  Nitrogen-vacancy (NV) centers in diamond have been widely used as platforms
for quantum information, magnetometry and imaging of microwave (MW) fields.
High-precision spatial control of the MW field necessary to drive the
electronic spin of NV centers is essential for these applications. Here, we
report a controlled MW field distribution by excitation of a micrometer-scale
gold pattern in vicinity of the diamond surface. The gold pattern excited by a
planar ring MW antenna, acts as a receiving antenna and redistribute the MW
field in a localized area, without a direct feed of electrical current. The
planar ring MW antenna is designed to generate a uniform MW field on diamond
substrate in an area of 0.785 mm$^{2}$, providing a useful tool for detecting
the MW variations. We performed the imaging of the localized MW intensity on
the micrometer-scale gold pattern by direct observation of electron spin Rabi
oscillations, showing also the potential application of NV centers for imaging
MW field and characterization of MW devices. We achieved an enhancement of
about 19 times for the Rabi frequency on a scale of few micrometers for the
gold pattern, compared to the bulk Rabi frequency in presence of the single
planar ring MW antenna. Compared to previous methods, our method has been shown
as a fast and easy tool for the spatial control of MW fields and spin
manipulation of NV centers in diamond.
