CN2126467U - High-power small volume matched-load structure - Google Patents

Abstract

The utility model provides a high-power small volume matched-load structure. A narrow side of a waveguide body is a gradual deformation cone; a solid medium absorber is respectively made into rectangle smooth and wedge-shaped smooth flat sheets according to wall width shape and the narrow side shape in the waveguide body; the flat sheets are placed on an inner wall of the waveguide body and closely contact with the inner wall; a longitudinal water-way slot is arranged on an outer wall of the waveguide body and is combined with water inlet and outlet nozzles in a sealing water-cooled sleeve to form a continuous single-cycle water-way. Loading length is reduced by 1 time to the existing homogeneous loading length. The utility model has well-matched performances in the states of kilowatt average power and megawatt pulse power, and can carry out long-term and stable operation.

Description

High-power small volume matched-load structure

The design belongs to High-Power Microwave transfer element field

In microwave power transmission and measuring equipment, employed various waveguide components, the element of the coupling that all need access terminal on one or more arms is called matched load, and it utilizes dump power in the medium absorption system, forms terminal areflexia state.The maximum power that desirable load should have good coupling on the whole wave guide bandwidth, shared space is little and energy consumption one is loose and obtained, existing high power waveguide load has different patterns and structure, what have uses water as absorbing medium, claim bulk absorption formula water load, but convenient not to the utmost when using.Commonly used have an air-cooled or water-cooled load of " doing " formula, employing solid dielectric absorbing material, and as carborundum and carbonyl iron etc., they are in use solid and reliable than the former.Development along with the HIGH-POWERED MICROWAVES element, the raising of power magnitude, the corresponding increasing of the volume of load, in the external product, find the load of having reported a S-band average power multikilowatt in Canadian GHZtechnology of the nineteen ninety company catalogue, its overall dimension reaches 32 inches unexpectedly, and big like this volume is very difficult in using.Existing at home average power multikilowatt (pulse power MW class) load, in S-band, its length is also about 0.5 meter, same use is very inconvenient, especially in medical treatment electronic equipment, for the microwave transmission system in the linear accelerator, because of equipment needs rotation therapy, usage space has been proposed the as far as possible little requirement of component size, thereby define the length that is allowed, domestic existing load can not meet the demands, and the import load not only costs an arm and a leg, especially component size does not meet the requirement of use, and can't adopt.

The design's purpose is exactly at the problems referred to above, requires to reduce the load volume under the high-power state bearing as far as possible, design a kind of small volume of water cold mould gradual change support structures, when satisfying whole requirement on electric performance, size can be dwindled at double, makes for use brings great side.

The design's concrete structure, can be in conjunction with the accompanying drawings:

Fig. 1 is the waveguide load longitudinal sectional drawing.

Fig. 2 is the waveguide load vertical view.

Fig. 3 is the horizontal sectional drawing of waveguide load.

Wherein: ［ 1 ］ waveguide mounting flange, ［ 2 ］ tapered waveguide body, ［ 3 ］ medium absorber, ［ 4 ］ sealing water collar, ［ 5 ］ back sealing flange, ［ 6 ］ back end cover, ［ 7 ］ housing screw, ［ 8 ］ indium silk, ［ 9 ］ sealing ring, ［ 10 ］ water inlet tap, ［ 11 ］ faucet, ［ 12 ］ are the water channel groove vertically.

In design, the size that ring flange and tapered waveguide body divide, all design according to known microwave component conventional design method, the narrow limit of tapered waveguide body height is in the scope internal linear gradual change that limits length, originate in the intrinsic height in the narrow limit of standard waveguide mouth (depend on and use wavelength), the narrow limit of necessary waveguide mouth height has been determined gradual gradient with this when ending at two broadside Absorption of Medium sheets and joining. Different from shape and the laying method of absorber in the existing load, this Absorption of Medium body ［ 3 ］ is pressed wide, the narrow limit of tapered waveguide body ［ 2 ］ inwall shape, do respectively orthogonal and smooth plain film wedge shape, by waveguide mouth place step, absorber and wave conductor ［ 2 ］ inwall is close to, keep good Mechanical Contact, the thickness of sheet is selected by bearing the watt level difference, range of choice is between (4-8) mm, know that through measurement this Absorption of Medium physical efficiency passes the heat more than 90% that absorbs rapidly. In Absorption of Medium body rearward end, two wide apertures that join and all be plugged with diameter for the indium silk of (2-3) mm with aperture that the waveguide mouth joins make it play filling effect through extruding during assembling, form good electrically contacting, and prevent from striking sparks under the high power. Sealing ring ［ 9 ］ is housed between rear sealing flange and the end cap, is for interface has good air-tightness, when using under loading on the high impulse power rating, will be filled with gas in the wave conductor, so need air-tightness good.

