An investigation of multiband Fabry-Pérot resonant cavity antennas

A Fabry-Pérot resonant cavity antenna is a type of two-dimensional (2D) leaky-wave antenna that uses a radially-propagating leaky wave on a guiding structure as the main radiating mechanism to form the beam. Either pencil beams at broadside or conical beams may be produced, with broadside beams being the most common. The structure consists of a partially reflecting surface (PRS) over a ground plane, with a possible substrate between. The PRS is often in the form of a periodic frequency selective surface (FSS), such as a 2D periodic array of metal patches or slots in a conducting plane. Although introduced by von Trentini in 1956 (G. von Trentini, “Partially Reflecting Sheet Arrays,” IEEE Trans. Antennas Propagat., vol. 4, pp. 666-671, Oct. 1956), the structure continues to be studied and improved.