Triband Circularly Polarized Koch Fractal Boundary Microstrip Antenna

A novel single-layer single-probe-feed asymmetrical fractal boundary microstrip antenna is considered for triband circular polarization (CP) operation. Four different structures-without-slot (Ant1), rectangular (Ant2), fractal (Ant3), optimized-fractal-slot (Ant4)-are studied for multiband CP radiation. Perturbation in the structure for triband CP radiation is introduced by employing optimized asymmetrical Koch fractal curves as boundaries of a square patch and embedded rectangular slot. The generated 3-dB axial-ratio bandwidths of Ant 4 are 3.2%, 1.6%, and 3.0% at operating frequencies around 2.45, 3.4, and 5.8 GHz, respectively. Measured results that are in close agreement with the simulation results demonstrate that the proposed antenna is well suited for the WLAN/WiMAX wireless applications.

[1]  J. Romeu,et al.  The Koch monopole: a small fractal antenna , 2000 .

[2]  Pezholil Mohanan,et al.  Compact wideband Koch fractal printed slot antenna , 2009 .

[3]  Jean-Fu Kiang,et al.  Compact Multi-Band H-Shaped Slot Antenna , 2013, IEEE Transactions on Antennas and Propagation.

[4]  Y. Yin,et al.  Compact Tri-Band Rectangular Ring Patch Antenna with Asymmetrical Strips for WLAN/WiMAX Applications , 2010 .

[5]  V. Reddy,et al.  Compact Circularly Polarized Asymmetrical Fractal Boundary Microstrip Antenna for Wireless Applications , 2014, IEEE Antennas and Wireless Propagation Letters.

[7]  Wing Chi Mok,et al.  Single-Layer Single-Patch Dual-Band and Triple-Band Patch Antennas , 2013, IEEE Transactions on Antennas and Propagation.

[8]  K. J. Vinoy,et al.  On the relationship between fractal dimension and the performance of multi-resonant dipole antennas using Koch curves , 2003 .

[9]  D. D. Krishna,et al.  CPW-Fed Koch Fractal Slot Antenna for WLAN/WiMAX Applications , 2008, IEEE Antennas and Wireless Propagation Letters.

[10]  Triple-band circularly polarized slotted patch antenna for GPS and UMTS systems , 2010, 2010 10th Mediterranean Microwave Symposium.

[11]  Huiqing Zhai,et al.  A Compact Printed Antenna for Triple-Band WLAN/WiMAX Applications , 2013, IEEE Antennas and Wireless Propagation Letters.

[13]  Yong-xin Guo,et al.  A single-feed tri-band circularly polarized dual-annular slot antenna for wireless applications , 2012 .

[14]  Kin‐Lu Wong,et al.  Dual-band circularly-polarized square microstrip antenna , 2001 .

[15]  R.H. Patnam,et al.  Broadband CPW-Fed Planar Koch Fractal Loop Antenna , 2008, IEEE Antennas and Wireless Propagation Letters.

[16]  H. Yang,et al.  Surface waves of printed antennas on planar artificial periodic dielectric structures , 2001 .

[17]  Keum Cheol Hwang,et al.  Triple-Band Unidirectional Circularly Polarized Hexagonal Slot Antenna With Multiple L-Shaped Slits , 2013, IEEE Transactions on Antennas and Propagation.

[18]  Y Sung,et al.  Dual-Band Circularly Polarized Pentagonal Slot Antenna , 2011, IEEE Antennas and Wireless Propagation Letters.

[19]  Yue Gao,et al.  Stacked-Patch Dual-Polarized Antenna for Triple-Band Handheld Terminals , 2013, IEEE Antennas and Wireless Propagation Letters.

[20]  Jordi Romeu,et al.  On the behavior of the Sierpinski multiband fractal antenna , 1998 .