Design and analysis of slot array antennas on a radial feed line

Antennas based on narrow slots directly coupled to a radial line have been used previously in direct broadcast satellite (DBS) receivers and reported by Ando (1985, 1990). One of the most important features for such antennas is their low cost and low loss feeding line, making it ideal for DBS (11.7 to 12.5 GHz operation). Most of the designs reported are based on experimental work or at least no systematic design procedure have been shown. This paper shows an easy design procedure based on the analysis of several narrow slots coupled to the line. A final, more accurate analysis can be done for the complete antenna including the coupling effect between slots.