According to the communication demands of communication system used in the UAV (Unmanned Aerial Vehicle)\ncommunication system, a ladder-shaped open-slotted antenna design is presented. The impedance effects and directional\nradiation performance of designed antenna are improved with adopting a pair of L-shaped narrow slot and a passive resonator\namong the antenna structures. The measured results show that the impedance bandwidth of the antenna is about 90%, the\nfrequency range can cover from 3 GHz to 12 GHz, and the antenna has a relative small size just as 22mmÃ? 24 mm. The antenna\nis realized through adopting improved ground structure, and its electrical length is increased simultaneously. To improve its\nimpedance matching effect, the ladder structure is adopted in the antenna. The measured results show that the proposed design\nscheme is useful and effective, the antenna size can be controlled within the size of 22mmÃ? 24mm and the good impedance\nbandwidth can also be obtained, its frequency bandwidth is from 3 GHz to 13.2 GHz, and the designed antenna has good group\ndelay characteristics at the same time.
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