RF coupler for measuring RF parameters in the near-field

Details RF coupler for measuring RF parameters in the near-field RF coupler for measuring RF parameters in the near-field

1991-10-16

1994-01-11

Hajec, Donald

Communications: radio wave antennas

Antennas

Measuring signal energy

343705, G01R 2908

Patent

active

052785718

ABSTRACT:
An RF coupler is used to measure transmitted power and receiver sensitivity of an avionics RF transceiving system (e.g., a secondary radar transponder). The coupler physically mates with (e.g., by conformally enveloping) an airborne type blade antenna mounted to the fuselage of an aircraft. The construction and theory of operation of such a coupling device for coupling RF energy into an antenna is disclosed. The coupling device provides receiver sensitivity measurements and produces rectified pulses or DC levels for the purpose of measuring transmitter power. The system measures such parameters in the extreme near-field (e.g., about 0.1 wavelength) to simplify the measurements and to isolate the measurements from errors due to standing waves and the presence of other nearby objects.

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