Design of multiple band-notch using meander lines for compact ultra-wide band antennas

In this study, the design of multiple band notch for compact ultra-wide band (UWB) antennas is proposed. The antenna consists of an elliptical radiator, a microstrip-feed line and a ground plane. Four pairs of meander lines (MLs), working as resonators, are added to the antenna to produce a quadruple band notch characteristic, yet without increasing the overall antenna size. Two types of feeding techniques, direct-connected feed and parallel-coupled feed, are used in the resonators. The centre frequencies and bandwidths of the individual notches can be adjusted independently using the dimensions of the corresponding MLs. For verification, the proposed antenna is also fabricated and measured. The return loss, peak gain, efficiency and radiation pattern of the band-notch antenna are studied using both computer simulation and measurement. The pulse responses of the band-notched antennas are also measured and compared with those of single-, double- and triple-band-notch antennas.