Band-Notch Slot Antenna with Enhanced Bandwidth by using Ω-Shaped Strips Protruded inside Rectangular Slots for UWB Applications

摘要

A novel method for designing a new slot antenna with band-notch characteristic for UWB applications has been presented, in this paper. The proposed antenna consists of a slotted ground plane with an extra rectangular slot on its top, in which a Ω-shaped strip is protruded, and a square-ring radiating stub in which a Q-shaped strip is protruded. By inserting the rectangular slot with a Ω-shaped strip which is protruded inside this slot, in the ground plane, additional resonance is excited and hence much wider impedance bandwidth can be produced, especially at the higher band, which consequently results in a wide usable fractional bandwidth of more than 125% (3.07-14.03 GHz), In order to generate a band-notch characteristic, we use a square-ring radiating stub with a Ω-shaped strip which is protruded inside this radiating stub. The measured results reveal that the presented slot antenna offers a wide bandwidth with a band-notch operation which notches the WLAN band (5.02-5.97 GHz). The designed antenna has a small size of 20×20 mm~2. Good VSWR and radiation pattern characteristics are obtained in the frequency band of interest.