JPS6439804A - Portable antenna - Google Patents

Abstract

PURPOSE:To facilitate the conveyance, and to improve the radiation efficiency, by executing an operation in a state that a bag in the inside of a dielectric sheet has been filled with gas. CONSTITUTION:A microstrip line which has been bent in a shape of a crank is formed by a dielectric sheet 2, gas in the inside, a conductive radio wave radiating element 1 and a ground conductor 3, by filling the inside of a bag with gas from a gas injection port 6 of the dielectric sheet 2, and forming a space between a first face and a second face. When a signal is fed from a feeding part 4, while an electromagnetic wave is propagated to a terminal resistance 5, an electromagnetic wave is radiated from discontinuous parts a-d of a crank part of the conductive radio wave radiating element 1. In this case, since gas exists between the conductive radio wave radiating element 1 and the ground conductor 3, a specific inductive capacity is small. Also, at the time of conveying the titled antenna in a state that it is not used, it is carried by exhausting the gas from the gas injection port 6, bending and folding, or furling and making it small. In such a way, it can easily be carried, and also, the radiation efficiency is improved.