Accession Number : ADD013571

Title :   Test Configuration and Procedure for Determining the Operational Status of a Phased Array Antenna.

Descriptive Note : Patent, Filed 15 Jan 86, patented 13 Oct 87,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Zezuto, Stephen V ; Mountcastle, Paul H

Report Date : 13 Oct 1987

Pagination or Media Count : 5

Abstract : The operational status of individual phase control modules within a phased array antenna can be determined using a radio frequency oscillator. a directional coupler, a spiral antenna, an attenuator, a harmonic frequency converter, a network analyzer, and a phase magnitude display. The radio frequency oscillator generates a test radio frequency signal which is conducted into the sum port of the array by the directional coupler. The phase control modules normally phase shift radio frequency signals they receive from the sum port by amounts indicated in a command signal from the radar control system. When using this test system, the radar control system should be directed to send a test command signal which direct the phase control modules to repeatedly phase shift received radio frequency signals between a first and second phase state. The spiral antenna, when placed in proximity of each individual phase control module, receives and conducts phase shifted radio frequency signals to the harmonic analyzer. The harmonic analyzer samples and conducts the phase shifted radio frequency signals and original radio frequency signals into the network analyzer for comparison. When the first phase state is 180 deg, the display, which receives the output of the network analyzer clearly indicates if the phase control module is phase shifting the radio frequency signal in response to the test command signal.

Descriptors :   *ANTENNA ARRAYS, *CONTROL SYSTEMS, *PHASE SHIFT CIRCUITS, *PHASED ARRAYS, *RADIO SIGNALS, *SPIRAL ANTENNAS, *PATENTS, ANALYZERS, ARRAYS, COUPLERS, DIRECTIONAL, FREQUENCY, FREQUENCY CONVERTERS, HARMONICS, MODULAR CONSTRUCTION, NETWORKS, OSCILLATORS, PHASE CONTROL, PHASE SHIFT, RADIOFREQUENCY, SAMPLING, SIGNALS

Subject Categories : Active & Passive Radar Detection & Equipment
      Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE