Compact Microstrip-fed Monopole Antenna with Modified Slot Ground Plane for UWB Applications

摘要

A novel UWB microstrip-fed monopole antenna with modified structure has been designed and analyzed. The main body of the antenna under consideration consists of a quasi square radiating patch with tapered steps and a modified slotted ground plane. Due to the repeatedly cutting of three notches on the radiating patch and also inserting a rectangular slot and three tapered steps on the ground plane, a new resonance is excited and a wide bandwidth is obtained. By applying two sleeves with proper sizes to the antenna structure, an even wider impedance bandwidth is achieved. The antenna has a compact size of 18 × 12 × 1.6mm~3 and operates over the frequency range of 2.34 - 21.43 GHz (9.15:1; 160%). The impedance bandwidth improvement process of the proposed antenna is presented and discussed in detail.