Title :
Optimal horn antenna design to excite high-order Gaussian beam modes from TE0m smooth circular waveguide modes
Author :
Bocio, Carlos del Río ; Gonzalo, Ramón ; Ayza, Mario Sorolla ; Thumm, Manfred
Author_Institution :
Microwave & Millimeter Wave Group, Univ. Publica de Navarra, Pamplona, Spain
fDate :
9/1/1999 12:00:00 AM
Abstract :
The availability of medium-power gyrotron tubes (10-30 kW, CW) at millimeter-wave frequencies (30-100 GHz) allows applications such as advanced ceramic sintering, surface coating, radar, remote sensing, deep-space communications, etc. The concept of high-order Gaussian beam modes, which, under some conditions, can be assumed to be free-space modes, is applied to transport efficiently the power generated by a gyrotron for technological applications. A family of optimized nonlinear horn antennas is investigated in order to get the maximum coupling between the guided output mode of the gyrotron and the Gaussian beam modes. The numerical simulations show very favorable coupling with a conversion efficiency of about 99.8%
Keywords :
antenna radiation patterns; circular waveguides; gyrotrons; horn antennas; millimetre wave antennas; millimetre wave propagation; optimisation; waveguide theory; 10 to 30 kW; 30 to 100 GHz; CW; TE0m smooth circular waveguide modes; advanced ceramic sintering; conversion efficiency; deep-space communications; far field radiation pattern; free-space modes; guided output mode; gyrotron; high-order Gaussian beam modes; maximum coupling; medium-power gyrotron tubes; millimeter-wave frequencies; nonlinear horn antennas; numerical simulations; optimal horn antenna design; radar; remote sensing; surface coating; Ceramics; Coatings; Frequency; Gyrotrons; Horn antennas; Millimeter wave radar; Millimeter wave technology; Radar antennas; Radar applications; Radar remote sensing;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
