Decoupling of Multifrequency Dipole Antenna Arrays for Microwave Imaging Applications

Abstract EN

The mutual coupling between elements of a multifrequency dipole antenna array is experimentally investigated by S-parameter measurements and planar near-field scanning of the radiated field.

A multifrequency array with six dipoles is analyzed.

In order to reduce the coupling between dipoles, a planar metasurface is placed atop the array acting as superstrate.

The mutual coupling of the antenna elements in the absence and presence of the superstrate is presented comparatively.

Between 3 and 20 dB mutual coupling reduction is achieved when the superstrate is used.

By scanning the field radiated by the antennas and far-field measurements of the radiation pattern, it is observed that the superstrate confines the radiated power, increases the boresight radiation, and reduces the endfire radiation.