CN104577281B - Ferritic microwave isolator is loaded based on substrate integration wave-guide - Google Patents
Ferritic microwave isolator is loaded based on substrate integration wave-guide Download PDFInfo
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- CN104577281B CN104577281B CN201510031569.9A CN201510031569A CN104577281B CN 104577281 B CN104577281 B CN 104577281B CN 201510031569 A CN201510031569 A CN 201510031569A CN 104577281 B CN104577281 B CN 104577281B
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Abstract
Ferritic microwave isolator device is loaded based on substrate integration wave-guide the invention discloses one kind, including medium substrate, soft magnetic ferrite post and permanent-magnet ferrite, the upper and lower surface of the medium substrate is respectively equipped with conductive metal layer, medium substrate is provided with two row's conductive vias, the two rows conductive via constitutes substrate integration wave-guide with the conductive metal layer of upper and lower surface, row's non-conductive between two row's conductive vias and parallel with conductive via is additionally provided with medium substrate, the soft magnetic ferrite post is located in non-conductive, the permanent-magnet ferrite is located at soft magnetic ferrite post top.Microwave isolator utensil of the invention has small volume, lightweight, it is easy to the characteristic such as Planar integration, at the same also good heat dissipation, it is with low cost, the advantage such as be easily achieved.
Description
Technical field
The present invention relates to a kind of microwave isolator, specifically a kind of ferrite microwave isolator, more specifically one kind is based on
Substrate integration wave-guide loads ferritic microwave isolator.
Background technology
In high performance communication system, high isolation, the isolator of small size have highly important effect.In order to ensure letter
Number transmission when before reverse isolation to protect front stage circuits, particularly between two-stage high power device, high-performance isolator is must
One of indispensable device.In recent years, with the development of the technologies such as communication, radar, microwave technology is also widely applied, this
The mainstream technology in a little fields is planar microwave circuit, therefore performance, the volume particularly Planar integration ability to microwave isolator
Propose requirement higher.The ferrite isolator that the isolator of microwave section is loaded frequently with metal waveguide, although be resistant to
Microwave power higher, but this structure isolator often complex structure, involve great expense and be difficult it is integrated with planar circuit,
Requirement of the practical application to integrated high-performance isolator can not be met.
The content of the invention
Goal of the invention：For the problem and shortage that above-mentioned prior art is present, it is an object of the invention to provide a kind of structure
Simply, it is easy to the high performance microwave isolator integrated with planar circuit.
Technical scheme：For achieving the above object, the technical solution adopted by the present invention is：
One kind loads ferritic microwave isolator, including medium substrate, soft magnetic ferrite post based on substrate integration wave-guide
And permanent-magnet ferrite, the upper and lower surface of medium substrate is respectively equipped with conductive metal layer, and medium substrate is provided with two rows and leads
Electric via, two row's conductive vias constitute substrate integration wave-guide with the conductive metal layer of upper and lower surface, and position is additionally provided with medium substrate
Between two row's conductive vias and a row non-conductive parallel with conductive via, soft magnetic ferrite post is located at non-conductive
Interior, permanent-magnet ferrite is located at soft magnetic ferrite post top.
Further, the material of soft magnetic ferrite post is yttrium iron garnet ferrite, magnesium Mn ferrite or nickel-zinc ferrite.
Further, the material of permanent-magnet ferrite is strontium ferrite or barium ferrite.
Further, soft magnetic ferrite post is cylindrical shape.
Further, permanent-magnet ferrite is rectangular-shape.
Further, the material of medium substrate is microwave-medium sheet material of the dielectric constant between 2-4.
Further, the two ends of the upper surface of medium substrate are additionally provided with microstrip line, upper surface conductive metal layer and conductive mistake
Two vertical sides of hole are connected by impedance conversion with microstrip line respectively.
Further, above-mentioned impedance is transformed to trapezoidal shape sheet metal.
The position of the spacing and soft magnetic ferrite post that change both sides conductive via can be designed that and be operated in different frequency range
Microwave isolator device.
Operation principle：The basic structure of substrate integration wave-guide is that upper and lower surface is metal level, and centre is low loss dielectric base
Piece, then adds two row's metal throuth holes or metal column on medium, and traditional rectangular can be thus realized on dielectric substrate
The transmission characteristic of metal waveguide, its electromagnetic wave holotype is TE10Pattern.By introducing soft magnetic ferrite in substrate integration wave-guide
Post linear array, these soft magnetic ferrite posts provide bias magnetic field by the hard ferrite such as strontium ferrite block.In soft magnetic ferrite post
Near gyromagnetic resonance point, the electromagnetic wave of preceding backpropagation has different attenuation constants, therefore using this effect very thin
Isolator is built on medium substrate.
