CN203631710U - Two-stage microstrip isolator with magnetic shielding cover - Google Patents
Two-stage microstrip isolator with magnetic shielding cover Download PDFInfo
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- CN203631710U CN203631710U CN201320839433.7U CN201320839433U CN203631710U CN 203631710 U CN203631710 U CN 203631710U CN 201320839433 U CN201320839433 U CN 201320839433U CN 203631710 U CN203631710 U CN 203631710U
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Abstract
The utility model provides a two-stage microstrip isolator with a magnetic shielding cover, and belongs to the technical field of magnetic materials and devices. The two-stage microstrip isolator comprises a soft magnetic alloy base plate and a ferrite substrate arranged on the soft magnetic alloy base plate (the upper surface of the ferrite substrate is provided with a double-junction circular microstrip circuit, and the lower surface is provided with a grounding metal layer), permanent magnets are arranged above the geometric centers of the double-junction circular microstrip circuit, the magnetic shielding cover is arranged above the permanent magnets, the permanent magnets and the double-junction circular microstrip circuit are isolated by lower medium substrates, the permanent magnets and the magnetic shielding cover are isolated by upper medium substrates, the magnetic shielding cover is formed by the downward bending of edges of soft-magnetic plat plate alloy materials, the bottoms of the bending edges of the magnetic shielding cover are not contacted with the ferrite substrate, and the minimum in-cover horizontal dimension of the magnetic shielding cover is larger than the maximum distance between outer edges of the two permanent magnets and smaller than the side length of the ferrite substrate. The two-stage microstrip isolator with the magnetic shielding cover is advantaged by good magnetic shielding function, simple structure, and stable performance, the production and the debugging are facilitated, and the application requirement of increasing miniaturization and high integration can be satisfied.
Description
Technical field
The utility model belongs to magnetisable material and device technical field, relates to microstrip circulator and microstrip isolator, especially the twin-stage microstrip isolator with magnetic shielding cover.
Background technology
The assembly of microstrip circulator, microstrip isolator and formation thereof, as a kind of significant components that is widely used in Aero-Space electronics, communication system and scouts antagonism field, uses in a large number at present in radar, electronic warfare, navigation and guidance, communication base station.New design concept and advanced technology promote microwave system develop rapidly, and the integrated assembly integrated level that requires microstrip circulator to form of microwave system is higher, size is less, performance is more stable.Micro-carries product market demand constantly increases also to batch production speed and R&D cycle proposition requirements at the higher level simultaneously.
Twin-stage microstrip isolator refers to the microwave components being made up of two unijunction microstrip isolators, also can think by a bipolar micro-strip circulator and two microwave components that load forms.A kind of twin-stage microstrip isolator structural representation without magnetic screen function as depicted in figs. 1 and 2, go in ring each knot in microstrip circuit 5 of the binode that is made in ferrite substrate 1 surface goes in ring and between one of them port of microstrip circuit and earth terminal, is connected with a load resistance 6(load resistance 6 and can be arranged on ferrite substrate 1, also can be welded on magnetically soft alloy base plate 2).Whole microstrip isolator comprises magnetically soft alloy base plate 2, be positioned at the ferrite substrate 1 of magnetically soft alloy base plate 2 tops, ferrite substrate 1 lower surface has metal ground plane, upper surface has the binode microstrip circuit 5 that goes in ring, and provides two permanent magnets 31 and 32 of bias magnetic field to go in ring and between microstrip circuit 5, realize electricity respectively by a lower dielectric substrate 41 and 42 and isolate with binode.
It is to be generally exposed to ferrite substrate superjacent air space that two of twin-stage microstrip isolator without magnetic screen provide the permanent magnet 31 and 32 of bias magnetic field, as shown in Figure 3, the magnetically soft alloy base plate 2 of the magnetic line of force that two permanent magnets 31 and 32 produce under ferrite substrate 1 and the substrate of part and product forms closed loop, also have very most of magnetic line of force to disperse to surrounding, cause a large amount of magnetic field leakage-leakage fields, the impact causing like this mainly contains: the one, and leakage field causes magnetic field utilance low, the magnetic field being produced by permanent magnet only has part magnetic fields to the ferrite substrate of the belt microstrip circuit of knot, make ferrite substrate fail fully magnetization and have influence on the performance of product, the 2nd, the stray field of dispersing can produce and disturb the components and parts of surrounding magnetic field sensitivity, thereby has influence on microwave circuit performance, the 3rd, when product has ferromagnetic substance to exist around (as ferroalloy or microwave absorbing material), can have influence on direction and the size of the bias magnetic field of subassembly product, change original magnetized state, thereby affect the performance parameter of device, and then have influence on the performance of circuit.
