MICROWAVE FILTERS AND COUPLING STRUCTURES
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1963
- Accession Number
- AD0404040
Entities
People
- B. M. Schiffman
- E. G. Cristal
- G. L. Matthaei
- L. A. Robinson
Organizations
- SRI International