Morphing Origami Conical Spiral Antenna Based on the Nojima Wrap

A two-arm Nojima origami conical spiral antenna (CSA) is designed. The antenna is based on the origami Nojima wrap pattern that enables the antenna to morph from a planar dipole to a conical spiral. The design equations of the Nojima origami CSA are presented and its performance is studied using simulations and measurements. The reflection coefficient, input impedance, gain, and axial ratio of this antenna are investigated over a wide frequency band. The radiation patterns of this antenna are also examined. A prototype of an origami Nojima CSA with 1.5 turns is manufactured and measured.