CN205985291U - Radio transmitter and miniaturized directional coupler thereof - Google Patents
Radio transmitter and miniaturized directional coupler thereof Download PDFInfo
- Publication number
- CN205985291U CN205985291U CN201620985573.9U CN201620985573U CN205985291U CN 205985291 U CN205985291 U CN 205985291U CN 201620985573 U CN201620985573 U CN 201620985573U CN 205985291 U CN205985291 U CN 205985291U
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- microstrip line
- directional coupler
- circuit board
- miniaturization
- line
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Abstract
The utility model provides a radio transmitter and miniaturized directional coupler thereof, it is preceding to coupled strip line and reverse coupled strip line that includes the circuit board and lays that owner on this circuit board transmits the microstrip line and be located respectively that this owner transmits the microstrip line both sides, and this circuit board is having at least the circuit board of three metal level, this owner is transmitted the microstrip line, is precedingly laid on a surface metal layer of this circuit board to coupled strip line and reverse coupled strip line, have the corresponding intermediate junction end of output that transmits the microstrip line with this owner to coupled strip line before being somebody's turn to do, this reversion coupled strip line has the corresponding intermediate junction end of input that transmits the microstrip line with this owner, this directional coupler is still including supplementary transmission microstrip line, be used for with two intermediate junctions end couples together, wherein, should supplementary transmission microstrip line transmits with this owner that there is a metal level that is used for ground connection at at least interval between the microstrip line. The utility model discloses circuit board area occupied both can have been reduced, isolation and directionality index can also be improved.
Description
Technical field
This utility model is related to a kind of communication equipment, particularly to a kind of directional coupler of wireless transmitting device.
Background technology
In a communications system, directional coupler is a kind of very important device, is commonly used for the output of power amplifier
Power detection and standing wave detection are come in end.As shown in figure 1, a kind of existing directional coupler 30a, it is using bilateral coupling microstrip
Line realizes forward power coupling and backward power coupling respectively.This directional coupler 30a generally comprises：Main transmission microstrip line 1a,
It has input 11a and outfan 12a；Forward direction coupled microstrip line 2a, it has outfan 21a and load end 22a；Reversely coupling
Close microstrip line 3a, it has outfan 31a and load end 32a；And two matched loads 4a, 5a, respectively with load end 22a,
32a is connected, and each matched load 4a, 5a are made up of four components and parts.When actual circuit board is realized, main transmission microstrip line
1a, forward direction coupled microstrip line 2a and reverse coupled microstrip line 3a are the same surfaces being laid in circuit board, matched load 4a, 5a's
Constitute another surface that device is installed in circuit board.This directional coupling structure, due to each coupled microstrip line 2a, 3a
Length longer, be essentially the quarter-wave of required operating frequency, area occupied is larger；And, coupled microstrip line 2a,
Load end 22a, 32a of 3a are connected to matched load 4a, 5a, so that the composition number of devices of whole directional coupler 30a is larger；
Lead to the physical size ratio of directional coupler 30a larger, be not easy to the Miniaturization Design of product.
Utility model content
Technical problem to be solved in the utility model is to overcome the shortcomings of existing for above-mentioned prior art, and proposes one
Plant the directional coupler of radio transmitter and its miniaturization, both can reduce circuit board area occupied additionally it is possible to improve isolation
Degree and directivity index, thus be easy to the miniaturization of product.
This utility model is directed to above-mentioned technical problem and proposes a kind of directional coupler of miniaturization, including circuit board and laying
Main transmission microstrip line on the board and be located at respectively the forward direction coupled microstrip line of this main transmission microstrip line both sides with anti-
To coupled microstrip line, this circuit board is the circuit board at least with three metal levels；This main transmission microstrip line, forward direction coupling microstrip
Line and reverse coupled microstrip line are laid on a surface metal-layer of this circuit board；This is front to have and this main biography to coupled microstrip line
The corresponding middle connection end of the outfan of defeated microstrip line, this reverse coupled microstrip line have and this main transmission microstrip line input
Hold corresponding middle connection end；This directional coupler also includes auxiliary transmission microstrip line, for by this front to coupled microstrip line
Middle connection end couple together with the middle connection end of this reverse coupled microstrip line, wherein, this auxiliary transmission microstrip line with should
Between main transmission microstrip line at least between be separated with one for ground connection metal level.
