The theoretical properties of higher mode cylindrical dielectric resonators for millimetre wave monolithic circuits

This work extends our previous studies of square cuboid dielectric resonators to the cylindrical pill types. The microstrip substrates considered are gallium arsenide and a polyimide, and calculations have been undertaken for all the resonant modes. Particular attention is given to the much used high Q TE016 mode, and the higher Q HE126 and TE01(1+δ) modes that we have used in several applications. The frequencies of the other TE, TM, EH and HE modes have been calculated to determine the resonator aspect ratio that minimises mode interference. Data presented include the effect of resonator permittivity, substrate thickness and permittivity, and the effect of circuit package. Experimental data are discussed briefly.