CN202068378U

CN202068378U - Ka-band mixer box

Info

Publication number: CN202068378U
Application number: CN2011201603436U
Authority: CN
Inventors: 王锦清; 苟伟; 仲伟业
Original assignee: Shanghai Astronomical Observatory of CAS
Current assignee: Shanghai Astronomical Observatory of CAS
Priority date: 2011-05-18
Filing date: 2011-05-18
Publication date: 2011-12-07
Anticipated expiration: 2021-05-18

Abstract

The utility model relates to a Ka-band mixer box, which comprises a rectangular box body, wherein, the box body comprises a base and a seal cover; a rectangular bottom groove is formed on the combined top surface of the base and the seal cover and used for accommodating a mixer circuit board; three grooves are formed on the top surface and respectively extend from three end surfaces of the bottom groove to three side surfaces of the corresponding base, wherein, a first groove and a second groove are formed at two opposite ends, and a third groove is formed at the other end; a slot is formed at one end of the bottom groove relative to the third groove, and an opening communicated with the slot is formed on the side of the base next to the slot; a fourth groove, a fifth groove and a sixth groove are formed on the combined bottom surface of the seal cover and the base and are respectively matched with the grooves on the base to form three through holes; and a first gutter channel and a second gutter channel are further formed on the bottom surface of the seal cover, the first gutter channel extends between the fourth groove and the fifth groove which are opposite, and the second gutter channel is perpendicular to the first gutter channel and extends form the sixth groove. The Ka-band mixer box has higher mixing efficiency, and outputs signals with less clutter.

Description

Ka wave band frequency mixer box

Technical field

The utility model relates to the frequency mixer box, relates more specifically to a kind of Ka wave band frequency mixer box.

Background technology

Frequency mixer is the device (generally all be to realize down-conversion, promptly high-frequency signal moved to low frequency) that is used for realizing frequency translation, and it has three ports usually, a rf inputs mouth RF, a medium frequency output end mouth IF and a local oscillator port LO.The frequency translation that frequency mixer is achieved as follows: IF=RF-LO or IF=LO-RF.Existing frequency mixer box generally all is simple hollow rectangle cavity, its capping is exactly an one flat plate, can't realize the single mode transport of signal, low reflection, and can not avoid resonance point effectively, therefore influenced by clutter, the mixing poor effect is especially for the Ka wave band (microwave signal of 26GHz～40GHz).

The utility model content

Technical problem to be solved in the utility model is to provide a kind of Ka wave band frequency mixer box, with single mode transport, the low reflection of the microwave signal that realizes the Ka wave band, and the microwave property of avoiding resonance point.

A kind of Ka wave band frequency mixer box of the present utility model, the box body that comprises a rectangle, described box body comprises base and capping, the end face that engages with described capping of described base is provided with a kerve that is used to hold the rectangle of mixer plate, described end face is provided with respectively three grooves that extend to three sides of the described base of correspondence from three end faces of described kerve, wherein first groove is positioned at relative two ends with second groove, the 3rd groove is positioned at the other end, end place at the described kerve relative with described the 3rd groove is provided with a fluting, is provided with the perforate that is communicated with described fluting on the side of the described fluting of vicinity of described base; The bottom surface with described base engages of described capping is provided with matches with the groove of described base respectively to form the 4th to the 6th groove of three through holes, also to be provided with on the bottom surface of described capping first raceway groove that extends and perpendicular to described first raceway groove and from second raceway groove of the 6th groove extension between the 4th groove that is oppositely arranged and the 5th groove.

This Ka wave band frequency mixer box also comprises the projection that is positioned at described first raceway groove and the described second raceway groove intersection.

Two through holes that are oppositely arranged in described three through holes are of a size of: hole depth 3.6mm, aperture 3.6mm.

The degree of depth of described through hole is 3.47mm.

The bottom surface of described kerve and described capping is provided with the connecting hole of mutual alignment.

Described base and capping are provided with mutual alignment and run through the location and installation hole of described base and capping respectively.

Respectively be provided with two screws on described three sides of described base.

It is higher to adopt Ka wave band frequency mixer box of the present utility model can make at the mixing efficiency of Ka wave band, and the clutter of output signal is less.

Described base and capping are made of the matrix of oxygenless copper material and gold-plated top layer.

Adopt the utility model can realize the single mode transport of the microwave signal of Ka wave band, low reflection, and the microwave property of avoiding resonance point.

Description of drawings

Fig. 1 shows the structural representation of the base of frequency mixer box of the present utility model;

Fig. 2 shows the structural representation of the capping of frequency mixer box of the present utility model;

The propagation condition of preceding 5 kinds of patterns of microstrip line when the port sizes that Fig. 3 shows this frequency mixer box is 3.6mmx3.6mm;

Fig. 4 a shows the transmission mode of microstrip line when having optimized port depth;

Fig. 4 b shows the S parameter when having optimized port depth;

Fig. 5 shows the transmission mode when adopting CPWG under the same size;

Fig. 6 shows the result who adopts preceding 20 resonance points that the utility model post-simulation obtains.

Embodiment

Below in conjunction with accompanying drawing the utility model is elaborated.

The frequency mixer that this paper discussed is in order to move the RF radiofrequency signal of Ka wave band (for example 32GHz) to about 1GHz IF intermediate-freuqncy signal and to design, and the box body that this frequency mixer is installed has been considered many-sided factor simultaneously and designed.

Ka wave band frequency mixer box of the present utility model is a rectangular box, and this box body divides two parts, comprises base 1 and capping 12, mixer plate holder between.For public property is stronger, base designs is fairly simple, and special needs have then been considered in capping, if different circuit requirements are arranged, as long as change capping again.

Fig. 1 shows the base 1 of this frequency mixer box.On base 1 and end face 11 that capping 12 engages, be provided with the kerve 2 of a rectangle, be used to hold the mixer plate.Have connecting hole 3 on this kerve 2, for example lay respectively on four angles of kerve 2.Also be provided with three

grooves

4,5 and 6 on this end face 11, it extends to three sides of the base 1 of correspondence from three end faces of kerve 2 respectively, wherein first groove 4 and second groove 5 are positioned at the opposite end of kerve 2, also respectively are being provided with two screws 10 (for example Fig. 1 only illustrates the screw 10 on the side wherein) on three sides of this base 1.Also be provided with a fluting 7 at the other end place of the kerve 2 relative, on the side of this fluting 7 of vicinity of base 1, be provided with and 7 perforates that are communicated with 8 of slotting with the 3rd groove 6.Perforate 8 and fluting 7 constitute the power input mouth of mixer plates, and power supply is successively by perforate 8 with slot and 7 link to each other with the power end of this mixer plate, 7 decoupling capacitors that also can be used for placing the power end that is connected this mixer plate of slotting.

Fig. 2 shows the capping 12 of this frequency mixer box.Be provided with three

grooves

14,15 and 16 that match with the

groove

4,5 and 6 of base 1 respectively on capping 12 and bottom surface 21 that base 1 engages, wherein the 4th groove 14 and the 5th groove 15 are oppositely arranged.When capping 12 engages with base 1, the

groove

4,5,6 of base 1 and the

groove

14,15,16 of capping 12 cooperate formation to be positioned at the through hole at place, three sides of box body respectively, wherein the through hole on two of box body relative sides is (promptly respectively by first groove 4 and the 4th groove 14, second groove 5 and the 5th groove 15 constitute) be respectively the input port and the output port of radiofrequency signal, the through hole on the another side (promptly being made of the 3rd groove 6 and the 6th groove 16) is the local oscillator input port.In order to guarantee single mode transport in the frequency range of needs, the input port and the output port of this radiofrequency signal are of a size of 3.6mmx3.6mm.By the emulation of 3 D electromagnetic farm software, microstrip line is a single mode transport under this port sizes, reflects less simultaneously.Also be provided with the connecting hole 13 that aligns with connecting hole 3 on the kerve 2 on the bottom surface 21 of capping 12, connecting

hole

3,13 is used for base 1 and capping 12 are fastened together, and can also be used to fixing whole box body simultaneously to refrigeration platform (15K temperature).Also be provided with between the 4th groove 14 and the 5th groove 15 first raceway groove 17 that extends on this bottom surface 21, and perpendicular to this first raceway groove 17 and second raceway groove 18 that extends from the 6th groove 16.First raceway groove 17 and second raceway groove 18 are of a size of the single mode transport that 3.6mmx3.6mm need satisfy microwave signal.Have a projection 22 at first raceway groove 17 and second raceway groove, 18 intersections, be used to suppress the coupling of input port, play buffer action preferably to output port.In base 1 and capping 12, also be provided with mutual alignment and run through base 1 respectively and the location and installation hole of capping 12 9,19, it plays the effect of location when assembling base 1 and capping 12, because the Ka wave band has been a millimere-wave band, the tolerance of assembling all can influence to some extent to electrical property.

Box body of the present utility model adopts and divides body structure, and is just very convenient when debugging at installation mixer plate with to this circuit board like this.Cell material adopts oxygen-free copper, and this is to have considered in the best down heat conduction of low temperature (15K).The gold-plated processing of box surface is the electric conductivity for the best.

We know that in nondissipative medium the complex propagation constant of ripple can be expressed as

Therefore, as long as survey the γ imaginary part of different mode ripple, just can learn whether this mode wave transmits.

