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.
Specifications
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) | 300×20000/ | 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 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
– 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
Structure
Product Number Example
| HP – | 150 – | 10 – | 4040 |
| Product Name | Permeability @ 13.56MHz | Thickness Ferrite (0.1mm) | Part Size code (40×40 mm) |
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 (24×24) |
| 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 |
Thin, Flexible, Resonant Magnetically-Loaded Microwave Absorber
Product Description
BandSorb® ST is a series of resonant absorbers which reflect -20 dB or less of normally incident microwave energy at the design frequency in the range of 1.5 to 26 GHz. Designers can use it for applications requiring absorption at a specific frequency or in a narrow frequency band.
Availability
SEM supplies BandSorb® ST series materials in sheets and custom configurations. The standard sheet size is 300 mm x 300 mm. BandSorb® ST has a varying thickness according to the desired resonant frequency. Grades are designated by a suffix corresponding to the resonant frequency.
Features and Benefits:
BandSorb® ST consists of a thin, flexible, high-loss, magnetically loaded, electrically non-conductive silicone rubber. Silicone absorbers have high service temperature capability (170°C continuous) and allow short exposure to higher temperatures.
Applications:
BandSorb® ST series can be used to absorb at a specific frequency or in a narrow frequency band, including:
- Attaching to masts of ships, walls, etc. to reduce reflections and echoes from nearby antennas
- Attaching to vehicles to reduce radar signature.
- Lining magnetron housings to prevent detuning.
- Fabricating into tapered shapes for impedance matching in waveguide or microstrip applications.
- Suppressing reflections, surface currents, and cavity resonances inside microwave modules.
- Lining of cavity-backed and shrouded telecommunication antennas where narrowband performance is required, e.g., waveguide feeds.
For module interference, cavity resonance and surface current problems where no specular reflectivity performance is required, BandSorb® ST, is recommended due to its high magnetic loss properties.
| CHARACTERISTICS | TEST | UNIT | SPECIFICATIONS | ||
|---|---|---|---|---|---|
| Design Frequency Range | – | GHz | 1.5 to 18 | ||
| Thicknesses | – | mm (inch) | 1.2 – 4.5 (0.047 – 0.177) | ||
| Typical Size | – | mm (inch) | 300 x 300 (11.8 x 11.8) | ||
| Elastomer Binder | – | – | Silicone | ||
| Hardness | ASTM D 2240 | Shore A | 50-95 | ||
| Elongation | ASTM D 412 | % | 10-180 | ||
| Tensile Strength | ASTM D 412 | MPa (psi) | 2-6 (479) | ||
| Maximum service Temperature | – | °C (°F) | 170 (338) | ||
| Flammability Rating | UL94* | – | V0 | ||
| Colour | – | – | Grey | ||
| Volume Resistivity | ASTM D 991 | Ω-cm (Ω-in) | >10(10) (>4 x 10)(9) | ||
| Compliance | – | – | 2015/863/EU (RoHS 2.0) Compliance, REACH SVHC Compliance, Halogen free | ||
*Tested in accordance of UL94 specification
*The technical specification data is based on SEM tests and analysis that we believe to be reliable. SEM will not be held responsible for inaccuracies or omissions contained therein. In all cases – details and values should be verified by the customer.
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 |
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