Wideband/Dual-band Reconfigurable Filtering Antenna for Wireless Communication Systems

In this paper, a novel reconfigurable wideband/dual-band filtering antenna loaded with coupled lines and stepped-impedance stubs is proposed for Wireless Communication Systems. The proposed antenna consists of a reconfigurable filter and a wideband antenna. In this design, a wideband band pass filter (WBPF) with high selectivity is presented by employing two-section coupled lines, a short-circuit stub, and two open-circuit stepped-impedance stubs. After adding a coupled line, the WBPF is transformed to a dual-band band pass filter (DBPF). A reconfigurable wideband/dual-band filtering antenna is obtained through the integration of the reconfigurable filter and a wide-band monopole antenna. The functions of the filtering antenna are controlled by the PIN diodes. The operating impedance bandwidth of the wideband filtering antenna is from 1.27 to 3.47 GHz, while the dual-band filtering antenna is from 1.25 to 1.88 GHz and from 2.84 to 3.24 GHz. Details of the antenna design are shown, and the simulation for the constructed prototype are also exhibited and discussed.