In certain embodiments, via and this auxiliary microstrip transmission line are passed through in this front middle connection end to coupled microstrip line
One end be connected；The other end phase of via and this auxiliary microstrip transmission line is passed through in the middle connection end of this reverse coupled microstrip line
Even.
In certain embodiments, this auxiliary transmission microstrip line be laid in relative with this main transmission microstrip line place metal level
On another surface metal-layer.
In certain embodiments, this auxiliary transmission microstrip line is Z-shape, have parallel to this main transmission microstrip line main body and
Two linkage sections perpendicular to this main body positioned at this main body two ends.
In certain embodiments, the metal level part of the surrounding of this auxiliary transmission microstrip line is ground connection.
In certain embodiments, the width of this auxiliary transmission microstrip line is related to the impedance setting.
In certain embodiments, the width of this auxiliary transmission microstrip line be more than this front to coupled microstrip line/this reverse coupled
The width of microstrip line, and the width less than this main transmission microstrip line.
In certain embodiments, the frequency that this directional coupler is suitable for is less than 1GHz.
In certain embodiments, the frequency range that this directional coupler is suitable for is 136-174MHz.
This utility model also proposes a kind of radio transmitter for above-mentioned technical problem, including power amplifier and with this
The directional coupler that the outfan of power amplifier is connected, this directional coupler is the directional couple of miniaturization as above
Device.
Compared with prior art, the directional coupler of miniaturization of the present utility model passes through dexterously in setting auxiliary transmission
This front middle connection end to coupled microstrip line and the middle connection end of this reverse coupled microstrip line are coupled together by microstrip line,
And make this auxiliary transmission microstrip line and this main transmission microstrip line between at least between be separated with one for ground connection metal level, with work
For auxiliary transmission microstrip line with transmission microstrip line reference ground, can shorten this front to coupled microstrip line/this reverse coupled micro-strip
The length of line, and save two matched loads, both can reduce circuit board area occupied additionally it is possible to improve isolation and directivity
Index, thus be easy to the miniaturization of product.
Brief description
Fig. 1 is an electric principle schematic, and the circuit structure of existing directional coupler is described.
Fig. 2 is an electric principle schematic, and the circuit structure of directional coupler of the present utility model is described.
Fig. 3 is the cross-sectional view of a circuit board, illustrates directional coupler of the present utility model on circuit boards
Realize.
Fig. 4 is an electric theory diagram, and the circuit structure of radio transmitter of the present utility model is described.
Wherein, description of reference numerals is as follows：To coupling before prior art 30a directional coupler 1a main transmission microstrip line 2a
Close microstrip line 3a reverse coupled microstrip line 4a, 5a matched load 11a input 12a outfan 21a, 31a outfan
22a, 32a load end；Micro- to coupling before the main transmission microstrip line 2 of this utility model 10 power amplifier 30 directional coupler 1
Band wire 3 reverse coupled microstrip line, 6 auxiliary transmission microstrip line, 11 input, 12 outfan, 21 coupled end 31 isolation end 22,
32 middle connection end 61 main bodys 62,63 linkage section, 9 circuit board, 91 first medium layer, 92 second dielectric layer 93 intermetallic metal
Layer 94,95 via.
Specific embodiment
Below in conjunction with the accompanying drawing of this specification, further elaboration is given to preferred embodiment of the present utility model.
