Yagi-Uda Combined Radiating Structures of Centimeter and Millimeter Wave Bands

Abstract

An electrodynamically rigorous mathematical model of a combined vibrator-slot structure consisting of a narrow radiating slot cut in a rectangular waveguide end wall and several thin impedance vibrators placed over the infinite screen is presented. Numerical results concerning internal and external electrodynamic characteristics of the antennas with optimized structural parameters have confirmed the possibility of constructing the Yagi-Uda combined radiating structures in the microwave and extremely high frequency (EHF) bands.

Radiation of Electromagnetic Waves by an Arbitrarily Oriented Slot at the End Wall of a Rectangular Waveguide

“…At the present time, narrow slots cut in rectangular waveguide end walls whose longitudinal axis is parallel to one of the coordinate system axes are widely used in microwave antenna-waveguide technology. The slots can serve as radiators which radiate into a half-space above an infinite screen [1][2][3], as coupling elements between various electrodynamic volumes [4][5][6] and as structural components of combined radiating structures [7]. A control of electrodynamic characteristics of the radiators and coupling slots can be realized, first of all, by varying slot geometric dimensions and positions relative to the waveguide walls under conditions that the coordinate system axes associated with the slot and waveguide are parallel.…”