Apparatus and method for determining the aperture illumination o

Details Apparatus and method for determining the aperture illumination o Apparatus and method for determining the aperture illumination o

1993-08-23

1994-08-09

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including antenna pattern plotting

342173, H01Q 300

Patent

active

053370597

ABSTRACT:
An apparatus and method are disclosed for determining an aperture illumination of a phased-array antenna. The apparatus and method evaluate a monitor signal obtained from a first output (A1) of a monitor waveguide (MH). The apparatus and method are also suited for antennas having a very restricted scan angle coverage, such as elevation antennas in MLS systems. To obtain information from a portion of the monitor signal corresponding to at least one cycle of the far-field pattern of the antenna, portions of the monitor signal which are visible at different monitor angles are combined for evaluation. This is accomplished by also evaluating signals obtained from a second output (A2) of the monitor waveguide which is spatially separated from the first output (A1), or from outputs of additional monitor waveguides, at different monitor angles.

REFERENCES:
patent: 4453164 (1984-06-01), Patton
patent: 4536766 (1985-08-01), Frazita
patent: 4926186 (1990-05-01), Kelly et al.
patent: 5187486 (1993-02-01), Kolzer
J. R. Sebring and J. K. Ruth, "MLS Scanning-Beam Antenna Implementation", Jan. 1974, pp. 41-44 and 46, Microwave Journal.
Jacob Ronen and Richard H. Clarke, "Monitoring Techniques for Phased-Array Antennas", Dec. 1985, pp. 1313-1327, IEEE Transactions on Antennas and Propagation, vol. AP-33, No. 12.

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