Transient response of an infinite cylindrical antenna

an infinite planar array of rectangular microstrip patch antenna analysis

the methods which are used to analyze microstrip antennas, are divited into three categories: empirical methods, semi-empirical methods and full-wave analysis. empirical and semi-empirical methods are generally based on some fundamental simplifying assumptions about quality of surface current distribution and substrate thickness. thses simplificatioms cause low accuracy in field evaluation. ful...

Admittance Dependence of the Infinite Cylindrical Antenna Upon Exciting Gap Thickness

The admittance of an infinite cylindrical antenna is calculated as a function of exciting frequency and exciting gap thickness. The results obtained show that an asymptotic analytical expression derived for the susceptance by Chen and Keller and also later by Fante, is strictly valid only in the limit of "Vanishing gap thickness. An altenate analYtical. form is presented-for die susceptance, wh...

Water-wave propagation through an infinite array of cylindrical structures

An investigation is made into water-wave propagation through a doubly-periodic array of vertical cylinders extending to infinity in both horizontal directions. Methods are presented for the calculation of the frequency ranges for which wave propagation without change of amplitude is possible (‘passing bands’), and for which propagation without change of amplitude is not possible (‘stopping band...

The Cylindrical Antenna with Gap

Narrowbeam cylindrical antenna array with sparse antenna spacing

In this paper we suggest a cylindrical array, which utilizes signal cancellation and sparse element spacing. The array has narrow beamwidth and low sidelobe level. The beamwidth is about 12° for a 35 element array having -20 dB sidelobe level. Omnidirectional coverage area is obtained by a combination of commutation and phasing. The array has less elements and smaller size than a respective arr...