Design Of An Omnidirectional Antenna With A Compact Size

An omnidirectional antenna with a compact size is presented. The diameter of the proposed antenna is 100mm and the height is similar to 0.1 lambda(L) (12mm). It consists of two dipoles and four shorting pins. With this configuration, the impedance bandwidth of the proposed antenna covers 2.4-2.6GHz. Within the bandwidth, the proposed antenna has a stable bidirectional radiation pattern in the E-plane and the omnidirectional radiation pattern in the H-plane. The geometry of the antenna is investigated and optimised by the ANSYS high-frequency structure simulator. The fabricated antenna is compact enough to be integrated into a communication system. Measured and simulated results are also obtained and compared at the end of this work.