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.
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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:
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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
Design Assistance
Applications engineers at each of our manufacturing locations can assist you with your needs, such as.
- Magnetic modeling: 2D, Radially symmetric, 3D, Temperature dependence
- Design relationships to your Hall sensor and application Specifications
Complete analysis includes studying the effects of the operate and release point of the Hall sensors compard to the magnetic output waveform
- Quadrature encoders
- Switches and latches
- Ratiometric / Linear Halls
- Pulse counters
- Complex holding force calculations
- Insert and overmolding designs
- Manufacturability analysis
- Measurement capability to verify design
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.