ANTENNA CONFIGURATION
Figure 1 shows the configuration of the proposed film antenna in planar form.
The antenna is based on a loop antenna in which meandering structure is applied for the miniaturization purpose and a comb-like feeding for effective excitation at multiple frequencies.
Because only isolated resonances can be obtained by the loop antenna, short-bars are introduced to put on the meandering structure in order to enhance the bandwidth. Shape and location of the short-bars are carefully determined
so as the bandwidth of the input characteristics is extended.
Furthermore, the antenna is optimized to maintain the broadband performance even it is folded as shown in Fig. 2.