Microstrip-line-fed broadband sleeve monopole antenna

This paper has presented a design of a sleeve monopole antenna fed by a microstrip line. Experimental results show that the impedance bandwidth of the proposed antenna can significantly be improved by selecting suitable sleeve length and spacing. A very small variation in the impedance bandwidth is observed when the ground-plane length varies with a great range. The proposed antenna is very suitable for application in a device with a limited ground-plane dimension.