Feed network and antenna

An antenna, comprising a reflector, a feed network and at least one radiating element that is positioned on a first side of the reflector, wherein the feed network comprises an adjustable electromechanical phase shifter that comprises a main printed circuit board and a phase shifting unit, wherein the adjustable electromechanical phase shifter is configured to shift the phase of a radio frequency (“RF”) signal that is input to the feed network and provide the phase shifted RF signal to the at least one radiating element,

• wherein the phase shifting unit is formed on the surface of a first side of the main printed circuit board, wherein the first side of the main printed circuit board is a side that is closer to the at least one radiating element, and
• wherein the main printed circuit board is positioned on the first side of the reflector.