In twin-stage microstrip isolator, provide the permanent magnet of bias magnetic field due to technical requirement difference, magnetic direction has two kinds of different states: two magnet magnetic line of force opposite directions (as shown in Figure 4) and two magnet magnetic line of force directions identical (as shown in Figure 5).Shown in Fig. 4, be two magnet magnetic line of force issue figure that magnetic direction is contrary, in figure, represent direction and the intensity of magnetic field transmission with the size of magnetic line of force arrow and line and closeness degree, two permanent magnets 31 and 32 are except forming closed loop with magnetically soft alloy base plate 2, between two permanent magnets, also have part to form loop, magnetic field is issued complicated, within the scope of about 5mm above two permanent magnets, there is in addition stronger stray field, within the scope of the about 3mm in the side of two permanent magnets, also have stronger leakage field.Emulation and test all show that by the magnetic field utilance of substrate be only 50% left and right, and leakage field accounts for approximately 50%, thereby the performance of product itself and peripheral circuit is had to larger impact.Shown in Fig. 5, be two magnet magnetic line of force issue figure that magnetic direction is identical, except forming closed loop with magnetically soft alloy base plate 2, above two permanent magnets, within the scope of about 5mm scope, the about 3mm in side, have outside stronger stray field, between two permanent magnets, mutually repel, Distribution of Magnetic Field is also more complicated.Above two kinds of different Distribution of Magnetic Field state magnetic field utilances are low, and the leakage field of generation has affected beyond Distribution of Magnetic Field around, because the phase mutual interference between two permanent magnets has influence on the belt magnetized state of knot, affected the performance of product.
Along with microwave system is to the development of miniaturization, multifunction, require the size of microwave components product less, also require the distance of two lift magnets less, magnet influences each other larger.In compact circuit, in order to prevent between microwave ferrite subassembly product and peripheral circuits and the external world magnetic disturbance each other, conventionally adopt magnetic shielding cover to shield the bias magnetic field of microwave components.
Existing a kind of twin-stage microstrip isolator with magnetic screen sheet, its structure chart as shown in Figure 6, comprises magnetically soft alloy base plate 2, is positioned at the ferrite substrate 1 and two permanent magnets 31 and 32 that bias magnetic field is provided of magnetically soft alloy base plate 2 tops; Ferrite substrate 1 upper surface has the belt microstrip circuit of binode, and lower surface has metal ground plane; Provide two permanent magnets 31 and 32 of bias magnetic field to lay respectively at two tops of tying the geometric center of the microstrip circuits that go in ring that binode goes in ring in microstrip circuit, permanent magnet 31 and 32 tops have the magnetic screen sheet 9 that adopts magnetically soft alloy flat panel production, two permanent magnets 31 and 32 and binode go in ring and realize electricity isolation by a lower dielectric substrate 41 and 42 respectively between microstrip circuit, between two permanent magnets 3 and magnetic screen sheet 9, realize electricity by a upper dielectric substrate 81 and 82 respectively and isolate.
