A radio relay antenna for application at 18 GHz

An antenna, designed for mast or roof-top mounting and incorporating esthetic considerations, has been tested for use in the 17.7-to 19.7-GHz frequency range. A gain efficiency of 60% and highly directive symmetrical radiation patterns have been obtained. Elevation beam aiming of plus or minus 4 degrees from horizontal is achieved by tilting an internal plane reflector. The antenna canister is also designed to provide space for electronic modules.