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Although this article is limited to describing reflections on conducting lines , this is essentially the same phenomenon as optical reflections in fibre-optic lines and microwave reflections in waveguide s. Reflections cause several undesirable effects , including modifying frequency response s , causing overload power in transmitter s and overvoltage s on power line s. However , the reflection phenomenon can also be made use of in such devices as stubs and impedance transformers .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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