Design of an omnidirectional antenna with a compact size

Abstract

An omnidirectional antenna with a compact size is presented. The diameter of the proposed antenna is 100 mm and the height is ∼0.1λ(L) (12 mm). It consists of two dipoles and four shorting pins. With this configuration, the impedance bandwidth of the proposed antenna covers 2.4–2.6 GHz. 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.

Keywords

• antenna radiation patterns
• omnidirectional antennas
• UHF antennas
• dipole antennas
• ANSYS high-frequency structure simulator
• omnidirectional antenna radiation pattern
• bidirectional antenna radiation pattern
• dipole antenna
• E-plane
• H-plane
• geometry
• communication system
• size 100.0 mm
• size 12.0 mm
• frequency 2.4 GHz to 2.6 GHz