SLOT EXCITATION OF THE DIELECTRIC DISK RADIATOR

Dielectric disk radiators which are excited by a narrow slot in the gr ound plane of a microstrip line are investigated. The resonance freque ncies of the dielectric disk for the HEM11 mode are computed numerical ly in the complex frequency plane. From the later results, the actual resonance frequency and the Q-factor are obtained. The dielectric disk is made of a high dielectric constant ceramic material with epsilon(r )=22. The radiation patterns and reflection coefficients are measured and presented for several slot lengths and dielectric disk dimensions. The radiation patterns are also computed assuming a magnetic agreemen t is obtained between the computed and measured results. The results p resented here also demonstrate the viability of this type of antenna, which has high dielectric constant, as an efficient radiator provided the proper mode is excited.