Effect of Multiple Receiving Antennas on the Response of an R.F. Intrusion Sensor
Abstract
A phenomenological theory was developed to analyze the response of an RF intrusion detection system. The system consisted of a loop of leaky coax cable which acted as a distributed transmitting antenna and one or more receiving monopoles located inside the loop. The variation in received signal power was computed for two system configurations. The first used a single arbitrarily located receiving antenna; the second used two receiving antennas. The results showed an increase in system response in the sector where the receiving antenna was nearest the leaky coax cable. It was also shown that the local phase constant which controls the period of the interference pattern varies as the position of the intruder changes. The same characteristics were present in the response of a two antenna system. However, the amplitude of the variation varied over a wider range because of the interference between the two received intruder signals. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1979
- Accession Number
- ADA072819
Entities
People
- J. L. Poirier