Wave sump
A wave sump or waveguide absorber is a terminating piece for a waveguide in microwave technology . It serves this reflection-free or low-reflection finish .
functionality
If the waveguides are not terminated or terminated incorrectly, the reflection factor changes suddenly, which is why a considerable part of the energy supplied is reflected . This jump in impedance weakens the transmitted signal and can reduce the signal quality or lead to other disturbances.
In the case of a wave sump, the wave resistance changes continuously over a length of several wavelengths due to an increasingly thick wedge of absorbent material. This weakens the incoming high-frequency wave in "infinitesimal" steps and only reflects a small proportion. Lossy ferrites can be used as the material , which dampen the wave amplitude .
The name wave sump came about because the waves that are fed in seem to disappear. The absorbed wave energy is converted into heat.
There are two requirements for the wave sump:
- small reflection factor ; the ratio of the amplitudes of the outgoing and incoming waves should be as small as possible
- sufficient resilience; the component must be able to release the generated heat to the environment.
literature
- Frieder Strauss: Basic course high frequency technology: An introduction . Vieweg + Teubner, 2011, ISBN 978-3-8348-8275-2 .
- G. Zimmer: high frequency technology. Linear models, Springer Verlag, Berlin / Heidelberg 2000, ISBN 978-3-642-63082-8 .
Web links
- Reflection-free termination of a dielectric waveguide (accessed November 17, 2017)
- Optimization of complex housings and platinum for microwave circuits (accessed November 17, 2017)
- PHYSICAL INTERNSHIP FOR ADVANCED PEOPLE (accessed November 17, 2017)