In this paper, a rectangular microstrip patch antenna operating at 10 GHz was designed on a rubber substrate using CST Microwave Studio. In our work, only a simple patch antenna design was chosen, since our focus is more to prove the idea that rubber can be used in flexible antenna design.
Fig. 2 shows the geometry of the antenna. The dimensions were calculated using the transmission line model. In order to match the radiating patch to the load, the patch is fed from the edge using an inset microstrip line. This feeding method sets the line impedance at 50 Ω by cutting a narrow notch out of the radiating edge far enough into the patch to give the required driving point impedance [18-19]. Table 2 lists the antenna dimensions.