CN105304992B - Low insertion loss automatic biasing micro-strip circulator based on Magnetic Nanowire Arrays - Google Patents
Low insertion loss automatic biasing micro-strip circulator based on Magnetic Nanowire Arrays Download PDFInfo
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- CN105304992B CN105304992B CN201510612717.6A CN201510612717A CN105304992B CN 105304992 B CN105304992 B CN 105304992B CN 201510612717 A CN201510612717 A CN 201510612717A CN 105304992 B CN105304992 B CN 105304992B
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Abstract
Low insertion loss automatic biasing micro-strip circulator based on Magnetic Nanowire Arrays, belong to microwave passive component field, the present invention includes hexagonal prisms dielectric layer, metallic bottom electrode and the center knot that there is cylindrical body through-hole at micro-strip Y knot matched line, center, it is characterized in that, the cylindrical center knot includes top insulating layer and bottom insulating layer, and at least two layers of nano-wire array layer between top insulating layer and bottom insulating layer, it is air layer between adjacent nano-array layer.Circulator centre junction of the present invention uses three layers of Magnetic Nanowire Arrays layer deposited with porous alumina formwork, each interlayer is separated with air layer, the purpose for reducing centre junction overall dielectric constant is realized, there is low insertion loss and high isolation in microwave frequency band X-band.
Description
Technical field
The invention belongs to microwave passive component fields, and in particular to a kind of to apply the self-bias on microwave integrated circuit
It sets, the design of the microwave circulators of low insertion loss.
Background technique
Circulator is one of device indispensable in microwave circuit system, is a kind of to have the characteristics that the multiterminal of directional transmissions
Port irreversible device.The developing direction of circulator is miniaturization, high band, broadband.Traditional ferrite toroidal device can not
It realizes automatic biasing, is both needed to additional permanent magnet usually to provide bias-field, this seriously constrains the development of circulator miniaturization.Cause
This, has larger anisotropy field and larger remanence ratio, and the magnetic material that can be realized automatic biasing has received widespread attention.Wherein
Based on nanotechnology preparation soft magnetism nano-material because have following advantage become circulator design new direction: 1, with compared with
Big shape anisotropy field can make magnetic moment reach unanimity on nanowire length direction to realize the effect of automatic biasing；2,
With biggish saturation magnetization, higher frequency section can apply to；Although 3, soft magnetic materials is mostly good conductor, because of nano wire
Geometric dimension be less than skin depth and have lesser eddy-current loss；4, the nano wire of preparation different geometrical size can be passed through
With material category (such as Fe, Co, Ni and its alloy) Lai Tuokuan working frequency range.
Currently, vast majority of people selects porous alumina formwork (AAO template) and electrochemical deposition method to prepare alloy type
Magnetic Nanowire Arrays.Because this method has mature preparation process, the nano-wire array of high-sequential can be obtained, and
The diameter and length of magnetic nanometer can be adjusted within a large range.Further, since alumina formwork material is with low
Dielectric loss, this to become the perfect medium material for developing novel automatic biasing magnetism microwave device based on AAO nanoporous template
Material.
The existing circulator based on the design of nano wire soft magnetic materials is all made of single layer of nanowires array structure, due to nanometer
The limitation of linear array itself and have biggish insertion loss.If M.Darques et al. design is based on single layer NiFe nano wire
The circulator insertion loss of array is being sacrificed close to -5dB, the circulator based on single layer of nanowires array of Zhong Zhiyong et al. design
In the case where bandwidth and isolation (bandwidth 0.4GHz or so, isolation minimum value are -20.4dB) its insertion loss also only -
2.3dB~-2.8dB.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of with low insertion loss and relatively large bandwidth based on more
The automatic biasing micro-strip circulator of layer Magnetic Nanowire Arrays (such as Fe, Co, Ni and its alloy).
The present invention solve the technical problem the technical solution adopted is that, the low insertion loss based on Magnetic Nanowire Arrays
Automatic biasing micro-strip circulator has the hexagonal prisms dielectric layer of cylindrical body through-hole, metallic bottom electrode including micro-strip Y knot matched line, center
With center knot, which is characterized in that the cylindrical center knot includes top insulating layer and bottom insulating layer and top layer
At least two layers of nano-wire array layer between insulating layer and bottom insulating layer is air layer between adjacent nano-array layer, empty
Have that volume is insignificant, only play a supportive role gasket in gas-bearing formation.
