line head port2 of electromagnetic wave signal, be operated in the first band logical filter of frequency range 1
Ripple device (12) and its be used to export the output end feeder line head port3 of electromagnetic wave signal, be operated in the second bandpass filter of frequency range 2
(13) and its output end feeder line head port4, first transmission line (14) for being used to export electromagnetic wave signal, the medium substrate is another
Face is earth plate；
The first end of first transmission line (14) is connected with the input feeder line head port1, its second end and the low pass
Wave filter (11) is connected；Part and described second of first bandpass filter (12) in addition to the second incoming feeder (120)
Part of the bandpass filter (13) in addition to the 3rd incoming feeder (130) is respectively positioned at the both sides of the transmission line (14)；
First transmission line (14) is provided with anchor point p1, p2, p3, wherein the anchor point p3 is located at the first transmission line (14)
The second end, the anchor point p1 to anchor point p3 distances, the anchor point p2 to the anchor point p3 are apart from right respectively
Answer first bandpass filter (12), the quarter-wave of the second bandpass filter (13) centre frequency；
The anchor point p1 is used to limit first bandpass filter (12) to the horizontal range of the anchor point p3, described fixed
Site p2 is used to limit second bandpass filter (13) to the horizontal range of the anchor point p3.
2. a kind of plane low pass band logical triplexer according to claim 1, it is characterised in that：The low pass filter (11)
Including six resonators, the first incoming feeder (110) and the first output feeder (1110), first incoming feeder (110) is
A part for first transmission line (14), and the first end of first incoming feeder (110) corresponds to first biography
Second end of defeated line (14)；
First resonator of the low pass filter (11) includes the second transmission line (1111) and the 4th transmission line (1121), the two
Be parallel to each other its each other first end straight line connect and compose minor matters loading resonator；Second resonator of the low pass filter (11)
Including the 3rd transmission line (1112) and the 5th transmission line (1122), the two be parallel to each other its each other first end straight line connect and compose branch
Section loading resonator, and after the first end straight line connection of the first end of the second transmission line (1111) and the 3rd transmission line (1112)
It is vertical with the first end of the first incoming feeder (110) respectively to be connected；
3rd resonator of the low pass filter (11) includes the 6th transmission line (1141) and the 7th transmission line (1151), the two
Vertically connect and compose step impedance resonator；4th resonator of the low pass filter (11) includes the 8th transmission line (1142)
With the 9th transmission line (1152), the two vertically connects and composes step impedance resonator；
5th resonator of the low pass filter (11) includes the tenth transmission line (1171)；The of the low pass filter (11)
Six resonators include the 11st transmission line (1172), and the tenth transmission line (1171) first end and the 11st transmission line
(1172) it is vertical with the first end of output feeder (1110) respectively after first end straight line connection to be connected；
The low pass filter (11) also includes the first high-impedance transmission line (113) and the second high-impedance transmission line (116), is used for
Six resonators of the low pass filter (11) are connected with each other, first high-impedance transmission line (113) and the second high resistant
The connection of anti-transmission line (116) straight line, the first, the 3rd, the 5th resonator of the low pass filter (11) and second, the 4th, the
Six resonators line centered on first high-impedance transmission line (113) and the second high-impedance transmission line (116) is in symmetrical structure.
3. a kind of plane low pass band logical triplexer according to claim 2, it is characterised in that：Second transmission line
(1111) and the 3rd transmission line (1112) the second end to the first incoming feeder (110) first end length of transmission line correspondence
It is the corresponding quarter-wave of the first bandpass filter (12) centre frequency, the 4th transmission line (1121) and
Second end of five transmission lines (1122) corresponds to second band to the length of transmission line of the first end of the first incoming feeder (110)
The corresponding quarter-wave of bandpass filter (13) centre frequency.
4. a kind of plane low pass band logical triplexer according to claim 2, it is characterised in that：The first high impedance transmission
Immediately below line (113) and the second high-impedance transmission line (116) two the first of formed objects are etched on corresponding medium substrate
Rectangular aperture (118) and the second rectangular aperture (119).
5. a kind of plane low pass band logical triplexer according to claim 1, it is characterised in that：First bandpass filter
(12) including the second incoming feeder (120), the second output feeder (127) and four resonators, wherein the first band pass filter
First resonator (121) of device (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, and the resonator length of first resonator (121) and the 4th resonator (126) is first band logical
The corresponding quarter-wave of wave filter (12) centre frequency；
Second resonator (122) and the 3rd resonator (124) of wherein described first band bandpass filter (12) are U-shaped Stepped Impedance
The two ends of resonator, the resonator of U-shaped Stepped Impedance second (122) and the 3rd resonator (124) are open circuits, in the two
The first loaded transmission line minor matters (123) and the second loaded transmission line minor matters (125) of different length are connected at the heart, and
The resonant frequency of second resonator (122) and the 3rd resonator (124) is the center of first bandpass filter (12)
Frequency.
6. a kind of plane low pass band logical triplexer according to claim 5, it is characterised in that：Second incoming feeder
(120) that section of the first end of correspondence first transmission line (14) to the anchor point p1；
First resonator (121) of first bandpass filter (12) including the first left side transmission line (1211), first in the middle of
Transmission line (1212) and the first right side transmission line (1213), wherein the first intermediate conveyor line (1212) and the described second input
Feeder line (120) is adjacent and parallel, the two ends of the first intermediate conveyor line (1212) respectively with first left side transmission line
(1211) vertically connected with the first right side transmission line (1213), and first right side transmission line (1213) and the anchor point
P1 is located in a vertical straight line.
7. a kind of plane low pass band logical triplexer according to claim 1, it is characterised in that：Second bandpass filter
(13) including the 3rd incoming feeder (130), the 3rd output feeder (135) and four resonators, the resonance of the above each resonator
Device length is corresponding 1/2nd wavelength of the second bandpass filter (13) centre frequency, wherein second band logical is filtered
First resonator (131) of ripple device (13) and the two ends of the 4th resonator (134) are open circuits；
Second resonator (132) and the 3rd resonator (133) of wherein described second bandpass filter (13) are U-shaped resonator,
The two ends of U-shaped second resonator (132) and the 3rd resonator (133) are open circuits.
8. a kind of plane low pass band logical triplexer according to claim 7, it is characterised in that：3rd incoming feeder
(130) that section of the first end of correspondence first transmission line (14) to the anchor point p2；
First resonator (131) of second bandpass filter (13) includes the first intermediate conveyor line (1311) and the first right side
Transmission line (1312), wherein the first intermediate conveyor line (1311) is adjacent and parallel with the 3rd incoming feeder (130),
One end of the first intermediate conveyor line (1311) is vertical with first right side transmission line (1312) to be connected, and described first
Right side transmission line (1312) is located in a vertical straight line with the anchor point p2.
9. a kind of plane low pass band logical triplexer according to claim 1, it is characterised in that：First bandpass filter
(12), the input feed or output feed of second bandpass filter (13) and the low pass filter (11) use tap
Feed or couple feed.
10. according to a kind of any described plane low pass band logical triplexer of claim 1 to 9, it is characterised in that：The transmission line
Using microstrip line, and it is straight line or the form of broken line.
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| CN105207639A (en) * | 2014-06-19 | 2015-12-30 | 中兴通讯股份有限公司 | Planar filter device |
| CN105489980A (en) * | 2015-12-18 | 2016-04-13 | 华南理工大学 | High-isolation low-pass and band-pass triplexer |
| CN105514547A (en) * | 2016-01-27 | 2016-04-20 | 华南理工大学 | Low-pass band-pass five-duplex based on novel frequency separation structure |
| CN106848516B (en) * | 2017-01-09 | 2020-04-07 | 华南理工大学 | Wide stop band microstrip triplexer based on cross-shaped resonator |
| CN106654475B (en) * | 2017-01-12 | 2019-11-15 | 华南理工大学 | Based on the microstrip-fed triplexer for sharing three mode resonant cavities |
| CN108390135B (en) * | 2018-04-23 | 2020-02-18 | 上海中航欣盛航空技术有限公司 | Microstrip duplexer |
| CN111082191B (en) * | 2019-12-25 | 2021-02-02 | 南通大学附属医院 | Duplexer with independently designed channels |
| CN115513621B (en) * | 2022-09-23 | 2023-12-15 | 中国科学院物理研究所 | Microstrip pattern layer, preparation method thereof and low pass band pass filter thereof |
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