Importance

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Abstract

A radio frequency antenna having a pair of conductors disposed over a ground plane conductor. First ends of the pair of electrical conductors are coupled to a detector means, a second end of one of the pair of conductors is electrically connected to the ground plane conductor and a second end of the other one of the pair of conductors is adapted to carry video frequency signals. In a preferred embodiment of the invention the pair of conductors is configured to spiral inwardly from an outer region of the antenna to an inner region of the antenna. The ends of the conductors disposed proximate the inner region of the antenna are coupled to a detector means. The ground plane conductor has a cavity disposed beneath the inner region of the antenna. The cavity is conically shaped and the detector means is directly bonded to the ends of the pair of conductors disposed proximate the inner region of the antenna. With such arrangement an inward traveling electromagnetic wave received by the spiral antenna is detected by the diode means and converted into a video frequency signal without the requirement of a balun. The detected video signal is coupled from the antenna at the outer end of the nongrounded one of the spiral conductors to a video amplifier. The outer end of the other one of the spiral windings is grounded to the ground plane conductor to provide a D.C. return for the video signal.

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First Claim