 
 <prompt> Wetin dey affect how materials for antenna and transmission medium dey respond? Based on di question wey dey above, write something wey get di answer. E fit be 1 - 20 sentences. Context: <response>: ```One important condition wey dey necessary for the reciprocity property wey we talk about be say the materials wey dey inside the antenna and transmission medium dey linear and reciprocal. Reciprocal (or bilateral) mean say the material dey respond the same way to electric current or magnetic field whether e dey go one direction or the opposite direction. Most materials wey dem dey use for antennas dey meet these conditions, but some microwave antennas dey use high-tech components like isolators and circulators, wey dey made of nonreciprocal materials like ferrite. Dem fit use these things give the antenna different behavior when e dey receive compared to when e dey transmit, and this fit dey useful for applications like radar.``` 