Modelling of Lens Array Front Ends for D-Band Communications
C. Ricci Spadoni (TU Delft - Electrical Engineering, Mathematics and Computer Science)
N. Llombart Juan – Mentor (TU Delft - Electrical Engineering, Mathematics and Computer Science)
M. Alonso Del Pino – Mentor (TU Delft - Electrical Engineering, Mathematics and Computer Science)
M. Spirito – Graduation committee member (TU Delft - Electrical Engineering, Mathematics and Computer Science)
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Abstract
This work investigates D-band lens antenna architectures for high-throughput fixed wireless links and assesses their performance while accounting for the main RF front-end and scanning limitations.
Different lens antenna architectures are compared in terms of coverage, directivity, system size and throughput. Based on this comparison, a scanning lens phased array is selected for the front end analysis, since it provides the highest throughput over distance while keeping the system radius limited.
The study is then extended beyond the ideal link-budget analysis by considering the transmitted waveform. The D-band mixer is modeled in ADS, while MATLAB is used for waveform generation, propagation and receiver processing. The evaluation includes mixer nonlinearity, beam squint, phase quantization, random phase errors and inter-beam interference.
Performance is influenced by both the RF front end architecture and its operating point. The different implementations therefore result in different compromises between transmitted power, linearity and supported modulation order. At 100 m, 128-QAM can be supported, corresponding to 87.5 Gbit/s per link, while the maximum link distance is 1.9 km with BPSK.
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