Meandered slotted waveguide for a leaky wave antenna, and a leaky wave antenna

A meandered slotted waveguide, for a leaky wave antenna, the meandered slotted waveguide comprising:

• a male member;
• and
• a corresponding female member arranged to receive the male member therein;
• wherein the meandered slotted waveguide is arrangeable in a first configuration and a second configuration;
• wherein the male member is received in the female member spaced apart therefrom in the first configuration and the second configuration;
• wherein the first configuration defines a first effective delay line having a first meander line length;
• wherein the second configuration defines a second effective delay line having a second meander line length;
• wherein the first effective delay line is different from the second effective delay line and the first meander line length is different from the second meander line length;
• wherein the male member is a planar male member and the female member is a planar female member;
• wherein the meandered slotted waveguide comprises a plurality N of such male members and a plurality M of such corresponding female members configured to receive the plurality N of male members therein, respectively;
• wherein the meandered slotted waveguide is arranged to move from the first configuration to the second configuration by simultaneous translation of the plurality N of male members relative to the plurality M of female members.