ttemely sharp peaks at the lateral spectral frequencies that coincide with the real parts of the surface-wave poles. There fore a more sophisticated method should be utilized for accurate integration, such as a 20-point Gaussian quadrature. Besides, the original finite integration limits effectively may be replaced by k_,/ku = -20.0 and +20.0 without causing noticeable errors since a significant variation concentrates between the two points. Similarly, remarkable peaks exist in the low spectral range for the off-diagonal spectral matrix elements, and a major amplitude variation resides between It,/Ito = --40.0 and +400. which are recommended to re place the original infinite limits as well. REFERENCES l. N.K. Das and D.M. Pozer. Full-wave spectral-domain computa tion ol material, radiation and guided wave losses in infinite niultilayered printed transmission lines, IEEE Trans Microwave Theory Tech 39 (i991). $4-63. 7. H. Shigesawa. M. Tsuji, and AA. Oliner. Dominant mode power leakage from printed-circuit waveguides, Radio Sci 26 (1991), 559-564.
Microwaves play a vital role in the diagnosis and treatment of diseases caused by the abnormal mineralization of biological fluids in human body. First hand information regarding the dielectric behavior of these minerals facilitates to detect these crystals. This paper attempts a comparative study of the dielectric properties of urinary crystals grown in vitro by gel technique with natural stones procured from patients who had undergone stone removal surgery. Cavity perturbation technique was employed and measurements were made in the S band.
ABSTRACT:The open-short-load (OSL) method is very simple and widely used for one-port test fixture calibration. In this paper, this method is extended, for the first time, to the two-port calibration of test fixtures with different test ports. The problem of phase uncertainty arising in this application has been solved. The comparison between our results and those obtained with the SOLT method shows that the method established is accurate for practical applications.
Polyaniline was synthesized by using ammonium persulfate initiator in the presence of 1M HCl. It was dried under different drying conditions like room temperature drying (for 48 h), oven drying (at 50 -60°C for 8 h under a vacuum), and vacuum drying (at room temperature for 16 h). The conductivities of these samples were measured at microwave frequencies. These samples were also pelletized and the measurements were repeated. The cavity perturbation technique was used for the study.
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