The propagation condition of preceding 5 kinds of patterns of microstrip line when Fig. 3 represents that the input and output port of box body is of a size of 3.6mmx3.6mm, wherein P1:1 is the main pattern that needs on the microstrip line, all the other all are secondary higher modes, should avoid.Y1 represents the γ imaginary values among the figure, P1:1 refers to the accurate TE10 mould of the main mould that transmits on the microstrip line, can see that the transmission of microstrip line still is good in this rectangular waveguide, but on 38GHz, begin to have higher mode transmission (and we are concerned about be 26GHz～40GHz frequency band).

Box body of the present utility model has also been considered resonance problems, makes that the mould time influence of resonance is less on Ka (30GHz) wave band.By cavity (is denoted as 15 among Fig. 2,16,17,18,22 part) carries out the perturbation emulation in broadband, occur if there is resonance just to have crest, so long as cavity has resonance point certainly, what we will do is exactly to avoid main resonance point (resonant energy of 5 moulds in front is relatively large, and the higher mode resonant energy of back is much smaller).

Below by the degree of depth of optimizing port (be port extend to the side of base 1 from the end face of kerve 2 distance), the degree of depth of Que Dinging is 3.47mm at last.Fig. 4 a-b shows the transmission mode and the S parameter of the microstrip line under this port sizes respectively, and the S parameter is used to represent the transmission performance and the reflecting properties of microwave.

Can see that shown in Fig. 4 a except accurate TE10 mould (microstrip line transmits main mould) transmission, other patterns have all been fallen (imaginary part of propagation constant all is 0, so can't see on the figure) by good restraining in the full range band.Fig. 4 b is the S parameters simulation, can see that wave energy has obtained good transmission, and the energy loss that reflects back simultaneously is very little.

But, if adopt CPWG (co-planar waveguide) (rather than microstrip line), above the size constancy of port, that transmission mode can change again to some extent, as shown in Figure 5, as seen begins to have higher mode to begin to propagate on 38GHz.

Adopt preceding 20 resonance points that frequency mixer box post-simulation of the present utility model obtains as shown in Figure 6, wherein more down the mould of resonance is time high more, and energy is just more little.Fig. 6 English makes Chinese into---mould, energy.

The above is preferred embodiment of the present utility model only, is not in order to limiting scope of the present utility model, and the foregoing description of the present utility model can also be made various variations.Be that every simple, equivalence of doing according to the claims and the description of the utility model application changes and modification, all fall into the claim protection range of the utility model patent.

Claims

1. Ka wave band frequency mixer box, it is characterized in that, the box body that comprises a rectangle, described box body comprises base (1) and capping (2), the end face (11) that described base (1) engages with described capping (12) is provided with a kerve (2) that is used to hold the rectangle of mixer plate, described end face (11) is provided with respectively three grooves (4 that extend to three sides of the described base (1) of correspondence from three end faces of described kerve (2), 5,6), wherein first groove (4) is positioned at relative two ends with second groove (5), the 3rd groove (6) is positioned at the other end, be provided with a fluting (7) at an end place of the described kerve (2) relative, on the side of the described fluting of vicinity (7) of described base (1), be provided with the perforate (8) that is communicated with described fluting (7) with described the 3rd groove (6); The bottom surface (21) that described capping (12) and described base (1) engage is provided with respectively matches to form the 4th to the 6th groove (14,15,16) of three through holes with the groove (4,5,6) of described base (1), also is provided with first raceway groove (17) that extends on the bottom surface (21) of described capping (12) and perpendicular to described first raceway groove (17) and from second raceway groove (18) of the 6th groove (16) extension between the 4th groove (14) that is oppositely arranged and the 5th groove (15).

2. Ka wave band frequency mixer box as claimed in claim 1 is characterized in that, comprises that also being positioned at described first raceway groove (17) and described second raceway groove (18) intersects, and is provided with projection (22) in the intersection.

3. Ka wave band frequency mixer box as claimed in claim 2 is characterized in that two through holes that are oppositely arranged in described three through holes are of a size of: hole depth 3.6mm, bore dia 3.6mm.

4. Ka wave band frequency mixer box as claimed in claim 3 is characterized in that the degree of depth of described through hole is 3.47mm.

5. Ka wave band frequency mixer box as claimed in claim 1 is characterized in that, the bottom surface (21) of described kerve (2) and described capping (12) is provided with the connecting hole (3,13) of mutual alignment.

6. Ka wave band frequency mixer box as claimed in claim 1 is characterized in that, described base (1) and capping (12) are provided with mutual alignment and run through described base (1) respectively and the location and installation hole of capping (12) (9,19).

7. Ka wave band frequency mixer box as claimed in claim 1 is characterized in that, respectively is provided with two screws (10) on described three sides of described base (1).

8. Ka wave band frequency mixer box as claimed in claim 1 is characterized in that described base (1) and capping (12) are made of the matrix of oxygenless copper material and gold-plated top layer.