Propagating and radiating properties of Broadband Hollow Core fibers in Terahertz spectral region

In this paper Hollow Core Microstructured Fibers consisting of a regular arrangement of dielectric tubes of Teflon are numerically investigated in order to obtain efficient and highly directive aperture antennas for Terahertz applications. The good aperture field distribution allow to obtain high power coupling coefficient with freely propagationg gaussian beams, narrow beamwidth and low side lobe level over a wide range of frequencies as wide as 1.5THz centered at 2.25 THz. Antenna performances are not affected by fiber dimension allowing a more flexible design in order to better meet the requirements of a particular application. An array configuration of fibers arranged in a hexagonal lattice have been also investigated.