Wideband Magnetoelastic Frequency - Selective Limiter for VHF
Final technical rept. 1 Jul-31 Dec 1968
BOEING CO SEATTLE WA
Pagination or Media Count:
In the report, the results of one years progress are summarized for the construction of a frequency-selective Limiter that uses parametric generation of subharmonic magnetoelastic modes in ferrimagnetic materials. Special attention is given to the results of tests performed during the second six months on the broadband models constructed. Based on the theory of operation and test results presented in the First Technical Report, the philosophy of broadband frequency-selective limiter circuit design is presented. The importance of pumping direction, material selection, and orientation is discussed. The material used in the final model is YIGGa, a highly doped garnet. The final orientation was made to provide a low internal saturation magnetic field to provide a low limiting threshold. Tests of the final model indicated that extremely selective limiting about 3 KHz selectivity, low intermodulation levels, and linear small signal phase response are obtainable at VHF.
- Electrical and Electronic Equipment