Bulk and patch ferrite resonator antennas based on the ceramic matrix composite: GdIGx YIG1-x

✍ Scribed by P. B. A. Fechine; A. F. L. Almeida; R. S. de Oliveira; R. S. T. Moretzsohn; R. R. Silva; A. S. B. Sombra

• Book ID: 102522980
• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 391 KB
• Volume: 51
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.24395

✦ Synopsis

In this study, the dielectric properties of the GdIG X YIG 1-X ferrite composite material at radio frequency (RF) and microwave frequency bands were studied. These measurements were carried out in different sample geometries: thick films and cylindrical ceramic bulk ferrite resonator. In the RF range, we observed that the material is rather stable because of its short changes as a function of temperature and frequency range. The temperature capacitance coefficient values for all the samples (thick films and cylindrical ceramic bulk samples) presented short positive values at the RF range. The GdIG 0.5 YIG 0.5 thick film was used as a substrate for the microstrip antenna device, where the upper Ag electrode served as a circular patch antenna and a microstrip line was used as a feed line. The microstrip antenna operates in this configuration at 8.185 GHz. In the study of the dielectric properties of the composites antenna geometry, with the same ferrite composite, a bulk cylindrical geometry was investigated. A numerical study, together with the experimental, was done, and the dielectric characteristics of the composite like r , tg␦ E , and r were obtained.