CN105822124A - Microwave dark chamber used for third-order cross modulation and standing wave testing of antenna - Google Patents
Microwave dark chamber used for third-order cross modulation and standing wave testing of antenna Download PDFInfo
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- CN105822124A CN105822124A CN201610299435.XA CN201610299435A CN105822124A CN 105822124 A CN105822124 A CN 105822124A CN 201610299435 A CN201610299435 A CN 201610299435A CN 105822124 A CN105822124 A CN 105822124A
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- main body
- dark chamber
- ply board
- shielding
- microwave
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/16—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate against adverse conditions, e.g. extreme climate, pests
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B2001/925—Protection against harmful electro-magnetic or radio-active radiations, e.g. X-rays
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- Architecture (AREA)
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- Electromagnetism (AREA)
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- Pest Control & Pesticides (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Environmental & Geological Engineering (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Building Environments (AREA)
Abstract
The invention belongs to the field of microwave testing and relates to a microwave dark chamber used for third-order cross modulation and standing wave testing of an antenna. The microwave dark chamber is composed of a dark chamber main body and a wave absorption material arranged in the dark chamber main body, wherein the dark chamber main body is a sealed space which is composed of a main body framework and a shielding shell body fixed on the main body framework, and can allow a worker to walk in the space; a shielding layer is arranged on the surface of one side, facing the sealed space, of the shielding shell body; the wave absorption material is fixed on the shielding layer; the shielding shell body is made of a steel plate; the shielding layer is structurally a sandwiched three-ply board; inner and outer layers of the sandwiched three-ply board are wood-board three-ply boards; and a sandwiched layer is an aluminum foil. The microwave dark chamber provided by the invention is low in cost and simple and convenient to machine; the manufacturing of the dark chamber space is not limited and a large-size microwave testing dark chamber can be manufactured; the dark chamber has high shielding efficiency and can be used for shielding a magnetic field to form a magnetism-free environment; and the dark chamber does not have new mutual modulation influences and can meet the requirements of testing precision.
Description
Technical field
The invention belongs to microwave test field, be specifically related to a kind of microwave dark room tested for third order intermodulation and standing wave.
Background technology
The patent application " a kind of microwave dark room for intermodulation testing " of Publication No. CN102839844A discloses a kind of microwave dark room for antenna intermodulation testing, this microwave dark room is made up of darkroom main body and the absorbing material being arranged in the main body of darkroom, the closing space that the accommodated staff that described darkroom main body is made up of keel frame and the block wall being fixed on keel frame walks therein, described block wall is provided with screen layer to a side surface in described closing space, described absorbing material it is fixed with on described screen layer, the operating platform being available for staff's walking it is provided with in the inside of described darkroom main body；Shielding uses aluminum alloy plate materials, including Os Draconis and shielding aspect.The program makes the interference source of easily excitation intermodulation in shield structure obtain a certain degree of weak, but have the disadvantage that shielding uses aluminium alloy plate, cost is high, processing relative difficulty, shield effectiveness active interference low, extraneous are inevitable, due to aluminium alloy isolation unshielded to magnetic field, it is unfavorable for suppressing intermodulation to produce, test index is had an impact, because aluminium sheet intensity limits, cannot realize the construction in large-scale darkroom.
Summary of the invention
For the deficiency overcoming the microwave dark room being currently used for antenna intermodulation testing to exist, the present invention provides a kind of novel microwave darkroom, solves the problems referred to above by the redesign to shielding construction with without delayed sealing coat.
The technical solution adopted in the present invention is:
A kind of microwave dark room tested for antenna third order intermodulation and standing wave, it is made up of darkroom main body and the absorbing material being arranged in the main body of darkroom, the closing space that the accommodated staff that described darkroom main body is made up of main body frame and the shield shell being fixed on main body frame walks therein, described shield shell is provided with screen layer in the face of a side surface in described closing space, described absorbing material it is fixed with on described screen layer, the material of described shield shell is steel plate, described shielding layer structure is sandwich three-ply board, described sandwich three-ply board interior, outer layer is plank three-ply board, laminboard layer is aluminium foil.
Described plank three-ply board is 5mm plank three-ply board, and laminboard layer is the aluminium foil of 150g/.
