CN1389951A

CN1389951A - Radiative water load

Info

Publication number: CN1389951A
Application number: CN 01108480
Authority: CN
Inventors: 王文祥; 孙嘉鸿; 张兆镗; 周鹏
Original assignee: University of Electronic Science and Technology of China
Current assignee: University of Electronic Science and Technology of China
Priority date: 2001-06-01
Filing date: 2001-06-01
Publication date: 2003-01-08

Abstract

The invention discloses the radiating type water load. Microwave transmitted on the wave-guide is radiated outward from the radiation mouth at the end of the wave-guide. Water in the water chamber at the radiation mouth is utilized to absorb the microwave. The water chamber is composed on the medium sheet plate covering the radiation mouth and the metal cavity. The sealed rubber band is used to seal the water. Thus, the water load possesses the characters of not damaged, no sticking, not leaking, large capacitance and power as well as the water load and can be miniaturized.

Description

A kind of radiative water load

The invention belongs to microwave technical field, particularly the water load in the microwave technology.

Water load is one of element the most frequently used in high-power (average power number pick up watt to several ten kilowatts) microwave system, its effect is that water absorbs microwave power and converts heat to and taken away by current, therefore it generally is connected the port that may have HIGH-POWERED MICROWAVES output as matched load in system, as the isolated port of circulator to absorb because the microwave high power that system terminal reflects when occurring not matching.When carrying out the power measurement of HIGH-POWERED MICROWAVES, the water load element that more is absolutely necessary by to the flow of the water of the water load of flowing through and the mensuration of the temperature rise after absorbing microwave, just can converse the size of microwave power.At present common water load all is to be absorbed by water gradually in the process transmitted in waveguide of microwave, and we are referred to as the conveying type water load.The hydroecium that holds water in this water load all is set directly at waveguide inside, it can be divided into independent hydroecium and two kinds of associating hydroeciums again, and the former is meant tubulose (as shown in Figure 1) or cone-shaped (as shown in Figure 2) hydroecium made from glass, quartz or other low microwave loss, easy shaping medium and is placed directly in the water load that constitutes in the waveguide; The latter then is bonded in the waveguide tiltedly to split shape with the dielectric-slab of low microwave loss often, forms hydroecium jointly with wave guide wall and the water load (as shown in Figure 3) that constitutes.Because hydroecium generally all is that friable material constitutes separately, easily broken, and the associating hydroecium often owing to adhesion strength inadequately, firm leaking not, cause the conveying type water load to have serious work hidden danger, cause current to enter whole microwave system in case leak, will cause serious consequence; On the other hand,, when needs improve the power capacity of water load, can only enlarge its volume by the length that increases hydroecium and realize, so just cause the volume of water load to increase with the method that increases the water yield because hydroecium is subjected to the restriction of waveguide dimensions; Moreover mode that hydroecium is placed in waveguide or the contour shape of itself will play the effect that the hydroecium coupling is absorbed, thereby further limit the design flexibility of hydroecium.

The present invention proposes a kind of radiative water load, and it is hydroecium to be placed on the waveguide antenna mouth absorb microwave outward, uses not breakable medium thin plate and metal cavitg to constitute hydroecium, have that size is little, power capacity greatly, can not fragmentation etc. advantage.

The object of the present invention is achieved like this: an inclined-plane radiation port is cut in waveguide 1, flange 9 of welding on this radiation port, cover radiation port with low microwave loss, not breakable medium thin plate 8 (as polytetrafluoroethylene etc.), make cavity 12 with metal then, metal cavitg 12 usefulness screws 13 are fastening with radiation port flange 9, by screw 13, utilize rubber sealing ring 10 that cavity 12 and dielectric-slab 8 sealings formation hydroecium 3 also are pressed on dielectric-slab 8 on the waveguide antenna mouth flange 9 (as shown in Figure 4) simultaneously.Like this, the microwave of being come by waveguide will enter hydroecium 3 to external radiation in radiation port, and be absorbed by water in hydroecium 3.

The waveguide antenna mouth generally should become certain angle of inclination with the waveguide axis, and the size of angle can be adjusted according to the coupling needs; Radiation port ring flange 9, medium thin plate 8, metal cavitg 12 and lute 10 can be circular, also can be rectangles, also can be other shapes; Waveguide 1 can be a circular waveguide, also can be rectangular waveguide, also can be the waveguide of other cross sectional shape; The shape of hydroecium 3 can be a cylinder, and cuboid also can be round platform, terrace with edge, also can be other solid figures; The cross section of lute 10 can be circular, also can be rectangle, also can be other shape.In addition, the sealing between medium thin plate 8 and the metal cavitg 12 can also adopt the mode of the edge of a knife 14 sealings to realize, as shown in Figure 5.

