Abstract
A top-hat monopole Yagi antenna is presented to produce an end-fire radiation beam. The antenna has an extremely low profile and wide operating bandwidth. It consists of a folded top-hat monopole as the driven element and four short-circuited top-hat monopoles as parasitic elements. A broad bandwidth can be achieved by adjusting the different resonances introduced by the driven and parasitic elements. A prototype operating at the UHF band ( ${\mathbf{f}_\mathbf{0}} = \mathbf{550}\;\mathbf{MHz}$ ) is fabricated and tested. Measured results show that a fractional bandwidth ( $\vert{\mathbf{S}_{\mathbf{11}}}\vert ) of 20.5% is obtained while the antenna height is only ${\mathbf{\lambda }_\mathbf{0}}/\mathbf{28}$ at the center frequency.
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