Further, the nano-wire array layer includes soft magnetism nano-wire array and porous alumina formwork, soft magnetism nanometer
Linear array is set in the nano aperture of porous alumina formwork；Porous alumina formwork is with a thickness of 50-200um, void ratio
50-80%, nano aperture diameter be 50-120nm, soft magnetism nanowire length used be 40-160um, material Fe, Co, Ni and
Its alloy.
Further, porous alumina formwork is with a thickness of 70um；Nano aperture diameter 80nm, void ratio 60%, institute
It is α-Fe, length 60um with nano-material.
The thickness 5um, outer arm lengths 2.8mm, outer arm width 0.65mm of the micro-strip Y knot matched line, interior arm lengths
2.8mm, inner arm width 1.9mm, inner circle radius 2mm, material is copper；
The thickness 250um of the dielectric layer, hexagonal prisms inscribed circle radius 7.6mm, inner cylinder through-hole radius 2mm, material
For polytetrafluoroethylene (PTFE), model Rogers RO3003；
The metallic bottom electrode is set to dielectric layer and centre junction bottom surface, and material is copper；
The centre junction includes 3 layers of nano-wire array layer, by top insulating layer, nano-wire array layer, air layer, nanometer linear array
Column layer, air layer, nano-wire array layer, bottom insulating layer sequence be arranged successively from top to bottom；Push up insulating layer and bottom insulating layer
Thickness is all 5um, and radius 2mm, insulating layer material is polytetrafluoroethylene (PTFE), air layer thickness 15um, air layer radius 2mm；?
The gasket of the sector structure of 30 ° of arcs, fan-shaped exradius 2mm, inner circle radius 1.9mm, spacer thickness are provided in air layer
15um, 3 every layer, arrangement in equilateral triangle, gasket material is polytetrafluoroethylene (PTFE)；Nano-wire array thickness degree 70um, radius
2mm。
The invention has the advantages that circulator centre junction of the present invention uses three layers of magnetic deposited with porous alumina formwork
Property nano-wire array layer, each interlayer separates with air layer, the purpose for reducing centre junction overall dielectric constant is realized, in microwave
Frequency range X-band has low insertion loss and high isolation.
Detailed description of the invention
Fig. 1 is the structure chart of the automatic biasing micro-strip circulator based on multilayer Fe nano-wire array, and a is stereoscopic schematic diagram, and b is
Longitudinal profile schematic diagram.Fig. 1 b is demonstrated by center and becomes multilayered structure, which advantageously reduces centre junction overall dielectric constant,
And then reduce insertion loss；
Fig. 2 is the magnetic conductivity high spectrum and dielectric constant high frequency for the aluminium oxide for being deposited with Fe nano-wire array that test obtains
Spectrum, the data source is in the test data of nano-wire array；Wherein a is magnetic conductivity high spectrum, and b is dielectric constant high spectrum；
Fig. 3 is the SEM test chart of porous alumina formwork；
Fig. 4 is the SEM test chart for being deposited with the alumina formwork longitudinal profile of Fe nano-wire array；
Fig. 5 is the simulation result curve of the return loss of the automatic biasing micro-strip circulator based on multilayer Fe nano-wire array
Figure, curve show that the circulator has preferable matching degree in 11.5GHz-12.5GHz；
Fig. 6 is the simulation result curve graph of the isolation of the automatic biasing micro-strip circulator based on multilayer Fe nano-wire array,
Curve shows isolation < -20dB relative bandwidth close to 9%；
Fig. 7 is the simulation result curve of the insertion loss of the automatic biasing micro-strip circulator based on multilayer Fe nano-wire array
Figure, curve show the circulator 11.5GHz-12.5GHz frequency range have lower insertion loss, value be -0.88dB~-
0.94dB。
The present invention is devised one kind and is received based on multilayer under the premise of measuring the intrinsic electromagnetic parameter of Magnetic Nanowire Arrays
The automatic biasing circulator of nanowire arrays structure overcomes the circulator based on Single Magnetic nano-wire array and damages with larger insertion
The shortcomings that consumption.
Embodiment:
The present embodiment includes that micro-strip Y ties matched line 1, there are the hexagonal prisms dielectric layer 2 of cylindrical body through-hole, metallic bottom electrode in center
3 and the most of composition of multilayer center knot 4 four.Multilayered structure is become at center, and upper and lower level is insulating layer, centre for three layers with
The array layer of the Fe nano wire of porous alumina formwork deposition, three layers of array interlayer are separated with two layers of air layer, are had in air layer
The insignificant gasket of volume is to support total.