Fig. 7 is the magnetic field simulation figure (two magnetic field of permanent magnet opposite directions) of the twin-stage microstrip isolator with magnetic screen sheet shown in Fig. 6, from figure, can obtain, the main loop of the magnetic line of force is: return the first magnet 31 along dielectric substrate on dielectric substrate 81 on the first permanent magnet 31, first, magnetic screen sheet 9, second 82, the second permanent magnet 32, second time dielectric substrate 42, ferrite substrate 1, magnetically soft alloy base plate 2, first time dielectric substrate 41; Also have the small part magnetic line of force along the outer of dielectric substrate 81, magnetic screen sheet 9 on the first magnet 31, first, air dielectric, ferrite substrate 1, magnetically soft alloy base plate 2, first time dielectric substrate 41 return the first magnet 31 formation loops, path; Equally, the small part magnetic line of force along the outer of dielectric substrate 82, magnetic screen sheet 9 on the second magnet 32, second, air dielectric, ferrite substrate 1, magnetically soft alloy base plate 2, second time dielectric substrate 42 return the second magnet 32 formation loops, path; All show by emulation and test, the twin-stage microstrip isolator magnetic line of force with magnetic screen sheet shown in Fig. 6 is very weak above radome, and has certain leakage field in the outer of magnetic screen sheet 9, and leakage field is about 10～15% left and right, and magnetic field utilance approaches 90%.
Fig. 8 is the magnetic field simulation figure (two permanent magnet magnetic field directions are identical) of the twin-stage microstrip isolator with magnetic screen sheet shown in Fig. 6, as can be seen from the figure, because magnetic direction is consistent, the magnetic screen sheet 9 that is placed in top is utmost points in magnetic field, changed the distribution in former magnetic field, as can be seen from the figure, above magnetic screen sheet 9, leakage field is less, but the surrounding stray field of twin-stage microstrip isolator becomes larger, this structure is not to playing the effect of magnetic screen in the identical situation of two magnetic directions.
The above-mentioned twin-stage microstrip isolator with magnetic screen sheet is simple in structure, is conducive to the Assembling Production of product, can play magnetic screening action to two contrary subassembly products of magnetic direction, but can not play magnetic screening action to product in the identical situation of two magnetic directions.
Existing another kind has the twin-stage microstrip isolator of all-magnetism shielding function, and its structure chart as shown in Figure 9, comprises magnetically soft alloy base plate 2 equally, is positioned at the ferrite substrate 1 and two permanent magnets 31 and 32 that bias magnetic field is provided of magnetically soft alloy base plate 2 tops; Ferrite substrate 1 upper surface has the belt microstrip circuit of binode, and lower surface has metal ground plane; Provide two permanent magnets 31 and 32 of bias magnetic field to lay respectively at two tops of tying the geometric center of the microstrip circuits that go in ring that binode goes in ring in microstrip circuit, permanent magnet top has the magnetic shielding cover 10 that adopts magnetically soft alloy material to make, two permanent magnets 31 and 32 and binode go in ring and realize electricity isolation by a lower dielectric substrate 41 and 42 respectively between microstrip circuit, two permanent magnets 31 and 32 with magnetic shielding cover 10 between realize electricity by a upper dielectric substrate 81 and 82 respectively and isolate.Its magnetic shielding cover 10 is hat-shaped structures, two permanent magnets 31 and 32 are covered on inside completely by this magnetic shielding cover 10, its edge contacts completely with magnetically soft alloy base plate 2, magnetic shielding cover 10 forms a totally enclosed magnetic shielding cover with magnetically soft alloy base plate 2, magnetically soft alloy base plate 2, two permanent magnets 31 and 32 and magnetic shielding cover 10 between form completely closed magnetic loop.
Figure 10 is the magnetic field simulation figure (two magnetic field of permanent magnet opposite directions) of the twin-stage microstrip isolator with all-magnetism shielding function shown in Fig. 9, as can be seen from the figure the magnetic line of force is controlled in the radome being formed by magnetic shielding cover 10 and magnetically soft alloy base plate 2, and flux loop has three: the first permanent magnet 31 is got back to along the first permanent magnet 31, magnetic shielding cover 10, ferrite substrate 1, magnetically soft alloy base plate 2 in the first loop; Second servo loop returns the first magnet 31 along the first magnet 31, magnetic shielding cover 10, the second permanent magnet 32, ferrite substrate 1, magnetically soft alloy base plate 2; Tertiary circuit is got back to the second permanent magnet 32 along the second permanent magnet 32, magnetic shielding cover 10, ferrite substrate 1, magnetically soft alloy base plate 2.Beyond being all presented at magnetic shielding cover 10 by emulation and test, there is no that leakage field leaks out, leakage field can be controlled at only to be had in 2%, magnetic field utilance approximately 98%.
