Microstrip antennae are becoming popular with miniaturization of communication
gadgets. With the rapid development of integrated circuits and wireless
communication systems, compact wideband antenna design has become a challenging
task (Bahl and Bhartia, 1980; Garg et al. 2001; Balanis, 2005; Sharma et al., 2009;
Ahamed et al., 2012; Gupta and Singh, 2012; Majumder, 2013; Mathpati and Rathod,
2015; and Raut and Nagrale, 2015). Printed antennae are widely used in a variety
of wireless communication applications. Patch antennae are used, where size,
weights, performance and ease of installation are major constraints. Many researchers
are working on exploring suitable substrate materials for improving the performance
of patch antennae (Yoon and Kim, 2000; Low and Wu, 2007; Chattopadhyay et al.,
2009; Punetha and Mehta, 2014; and Nagendra et al., 2015).
A microstrip antenna consists of conducting patch separated from ground plane
by dielectric substrate, as given in Figure 1. When different dielectric materials are used
together for substrate, it is known as composite microstrip patch antenna (Figure 2).