Rotman lens for mm-wavelengths

Abstract

The 77 GHz band has been reserved for intelligent cruise control in luxury cars and some public transport services in America and the United Kingdom. The Rotman lens offers a cheap and compact means to extend the single beam systems generally used, to fully functional beam staring arrangements.Rotman lenses have been built for microwave frequencies with limited success. The flexibility of microstrip transmission lines and the advent of fast accurate simulation packages allow practical Rotman lenses to be designed at mm-wavelengths. This paper discusses the limitations of the conventional design approach and predicts the performance of a new Rotman lens designed at 77 GHz.

Rotman-lens as a true-time-delay beamformer at low UHF frequencies

“…4). The gain patterns show the stationary beams for BP 1 and BP 5 . These gain patterns were synthesized by using measurement results.…”

“…These are based on ray-optical modeling of the parallel plate waveguide with feeding points on the arrayport and beamport contour [4]. There also exist some design rules for the optimum port layout, when using microstrip technology [5]. A numerical field solver is used to calculate the Rotman-Lens structure.…”

“…The Fig. 2 shows the surface currents for excitation of BP 1 and BP 5 . For BP 1 a non-uniform distribution along the arrayport side is observable.…”

Analysis of Rotman Lens Antenna for Different Substrates for Circular Contour

“…Array Factor: Array factor is an important factor for the analysis of Rotman Lens performance. Array factor analysis indicates the behaviour of side lobe levels and the scanning directions [19]. The side lobe level of a circular contour is -14db in case of RT Duroid for all the frequencies under consideration.…”

Design of shaped dielectric lens antenna for wide angle beam steering

“…Overseas, these devices have been developed by the NHTSA (National Highway Traffic Safety Administration) [6]. Antennas such as Rotman lens [7] have been developed.…”