CN109713410A - A kind of micro-strip Wide stop bands duplexer - Google Patents
A kind of micro-strip Wide stop bands duplexer Download PDFInfo
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Abstract
The invention discloses a kind of micro-strip Wide stop bands duplexers, are produced on double-sided copper-clad dielectric-slab, and double-sided copper-clad dielectric-slab one side is microstrip line layer, and another side is to cover copper earth plate；Input port, the first output port, second output terminal mouth, the first resonator, the second resonator, third resonator, the 4th resonator, the 5th resonator and sixth resonator are respectively formed on microstrip line layer；Each resonator is quarter-wave short-circuit resonant device.First, second and third resonator is same group of resonator, is worked in 2.5GHz；Fourth, fifth, six resonators are another group of resonator, are worked in 2GHz.The present invention realizes the characteristic of duplexer and generate zero point near pass-band using two groups of resonators improves selectivity, with smaller harmonic wave and noise signal interference and wider rejection band, master-plan of the present invention is simple and compact, small in size, it is at low cost, it is applicable to plurality of communication systems.
Description
Technical field
The present invention relates to the technical fields of plane microstrip filter, refer in particular to a kind of micro-strip Wide stop bands duplexer.
Background technique
Wireless communication technique is grown rapidly, and the division between each frequency range is more and more finer, therefore each communications band of bring
Between interference phenomenon it is also increasingly severe, so the performance of bandpass filter determines the work quality of communication system.In band
Bandpass filter refers to that the wave for allowing special frequency channel passes through, while shielding other frequency ranges, before operating mainly in signal transmitting terminal
Grade and the rear class of signal receiving end guarantee the pure of desired signal for inhibiting harmonic wave and noise signal.In a communications system may be used
The signal of different frequency can be inputted with a port, and these signals need to be handled by different systems.Therefore, have
One of effect approach is exactly to research and develop high performance duplexer.
Not only there is very big breakthrough in performance for the research of duplexer in recent years, also continuous in terms of size
Progress.It is by input port two groups of resonators in parallel, by resonator by energy coupling that traditional method, which obtains duplexer,
Past, but often its outstanding problem is the influence of resonator itself parasitic passband to influence overall performance.
In order to overcome the disadvantages and deficiencies of the prior art, two groups of different resonator combination couplings are utilized this paper presents a kind of
The method that zygonema loads short-circuit minor matters devises a kind of novel micro-strip Wide stop bands duplexer.The bending of microstrip line many places, and close
Reason is distributed in two-dimensional space, realizes the target of volume miniaturization.
Summary of the invention
The purpose of the present invention is to overcome the shortcomings of the existing technology and deficiency, proposes a kind of compact-sized reliable micro-strip
Wide stop bands duplexer realizes dual frequency characteristics in the way of the coupling of two groups of third-order filters, utilizes parallel coupled line load open circuit
The method of minor matters overcomes harmonic wave and noise signal to interfere, and obtains wider rejection band, in addition, by carrying out layout design to microstrip line,
Smaller size smaller is obtained under the premise of realizing performance optimization.
To achieve the above object, technical solution provided by the present invention are as follows: a kind of micro-strip Wide stop bands duplexer, to print electricity
The mode of road plate is produced on double-sided copper-clad dielectric-slab, and the one side of the double-sided copper-clad dielectric-slab is microstrip line layer, another
Side is to cover copper earth plate；Input port, the first output port, second output terminal are respectively formed on the microstrip line layer
Mouth, the first resonator, the second resonator, third resonator, the 4th resonator, the 5th resonator and sixth resonator；It is described defeated
Inbound port is connected with the first feeder line, is used for feed-in electromagnetic wave signal；First output port is connected with the second feeder line, for presenting
Electromagnetic wave signal out；The second output terminal mouth is connected with third feeder line, for feeding out electromagnetic wave signal；First output end
The combination of combination and second output terminal mouth and third feeder line of the mouth with the second feeder line is located at the two sides of the first feeder line, and described
Second feeder line and third feeder line are respectively perpendicular to the first feeder line, first resonator, the second resonator and third resonator position
In the rectangular area being made of the first feeder line and the second feeder line, the 4th resonator, the 5th resonator and sixth resonator
In the rectangular area being made of the first feeder line and third feeder line；The input port and the first feeder line pass through coupling gap pair
