Frequency reconfigurable antenna with defected ground plane and parasitic element for multi-standard wireless applications

In this paper, a frequency reconfigurable planer antenna with defected ground plane (DGP) is presented for covering two wireless standard applications bands (2 GHz and 5.2 GHz). Where a parasitic element is added on the ground plane to shift the frequency range from 5.2 GHz to 2 GHz after connect it with the ground layer. The addition of the parasitic element with the ground plane helps to switch to the lower frequency without modifying the geometry of the antenna. Additionally, it avoids the disturbance that could happen due to adding a radiation element such as PIN or varactor diode close to the antenna radiation layer. Computer Simulation Technology (CST) microwave studio is exploited to simulate the model and obtain better results. Then, the antenna was fabricated and measured practically for validation and comparing the measurement results with the simulated results.