Generation and Propagation of Hypersonic Waves and Their Applications to Microwave Frequencies.
HARRY DIAMOND LABS WASHINGTON D C
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The paper describes techniques for the generation, amplification, and propagation of elastic waves in the frequency range 1 to 3 GHz. These techniques include the design, fabrication, and evaluation of microwave acoustic delay lines consisting of highly oriented electroacoustic CdS and ZnO transducers vacuum-deposited on single-crystal sapphire Al2O3 propagating media. Typical electrical characteristics at 2 GHz of these thin-film transducers about 1 micrometer thick and delay media combination, in both 6 microsec, insertion loss less than 40 dB, input VSWR less than 2.0 over a 20-percent bandwidth, and operating temperature from -74 degrees to 96 degrees C. These fixed, passive microwave acoustic delay lines MADL are very reliable and are small, lightweight, and relatively inexpensive to fabricate. Acoustic propagation velocity, power handling capabilities, impedance matching techniques, and applications of these electroacoustic delay lines are also discussed. Author
- Electrical and Electronic Equipment
- Solid State Physics