Harmonic Suppression Dual-band Dipole Antenna with Parasitic Elements and a Stub

At first, the antenna resonates at 900 MHz and 2.7 GHz. [...]a parasitic element is added into each of the dipole's arm to tune the second frequency band to 2.4 GHz to fit into wireless application. [...]the presence of two parasitic elements has generated an unwanted harmonic at 4.0 GHz. [...]a stub has been integrated into the antenna's terminal (feed line) to suppress the 4.0 GHz frequency. A stub is used to eliminate harmonic at 4.0 GHz. [...]the antenna only operates at 0.8 GHz and 2.4 GHz with reflection coefficients of -16.64 dB and -25.96 dB. The presence of stub at the feed line of the antenna has suppressed the unwanted harmonic. [...]the dual-band harmonic suppression antenna is formed from the employment of two parasitic elements and a stub.