A HIGH ISOLATION ABSORPTION MODULATOR-SWITCH FOR 1.2-CM WAVELENGTH
Abstract
The design and operation is described of a K-band absorption modulator for high-speed switching or amplitude modulation of microwave power. This reciprocal ferrite modulator, designed in standard rectangular waveguide and making use of a longitudinal magnetic control field, has electrical characteristics particularly desirable in a microwave switch. These include a zero-field insertion loss of less than 1 db, a switching action (isolation) of greater than 75 db -- which is nearly independent of the magnetic control field in this state, and a matched input impedance for all values of applied field. These electrical characteristics are nearly constant over a 20-percent bandwidth. It is also possible to design this amplitude modulator for small phase shifts at the desired operating frequency. Other characteristics of the modulator include small size (3 in. max. length), magnetic control fields of less than 50 oersteds, operating temperature exceeding 100 C, and a switching- time capability of less than 0.1 microseconds.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 08, 1963
- Accession Number
- AD0414581
Entities
People
- Frank Reggia
Organizations
- Harry Diamond Laboratories