Figure 11 is the magnetic field simulation figure (two permanent magnet magnetic field directions are identical) of the twin-stage microstrip isolator with all-magnetism shielding function shown in Fig. 9, as can be seen from the figure the magnetic line of force distributes also in the radome being formed by magnetic shielding cover 10 and magnetically soft alloy base plate 2, because magnetic direction is identical, two like magnetic poles repel each other, between two magnets, do not form the magnetic line of force, flux loop has two: the first permanent magnet 31 is got back to along the first permanent magnet 31, magnetic shielding cover 10, ferrite substrate 1, magnetically soft alloy base plate 2 in the first loop; Second servo loop is got back to the second permanent magnet 32 along the second permanent magnet 32, magnetic shielding cover 10, ferrite substrate 1, magnetically soft alloy base plate 2.Beyond being all presented at magnetic shielding cover 10 by emulation and test, there is no that leakage field leaks out, in leakage field approximately 5%, magnetic field utilance reaches approximately 95%.This all-magnetism shielding function is very good, has avoided the magnetic field phase mutual interference between subassembly product and the external world.
But this twin-stage microstrip isolator structure with all-magnetism shielding function is comparatively complicated, be unfavorable for the Assembling Production of product, also be unfavorable for further dwindling the volume of product, if adopt the structure of hat-shaped, in the time making, need reserved window so that introduce or draw the input/output port signal of the belt microstrip circuit of knot, the debugging that is not easy to tie belt microstrip circuit after magnetic shielding cover 10 encapsulation, magnetic shielding cover 10 adopts punch forming conventionally in addition, after encapsulation there is certain mechanical stress in inside, is easy to cause the fragmentation of ferrite substrate 1 when serious.
Summary of the invention
The utility model provides a kind of twin-stage microstrip isolator with magnetic shielding cover, this twin-stage microstrip isolator has good magnetic screen function, simultaneously simple in structure, stable performance, be convenient to produce and debugging, can meet microstrip ferrite device miniaturization and highly integrated application demand day by day, be applicable to the requirement that product is produced in enormous quantities.
The purpose of this utility model is achieved through the following technical solutions:
With a twin-stage microstrip isolator for magnetic shielding cover, its structure as shown in figure 12, comprises magnetically soft alloy base plate 2, is positioned at the ferrite substrate 1 and two permanent magnets 31 and 32 that bias magnetic field is provided of magnetically soft alloy base plate 2 tops; Ferrite substrate 1 lower surface has ground metal layer, upper surface has the belt microstrip circuit of binode, and (the belt microstrip circuit of binode is made up of the belt microstrip circuit of two unijunctions, the belt microstrip circuit of each two unijunctions respectively has three input/output end ports, one of them input/output end port docking, remain to have in two input/output end ports and between a port and earth terminal, be connected with a load resistance < load resistance 6 and can be arranged on ferrite substrate 1, also can be welded on > on magnetically soft alloy base plate 2); Two permanent magnets 31 and 32 lay respectively at the top of two belt microstrip circuit geometric centers of unijunction in the belt microstrip circuit of binode, two permanent magnet 31 and 32 tops have the magnetic shielding cover 10 that adopts soft magnetic material to realize, two permanent magnets 31 and 32 and binode go in ring and realize electricity isolation by a lower dielectric substrate 41 and 42 respectively between microstrip circuit, two permanent magnets 31 and 32 with magnetic shielding cover 10 between realize electricity by a upper dielectric substrate 81 and 82 respectively and isolate.With the twin-stage microstrip isolator difference with all-magnetism shielding cover shown in Fig. 9 be, the band magnetic shielding cover twin-stage microstrip isolator that the utility model provides, its magnetic shielding cover 10 is formed and the bending edge bottom of magnetic shielding cover 10 does not contact with ferrite substrate 1 but leaves gap by soft magnetism flat alloy edge of materials downward bending, and in the minimum cover of magnetic shielding cover 10, horizontal size is greater than the ultimate range between the outer of two permanent magnets 31 and 32 but is less than the length of side of ferrite substrate 1.
