Accession Number : ADA314835

Title :   Design and Testing of an Interference Modulator for DEW Applications.

Descriptive Note : Final rept. Feb 95-Feb 96,

Corporate Author : ARMY RESEARCH LAB ADELPHI MD

Personal Author(s) : Abe, David K. ; Mark, Andrea K. ; Bromborsky, Alan ; Lazzard, Carl J. ; Del Rosario, Romeo

PDF Url : ADA314835

Report Date : SEP 1996

Pagination or Media Count : 60

Abstract : The interference modulator (IM) is a microwave source concept that can produce a broadband, amplitude modulated radio frequency (rf) waveform with independently tunable carrier and modulation frequencies. In its simplest form, the IM is a two-channel device that can produce an amplitude modulated signal at 50-percent duty by either generating and beating two electromagnetic waves together in the far field or by combining the two signals with a four-port hybrid network. With additional channels, an IM can be made to synthesize more complex waveforms and duty factors. A general methodology for the design of an n-channel (n > 2) IM is developed. As a validation of the design methodology, a two-channel prototype lM was constructed. The design, fabrication, and testing of the two-channel prototype are described in detail. Experiments carried out with the prototype IM have successfully demonstrated the IM concept, producing a source with a modulation envelope that is continuously tunable over four decades (from 100 Hz to 1 MHz), with a carrier frequency that is continuously tunable from 800 MHz to 2 GHz.

Descriptors :   *FREQUENCY MODULATION, *RADIO TRANSMITTERS, *SINGLE SIDEBAND COMMUNICATIONS, NETWORKS, BROADBAND, TUNING, HYBRID SYSTEMS, RADIOFREQUENCY INTERFERENCE, DUAL CHANNEL, CARRIER FREQUENCIES.

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE