CN106549203B - A kind of conversion circuit of coupled microstrip line to rectangular waveguide - Google Patents
A kind of conversion circuit of coupled microstrip line to rectangular waveguide Download PDFInfo
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- CN106549203B CN106549203B CN201610996055.1A CN201610996055A CN106549203B CN 106549203 B CN106549203 B CN 106549203B CN 201610996055 A CN201610996055 A CN 201610996055A CN 106549203 B CN106549203 B CN 106549203B
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- conversion circuit
- annular groove
- microstrip line
- rectangular
- coupled microstrip
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 44
- 230000008878 coupling Effects 0.000 claims abstract description 25
- 238000010168 coupling process Methods 0.000 claims abstract description 25
- 238000005859 coupling reaction Methods 0.000 claims abstract description 25
- 239000000523 sample Substances 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 16
- 239000004020 conductor Substances 0.000 claims abstract description 8
- 238000003780 insertion Methods 0.000 abstract description 10
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- 239000002356 single layer Substances 0.000 abstract description 4
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- 239000000758 substrate Substances 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices
- H01P5/107—Hollow-waveguide/strip-line transitions
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- Waveguide Aerials (AREA)
- Waveguides (AREA)
Abstract
The invention discloses a kind of conversion circuits of coupled microstrip line to rectangular waveguide, the conversion circuit is a coupling probe, the rectangular metal patch for having annular groove is dug centered on the coupling probe, rectangular channel between two conductors of the annular groove and coupled microstrip line is connected to, the rectangular metal patch of annular groove periphery is connected to two conductors of coupled microstrip line, rectangular metal patch outside annular groove and annular groove constitutes the flute profile ring and Microstrip Loop of coupling probe, the working frequency of conversion circuit is determined by the resonant frequency of Microstrip Loop and flute profile ring, coupling probe, which extends vertically into, realizes coupling in rectangular waveguide.Conversion circuit of the present invention can realize on single layer pcb board, have many advantages, such as it is simple in structure, it is easy to process.The experimental results showed that the present invention has big bandwidth (26.5-40GHz), low insertion loss (<0.41dB) and big return loss (>15dB), it can be applied to have in the microwave and millimeter wave circuit and system of Waveguide interface.
Description
Technical field
The present invention relates to a kind of conversion circuit, more particularly to a kind of conversion circuit of coupled microstrip line to rectangular waveguide,
In the circuit and system of the microwave and millimeter wave that can be used for that there is Waveguide interface.
Background technology
In recent years, difference microwave and millimeter wave circuit is due to its inhibiting effect to interference and ambient noise, in communication system
In application it is more and more common.Coupled microstrip line be in differential system apply most planar transmission lines, have small size, it is low at
This advantages that.On the other hand, since rectangular waveguide has high q-factor characteristic, it is widely used in microwave and millimeter wave circuit, uses
To realize the circuits such as various high q-factor transmission lines, filter, power splitter and duplexer.In many microwave applications, rectangular waveguide
As soon as can simultaneously be appeared in a circuit or system with coupled microstrip line, therefore this needs one to realize transmission mould therebetween
The matched conversion circuit of formula.
Differential transmission modes in coupled microstrip line may be implemented to square to the conversion circuit of rectangular waveguide in coupled microstrip line
The conversion of TE10 main moulds in shape waveguide.The bandwidth of transformational structure is an extremely critical performance indicator, is realized as wide as possible
Bandwidth be research an important directions.As the bandwidth of operation of current communication system is more and more wider, existing coupling microstrip
The conversion circuit of line to rectangular waveguide cannot be satisfied demand of the communication system to big bandwidth, be limit communication bandwidth into
One of the bottleneck problem that one step improves.Therefore the demand to the conversion circuit of broadband couple device microstrip line to rectangular waveguide is very urgent.
In existing research report, there are mainly three types of modes for the rectilinear conversion circuit of coupled microstrip line to rectangular waveguide
It realizes.Researcher Z.Tong et al. realizes conversion function using difference paster antenna in W-waveband.Referring to Wen Xian [1]Z.Tong,
A.Stelzer,A Vertical transition between rectangular waveguide and coupled
microstrip lines,IEEE Microwave and Wireless Components Letters,22(2012),251-
253。
Researcher T.Yuasa et al. realizes conversion function using short-circuit slot line structure.Referring to Wen Xian [2]T.Yuasa,
T.Oba,Y.Yahara,Y.Morimoto,T.Owade,M.Miyazaki,A millimeter wave wideband
differential line to waveguide transition using short ended slot Line,
European Microwave Conference,Vol.44,Rome,2014,1004-1007。
Researcher M.Ortner et al. proposes to be based on multi-layer PCB structure design conversion circuit.Referring to Wen Xian [3]
M.Ortner,Z.Tong,T.Ostermann,A millimeter-wave wide-band transition from a
differential microstrip to a rectangular waveguide for 60GHz applications,
European Conference on Antennas and Propagation(EUCAP),Rome,2011,1946-1949。
In three of the above method, the conversion circuit that first method is realized, relative bandwidth 11%, echo in working frequency range
Loss is more than 15dB, and insertion loss is less than 0.5dB；The conversion circuit that second method is realized, relative bandwidth 20.2%, work
Return loss is more than 10dB in frequency range, and insertion loss is less than 1.92dB；The conversion circuit that the third method is realized, bandwidth are
33%, return loss is more than 15dB in working frequency range, and insertion loss is less than 2.3dB.
