CN201450093U - Microstrip coupling line directional coupler applied in UHF frequency range - Google Patents
Microstrip coupling line directional coupler applied in UHF frequency range Download PDFInfo
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- CN201450093U CN201450093U CN2009200626414U CN200920062641U CN201450093U CN 201450093 U CN201450093 U CN 201450093U CN 2009200626414 U CN2009200626414 U CN 2009200626414U CN 200920062641 U CN200920062641 U CN 200920062641U CN 201450093 U CN201450093 U CN 201450093U
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- directional coupler
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Abstract
The utility model discloses a microstrip coupling line directional coupler applied in UHF frequency range, with features of small volume, wide bandwidth, small in-band fluctuation, low coupling degree and good debugging performance. The directional coupler can realize wideband directional coupling in UHF frequency range, solve the problem that large in-band fluctuation of the frequency range appears in the other directional coupler and increase the precision of the coupling detection. The directional coupler comprises a screening box, a medium plate mounted in the screening box, a screening cover for making the medium plate cover in the screening box; a pair of coupling lines tortuously which are laid on the medium plate. A height-adjustment post is arranged on the screening box and an installation hole is correspondingly arranged on the medium plate and the post fixedly connects the screening box, the medium plate and the active screening cover together by the installation hole.
Description
Technical field
The utility model relates to the passive microwave circuit design field, particularly a kind of big bandwidth of realization miniaturization and little directional coupler of passband fluctuation that is applied in uhf band.
Background technology
Directional coupler is a kind of power divider with directivity, is used for that the radiofrequency signal that main radio-frequency transmission line transmits is coupled out a part and comes, and is mainly used in power detection.Microstrip coupled line directional coupler is generally four port networks, and first port is main radio-frequency (RF) signal input end, and second port is straight-through end, and the transmission line between first port and second port is a main transmission line; Another transmission line is secondary transmission line, i.e. coupling line, and adjacent with first port in the secondary transmission line is coupling port, the other end is an isolated port.The technical indicator of microstrip coupled line directional coupler mainly contains the passband fluctuation and the directivity of the degree of coupling, bandwidth of operation, insertion loss, the degree of coupling.For uhf band (for example 225MHz-512MHz), the difficulty that the design of microstrip coupled line directional coupler exists has the following aspects: one, the bandwidth of operation of superoctave; Two, undersized requirement; Three, the passband fluctuation of the degree of coupling is little; Four, debugging property.Describe this four unapproachable reasons in aspect below respectively in detail.
Be difficult to realize the bandwidth of operation of superoctave: if working frequency range is 225MHz-512MHz, bandwidth of operation will surpass octave, for microstrip line directional coupler, the length of single-unit coupling line is the quarter-wave of centre frequency, and the bandwidth of operation of the microstrip coupled line of single-unit is not wide.For widening frequency band, often the technological means that adopts is that directional coupler is made the microstrip coupled line of more piece; But can bring the another one problem like this, be exactly oversize.
Be difficult to reach undersized requirement:, wish to do little to the size of microstrip coupled line directional coupler from practical angle as far as possible.But for the microstrip coupled line directional coupler of uhf band, wavelength is longer, is about 1 meter; In order to realize the broadband coupling, must adopt the microstrip coupled line of more piece, size will be very big like this.With the working frequency range is that 225MHz-512MHz is an example, calculates with intermediate frequency 368.5MHz, and wavelength is 814mm, the length of the microstrip coupled line of every joint is 203.5mm, then the length of the microstrip coupled line of three joints is 610.6mm, and obviously, the practicality of the directional coupler of length is very poor like this.
It is little to be difficult to reach degree of coupling passband fluctuation: directional coupler is mainly used in power detection, and the size of degree of coupling passband fluctuation has directly influenced the precision that detects.The power detection control device of a use directional coupler for example is if the degree of coupling passband fluctuation of coupler is ± 0.5dB that then the error of the power that obtains through its detection is ± 0.5dB; Disregard other errors, the passband fluctuation of the power output that causes through this directional coupler has just reached 1dB.In the application scenario of a lot of power detection controls, the error of this degree is beyond affordability.
