The invention discloses a Terahertz
broadband high-
gain Vivaldi antenna based on a CPW (Coherent Plane
Waveguide) rotary slot
line structure, and belongs to the field of Terahertz communication. The antenna adopts an integrated single-layer
metal structure on the top layer of a
dielectric substrate, and is divided into a
radiation arm and a CPW rotating slot line
balun along the axial direction. The inner side edge of the
radiation arm is a smooth exponential change curve, and the middle exponential gradual change groove forms a
broadband traveling wave
radiation channel. Periodic grid
choke grooves are loaded on the outer side edge so as to suppress
edge surface waves and improve a directional diagram. The feed part adopts a CPW to slot line
balun structure to realize conversion from an unbalanced mode to a balanced mode, and a fan-shaped radial
branch knot is utilized to form a
broadband virtual
short circuit boundary at a
feed point to ensure unidirectional efficient transmission of energy. In addition, a group of string-shaped director patches are arranged in the opening area of the exponential gradual change groove along the central axis, and the wave beam is guided through
phase correction. The terahertz planar antenna effectively solves the problems of limited bandwidth and insufficient
gain of the terahertz planar antenna, and has the characteristics of compact structure, easiness in integration, excellent radiation performance and the like.