Radiation Field from a Metaloop Antenna with a Traveling-Wave Current

This paper investigates the radiation field from a metaloop antenna, using a generalized loop antenna model. It is assumed that a forward current flows without attenuation. The investigation is performed at the nion and hion frequencies, where the peripheral length is one guided wavelength. We focus on two current cases: C-s type current and C-t type current. The radiation field generated on the antenna axis normal to the antenna plane is formulated for these currents. It is found that, when C-s and C-t type currents coexist, the radiation field is increased at the nion frequency and decreased at the hion frequency.