In case of necessity, the allotment element can be set in waveguide 1, wait the matching performance that improves water load as the small embossment of allocating screw, matching window, metal or medium.

Comparing the present invention with the conveying type water load has the following advantages:

(1) hydroecium needn't be placed on waveguide inside again and be in outside the waveguide in the present invention, and the matching performance of microwave absorbing only depends on the angle of inclination of radiation port, thereby the shape of hydroecium and the big or small restriction that required by waveguide dimensions or coupling, can very conveniently design flexibly;

(2) the present invention is not owing to need to use frangible media such as glass or quartz to make hydroecium separately, do not need in waveguide, to isolate hydroecium with dielectric-slab yet, thereby fundamentally eliminated because glass, quartz breaks or dielectric-slab and wave guide wall bond not firm leaking of causing with the method for bonding;

(3) the present invention absorbs conveying type and changes radiant type into and absorb, and hydroecium makes its volume can be sufficiently large outside waveguide, thereby improves the power capacity of water load; On the other hand, because hydroecium is to be made of metal cavitg and dielectric-slab, has enough intensity, water only can make dielectric-slab more closely be attached on the radiation port flange to the pressure of dielectric-slab in addition, thereby also can directly improve hydraulic pressure need not to improve by increase hydroecium volume water load with the flow that increases water power capacity.Like this, radiative water load has accomplished that volume is little, and power capacity is big;

(4) adopted the elastic tape sealing in the present invention, not only reliable, and flexible and convenient to use than original water load, can change elastic tape at any time in case of necessity.

(5) if come out with coupling loop a certain proportion of sub-fraction microwave power that is coupled with coupling probe or on narrow limit at the broadside of waveguide 1, water load then of the present invention just becomes a kind of small-sized high-power Microwave Sampling formula gage outfit and (sees that the patent No. is: the patent documentation of ZL 00 2 22182.9); Utilize wave detector or thermistor to detect this a part of microwave power that is coupled out through the calibration back, just can converse the microwave power that enters waveguide 1 in the coupling ratio, thereby realize that microwave high power measures, and can constitute miniature protable microwave high power meter thus and (see that application number is: the patent documentation of 00 1 12613.X).

Accompanying drawing and drawing explanation:

Fig. 1 is oblique cutting glass (quartz) pipe conveying type water load schematic diagram

Wherein, 1 is waveguide, and 2 is glass or quartz ampoule, and 3 is hydroecium;

Fig. 2 is cone-shaped glass (quartz) bubble conveying type water load schematic diagram

Wherein, 1 is waveguide, and 3 is hydroecium, and 4 is glass or quartzy bubble;

Fig. 3 is a bevel wedge shape bonding conveying type water load schematic diagram

Wherein, 1 is waveguide, and 3 is hydroecium, and 5 is dielectric-slab, and 6 is dielectric-slab and wave guide wall bonding part;

As can be seen, the hydroecium 3 of these several water loads is all in the inside of waveguide 1 from Fig. 1, Fig. 2, Fig. 3.

Fig. 4 is a radiative water load schematic diagram of the present invention

Wherein, 1 waveguide for the band radiation port, 3 is hydroecium, and 7 are the waveguide adpting flange, and 8 is the medium thin plate, and 9 is the radiation port flange, and 10 are the sealing elastic band, and 11 is water nozzle, and 12 for constituting the metal cavitg of hydroecium, and 13 is housing screw;

In Fig. 4,, utilize rubber sealing ring 10 that cavity 12 and dielectric-slab 8 sealings formation hydroecium 3 also are pressed on dielectric-slab 8 on the waveguide antenna mouth flange 9 by screw 13.

Fig. 5 is the schematic diagram of edge seal mode

Wherein, 8 is the medium thin plate, and 12 is metal cavitg, and 14 is the edge of a knife on the metal cavitg.

In Fig. 5, the sealing between dielectric-slab 8 and the metal cavitg 12 is pressed in the dielectric-slab 8 by the edge of a knife on the metal cavitg 14 and realizes.

Claims

1. radiative water load, it is characterized in that: it is by welding one flange 9 on the waveguide antenna mouth, cover radiation port with low microwave loss, not breakable medium thin plate 8, make cavity 12 with metal then, cavity 12 usefulness screws 13 are fastening with the radiation port flange, by screw 13, utilize rubber sealing ring 10 to make cavity 12 and 8 sealings of medium thin plate constitute hydroecium 3, and medium thin plate 8 is pressed on formation on the waveguide antenna mouth flange 9 simultaneously.

2. a kind of radiative water load according to claim 1 is characterized in that the sealing between described medium thin plate 8 and the metal cavitg 12 can realize by the edge of a knife on metal cavitg 12 14.