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1. (WO2018042347) ANTENNA FOR UNDERWATER RADIO COMMUNICATIONS

Pub. No.:    WO/2018/042347    International Application No.:    PCT/IB2017/055217
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Thu Aug 31 01:59:59 CEST 2017
IPC: H01Q 1/04
H01Q 3/22
H01Q 7/00
H01Q 9/20
Applicants: INESC TEC - INSTITUTO DE ENGENHARIA DE SISTEMAS E COMPUTADORES, TECNOLOGIA E CIÊNCIA
Inventors: DE SOUSA PESSOA, Luis Manuel
INÁCIO, Sofia Isabel
SILVEIRA PEREIRA, Mário Rui
ABODERIN, Oluyomi
CASTRO MANUEL FARIA SALGADO, Henrique
Title: ANTENNA FOR UNDERWATER RADIO COMMUNICATIONS
Abstract:
Method of operating under water an antenna device comprising a frequency-tunable circuit, comprising: tuning said circuit between a first frequency and a second frequency for obtaining a variable directional radiation pattern by the antenna device, to select a directional radiation pattern of the antenna device for improving the radio signal coupling between the antenna devices, in particular for maximizing the radio signal coupling between the two antenna devices, wherein said first frequency and a second frequency are predetermined according to the saltwater-freshwater content of the water such that the directional radiation pattern of the antenna device for one of the two frequencies is directional and the directional pattern of the antenna device for the other of the two frequencies is omnidirectional. Antenna device arranged to periodically tune said circuit to select a directional radiation pattern of the antenna device for improving the radio signal coupling with another antenna device, in particular for maximizing the radio signal coupling with another antenna device.