 
 <prompt> Wetin isolators wey dey inside microwave antennas dey make from? Based on di question wey dey above, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: ```One necessary condition for the reciprocity property wey we talk about na 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 pass when e dey transmit, wey fit dey useful for applications like radar.``` 