Amplifier Research Corporation

Jerome Choder

Jason Galluppi

George Barth

Radio frequency field probe

An E-field probe comprises one or more dipoles, each comprising plural, parallel, strings of discrete resistors mounted on a section of printed circuit board and connected electrically so that the parallel strings are twisted about each other for optimum orientation symmetry and minimum stray field pick-up. The values of the individual resistors are chosen so that the dipole is essentially a tapered resistance dipole, providing good performance over a very broad range of frequencies. A pair of diodes connected respectively in parallel strings of one arm of the dipole allows the feeder to be constituted by a pair of parallel series of resistors of comparatively high resistance value continuing from the outer end of the arm in which the diodes are situated. The dipole is effectively &ldquo;end fed&rdquo; rather then center fed, and pattern distortion and axial asymmetry are minimized.

Growing community of inventors

Huntington Valley, PA, United States of America

Jerome Choder