eng Ansari Education and Research Society Journal of Ultra Scientist of Physical Sciences April 2010 22 1 103 112 juc 905 article Manoj Kumar 1 Department of Electronics, B.R. A.B.U., Muzaffarpur, (INDIA) <p style="text-align: justify;">Theoretical investigation has been carried out to evaluate the effect of plasma medium on the radiation characteristics of pentagonal microstrip antenna. The pentagonal microstrip antenna has been mapped on to circular patch. For this purpose the vector potential and scalar potential have been utilized to get the impressions for the electric field and magnetic field. The collision frequency has also been taken into account. It is observed that there is significant change in the radiation characteristics of pentagonal microstrip antenna. The radiation becomes more omini directional in half space with decreasing value of plasma frequency.</p> https://ultraphysicalsciences.org/paper/905/ Pentagonal Microstrip Antenna