CN105226367A - Load the high directivity microstrip line directional coupler of delay line - Google Patents
Load the high directivity microstrip line directional coupler of delay line Download PDFInfo
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- CN105226367A CN105226367A CN201510724078.2A CN201510724078A CN105226367A CN 105226367 A CN105226367 A CN 105226367A CN 201510724078 A CN201510724078 A CN 201510724078A CN 105226367 A CN105226367 A CN 105226367A
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- delay line
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- directional coupler
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Abstract
The invention discloses a kind of high directivity microstrip line directional coupler loading delay line, adopt film process technology to be printed on high-dielectric-constant ceramics substrate by conductor belt, comprise input, output, coupled end, isolation end and delay line; Input is communicated with by least one section of delay line with output, and coupled end is communicated with isolation end.This product is strengthened by the coupling of three parts, obtains the required degree of coupling; The whole layer gold in the back side of ceramic substrate covers, and ensure that the high frequency performance of product; The upper surface of input, output, coupled end, isolation end and delay line is all positioned at same plane, is convenient to processing and assembling; The corner of main line and by-pass all does chamfer process and decreases the impact of corner on high frequency performance.Product of the present invention has that structure is simple, volume is little, and the feature that difficulty of processing is low, can be widely used in the micro-assembly line field such as T/R assembly and module in space flight, aviation, radar, electronic countermeasures, microwave communication.
Description
Technical field
The present invention relates to a kind of microstrip line directional coupler of high directivity, be specifically related to a kind of high directivity microstrip line directional coupler being loaded with multistage delay line.
Background technology
Directional coupler is widely used a kind of microwave device in microwave system, and its Main Function is that microwave signal is carried out power division according to a certain percentage, and the quality of its index directly affects the performance of whole system.Miniaturization, the advantage such as integrated that wherein microstrip line directional coupler has due to itself are widely used at microwave circle.Microstrip line directional coupler known at present has multiple design form.A kind of is traditional parallel lines coupling, and this mode is generally all only applicable to weak coupling, and directivity is all poor; Another kind adopts to increase the mode of lamped element to improve directivity in coupled end, and this mode is difficult to the consistency of guarantee lamped element and is difficult to ensure weak coupling and high directivity simultaneously.Directional coupler majority on present domestic and international market adopts traditional waveguiding structure, bulky, or make microstrip line directional coupler at the medium substrate of low-k, and this is all not easy to be integrated in system use.And on the ceramic substrate of high-k, make the volume that microstrip line directional coupler can reduce device greatly, be very suitable for microwave integrated circuit and lithography process manufacture.
Summary of the invention
For problems of the prior art, the invention provides a kind of high directivity microstrip line directional coupler loading delay line, meet the requirement of microwave integrated circuit miniaturization, reduce the volume of coupler, improve the directivity of microstrip line directional coupler.
Technical scheme of the present invention:
Load a high directivity microstrip line directional coupler for delay line, adopt film process technology to be printed on above ceramic substrate by conductor belt (layer gold), comprise input, output, coupled end, isolation end and delay line; Described input is communicated with by least one section of delay line with output; Described coupled end is communicated with isolation end.
Further, the mode that described coupled end is coupled by side and main line carry out Energy Coupling, the Energy transmission of coupled end be by-pass and main line by the first coupling part, the second coupling part, the 3rd coupling part coupled in common and; Product is made to obtain the stronger degree of coupling by the coupling of three coupling parts.
Further, the whole layer gold in the back side of described ceramic substrate covers; Ensure that the good contact on product and ground, thus ensure that the high frequency performance of product.
As preferred technical scheme, described ceramic substrate be more than or equal to 6 high-dielectric-constant ceramics substrate; Thus reduce the volume of coupler.
As preferred technical scheme, the characteristic impedance of described input, output, coupled end, isolation end is 47.5 ~ 52.5 Ω; Provide conveniently for user uses.
As preferred technical scheme, the upper surface of described input, output, coupled end, isolation end and delay line, is all positioned at same plane; Be convenient to processing and assembling, reduce processing request; Further, the corner of main line and by-pass all does chamfer process thus decreases the impact of corner on high frequency performance.