Needing overlapped in described sandwich three-ply board at aluminium foil splicing seams, overlapping widths is a, need to meet a > 1/5 λ, and wherein λ is the wavelength corresponding to the minimum frequency of darkroom test job frequency.
Described shield shell can use the EMCP steel plate bolted housing produced according to European Technical, it is also possible to uses high-quality cold-rolled steel sheet, through shield gasket (CO2Protection weldering) form shielding wallboard shell structure form.Inside of shield casings top routine is perpendicular type, it is also possible to be barricaded as circular arc type.
The darkroom structure of the present invention have employed two-layer shielding, and the shield shell that steel plate is constituted is ground floor shielding, and sandwich three-ply board is second layer shielding.
In the present invention, steel construction low cost, processing simplicity, space, darkroom makes unrestricted, can manufacture large-scale microwave test darkroom, darkroom shield effectiveness is high, can be with armoured magnetic field, form non-magnetic environment, antenna measurement will not be produced new intermodulation effects, meet measuring accuracy requirement.Sandwich three-ply board, has anti-ant, fire prevention, moistureproof three anti-effects；In sandwich three-ply board, aluminium foil effect is to play good isolation between part to be measured and peripheral shield, avoid the generation of ground floor steel shielding residue PIM, shield as the second layer, further increase shield effectiveness (total isolation >=120dB), it is simultaneously achieved the good test environment (intermodulation residual value in darkroom is less than-130dBm) of low PIM, there is provided a high performance free space for antenna standing wave and intermodulation testing, thus reliable, the test data of specification can be obtained.
Accompanying drawing explanation
Fig. 1 is microwave dark room structural representation of the present invention.
Wherein: 1. steel construction main body frame；2. shield shell；3. outer layer plank three-ply board；4. aluminium foil；5. internal layer plank three-ply board；6. absorbing material；7. grid aisle.
Detailed description of the invention
The present invention is described in detail with embodiment below in conjunction with the accompanying drawings.
Embodiment 1:
Microwave dark room is mainly made up of main body frame, shield shell and absorbing material, the shielding auxiliary composition the most also matched.The aid systems such as auxiliary includes powering, ventilates, illuminates, communication.
The purpose of shielding has two: be 1. that the electromagnetic energy within restriction is gone out；2. it is to prevent external radiated wave from entering a certain region.The quality of shield effectiveness is not only relevant with the performance of shielding material, also relevant with various discontinuous shapes that may be present on housing and quantity with the distance of radiation source with radiation frequency, shield shell.Shielding design time, first it should be recognized that shielding area shielding before field intensity, and shielding after allow field intensity be how many, both differences are required shield effectiveness.The conceptual design meeting technical requirement is as follows:
The basic structure of shielded anechoic chamber is as shown in Figure 1.It is made up of darkroom main body and the absorbing material being arranged in the main body of darkroom, the closing space that the accommodated staff that described darkroom main body is made up of main body frame 1 and the shield shell 2 being fixed on main body frame walks therein, shield shell 2 is provided with screen layer 3 in the face of a side surface in described closing space, described absorbing material 4 it is fixed with on described screen layer 3, the material of described shield shell 2 is steel plate, described shielding layer structure is sandwich three-ply board, the inside and outside layer of described sandwich three-ply board is plank three-ply board 3,5, and laminboard layer is aluminium foil 4.
Main body frame: steel construction main body frame 1 is the carrying main body to all loads such as shielding and absorbing materials, this load-carrying construction is that principal post is bearing on bottom panel by the frame structure formed after board-like column and top girder bolt.Each side wall is formed side grid by short column weldering bolt between column and beam, top is welded by top board and rectangular steel pipe and is constituted top grid, bottom surface is constituted soffit grid skeleton by steel plate weldering bolt, end skeleton is connected to form one with ground by crab-bolt, and whole hexahedron is overall by the grid frame Special composition in above-mentioned six faces.
Shield shell: shield shell 2 uses the EMCP steel plate bolted housing produced according to European Technical.Shielding hexahedro disposably the mold pressing through 500T hydraulic press for 2mm high-quality cold-rolled steel sheet of main body makes unit module, overall zinc-plated, assembles formation shielding wallboard by M8 galvanized bolt, nut, pad and conductive gasket, and field bolted is on steel construction main body frame 1.
