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− This paper examines an extension of the Ewald method for evaluating the periodic free-space Green's function due to an array of point sources, when the wavenumber of the phased sources is allowed to be complex. This makes the Ewald method useful for treating leaky modes on periodic structures.

There are occasions where it is required to image moving or stationary targets through visually opaque obstacles such as walls. This imaging is achieved through sophisticated electromagnetic and signal processing techniques usually using microwave frequencies for better image resolution and improved wall penetration. Through-the-Wall Microwave Imaging (TWMI) can be used in numerous applications including rescue missions, behind-the-wall target detection, surveillance and reconnaissance, and even sensing through smoke and dust, to name a few. This contribution investigates the use of a broadband microstrip patch array (in a multi-element multi-output (MEMO) implementation) as a candidate antenna for TWMI receive array application.