| Design and Fabrication of Reflective Array Type Wideband SAW Dispersive Delay Line |
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Jun-Ho Choi, Jong-Won Yang, Sun-Phil Nah, Won Jang |
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Agency for Defense Development |
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| Abstract |
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A reflective array type surface acoustic wave(SAW) dispersive delay line(DDL) with high time-bandwidth at the V/UHF-band is designed and fabricated for compressive receiver applications. This type of the SAW DDL has the properties of the relative bandwidth of 20 %, the time delay of 49.89 usec, the insertion loss of 38.5 dB and the side lobe rejection of 39 dB. In comparison with a commercial SAW DDL, the insertion loss, amplitude ripple and side lobe rejection are improved by $1.5dB{pm}0.6dB$ and 4 dB respectively. Using the fabricated SAW DDL, the prototype of the compressive receiver is developed. It is composed of RF converter, fast tunable LO, chirp LO, A/D converter, signal processing unit and control unit. This prototype system shows a fine frequency resolution of below 30 kHz with high scan rate. |
| Key words:
Surface Acoustic Wave(SAW), Dispersive Delay Line(DDL), Electronic Warfare(EW), Multiply-Convolve-Multiply(M-C-M), Compressive Receiver |
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