Beneficial effect：The present invention proposes a kind of microwave isolator of ferrite column linear array embedded in substrate integration wave-guide
（Referred to as " isolator "）.This isolator not only has the advantages that Insertion Loss is small, isolation is high, and also small volume, structure letter
List, handling ease, it is with low cost, be easily achieved the advantage such as integrated with planar microwave circuit.By changing both sides conductive via
The position of spacing and soft magnetic ferrite post linear array can be designed that the isolator of different frequency range.This planar structure is based on micro-
The practical application of isolator part provides extremely easily application conditions.
Brief description of the drawings
Fig. 1 is three-dimensional structure diagram of the invention.
Fig. 2 is structural parameters schematic diagram of the invention.
Fig. 3 is S parameter simulation result figure of the invention.
Fig. 4 is influence result figures of the both sides conductive via spacing Wh to isolator performance.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate
The present invention rather than limitation the scope of the present invention, after the present invention has been read, those skilled in the art are to of the invention each
The modification for planting the equivalent form of value falls within the application appended claims limited range.
Fig. 1 shows the 3-D solid structure of microwave isolator of the present invention.One kind that the present embodiment is provided is based on
Substrate integration wave-guide loads ferritic microwave isolator, and Rectangular Enclosure with Participating Media substrate 1 can be micro- between 2-4 using dielectric constant
Ripple medium sheet material, its upper and lower surface is respectively equipped with conductive metal layer, generally copper clad layers.Medium substrate 1 is provided with two
The parallel conductive via 2 of row, the copper clad layers with upper and lower surface constitute rectangle substrate integrated waveguide, and position is additionally provided with medium substrate 1
Between two row's conductive vias 2 and a row non-conductive 3 parallel with conductive via 2, each built-in soft magnet of conductive through hole 3
Oxysome post, soft magnetic ferrite post can be cylindric, and its material can use yttrium iron garnet ferrite, magnesium Mn ferrite or nickel zinc iron
Oxysome etc..Soft magnetic ferrite post top is provided with the permanent-magnet ferrite 4 for providing bias magnetic field, and permanent-magnet ferrite 4 can be rectangular-shape,
Its material is using strontium ferrite or barium ferrite etc..
The two ends of the upper surface of medium substrate 1 are additionally provided with microstrip line 5, and rectangular metal layer and the conductive via 2 of upper surface hang down
Two straight sides convert 6 and are connected with microstrip line 5 by impedance respectively.Microstrip line 5 is strip sheet metal, and impedance conversion 6 is trapezoidal
Shape sheet metal, the metal level covering monoblock substrate 1 of the lower surface of substrate 1.
Fig. 2 shows the structural parameters schematic diagram of the microwave isolator of the embodiment of emulation testing of the present invention.This implementation
In example, medium substrate dielectric constant 2.6, thickness H=1mm, width W=36mm.Conductive via and yttrium iron garnet ferrite cylinder
Diameter of phi=0.4mm, interval S 1=1.4mm, both sides conductive via spacing Wh=26mm, ferrite cylinder linear array is away from homonymy conduction mistake
Hole S2 is S2=2.6mm, input and output microstrip line according to the value that approximate formula S2=0.1*Wh can be met optimal isolation degree
Wo=2.2mm wide, changeover portion Microstrip Length Lm=15mm.The dielectric constant of strontium-permanent-magnet ferrite material is 21.5, width Wp=
2mm, height Hp=5mm, length is L=24mm.Yttrium iron garnet ferrite saturation magnetization 4πms=1800Gauss, dielectric is normal
Number ε=15.
The S parameter simulation result of microwave isolator when Fig. 3 shows both sides conductive via spacing Wh=26mm.Simulation result
Show, isolator centre frequency 11.06GHz, being calculated according to preceding reverse transfer difference -20dB has the bandwidth of nearly 200MHz, insertion
Loss is less than 2dB, and this isolator has good fl transmission and reverse isolation characteristic.Meanwhile, port reflectance factor s11 and
S22 is less than -15dB in the frequency range, with good port match performance.
