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No. It has nothing to do with antenna material. At least it should not...the material the antenna is made of has impedance of 50 ohms?
use the antenna as a receiver. so how do i make sure the antenna has 50 ohms impedance?
Basically yes. In practice, antenna impedance can be measured with an antenna analyzer https://en.wikipedia.org/wiki/Antenna_analyzer or a vector network analyzer (VNA) https://en.wikipedia.org/wiki/Network_analyzer_(electrical)#VNAso measure voltage and current and that will tell me the impedance of the antenna at the particular frequency of operation?
so measure voltage and current and that will tell me the impedance of the antenna at the particular frequency of operation?
when we say an antenna has an impedance of 50 ohms, that means the antenna is connected to a load of 50 ohms and the load is not part of the antenna?
Actually not at any frequency. 75 ohm at the frequency where the dipole length equals λ/2.Lets start with the very basics, open dipole antenna this has 75 Ohm resistance at any frequency at transmitting or receiving.
Actually not at any frequency. 75 ohm at the frequency where the dipole length equals λ/2.
Considering that the questions show rather shallow RF knowledge, it should be at least mentioned that the dipole frequency range is small and impedance outside this range completely different.