Design and Testing of an Interference Modulator for DEW Applications.
Final rept. Feb 95-Feb 96,
ARMY RESEARCH LAB ADELPHI MD
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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.
- Radio Communications