  Dissipative solitons rely on the double balance between nonlinearity and
dispersion as well as gain and loss have attracted a lot of attention in
optics, since it gives rise to ultrashort pulses and broadband frequency combs
with good stability and smooth spectral envelopes. Here we observe a novel
dissipative solitons in microwave photonics that gives rise to wideband tunable
frequency hopping microwave signals with fast frequency switching speed. The
dissipative microwave photonic solitions are achieved through the double
balance between nonlinear gain saturation and linear filtering as well as gain
and loss in a microwave photonic resonant cavity. The generation of dissipative
solitons with different pulse width, repletion rate and number of solitons per
round-trip time are observed, together with the corresponding wideband tunable
frequency hopping microwave signals. This work opens new avenues for signal
generation, processing and control based on the principle of solitons in
microwave photonics, and has great potential in many applications such as
modern radars, electronic warfare systems, and telecommunications.
