Carpet Fractal Antenna

This paper describes the design of modified sierpinski carpet fractal antenna which resonates at six frequencies 4 825 5 455 6 265 ghz and 6 805 8 02 and 9 145 ghz.

Carpet fractal antenna.

Fractal technologies allowed us to design miniature antennas and integrate multiple telecommunication services such as cellular gsm 900 and gsm 1800 wireless lan gps and hiperlan into a single. The fractal carpet antenna is resonating at multiple frequencies. Fractal antenna is widely used due to the following important facts 5. To validate the impedance bandwidth results the proposed carpet fractal antenna is experimentally tested using a vector network analyzer and the measured results are found to be closely matching with the simulated ones allowing the antenna to be practically suitable for the afore mentioned wireless applications.

Different performance parameters like radiation pattern gain voltage standing wave ratio return losses are observed at all the frequencies. Design and analysis of new geometry for microstrip patch sierpinski carpet fractal antenna is discussed. This type of wideband antenna displays high self similarity and symmetry. Figure 2 shows the design of a sierpinski carpet fractal antenna starting with a rectangular geometry of single patch antenna.

Sierpinski carpet geometry based rectangular patch fractal antenna is described in this paper. W 0 264 h l 0 412h w reff 0 258 0 8 h 4. Very broadband and multiband frequency response that derives from the inherent properties of the fractal geometry of the antenna. The resonant frequencies for fractal carpet with number of iterations two are shifted left when compared to the number of iterations equal to one.

This is due to the self similarity in the geometry of the antenna. This fractal structure is implemented on square and several iterations are applied on initial shape. Multiband antenna offers multiple telecommunication services in to single device. Sierpinski carpet antenna based on fractal geometry are low profile antennas moderate gain and can be operated at multiband of frequencies leads to a multi functional structure.

As shown in the figure initial design rectangular sierpinski carpet dimensions described abovefor patch is modeled. Fractal antennas are simple light weight and compact in size. The antenna consists of a sierpinski carpet fractal radiator which reduces the overall size of the antenna and it is realized on top of a hilbert slot in the ground layer to achieve required impedance matching. The model of the antenna is as shown in the figure 3.