Deployable origami Yagi loop antenna

A Yagi loop antenna, which is built on an origami spring structure, is presented here. The Yagi loop array can be compressed to 5 cm length by a servo motor which can reduce nearly 70% of the volume of the array. The antenna's body is 20.5 cm long when it is expanded to the working state. The physical parameters of the antenna such as loop's radius and distances between loops are analyzed. The antenna is designed to work at 1.31 GHz. A directional realized gain of 10.4 dBi is observed. The measurements agree well with the designed simulation model.