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admittance amplitude angle antenna structure antenna system antenna under test aperture approximation array factor axis balun bandwidth beam Bessel function biconical antenna calculated characteristic impedance Chebyshev Chebyshev polynomial circuit coefficients component consider constant coordinate current distribution determined directive gain distance effective electric field element currents employed equation example excited ferrite field produced field strength formula frequency given horn indicated in Fig input impedance integral length linear array load lobes log-periodic dipole loop magnetic current maximum Maxwell's equations measurement monopole monopole antenna noise obtained output parallel-wire line phase shift polarization polynomial power delivered problem quantity radiation efficiency radiation pattern radiation resistance ratio reactance receiving antenna reflector region relative result side-lobe level signal slot antenna solution spacing spherical surface temperature terminals Trans transmission line transmission-line uniform values variable vector potential visible range voltage wave waveguide wavelength wire zero