Be difficult to realize debugging property:, because the precision of emulation is limited, and the error of practical situation and simulation model, be difficult to guarantee that result that actual fabrication is come out just can reach the index of design in case the microstrip line fabric swatch makes after the plate.At this moment because the size of PCB is fixed, the debugging property of directional coupler is very poor.
The utility model content
In order to solve above-mentioned existing in prior technology problem, the purpose of this utility model is to provide a kind of microstrip coupled line directional coupler that is applied to uhf band, can satisfy big bandwidth, volume is little, passband fluctuation is little requirement, and possess the lower degree of coupling and good debugging property.
The purpose of this utility model adopts following technical scheme to realize: be applied to the microstrip coupled line directional coupler of uhf band, comprise shielding box, be installed in dielectric-slab in the shielding box, dielectric-slab is covered on screening cover in the shielding box; Described dielectric-slab top layer complications are being laid a pair of coupling line, and bottom shop copper forms ground plane; Described shielding box is provided with anchor post, and dielectric-slab is provided with installing hole accordingly, is provided with adjustable for height adjustable prop between dielectric-slab and the screening cover, and adjustable prop and anchor post are fixed together shielding box, dielectric-slab, screening cover by installing hole.
Described a pair of coupling line is made up of all identical microstrip coupled line of first segment of live width and line length, the second microstrip coupled line of joint and the microstrip coupled line of the 3rd joint, and is two serpentine complications and is laid on the dielectric-slab.
Described a pair of coupling line is centrosymmetric with the center of the microstrip coupled line of second joint; The main transmission line of microstrip coupled line of first segment and the microstrip coupled line of the 3rd joint is identical with the gap between the coupling line, and greater than the main transmission line of the microstrip coupled line of second joint and the gap between the coupling line.
The length of the microstrip coupled line of described first segment, the second microstrip coupled line of joint and the microstrip coupled line of the 3rd joint is the quarter-wave of the front end frequency of working band.
Described dielectric-slab is the printed circuit pcb board.
Described a pair of coupling line isolation end by ground connection behind resistance, straight-through termination matched load.
The resistance of described isolation end institute connecting resistance is 50 ohm, and the impedance of input, straight-through end, coupled end and isolation end is 50 ohm.
Compared with prior art, the utlity model has following beneficial effect and advantage: the bandwidth of operation of directional coupler that adopted the microstrip coupled line broadening of more piece, can realize the wideband directional coupling in the uhf band, solve the big problem of existing directional coupler degree of coupling passband fluctuation in this frequency range, improved the precision that coupling detects; Adopt the structure of tortuous wiring, solved the excessive problem of the microstrip coupled linear dimension of uhf band more piece, thereby had the little advantage of volume; Screening cover adopts mobilizable structure, makes that screening cover is adjustable to the distance of microstrip coupled line, has solved microstrip coupled line and has made the problem of debugging property difference afterwards.
Description of drawings
Fig. 1 is PCB fabric swatch figure of the present utility model;
Fig. 2 is a structural representation of the present utility model;
Fig. 3 is two-port test result figure of the present utility model;
Fig. 4 utilizes the utility model to carry out the result schematic diagram of the uhf band radio station power back-off of power detection.
Embodiment
Be example with the microstrip coupled line directional coupler that is applied to radio station (operating frequency is 225MHz-512MHz) power output detection below, and in conjunction with Figure of description, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment
As shown in Figure 1, 2, the utility model comprises shielding box 1, is installed in dielectric-slab 6 in the shielding box 1, dielectric-slab 6 is covered on screening cover 5 in the shielding box 1; Wherein complications are being laid a pair of coupling line 2 on the dielectric-slab 6, and this has four ports to coupling line 2, are respectively input 21, coupled end 22, isolation end 23, straight-through end 24; Shielding box 1 is provided with four highly fixing anchor posts 7, dielectric-slab 6 is provided with four installing holes 4 accordingly, be provided with Height Adjustable adjustable prop 3 between dielectric-slab 6 and the screening cover 5, adjustable prop 3 and anchor post 7 are fixed together shielding box 1, dielectric-slab 6, screening cover 5 by installing hole 4.