In technique scheme, between magnetically soft alloy base plate 2 and ferrite substrate 1, interfix, lower dielectric substrate 41 or 42 two sides are fixing with ferrite substrate 1 and permanent magnet 31 or 32 respectively, upper dielectric substrate 81 or 82 two sides respectively with permanent magnet 31 or 32 and magnetic shielding cover 10 fixing.
Figure 13 is the magnetic field simulation figure (magnetic direction of two permanent magnets is contrary) of the twin-stage microstrip isolator with magnetic shielding cover that provides of the utility model, the region of gap (clearance distance is 0.0mm～2.0mm) the about 1mm of scope forming between magnetic shielding cover 10 and ferrite substrate 1 has leakage field to produce, flux loop mainly: get back to the first permanent magnet 31 along the first permanent magnet 31, magnetic shielding cover 10, the second permanent magnet 32, ferrite substrate 1, magnetically soft alloy base plate 2; Only having small part is along the outer of magnetic shielding cover 10 and the formation loop, path of ferrite substrate 1, the magnetic line of force above radome and surrounding leakage field very weak.All show by emulation and test, leakage field is less than 5%, and magnetic field utilance is higher, is about 95%, and its shield effectiveness approaches the twin-stage microstrip isolator with all-magnetism shielding cover shown in Fig. 9 (magnetic direction of two permanent magnets is contrary).
Figure 14 is the magnetic field simulation figure (magnetic direction of two permanent magnets is identical) of the twin-stage microstrip isolator with magnetic shielding cover that provides of the utility model, the region of gap (clearance distance is 0.0mm～2.0mm) the about 1mm of scope forming between magnetic shielding cover 10 and ferrite substrate 1 has leakage field to produce, because the direction of two magnets 3 is identical, mutually repel, flux loop mainly: along first (or second) permanent magnet 31(or 32), magnetic shielding cover 10, ferrite substrate 1, air gap, magnetically soft alloy base plate 2 get back to first (or second) magnet 31(or 32); Also have the small part magnetic line of force to form loop by air dielectric.All show by emulation and test, the magnetic line of force above radome and surrounding leakage field very weak, leakage field accounts for 6%～8%, magnetic field utilance is higher, be about more than 92%, its shield effectiveness approaches the twin-stage microstrip isolator with all-magnetism shielding cover shown in Fig. 9 (magnetic direction of two permanent magnets is identical).
Figure 13 and Figure 14 analogous diagram show, effective magnetizing sphere of action mainly concentrates near permanent magnet, and therefore near permanent magnet, the zone of action is need to realize magnetic screen, prevent and the region of extraneous phase mutual interference.Therefore the twin-stage microstrip isolator with magnetic shielding cover that the utility model provides, in the minimum cover of its magnetic shielding cover 10, horizontal size is greater than the ultimate range between the outer of two permanent magnets 3 but is less than the length of side (when actual fabrication can much smaller than the length of side of ferrite substrate 1) of ferrite substrate 1, so both shielded permanent magnet central role region, be conducive to again reduce the occupied space of whole circulator, reach the effect that reduces volume simultaneously.
In addition, the twin-stage microstrip isolator with magnetic shielding cover that the utility model provides, its magnetic shielding cover forms a not exclusively magnet shielding structure for sealing by magnetically soft alloy base plate 2 and magnetic shielding cover 10.The edge bottom of magnetic shielding cover 10 does not contact with ferrite substrate 1 but leaves gap, can guarantee magnetic alloy supporting bracket 2, permanent magnet 31 or 32 and magnetic shielding cover 10 between form closed magnetic loop.Although the twin-stage microstrip isolator with magnetic shielding cover that shown in Figure 12, the utility model provides is not stopped leakage field phenomenon, but magnetic screen function of the present utility model has approached the effect with all-magnetism shielding cover in Fig. 9 very much, magnetic field utilance reaches more than 92%, can meet the requirement of most application scenarios.After using MAXWELL software to make a large amount of emulation and comparison, find, the utility model Shielding plan leakage field can be effectively controlled, the magnetic line of force transmits in the magnetic circuit of designing requirement, the leakage field of producing in the very little scope of 2%-8%, can not exert an influence to product itself and peripheral circuits.
