High gain and low cross-polar compact printed elliptical monopole uwb antenna loaded with partial ground and parasitic patches

Abstract

In this paper a low cost, high gain, low cross-polar and compact edge feed printed elliptical antenna with a partial ground plane and parasitic patches is proposed and investigated. The proposed antenna is fabricated on a 1.6mm thick FR4 substrate with dielectric constant of 4.4 and loss tangent of 0.025. The total planar area of the proposed antenna (L × W) is 28 × 24mm 2. Both the simulated and experimental result shows that the proposed antenna provides a frequency range compatible with the ultra-wideband (UWB) standard, i.e., 3.5 GH z-12 GH z frequency band. The radiation pattern produced by the proposed antenna is approximately omnidirectional with in-phase excitation of Surface waves resulting in less cross-polarization level (less than 20 dB) compared to its co-polar component for the entire impedance band width. The maximum measured gain for the fabricated antenna is around 6.27 dBi with an average e±ciency of above 90% throughout the bandwidth. A linear phase response (phase of S 21) accompanied by a constant group delay of 1 ns throughout the measured bandwidth makes the proposed antenna a good candidate for UWB applications.