CN103762406B - A kind of broadband falls into the band ferrite isolator that declines - Google Patents
A kind of broadband falls into the band ferrite isolator that declines Download PDFInfo
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- CN103762406B CN103762406B CN201410006154.1A CN201410006154A CN103762406B CN 103762406 B CN103762406 B CN 103762406B CN 201410006154 A CN201410006154 A CN 201410006154A CN 103762406 B CN103762406 B CN 103762406B
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- ferrite
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Abstract
The invention discloses a kind of broadband and fall into the band ferrite isolator that declines.The inventive method fall into decline band junction circulator basis on, from ferrite sample, extend three ferrite arms, ferrite arm be covered with little " Y type " microstrip line of opening a way.Little " Y " type open-circuit line is in fact by three open-circuit lines, the reactance of centre junction port Impedance part is balanced out, make the part of only remaining resistance in centre junction equiva lent impedance, be beneficial to coupling in broadband range, expand the bandwidth of operation that accessible site falls into formula isolator.
Description
Technical field
The invention belongs to radio circuit communication technical field, relate to a kind of broadband and fall into the band ferrite isolator that declines.
Background technology
Microwave ferrite isolator is a kind of passive device with microwave unidirectional transmission property, is applied in various passive, active microwave circuits module, extension set, complete machine, play inter-stage isolation, prevent from harassing, impedance matching, the effect such as decoupling.As: add in amplifier chain module front end the noise that microwave ferrite isolator can reduce module; Adding microwave ferrite isolator at power amplifier end prevents module from burning; In power splitter, coupler circuit, add microwave ferrite isolator play decoupling effect, can harass by anti-stop signal.In the last few years, along with the development of microwave&millimeter-wave IC, the requirement of ferrite device is turned to gradually to the miniaturization being easy to be connected with integrated circuit, integrated, broadband direction.At present, ferrite circulator or the isolator that can meet integrated requirement have several version below: full-magnetic, inserted, full-magnetic, eclipsed form and fall into formula (Dropin).First three plants the device of version, and centre junction is by very thin ferrite sample composition, so demagnetizing factor is in the height direction very large, also just higher to the requirement of additional permanent bias field, this brings very large difficulty with regard to giving the design of external magnetic circuit.And the version falling into formula just in time can solve this difficulty, it, by increasing the height of centre junction, makes required additional permanent bias field greatly reduce, and therefore this version is specially adapted to the development integrated ferrite circulator of millimeter wave or isolator.But the routine reported in the early time falls into the performance of formula circulator and bad, its frequency band is not wide, and isolation is also lower, still has a lot of problem.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, propose a kind of broadband and fall into the band ferrite isolator that declines.
A kind of broadband of the present invention falls into the band ferrite isolator that declines, and comprises the microstrip line on microwave circuit medium substrate, permanent magnet, insulating barrier, absorbing load, ferrite sample and ferrite.
Described ferrite sample is made up of integrated centre junction, three ferrite arms and three ferrite slopes; Cylindrical structural is become at described center; Three ferrite arms are rectangular structure, are evenly distributed on outside centre junction and with the columniform lateral surface of centre junction and pass through mutually, in little " Y " type structure; Three ferrite slopes are a triangular prism structure laterally placed, and are evenly distributed on respectively between three ferrite arms, and pass through mutually with the columniform lateral surface of centre junction, in large " Y " type structure.Be with the structure of two " Y " types, be referred to as " two Y knot " wherein in large " Y " type structure the long and wide upper surface being greater than little " Y " type structural iron oxysome arm respectively of upper surface on ferrite slope to grow and wide;
Ferrite sample is bonded on microwave circuit medium substrate; Then insulating barrier and permanent magnet on the back side of microwave circuit medium substrate bonds successively, the radius of insulating barrier and permanent magnet is identical with centre junction radius, then be covered with microstrip line at ferrite sample upper surface, absorbing load be attached to one of them ferrite tiltedly on end microstrip line on.
Described ferrite specimen material is YIG gyromagnetic material;
The gradient on described ferrite slope is 30 °;
Described absorbing load is film absorption load;
Described insulating layer material is polytetrafluoroethylene;
Described microstrip line material is copper.
" two Y knot " structure is applied in and falls into formula microstrip isolator by the present invention, and inventive point of the present invention is to improve falling into the band spacer structures that declines.
Beneficial effect: the present invention adds little " Y " type open-circuit line outside centre junction, offset centre junction reaction component, only leave active component, recycle large " Y " type microstrip line and carry out impedance transformation, microstrip isolator part can be operated in the microwave radio integrated circuit of wider working frequency range.
Accompanying drawing explanation
Centered by Fig. 1, knot adds the equivalent circuit diagram of Y type open-circuit line;
Fig. 2 is vertical view and the plan view of isolator;
Fig. 3 is the three-dimensional structure diagram of isolator.