It is fed positioned at the first resonator of the first feeder line two sides and the 4th resonator, first resonator is by the first ground connection
One quarter-wave short-circuit resonant device of empty, the first microstrip line and the second microstrip line composition, first microstrip line connect
The second microstrip line is connect, and the first ground connection sky is placed on the end of the first microstrip line, the 4th resonator is connect by second
One quarter-wave short-circuit resonant device of air-ground, third microstrip line and the 4th microstrip line composition, the third microstrip line
The 4th microstrip line is connected, and the second ground connection sky is placed on the end of third microstrip line, first ground connection is empty and second connects
It is air-ground to be used to connect microstrip line and earth plate；First resonator is by the first ground connection sky to the second resonator and third resonance
Device carries out couple feed, and first resonator and the second resonator are in mirror symmetry about the central axes of third resonator,
Second resonator feeds the second feeder line by coupling gap, and signal is fed out from the first output port, completes signal
Transmission；Second resonator quarter-wave that empty, the 5th microstrip line and the 6th microstrip line form by the first ground connection
Long short-circuit resonant device, the 5th microstrip line connects the 6th microstrip line, and first ground connection vacancy is in the 5th microstrip line
End, the third resonator quarter-wave that empty, the 7th microstrip line and the 8th microstrip line form by the first ground connection
Long short-circuit resonant device, the 7th microstrip line connects the 8th microstrip line, and first ground connection vacancy is in the 7th microstrip line
End；4th resonator carries out couple feed to the 5th resonator and sixth resonator by the way that the second ground connection is empty, and described
4th resonator and the 5th resonator are in mirror symmetry about the central axes of sixth resonator, and the 5th resonator passes through coupling
Gap feeds third feeder line, and signal is fed out from second output terminal mouth, completes signal transmission；5th resonator be by
The quarter-wave short-circuit resonant device that second ground connection is empty, the 9th microstrip line and the tenth microstrip line form, the described 9th
Microstrip line connect the tenth microstrip line, and it is described second ground connection vacancy in the end of the 9th microstrip line, the sixth resonator be by
The quarter-wave short-circuit resonant device that second ground connection is empty, the 11st microstrip line and the 12nd microstrip line form, it is described
11st microstrip line connects the 12nd microstrip line, and second ground connection vacancy is in the end of the 11st microstrip line.
Further, first resonator, the second resonator and third resonator are same group of resonator, and work exists
2.5GHz；4th resonator, the 5th resonator and sixth resonator are another group of resonator, are worked in 2GHz.
Further, first resonator, the second resonator, the 4th resonator and the 5th resonator are subtracted by bending
The size of few resonator.
Further, the third resonator and sixth resonator are T-shaped structure, to reduce the size of resonator.
Further, the input port, the first output port and second output terminal mouth are 50 ohm of matching ports.
Compared with prior art, the present invention have the following advantages that with the utility model has the advantages that
1, the present invention realizes the characteristic of duplexer and generate zero point near pass-band using two groups of resonators improves selection
Property.
2, duplexer proposed by the present invention has smaller harmonic wave and noise signal interference and wider rejection band.
3, present invention design is simple, small in size, at low cost, is applicable to plurality of communication systems.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of micro-strip Wide stop bands duplexer proposed by the present invention.
Fig. 2 is the scattering parameter simulation result diagram of micro-strip Wide stop bands duplexer proposed by the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer and more explicit, right as follows in conjunction with drawings and embodiments
The present invention is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and do not have to
It is of the invention in limiting.
As shown in Figure 1, micro-strip Wide stop bands duplexer provided by the present embodiment, is produced on double in the manner of a printed circuit board
Face is covered on copper dielectric-slab 21, and the one side of double-sided copper-clad dielectric-slab 21 is microstrip line layer, and another side is to cover copper earth plate；?
Input port 1, the first output port 2, second output terminal mouth 3, the first resonator R1, are respectively formed on the microstrip line layer
Two resonator R2, third resonator R3, the 4th resonator R4, the 5th resonator R5 and sixth resonator R6；The input port
1, the first output port 2 and second output terminal mouth 3 are 50 ohm of matching ports；The first resonator R1, the second resonator
R2 and third resonator R3 is same group of resonator, and work is in 2.5GHz, the 4th resonator R4, the 5th resonator R5 and the
Six resonator R6 are another group of resonator, and work works independently, can individually adjust in 2GHz, two groups of resonator.
