Accession Number:

AD0605180

Title:

AN AUTOMATIC IMPEDANCE MATCHER.

Descriptive Note:

Interim rept. no. 1,

Corporate Author:

ELECTROMAGNETIC RESEARCH CORP WASHINGTON D C

Personal Author(s):

Report Date:

1960-10-26

Pagination or Media Count:

8.0

Abstract:

An automatic impedance matcher has been designed to electronically tune a re-entry slot antenna to compensate for the detuning caused by the formation of the plasma sheath around the vehicle. The impedance matcher utilizes a phase-sensitive detection circuit which determines the magnitude and phase of the standing wave on the transmis sion line feeding the antenna. The output of this detector controls the voltage across a ferroelectric element whose capacitance is a function of this applied voltage. Two ferroelectric elements are used in the matcher, one in the antenna slot and one across the transmission line feeding the antenna. With this combination a VSWR of 30 or more can be adjusted electronically within milliseconds to a VSWR of 2 or less. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE