MICROWAVE FILTERS AND COUPLING STRUCTURES
Final rept. 1 Jan 1961-31 Dec 1962
STANFORD RESEARCH INST MENLO PARK CA
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The work of the two-year course of this contract is summarized. A two-resonator-waveguide, magnetically-tunable filter and a two-resonator, strip-line, magnetically-tunable filter are de scribed. These filters utilize ferrimagnetic resonance in single-crystal yttrium-iron-garnet YIG to achieve tuning which is controlled by a biasing dc magnetic field. The waveguide filter is for X-band and uses a novel coupling structure which increases the coupling between the external circuit and the YIG resonators. This makes it possible to use unusually small resonators 0.025-inch diameter, which helps to reduce spurious response activity in the stop bands. The strip-line filter is for S- band. The exact design of band-stop filters is extended to cover additional strip-line or coaxial configurations which have practical advantages. These include a configuration where the resonator lines are parallel to, but separate from, the main transmission line, and a configuration where the resonators are parallel to the main transmission line and attached to it. The first form is advantageous for narrow-stop-band filters, while the latter form is advantageous for wide-stop-band filters.
- Electrical and Electronic Equipment