In the present embodiment, dielectric-slab 6 preferred printed circuit pcb boards; Adjustable prop 3 preferred supporting studs; Coupling line 2 is made up of all identical microstrip coupled line of three joints of live width and line length, and is two serpentine complications and is laid on the printed circuit pcb board.
Be example so that to design working band be 225MHz-512MHz, size less than 95*55mm, passband fluctuation less than the directional coupler that the degree of coupling in ± 0.4dB, the band is about 20dB below, design process of the present utility model is described, it comprises the steps:
(1) adopt the microstrip coupled line of three joints, the live width of the microstrip coupled line of three joints is identical, and line length is identical, and the AB section is a first segment, and the BC section is second joint, and the CD section is the 3rd joint, as shown in Figure 1.Coupling line 2 is centrosymmetric with the center of the microstrip coupled line of second joint; The main transmission line of microstrip coupled line of first segment and the microstrip coupled line of the 3rd joint is identical with the gap between the coupling line, and greater than the main transmission line of the microstrip coupled line of second joint and the gap between the coupling line.Each saves the variation in gap between the microstrip coupled line and adopts even gradual transition.The length of the microstrip coupled line of every joint is taken as the quarter-wave of the front end frequency (as near the frequency the 512MHz) of working band, and the total length of three joints is about four/three-wavelength, about 324mm.
(2) adopt the tortuous method that connects up, determine the integral layout of wiring, the microstrip coupled line complications of three joints that length is about 324mm are distributed in the printed board that area is 89*49mm, be divided into 5 sections and be parallel to long limit, be the shape that two serpentines are stitched together from top to bottom, the corner keeps seamlessly transitting with arc transition; The gap is constant between same joint interior maintenance main transmission line and the coupling line, the microstrip coupled line of first segment, main transmission line is long slightly than coupling line, the microstrip coupled line of second joint, main transmission line and Coupled Line Length of Band equate, the main transmission line of the microstrip coupled line of the 3rd joint is short slightly than coupling line, the total main transmission line and the equal in length of coupling line.The center of the whole relative coupling line of wiring is the symmetry wiring, and notices that input port, straight-through end and coupling port are placed on the edge of pcb board.
(3) material of microstrip coupled line adopts the higher polytetrafluoroethylene (ε of relative dielectric constant
r=2.32), thickness of slab is chosen as 1mm; The characteristic impedance of microstrip line comprises the input of main transmission line, the impedance of straight-through end, and the coupled end of coupling line and isolation end impedance are 50 ohm; The grounding through resistance of isolating one 50 ohm of terminations, characteristic impedance of coupling termination are 50 ohm radio frequency line output; Large tracts of land shop, microstrip line bottom surface (being the bottom of pcb board) copper forms ground plane, links to each other with shielding box by installing hole.Under port Impedance remained 50 ohm condition, the width of microstrip line was less, helps reducing the size that takies like this.
(4) set up model with the electromagnetism simulation software, with passband fluctuation in the 225MHz-512MHz frequency band less than ± 0.4dB, the about 20dB of the degree of coupling is that target is optimized design, the size of optimization mainly comprise the width of microstrip line, respectively save gap between the microstrip line, respectively save the length, microstrip line of microstrip line distance to screening cover.
(5) result according to emulation carries out PCB layout, increases installing hole and ground pad simultaneously; Design and produce a shielding box, four fixed installation holes, in shielding box broadside left and right side respectively perforate as the outlet of input and output radio frequency plug and leave fixing hole.Isolation end connects ground connection with one 50 Ohmic resistances, and input, straight-through end, coupled end characteristic impedance are that 50 ohm radio frequency line is drawn, and are installed in the shielding box.PCB layout as shown in Figure 1.
