Kathawut, 59, who presents an online radio show from overseas, was arrested on his return to Thailand in June for defaming the monarchy on his programme, according to his lawyer, who only wished to be identified as a representative of the Thai Lawyers for Human Rights.
Under Thailand's strict lese majeste rules anyone convicted of insulting the king, queen, heir or regent faces up to 15 years in prison on each count.
Rights groups say there has since been a rise in both charges and convictions under the law. Most cases have been handled in civilian courts rather than military ones.
"Initially the military court sentenced him to 10 years in prison but as he confessed the judge halved the sentence to five years," said the lawyer, who did not identify the accused by his surname for fear of reprisals against his family.
An official from Bangkok's Military Court told AFP a lese majeste verdict had been scheduled today but provided no further details.
The royal family is a highly sensitive topic in the politically turbulent kingdom where 86-year-old King Bhumibol Adulyadej, the world's longest reigning monarch, is revered as a demi-god by many Thais.
The lawyer added that her client, who travelled to Thailand to attend the funeral of a relative, had been denied bail.
Rights groups have voiced particular concern over the fate of suspects charged under martial law, imposed by the army two days before the coup, as they have no right to appeal in a military court.
Many of those charged have been linked to the "Red Shirt" movement, whose activists are broadly supportive of fugitive former premier Thaksin Shinawatra.
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