Abstract :
The utilization of frequency bands above 20 GHz for short distance digital radio links requires relatively small antennas (diameter less than one meter) adapted to the particular frequency band. Due to the competitive market situation the antennas have to be very cheap in series production. Furthermore, the antennas have to meet the system relevant stringent electrical requirements concerning reflection coefficients and the radiation pattern envelopes. In 1992, the ETSI published parameters of radio relay systems operating at 23, 26 and 38 GHz bands, among them antenna radiation pattern envelopes. According to local interference requirements antennas with moderate or very stringent sidelobe suppression may be necessary. Based on these requirements, an antenna family has been developed, which allows an easy adaption to different frequency bands and sidelobe requirements using low-cost components and technologies
