Study on Asymmetric Tapered Slotline Antenna

Two novel but simple structures of asymmetric tapered slotline antenna (TSA) with synthesized radiation pattern is proposed. By adjusting the profiles of asymmetric conducting plates respectively, cutting the corrugated slots on side-edges, and setting a backed plate for single-TSA structure, the synthesized pattern in vertical plane can meet the requirement of specific application. The prototypes are considered as the scaled sample at 10 GHz for base-station of mobile communication system. A single-TSA sample is designed, its measured vertical pattern has 4deg beam tilting, null filling in the lower part, and suppressed side lobe (-19.9 dB) in the upper part; its HPBW in horizontal pattern is 65deg; it has 11.7 dBi of directive gain, and 3:1 frequency coverage (5.56~16.8 GHz) for VSWRles2:1. Another twin-TSA sample consists of a pair of asymmetric TSAs backed each other with a common excitation by a microstrip line, its simulated vertical pattern at 10 GHz has 7deg beam tilting in both sides, null filling in the lower part and suppressed side-lobe in the upper part; 34deg HPBW in vertical pattern and 60deg in horizontal pattern; and 8.4 dBi of directivity for each sides