This paper describes the radiation characteristics of crank-line antennas radiating a circularly polarized wave. First, the radiation efficiency versus substrate permittivity is evaluated. Second, a 12-cell crank-line antenna of substrate permittivity "r = 1 and antenna height B = 11:85=8 is investigated as a reference antenna, where 11:85 is the wavelength at a frequency of 11.85 GHz. It is fo...

In this paper, a novel corrugated structure at the edges of the Vivaldi substrate is presented. Compared with the Vivaldi antenna without corrugated structure, the new structure has a better radiation pattern. While compared with the traditional corrugated structure, the new structure has a better front-to-back ratio (F/B ratio). Properly chosen thickness and dielectric constant of substrate en...

A set of hybrid microstrip patch and semi-circular cavity antennas is introduced. The semi-circular cavity is implemented using Half-mode Substrate Integrated Waveguide (HMSIW) technique. Different shapes of patch include rectangular, semi-circular and equilateral triangular are excited using proximity effect by the circular SIW cavity at its TM010 mode of operation. The whole structures have b...

This paper describes the design and performance of a circularly polarized antenna for satellite communication applications. The includes monopole patch antenna, split ring resonator, defective ground surface metallic reflector. is designed to operate in multiple frequency bands have high gain. reflector used enhance gain by reflecting signal same phase as transmitted signal, thereby strengtheni...