Beneficial effect of the present invention:
In the middle of making film process technology being transplanted to directional coupler of novelty of the present invention, the critical process such as magnetron sputtering, photoetching is adopted to print coupler circuit figure on the ceramic substrate of high-k, and improved the directivity of microstrip line directional coupler by the method loading delay line, the length of delay line is according to the operating frequency of directional coupler and directivity adjustment.Strengthened by the coupling of three coupling parts, obtain the required degree of coupling; The whole layer gold in the back side of ceramic substrate covers, and ensure that the high frequency performance of product; The upper surface of input, output, coupled end, isolation end and delay line is all positioned at same plane, is convenient to processing and assembling; The corner of main line and by-pass all does chamfer process and decreases the impact of corner on high frequency performance.Product of the present invention has that structure is simple, volume is little, and the feature that difficulty of processing is low, can be widely used in the micro-assembly line field such as T/R assembly and module in space flight, aviation, radar, electronic countermeasures, microwave communication.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only one of them embodiment of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is vertical view of the present invention;
Fig. 2 is the degree of coupling test result curve of embodiment 1;
Fig. 3 is the isolation degree test result curve of embodiment 1;
Fig. 4 is the vertical view of embodiment 2;
Fig. 5 is the degree of coupling test result curve of embodiment 2;
Fig. 6 is the isolation degree test result curve of embodiment 2;
In figure: 1-input, 2-output, 3-coupled end, 4-isolation end, 5-delay line, 61-first coupling part; 62-second coupling part, 63-the 3rd coupling part.
Embodiment
For making those skilled in the art understand production technology of the present invention and technique effect in detail, introduce application of the present invention and technique effect further with concrete production instance below.
Embodiment 1
As shown in Figure 1, load the high directivity microstrip line directional coupler of delay line, adopt film process technology to be printed on above ceramic substrate 7 by conductor belt (layer gold), comprise input 1, output 2, coupled end 3, isolation end 4 and delay line 5; Input 1 is communicated with by two sections of delay lines 5 with output 2, and coupled end 3 is communicated with isolation end 4.In order to regulate coupling, the mode that described coupled end 3 is coupled by side and main line carry out Energy Coupling, the Energy transmission of coupled end 3 be by-pass and main line coupling part coupled in common and.In order to obtain the required degree of coupling, this product is strengthened by the coupling of the first coupling part 61, second coupling part 62, the 3rd coupling part 63 3 parts.
The whole layer gold in the back side of described ceramic substrate 7 covers, and ensures that product ensures the high frequency performance of product with the good contact on ground with this.
Further, in order to reduce the volume of coupler, described ceramic substrate is dielectric constant is 9.9, thickness is the aluminium oxide ceramic substrate of 0.5mm.Conveniently user uses, and the characteristic impedance of described input 1, output 2, coupled end 3, isolation end 4 is 47.5 ~ 52.5 Ω, and the live width of input 1, output 2, coupled end 3, isolation end 4 is 0.5mm.
Further, for the ease of processing, assembling and welding gold ribbon, reduce processing request, the upper surface of the upper surface of the upper surface of input 1, the upper surface of output 2, coupled end 3, the upper surface of isolation end 4, delay line 5, be all positioned at same plane, and the corner of main line and by-pass all does chamfer process to reduce the impact of corner on high frequency performance.
Fig. 2 and Fig. 3 is the test curve that embodiment 1 loads the high directivity microstrip line directional coupler of delay line.Therefrom can find out, in 5.2 ~ 5.6GHz frequency range, achieve a high direction directional coupler well.In figure, S11 represents the reflection coefficient of input 1, and S21 represents the transmission coefficient of output 2, and S31 represents the coupling coefficient of coupled end 3, and S41 represents the isolating coefficient of isolation end 4.As can be seen from the curve distribution in figure, the Insertion Loss of this microstrip line directional coupler is less than 0.5dB, and coupling coefficient is 25dB, and fluctuation is less than 0.5dB; Input port reflection is lower than-20dB, and the isolation between output is better than-45dB.
