Telecommunications

Market Segment Discussion Magnetic materials and assemblies are used in such diverse telecommunications applications as: Cell phone speakers and microphones Cell phone on-off switches Electromagnetic transducers Microwave collimators Power supply inductors & transformers Signal filters Signal transformers

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When electric current travels in a wire under DC (direct current) conditions, it is almost uniformly dispersed throughout the cross-section of the wire. Under AC (alternating current) conditions, and especially at higher frequencies, the current carrying electrons are located mostly on the skin of the conductor. At microwave frequencies, the current doesn't flow in a wire, it is "contained" in a waveguide. Permanent magnets and Electromagnets are used to focus, amplify and guide the microwaves. This illustration is of a microwave relay tower with several different antenna types visible. Transmission of the microwave signal to and from the antennas is by waveguide.

Applications Engineering
Whether your company has sophisticated in-house magnetics design capabilities or a more modest facility, our Applications Engineers are ready to support your efforts through the entire product life cycle including:
• Conceptualization • Initial design • Prototyping • Design optimization • Pre-Production trials • Validation testing support • Production issues • Cost reduction activities • Next generation designs Additional capabilities: • Magnetic field mapping • Magnetic properties testing	Magnetic Toner Roll Assembly Field Map

Application Example

Magnetic materials serve several purposes in the Telecommunications Market. For example, with the advent of cellular telephones came the need for high volume manufacture of small magnets for miniature microphones and speakers. These are economically manufactured of "sintered" alnico. A popular style of phone uses a "flip" cover over the keys. When the cover is opened, the phone turns on - - automatically. This is usually accomplished with a non-contact switching system using a sintered alnico magnet and a reed switch. The presence of the magnetic field passing through the conductors of the switch causes them to "pull" together, closing the circuit. When the magnet is moved away from the switch, the circuit opens.