A broadband slot-loaded trapezoid microstrip antenna

An experimental study of a new broadband design of a slot-loaded trapezoid microstrip antenna is presented. The two radiating edges of the trapezoid m icrostrip, patch have a length ratio of 2.0, and a pair of narrow slots of unequal lengths are loaded close to the nonradiating edges of the trapezoid patch. The proposed design can cause a group of three adjacent resonant mo des excited in the vicinity of the fundamental resonant mode of the unslott ed trapezoid microstrip antenna. This behavior leads to significant enhance ment in the antenna's impedance bandwidth. Results show that the proposed n ew antenna can have an impedance bandwidth greater than three times that of rectangular or circular microstrip antennas. (C) 2000 John Wiley & Sons, I nc.