Universal-Delta pyramid-shaped electromagnetic wave absorbers are used for lining anechoic chambers for testing radio wave emitting equipment and antennae of various use, as well as shielded rooms for radio compatibility testing. Additional uses include personnel protection against electromagnetic radiation.
Universal-Delta patented absorbers are pyramid-shaped flame-resistant polymer material containers filled with non-combustible electromagnetic absorbent mixes of two kinds: carbon fiber-based dry mix or foam glass granules with internal absorption, either of which ensures stable performance and operation.
Production of Universal-Delta absorbers has a three stage quality control: initial assessment of raw materials, continuous measurement of characteristics of absorbent mix, and final measurements of completed units under standard, to ensure high electromagnetic absorption performance.
Universal-Delta absorbers are classified as fire resistant (Certificate 9023736000) and environmentally safe absorbent materials (Certificate 55178729-12-1).
Product description
Universal-Delta RF absorbers are pyramid shaped containers filled with RF absorbing mix. At present, two standard size units are produced:
- 100 x 100 x 320 mm (Type A, AM, CF);
- 165 x 165 x 580 mm (Type B, BM).
To expand the product range, reduce weight and facilitate mounting, Universal-Delta RF absorber can be supplied as Type D block, consisting of nine 65x65x200 mm units, with overall dimensions of 200x200x200 mm.
The picture shows Universal-Delta RF absorbers of the following dimensions of 100х100х320 mm, 165х165х580 mm and 200х200х200 mm.
Each container is shaped as a square pyramid, with locking cover at its base. External edges are rounded, to reduce UHF wave reflection. Containers are made from strong radio transparent fire resistant polymer material of two types:
- Polystyrene (PS) V-0, UL94 (working temperature range -50ºC to +80ºC);
- Polyamide (PA) V-0, UL94 (working temperature range -50ºC to +250ºC).
The cover has mounting fixtures of one of following types:
- DIN rails;
- Knauf system PP 60, PS 100;
- universal mount (patented) – this can be used for combined RF absorber units with ferrite tiles.
Container covers have product ID markings.
Depending on required technical and operational specifications, containers can be filled with different absorbent mixes. Two types of RF absorbents are currently used:
- EVU – dry mix of highly stable compo-nents with optimal ratio of cellulose materials and carbon fibers (working temperature range -50ºC to +200ºC);
- PGV – foam glass granules with internal absorption (working temperature range -50ºC to +500ºC).
Foam glass granules (PGV) – due to their sealed cell structure – and dry mix (EVU) sustain extreme heating without deterioration in their RF absorbent qualities. PGV granules are a loose RF absorbent filler.
Principal characteristics
The table below shows the dimensions and operational characteristics of Universal-Delta RF absorbers of three main types:
| Universal-Delta Type | Dimensions, mm |
RF absorbent type | Weight, kg / sq.m |
Mounting type | Working temperature range |
|---|---|---|---|---|---|
| А, АМ | 100х100х320 | EVU | 21,0 | - DIN rail - Knauf system PP60 - universal mount |
-50 °С +80 °С |
| В, ВМ | 165х165x580 | EVU | 36,0 | - DIN rail - Knauf system PS100 |
-50 °С +80 °С |
| AF | 100х100x330 | EVU + ferrite tiles | 21,0 + 30,0 | - universal mount | -50 °С +80 °С |
| D (9 units block) | 200х200x200 | EVU/PGV | 10,0 / 27,0 | - DIN rail - Knauf system PS100 - universal mount |
-50 °С +80 °С |
| DF (9 units block) | 200х200x210 | EVU + ferrite tiles | 10,0 + 30,0 | - universal mount | -50 °С +80 °С |
| А1 | 100х100x320 | PGV | 39,0 | - DIN rail - Knauf system PP60 - universal mount |
-50 °С +280°С |
| D1 (9 units block) | 200х200x200 | PGV | 29,0 | - DIN rail - Knauf system PS100 - universal mount |
-50 °С +280 °С |
- Types AM, BM are filled with RF absorbent layers with varying carbon fiber content.
- Types CF, DF have 100x100x6 mm ferrite tiles, with attachment.
- Type A, AM, B, BM, D, DF, CF containers are made of polystyrene V-0, UL94 of light grey color.
- Type A1, D1 containers are made of polyamide V-0, UL94 of black color.
- Service life of all units is over 25 years.