Refering to Fig. 2 to Fig. 4, Fig. 2 is an electric principle schematic, and the circuit knot of directional coupler of the present utility model is described
Structure.Fig. 3 is the cross-sectional view of a circuit board, and directional coupler of the present utility model realization on circuit boards is described.
Fig. 4 is an electric theory diagram, and the circuit structure of radio transmitter of the present utility model is described.The utility model proposes a kind of nothing
Line electricity transmitter, it includes the directional coupler 30 that power amplifier 10 and the outfan with this power amplifier 10 are connected, should
Directional coupler 30 is used for detecting output and the matched load conditions of power amplifier 10.Wherein, the output work detecting
Rate can be used to carry out Power Control；The matched load conditions detecting can be used to do vswr protection, when due to external condition
When change causes the load of power amplifier 10 to mismatch, can suitably reduce the output of power amplifier 10, to protect
Power amplifier 10 is not damaged by.
The directional coupler 30 of miniaturization of the present utility model, generally comprises：Circuit board 9, this circuit board 9 is at least to have
The circuit board of three metal levels；The main transmission microstrip line 1 that is laid on a surface metal-layer of this circuit board 9 and being located at respectively
The forward direction coupled microstrip line 2 of this main transmission microstrip line 1 both sides and reverse coupled microstrip line 3；And it is laid in the another of this circuit board 9
Auxiliary transmission microstrip line 6 on one surface metal-layer, for front to coupled microstrip line 2 with this reverse coupled microstrip line 3 even by this
Pick up come, wherein, this auxiliary transmission microstrip line 6 and this main transmission microstrip line 1 between at least between be separated with one for ground connection gold
Belong to layer 93.
In the present embodiment, this circuit board 9 has three metal levels.Wherein, the metal level of top surface be laid with main transmission micro-
Band wire 1, the metal level of bottom surface is laid with auxiliary transmission microstrip line 6, and metal level 93 is to be folded in first medium layer 91 and second Jie
Between matter layer 92.In other embodiments, this circuit board 9 can be 4 layers, 6 layers, 8 layers etc..This auxiliary transmission microstrip line 6 is not
Must be laid on the surface metal-layer of circuit board 9, can be laid on intermediate metal layer.
This front one end to coupled microstrip line 2 is isolation end (outfan 21a pair with aforementioned forward direction coupled microstrip line 2a
Should) 21, the other end be (to couple micro- with aforementioned forward direction with the corresponding middle connection end of outfan 12 of this main transmission microstrip line 1
The load end 22a of band wire 2a corresponds to) 22.One end phase of via 95 and this auxiliary microstrip transmission line 6 is passed through in this middle connection end 22
Even；One end of this reverse coupled microstrip line 3 be coupled end (corresponding with the outfan 31a of aforementioned reverse coupled microstrip line 3a) 31,
The other end is the middle connection end corresponding with the input 11 of this main transmission microstrip line 1 (with aforementioned reverse coupled microstrip line 3a
Load end 32a correspond to) 32.This middle connection end 32 is connected with the other end of this auxiliary microstrip transmission line 6 by via 94.Should
Auxiliary transmission micro-strip 6 line is Z-shape, has the main body 61 and positioned at this main body 61 two ends two parallel to this main transmission microstrip line 1
The individual linkage section 62,63 perpendicular to this main body 61.It is preferred that the metal level part of the surrounding of this auxiliary transmission microstrip line 6 is to connect
Ground.It is noted that the set-up mode of this auxiliary transmission microstrip line 6 of the present utility model, be equivalent to and increased simultaneously
Forward direction coupled microstrip line 2 and the length of this reverse coupled microstrip line 3, are conducive to the circuit board reducing directional coupler 30 to take face
Long-pending.