Nano wire used in the present invention is by electrochemical deposition method with a thickness of 70um, and nano aperture diameter is about 80nm, hole
Gap is made than depositing Fe nano wire in the porous alumina formwork for 60%, and measuring nanowire length is about 60um, remanent magnetism
(4 π Mr) is 4200gauss, and magnetic conductivity high spectrum and dielectric constant high spectrum are as shown in Figure 2.
Each section parameter is as follows:
Micro-strip Y ties matched line: thickness 5um, outer arm lengths 2.8mm, outer arm width 0.65mm, interior arm lengths 2.8mm, inner arm
Width 1.9mm, inner circle radius 2mm, material are copper.
There are the hexagonal prisms dielectric layer of cylindrical body through-hole: thickness 250um, hexagonal prisms inscribed circle radius 7.6mm, interior cylinder in center
Body through-hole radius 2mm, material are polytetrafluoroethylene (PTFE) (model: Rogers RO3003).
Metallic bottom electrode: dielectric layer and centre junction bottom, hexagonal prisms structure (thin slice), hexagonal prisms inscribed circle radius are set to
7.6mm, material are copper.
Centre junction: by top insulating layer, nano-wire array layer, air layer, nano-wire array layer, air layer, nano-wire array
Layer, bottom insulating layer sequence be arranged successively from top to bottom, sequentially respectively correspond 41,42,43,44,45,46,47 in Fig. 1 b；Top is exhausted
The thickness of edge layer and bottom insulating layer is all 5 μm, radius 2mm, and insulating layer material is polytetrafluoroethylene (PTFE), and 15 μm of air layer thickness,
Air layer radius 2mm；The gasket for having volume minimum in air layer, gasket only play a supportive role, and material is polytetrafluoroethylene (PTFE), thick
Degree is 15um.
In conjunction with attached drawing 1, model can be constructed in HFSS by above-mentioned parameter, simulation result shows that the circulator exists
The insertion loss of 11.5GHz~12.5GHz is -0.88dB~-0.94dB, and isolation is -20.8dB~-56.4dB, echo damage
Consumption is -21.2dB~-41.6dB, and isolation < -20dB relative bandwidth is about 9%.Insertion loss and relative bandwidth are superior to existing
Technology.
Claims (2)
1. the low insertion loss automatic biasing micro-strip circulator based on Magnetic Nanowire Arrays, including micro-strip Y knot matched line, center have
Hexagonal prisms dielectric layer, metallic bottom electrode and the center knot of cylindrical body through-hole, which is characterized in that the center knot
Including at least two layers of nano-wire array between top insulating layer and bottom insulating layer and top insulating layer and bottom insulating layer
Layer, it is air layer between adjacent nano-wire array layer；
The nano-wire array layer includes soft magnetism nano-wire array and porous alumina formwork, and soft magnetism nano-wire array is set to more
In the nano aperture of porous aluminum oxide template；Porous alumina formwork is with a thickness of 50-200um, void ratio 50-80%, nano-pore
Hole dia is 50-120nm, and soft magnetism nanowire length used is 40-160um, material Fe, Co, Ni and its alloy；
Porous alumina formwork is with a thickness of 70um；Nano aperture diameter 80nm, void ratio 60%, nano-material used are α-
Fe, length 60um.
2. the low insertion loss automatic biasing micro-strip circulator based on Magnetic Nanowire Arrays as described in claim 1, feature
It is,
The thickness 5um of micro-strip Y knot matched line, outer arm lengths 2.8mm, outer arm width 0.65mm, interior arm lengths 2.8mm are interior
Arm width 1.9mm, inner circle radius 2mm, material is copper；
The thickness 250um of the dielectric layer, hexagonal prisms inscribed circle radius 7.6mm, inner cylinder through-hole radius 2mm, material is poly-
Tetrafluoroethene, model Rogers RO3003；
The metallic bottom electrode is set to dielectric layer and centre junction bottom surface, and material is copper；
The centre junction includes 3 layers of nano-wire array layer, by top insulating layer, nano-wire array layer, air layer, nano-wire array
Layer, air layer, nano-wire array layer, bottom insulating layer sequence be arranged successively from top to bottom；Top insulating layer and bottom insulation
The thickness of layer is all 5um, and radius 2mm, insulating layer material is polytetrafluoroethylene (PTFE), air layer thickness 15um, air layer radius
2mm。
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