A Novel Inverted Trapezoidal Antenna Fed by a Ground Image Plane and Backed by a Reflector

This paper presents a new ultrawide band inverted trapezoidal antenna. The antenna is fed by a 50 ¿ coaxial cable through an image ground plane and backed by a reflector for the radiation and detection of ultra-short electrical pulses. A 50 ¿ input impedance was achieved over a wide bandwidth by the use of a 3D microstrip line feeding concept. The input bandwidth of the antenna was calculated from simulation and verified by experiment to be more than 4 GHz. The metallic reflector is introduced to eliminate radiation back lobes. Maximum pulse radiation occurs at an elevation angle of 40° and 60° for broadside and edge radiation, respectively.