Compared with the twin-stage microstrip isolator with magnetic screen sheet in Fig. 6, in the utility model, magnetic shielding cover 10 has the edge of bending, makes bias magnetic field to form loop from edge by ferrite substrate 1 and magnetically soft alloy base plate 2; In the contrary assembly of two magnetic directions, make leakage field drop to 5% from 12% left and right, magnetic field utilance brings up to 95% from 88%, and can be in the identical assembly of two magnetic directions, magnetic field utilance is also to more than 92% (and twin-stage microstrip isolator can not realize magnetic screening action in the situation that two magnetic directions are identical) with magnetic screen sheet.
With the twin-stage microstrip isolator ratio with all-magnetism shielding cover in Fig. 9, the utility model is placed in magnetic shielding cover 10 top of substrate, substrate is not wrapped up to radome inside, makes like this product size less, in the miniaturization of product, more has superiority.
The utility model is designed to the edge bottom of magnetic shielding cover 10 not contact with ferrite substrate 1 but leaves gap, maximum benefit is to be convenient to being connected of device and external circuitry, be convenient to debug tying the microstrip line circuit that goes in ring in assembling process simultaneously, after device package, there is not mechanical stress, avoided the technical problem of the ferrite substrate fragmentation that sealing brings completely mechanical stress causes yet.
In sum, the twin-stage microstrip isolator assembly with magnetic shielding cover that the utility model provides, there is good magnetic screen function, simultaneously simple in structure, stable performance, be convenient to produce and debugging, can meet micro-with device miniaturization and high integrated application demand day by day.
Accompanying drawing explanation
Fig. 1 is twin-stage microstrip isolator (built-in load) schematic diagram without magnetic shielding cover.
Fig. 2 is twin-stage microstrip isolator (external load) schematic diagram without magnetic shielding cover.
Fig. 3 is the twin-stage microstrip isolator cross-sectional view without magnetic shielding cover.
Fig. 4 is the contrary Distribution of Magnetic Field analogous diagram of twin-stage microstrip isolator magnetic direction without magnetic shielding cover.
Fig. 5 is the identical Distribution of Magnetic Field analogous diagram of twin-stage microstrip isolator magnetic direction without magnetic shielding cover.
Fig. 6 band magnetic screen sheet twin-stage microstrip isolator structural representation.
The contrary Distribution of Magnetic Field analogous diagram of Fig. 7 band magnetic screen sheet twin-stage microstrip isolator magnetic direction.
The identical Distribution of Magnetic Field analogous diagram of Fig. 8 band magnetic screen sheet twin-stage microstrip isolator magnetic direction.
Fig. 9 is band all-magnetism shielding twin-stage microstrip isolator structural representation.
Figure 10 is with the contrary Distribution of Magnetic Field analogous diagram of all-magnetism shielding twin-stage microstrip isolator magnetic direction.
Figure 11 is with the identical Distribution of Magnetic Field analogous diagram of all-magnetism shielding twin-stage microstrip isolator magnetic direction.
Figure 12 is the band magnetic shielding cover twin-stage microstrip isolator structural representation that the utility model provides.
Figure 13 be the utility model provide with the contrary Distribution of Magnetic Field analogous diagram of magnetic shielding cover twin-stage microstrip isolator magnetic direction.
Figure 14 be the utility model provide with the identical Distribution of Magnetic Field analogous diagram of magnetic shielding cover twin-stage microstrip isolator magnetic direction.
In above-mentioned each accompanying drawing, corresponding Reference numeral is:
The 1st, ferrite substrate, the 2nd, magnetically soft alloy base plate, 31 is first permanent magnets, 32 is second permanent magnets, 41 is first time dielectric substrate, 42 is second time dielectric substrate, the 5th, and the binode microstrip circuit that goes in ring, the 6th, load resistance, 81 is dielectric substrates on first, 82 is dielectric substrates on second, the 9th, and magnetic screen sheet, the 10th, magnetic shielding cover.
Embodiment
Below in conjunction with embodiment, the utility model is made to detailed description.