Radio technical specifications
Tables 1, 2, 3 and 4 contain Universal-Delta's power reflectivity coefficients for normal incidence of radio waves, not exceeding -dB
| Types A, AM, A1 (size 100 x 100 x 320 mm) Table 1 | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frequency, GHz | 0,2 | 0,3 | 0,4 | 0,5 | 0,6 | 0,8 | 1,0 | 1,5 | 2,0 | 3,0 | 4,0 | 6,0 | 10 | 20 | 40 | 60 | 100 |
| Type A (EVU) | 10 | 15 | 22 | 27 | 30 | 34 | 37 | 40 | 42 | 43 | 45 | 45 | 45 | 45 | 45 | 50 | 50 |
| Type AM (EVU) | 14 | 20 | 25 | 30 | 33 | 35 | 38 | 40 | 42 | 43 | 45 | 45 | 45 | 45 | 45 | 50 | 50 |
| Type A1 (PGV) | 10 | 19 | 25 | 38 | 40 | 42 | 45 | 45 | 45 | ||||||||
| Type В, ВМ (size 165 х 165 х 580 mm) Table 2 | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frequency, GHz | 0,1 | 0,2 | 0,3 | 0,4 | 0,5 | 0,6 | 0,8 | 1,0 | 1,5 | 2,0 | 3,0 | 4,0 | 6,0 | 10 | 20 | 40 |
| Type В (EVU) | 10 | 15 | 20 | 25 | 30 | 33 | 37 | 40 | 42 | 45 | 45 | 45 | 45 | 45 | 45 | 45 |
| Type ВМ (EVU) | 14 | 25 | 30 | 34 | 37 | 40 | 42 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 |
| Type D, D1 (size 200 х 200 х 200 mm) Table 3 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frequency, GHz | 0,6 | 0,8 | 1,0 | 1,5 | 2,0 | 3,0 | 4,0 | 6,0 | 10 | 20 | 40 | 60 | 100 |
| Type D (EVU) | 20 | 28 | 30 | 35 | 38 | 40 | 45 | 45 | 45 | 45 | 45 | ||
| Type D1 (PGV) | 28 | 30 | 33 | 35 | 35 | 35 | |||||||
| Type АF (size 100 x 100 x 320 mm), Type DF (size 200 х 200 х 200 mm) Table 4 |
|||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frequency, GHz | 0,03 | 0,1 | 0,2 | 0,3 | 0,4 | 0,5 | 0,6 | 0,8 | 1,0 | 1,5 | 2,0 | 3,0 | 4,0 | 6,0 | 10 | 20 | 40 | 60 | 100 |
| Type АF (EVU) | 15 | 22 | 23 | 25 | 27 | 27 | 27 | 32 | 35 | 38 | 40 | 42 | 45 | 50 | 50 | 50 | 50 | 50 | 50 |
| Type DF (PGV) | 15 | 22 | 23 | 25 | 27 | 27 | 25 | 23 | 23 | 30 | 38 | 40 | 43 | 45 | 50 | 50 | 50 | 50 | 50 |
Notes: Type AF and DF with ferrite tiles size 100 х 100 х 6,0 мм.
Parameter control methods
Production of Universal-Delta absorbers has a three stage quality control, including:
- initial assessment of EM parameters of raw materials and components inside a full waveguide through measurement of dielectric losses;
- control of parameters of each absorbent mix batch by two horn antennas measuring end-to-end signal decay;
- sample measurement of reflectivity coefficient of each product batch against requirements of standard in the 0.4-15 GHz range.
This standard requires measurement of power reflectivity coefficient in free space by interference method, with normal incidence of EM wave. EM field reflected off the product sample forms a standing wave in the transmitting/receiving antenna. The wave's amplitude is measured by the sensor when the sample is moved against the antenna and the signal phase is changed.
It should be noted that the method demanded by this standard delivers high sensitivity and precision of measurement throughout the quoted frequency range – thus guaranteeing reliable accuracy of performance parameters of our units.
Universal - Delta Advantages
- Three stage quality control throughout production process, guaranteed high quality and uniformity of RF characteristics
- Wide range of radio frequency absorption, achieved by patented layered filling technology
- RF absorbent mix ensures stable absorption properties through the entire service life
- RF absorbent mix EVU retains its characteristics in wide working temperature range from -50ºC to +200ºC
- RF absorbent mix PGV retains its characteristics in wide working temperature range from -50ºC to +500ºC
- Three different patented mounting options, without the use of adhesive
- Reliable and stable mounting of containers is maintained through the service life of each unit
- Secure mounting prevents accidental detachment (20x reserve)
- Wide working temperature range and sealed design allows for outdoor use and wet cleaning
- Units can be easily removed, replaced and repaired
- Guaranteed service life for all units is 25 years
- EU compliant markings on all units
- Product documentation includes:
◦ passport for each production batch
◦ technical specification for RF absorbent mix (EVU, PVG)
◦ technical specification for Universal-Delta RF absorber
◦ results of sampling measurement of reflection coefficient for each batch
◦ EU certificate of fire safety DIN 4102-B2
◦ EU environmental certificate REACH