Dual Port Antenna Combining Sensing and Communication Tasks for Cognitive Radio

Hamza Nachouane, Abdellah Najid, Abdelwahed Tribak, Fatima Riouch

Abstract


Dynamic spectrum access has been proposed as
the effective solution to overcome the spectrum scarcity issue,
supported by cognitive radio technology. Sensing and communication
functions are both the most important tasks in cognitive
radio systems. In this paper, an antenna system combining
sensing and communication tasks is proposed to be integrated
into cognitive radio front-ends. Sensing task is performed by
the means of an ultra-wideband quasi-omnidirectional antenna.
Whilst the communication task is ensured by using a narrowband
antenna. Both antennas have been designed on the same layer of
a FR4 substrate, for manufacturing cost constraint. Therefore,
the isolation between them must take into consideration. The
measured mutual coupling of less than -18dB is achieved over
the whole impedance bandwidth. The proposed sensing antenna
covers a wide range frequency bands ranging from 2 to 5.5GHz.
While the communication antenna operates at 2.8GHz, and by
adding inductors to the antenna, the resonant frequency can
be tuned from 2.6 to 2.7GHz. The whole antenna system was
designed, fabricated, and tested. Measurement and simulation
results prove the feasibility of the proposed structure for cognitive
radio applications.

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References


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