Experimental Investigation of an UWB Binomial Monopole with Modified Ground Plane Mohamed A. Habib* (1) , Azzeddine Djaiz (1) , Mourad Nedil (2) , and Tayeb A. Denidni (1) (1) INRS-EMT, University of Quebec, Mtl., QC, H5A1K6 (2) LRTCS-UQAT, Val d’Or, QC, E-mail: habib@emt.inrs.ca Introduction In nowadays, portable communication devices aim to exchange a huge quantity of information such as data, video frames which presents several challenges to the designers. The UWB standard offers a bandwidth from 3.1GHz to 10.6GHz that can solve the high-rate data trade issue. Printed antennas are suitable candidates to be considered for portable devices, in respect to their low cost, light weight and conformal structures. However, they suffer from a lack of bandwidth that does not exceed several percents. To broaden printed antennas bandwidth, several techniques have been explored such as surface meandering, coupled patches, or near frequencies resonators [1]. In previous work [2], apertures have been coupled to patches in order to ensure impedance matching over a wide range of frequency. An efficient technique to increase significantly the antenna bandwidth is to use modified shape monopole antennas [3, 5]. In this paper, we perform an experimental investigation of an UWB antenna. We have explored a modified shape antenna based on a binomial curve law [6]. In simulation, this antenna achieved the desired UWB bandwidth. This paper is about experimental investigation of this modified monopole. Measurements reveal a frequency response from 3GHz to 10GHz with a return loss below -10dB. Radiation patterns are omnidirectionnal in the H-plane. However, in the E-plane, they show a dipole-like behavior at low frequencies, and monopole-like behavior at high frequencies. Antenna Design The layout of the proposed antenna is shown in Figure 1. The antenna is etched on Rogers 5880 substrate with a permittivity of 2.2 and a height of 1.575mm. Since the antenna is realized with coplanar technology, all the metal is removed from one side of the substrate. On the metallic side, a CPW line is etched. The central line has 1.87mm of width and is spaced with 0.2mm from each lateral ground plane side, as showed in Fig.1a.