This main transmission microstrip line 1 is one 50 ohm of impedance line, and its live width is determined according to power capacity.This front to coupling
The width of microstrip line 2 and this reverse coupled microstrip line 3 and its with this main transmission microstrip line 1 distance determined according to the degree of coupling.Should
The width of auxiliary transmission microstrip line 6 is related to the impedance setting.This auxiliary transmission microstrip line 6 and this main transmission microstrip line 1 are in sky
Between arrangement not Existence restraint condition.In the present embodiment, the design impedance of this auxiliary transmission microstrip line 6 is 50 ohm.This is auxiliary
The width helping transmission microstrip line 6 is more than this front width to this reverse coupled microstrip line 3 of coupled microstrip line 2/, and is less than this main biography
The width of defeated microstrip line 1.It is preferred that the frequency range that this directional coupler 30 is suitable for is 136-174MHz.In other application,
The frequency that this directional coupler 30 is suitable for is less than 1GHz.
The technical specification of the directional coupler 30 of this utility model miniaturization and existing directional coupler 30a compares and sees below
Table.
It can be seen that, this utility model all has clear improvement on isolation and directivity index, and isolation and directivity refer to
Mark is the key index weighing directional coupler performance quality.
The directional coupler 30 of this utility model miniaturization by dexterously setting auxiliary transmission microstrip line 6 by before this
Couple together to the middle connection end 22 of coupled microstrip line 2 and the middle connection end 32 of this reverse coupled microstrip line 3, and make this
Between auxiliary transmission microstrip line 6 and this main transmission microstrip line 1 at least between be separated with one for ground connection metal level 93, using as auxiliary
Help the reference ground of transmission microstrip line 6 and main transmission microstrip line 1, can be shortened this front micro- to coupled microstrip line 2 and this reverse coupled
The length of band wire 3, and save two matched loads, both can reduce circuit board area occupied (directional couple of the present utility model
The board area that device 30 takies is only the 55% of the board area of directional coupler 30a occupancy of prior art) additionally it is possible to
Improve isolation and directivity index, thus being easy to the miniaturization of product.
The above is only preferred embodiment of the present utility model, is not intended to limit embodiment of the present utility model,
Those of ordinary skill in the art, according to central scope of the present utility model and spirit, can very easily carry out corresponding accommodation
Or modification, therefore protection domain of the present utility model should the protection domain required by by claims be defined.
Claims (10)
1. a kind of directional coupler of miniaturization, including circuit board and lay main transmission microstrip line on the board and point
Not Wei Yu this main transmission microstrip line both sides forward direction coupled microstrip line and reverse coupled microstrip line it is characterised in that this circuit board
It is the circuit board at least with three metal levels；This main transmission microstrip line, forward direction coupled microstrip line and reverse coupled microstrip line cloth
It is located on a surface metal-layer of this circuit board；This front to coupled microstrip line have with this main transmission microstrip line outfan relative
The middle connection end answered, this reverse coupled microstrip line has the middle connection corresponding with the input of this main transmission microstrip line
End；This directional coupler also includes auxiliary transmission microstrip line, for will be anti-with this for this front middle connection end to coupled microstrip line
Couple together to the middle connection end of coupled microstrip line, wherein, between this auxiliary transmission microstrip line and this main transmission microstrip line extremely
Be separated between few one for ground connection metal level.
2. the directional coupler of miniaturization as claimed in claim 1 is it is characterised in that this front connects to the centre of coupled microstrip line
Connect end to be connected with one end of this auxiliary microstrip transmission line by via；Via is passed through in the middle connection end of this reverse coupled microstrip line
It is connected with the other end of this auxiliary microstrip transmission line.
3. miniaturization as claimed in claim 1 directional coupler it is characterised in that this auxiliary transmission microstrip line be laid in
On the relative another surface metal-layer of this main transmission microstrip line place metal level.
4. the directional coupler of miniaturization as claimed in claim 1, it is characterised in that this auxiliary transmission microstrip line is Z-shape, has
It is parallel to the main body of this main transmission microstrip line and two linkage sections perpendicular to this main body being located at this main body two ends.
