Patent ID: 8305282

Claim:
A radio frequency field probe comprising: a hollow stalk having first and second opposite ends, the stalk being elongated along a stalk axis; a hollow, RF-transparent housing connected to, and located adjacent, the first end of the stalk; an electronic housing connected to, and located adjacent, the second end of the stalk whereby the electronic housing is remote from the RF-transparent housing; a set of three dipoles disposed within the RF-transparent housing, each dipole having two elements extending in opposite directions along a line from a central feed point, the feed points of the three dipoles being located respectively at the centers of the bases of an equilateral triangle to which the stalk axis is perpendicular; and three elongated feedlines connected respectively to the feed points of the dipoles and extending along a direction of elongation through the hollow stalk in parallel relationship to the stalk axis; wherein: the line along which the elements of each dipole extend from the dipole's feedpoint is disposed at an angle of 54.7 degrees relative to the direction of elongation of the dipole's feedline; the line along which the elements of each dipole extend is orthogonal to an imaginary plane to which the lines along which the elements of both other dipoles extend are parallel; the elements of each dipole and the feedline connected to the feedpoint thereof are formed as thin film resistive elements on a common circuit board.