Accession Number:

AD0420385

Title:

SHIPBOARD MULTICOUPLER FEASIBILITY STUDY,

Descriptive Note:

Corporate Author:

STANFORD RESEARCH INST MENLO PARK CALIF

Personal Author(s):

Report Date:

1958-08-01

Pagination or Media Count:

41.0

Abstract:

Factors affecting the design of passive multicouplers with separately tuned branches are discussed in high-frequency applications where several transmitters and receivers must be operated simultaneously with a single antenna. A discussion is given concerning the amounts of isolation required between channels in order to avoid receiver burn-out, de-tuning effects, cross modulation, receiver desensitization, and transmitter noise interference. A four-branch multicoupler design is considered in which each branch consists of a tunable, narrow-band, minimum-loss filter containing three resonant circuits. Several numerical examples are given to illustrate the obtainable frequency coverages and channel separations in terms of the filter parameters and the permissible impedance mismatch. A description is given of an experimental four-branch multicoupler operating near 20 mc and connected between resistive sources and loads. Experimental isolations of 35 db are obtained between channels separated by 5 percent in frequency, while the channel-center losses average 1.5 db and the individual channel bandwidths are about 0.6 mc at the half power points. The effects of increasing the number of resonant circuits in each filter to four, five, or six are discussed briefly. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE