Absorber-BandSorb®

Schlegel Electronic Materials (SEM) is pleased to introduce BandSorb® elastomer absorbers. Our new range of elastomer Cavity resonance (BandSorb® SC) Absorbers materials. The material consists of a thin, flexible, high-loss, magnetically loaded, electrically non-conductive silicone rubber. Schlegel can provide this material with different configurations for use in the frequency range of 1 GHz up to millimetre waves. With our own dedicated on site manufacturing and R & D team we are able to work closely with our customers to provide custom solutions where needed.

The BandSorb® absorbers are currently available as silicone rubber elastomer and a dielectric foam absorber.
The silicone rubber elastomer are available as:

SC: a flexible, high-loss, magnetically loaded, electrically non-conductive silicone rubber.
ST: a resonant absorbers which reflect -20 dB or less.
SH: a thermally conductive microwave absorber

Next to the silicone rubber material a lightweight high loss carbon impregnated dielectric foam absorber BandSorb® FB. BandSorb® FB provides a very low cost solution over the thinner rubber absorbers.
BandSorb® can be used for applications requiring absorption across a wide range of frequencies , such as antenna cross-talk and cavity resonance suppression.

BandSorb® SC Series

BandSorb® SC series is suitable for most commercial, telecommunication, military and medical applications. The high magnetic loss of the BandSorb® SC series is designed to exhibit high loss and are intended to be applied to metal surfaces. When placed on the inside of a microwave cavities BandSorb® SC series will reduce the Q of the cavity, eliminate surface currents and generally dampen reflections.

BandSorb® SC series materials can be supplied in sheets as well as custom die cut or kiss cut configurations. BandSorb® SC materials can be supplied with or without pressure sensitive adhesive (PSA). Myriad options give you the customer flexibility when choosing which BandSorb® SC product will work best in your design. BandSorb® SC materials are available in standard thicknesses however we can offer custom sizes and thicknesses to suit your specific requirements.

Applications

BandSorb® SC series provides a flexible solution that supports a wide range of EMI and RF suppression requirements.

Suppressing resonance and harmonics from circuitry, absorbing RF emissions from wiring, and reducing interference from internal peripheral devices are just a few examples of the use of BandSorb® SC inside electronics housings (computers, server racks, switches,….)

BandSorb® SC series can be used to reduce RF coupling between microwave components inside electronic housings. Typical applications include power amplifiers, oscillators and down/up converters.

When bonded to a metal surface the BandSorb® SC series will significantly reduce the reflectivity of metal objects or structures through the absorption of microwave currents.

In the telecommunication market the material can be applied to antenna elements, microwave dishes, the inner or outer surfaces of waveguides for isolation, attenuation or modification of radiating patterns. When applied to the side or even rear surfaces of certain objects this material will cause a significant reduction in “head on” reflectivity or backscattering.

BandSorb® SC series can also be used for circuit-to-circuit EMI interference and reduction of unwanted emissions from the imaging CCD’s and LCD displays.

In the automotive market the BandSorb® SC series can be used to suppresses interference from on-board electronics, such as telematics, on-board radar-based systems, GPS circuitry, and display systems.

CHARACTERISTICS	TEST	UNIT	SPECIFICATIONS
SEM Elastomers Absorber	-	-	SC-31	SC-52	SC-88
Typical Frequency Range	-	GHz	≥12	≥6
Typical Thicknesses	-	mm (inch)	0.25 (0.01), 0.50 (0.02), 1.0 (0.04) and 1.5 (0.06)	ditto	ditto
Typical Size	-	mm (inch)	300 x 300 (11.8 x 11.8)	ditto	ditto
Elastomer Binder	-	-	Silicone
Hardness	ASTM D 2240	Shore A	65	75	87
Elongation	ASTM D 412	%	40	37	12
Tensile Strength	ASTM D 412	MPa (psi)	3.3 (479)	4.5 (653)	4.1 (595)
Maximum service Temperature	-	°C (°F)	170 (338)	170 (338)	170 (338)
Flammability Rating	UL94*	-	V0	V0	V0
Colour	-	-	Grey	Grey	Grey
Volume Resistivity	ASTM D 991	<-cm	> 1010	> 1010	> 1010
		(<-in)	(>4 x 109)	(>4 x 109)	(>4 x 109)
Compliance	-	-	2015/863/EU (RoHS 2.0) Compliance, REACH SVHC Compliance, Halogen free	ditto	ditto

*Tested in accordance of UL94 specification

Product Number Example

SC –	88 -	05 -	A
Product Name	Attenuation@10GHz	Thickness (0.5mm)	With Pressure Sensitive Adhesive: A, blank: no tape

BandSorb® SN Series

BandSorb® SN series is an ultrathin near field noise suppression absorber used for EMI control in electronic devices. The absorber is designed for the frequency range from 10 MHz up to 6 GHz. It is used to mitigate EM energy; it interacts and suppresses the magnetic field at the noise source.

Availability:
BandSorb® SN series materials can be supplied in sheets as well as custom configurations, standard sheet size is 300 mm x 300 mm.
BandSorb® SN materials can be supplied with or without pressure sensitive adhesive (PSA).

Features and Benefits:
High magnetic permeability.
RoHs, Halogen Free, Reach compliant

Applications:
BandSorb® SN series absorber can be placed over CPUs, main chip sets and other memory and power IC devices to suppress radiated noise causing interference with RF functions, crosstalk or SAR emissions. It can be used to suppress noise currents from circuit trace lines and flat cables that act like radiating antennas causing EMI problems and crosstalk issues.

