  In this paper, a low-cost, simple and reliable bi-static Radar Cross Section
(RCS) measurement method making use a historic Marconi set-up is presented. It
uses a transmitting (Tx) antenna (located at a constant position, at a
reference angle of {\theta} = 0o) and a receiver (Rx) antenna (mounted on a
moveable arm calibrated in the azimuthal direction with an accuracy of 0.1o). A
time gating method is used to extract the information from the reflection in
the time domain; applying time filter allows removing the antenna side lobe
effects and other ambient noise. In this method, the Rx antenna (on the movable
arm) is used to measure the reflected field in the angular range from 1o to 90o
of reflection from the structure (printed PCB) and from the reference
configuration represented by a ground (GND) plane of the same dimension. The
time gating method is then applied to each pair of PCB / GND measurements to
extract the bi-static RCS pattern of the structure at a given frequency. Here
comparison of measurement results carried out at 18 GHz and 32 GHz with
simulation indicates the successful performance of the proposed method. It can
be used as a low-cost, reliable and available option in future measurement and
scientific research.
