MULTI METER WAVE ZONE ANTENNA DEVICE

PROBLEM TO BE SOLVED: To maintain power density of the opposite station whose elevation is constant in an almost uniform way regardless of distance by arranging plural primary radiators vertically and combining them with a secondary curved surface mirror. SOLUTION: It is possible to compensate loss due to distance and loss owing to atmospheric attenuation and make the receiving power density of the communication partner station almost constant by setting the vertical-plane directivity characteristic G(θ) of an antenna to be G(θ)=K2×cosec2θ+K×H×cosecθwhere the angle of depression of the antenna is θ, the altitude difference with the partner communication station is H and a proportional coefficient due to distance R is K. K×Hcosecθis the loss due to atmospheric attenuation. Accordingly, loss due to distance and atmospheric attenuation is compensated and if the altitude of the partner station is constant, the reception level at the partner station can be kept almost constant by appropriately setting the exciting power of primary radiators 10a to 10c which are vertically arranged to perform simultaneously exciting, and making radiated primary pattern radio waves a secondary pattern with phases made uniform through a quadratic curved surface mirror 11 and radiating it in a desired direction.