11.1 Program Listings and Copyright Conditions

The diskette enclosed with the book contains several simple programs that are helpful for the design of dielectric resonator elements to be used in microwave circuits, such as filters or oscillators. The three programs in BASIC language, for which the source code is provided in ASCII format, are:

Program DRESP solves for the resonant frequency of the TE _{01 ?} mode, using the perturbational correction to the Itoh and Rudokas model (see Ch. 4). If requested, the program will plot the z-dependence of the E _? and H _z field components, and print the table of energy distribution for the six basic regions of the dielectric resonator on a microstrip substrate. Program DRESV2 solves for the resonant frequency and the Q factor of the TE _{01 ?} mode, applying the variational correction to the Itoh and Rudokas mode, as described in Ch. 4. The accuracy of the resonant frequency obtained by these two programs is discussed on p. 160. Typically, one can expect an error of less than 1.5 %, and the accuracy improves when the lengths of external regions L ₁ and L ₂ become much smaller than the resonator length L (see Fig. 4.6, p. 133).

Program FOAM was developed after the original publication of this book, so its theory of...