The input port 1 is connected with the first feeder line 4, is used for feed-in electromagnetic wave signal；First output port 2 connects
There is the second feeder line 5, for feeding out electromagnetic wave signal；The second output terminal mouth 3 is connected with third feeder line 6, for feeding out electromagnetism
Wave signal；The combination of first output port 2 and the second feeder line 5 and the combination of second output terminal mouth 3 and third feeder line 6 are distinguished
Positioned at the two sides of the first feeder line 4, and second feeder line 5 and third feeder line 6 are respectively perpendicular to the first feeder line 4, and described first is humorous
Vibration device R1, the second resonator R2 and third resonator R3 are located in the rectangular area being made of the first feeder line 4 and the second feeder line 5,
The 4th resonator R4, the 5th resonator R5 and sixth resonator R6 are straight positioned at being made of the first feeder line 4 and third feeder line 6
In angular zone；The input port 1 and the first feeder line 4 pass through coupling gap to the first resonator for being located at 4 two sides of the first feeder line
R1 and the 4th resonator R4 are fed, and the first resonator R1 is micro- by empty 19, first microstrip line 7 and second of the first ground connection
With the quarter-wave short-circuit resonant device that line 8 forms, first microstrip line 7 connects the second microstrip line 8, and described
First ground connection sky 19 is placed on the end of the first microstrip line 7, and the 4th resonator R4 is to be grounded empty 20, third micro-strip by second
One quarter-wave short-circuit resonant device of line 13 and the 4th microstrip line 14 composition, the connection of third microstrip line 13 the 4th
Microstrip line 14, and the second ground connection sky 20 is placed on the end of third microstrip line 13, the first ground connection sky 19 and second connects
Air-ground 20 for connecting microstrip line and earth plate；The first resonator R1 by the empty 19 couple of second resonator R2 of the first ground connection and
Third resonator R3 carries out couple feed, and the first resonator R1 and the second resonator R2 are about in third resonator R3
Axis is in mirror symmetry, and the second resonator R2 feeds the second feeder line 5 by coupling gap, and signal is exported from first
Port 2 is fed out, and completes signal transmission；The second resonator R2 is micro- by empty 19, the 5th microstrip line 10 and the 6th of the first ground connection
With the quarter-wave short-circuit resonant device that line 11 forms, the 5th microstrip line 10 connects the 6th microstrip line 11, and
The first ground connection sky 19 is located at the end of the 5th microstrip line 10, and the third resonator R3 is by the first ground connection sky the 19, the 7th
One quarter-wave short-circuit resonant device of microstrip line 9 and the 8th microstrip line 12 composition, the 7th microstrip line 9 connection the
Eight microstrip lines 12, and the first ground connection sky 19 is located at the end of the 7th microstrip line 9；The 4th resonator R4 connects by second
Air-ground 20 couple of the 5th resonator R5 and sixth resonator R6 carries out couple feed, and the 4th resonator R4 and the 5th resonator
R5 is in mirror symmetry about the central axes of sixth resonator R6, and the 5th resonator R5 is by coupling gap to third feeder line 6
It is fed, signal is fed out from second output terminal mouth 3, completes signal transmission；The 5th resonator R5 is empty by the second ground connection
20, a quarter-wave short-circuit resonant device of the 9th microstrip line 16 and the tenth microstrip line 17 composition, the 9th micro-strip
Line 16 connects the tenth microstrip line 17, and the second ground connection sky 20 is located at the end of the 9th microstrip line 16, the sixth resonator
R6 is grounded the quarter-wave short circuit that empty 20, the 11st microstrip line 15 and the 12nd microstrip line 18 form by second
Resonator, the 11st microstrip line 15 connects the 12nd microstrip line 18, and the second ground connection sky 20 is located at the 11st micro-strip
The end of line 15.
The first resonator R1, the second resonator R2, the 4th resonator R4 and the 5th resonator R5 by bend come
Reduce the size of resonator；The third resonator R3 and sixth resonator R6 is T-shaped structure, to reduce the ruler of resonator
It is very little.
To realize Wide stop bands, the length by adjusting parallel coupled line in open circuit minor matters controls transmission zero, and parasitism is logical
Band inhibits, that is, adjusts the coupling length of the first feeder line 4 and the first microstrip line 7 and the length adjustment transmission zero of the second microstrip line 8；
Similarly, the coupling length of the second feeder line 5 and the 5th microstrip line 10 and the length adjustment transmission zero of the 6th microstrip line 11 are adjusted；It adjusts
The length adjustment transmission zero of the coupling length and the 4th microstrip line 14 of whole first feeder line 4 and third microstrip line 13；Adjust third
The length adjustment transmission zero of the coupling length and the tenth microstrip line 17 of feeder line 6 and the 9th microstrip line 16.
