Novel microstrip antenna array fed with left-handed trsmission line

A novel microstrip antenna array fed with composite right/left- handed transmission line (CRLH-TL) was presented. The antenna utilizes the positive phase delay of the CRLH-TL to compensate the negative phase delay of the ordinary right-handed transmission line so that the equal phase feeding between the elements of the antenna is guaranteed. As a result, the offset of the radiation beam of the antenna owing to the phase delay is avoided and the gain is increased. The simulation and experimental results indicate that this antenna is of advantages of small dimension, broad frequency bandwidth and easy design for the feeding structures compared with the same type of conventional antenna, and it is applicable to the practical microwave system.