Achievement of pencil-beam radiation from a TM_(01) mode circular waveguide source using multi-sector dielectric lens
A method of improving radiation from TM_(01) model conical horn is presented.Drielectric lens consisted of a number of sectors locates on aperture plane of conical horn, and thickness of each sector is choosed appropriately,then the conical horn can radiate circular polarization pattern with a boresight peak. Radiation fields of the horn are given by analytic formulae and the analytic results agree well with that of numerical simulations,the peak pattern gain of the horn with multi-sector dielectric lens is about 19.6 dB,bandwidth is approximately 15.8%(reflect coefficient S_(11)0.2),and aperture efficiency is 31.8% at 5 GHz.