Miniaturized multi-element monopole antenna

An electrically small antenna has been developed, presented and discussed. The featured antenna is derived from the traditional monopole antenna. Additional elements are combined and the topology is further modified to display a radiation characteristic similar to a vertically oriented monopole antenna. The antenna is further miniaturized for enhanced mobility and compactness. The miniaturized multi-element monopole antenna is less than 0.03 λ in vertical height. 2:1 VSWR bandwidth of the proposed antenna is measured to be similar to a typical electrically small monopole antenna. However, the antenna features excellent radiation efficiency and is easily matched to a 50 ohm feed line. To further enhance the bandwidth of the antenna, a dual-band multi-element antenna is designed by combing two multi-element antennas through parasitic coupling. The miniaturized dual-band multi-element antenna displays improved bandwidth, omnidirectional radiation patterns, and excellent gain.