Reconfigurable X-Band Antenna with Notch Band Characteristics using EBG

A fractal based inverted triangular shaped monopole antenna for X-band has been designed and reconfigured to reject narrow band frequencies from 8.90 GHz to 10.90 GHz. The antenna proposed has a peak gain ranging from 3.36 dBi to 6.18 dBi with an average peak gain of 4.95 dBi. Two double inverted C-shaped electromagnetic bandgaps (EBG) were symmetrically placed and implemented on the ground surface of the antenna to generate a notch frequency band. Two varactor diodes are integrated onto the EBG to reconfigure the notch frequency band electronically. Varactor diodes were tuned from 0.15 pF to 1.90 pF to reconfigure the notch frequency band from 8.90 GHz to 10.90 GHz. A comparative simulation and measured results of the fabricated model are analyzed and discussed. The size of the proposed antenna is 1.57λ
g
× 1.25λ
g
where, λ
g
is the guided wavelength at lowest cutoff frequency, 7.95 GHz.