Patent ID: 7453410

Claim:
An antenna comprising: a first waveguide in direct communication with a base waveguide at a first position, the base waveguide forming a continuous loop; a second waveguide in direct communication with the base waveguide at a second position, the second position being spaced apart from the first position by about one-sixth the circumference of the loop; and a third waveguide in direct communication with the base waveguide at a third position opposite the first position from the second position, the third position being spaced apart from the first position by about one-sixth the circumference of the loop such that the third position is uninterruptedly spaced apart from the second position, without extending through the first position, by about two-thirds the circumference of the loop, wherein the first, second and third waveguides comprise closed-channel waveguides, and wherein the second and third waveguides have an open end and are configured to at least one of radiate electromagnetic waves or focus radiating electromagnetic waves.