Fig. 4 influences feelings when showing that both sides conductive via spacing Wh is changed into 30mm from 22mm on the S parameter of microwave isolator
The simulation result of condition.Both sides conductive via spacing Wh from 22mm be changed into 30mm when, the centre frequency of isolator is become by 11.12GHz
Be 11GHz, at centre frequency before 0.3dB is changed into from 3dB to Insertion Loss, isolation is changed into 15dB from 30dB.Reduce spacing Wh, isolation
The centre frequency of device device will increase, and isolation can also increase simultaneously.Therefore, it can neatly both sides conductive via spacing Wh,
To meet the design requirement of the isolator of different frequency.
Isolation when can obtain substrate integration wave-guide length for L by the difference of S21 and S12 in Fig. 3 and Fig. 4, is setting
When meter loads ferrite isolator based on substrate integration wave-guide, demand that can be first according to isolator frequency range determines both sides conduction mistake
The size of pitch of holes Wh, isolation when obtaining substrate integration wave-guide length for L obtains the isolation of unit length through conversion
（Isolation during length L can obtain the isolation of unit length divided by L）, then further according to the requirement of isolator isolation,
Substrate integration wave-guide length is determined for L, so as to just can be designed that the isolator of required frequency range.
Claims (8)
1. it is a kind of that ferritic microwave isolator is loaded based on substrate integration wave-guide, it is characterised in that including medium substrate, soft magnetism
Ferrite column and permanent-magnet ferrite, the upper and lower surface of the medium substrate are respectively equipped with conductive metal layer, medium substrate
Two row's conductive vias are provided with, the two rows conductive via constitutes substrate integration wave-guide, is situated between with the conductive metal layer of upper and lower surface
Row's non-conductive between two row's conductive vias and parallel with conductive via, the soft magnet are additionally provided with matter substrate
Oxysome post is located in non-conductive, and the permanent-magnet ferrite is located at soft magnetic ferrite post top.
2. microwave isolator according to claim 1, it is characterised in that the material of the soft magnetic ferrite post is yttrium iron stone
Garnet ferrite, magnesium Mn ferrite or nickel-zinc ferrite.
3. microwave isolator according to claim 1, it is characterised in that the material of the permanent-magnet ferrite is strontium ferrite
Or barium ferrite.
4. microwave isolator according to claim 1, it is characterised in that the soft magnetic ferrite post is cylindrical shape.
5. microwave isolator according to claim 1, it is characterised in that the permanent-magnet ferrite is rectangular-shape.
6. microwave isolator according to claim 1, it is characterised in that the material of the medium substrate is that dielectric constant is situated between
Microwave-medium sheet material between 2-4.
7. microwave isolator according to claim 1, it is characterised in that the two ends of the upper surface of the medium substrate also set
There is microstrip line, conductive metal layer two sides vertical with conductive via in upper surface are connected by impedance conversion with microstrip line respectively.
8. microwave isolator according to claim 7, it is characterised in that the impedance is transformed to trapezoidal shape sheet metal.
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| CN105914439B (en) * | 2016-05-23 | 2019-03-15 | 电子科技大学 | The face the substrate integration wave-guide H automatic biasing isolator of soft magnetism nano-wire array |
| CN106129563B (en) * | 2016-07-08 | 2019-11-19 | 中国人民解放军空军工程大学 | One kind being based on the ferritic adjustable microwave isolator of WAVEGUIDE LOADED |
| TWI623144B (en) * | 2016-10-03 | 2018-05-01 | 國立高雄科技大學 | Integrated microstrip line structure applying to coplanar waveguide of wideband |
| CN107240747A (en) * | 2017-05-18 | 2017-10-10 | 电子科技大学 | A kind of SIW transmission lines |
| CN108400413A (en) * | 2017-11-12 | 2018-08-14 | 宁波工程学院 | One kind being based on ferritic adjustable microwave isolator |
| CN111816965A (en) * | 2020-03-09 | 2020-10-23 | 宁波工程学院 | Waveguide isolator and control method thereof |
| CN113540731B (en) * | 2021-09-15 | 2021-11-23 | 成都威频科技有限公司 | YIG loading substrate integrated waveguide structure |
| CN114566777B (en) * | 2022-01-13 | 2024-02-23 | 东南大学 | Artificial SPP electromagnetic device for nonreciprocal signal routing |
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