Accession Number:

AD0489426

Title:

COMMUNICATIONS APPLICATIONS OF CRYOGENIC TECHNIQUES - THE CRYOGENIC DIPLEXER.

Descriptive Note:

Final rept. Mar 65-Apr 66,

Corporate Author:

RADIO CORP OF AMERICA NEW YORK COMMUNICATIONS SYSTEMS DIV

Personal Author(s):

• Bossard, B.
• Markard, E.
• Perlman, B.
• Torrione, P.
• Becker, L.

Report Date:

1966-07-01

Pagination or Media Count:

71.0

Abstract:

Theory has been reviewed and formulated in which the resonator Q can be determined as a function of cavity temperature. It can be shown that an X-band superconducting filter can be realized with an unloaded Q of 1 million at a temperature of 4.2 K. By cooling the filter to a superfluid state of 2 K, the unloaded Q increases to 1 billion. These high-Q results imply that a 100-kilowatt transmitter can be located in frequency 50 kHz away from a receiver at 10 Gcs without producing any discernible cross or intermodulation products. This report also contains a materials study of various superconducting elements such as niobium tin, and lead. Also, the power-handling capability of a superconductor is discussed in great detail. A special task of this program was devoted to an investigation of the refrigeration cooling capacity of closed-cycle units for the various filter applications. The results of this program clearly indicate that a superconducting filter at microwave frequencies can handle vast amounts of power and give better selectivity than that commonly obtained in superheterodyne receivers.

Descriptors:

• *DUPLEXERS
• *CAVITY RESONATORS
• CRYOGENICS
• SUPERCONDUCTIVITY
• COMMUNICATION AND RADIO SYSTEMS
• X BAND
• NIOBIUM
• TIN
• LEAD(METAL)
• RADIOFREQUENCY POWER

Subject Categories:

• Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE