Millimeter-Wave Offset Fresnel Zone Plate Lenses Characterization

Abstract

Abstract-Fresnel Zone Plate Lenses (FZPLs) are transparent-opaque lenses that filter the desirable phase. The centred Fresnel lenses have a strong back radiation towards the feed. In order to solve this drawback, offset feeding or offset pointing lenses are used. In this work, both offset FZPLs are studied using an optical physics method and experimentally characterized in the millimeter band. Two prototypes have been manufactured and measured, presenting a narrow beamwidth. The characteristics of pointing of this beam are studied depending on the feed gain. This work shows the pointing characteristics of the lenses, simply moving the lens in a plane.

Development of a millimeter-wave transparent antenna inside a headlamp for automotive radar application

“…Fresnel zone plate antenna composed of RF concentric opaque and transparent zones [8][9][10][11]. In a typical implementation using a PCB substrate, the opaque zones are the concentric circles that are printed on the front PCB surface.…”

“…The ellipses are calculated through equations [8, 9]:where A n and B n are the semi-axis of the ellipses in the X L and Y L -axes of the local coordinates on the reflector surface (not shown in Fig. 2), C n is the position of the nth ellipses center along the local X L -axis, θ 0 is the angle between the propagation direction and the normal of the reflector surface, F is the focal distance, and λ is the free-space wavelength.…”

The Radiation Focusing by the Array of Waveguide based Elements with Controllable Reflection

“…The waves from two neighboring Fresnel zones are counter-phased. The electronic scanning can be performed in a certain angle sector with the change in geometrical arrangement of zone rings [3][4]. In this case, the only transceiver at fixed position can be used.…”