The first conversion circuit relative bandwidth is too small (11%)；Second of conversion circuit relative bandwidth smaller (20.2%),
And insertion loss is larger (1.92dB)；The third conversion circuit relative bandwidth improves, and reaches 33%, but which employs more
Layer PCB construction, circuit is more complex, and difficulty of processing is big, of high cost.And its insertion loss is very big (2.3dB).These three methods are all
There is the limitation of itself.
Invention content
The purpose of the present invention is to provide a kind of conversion circuit based on single layer PCB circuits, which can obviously carry
It rises bandwidth of operation and insertion loss is small, easy to process.
Coupled microstrip line provided by the invention based on single layer PCB circuits (back sides PCB be metal ground plate) is to rectangular wave
The conversion circuit led is a coupling probe, and the rectangular metal patch for having annular groove, the annulus are dug centered on the coupling probe
Rectangular channel between two conductors of shape slot and coupled microstrip line is connected to, the rectangular metal patch and coupling microstrip of annular groove periphery
Two conductors of line are connected to, the rectangular metal patch of annular groove and annular groove periphery constitute the flute profile ring of coupling probe with
Microstrip Loop, Microstrip Loop are enclosed in the outside of flute profile ring, the working frequency of conversion circuit by Microstrip Loop and flute profile ring resonant frequency
It determines, form twin nuclei closely, coupling probe is extended vertically into rectangular waveguide and realized in coupled microstrip line
The conversion of difference modes and the TE10 main moulds in rectangular waveguide.
If Microstrip Loop and the resonant frequency of flute profile ring are respectively f1 and f2, the conversion circuit in this way can work at the same time
Near f1 and f2 two frequency bins, by selecting f1 and f2 appropriate, the conversion circuit that very wide working band may be implemented.Resonance
Frequency f1 and f2 corresponding wavelength λ 1 and λ 2 is respectively equal to the perimeter of Microstrip Loop and flute profile ring.It, can be with preresearch estimates using the relationship
Resonant frequency f1 and f2 is as follows：
C indicates the light velocity, ε in formulae1、εe2Indicate the equivalent relative dielectric constant of dielectric-slab,
For given working frequency range, resonant frequency f can be preselected1And f2And dielectric board material, then pass through public affairs
Formula (1) and (2) are assured that the size of Microstrip Loop and flute profile ring.Difference may be implemented in the size for adjusting Microstrip Loop and flute profile ring
Working band.
The present invention has the following effects that：
(1) there is very wide bandwidth of operation, entire Ka wave bands (40.6%, 26.5-40GHz) can be covered；
(2) insertion loss is less than 0.41dB；
(3) single side PCB construction is used, it is at low cost, it is easy to process；
(4) circuit structure is simple, convenient to carry out Integration Design with other microwaves, millimetre-wave circuit.
Description of the drawings
Fig. 1 is the dimensional structure diagram of the present invention.
Fig. 2 is the vertical view of the present invention.
Fig. 3 is the pictorial diagram of the present invention (two conversion circuits connect back-to-back in figure).
Fig. 4 is the object test and simulation comparison figure of S parameter of the present invention.
In Fig. 1：1-4-coupled microstrip line of rectangular waveguide 2-metallization VIA, 3-waveguide short face
5-dielectric substrate 6-rectangular metal patches
In Fig. 2：The length L2-of width L1-Microstrip Loop of width W2-microstrip line of W1-Microstrip Loop is micro-
The length of groove width a-waveguide long side of groove width S2-microstrip line of length S1-flute profile ring in waveguide is inserted into line
Spend the diameter L of metal patch in length D-annular groove of b-waveguide short sideshort- coupling probe and waveguide are short
The distance on road surface
Below in conjunction with the accompanying drawings and embodiment invention is further described in detail.
Specific implementation mode
Embodiment
As shown in Figure 1, the coupling microstrip provided by the invention based on single layer PCB circuits (back sides PCB are metal ground plate)
The conversion circuit of line to rectangular waveguide is a coupling probe, is realized on dielectric substrate 5, and being dug centered on the coupling probe has annulus
The rectangular metal patch 6 of shape slot, the rectangular channel between the annular groove and two conductors of coupled microstrip line 4 are connected to, annulus
The rectangular metal patch 6 of shape slot periphery is connected to two conductors of coupled microstrip line 4, the square of annular groove and annular groove periphery
Shape metal patch constitutes the flute profile ring and Microstrip Loop of coupling probe, and Microstrip Loop is enclosed in the outside of flute profile ring, conversion circuit
Working frequency depends on the resonant frequency of Microstrip Loop and flute profile ring.The coupled microstrip line 4 and rectangular waveguide 1 in vertical state,
Coupling probe stretches into from the narrow side of rectangular waveguide 1 and realizes coupling in rectangular waveguide 1, between coupling probe and waveguide short face 3
Distance is Lshort。
Dielectric substrate 5 is using 5880 dielectric substrates of RT/Duroid, the substrate relative dielectric constant in the present embodiment
2.2, thickness 0.127mm.It is machined with row's metallization VIA 2, the metallization VIA respectively on three sides of dielectric substrate 5
2 may be implemented dielectric substrate 5 in assembly contacts with the good of cavity, and the two is made more firmly to be combined together, golden in addition
Categoryization via 2 is also prevented from the propagation of waveguide higher modes.
