Patent ID: 8643556
Filing Date: 2014-02-04
Classification: H01Q

Abstract:
1. An aerial operative to receive circularly polarised satellite radio signals, said aerial comprising: at least one substantially horizontally oriented conductor loop arranged over a conductive base surface and an assembly for electromagnetic excitation of the conductor loop connected to an aerial connection, wherein the conductor loop is configured as a loop emitter by a polygonal or circularly closed loop extending in a substantially horizontal plane of height h above the conductive base surface, the loop emitter forms a resonant structure and is electrically excited by the electromagnetic exciter whereby on the loop the current distribution of a travelling line wave occurs in one direction of rotation, of which the phase difference over one revolution is M*2π, where M is an integer and has at least a value of M=2, to facilitate the vertically oriented fractions of the electromagnetic field, there is at least one emitter extending vertically at the circumference of the loop emitter and to the conductive base surface and which is electromagnetically coupled to both the loop emitter ( the height h is lower than ⅕ of the free-space wavelength λ, wherein over the circumference of length (L) of the loop emitter, several (N) vertical emitters, spaced apart from each other as sections of the structure at approximately equal intervals of the developed length (L/N), are coupled via loop coupling points to the loop emitter on the one hand and on the other hand via earth connection points, and by the design of the vertical emitters both the resonance of the loop emitter designed as a resonant structure and the direction of travel of the line wave on the loop emitter caused by electromagnetic excitation are facilitated, wherein to produce the resonance of the loop emitter, at least one of the vertical emitters is connected at an interruption point to a low-loss reactance circuit having the reactance X necessary therefor, wherein the coupling of the vertical emitter to the earth connection point is capacitive, and the necessary reactance X of the low-loss reactance circuit is provided by the design of this capacitive coupling, and wherein the reactance circuits constructed as capacitances are formed in such a way that the vertical emitters are formed at their lower ends into individually shaped planar capacitance electrodes, and by interposition of a dielectric plate between the latter and the electrically conductive base surface constructed as an electrically conductively coated printed circuit board, the capacitances are designed for coupling three vertical emitters to the electrically conductive base surface, and for capacitive coupling of the fourth vertical emitter to the aerial connection, the latter is designed as a planar counterelectrode isolated from the conductive layer.