(6) directional coupler is installed on shielding box, face up, input, straight-through end and coupled end are drawn the shielding box outside with radio frequency line and radio frequency plug, confirm that the ground level of directional coupler well contacts with shielding box by installing hole, isolate termination one 50 Ohmic resistance ground connection.Support movable screening cover (available another directional coupler covers as portable shielding) with four adjustable props and be installed on (ground level of movable screening cover is towards directional coupler) on the directional coupler, the external shield lid of installing shielding box at last gets final product, and the directional coupler after installing as shown in Figure 2.In the present embodiment, adjustable prop is selected Height Adjustable supporting studs.
(7) because the adjustable height of the supporting studs of movable screening cover, so just can change distance between movable screening cover and the microstrip coupled line by the height of adjusting four double-screw bolts to change microstrip coupled line top electromagnetic field distribution, thereby regulate the interior coupling of the band flatness of microstrip coupled line directional coupler, four supporting studs all can freely be adjusted height, increased the degree of freedom of regulating, optimum result often appears under the height of four supporting studs situation inequality, at this moment movable screening cover also is not parallel to microstrip coupled line. and be screwed after reaching requirement, install the external shield lid of shielding box again; Wherein four double-screw bolts can put a plurality of packing rings with elongated double-screw bolt on the double-screw bolt between directional coupler and the movable screening cover, are installed in the installing hole of shielding box, realize the adjusting of supporting studs height by the quantity of folded packing ring in the middle of regulating.
(8) install screening cover after, straight-through termination 50 ohm load, with coupled characteristic in the dual-port band of network analyzer test input and coupled end, (7) are regulated between movable screening cover and the microstrip coupled line apart from debugging set by step, up to reaching design object, debug results as shown in Figure 3.Curve S 21 is the transfer curve from the input to the coupled end among Fig. 3, and the longitudinal axis is the coordinate corresponding to curve S 21.As seen the degree of coupling in the 225-512MHz band is L=-|S
12|=22.17 ± 0.27dB well meets design requirement.After debugging finishes, movable shielding box is fixed, and installed screening cover.
Utilize microstrip coupled line directional coupler of the present utility model to carry out the result of the uhf band radio station power back-off of power detection, as shown in Figure 4.As can be seen from Figure 4, use directional coupler of the present utility model to carry out that the flatness of radio station power output is 44.76 ± 0.58dB after the power back-off, satisfy the requirement of the power output flatness in radio station, shown that directional coupler performance of the present utility model reaches designing requirement.The straight-through end of main transmission line can be installed high-power resistance as load according to user demand in shielding box, also can draw the shielding box outside by radio frequency line and connect the antenna even load.The ground of noting input, straight-through end, radio frequency line that coupled end is drawn and radio frequency plug wants and the ground level of directional coupler keeps good electrical contact.
The foregoing description is the utility model preferred implementation; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection range of the present utility model.
Claims (7)
1. be applied to the microstrip coupled line directional coupler of uhf band, it is characterized in that: comprise shielding box, be installed in dielectric-slab in the shielding box, dielectric-slab is covered on screening cover in the shielding box; Described dielectric-slab top layer complications are being laid a pair of coupling line, and bottom shop copper forms ground plane; Described shielding box is provided with anchor post, and dielectric-slab is provided with installing hole accordingly, is provided with adjustable for height adjustable prop between dielectric-slab and the screening cover, and adjustable prop and anchor post are fixed together shielding box, dielectric-slab, screening cover by installing hole.
2. the microstrip coupled line directional coupler that is applied to uhf band according to claim 1, it is characterized in that: described a pair of coupling line is made up of all identical microstrip coupled line of first segment of live width and line length, the second microstrip coupled line of joint and the microstrip coupled line of the 3rd joint, and is two serpentine complications and is laid on the dielectric-slab.
3. the microstrip coupled line directional coupler that is applied to uhf band according to claim 2 is characterized in that: described a pair of coupling line is centrosymmetric with the center of the microstrip coupled line of second joint; The main transmission line of microstrip coupled line of first segment and the microstrip coupled line of the 3rd joint is identical with the gap between the coupling line, and greater than the main transmission line of the microstrip coupled line of second joint and the gap between the coupling line.
