Implementation of conductor losses in an FDTD algorithm combined with Floquet boundary conditions: Application to the study of millimeter-wave resonant cavities
✍ Scribed by R. Sauleau; D. Thouroude; Ph. Coquet; J. P. Daniel; T. Matsui
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 167 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
Figure 2 a -f . The measurements were made with the feed positions indicated.
Discussion
The surprising result in Table 1 is the relatively wide bandwidth of the shorted patch. For h s 7 mm, which corresponds to about 0.058 at the center frequency, the impedance 0 bandwidth is 18.54%. For comparison, for a half-wave regular patch of the same thickness and the same width but double in length, the measured impedance bandwidth, as shown in Table 1, was found to be only 5.55%.
The significant feature in the measured patterns is the large cross-polarization level in the H-plane. At oblique angles, the cross-polarization level is close to the copolarization level in all of the six cases measured.
CONCLUDING REMARKS
We have presented measured results on bandwidth and patterns of a quarter-wave shorted patch on foam substrate, showing that this type of patch has considerably larger impedance bandwidth than the half-wave regular patch. However, it also has large cross polariztaion in the H-plane. Measurements are currently being carried out for microwave substrates, and the results will be repeated in the future.