Planar Hexagonal Antenna with Dual Reconfigurable Notched Bands for Wireless Communication Devices

In this paper, a planar hexagonal antenna with dual tunable notched band using varactor diodes is presented. The designed antenna operates in the frequency range of 2 GHz to 8 GHz and is loaded by a complementary split ring resonator (CSRR) to achieve the notch-band characteristics. The CSRR produced two stop-bands at the frequencies 3 GHz and 6.8 GHz. In order to obtain the reconfigurability, one varactor diode was used on each ring of the CSRR. The variation of the DC bias of the diodes produced double notched bands yielding a tunable coverage in the 0.6 GHz and 1.6 GHz ranges. The continuous agility and the wide tuning range of the notched bands are the major advantages of this structure. The antenna prototype was manufactured and a good agreement has been achieved between the measured and simulated results. The proposed antenna can be a good candidate for wireless applications that cover the UMTS, the Wi-Fi and the WiMAX bands