Automotive multi- and broadband monopole antenna for GSM, WLAN and UWB applications

Two different approaches for an automotive multi-and broadband monopole antenna for GSM, WLAN and UWB applications will be presented. Both allow covering the complete relevant frequency range worldwide in one antenna structure. The two antennas consist of one broadband structure for frequencies above 1.7 GHz and an additional folded arm for the lower frequencies. The first approach is based on a disc-monopole. In addition it has a folded arm on its top to cover the mobile phone services GSM 900 and AMPS. It has a height of 60 mm. The second approach has a 5 mm reduced height. So it achieves a height of 55 mm, which is the typical goal of many car manufacturers. The antenna is based on a folded metal strip construction. The amplitude and phase behaviour of the two antennas were measured. The derived impulse responses will be discussed with focus on the UWB frequencies.