Radio frequency signals detection systems

A radio frequency signals detection system, comprising:

• an array in intimate adjacent contact with a substrate foundation, said array having a plurality of radio frequency (RF) witness films overlain on said substrate foundation;
• wherein each RF witness film in said plurality of RF witness films is a unit cell defined in a three-dimensional coordinate frame of reference defined by an x-axis, a y-axis, and a z-axis, said unit cell centered at an origin of said three-dimensional coordinate frame of reference, said unit cell, comprising:
• a first conductive layer in intimate adjacent contact with said substrate foundation;
• a dielectric layer having a first portion and a second portion, said first portion in intimate adjacent contact with said substrate foundation, said second portion in intimate adjacent contact with said first conductive layer;
• and
• a second conductive layer having a first side and a second side, said first side of said second conductive layer in intimate adjacent contact with said first portion of said dielectric layer;
• wherein said first portion transitions to said second portion at a transition zone, wherein said dielectric layer having a sigmoidal shape at said transition zone;
• wherein said second conductive layer having at least two microstrip extensions perpendicular to each other in the x-y plane;
• wherein each RF witness film in said plurality of RF witness films is equally-spaced from adjacent RF witness films;
• wherein each RF witness film in said plurality of RF witness films is electrically-connected to a direct current (DC) offset voltage;
• and
• a horn antenna configured to radiate RF signals at said array.