The water channel groove ［ 12 ］ in the designed tapered waveguide body wall outside, separated by the vertical parallel backbone that is distributed in projection on the wall, the backbone top is right after sealing water collar ［ 4 ］ inwall, they consist of the water-cooled path of sealing with the two ends ring flange, make cooling water form continuous single circulation waterway through nozzle and spout ［ 9 ］, ［ 10 ］, can be in service to waveguide at the recirculated water of 0.3 MPa pressure Cool off. Because current directly by the wave conductor outer wall, can conduct heat fully effectively. The used materials such as wave conductor, ring flange and sealed water jacket are basis brass, and seam crossing all connects with soldering.

The design's major advantage is: 1, the shape of medium absorber and be close to the displacement structure of making a gift of the waveguide inwall can absorb and be transmitted to the wave conductor surface fully effectively to dump power.2, the water channel groove of wave conductor outer surface can make recirculated water directly effectively load be cooled off, thereby can be expected to continue to improve the magnitude of bearing power under the situation of adjusting water velocity.3, this structure steady operation under the average power multikilowatt is than existing similar load length reduction more than one times.4, this structure can have good power match performance in frequency band, for example, in S-band, the standing-wave ratio of surveying all below 1.10.

Most preferred embodiment: the typical embodiment of this structure has made the matched load that is used for S-band average power multikilowatt, brass wave conductor wall thickness 4mm, the outside is the wide 12mm of tank vertically, and the backbone height is 6mm, wide 2mm, the medium absorbent material is selected the graphite ceramic material for use, the thickness of sheet is 6mm, and broadside 72mm is the rectangle on limit, long 230mm, narrow limit is to be the isosceles wedge shape at the end with 22mm, and this isoceles triangle form height is 230mm.During assembling, earlier wave conductor and front and back ring flange, water collar are all welded, from the rearward end medium absorber ［ 3 ］ of packing into, again it two wide slots that join and to fill in diameter with the aperture that the waveguide mouth joins be the thick indium silk of 2mm, with screw back end cover ［ 6 ］ is tightened with back sealing flange ［ 5 ］ at last.

This load total length 250mm, it can be worked under average power multikilowatt, pulse power MW class state sustainedly and stably.

Claims (5)

1, a kind of high power matched load, mainly by waveguide mounting flange tapered waveguide body, the medium absorber, back sealing flange, back end cover, order links to each other, it is characterized in that: be close to smooth sheet medium absorber [3] respectively in the wall inboard of tapered waveguide body [2], the absorber rear end is plugged with indium silk [8], and the wave conductor wall outside has vertical water channel groove [12], forms the water-cooled path with nozzle and spout [10], [11] in sealing water collar [4].

2, matched load according to claim 1, it is characterized in that, medium absorber ［ 3 ］ is by wide, the narrow limit of tapered waveguide body ［ 2 ］ inwall shape, make the smooth plain film of rectangle and wedge shape respectively, be adjacent to placement with wave conductor ［ 2 ］ inwall, the thickness of sheet carries out different choice by bearing the quantity of power level, and its scope is (4-8) mm.

3, matched load according to claim 1 is characterized in that, two wide slots that join in medium absorber ［ 3 ］ rear end and fill in diameter with the aperture that the waveguide mouth joins and be the indium silk ［ 8 ］ of (2-3) mm, and compress by back end cover ［ 6 ］.

4, matched load according to claim 1, it is characterized in that, tapered waveguide body wall outside water channel groove ［ 12 ］ is to be separated by the parallel longitudinal backbone that is distributed in projection on the wall, and the backbone top is right after sealing water collar ［ 4 ］ inwall, forms continuous single cycle water route.

5, matched load according to claim 1 is characterized in that, the medium absorbing material is a graphite ceramic, and water collar, wave conductor and ring flange material are basis brass.