Band-notched Ultra-wideband Slot Antenna Research Articles

A novel reconfigurable band-notched ultra-wideband slot antenna for cognitive radio systems

A novel reconfigurable band-notched ultra-wideband slot antenna for cognitive radio systems

Band-notched UWB slot antenna

This article presents a new design of ultrawideband (UWB) microstrip slot antenna with band-notched function around 5–6 GHz to avoid any interference from the wireless local area network (WLAN) systems. The proposed antenna consists of a square radiating stub with a rotated C-ring slot, a feed-line and a slotted ground plane with an S-shaped parasitic structure inside an extra rectangular slot. By cutting a rectangular slot on top of the ground plane and also by embedding an S-shaped parasitic structure inside the slot, a new resonance at the higher frequencies is excited and hence much wider impedance bandwidth can be produced, which provides a wide usable fractional bandwidth of more than 135%. In the proposed design, to generate the WLAN band-stop property, the rotated C-ring slot was inserted at the radiating stub. Simulated and measured results are presented to validate the usefulness of the proposed antenna structure for UWB applications. The proposed monopole antenna configuration is simple, easy to fabricate and has a small size of 20 × 20 × 0.8 m3. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1744–1747, 2014

Band-Notched Ultra-Wideband Slot Antenna with a Pair of ARC-Shaped Metallic Arms

A compact band-notched ultra-wideband (UWB) circular slot antenna to prevent interference from existing wireless local area network (WLAN) systems is presented. The proposed antenna has an interior circular stub for impedance matching and a pair of arc-shaped metallic arms embedded along the circular slot edge. The desired band-notched property can be obtained by adjusting the parameters of the arc-shaped metallic arms. In particular, this paper provides both the simulated surface current and magnetic field distributions to explain how the band-notched capability works. Details of the experimental results of the constructed prototypes are discussed.

IMPROVED DUAL BAND-NOTCHED UWB SLOT ANTENNA WITH CONTROLLABLE NOTCHED BANDWIDTHS

A compact dual band-notched ultra-wideband slot antenna with sharp band-notched characteristics and controllable notched bandwidths is presented. The antenna is formed by a rectangular slot with chamfered corners on a printed circuit board ground plane, a T-shaped stub and two sets of compound band- notched structures. The compound band-notched structures are employed to generate desired lower and upper rejected bands with satisfactory skirt characteristics and su-cient rejection bandwidths. Moreover, the bandwidth of either the lower or upper rejected band can be independently adjusted by changing the size and location of the corresponding band-notched structure. Finally, a UWB slot antenna with two rejected bands at WiMAX/WLAN frequencies is successfully simulated, designed, and measured, showing good impedance matching, stable gain and near omnidirectional radiation patterns.