  Detecting microwave signals over a wide frequency range has numerous
advantages as it enables simultaneous transmission of a large amount of
information and access to more spectrum resources. This capability is crucial
for applications such as microwave communication, remote sensing, and radar.
However, conventional microwave receiving systems are limited by amplifiers and
band-pass filters that can only operate efficiently in a specific frequency
range. Typically, these systems can only process signals within a three-fold
frequency range, which limits the data transfer bandwidth of the microwave
communication systems. Developing novel atom-integrated microwave sensors, for
example, radio frequency (RF)-chip coupled Rydberg atomic receiver, provides
opportunities for a large working bandwidth of microwave sensing at the atomic
level. Here, an ultra-wide dual-band RF sensing scheme is demonstrated by
space-division multiplexing two RF-chip-integrated atomic receiver modules. The
system can simultaneously receive dual-band microwave signals that span a
frequency range exceeding 6 octaves (300 MHz and 24 GHz). This work paves the
way for multi-band microwave reception applications within an ultra-wide range
by RF-chip-integrated Rydberg atomic sensor.
