Aperture-coupled cylindrical dielectric resonator antenna

✍ Scribed by George Drossos; Zhipeng Wu; Lionel E. Davis

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 360 KB
• Volume: 20
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(19990320)20:6<407::aid-mop14>3.0.co;2-7

✦ Synopsis

Ž .

impedance profile and WrH ratio are plotted in Figure Ž . and c , respectively.

The approximate Q-function used in the examples above reduces the convergence speed, and the results considerably depend on the device length. However, the present method enhances the degree of freedom in designing nonuniform transmission lines.

IV. CONCLUSION

We have derived an approximate spectral function from a linearized Riccati equation, and have described the Fourier transform method in which an iterative correction process is incorporated. Numerical results have shown that calculated spectra approach with slow convergence speed a target spectrum as the iteration continues. We expect that the phase function provides an additional degree of freedom designing tapers, and thus the phase function is useful for the synthesis of tapered lines. The computation speed and accuracy can be enhanced by deriving an improved Q-function from a nonlinear Riccati differential equation. The present method is general, and can be applied to design microwave filters and optical filters as well as impedance-matching circuits.