With a twin-stage microstrip isolator for magnetic shielding cover, its structure as shown in figure 12, comprises magnetically soft alloy base plate 2, is positioned at the ferrite substrate 1 and two permanent magnets 31 and 32 that bias magnetic field is provided of magnetically soft alloy base plate 2 tops; Ferrite substrate 1 lower surface has ground metal layer, upper surface has the belt microstrip circuit of binode, and (the belt microstrip circuit of binode is made up of the belt microstrip circuit of two unijunctions, the belt microstrip circuit of each two unijunctions respectively has three input/output end ports, one of them input/output end port docking, remain to have in two input/output end ports and between a port and earth terminal, be connected with a load resistance < load resistance 7 and can be arranged on ferrite substrate 1, also can be welded on > on magnetically soft alloy base plate 2); Two permanent magnets 31 and 32 lay respectively at the top of two belt microstrip circuit geometric centers of unijunction in the belt microstrip circuit of binode, two permanent magnet 31 and 32 tops have the magnetic shielding cover 10 that adopts soft magnetic material to realize, two permanent magnets 31 and 32 and binode go in ring and realize electricity isolation by a lower dielectric substrate 41 and 42 respectively between microstrip circuit, two permanent magnets 31 and 32 with magnetic shielding cover 10 between realize electricity by a upper dielectric substrate 81 and 82 respectively and isolate.
With the twin-stage microstrip isolator difference with all-magnetism shielding cover shown in Fig. 9 be, the band magnetic shielding cover twin-stage microstrip isolator that the utility model provides, its magnetic shielding cover 10 is formed and the bending edge bottom of magnetic shielding cover 10 does not contact with ferrite substrate 1 but leaves gap by soft magnetism flat alloy edge of materials downward bending, and in the minimum cover of magnetic shielding cover 10, horizontal size is greater than the ultimate range between the outer of two permanent magnets 31 and 32 but is less than the length of side of ferrite substrate 1.
In technique scheme, between magnetically soft alloy base plate 2 and ferrite substrate 1, adopt and be welded and fixed, lower dielectric substrate 41 or 42 two sides adopt adhesives to be adhesively fixed with ferrite substrate 1 and two permanent magnets 31 or 32 respectively, upper dielectric substrate 81 or 82 two sides adopt adhesives respectively with two permanent magnets 3 or 32 and magnetic shielding cover 10 be adhesively fixed.
The capable microstrip circuit of described binode dicyclo is made up of two round Y knots microstrip circuits, two triangular form Y knots microstrip circuits, two hexangle type Y knots microstrip circuits or two fishbone type Y knots microstrip circuits that go in ring that go in ring that go in ring that go in ring.
Upper and lower dielectric substrate can adopt the materials such as polysulfones, polytetrafluoroethylene, pottery or other medium to make.
Described magnetic shielding cover 10 can adopt Armco iron, iron-nickel alloy or other alloy material with soft magnet performance to make, and its upright projection shape can be rectangle, circle or oval.Be shaped as the magnetic shielding cover of rectangle for upright projection, can be formed by two of a rectangle magnetically soft alloy material opposite side or any three limits or four limit downward bendings, also can be directly stamped to form by rectangle magnetically soft alloy material; Be shaped as circular or oval-shaped magnetic shielding cover for upright projection, can adopt magnetically soft alloy disk to be directly stamped to form.
Claims (10)
1. the twin-stage microstrip isolator with magnetic shielding cover, its structure comprises magnetically soft alloy base plate (2), is positioned at the ferrite substrate (1) of magnetically soft alloy base plate (2) top and two permanent magnets (31 and 32) of bias magnetic field are provided; Ferrite substrate (1) lower surface has ground metal layer, upper surface has the belt microstrip circuit of binode, the belt microstrip circuit of described binode is made up of the belt microstrip circuit of two unijunctions, the belt microstrip circuit of each two unijunctions respectively has three input/output end ports, the docking of one of them input/output end port, remains to have in two input/output end ports and between a port and earth terminal, is connected with a load resistance; Two permanent magnets (31 and 32) lay respectively at the top of two belt microstrip circuit geometric centers of unijunction in the belt microstrip circuit of binode, two permanent magnets (31 and 32) top has the magnetic shielding cover (10) that adopts soft magnetic material to realize, two permanent magnets (31 and 32) and binode go in ring and realize electricity isolation by a lower dielectric substrate (41 and 42) respectively between microstrip circuit, between two permanent magnets (31 and 32) and magnetic shielding cover (10), realize electricity isolation respectively by a upper dielectric substrate (81 and 82);
It is characterized in that, described magnetic shielding cover (10) is formed by soft magnetism flat alloy edge of materials downward bending and the bending edge bottom of magnetic shielding cover (10) does not contact with ferrite substrate (1) but leave gap, and in the minimum cover of magnetic shielding cover (10), horizontal size is greater than the ultimate range between the outer of two permanent magnets (31 and 32) but is less than the length of side of ferrite substrate (1).
