An experimental investigation of the circular disc antenna



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The impedance of a circular disc printed circuit antenna and that of a full scale model using polystyrofoam as the dielectric were measured as a function of the dielectric thickness, the operating frequency and the feed point location. The impedance of both the model and the actual printed circuit antenna was then compared with existing data from previous experimental investigations. The electric field inside the cavity formed by the circular radiator and the ground plane of the model was measured varying the same parameters as before. These measurements were then compared with a previous theoretical analysis for the case of the antenna fed at the edge of the disc. Field measurements were also taken for other feed positions for which present theory does not apply.