The near zone field of thin impedance vibrators over perfect conducting plane

The analytical expressions for a full radiated electromagnetic field of a horizontal impedance vibrator situated over perfect conducting plane have been obtained. The calculations have been done and the plots of spatial distribution of the near zone field of a vibrator dependent on its surface impedance and on the distance to conducting plane are represented

The point objective function for optimization of side lobes of linear antenna arrays

A new form of objective function is suggested for the problems of point optimization of complex radiation patterns of discrete antenna arrays. The function takes the properties of individual antenna radiators and the antenna array phase characteristic into account. Several examples of various antenna arrays help consider some properties of the point objective function and peculiarities of application of optimization of side lobes’ level using this function

The near zone field of crossed impedance vibrators in absorbing medium over the perfect conducting plane

The investigations of distribution of the near zone electromagnetic fields of the thin crossed impedance vibrators situated in absorbing medium over the infinite perfect conducting plane have been made. The possibility of creation of the radiation field of circular (elliptic) polarization at the expense of a definite value and a type of surface impedance of each of vibrators is shown

Array of the two arc monopoles on a sphere with surface impedance

The antenna array of two arc monopoles which are located parallel to the surface of a perfectly conducting or impedance sphere is considered. The influences of the phase of excitation of a monopole, the distance to the sphere surface, and sphere radius and its surface impedance on the directivity of the radiator are considered. It is shown that the radiation pattern of the antenna for antiphase excitation is highly directional and has a single maximum in the plane of arrangement of the emitters

Thin vibrators with arbitrary excitation and surface impedance

The approximate analytical solution of the integral equation concerning the current in a thin straight vibrator with variable complex surface impedance has been obtained. The vibrator is located in unlimited space and is excited by the arbitrary field of impressed sources. For the case of vibrator’s excitation in the distinct from the centre point along its length the calculations have been carried out and the plots of electrodynamic characteristics of the vibrator, depending on the magnitude and the type of its surface impedance and location of the point of excitation, are presented

Radiation polarization control of the turnstile antenna with impedance vibrators

The problem concerning the creation of the radiation field with circular polarization in the certain direction by turnstile antenna, consisting of the impedance vibrators, excited cophasedly, has been solved on the basis of the solution of the problem about radiation of the thin impedance vibrator over the perfectly conducting plane. The length and the value of the surface impedance of one vibrator are fixed at this, and the problem conditions are satisfied by fitting the length and the surface impedance of the other vibrator. The special case, when a perfectly conducting vibrator is used as a tuning radiator, has been considered. The angular distributions of the coefficient of ellipticity, illustrating the results of calculations, are given

The multi-band reflector antenna of the double-polarization scanning radio aerospace radiometer

The paper describes a 13-channel reflector antenna operating in six subbands of wavelengths from 3 mm to 4.5 cm in two orthogonal linear polarizations for the scanning aerospace radiometer