A new class of nondiffracting pulses based on focusing leaky waves

In this work, we propose an azimuthally-invariant periodic leaky-wave radiator for the generation of Bessel beams and X-waves by means of backward cylindrical leaky waves at millimeter wavelengths. A rigorous framework is first outlined to understand the theoretical constraints of such novel design. A specific attention is devoted to the impact of the attenuation constant on the focusing properties of the device. On this basis, a practical design is then proposed to meet the previous requirements. Numerical results confirm the interesting capabilities of the considered structure, paving the way for the first generation of focusing leaky waves.