Miniature antenna enables robotic teaming in complex environments

Date:
September 1, 2020
Source:
U.S. Army Research Laboratory
Summary:
A new, miniature, low-frequency antenna with enhanced bandwidth
will enable robust networking among compact, mobile robots in
complex environments.



FULL STORY ==========================================================================
A new, miniature, low-frequency antenna with enhanced bandwidth will
enable robust networking among compact, mobile robots in complex
environments.


==========================================================================
In a collaborative effort between the U.S. Army Combat Capabilities
Development Command's Army Research Laboratory and the University of
Michigan, researchers developed a novel design approach that improves
upon limitations of conventional antennas operating at low frequencies -- demonstrating smaller antennas that maintain performance.

Impedance matching is a key aspect of antenna design, ensuring that
the radio transmits power through the antenna with minimal reflections
while in transmit mode -- and that when the antenna is in receive mode,
it captures power to efficiently couple to the radio over all frequencies within the operational bandwidth.

"Conventional impedance matching techniques with passive components --
such as resistors, inductors and capacitors -- have a fundamental limit,
known as the Chu-Wheeler limit, which defines a bound for the maximum achievable bandwidth- efficiency product for a given antenna size," said
Army researcher Dr. Fikadu Dagefu. "In general, low-frequency antennas
are physically large, or their miniaturized counterparts have very
limited bandwidth and efficiency, resulting in higher power requirement."
With those challenges in mind, the researchers developed a novel approach
that improves bandwidth and efficiency without increasing size or changing
the topology of the antenna.

"The proposed impedance matching approach applies a modular active circuit
to a highly miniaturized, efficient, lightweight antenna -- overcoming
the aforementioned Chu-Wheeler performance limit," said Army postdoctoral researcher Dr. Jihun Choi. "This miniature, actively matched antenna
enables the integration of power-efficient, low-frequency radio systems
on compact mobile agents such as unmanned ground and aerial vehicles."
The researchers said this approach could create new opportunities for networking in the Army.



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The ability to integrate low-frequency radio systems with low size,
weight, and power -- or SWAP -- opens the door for the exploitation
of this underutilized and underexplored frequency band as part of the heterogeneous autonomous networking paradigm. In this paradigm, agents
equipped with complementary communications modalities must adapt their approaches based on challenges in the environment for that specific
mission. Specifically, the lower frequencies are suitable for reliable communications in complex propagation environments and terrain due to
their improved penetration and reduced multipath.

"We integrated the developed antenna on small, unmanned ground vehicles
and demonstrated reliable, real-time digital video streaming between
UGVs, which has not been done before with such compact low-frequency
radio systems," Dagefu said. "By exploiting this technology, the robotic
agents could coordinate and form teams, enabling unique capabilities
such as distributed on-demand beamforming for directional and secure battlefield networking." With more than 80 percent of the world's
population expected to live in dense urban environments by 2050,
innovative Army networking capabilities are necessary to create and
maintain transformational overmatch, the researchers said. Lack of
fixed infrastructure coupled with the increasing need for a competitive advantage over near-peer adversaries imposes further challenges on Army networks, a top modernization priority for multi-domain operations.

While previous experimental studies demonstrated bandwidth enhancement
with active matching applied to a small non-resonant antenna (e.g., a
short metallic wire), no previous work simultaneously ensures bandwidth
and radiation efficiency enhancement compared to small, resonant antennas
with performance near the Chu-Wheeler limit.

The Army-led active matching design approach addresses these key
challenges stemming from the trade-off among bandwidth, efficiency and stability. The researchers built a 15-centimeter prototype (2 percent of
the operating wavelength) and demonstrated that the new design achieves
more than threefold bandwidth enhancement compared to the same antenna
without applying active matching, while also improving the transmission efficiency 10 times compared to the state-of-the-art actively matched
antennas with the same size.

"In the design, a highly accurate model captures sharp impedance variation
of the highly miniaturized resonant antenna" Choi said. "Based on the
model, we develop an active matching circuit that enhances bandwidth and efficiency simultaneously while ensuring the circuit is fully stable."
The team published their research, A Miniature Actively Matched Antenna
for Power-Efficient and Bandwidth-Enhanced Operation at Low VHF, authored
by Drs.

Jihun Choi, Fikadu Dagefu, Brian Sadler, and Prof. Kamal Sarabandi,
in the peer-reviewed journal Institute of Electrical and Electronics
Engineers Transactions on Antennas and Propagation.

"This technology is ripe for future development and transition to our
various partners within the Army," Dagefu said. "We are optimistic that
with the integration of aspects of our heterogeneous networking research,
this technology will further develop and will be integrated into future
Army communications systems."

========================================================================== Story Source: Materials provided by U.S._Army_Research_Laboratory. Note: Content may be edited for style and length.


========================================================================== Journal Reference:
1. Jihun Choi, Fikadu T. Dagefu, Brian M. Sadler, Kamal Sarabandi. A
Miniature Actively Matched Antenna for Power-Efficient and
Bandwidth- Enhanced Operation at Low VHF. IEEE Transactions on
Antennas and Propagation, 2020; 1 DOI: 10.1109/TAP.2020.3004990 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/09/200901120741.htm

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