An ultra-wideband Rotman lens using modified dummy sidewalls

Abstract

A wideband design model for 4×4 microstrip Rotman lens is presented, with a precise behavior of return loss of the ports and their phase centers. The procedure for choosing the optimum geometrical parameters of lens and modifying the curvature of sidewalls yield a very wideband lens. Based on the presented model, a prototype has been built for the true time delay phasing of an antenna array for the frequency range from 8 GHz to 26 GHz. The fabricated 4 × 4 Rotman lens has an average amplitude error of 0.5 dB and phase errors of 2 degree. All the beams have a fixed position in frequency band and the maximum deviation of the beams from the ideal position is less than 0.65 degree.

Optimisation and implementation for a non‐focal Rotman lens design

“…Full‐wave simulation of Rotman lens can predict its performance with a good approximation [21–23]. Fig.…”

Electronic UWB tunable true-time delay line for timed array antennas

“…In communication systems, a true-time delay line (TTDL) has wide applications, such as wideband beamforming, delay-locked loops and equalizers [1,2,3]. For timed array receivers, the TTDL not only mitigates the beam squinting, but also provides a constant delay response to enhance signal-to-noise ratio (SNR).…”