An electromagnetic field sensor or generator employing a radio frequency
microstrip transmission channel formed by a low-loss dielectric substrate
sandwiched between a non-resonant microstrip conductor. A discontinuity
in said microstrip conductor that substantially alters its
cross-sectional dimensions causes electrical signals in the microstrip
conductor to be inductively coupled to near field electromagnetic
radiation in the vicinity of the discontinuity. The discontinuity may be
defined by one or more holes, slots, slits or stubs in the microstrip.
The sensor/generator may be used in numerous applications, including NMR
spectrometry, as a near field scanning device to inspect operating
integrated circuits, or to read or write data on magnetic materials.
