ANECHOIC CHAMBER BY US AT SAC, ISRO
 

Space Application Centre (ISRO), Ahmedabad, India
   

Planar Near Field Chamber for Antenna Measurements
   

12.65m X 10m X 11.5m(L X W X H)
   

Quiet Zone Volume and Location: 9m X 6m X 3m (LXHXW) located in
the center both at length (12.65 m) and height (11.5m) wise and starts from
4.5m to 7.5m from wall behind the Scanner width (10m) wise.
Quiet Zone Performance: Better than –40 dB throughout the quiet zone.
Minimum Frequency of operation: 2.0 GHz.
   

Make: M/S Orbit /FR, Israel
Type: A-1-4953-1-9m-6m-V
Scan Area: 9m X 6m scan area

FU-SE absorber product line is a complete range of high performance pyramidal microwave absorbers.
Available in wide range of thickness and absorbencies.
Variety of thickness give the chamber designer the opportunity to choose grades appropriate for specific frequencies and incidence angles.
Constructed using low density, flexible foam, impregnated with a carbon black ferrite formulation to achieve the desired electrical performance.
The pyramidal structure gives it the geometrical matching and the carbon dispersed gives the attenuation required at near normal incidences
Provide engineers with the building blocks needed in the design and construction of RF absorbing surface used in anechoic chambers, antenna assemblies and microwave measuring facilities.

In Modular PAN Design mostly a 2mm thick GI sheet is turned into a PAN by 90 degree bending its all the four edges two times .The diagonal joint is welded by MIG/TIG welding to ensure radiographic quality of welding. The bends range from 25 to 60 mm, generally 40 mm. Oblong slots are made at the side bend for joining these PANS/Panels to the other ones

KV-RA are Thin, Flexible, Weatherproof, Resonating Rubber
based Microwave Absorbers.
Consists of Magnetically/Electrically loaded Neoprene (KVRA-
N) and Silicone (KV-RA-SI) rubbers.
Design frequency range is of 1 to 18 GHz.
Unlike typical iron-filled rubber absorbers, no oxidation is
possible due to the chemical nature of the filler component.
Highly reliable and stable as an outdoor radio wave absorber.
Suitable for Narrow Frequency Band Operations.
Can be readily cut with a sharp knife and template and
conforms to mild curvatures.
Highly flexible for easy processing and installation.
Available with a metal backing in 12"X12"size.

CONDUCTIVE GRAPHITE-FILLED SILICONE RUBBER SHEET  
 

KV-CR-G is conductive graphite filled sheet material
based on silicon rubber.
KV-CR-G Provides superior shielding and a reliable
environment seal.
Graphite allows KV-CR-G to maintain its physical and
electrical properties over a wide temperature range.
Extreme low temperature flexibility is excellent.

Low cost solution to anechoic chamber.
Reflection signal (reaching test zone) down by min -30dB with respect to direct signal.
Low RCS (Plastic pipe and holding devices) stand supplied to hold transmitting antenna (generally a high gain pyramidal horn.)
The antenna under test / Radar Cross Section measurement target stand provided on a manually/ electrically operated turntable with low RCS stand.
Five-side absorber covered plywood boxes.
Special corner block absorbers used.
Suitable type optimum performing absorbers at near normal/grazing incidences of extraneous signals used.
Two types of boxes are being made. Custom tailored solution, other size boxes, anechoic chambers can be provided.