In the present embodiment the width W2 of coupled microstrip line 4 and gap (the groove width S2 of microstrip line) be respectively 0.34mm and
0.2mm can provide the differential impedance of 100 Ω.Rectangular waveguide 1 is standard WR-28 rectangular waveguides, and cross sectional dimensions is
7.112mm × 3.556mm, cutoff frequency are 21.09GHz.
For test conversion circuit performance, two same conversion circuits are used and are connected in back-to-back fashion by the present embodiment
Get up (see Fig. 3), input and output are Ka frequency range standard rectangular waveguides.It is imitated by electromagnetic simulation software Ansoft HFSS
After true optimization, optimal parameter size is obtained, (definition of each physical descriptor is shown in that Fig. 2 and attached drawing are said in table shown in table specific as follows
It is bright)：
1 coupling line of table is to the rectilinear conversion circuit specific size of rectangular waveguide
Test result is shown：The working band of the back-to-back conversion circuit is 26.5-40GHz (relative bandwidth 40.6%),
Cover entire Ka frequency ranges.Return loss is more than 15dB in this working frequency range, and insertion loss is less than 1.2dB.The insertion loss
Contain the loss of the coupled microstrip line of 25.5mm long and the loss of two conversion circuits.In the working frequency range, coupling is micro-
Loss with line is about 0.015dB/mm, then its total losses of the coupled microstrip line of 25.5mm long are about 0.383dB, deduct this section
After coupled microstrip line loss, the loss of single conversion circuit is less than 0.41dB.
Table 2 is the comparison of the present embodiment and three kinds of conversion circuits described in background technology.
As can be seen from the table, [ in three kinds of modes;3]The bandwidth of operation of kind of conversion circuit is most wide, has reached 33%, but
Which employs multi-layer PCB circuits, and circuit structure is complicated, and difficulty of processing is big, of high cost.The present embodiment realizes widest work band
Wide (40.6%), while single side PCB construction is used, with the small and at low cost advantage of difficulty of processing.
The above is only the preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, any
The transformation and replacement that are carried out based on technical solution provided by the present invention and inventive concept should all cover the protection model in the present invention
In enclosing.
Claims (1)
1. a kind of coupled microstrip line is to the conversion circuit of rectangular waveguide, it is characterised in that：The conversion circuit is a coupling probe,
Being dug centered on the coupling probe has the rectangular metal patch of annular groove, the annular groove and two conductors of coupled microstrip line it
Between rectangular channel connection, the rectangular metal patch of annular groove periphery is connected to two conductors of coupled microstrip line, annular groove
The flute profile ring and Microstrip Loop of coupling probe, the working frequency of conversion circuit are constituted with the rectangular metal patch of annular groove periphery
It is determined by the resonant frequency of Microstrip Loop and flute profile ring, coupling probe extends vertically into the difference realized in rectangular waveguide in coupled microstrip line
The conversion of merotype and the TE10 main moulds in rectangular waveguide.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610996055.1A CN106549203B (en) | 2016-11-12 | 2016-11-12 | A kind of conversion circuit of coupled microstrip line to rectangular waveguide |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610996055.1A CN106549203B (en) | 2016-11-12 | 2016-11-12 | A kind of conversion circuit of coupled microstrip line to rectangular waveguide |
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| CN106549203A CN106549203A (en) | 2017-03-29 |
| CN106549203B true CN106549203B (en) | 2018-10-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107394330B (en) * | 2017-06-20 | 2019-07-19 | 北京理工大学 | A kind of solid-state circuit-waveguide power synthesizer |
| WO2019142314A1 (en) | 2018-01-19 | 2019-07-25 | 三菱電機株式会社 | Converter and antenna device |
| CN113745787B (en) * | 2021-08-23 | 2022-06-28 | 格兰康希微电子***(上海)有限公司 | Signal converter and microstrip line-waveguide signal conversion device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012147286A (en) * | 2011-01-13 | 2012-08-02 | Toko Inc | Input output connection structure of dielectric waveguide |
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| US7463109B2 (en) * | 2005-04-18 | 2008-12-09 | Furuno Electric Company Ltd. | Apparatus and method for waveguide to microstrip transition having a reduced scale backshort |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012147286A (en) * | 2011-01-13 | 2012-08-02 | Toko Inc | Input output connection structure of dielectric waveguide |
Non-Patent Citations (1)
| Title |
|---|
| A Compact and Broadband Differential Microstrip Line to Rectangular Waveguide Transition Using Dipole Antenna;Ziqiang Yang等;《Journal of Infrared, Millimeter, and Terahertz Waves》;20160630;582–591 * |
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