348330-1- F Radiation Laboratory Electrical and Computer Engineering Department The University of Michigan Ann Arbor, Michigan 48104 EFFECT OF AN INTRUDER ON A SECURITY SYSTEM by Thomas B. A. Senior Prepared for Omni Spectra, Inc. 24600 Hallwood Court Farmington, Michigan 48024 July 1975 348330-1-F = RL-2533

-2 - Table I Scattering Cross Section of Triangular Corner Reflectors at 8.0 GHz Corner Reflector Dimension Number (inches) Al 27.0 A2 48.0 A3 48.0 A4 46.0 A5 46.0 A6 46.0 A7 46.0 A8 63.0 A9 83.5 A10 84.0 Cross Section Theoretical (aT) Measured (aM) (dBm2) (dBm2) 28.19 28.4 38.18 37.4 38.18 37.4 37.44 37.2 37.44 36.4 37.44 36.4 37.44 36.5 42.97 44.4 47.80 49.4 47.90 48.4

-3-.3 m antenna 1.5 m antenna Fig. 1. The new short pulse system.

-4 - Fig. 2. Triangular corner reflector.

-5 -1150 Fig. 3. Corner reflector Al; A = 27", attenuator setting = 18 dB, frequency = 8.0 GHz, polarization = horizontal, a = 28.4 dBm2. m

- 6J -0o l ol Fig. 4. Corner reflector A2; A = 48", attentuator setting = 18 dB, frequency = 8.0 GHz, polarization = horizontal, a = 37.4 dBm2. m

-7 -_ ( -: 180~ Fig. 5. Corner reflector A3; A = 48", attenuator setting = 18 dB, frequency = 8.0 GHz, polarization = horizontal, a = 37.4 dBm2. m

-8 - = 0~ ___ 180~ Fig. 6. Corner reflector A4; A = 46", attenuator setting = 18 dB, frequency = 8.0 GHz, polarization = horizontal, = 37.2 dBm2.

-9 -- -- o - 18 30 Fig. 7. Corner reflector A5; A = 46", attenuator setting = 18 dB, frequency = 8.0 GHz, polarization = horizontal, C = 36.4 dBm2. m

-10-:0 215 ___ Fig. 8. Corner reflector A6; A = 46", attenuator setting = 18 dB, frequency = 8.0 GHz, polarization = horizontal, a = 36.4 dBm2. m

-11 -= 00 _ _ 180~ Fig. 9. Corner reflector A7; A = 46", attenuator setting = 18 dB, frequency = 8.0 GHz, polarization = horizontal, a = 36.5 dBm2. m

- I L ___: 1 30~ 4-1 Fig. 10. Corner reflector A8; A = 63", attenuator setting = 33 dB, frequency = 8.0 GHz, polarization = horizontal, m = 44.4 dBm2. m

-13 --= o0.__ - 180~ Fig. 11. Corner reflector A9; frequency = 8.0 GHz, a = 49.4 dBm2. m A = 83.5", attenuator setting = 33 dB, polarization = horizontal,

-14 -- 10~ Fig. 12 Corner reflector AlO; A = 84", attenuator setting = 33 dB, frequency = 8.0 GHz, polarization = horizontal, am = 48.4 dBm2. a m 48. dx

-15 -180~ Fig. 13. Precision corner reflector; A = 20.5", attenuator setting = 18 dB, frequency = 8.0 GHz, polarization = horizontal, aT = 23.4 dBm2.

-16 -= 0 _ 180~ Fig. 14 System linearity check; 2 dB increments, frequency = 8 GHz, polarization = horizontal.