Embodiment 2
As shown in Figure 4, be only with the difference of embodiment 1: described ceramic substrate 7 for dielectric constant be 21, thickness is the ceramic substrate of 0.5mm; The live width of input 1, output 2, coupled end 3, isolation end 4 is 0.21mm; The length of delay line 5, narrowed width.Main line also has corresponding change to the coupling part of by-pass in addition.
Above are only citing.In actual production, delay line 5 can be one or more snippets straightway or other are irregularly shaped.
Fig. 5 and Fig. 6 is the test curve that embodiment 2 loads the high directivity microstrip line directional coupler of delay line.Therefrom can find out, in 1.4 ~ 1.427GHz frequency range, achieve a high direction directional coupler well.In figure, S11 represents the reflection coefficient of input 1, and S21 represents the transmission coefficient of output 2, and S31 represents the coupling coefficient of coupled end 3, and S41 represents the isolating coefficient of isolation end 4.As can be seen from the curve distribution in figure, the Insertion Loss of this microstrip line directional coupler is less than 0.7dB, and coupling coefficient is 21.5dB, and fluctuation is less than 0.5dB; Input port reflection is lower than-25dB, and the isolation between output is better than-60dB.
Design of the present invention is mainly based on the design principle of coupled microstrip line, and its main analytical method is odd-even mode analytical method.When two maskless transmission lines abut against together, due to each transmission line electromagnetic field between interaction, can coupling power be had between transmission line.Usual supposition coupled transmission line works in TEM mould, and this is approximate correct for microstrip line construction.C
11the direct-to-ground capacitance of conductor belt 1 when representing that conductor belt 2 does not exist, C
22the direct-to-ground capacitance of conductor belt 2 when representing that conductor belt 1 does not exist, C
12represent interband electric capacity when earthing conductor does not exist.
For two symmetrical coupling lines, C
11=C
22.
Consider the excitation types that two kinds of coupling line are special, even mould: on two tape conductors, the amplitude of electric current is equal, and direction is identical.Uniconductor line is called even mould electric capacity for the distributed capacitance of bottom surface, represents then have with Ce: even mould electric capacity C
e=C
11=C
22even mode impedance
Strange mould: on two tape conductors, the amplitude of electric current is equal, and direction is contrary.Uniconductor line is called strange mould electric capacity for the distributed capacitance of bottom surface, represents then have with Co: strange mould electric capacity C
o=C
11+ 2C
12=C
22+ 2C
12, odd mode impedance
Electricity wall and magnetic wall are divided into two parts coupling line, only need a research part wherein, so just become the characteristic of the single strange loft of research and even loft, then superpose the characteristic that just can obtain coupling line, and second half, then can come equivalent with the electric wall on the plane of symmetry and magnetic wall boundary condition.Like this, coupling line four port organization is originally reduced to Two-port netwerk structure, can carry out analysis and calculation by transmission line theory.
Product of the present invention has that structure is simple, volume is little, and the feature that difficulty of processing is low, can be widely used in the micro-assembly line field such as T/R assembly and module in space flight, aviation, radar, electronic countermeasures, microwave communication.
Above the technical scheme that the embodiment of the present invention provides is described in detail, apply specific case herein to set forth the principle of the embodiment of the present invention and execution mode, the explanation of above embodiment is only applicable to the principle helping to understand the embodiment of the present invention; Meanwhile, for one of ordinary skill in the art, according to the embodiment of the present invention, embodiment and range of application all will change, and in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. load the high directivity microstrip line directional coupler of delay line, it is characterized in that: adopt film process technology to be printed on by conductor belt above ceramic substrate (7), comprise input (1), output (2), coupled end (3), isolation end (4) and delay line (5); Described input (1) is communicated with by least one section of delay line (5) with output (2); Described coupled end (3) is communicated with isolation end (4).
2. the high directivity microstrip line directional coupler of loading delay line according to claim 1, it is characterized in that: the mode that described coupled end (3) is coupled by side and main line carry out Energy Coupling, the Energy transmission of coupled end (3) be by-pass and main line by the first coupling part (61), the second coupling part (62), the 3rd coupling part (63) coupled in common and.