Inside of shield casings designs: for improving darkroom test performance, be barricaded as circular arc type with sandwich three-ply board along inside of shield casings top, a diameter of 3m of top arc.Inner shell dignity installs sandwich three-ply board, described sandwich three-ply board both sides are the internal layer plank three-ply boards 5 of the outer layer plank three-ply board 3 and 5mm of 5mm, laminboard layer is the aluminium foil 4 of 150g/, aluminium foil effect is to play good isolation between part to be measured and peripheral shield, it is achieved thereby that the test environment of low PIM, and facilitate the installation of absorbing material.Internal layer plank three-ply board 5, as the stickup basal plane of sponge absorbing material 6, is laid with grid aisle 7 in darkroom.
EMCP barricade feature:
Double-side hot galvanized steel plain sheet, 2mm thickness, zinc coat is not less than 20um (>=275g/m2)
Favorable compatibility, is i.e. suitable for individual small darkroom, it is possible to is supported in absolute construction and carries out large-scale anechoic chamber design
Under normal environmental, the performance of all-metal parts will not go down because of the time
Plate fast self-supporting maximum can be to 4 meters
Time of delivery is short
EMCP barricade is designed to the cavity construction that radiofrequency signal fully seals.Have employed securing member and packing ring between barricade, to realize conducting continuity, the highest shield effectiveness can be provided at dual-use aspect.
Shield shell construction features:
1) by quality steel plate through cutting out, unit module, convenient installation and bolt are formed.
2) being welded to form gantry frame by various shaped steel, abnormity Os Draconis, form the self supporting structure of truss-like, stiffness and strength is good, has shock resistance.
3) standard block plate body is directly laid on the mounting plane of gantry frame offer, two adjacent cells flat plate splicings bolts, it is ensured that the planarization of steel plain.
4) shield shell is located on the ground, it is ensured that the stability of structure and bearing.
5) screened room of splicing structure and the absorbing material of stickup, facilitate dismounting and the resettlement in darkroom.
All steel construction pieces do strict anti-corrosion and process, and brush two road antirust paints, one outward appearance paint, it is ensured that within 20 years, inner shield usefulness meets use requirement.
Screened room uses the galvanized steel plain sheet standard package of flanging to build.Use experience for many years has turned out this single-layer shield and is easily maintained, and has good durability.
The performance test of the present invention such as following table:
| Frequency | 0.7GHz | 1.7GHz | 3GHz |
| Shield effectiveness (conventional scheme) | 100dB | 100dB | 100dB |
| Darkroom remnants PIM (conventional scheme) | -110dBm | -110dBm | -110dBm |
| Shield effectiveness (present invention installs aluminium foil additional) | 120dB | 120dB | 120dB |
| Darkroom remnants PIM (present invention installs aluminium foil additional) | -130dBm | -130dBm | -130dBm |
Claims (4)
1. test microwave dark room for antenna third order intermodulation and standing wave for one kind, it is made up of darkroom main body and the absorbing material being arranged in the main body of darkroom, the closing space that the accommodated staff that described darkroom main body is made up of main body frame and the shield shell being fixed on main body frame walks therein, described shield shell is provided with screen layer in the face of a side surface in described closing space, described absorbing material it is fixed with on described screen layer, it is characterized in that, the material of described shield shell is steel plate, described shielding layer structure is sandwich three-ply board, described sandwich three-ply board interior, outer layer is plank three-ply board, laminboard layer is aluminium foil.
Microwave dark room the most according to claim 1, it is characterised in that described plank three-ply board is 5mm plank three-ply board, laminboard layer is the aluminium foil of 150g/.
Microwave dark room the most according to claim 1, it is characterised in that needing overlapped in described sandwich three-ply board at aluminium foil splicing seams, overlapping widths is a, need to meet a > 1/5 λ, and wherein λ is the wavelength corresponding to the minimum frequency of darkroom test job frequency.