CHARACTERISTICS	TEST	UNIT	SPECIFICATIONS
SEM Elastomers absorber	-		SN-32	SN-120	SN-130
Typical Frequency Range	-	GHz	< 6	< 6	< 6
Typical Thicknesses	-	mm (inch)	0.50 (0.02)	0.1 (0.004), 0.5 (0.02)	0.05 (0.002), 0.1 (0.004),
Available Size		mm (inch)	300x20000/300x50000/200x300 (11.8x787.4/11.8x1968.5/7.87x11.8)	ditto	ditto
Hardness	ASTM D 2240	Shore A	90	-	-
Elongation	ASTM D 412	%	0.35
Tensile Strength	ASTM D 412	MPa (psi)	3.1 (450)	5.6 (812)	5.6 (812)
Service Temperature	-	°C (°F)	-40 to 85 (-40 to 185)	-40 to 120 (-40 to 248)	-40 to 120 (-40 to 248)
Flammability Rating	UL94*	-	V2	V2	V2
Colour	-	-	Silver	Silver	Silver
Surface Resistivity	ASTM D 991	Ω-cm (Ω-in)	> 10 12 (>10 12 )	> 10 6 (> 10 6 )	> 10 6 (> 10 6 )
Compliance			2011/65/EU(RoHS 2.0) Compliance, REACH SVHC Compliance, Halogen free	ditto	ditto

– the technical specification data is based on SEM tests and analysis that we believe to be reliable. However, in no event, shall SEM be liable for inaccuracies or omissions contained therein. In all cases, details and values should be verified by the customer
-UL is a registered trademark of Underwriters Laboratories, Inc.,
* tested according to.

Electromagnetic Properties

Product Number Example

SN –	32 -	50 -	A
Product Name	Mu@10MHz	Thickness (0.5mm)	PSA (blank: No PSA)

BandSorb® HP Series

BandSorb™ HP series is a thin high permeability ferrite sheet designed to have low losses at 13.56 MHz. The high permeability makes it ideal to use for NFC, RFID application & wireless charging application.

Availability:
BandSorb™ HP series materials can be supplied in sheets as well as custom configurations, standard sheet size is 125 mm x 125 mm.
The BandSorb™ HP consists out of ferrite covered with a protective film on one side and adhesive tape on the other side.

Features and Benefits:
High magnetic permeability, low loss
RoHs, Halogen Free

Applications:
BandSorb™ HP series can be used to improve the performance of:

NFC antenna for mobile phones and automotive.
NFC or RFID antenna for security & access control system.
Wireless charging for mobile phones and battery powered handheld electronic devices

Electromagnetic Properties

Structure

Product Number Example

BandSorb® FB Series

BandSorb® FB is a lightweight high loss carbon impregnated dielectric foam absorber.
BandSorb® FB provides a very low cost solution for many applications over the thinner more expensive rubber absorbers.
BandSorb® FB can be used for applications requiring absorption across a wide range of frequencies , such as antenna cross-talk, side lobe reduction and cavity resonance suppression.

Availability:
BandSorb® FB series materials can be supplied in sheets as well as custom configurations. The standard sheet size is 610 mm x 610 mm. The BandSorb® FB consists out of carbon loaded polyurethane foam. BandSorb® FB is electrically conductive due to the use of the carbon dispersion.

Features and Benefits:
Lightweight, flexible and easy to trim, High Loss, low density.
Available in different thicknesses to work in a wide range of broadband frequencies.

Applications:
BandSorb® FB series can be used to

lower cavity Q’s in RF amplifiers, oscillators, cabinets containing microwave devices, computer housings, LNB’s.
isolation of antennas by Insertion loss, shrouding antennas to improve the antenna patterns and undesired back lobes
reduce surface currents on radiating elements and outer ground-plane type surfaces.
Reflectivity of an object (metal or otherwise) can be reduced somewhat by applying one or more layers.

Physical Properties:

CHARACTERISTICS	TEST	UNIT	BandSorb® FB
Frequency Range	Insertion Loss	GHz	>1
Size	-	mm (inch)	610 x 610 (24x24)
Typical Thickness		mm (inch)	3.2 (1/8), 6.4 (1/4), 9.5 (3/8), 12.7 (1/2), 19.1 (3/4)
Maximum service Temperature	-	°C (°F)	100 (212)
Compliance			2011/65/EU(RoHS 2.0) Compliance, REACH SVHC Compliance, Halogen free

	Attenuation (dB/cm)		Relative Impedance (\|Z\|/Z0)
BandSorb®	3 GHz	10 GHz	3 GHz	10 GHz
FB-18	3.2	4.7	0.69	0.82
FB-20	4.2	7	0.61	0.78
FB-22	7.4	14.9	0.55	0.74
FB-24	11	24	0.25	0.44
FB-26	16	34	0.18	0.31
FB-28	20	40	0.16	0.27
FB-30	24	46	0.13	0.22

-the technical specification data is based on SEM tests and analysis that we believe to be reliable. However, in no event, shall SEM be liable for inaccuracies or omissions contained therein. In all cases, details and values should be verified by the customer

Instructions for use:
BandSorb® FB can be securely bonded to itself or to other materials such as metal, wood, and common plastic composites. To obtain a strong bond the surface should be thoroughly cleaned with a degreasing solvent. It can be readily cut with a band saw, scissors, or a sharp knife.
Product Number Example

FP –	30 -	3.2 -	A
Product Name	Type	Thickness	with Pressure Sensitive Adhesive: A, blank: no tape