Series-Fed Binomial Microstrip Arrays for Extremely Low Sidelobe Level

This is the authors' abstract. We don't add key points for this paper.

This communication presents linear and planar binomial arrays for extremely low sidelobe level (SLL) on a single substrate using series feed configuration. Binomial distribution is achieved using tapered patch width. A seven-element linear binomial array using U-shaped series feed is designed and compared with a conventional series-fed array having identical radiating elements. A conventional series-fed array provides a gain of 14.9 dBi and an SLL of -14.5 dB. However, the binomial array provides SLL of -28 dB with 12.5 dBi gain at 5.76 GHz. A planar series-fed binomial array is designed using series and corner feed lines in E- and H-planes, respectively. A 3 × 3 element series-fed planar binomial array is fabricated, and the measured results agree with simulated values. It provides SLL of less than -28 dB in both Eand H-planes with 12.8 dBi gain at 5.76 GHz. Both linear and planar binomial arrays provide extremely low SLL.