5. the directional coupler of miniaturization as claimed in claim 4 is it is characterised in that the surrounding of this auxiliary transmission microstrip line
Metal level part is ground connection.
6. miniaturization as claimed in claim 1 directional coupler it is characterised in that the width of this auxiliary transmission microstrip line with
The impedance setting is related.
7. the directional coupler of miniaturization as claimed in claim 1 is it is characterised in that the width of this auxiliary transmission microstrip line is big
In this front width to coupled microstrip line/this reverse coupled microstrip line, and the width less than this main transmission microstrip line.
8. miniaturization as claimed in claim 1 directional coupler it is characterised in that this directional coupler be suitable for frequency not
More than 1GHz.
9. miniaturization as claimed in claim 1 directional coupler it is characterised in that this directional coupler be suitable for frequency model
Enclose for 136-174MHz.
10. a kind of radio transmitter, the directional couple be connected including power amplifier and with the outfan of this power amplifier
Device is it is characterised in that this directional coupler is the directional coupler of the miniaturization as described in any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620985573.9U CN205985291U (en) | 2016-08-30 | 2016-08-30 | Radio transmitter and miniaturized directional coupler thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620985573.9U CN205985291U (en) | 2016-08-30 | 2016-08-30 | Radio transmitter and miniaturized directional coupler thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205985291U true CN205985291U (en) | 2017-02-22 |
Family
ID=58041431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620985573.9U Active CN205985291U (en) | 2016-08-30 | 2016-08-30 | Radio transmitter and miniaturized directional coupler thereof |
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| Country | Link |
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| CN (1) | CN205985291U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018039898A1 (en) * | 2016-08-30 | 2018-03-08 | 海能达通信股份有限公司 | Radio transmitter and miniaturized directional coupler thereof |
| CN108134175A (en) * | 2017-12-11 | 2018-06-08 | 南京理工大学 | A kind of miniaturization orthogonal wideband electric bridge |
| CN108987872A (en) * | 2017-06-01 | 2018-12-11 | 株式会社村田制作所 | Bidirectional coupler, monitoring circuit and front-end circuit |
| CN108987873A (en) * | 2017-06-01 | 2018-12-11 | 株式会社村田制作所 | Bidirectional coupler, monitoring circuit and front-end circuit |
| CN114976547A (en) * | 2022-06-07 | 2022-08-30 | Oppo广东移动通信有限公司 | Microstrip line coupler, radio frequency module and printed circuit board |
-
2016
- 2016-08-30 CN CN201620985573.9U patent/CN205985291U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018039898A1 (en) * | 2016-08-30 | 2018-03-08 | 海能达通信股份有限公司 | Radio transmitter and miniaturized directional coupler thereof |
| CN108987872A (en) * | 2017-06-01 | 2018-12-11 | 株式会社村田制作所 | Bidirectional coupler, monitoring circuit and front-end circuit |
| CN108987873A (en) * | 2017-06-01 | 2018-12-11 | 株式会社村田制作所 | Bidirectional coupler, monitoring circuit and front-end circuit |
| CN108987872B (en) * | 2017-06-01 | 2021-02-09 | 株式会社村田制作所 | Bidirectional coupler, monitoring circuit and front-end circuit |
| CN108987873B (en) * | 2017-06-01 | 2021-02-09 | 株式会社村田制作所 | Bidirectional coupler, monitoring circuit and front-end circuit |
| CN108134175A (en) * | 2017-12-11 | 2018-06-08 | 南京理工大学 | A kind of miniaturization orthogonal wideband electric bridge |
| CN114976547A (en) * | 2022-06-07 | 2022-08-30 | Oppo广东移动通信有限公司 | Microstrip line coupler, radio frequency module and printed circuit board |
| CN114976547B (en) * | 2022-06-07 | 2024-02-06 | Oppo广东移动通信有限公司 | Microstrip line coupler, radio frequency module and printed circuit board |
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