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SUMMARYThis paper describes the method of configuration and the radiation properties of a new type of multi-band planar antenna with a radiating element made of a microstrip antenna (MSA) with a slit-loaded modified Sierpinski Gasket fractal antenna. In order to verify the multiband characteristics of this antenna, triangular MSA elements loaded with slits of a modified Sierpinski Gasket structure are fabricated. According to the experiment, the present test antenna exhibits excellent multiband characteristics in the C-band and X-band. Also, the measured values of the return loss and the radiation patterns are in good agreement with the results given by an electromagnetic simulator in the range meaningful for design. Thus, this antenna system is a useful format for a multiband planar antenna.

This paper demonstrates a novel multiband rhombic microstrip antenna (MSA) with multiple slots printed on a single-layer PTFE substrate. The antenna is fed by a coplanar gap coupled with a V-shaped patch. Three inverted V-shaped slots are assumed on the rhombic patch and hence four resonant frequencies are obtained. Broadside radiation patterns and gain of over 5.0 dBi are also obtained. Experiments were carried out to verify the results estimated by IE3D simulator. Good agreements between simulated and measured results are confirmed. To further evaluate the performance, rhombic MSA with six inverted V-shaped slots is also investigated. Again, this antenna model accomplishes excellent multiband performances over the seven observed frequencies. Thus, the rhombic MSA with multiple slots is well suited as an alternative design for a multiband planar antenna.

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