A wideband feed network for a Vivaldi antenna array is presented. limitation of current arrays the bandwidth either or element. The proposed consists four antennas fed with an improved to extend useable array. coplanar waveguide-to-slotline-to-microstrip line transitions. has single waveguide input and microstrip output ports. achieved uniform amplitude phase balance impedance 160% from 1 GHz 9...

A study of the diffraction an electromagnetic wave on a dielectric coating with diaphragm over infinite waveguide antenna array has been carried out. The metal is located at some distance from surface array. influence geometric dimensions and its grating modulus reflection coefficient incident in waveguides investigated. Dielectric coatings different values constant are considered.

A high-gain low sidelobe level array antenna that is fed by a radial waveguide and designed to operate over a frequency range is considered. Assuming azimuthally symmetric excitation, the radiation pattern of the circular array is approximated by the space factor for the equivalent circular aperture and a simple and efficient tool is introduced for analysis of the array radiation pattern. The e...