Active antenna near field calibration method

Details Active antenna near field calibration method Active antenna near field calibration method

1993-09-30

1995-12-19

Blum, Theodore M.

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

Directive

Including antenna pattern plotting

342173, 342174, H01Q 300

Patent

active

054772290

ABSTRACT:
In a method of calibrating an active antenna the active elements of a transfer function matrix are measured using a near field probe for each radiating source of the antenna. The probe is placed in front of each source in succession and each source is excited in turn with the opposite phase and with all the other sources of the array excited normally. In the case of linear superposition of radiated fields, the measurements obtained by this method yield the elements of the transfer function matrix directly. This allows for phase and amplitude errors due to the components of the active antenna and for the effects of coupling between adjacent sources which modify the theoretical characteristics of the antenna. In the non-linear case the measurements are repeated and the matrix is obtained by iteration based on a comparison of the theoretical values used to control the antenna and the measured fields actually obtained. Measurements carried out on individual active modules prior to assembly of the antenna can be used in one variant of the method.

REFERENCES:
patent: 4926186 (1990-05-01), Kelly et al.
patent: 5038146 (1991-08-01), Troychak et al.
patent: 5072228 (1991-12-01), Kuwahara
patent: 5241316 (1993-08-01), Pringle
patent: 5248982 (1993-09-01), Reinhardt et al.
Japanese Patent Abstract JP60089766 dated May 20, 1985.
David N. McQuiddy, Jr. et al., "Transmit/Recieve Module Technology . . . Radar", Proceedings of the IEEE, vol. 79, No. 3, Mar. 1991, pp. 308-341.
French Search Report 9212092 dated Jun. 18, 1993.

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