Embodiment
As shown in Figure 2 and Figure 3: a kind of broadband of the present invention falls into the band ferrite isolator that declines, and comprises the microstrip line on microwave circuit medium substrate, permanent magnet, insulating barrier, absorbing load, ferrite sample and ferrite.
First fire ferrite sample, ferrite sample is become by integrated centre junction, three ferrite arms and three ferrite slopes; Cylindrical structural is become at described center, and three ferrite arms are evenly distributed on outside centre junction, and three ferrite slopes are evenly distributed between three ferrite arms respectively.
Ferrite sample is bonded on microwave circuit medium substrate; Then insulating barrier and permanent magnet on the back side of microwave circuit medium substrate bonds successively, the radius of insulating barrier and permanent magnet need be identical with centre junction radius, then microstrip line is covered with at ferrite sample upper surface, microstrip line on ferrite arm is the open-circuit line be connected in parallel on centre junction, microstrip line on ferrite slope is used for mating centre junction impedance and external circuit input and output impedance, and absorbing load is attached to the 3rd end ferrite slope end.
Described Ferrite Material is YIG gyromagnetic material;
The gradient on described ferrite sample slope is 30 °;
Described absorbing load is film absorption load;
Described insulating layer material is polytetrafluoroethylene;
Described microstrip line material is copper.
Centered by isolator groundwork region, knot is divided, and in centre junction region, by adjusting the size of centre junction and thickness, makes ferrite create nonreciprocal effect under the effect of additional Constant charge soil, i.e. annular effect, the first annular condition of Here it is circulator; Centre junction is equivalent to a resonator, its equiva lent impedance usually not with external interface impedance matching, usual use angle is that three section of 4/ λ wave microstrip bundle of lines centre junction equiva lent impedance of the one-tenth " Y type " of 120 ° matches on the 50 Ω microstrip lines that are attached thereto, this method effectively can improve the performance of isolator and expand bandwidth, be called as the additional anti-technology of knot, this is also the second annular condition that circulator can work.Learnt by the second annular condition, if Broadband Matching technology can be adopted to make centre junction equiva lent impedance and 50 ohm microstrip lines matching, just can realize broadband isolator.Though conventional Broadband Matching technology effectively can be expanded bandwidth as more piece 4/ λ wavelength or other length microstrip lines but size can be caused to increase, and only rely on more piece impedance transformation cannot reach the bandwidth of frequency multiplication or even super frequency multiplication.
The method of design broadband isolator, except adopting the additional anti-technology of knot of more piece impedance transformation etc., has in knot and adds anti-technology.The present invention is mainly applied to falls into formula structure isolator by adding anti-technology in knot.Two Y junction structure combines to finish in outer and knot and adds anti-technology, bandwidth is expanded further.The three sections of impedance transformation line reverse side tied in large " Y type " add three open-circuit lines, and two Y knot microstrip circulator mainly adopts in knot and adds anti-technology, centre junction and little Y type open-circuit line equivalent parallel, equivalent circuit Fig. 1.The admittance of centre junction equivalent electric circuit is: G
j=G
r+ j ω C
1+ 1/j ω L
1, it is G that little Y ties open-circuit line equivalent admittance
y=j ω C
2+ 1/j ω L
2, the input admittance G of equivalence
1equal G
jwith G
ysum, that is: G
1=G
r+ j ω C
1+ 1/j ω L
1+ j ω C
2+ 1/j ω L
2=G
r+ j ω (C
1+ C
2-1/L
1-1/L
2), by regulating the size of open-circuit line, make j ω (C
1+ C
2-1/L
1-1/L
2) item equals 0, namely three open-circuit lines balance out the reactance of port Impedance part, and the part of only remaining resistance in impedance, for outside coupling brings very large convenience.Propose a kind of two Y falling into the band junction circulator that declines that are applied in and tie design, the size tied by adjusting size Y, adjustment centre junction size and thickness, match centre junction equiva lent impedance on 50 Ω in bandwidth.This supports the method expanded and fall into the band junction circulator bandwidth that declines theoretically.Little Y knot is in fact by three open-circuit lines, the reactance of centre junction port Impedance part is balanced out, and makes the part of only remaining resistance in centre junction equiva lent impedance, is beneficial to coupling in broadband range.And the 1 and 2 port of large Y knot is connected respectively to input and output after adopting more piece impedance transformation, 3 ports connect absorbing load, the more piece impedance section of large Y knot is deposited on ferrite sample, and ferrite sample has higher dielectric constant (usually more than 13.5), this also contributes to the miniaturization of device, is beneficial to integrated.In this way, make isolator convenient integrated with radio circuit, obtain wider bandwidth simultaneously.
Claims (6)
1. broadband falls into the band ferrite isolator that declines, and comprises the microstrip line on microwave circuit medium substrate, permanent magnet, insulating barrier, absorbing load, ferrite sample and ferrite;
Described ferrite sample is made up of integrated centre junction, three ferrite arms and three ferrite slopes; Cylindrical structural is become at described center; Three ferrite arms are rectangular structure, are evenly distributed on outside centre junction and with the columniform lateral surface of centre junction and pass through mutually, in little " Y " type structure; Three ferrite ramp structures are identical, and each ferrite slope is a triangular prism structure laterally placed, and is evenly distributed on respectively between three ferrite arms, and passes through mutually with the columniform lateral surface of centre junction, in large " Y " type structure; Be with the structure of two " Y " types, be referred to as " two Y knot ", wherein in large " Y " type structure, the long and wide upper surface being greater than little " Y " type structural iron oxysome arm respectively of the upper surface on ferrite slope is grown and wide;
Ferrite sample is bonded on microwave circuit medium substrate; Then insulating barrier and permanent magnet on the back side of microwave circuit medium substrate bonds successively, the radius of insulating barrier and permanent magnet is identical with centre junction radius, then be covered with microstrip line at ferrite sample upper surface, absorbing load is attached on the end microstrip line on one of them ferrite slope.
2. a kind of broadband according to claim 1 falls into the band ferrite isolator that declines, and it is characterized in that: described ferrite specimen material is YIG gyromagnetic material.
3. a kind of broadband according to claim 1 falls into the band ferrite isolator that declines, and it is characterized in that: the gradient on described ferrite slope is 30 °.
4. a kind of broadband according to claim 1 falls into the band ferrite isolator that declines, and it is characterized in that: described absorbing load is film absorption load.
5. a kind of broadband according to claim 1 falls into the band ferrite isolator that declines, and it is characterized in that: described insulating layer material is polytetrafluoroethylene.
6. a kind of broadband according to claim 1 falls into the band ferrite isolator that declines, and it is characterized in that: described microstrip line material is copper.
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| CN103762406B true CN103762406B (en) | 2015-11-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104241791B (en) * | 2014-09-11 | 2017-02-15 | 电子科技大学 | Application of micro-strip interval design to substrate integrated waveguide circulator |
| CN108767389A (en) * | 2018-09-05 | 2018-11-06 | 北京无线电测量研究所 | A kind of E surface waves lead junction type ferrite isolator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4749966A (en) * | 1987-07-01 | 1988-06-07 | The United States Of America As Represented By The Secretary Of The Army | Millimeter wave microstrip circulator |
| US5180997A (en) * | 1991-10-24 | 1993-01-19 | The United States Of America As Represented By The Secretary Of The Army | Microstrip high reverse loss isolator |
| CN101621148A (en) * | 2009-05-27 | 2010-01-06 | 深圳市华扬通信技术有限公司 | Circulator |
| CN102938484A (en) * | 2012-11-22 | 2013-02-20 | 彭龙 | Symmetrically-slotted double-Y junction microstrip ferrite circulator |
| CN203839492U (en) * | 2014-01-06 | 2014-09-17 | 杭州电子科技大学 | Broadband drop-in type microstrip ferrite isolator |
-
2014
- 2014-01-06 CN CN201410006154.1A patent/CN103762406B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4749966A (en) * | 1987-07-01 | 1988-06-07 | The United States Of America As Represented By The Secretary Of The Army | Millimeter wave microstrip circulator |
| US5180997A (en) * | 1991-10-24 | 1993-01-19 | The United States Of America As Represented By The Secretary Of The Army | Microstrip high reverse loss isolator |
| CN101621148A (en) * | 2009-05-27 | 2010-01-06 | 深圳市华扬通信技术有限公司 | Circulator |
| CN102938484A (en) * | 2012-11-22 | 2013-02-20 | 彭龙 | Symmetrically-slotted double-Y junction microstrip ferrite circulator |
| CN203839492U (en) * | 2014-01-06 | 2014-09-17 | 杭州电子科技大学 | Broadband drop-in type microstrip ferrite isolator |
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| CN103762406A (en) | 2014-04-30 |
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Effective date of registration: 20160506 Address after: The Poplar Street of Hangzhou city in Zhejiang province 310018 Hangzhou economic and Technological Development Zone No. 6 Street No. 452 Building 2 room D2012-D2017 Patentee after: HANGZHOU CANAANTEK COMMUNICATION TECHNOLOGY CO., LTD. Address before: Hangzhou City, Zhejiang province 310018 Xiasha Higher Education Park No. 2 street Patentee before: Hangzhou Electronic Science and Technology Univ |