Abstract
The ring-slot-element cell for reflectarray antennas is investigated. The mathematical model of the unit cell is based on the integral equation that is solved by the moment method with the use of the spectral domain Green’s function. Coaxial-line higher modes expressed in terms of cylindrical functions are used as the basis for magnet-current representation. It is shown that “stricken” frequencies at which resonance modes occur are an inherent part of slot elements. These frequencies are determined by the Green’s function poles. Moreover, the lowest resonance mode may occur in the operating band under certain conditions. Reflection-phase dependencies on the ring-slot size are provided, demonstrating that at “stricken” frequencies the unit cell does not operate properly. Field plots are presented, which show that the resonance-mode field distribution on the ring slot is significantly different from the normal-mode field distribution. It is found that the “stricken” frequencies might be shifted beyond the operating band by means of thorough selection of unit-cell geometric parameters.
Highlights
The ring-slot-element cell for reflectarray antennas is investigated
The mathematical model of the unit cell is based on the integral equation
that is solved by the moment method with the use
Summary
The ring-slot-element cell for reflectarray antennas is investigated. The mathematical model of the unit cell is based on the integral equation that is solved by the moment method with the use of the spectral domain Green’s function. В одном случае элементы расположены в узлах прямоугольной сетки Компоненты векторов напряженности электрического и магнитного полей в приближении локальной периодичности (ячейки Флоке) выражаются через фурье-образ тензорной функции Грина следующим образом: Грина; G EM и G HM – компоненты тензора фурье-образа функции Грина; kxp и kypq – дискретные поперечные волновые числа; x и y –
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