Energy Characteristics of a Slot Cut in an Impedance End-Wall of a Rectangular Waveguide and Radiating Into the Space Over a Perfectly Conducting Sphere

Abstract

Abstract-A mathematical model of a spherical antenna excited by a slot cut in an impedance end-wall of a semi-infinite rectangular waveguide was built using a rigorous solution of the problem. Control of energy characteristics is accomplished by changing impedance distributed on the end-wall of the waveguide section. If the waveguide is excited by the wave H 10 , the wavelength tuning reaches (30-35)%, i.e., about a half of the wavelength range of single mode waveguide regime.

Radiation fields of the spherical slot antenna in a material medium

“…An asymptotic solution of the integral equation for a magnetic current in the slot aperture was found by a generalized method of induced magnetomotive forces (MMF) [6,7]. The magnetic current in the slot aperture may be written as if the fields are defined outside the sphere and inside the waveguide section, respectively.…”

Slotted Spherical Antenna With a Multi-Element Diaphragm in the Waveguide

“…The characteristics of spherical antennas with resonant rectangular slot radiator were studied in [6][7][8][9][10][11][12]. The external electrodynamic characteristics of slot antennas were considered in [6][7][8] under the assumption that the magnetic currents along the narrow half-wave slot radiator are defined by using a predefined cosine distribution.…”

“…In the monograph [13], the authors of this article have proposed a numerical-analytical method known as the generalized method of induced MMF for solving the diffraction problems concerning slotted coupling elements between electrodynamic volumes. This method was applied for solving the problem of electromagnetic wave radiations by waveguide-slot structures into the external space above a perfectly conducting sphere [9][10][11][12]. The problem of electromagnetic wave radiation into space outside the perfectly conducting sphere through the slot cut in the end wall of the semi-infinite rectangular waveguide, known as the waveguide-slot spherical antenna (WSSA), was presented in a strict electrodynamic formulation in [9].…”