Measurements of complex permittivity with waveguide resonator using perturbation technique
✍ Scribed by M. Hajian; K. T. Mathew; L. P. Ligthart
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 134 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0895-2477
No coin nor oath required. For personal study only.
✦ Synopsis
< 2 . Figure 4 Power transmission coefficient S and reflection 21 Ž< < 2 . coefficient S in T-junction with impedance-matching disks. 11 Ž . < < 2 Ž . < < 2 a S , b S 21 11 increased from the corresponding values of an empty T-junction; thus, the disks act as impedance-matching plates. If the disks are placed outside domain 1, they may increase the reflection coefficient S and decrease the transmission co-11 efficient S , and so make the propagation property of the 21 T-junction worse. It should be mentioned that all of the computations are based on three dimensions, so the present approach can be utilized to analyze many microwave devices with waveguide T-junctions or Y-junctions.
IV. CONCLUSIONS
The propagation characteristics of electromagnetic waves in the H-plane rectangular waveguide tee-junction with discontinuities are analyzed via the finite-difference time-domain algorithm. The fields within the T-junction with discontinuities and S-parameters are obtained by the present approach.
The FDTD results are in good agreement with the experimental data for the transmission coefficient of the T-junction, as well as the numerical results calculated by other methods for the power transmission and reflection coefficient of the T-junction with a sinusoidal wedge. Studies on the effect of the impedance-matching disk in the T-junction on the Sparameters indicate that the location of the disk in the T-junction is an important factor for the propagation property of the T-junction.