I was very ready to stand corrected then read section of the article you linked. Yes, Dyson does mention a ring, but according to your link, only to say that it would be mechanically impossible, going on to say that his vision was of a swarm of objects orbiting a star. So a Dyson Ring is a swarm of objects rather than the single megastructure envisaged by Larry Niven. Dyson was Leonardo Da Vinci to Niven's Igor Sikorsky. (Except no one will ever know if a Ringworld concept could come to fruition because humanity will, in all likelihood, fizzle out when the sun goes nova; the people and corporations who hold the majority of the Earth's currency simply will not see the profit in serious, dedicated space exploration until it is far too late.)
That said, described within the confines of the novel Ringworld is a Niven Ring with an inner Dyson Ring (orbiting between the Niven Ring and the sun, providing a diurnal cycle to the Ringworld.)