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thank you.... but i need to know ... what effect does these things have on the properties of a microstrip antenna.. like increasing dielectric constant would
decrease or increase other properties of microstrip ( frequency,BW...etc...)..
for some cases, selection substrate can be an efficiency factor where the freq working, as example for high freq to get small dimension antenna and with best parameter we can choose substrate which have low dielectric, its complex and variety
When the dimensions of the antenna are constant then the gain is reduced and the impedance changes and thus the resonance frequency.
Other properties as the bandwidth or the radiation pattern should also change.
Generally you would use a low loss substrate because with a lossy substrate the gain is reduced and perhaps other antennas can than provide better a performance.