A New Compact Planar Antenna for Switching between UWB, Narrow Band and UWB with Tunable-notch Behaviors for UWB and WLAN Applications

摘要

This paper presents continuously switchable behavior between narrowband (5.5 GHz WLAN), wideband (3-11 GHz UWB), and band-notched UWB using a miniaturized novel resonator. Three essential responses can be achieved from the same resonator by adequately utilizing the two capacitors. The first essential narrowband behavior is obtained from the resonator at 0.1pF is WLAN (5.5 GHz) operating frequency band. The second wideband behavior is achieved from the resonator to work between 3-11 GHz UWB frequency band. This behavior is achieved by changing the value of capacitors from 0.1 pF to 0.8pF. Finally, band-notched UWB response has been achieved by adjusting the position of capacitors, and this bandnotch behavior can also be tuned continuously between WLAN and WiMAX frequency band. The antenna designed for these objectives have a compact size of 24x30.5 mm(2) including the particular ground plane. The clean and consistent radiation pattern of the antenna is observed because of the placement of the resonators in the partial ground plane. The antenna is also fabricated, and its response to three behaviors is measured for validation.