WIDE BAND ELECTRONICALLY TUNABLE FILTERS.

The purpose of this work is to conduct research and development to advance the state-of-theart in the field of wide band electronically tunable filters employing magnetically tunable resonators such as Yttrium Iron Garnet YIG. The work is to culminate in the development of a series of bandpass filters covering the frequency range 1-18 Gc, a series of band-reject filters covering the frequency range 1-12 Gc, a multiple band-reject filter with four independently tunable reject bands in the frequency range 2-4 Gc, and a power supply capable of sweeping any of the filters through its entire tuning band, linearly, at a rate which can be varied continuously from 0 manual sweep to 1000 cps. The frequency range covered by the bandpass filters will be divided as follows 1-2, 2-4, 4-8, 8-12 and 12-18 Gc, with 18-30 Mc bandwidth in the passband. The frequency range covered by the band-reject filters will be divided as follows 1-2, 2-4, 4-8, 8-12 Gc with a 50 db rejection bandwidth of greater than 3 Mc and a 3 db bandwidth of less than 30 Mc. All the filters are to be nonreciprocal greater than 20db, temperature compensated, magnetically shielded, and ruggedized. Author