3. want the high directivity microstrip line directional coupler of the loading delay line described in 1 according to right, it is characterized in that: the whole layer gold in the back side of described ceramic substrate (7) covers.
4. want the high directivity microstrip line directional coupler of the loading delay line described in 1 or 3 according to right, it is characterized in that: the high-dielectric-constant ceramics substrate of described ceramic substrate (7) for being more than or equal to 6.
5. want the high directivity microstrip line directional coupler of the loading delay line described in 1 according to right, it is characterized in that: the characteristic impedance of described input (1), output (2), coupled end (3), isolation end (4) is 47.5 ~ 52.5 Ω.
6. according to the high directivity microstrip line directional coupler of the loading delay line in claim 1-5 described in any one, it is characterized in that: the upper surface of described input (1), output (2), coupled end (3), isolation end (4) and delay line (5), is all positioned at same plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510724078.2A CN105226367A (en) | 2015-10-30 | 2015-10-30 | Load the high directivity microstrip line directional coupler of delay line |
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| CN201510724078.2A CN105226367A (en) | 2015-10-30 | 2015-10-30 | Load the high directivity microstrip line directional coupler of delay line |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107645029A (en) * | 2017-10-24 | 2018-01-30 | 苏州市新诚氏通讯电子股份有限公司 | Aluminium oxide ceramic substrate 30dB coupling pieces |
| CN107799860A (en) * | 2017-10-24 | 2018-03-13 | 苏州市新诚氏通讯电子股份有限公司 | Aluminium nitride 30dB band pin coupling modules |
| CN108037486A (en) * | 2017-12-11 | 2018-05-15 | 广东黑林通信技术有限公司 | A kind of synthesizer for radar row submatrix |
| CN112097815A (en) * | 2020-08-21 | 2020-12-18 | 电子科技大学 | Scattering matrix parameter detection system for microwave sensing |
| CN117081883A (en) * | 2023-10-13 | 2023-11-17 | 北京国科天迅科技股份有限公司 | Directional coupler and data transmission system |
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| CN1747226A (en) * | 2004-09-10 | 2006-03-15 | 华为技术有限公司 | Oriented coupler of coupler wire and production thereof |
| CN101009396A (en) * | 2007-01-18 | 2007-08-01 | 华为技术有限公司 | Directional coupler and the device with the same |
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| CN1747226A (en) * | 2004-09-10 | 2006-03-15 | 华为技术有限公司 | Oriented coupler of coupler wire and production thereof |
| CN101009396A (en) * | 2007-01-18 | 2007-08-01 | 华为技术有限公司 | Directional coupler and the device with the same |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107645029A (en) * | 2017-10-24 | 2018-01-30 | 苏州市新诚氏通讯电子股份有限公司 | Aluminium oxide ceramic substrate 30dB coupling pieces |
| CN107799860A (en) * | 2017-10-24 | 2018-03-13 | 苏州市新诚氏通讯电子股份有限公司 | Aluminium nitride 30dB band pin coupling modules |
| CN107799860B (en) * | 2017-10-24 | 2023-08-15 | 苏州市新诚氏通讯电子股份有限公司 | Aluminum nitride 30dB coupling module with pins |
| CN107645029B (en) * | 2017-10-24 | 2023-08-15 | 苏州市新诚氏通讯电子股份有限公司 | 30dB coupling piece of alumina ceramic substrate |
| CN108037486A (en) * | 2017-12-11 | 2018-05-15 | 广东黑林通信技术有限公司 | A kind of synthesizer for radar row submatrix |
| CN112097815A (en) * | 2020-08-21 | 2020-12-18 | 电子科技大学 | Scattering matrix parameter detection system for microwave sensing |
| CN117081883A (en) * | 2023-10-13 | 2023-11-17 | 北京国科天迅科技股份有限公司 | Directional coupler and data transmission system |
| CN117081883B (en) * | 2023-10-13 | 2024-01-23 | 北京国科天迅科技股份有限公司 | Directional coupler and data transmission system |
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Application publication date: 20160106 |