Input port 1 feeds the first resonator R1 by coupling gap with the first feeder line 4.Due to first, second and third
Resonator R1, R2, R3 share the first ground connection sky 19, and the first resonator R1 couples a signal to the second resonance by the effect coupled
Device R2 and third resonator R3.The working frequency of first, second and third resonator R1, R2, R3 is 2.5GHz, therefore, input signal frequency
Rate is 2.5GHz, and the electromagnetic wave signal of 1 feed-in of input port can be passed through signal by first, second and third resonator R1, R2, R3
Gap coupled transfer is to the second feeder line 5, to be transferred to the first output port 2.Similarly, input port 1 passes through with the first feeder line 4
Coupling gap feeds the 4th resonator R4.Since fourth, fifth, six resonator R4, R5, R6 share the second ground connection sky 20,
4th resonator R4 couples a signal to the 5th resonator R5 and sixth resonator R6 by the effect coupled.Fourth, fifth, six is humorous
The working frequency of vibration device R4, R5, R6 are 2GHz, therefore, frequency input signal 2GHz, the electromagnetic wave letter of 1 feed-in of input port
Number can by fourth, fifth, six resonator R4, R5, R6 by signal by gap coupled transfer to third feeder line 6, to be transferred to
Second output terminal mouth 3.Since resonator design is the method for sharing the empty coupling of ground connection, transmission zero can be generated near pass-band
Point improves selectivity.
Fig. 2 is the scattering parameter simulation result diagram of micro-strip Wide stop bands duplexer proposed by the present invention.Horizontal axis indicates the present invention
The signal frequency of micro-strip Wide stop bands duplexer, the longitudinal axis indicate amplitude, including insertion loss S21Amplitude and insertion loss S31Width
Degree, S21Indicate the relationship of micro-strip Wide stop bands duplexer frequency input signal and output signal frequency of the present invention, and input terminal is defeated
Inbound port 1, output end are the first output port 2, corresponding mathematical function are as follows: output power/input power (dB)=20*
log|S21|.Similarly, S31Indicate the relationship of micro-strip Wide stop bands duplexer frequency input signal and output signal frequency of the present invention, and
Input terminal is input port 1, and output end is second output terminal mouth 3, corresponding mathematical function are as follows: output power/input power
(dB)=20*log | S31|.It can be seen from the figure that only centre frequency is 2.50GHz's when signal is inputted from input port 1
Signal can be exported from the first output port 2, and the insertion loss in passband is smaller；When signal is inputted from input port 1, only
Centre frequency is that the signal of 2GHz can be exported from second output terminal mouth 3, and the insertion loss in passband is smaller.In stopband,
In the range of being less than 9GHz, insertion loss is down to 20dB hereinafter, illustrating micro-strip Wide stop bands duplexer filtering clutter of the invention
Ability it is big, the annoyance level that the signal of transmission is subject to is low.
In conclusion micro-strip Wide stop bands duplexer of the invention is made of two groups of resonators, each pass-band performance is independent
It is adjustable.By parallel coupled line and short-circuit minor matters in conjunction with method introduce transmission zero and inhibit higher hamonic wave, thus obtain compared with
Wide stop bands.Therefore, the present invention is with simple and compact for structure, small in size, double frequency-band pass-band loss low selectivity is high, stopband is wide, suppression
The advantages that processing procedure degree is high, is worthy to be popularized.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (5)
1. a kind of micro-strip Wide stop bands duplexer, is produced in the manner of a printed circuit board on double-sided copper-clad dielectric-slab, described two-sided
The one side for covering copper dielectric-slab is microstrip line layer, and another side is to cover copper earth plate；It is characterized by: in the microstrip line layer
On be respectively formed with input port, the first output port, second output terminal mouth, the first resonator, the second resonator, third resonance
Device, the 4th resonator, the 5th resonator and sixth resonator；The input port is connected with the first feeder line, is used for feed-in electromagnetism
Wave signal；First output port is connected with the second feeder line, for feeding out electromagnetic wave signal；The second output terminal mouth connection
There is third feeder line, for feeding out electromagnetic wave signal；The combination of first output port and the second feeder line and second output terminal mouth
The two sides of the first feeder line are located at the combination of third feeder line, and second feeder line and third feeder line are respectively perpendicular to first
Feeder line, first resonator, the second resonator and third resonator are located at the right angle being made of the first feeder line and the second feeder line
