A Novel Design of Reconfigurable Monopole Antenna for UWB Applications
Keywords:
Band-notched performance, conductor-backed plane, PIN diode, reconfigurable monopole antenna, UWB wireless communicationAbstract
In this paper, a kind of reconfigurable monopole antenna with multi-resonance and switchable band-notched function is designed and manufactured whose frequency characteristics can be reconfigured electronically to have a singleband notch function in order to block interfering signals from 5.15 GHz - 5.35 GHz HiperLAN, 5 GHz - 6 GHz WLAN or 7.25 GHz - 7.75 GHz for downlink of X-band satellite communication systems. The proposed antenna consists of a square radiating patch, feed-line, and a ground plane with a Fork-shaped conductor-backed plane. By adding an inverted T-shaped and a pair of Lshaped parasitic structures in the ground plane, additional resonances are excited and hence much wider impedance bandwidth can be produced, especially at the higher band, which provides a wide usable fractional bandwidth of more than 135% (3.05 GHz-16.51 GHz). In order to generate reconfigurable band-stop performance, we use a pair of PIN diodes within the antenna configuration. By changing the ON/OFF conditions of the PIN diodes, the antenna can be used to generate a single notch band to isolate and block any interference in the UWB frequency range. The proposed antenna has a small dimension of 12 × 18 × 1.6 mm3.
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