Flat Array Antennas for Ku-Band Mobile Satellite Terminals

Abstract EN

This work presents the advances in the development of two innovative flat array antennas for Ku-band mobile satellite terminals.

The first antenna is specifically conceived for double-deck trains to allow a bi-directional high data rate satellite link.

The available circular surface (diameter 80 cm) integrates both a transmitting and a receiving section, operating in orthogonal linear polarizations.

The TX frequency range is fully covered while the RX bandwidth is around 1 GHz arbitrarily allocated on the DVB range depending on requirements.

The beam is steered in elevation through a phased array architecture not employing costly phase shifters, while the steering in azimuth is mechanical.

Active BFNs allow excellent performance in terms of EIRP and G/T, maintaining extremely low profile.

High antenna efficiency and low fabrication cost are ensured by the employment of innovative SIW (Substrate Integrated Waveguide) structures.

The second antenna, receiving-only, is designed for radio/video streaming services in mobile environment.

Full DVB coverage is achieved thanks to cavity-backed patches operating in double linear polarization.

Two independent broadband active BFNs allow simultaneous reception of both polarizations with full tracking capabilities and a squintless beam steering from 20∘ to 60∘ in elevation.

A minimum gain of 20 dBi and G/T >−3 dB/K∘ are achieved, while maintaining extremely compact size and flat profile.

In the design of both antennas fabrication cost is considered as a driving factor, yet providing high performance with a flat profile and thus resulting in a great commercial potentiality.