| Autor: |
B. Peyton, F. Arams, B. Kaplan |
| Rok vydání: |
1961 |
| Předmět: |
|
| Zdroj: |
IEEE Transactions on Microwave Theory and Techniques. 9:212-216 |
| ISSN: |
0018-9480 |
| DOI: |
10.1109/tmtt.1961.1125309 |
| Popis: |
Test data are presented on two aluminum-substituted yttrium-iron-garnet (YIG) materials that have low-saturation magnetizations that permit the extension of ferrite devices well into the UHF/VHF region. In particular, one composition has a saturation magnetization of 300 gauss and a line width of 50 oersteds. Measurements are presented that compare the new materials with previously available higher-saturation magnetization materials. A broad-band UHF/L-band four-port circulator that operates over a 2-to-1 frequency band has been developed, using this 300 gauss material. Insertion loss is 1 db or less from 665 to 1320 Mc (with constant magnetic field) and 0.5 db or less from 800 to 1150 Mc. A compact and favorable circulator package design was obtained by using coaxial hybrids and dielectric-loaded strip transmission line. Data on the broad-band magic-tee used in the circulator are included. Isolator measurements down to 200 Mc are reported. Reverse-to-forward magnetic-loss ratios of 36 at 600 Mc and 12 at 300 Mc were obtained. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
