Design of a dual-band Verre de Champagne Fractal CPW antenna for LTE and aircraft altimeter application

The work scheme of this paper represents the new design of a dual-band coplanar waveguide feed (CPW) antenna with a concept of fractal and coplanar to provide dual-band and Omni-directional radiation. Each Verre de Champagne fractal geometry response an individual frequency by the larger shape operates at lower frequency whereas the smaller shape operates at RF altimeter frequency band. This type of antenna can response the demand in aviation industry which is easy to integrate with system device, expedient fabrication and required operating frequency at 4.3GHz with bandwidth more than 100MHz for aircraft radio altimeter. Matching step-impedance between antenna patch and waveguide feed is applied in this fractal CPW antenna which has been achieved the improved return loss (S₁₁) below -10dB on both operating frequencies. The return loss of the antenna also can correct by using blending ground plane technique which makes the suitable capacitance and inductance on ground plane. The commercial software “CST Microwave Simulation” is use to optimize and simulate this antenna research.