In region, the 4th resonator, the 5th resonator and sixth resonator are straight positioned at being made of the first feeder line and third feeder line
In angular zone；The input port and the first feeder line are by coupling gap to the first resonator for being located at the first feeder line two sides and the
Four resonators are fed, and first resonator is grounded sky, one that the first microstrip line and the second microstrip line form by first
A quarter-wave short-circuit resonant device, first microstrip line connect the second microstrip line, and the empty placement of the first ground connection
In the end of the first microstrip line, the 4th resonator is made of the second ground connection sky, third microstrip line and the 4th microstrip line
One quarter-wave short-circuit resonant device, the third microstrip line connects the 4th microstrip line, and the second ground connection sky is put
It sets in the end of third microstrip line, first ground connection is empty and the second ground connection is empty for connecting microstrip line and earth plate；Described
One resonator carries out couple feed to the second resonator and third resonator by the way that the first ground connection is empty, and first resonator and
Second resonator is in mirror symmetry about the central axes of third resonator, and second resonator is presented by coupling gap second
Line is fed, and signal is fed out from the first output port, completes signal transmission；Second resonator be it is empty by the first ground connection,
One quarter-wave short-circuit resonant device of the 5th microstrip line and the 6th microstrip line composition, the 5th microstrip line connection the
Six microstrip lines, and first ground connection vacancy is in the end of the 5th microstrip line, the third resonator be it is empty by the first ground connection, the
One quarter-wave short-circuit resonant device of seven microstrip lines and the 8th microstrip line composition, the 7th microstrip line connection the 8th
Microstrip line, and first ground connection vacancy is in the end of the 7th microstrip line；4th resonator is empty to the by the second ground connection
Five resonators and sixth resonator carry out couple feed, and the 4th resonator and the 5th resonator are about sixth resonator
Central axes are in mirror symmetry, and the 5th resonator feeds third feeder line by coupling gap, and signal is exported from second
Port is fed out, and completes signal transmission；By the second ground connection, empty, the 9th microstrip line and the tenth microstrip line form 5th resonator
A quarter-wave short-circuit resonant device, the 9th microstrip line connects the tenth microstrip line, and second ground connection is empty
Positioned at the end of the 9th microstrip line, the sixth resonator is empty, the 11st microstrip line and the 12nd microstrip line by the second ground connection
One quarter-wave short-circuit resonant device of composition, the 11st microstrip line connect the 12nd microstrip line, and described the
Two ground connection vacancy are in the end of the 11st microstrip line.
2. a kind of micro-strip Wide stop bands duplexer according to claim 1, it is characterised in that: first resonator, second
Resonator and third resonator are same group of resonator, are worked in 2.5GHz；4th resonator, the 5th resonator and the 6th
Resonator is another group of resonator, is worked in 2GHz.
3. a kind of micro-strip Wide stop bands duplexer according to claim 1, it is characterised in that: first resonator, second
Resonator, the 4th resonator and the 5th resonator reduce the size of resonator by bending.
4. a kind of micro-strip Wide stop bands duplexer according to claim 1, it is characterised in that: the third resonator and the 6th
Resonator is T-shaped structure, to reduce the size of resonator.
5. a kind of micro-strip Wide stop bands duplexer according to claim 1, it is characterised in that: the input port, first defeated
Exit port and second output terminal mouth are 50 ohm of matching ports.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5023866A (en) * | 1987-02-27 | 1991-06-11 | Motorola, Inc. | Duplexer filter having harmonic rejection to control flyback |
| CN103633400A (en) * | 2013-11-19 | 2014-03-12 | 华南理工大学 | Electromagnetic hybrid coupling-based micro-strip duplexer |
| CN108448212A (en) * | 2018-01-11 | 2018-08-24 | 华南理工大学 | A kind of duplexing filtered switch based on coupling control |
-
2019
- 2019-02-21 CN CN201910128836.2A patent/CN109713410B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5023866A (en) * | 1987-02-27 | 1991-06-11 | Motorola, Inc. | Duplexer filter having harmonic rejection to control flyback |
| CN103633400A (en) * | 2013-11-19 | 2014-03-12 | 华南理工大学 | Electromagnetic hybrid coupling-based micro-strip duplexer |
| CN108448212A (en) * | 2018-01-11 | 2018-08-24 | 华南理工大学 | A kind of duplexing filtered switch based on coupling control |
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| Publication number | Publication date |
|---|---|
| CN109713410B (en) | 2023-12-01 |
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