Single-feed dual-frequency dual-polarized slotted square microstrip antenna

✍ Scribed by G. S. Binoy; C. K. Aanandan; P. Mohanan; K. Vasudevan; K. G. Nair

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 156 KB
• Volume: 25
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(20000620)25:6<395::aid-mop10>3.0.co;2-6

✦ Synopsis

region W. The effect of the dimensions W and H is practis w Ž .x cally negligible Fig. 3 c . A variation of the dimension W with respect to its nominal value, according to whether an increase or decrease can be advantageous or disadvantageous, since it must be remembered that a phase velocity in practice is constant over the full frequency band, is desirable. A similar behavior is obtained for the interaction impedance K, even if, in this case, it is sensitive to the variation of all of the three dimensions of the T-shaped rod.

From the point of view of TWT operation, the effect on the phase velocity is interesting since only one dimension affects this quantity.

CONCLUSION

A study on the effect of the mechanical tolerance of a T-shaped rod on the normalized phase velocity and interaction impedance of a helix slow-wave structure in a TWT has been presented. A slow-wave structure was realized, and a comparison with experimental data has been presented. It has been shown that only one dimension significantly affects the flatness of the normalized phase velocity, a quantity particularly critical for the electrical performance of the helix slow-wave structure.