the primary active element being centre-fed and substantially straight, e.g. Yagi antenna

Full Title

Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic > using a secondary device in the form of two or more substantially straight conductive elements (log- periodic antennas H01Q11/10; constituting a reflecting surface H01Q19/10) > the primary active element being centre-fed and substantially straight, e.g. Yagi antenna