4. according to claim 2 or the 3 described microstrip coupled line directional couplers that are applied to uhf band, it is characterized in that: the length of the microstrip coupled line of first segment, the second microstrip coupled line of joint and the microstrip coupled line of the 3rd joint is the quarter-wave of the front end frequency of working frequency range.
5. the microstrip coupled line directional coupler that is applied to uhf band according to claim 1, it is characterized in that: described dielectric-slab is the printed circuit pcb board.
6. the microstrip coupled line directional coupler that is applied to uhf band according to claim 1 is characterized in that: the isolation end of described a pair of coupling line is by ground connection behind resistance, straight-through termination matched load.
7. the microstrip coupled line directional coupler that is applied to uhf band according to claim 6 is characterized in that: the resistance of described isolation end institute connecting resistance is 50 ohm, and the impedance of input, straight-through end, coupled end and isolation end is 50 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200626414U CN201450093U (en) | 2009-08-20 | 2009-08-20 | Microstrip coupling line directional coupler applied in UHF frequency range |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009200626414U CN201450093U (en) | 2009-08-20 | 2009-08-20 | Microstrip coupling line directional coupler applied in UHF frequency range |
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| CN201450093U true CN201450093U (en) | 2010-05-05 |
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| CN2009200626414U Expired - Lifetime CN201450093U (en) | 2009-08-20 | 2009-08-20 | Microstrip coupling line directional coupler applied in UHF frequency range |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151594A (en) * | 2013-03-26 | 2013-06-12 | 成都安擎微波科技有限责任公司 | Directional coupler |
| CN103311631A (en) * | 2013-05-11 | 2013-09-18 | 中国科学技术大学 | Low-temperature directional coupler |
| CN103344806A (en) * | 2013-06-21 | 2013-10-09 | 中国电子科技集团公司第四十一研究所 | Dual-orientation electrical bridge |
| CN104993205A (en) * | 2015-07-06 | 2015-10-21 | 电子科技大学 | Microstrip fold line directional coupler |
| CN105226366A (en) * | 2015-10-09 | 2016-01-06 | 武汉中元通信股份有限公司 | The banded three-dimensional domain topological structure of a kind of U/V band high-power broadband dual directional coupler |
| CN108493563A (en) * | 2018-03-12 | 2018-09-04 | 锐石创芯（深圳）科技有限公司 | Radio-frequency front-end and electronic equipment comprising it |
-
2009
- 2009-08-20 CN CN2009200626414U patent/CN201450093U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151594A (en) * | 2013-03-26 | 2013-06-12 | 成都安擎微波科技有限责任公司 | Directional coupler |
| CN103151594B (en) * | 2013-03-26 | 2015-09-09 | 成都安擎微波科技有限责任公司 | A kind of directional coupler |
| CN103311631A (en) * | 2013-05-11 | 2013-09-18 | 中国科学技术大学 | Low-temperature directional coupler |
| CN103311631B (en) * | 2013-05-11 | 2016-01-06 | 中国科学技术大学 | A kind of low-temperature directional coupler |
| CN103344806A (en) * | 2013-06-21 | 2013-10-09 | 中国电子科技集团公司第四十一研究所 | Dual-orientation electrical bridge |
| CN103344806B (en) * | 2013-06-21 | 2015-12-23 | 中国电子科技集团公司第四十一研究所 | A kind of amphiorentation electric bridge |
| CN104993205A (en) * | 2015-07-06 | 2015-10-21 | 电子科技大学 | Microstrip fold line directional coupler |
| CN105226366A (en) * | 2015-10-09 | 2016-01-06 | 武汉中元通信股份有限公司 | The banded three-dimensional domain topological structure of a kind of U/V band high-power broadband dual directional coupler |
| CN105226366B (en) * | 2015-10-09 | 2018-09-21 | 武汉中元通信股份有限公司 | A kind of band-like three-dimensional domain topological structure of U/V band high-powers broadband dual directional coupler |
| CN108493563A (en) * | 2018-03-12 | 2018-09-04 | 锐石创芯（深圳）科技有限公司 | Radio-frequency front-end and electronic equipment comprising it |
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