Phased array antenna

A phased array antenna comprising:

• a base layer comprising a substrate with a plurality of protruding posts, said posts for stopping wave propagation along said base layer;
• a printed circuit board (PCB) arranged on said base layer, and comprising at least one phased array radio frequency (RF) integrated circuit (IC) on a first side of the PCB facing the base layer and the protruding posts, the PCB further comprising feeds for transferring of RF signals from the phased array RF IC(s) to an opposite second side of the PCB;
• a radiating layer, comprising a plurality of radiating elements for transmitting and/or receiving RF signals from the phased array antenna;
• and
• a feeding layer for transfer of RF signals, arranged between the feeds of the PCB on the second side and the radiating elements of the radiating layer,
• wherein the antenna further comprises a filter layer arranged between the PCB and the feed layer.

A phased array antenna comprising:

• a base layer comprising a substrate with a plurality of protruding posts, said posts for stopping wave propagation along said base layer;
• a printed circuit board (PCB) arranged on said base layer, and comprising at least one phased array radio frequency (RF) integrated circuit (IC) on a first side of the PCB facing the base layer and the protruding posts, the PCB further comprising feeds for transferring of RF signals from the phased array RF IC(s) to an opposite second side of the PCB;
• a radiating layer, comprising a plurality of radiating elements for transmitting and/or receiving RF signals from the phased array antenna;
• and
• a feeding layer for transfer of RF signals, arranged between the feeds of the PCB on the second side and the radiating elements of the radiating layer,
• wherein the protruding posts of the base layer have maximum cross-sectional dimensions of less than half a wavelength in air at the operating frequency, and/or wherein the protruding posts are spaced apart by a spacing being smaller than half a wavelength in air at the operating frequency.