2. the twin-stage microstrip isolator with magnetic shielding cover as claimed in claim 1, is characterized in that, it is upper that load resistance (6) is arranged on ferrite substrate (1), or be welded on magnetically soft alloy base plate (2).
3. the twin-stage microstrip isolator with magnetic shielding cover as claimed in claim 1, is characterized in that, the gap between the edge bottom of magnetic shielding cover (10) and ferrite substrate (1) is 0.0mm～2.0mm.
4. the twin-stage microstrip isolator with magnetic shielding cover as described in claim 1,2 or 3, it is characterized in that, between described magnetically soft alloy base plate (2) and ferrite substrate (1), interfix, lower dielectric substrate (41 or 42) two sides is fixing with ferrite substrate (1) and permanent magnet (31 or 32) respectively, and upper dielectric substrate (81 or 82) two sides is fixing with permanent magnet (31 or 32) and magnetic shielding cover (10) respectively.
5. the twin-stage microstrip isolator with magnetic shielding cover as claimed in claim 4, is characterized in that, between described magnetically soft alloy base plate (2) and ferrite substrate (1), adopts welding manner to fix; Lower dielectric substrate (41 or 42) two sides adopts bonding mode fixing with ferrite substrate (1) and permanent magnet (31 or 32) respectively, and upper dielectric substrate (81 or 82) two sides adopts bonding mode fixing with permanent magnet (31 or 32) and magnetic shielding cover (10) respectively.
6. the twin-stage microstrip isolator with magnetic shielding cover as described in claim 1,2 or 3, it is characterized in that, described binode annular microstrip circuit is made up of two round Y knots microstrip circuits, two triangular form Y knots microstrip circuits, two hexangle type Y knots microstrip circuits or two fishbone type Y knots microstrip circuits that go in ring that go in ring that go in ring that go in ring.
7. the twin-stage microstrip isolator with magnetic shielding cover as described in claim 1,2 or 3, is characterized in that, upper and lower dielectric substrate adopts polysulfones, polytetrafluoroethylene, ceramic material.
8. the twin-stage microstrip isolator with magnetic shielding cover as described in claim 1,2 or 3, it is characterized in that, described magnetic shielding cover (10) adopts Armco iron, iron-nickel alloy or other magnetically soft alloy material to make, and its upright projection shape is rectangle, circle or oval.
9. the twin-stage microstrip isolator with magnetic shielding cover as claimed in claim 8, it is characterized in that, if the upright projection shape of described magnetic shielding cover (10) is rectangle, formed by two opposite side of rectangle soft magnetism plate material or any three limits or four limit downward bendings, or be directly stamped to form by rectangle magnetically soft alloy material.
10. the twin-stage microstrip isolator with magnetic shielding cover as claimed in claim 8, is characterized in that, if the upright projection shape of described magnetic shielding cover (10) is circular or oval, adopts magnetically soft alloy disk to be directly stamped to form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320839433.7U CN203631710U (en) | 2013-12-18 | 2013-12-18 | Two-stage microstrip isolator with magnetic shielding cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320839433.7U CN203631710U (en) | 2013-12-18 | 2013-12-18 | Two-stage microstrip isolator with magnetic shielding cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203631710U true CN203631710U (en) | 2014-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320839433.7U Expired - Fee Related CN203631710U (en) | 2013-12-18 | 2013-12-18 | Two-stage microstrip isolator with magnetic shielding cover |
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| Country | Link |
|---|---|
| CN (1) | CN203631710U (en) |
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2013
- 2013-12-18 CN CN201320839433.7U patent/CN203631710U/en not_active Expired - Fee Related
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Granted publication date: 20140604 Termination date: 20201218 |