With development of communication with integration technology, size reduction of microstrip antennas is becoming an important design consideration for practical applications. Here a new microstrip antenna with Koch shaped fractal defects on the patch surface is presented. Using this method, the overall electric length of the antenna is increased largely and hence the size of antenna is reduced to 85%, compared to an ordinary microstrip antenna with the same resonance frequency. Antenna is simulated using high frequency structure simulator (HFSS) V.10 which is based on finite element modeling (FEM). Finally antenna is fabricated on RO4003 substrate. Measurement results are in good agreement with simulated results.
2. Sinati, R. A., CAD of Microstrip Antennas for Wireless Applications, Artech House, Norwood, MA, 1996.
3. Wang, H. Y. and M. J. Lancaster, "Aperture-coupled thinfilm superconducting meander antennas," IEEE Transaction on Antennas and Propagation, Vol. 47, 829-836, 1999.
4. Waterhouse, R., Printed Antennas for Wireless Communications, John Wiley & Sons Inc, 2007.
5. Borja, C. and J. Romeu, "On the behaviour of koch island fractal boundry microstrip patch anetnna," IEEE Transaction on Antennas and Propagation, Vol. 51, No. 6, July 2003.
6. Kim, L.-K., J.-G. Yook, and H.-K. Park, "Fractal-shape small size microstrip patch antenna," Microwave and Technology Letters, Vol. 34, No. 1, July 2002.