Microwave dark room the most according to claim 1, it is characterised in that described shield shell uses EMCP steel plate bolted housing or high-quality cold-rolled steel sheet to seal welded case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610299435.XA CN105822124A (en) | 2016-05-06 | 2016-05-06 | Microwave dark chamber used for third-order cross modulation and standing wave testing of antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610299435.XA CN105822124A (en) | 2016-05-06 | 2016-05-06 | Microwave dark chamber used for third-order cross modulation and standing wave testing of antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105822124A true CN105822124A (en) | 2016-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610299435.XA Pending CN105822124A (en) | 2016-05-06 | 2016-05-06 | Microwave dark chamber used for third-order cross modulation and standing wave testing of antenna |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106448899A (en) * | 2016-08-27 | 2017-02-22 | 宁波博禄德电子有限公司 | Attachable cable |
| CN109208770A (en) * | 2017-06-30 | 2019-01-15 | 北新集团建材股份有限公司 | A kind of radiation protection sound absorbing plate |
| CN111601492A (en) * | 2020-05-09 | 2020-08-28 | 深圳市禹龙通电子有限公司 | Shielding device |
| CN113543614A (en) * | 2021-06-11 | 2021-10-22 | 西安空间无线电技术研究所 | Large passive intermodulation shielding darkroom |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09199885A (en) * | 1996-01-12 | 1997-07-31 | Tdk Corp | Microwave anechoic chamber |
| JP2000077884A (en) * | 1998-08-28 | 2000-03-14 | Ten Kk | Simple type radio dark room |
| CN201248226Y (en) * | 2008-08-12 | 2009-05-27 | 中国林业科学研究院木材工业研究所 | Glued board with build-in electromagnetic shielding lapping structure |
| CN102839844A (en) * | 2012-09-04 | 2012-12-26 | 大连东信微波吸收材料有限公司 | Microwave anechoic chamber for intermodulation test |
| CN202645099U (en) * | 2012-05-30 | 2013-01-02 | 深圳市栢富电子有限公司 | Microwave darkroom |
| CN203924390U (en) * | 2014-06-20 | 2014-11-05 | 金陵科技学院 | A kind of electromagnetic wave absorption board for building |
| CN104244687A (en) * | 2014-09-23 | 2014-12-24 | 中国科学院电子学研究所 | Electromagnetic shielding room |
| CN205604813U (en) * | 2016-05-06 | 2016-09-28 | 张宇桥 | Be used for antenna third -order on intermodulation and standing wave test microwave dark room |
-
2016
- 2016-05-06 CN CN201610299435.XA patent/CN105822124A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09199885A (en) * | 1996-01-12 | 1997-07-31 | Tdk Corp | Microwave anechoic chamber |
| JP2000077884A (en) * | 1998-08-28 | 2000-03-14 | Ten Kk | Simple type radio dark room |
| CN201248226Y (en) * | 2008-08-12 | 2009-05-27 | 中国林业科学研究院木材工业研究所 | Glued board with build-in electromagnetic shielding lapping structure |
| CN202645099U (en) * | 2012-05-30 | 2013-01-02 | 深圳市栢富电子有限公司 | Microwave darkroom |
| CN102839844A (en) * | 2012-09-04 | 2012-12-26 | 大连东信微波吸收材料有限公司 | Microwave anechoic chamber for intermodulation test |
| CN203924390U (en) * | 2014-06-20 | 2014-11-05 | 金陵科技学院 | A kind of electromagnetic wave absorption board for building |
| CN104244687A (en) * | 2014-09-23 | 2014-12-24 | 中国科学院电子学研究所 | Electromagnetic shielding room |
| CN205604813U (en) * | 2016-05-06 | 2016-09-28 | 张宇桥 | Be used for antenna third -order on intermodulation and standing wave test microwave dark room |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106448899A (en) * | 2016-08-27 | 2017-02-22 | 宁波博禄德电子有限公司 | Attachable cable |
| CN109208770A (en) * | 2017-06-30 | 2019-01-15 | 北新集团建材股份有限公司 | A kind of radiation protection sound absorbing plate |
| CN111601492A (en) * | 2020-05-09 | 2020-08-28 | 深圳市禹龙通电子有限公司 | Shielding device |
| CN113543614A (en) * | 2021-06-11 | 2021-10-22 | 西安空间无线电技术研究所 | Large passive intermodulation shielding darkroom |
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Application publication date: 20160803 |