ABSTRACT
Microstrip patch antennas are recently used in wireless detection applications due to their low power
consumption, low cost, versatility, field excitation, ease of fabrication etc. The microstrip patch antennas are also
called as printed antennas which is suffer with an array elements of antenna and narrow bandwidth. To overcome
the above drawbacks, Flame Retardant Material is used as the substrate. Rectangular shape of microstrip patch
antenna with FR4 material as the substrate which is more suitable for the explosive detection applications. The
proposed printed antenna was designed with the dimension of 60 x 60 mm2
. FR-4 material has a dielectric
constant value of 4.3 with thickness 1.56 mm, length and width 60 mm and 60 mm respectively. One side of the
substrate contains the ground plane of dimensions 60 x60 mm2
made of copper and the other side of the substrate
contains the patch which have dimensions 34 x 29 mm2
and thickness 0.03mm which is also made of copper.
RMPA without slot, Vertical slot RMPA, Double horizontal slot RMPA and Centre slot RMPA structures were
designed and the performance of the antennas were analysed with various parameters such as gain, directivity, Efield, VSWR and return loss. From the performance analysis, double horizontal slot RMPA antenna provides a
better result and it provides maximum gain (8.61dB) and minimum return loss (-33.918dB). Based on the E-field
excitation value the SEMTEX explosive material is detected and it was simulated using CST software.
Keywords: - gain, directivity, return loss, E-field, H-field.